From 679e90b1578acf61cf720057898059ce90ec0b2c Mon Sep 17 00:00:00 2001 From: Josh Coalson Date: Fri, 9 Nov 2001 19:23:42 +0000 Subject: [PATCH] change back to unix-format line endings --- src/libFLAC/file_decoder.c | 946 +++++++++++----------- src/libFLAC/seekable_stream_decoder.c | 1432 ++++++++++++++++----------------- 2 files changed, 1189 insertions(+), 1189 deletions(-) diff --git a/src/libFLAC/file_decoder.c b/src/libFLAC/file_decoder.c index e0cf07e..194dcd4 100644 --- a/src/libFLAC/file_decoder.c +++ b/src/libFLAC/file_decoder.c @@ -1,473 +1,473 @@ -/* libFLAC - Free Lossless Audio Codec library - * Copyright (C) 2000,2001 Josh Coalson - * - * This library is free software; you can redistribute it and/or - * modify it under the terms of the GNU Library General Public - * License as published by the Free Software Foundation; either - * version 2 of the License, or (at your option) any later version. - * - * This library is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Library General Public License for more details. - * - * You should have received a copy of the GNU Library General Public - * License along with this library; if not, write to the - * Free Software Foundation, Inc., 59 Temple Place - Suite 330, - * Boston, MA 02111-1307, USA. - */ - -#include -#include /* for malloc() */ -#include /* for strcmp() */ -#include /* for stat() */ -#include "FLAC/assert.h" -#include "protected/file_decoder.h" -#include "protected/seekable_stream_decoder.h" -#include "private/md5.h" - -/*********************************************************************** - * - * Private class method prototypes - * - ***********************************************************************/ - -static FLAC__SeekableStreamDecoderReadStatus read_callback_(const FLAC__SeekableStreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data); -static FLAC__SeekableStreamDecoderSeekStatus seek_callback_(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data); -static FLAC__SeekableStreamDecoderTellStatus tell_callback_(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data); -static FLAC__SeekableStreamDecoderLengthStatus length_callback_(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data); -static FLAC__bool eof_callback_(const FLAC__SeekableStreamDecoder *decoder, void *client_data); -static FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__SeekableStreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 *buffer[], void *client_data); -static void metadata_callback_(const FLAC__SeekableStreamDecoder *decoder, const FLAC__StreamMetaData *metadata, void *client_data); -static void error_callback_(const FLAC__SeekableStreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data); - -/*********************************************************************** - * - * Private class data - * - ***********************************************************************/ - -typedef struct FLAC__FileDecoderPrivate { - FLAC__StreamDecoderWriteStatus (*write_callback)(const FLAC__FileDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 *buffer[], void *client_data); - void (*metadata_callback)(const FLAC__FileDecoder *decoder, const FLAC__StreamMetaData *metadata, void *client_data); - void (*error_callback)(const FLAC__FileDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data); - void *client_data; - FILE *file; - char *filename; /* == NULL if stdin */ - FLAC__SeekableStreamDecoder *seekable_stream_decoder; - struct { - FLAC__bool md5_checking; - } init_values_for_superclass; -} FLAC__FileDecoderPrivate; - -/*********************************************************************** - * - * Public static class data - * - ***********************************************************************/ - -const char *FLAC__FileDecoderStateString[] = { - "FLAC__FILE_DECODER_OK", - "FLAC__FILE_DECODER_SEEKING", - "FLAC__FILE_DECODER_END_OF_FILE", - "FLAC__FILE_DECODER_ERROR_OPENING_FILE", - "FLAC__FILE_DECODER_MEMORY_ALLOCATION_ERROR", - "FLAC__FILE_DECODER_SEEK_ERROR", - "FLAC__FILE_DECODER_STREAM_ERROR", - "FLAC__FILE_DECODER_STREAM_DECODER_ERROR", - "FLAC__FILE_DECODER_ALREADY_INITIALIZED", - "FLAC__FILE_DECODER_INVALID_CALLBACK", - "FLAC__FILE_DECODER_UNINITIALIZED" -}; - -/*********************************************************************** - * - * Class constructor/destructor - * - ***********************************************************************/ - -FLAC__FileDecoder *FLAC__file_decoder_new() -{ - FLAC__FileDecoder *decoder; - - FLAC__ASSERT(sizeof(int) >= 4); /* we want to die right away if this is not true */ - - decoder = (FLAC__FileDecoder*)malloc(sizeof(FLAC__FileDecoder)); - if(decoder == 0) { - return 0; - } - decoder->protected_ = (FLAC__FileDecoderProtected*)malloc(sizeof(FLAC__FileDecoderProtected)); - if(decoder->protected_ == 0) { - free(decoder); - return 0; - } - decoder->private_ = (FLAC__FileDecoderPrivate*)malloc(sizeof(FLAC__FileDecoderPrivate)); - if(decoder->private_ == 0) { - free(decoder->protected_); - free(decoder); - return 0; - } - - decoder->protected_->state = FLAC__FILE_DECODER_UNINITIALIZED; - - decoder->private_->filename = 0; - decoder->private_->write_callback = 0; - decoder->private_->metadata_callback = 0; - decoder->private_->error_callback = 0; - decoder->private_->client_data = 0; - decoder->private_->init_values_for_superclass.md5_checking = false; - - return decoder; -} - -void FLAC__file_decoder_delete(FLAC__FileDecoder *decoder) -{ - FLAC__ASSERT(decoder != 0); - FLAC__ASSERT(decoder->protected_ != 0); - FLAC__ASSERT(decoder->private_ != 0); - - free(decoder->private_); - free(decoder->protected_); - free(decoder); -} - -/*********************************************************************** - * - * Public class methods - * - ***********************************************************************/ - -FLAC__FileDecoderState FLAC__file_decoder_init(FLAC__FileDecoder *decoder) -{ - FLAC__ASSERT(decoder != 0); - - if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED) - return decoder->protected_->state = FLAC__FILE_DECODER_ALREADY_INITIALIZED; - - decoder->protected_->state = FLAC__FILE_DECODER_OK; - - if(0 == decoder->private_->write_callback || 0 == decoder->private_->metadata_callback || 0 == decoder->private_->error_callback) - return decoder->protected_->state = FLAC__FILE_DECODER_INVALID_CALLBACK; - - decoder->private_->file = 0; - decoder->private_->seekable_stream_decoder = 0; - - if(0 == decoder->private_->filename) - decoder->private_->file = stdin; - else - decoder->private_->file = fopen(decoder->private_->filename, "rb"); - - if(decoder->private_->file == 0) - return decoder->protected_->state = FLAC__FILE_DECODER_ERROR_OPENING_FILE; - - decoder->private_->seekable_stream_decoder = FLAC__seekable_stream_decoder_new(); - - if(0 == decoder->private_->seekable_stream_decoder) - return decoder->protected_->state = FLAC__FILE_DECODER_MEMORY_ALLOCATION_ERROR; - - FLAC__seekable_stream_decoder_set_read_callback(decoder->private_->seekable_stream_decoder, read_callback_); - FLAC__seekable_stream_decoder_set_seek_callback(decoder->private_->seekable_stream_decoder, seek_callback_); - FLAC__seekable_stream_decoder_set_tell_callback(decoder->private_->seekable_stream_decoder, tell_callback_); - FLAC__seekable_stream_decoder_set_length_callback(decoder->private_->seekable_stream_decoder, length_callback_); - FLAC__seekable_stream_decoder_set_eof_callback(decoder->private_->seekable_stream_decoder, eof_callback_); - FLAC__seekable_stream_decoder_set_write_callback(decoder->private_->seekable_stream_decoder, write_callback_); - FLAC__seekable_stream_decoder_set_metadata_callback(decoder->private_->seekable_stream_decoder, metadata_callback_); - FLAC__seekable_stream_decoder_set_error_callback(decoder->private_->seekable_stream_decoder, error_callback_); - FLAC__seekable_stream_decoder_set_client_data(decoder->private_->seekable_stream_decoder, decoder); - - /* - * Unfortunately, because of the "_new() ... _set_() ... _init()" order of - * decoder initialization, settings that are 'inherited' from the superclass - * have to be passed up this way, because the superclass has not even been - * created yet when the value is set in the subclass. - */ - (void)FLAC__seekable_stream_decoder_set_md5_checking(decoder->private_->seekable_stream_decoder, decoder->private_->init_values_for_superclass.md5_checking); - - if(FLAC__seekable_stream_decoder_init(decoder->private_->seekable_stream_decoder) != FLAC__SEEKABLE_STREAM_DECODER_OK) - return decoder->protected_->state = FLAC__FILE_DECODER_STREAM_DECODER_ERROR; /*@@@ change this to FLAC__FILE_DECODER_SEEKABLE_STREAM_ERROR in next minor-revision */ - - return decoder->protected_->state; -} - -FLAC__bool FLAC__file_decoder_finish(FLAC__FileDecoder *decoder) -{ - FLAC__bool ok = true; - - FLAC__ASSERT(decoder != 0); - if(decoder->protected_->state == FLAC__FILE_DECODER_UNINITIALIZED) - return true; - if(decoder->private_->file != 0 && decoder->private_->file != stdin) - fclose(decoder->private_->file); - if(0 != decoder->private_->filename) - free(decoder->private_->filename); - if(decoder->private_->seekable_stream_decoder != 0) { - ok = FLAC__seekable_stream_decoder_finish(decoder->private_->seekable_stream_decoder); - FLAC__seekable_stream_decoder_delete(decoder->private_->seekable_stream_decoder); - } - decoder->protected_->state = FLAC__FILE_DECODER_UNINITIALIZED; - return ok; -} - -FLAC__bool FLAC__file_decoder_set_md5_checking(const FLAC__FileDecoder *decoder, FLAC__bool value) -{ - if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED) - return false; - decoder->private_->init_values_for_superclass.md5_checking = value; - return true; -} - -FLAC__bool FLAC__file_decoder_set_filename(const FLAC__FileDecoder *decoder, const char *value) -{ - FLAC__ASSERT(value != 0); - if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED) - return false; - if(0 != decoder->private_->filename) - free(decoder->private_->filename); - if(0 == strcmp(value, "-")) { - decoder->private_->filename = 0; - } - else { - if(0 == (decoder->private_->filename = (char*)malloc(strlen(value)+1))) { - decoder->protected_->state = FLAC__FILE_DECODER_MEMORY_ALLOCATION_ERROR; - return false; - } - strcpy(decoder->private_->filename, value); - } - return true; -} - -FLAC__bool FLAC__file_decoder_set_write_callback(const FLAC__FileDecoder *decoder, FLAC__StreamDecoderWriteStatus (*value)(const FLAC__FileDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 *buffer[], void *client_data)) -{ - if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED) - return false; - decoder->private_->write_callback = value; - return true; -} - -FLAC__bool FLAC__file_decoder_set_metadata_callback(const FLAC__FileDecoder *decoder, void (*value)(const FLAC__FileDecoder *decoder, const FLAC__StreamMetaData *metadata, void *client_data)) -{ - if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED) - return false; - decoder->private_->metadata_callback = value; - return true; -} - -FLAC__bool FLAC__file_decoder_set_error_callback(const FLAC__FileDecoder *decoder, void (*value)(const FLAC__FileDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)) -{ - if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED) - return false; - decoder->private_->error_callback = value; - return true; -} - -FLAC__bool FLAC__file_decoder_set_client_data(const FLAC__FileDecoder *decoder, void *value) -{ - if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED) - return false; - decoder->private_->client_data = value; - return true; -} - -FLAC__FileDecoderState FLAC__file_decoder_get_state(const FLAC__FileDecoder *decoder) -{ - return decoder->protected_->state; -} - -FLAC__bool FLAC__file_decoder_get_md5_checking(const FLAC__FileDecoder *decoder) -{ - return FLAC__seekable_stream_decoder_get_md5_checking(decoder->private_->seekable_stream_decoder); -} - -FLAC__bool FLAC__file_decoder_process_whole_file(FLAC__FileDecoder *decoder) -{ - FLAC__bool ret; - FLAC__ASSERT(decoder != 0); - - if(decoder->private_->seekable_stream_decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM) - decoder->protected_->state = FLAC__FILE_DECODER_END_OF_FILE; - - if(decoder->protected_->state == FLAC__FILE_DECODER_END_OF_FILE) - return true; - - FLAC__ASSERT(decoder->protected_->state == FLAC__FILE_DECODER_OK); - - ret = FLAC__seekable_stream_decoder_process_whole_stream(decoder->private_->seekable_stream_decoder); - if(!ret) - decoder->protected_->state = FLAC__FILE_DECODER_SEEKABLE_STREAM_ERROR; - - return ret; -} - -FLAC__bool FLAC__file_decoder_process_metadata(FLAC__FileDecoder *decoder) -{ - FLAC__bool ret; - FLAC__ASSERT(decoder != 0); - - if(decoder->private_->seekable_stream_decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM) - decoder->protected_->state = FLAC__FILE_DECODER_END_OF_FILE; - - if(decoder->protected_->state == FLAC__FILE_DECODER_END_OF_FILE) - return true; - - FLAC__ASSERT(decoder->protected_->state == FLAC__FILE_DECODER_OK); - - ret = FLAC__seekable_stream_decoder_process_metadata(decoder->private_->seekable_stream_decoder); - if(!ret) - decoder->protected_->state = FLAC__FILE_DECODER_SEEKABLE_STREAM_ERROR; - - return ret; -} - -FLAC__bool FLAC__file_decoder_process_one_frame(FLAC__FileDecoder *decoder) -{ - FLAC__bool ret; - FLAC__ASSERT(decoder != 0); - - if(decoder->private_->seekable_stream_decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM) - decoder->protected_->state = FLAC__FILE_DECODER_END_OF_FILE; - - if(decoder->protected_->state == FLAC__FILE_DECODER_END_OF_FILE) - return true; - - FLAC__ASSERT(decoder->protected_->state == FLAC__FILE_DECODER_OK); - - ret = FLAC__seekable_stream_decoder_process_one_frame(decoder->private_->seekable_stream_decoder); - if(!ret) - decoder->protected_->state = FLAC__FILE_DECODER_SEEKABLE_STREAM_ERROR; - - return ret; -} - -FLAC__bool FLAC__file_decoder_process_remaining_frames(FLAC__FileDecoder *decoder) -{ - FLAC__bool ret; - FLAC__ASSERT(decoder != 0); - - if(decoder->private_->seekable_stream_decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM) - decoder->protected_->state = FLAC__FILE_DECODER_END_OF_FILE; - - if(decoder->protected_->state == FLAC__FILE_DECODER_END_OF_FILE) - return true; - - FLAC__ASSERT(decoder->protected_->state == FLAC__FILE_DECODER_OK); - - ret = FLAC__seekable_stream_decoder_process_remaining_frames(decoder->private_->seekable_stream_decoder); - if(!ret) - decoder->protected_->state = FLAC__FILE_DECODER_SEEKABLE_STREAM_ERROR; - - return ret; -} - -/*********************************************************************** - * - * Private class methods - * - ***********************************************************************/ - -FLAC__bool FLAC__file_decoder_seek_absolute(FLAC__FileDecoder *decoder, FLAC__uint64 sample) -{ - FLAC__ASSERT(decoder != 0); - FLAC__ASSERT(decoder->protected_->state == FLAC__FILE_DECODER_OK); - - if(decoder->private_->filename == 0) { /* means the file is stdin... */ - decoder->protected_->state = FLAC__FILE_DECODER_SEEK_ERROR; - return false; - } - - if(!FLAC__seekable_stream_decoder_seek_absolute(decoder->private_->seekable_stream_decoder, sample)) { - decoder->protected_->state = FLAC__FILE_DECODER_SEEK_ERROR; - return false; - } - else - return true; -} - -FLAC__SeekableStreamDecoderReadStatus read_callback_(const FLAC__SeekableStreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data) -{ - FLAC__FileDecoder *file_decoder = (FLAC__FileDecoder *)client_data; - (void)decoder; - - if(*bytes > 0) { - size_t bytes_read = fread(buffer, sizeof(FLAC__byte), *bytes, file_decoder->private_->file); - if(bytes_read == 0 && !feof(file_decoder->private_->file)) { - return FLAC__SEEKABLE_STREAM_DECODER_READ_STATUS_ERROR; - } - else { - *bytes = (unsigned)bytes_read; - return FLAC__SEEKABLE_STREAM_DECODER_READ_STATUS_OK; - } - } - else - return FLAC__SEEKABLE_STREAM_DECODER_READ_STATUS_ERROR; /* abort to avoid a deadlock */ -} - -FLAC__SeekableStreamDecoderSeekStatus seek_callback_(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data) -{ - FLAC__FileDecoder *file_decoder = (FLAC__FileDecoder *)client_data; - (void)decoder; - - if(fseek(file_decoder->private_->file, (long)absolute_byte_offset, SEEK_SET) < 0) - return FLAC__SEEKABLE_STREAM_DECODER_SEEK_STATUS_ERROR; - else - return FLAC__SEEKABLE_STREAM_DECODER_SEEK_STATUS_OK; -} - -FLAC__SeekableStreamDecoderTellStatus tell_callback_(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data) -{ - FLAC__FileDecoder *file_decoder = (FLAC__FileDecoder *)client_data; - long pos; - (void)decoder; - - if((pos = ftell(file_decoder->private_->file)) < 0) - return FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_ERROR; - else { - *absolute_byte_offset = (FLAC__uint64)pos; - return FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_OK; - } -} - -FLAC__SeekableStreamDecoderLengthStatus length_callback_(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data) -{ - FLAC__FileDecoder *file_decoder = (FLAC__FileDecoder *)client_data; - struct stat filestats; - (void)decoder; - - if(stat(file_decoder->private_->filename, &filestats) != 0) - return FLAC__SEEKABLE_STREAM_DECODER_LENGTH_STATUS_ERROR; - else { - *stream_length = (FLAC__uint64)filestats.st_size; - return FLAC__SEEKABLE_STREAM_DECODER_LENGTH_STATUS_OK; - } -} - -FLAC__bool eof_callback_(const FLAC__SeekableStreamDecoder *decoder, void *client_data) -{ - FLAC__FileDecoder *file_decoder = (FLAC__FileDecoder *)client_data; - (void)decoder; - - return feof(file_decoder->private_->file); -} - -FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__SeekableStreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 *buffer[], void *client_data) -{ - FLAC__FileDecoder *file_decoder = (FLAC__FileDecoder *)client_data; - (void)decoder; - - return file_decoder->private_->write_callback(file_decoder, frame, buffer, file_decoder->private_->client_data); -} - -void metadata_callback_(const FLAC__SeekableStreamDecoder *decoder, const FLAC__StreamMetaData *metadata, void *client_data) -{ - FLAC__FileDecoder *file_decoder = (FLAC__FileDecoder *)client_data; - (void)decoder; - - file_decoder->private_->metadata_callback(file_decoder, metadata, file_decoder->private_->client_data); -} - -void error_callback_(const FLAC__SeekableStreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data) -{ - FLAC__FileDecoder *file_decoder = (FLAC__FileDecoder *)client_data; - (void)decoder; - - file_decoder->private_->error_callback(file_decoder, status, file_decoder->private_->client_data); -} +/* libFLAC - Free Lossless Audio Codec library + * Copyright (C) 2000,2001 Josh Coalson + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Library General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Library General Public License for more details. + * + * You should have received a copy of the GNU Library General Public + * License along with this library; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 02111-1307, USA. + */ + +#include +#include /* for malloc() */ +#include /* for strcmp() */ +#include /* for stat() */ +#include "FLAC/assert.h" +#include "protected/file_decoder.h" +#include "protected/seekable_stream_decoder.h" +#include "private/md5.h" + +/*********************************************************************** + * + * Private class method prototypes + * + ***********************************************************************/ + +static FLAC__SeekableStreamDecoderReadStatus read_callback_(const FLAC__SeekableStreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data); +static FLAC__SeekableStreamDecoderSeekStatus seek_callback_(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data); +static FLAC__SeekableStreamDecoderTellStatus tell_callback_(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data); +static FLAC__SeekableStreamDecoderLengthStatus length_callback_(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data); +static FLAC__bool eof_callback_(const FLAC__SeekableStreamDecoder *decoder, void *client_data); +static FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__SeekableStreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 *buffer[], void *client_data); +static void metadata_callback_(const FLAC__SeekableStreamDecoder *decoder, const FLAC__StreamMetaData *metadata, void *client_data); +static void error_callback_(const FLAC__SeekableStreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data); + +/*********************************************************************** + * + * Private class data + * + ***********************************************************************/ + +typedef struct FLAC__FileDecoderPrivate { + FLAC__StreamDecoderWriteStatus (*write_callback)(const FLAC__FileDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 *buffer[], void *client_data); + void (*metadata_callback)(const FLAC__FileDecoder *decoder, const FLAC__StreamMetaData *metadata, void *client_data); + void (*error_callback)(const FLAC__FileDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data); + void *client_data; + FILE *file; + char *filename; /* == NULL if stdin */ + FLAC__SeekableStreamDecoder *seekable_stream_decoder; + struct { + FLAC__bool md5_checking; + } init_values_for_superclass; +} FLAC__FileDecoderPrivate; + +/*********************************************************************** + * + * Public static class data + * + ***********************************************************************/ + +const char *FLAC__FileDecoderStateString[] = { + "FLAC__FILE_DECODER_OK", + "FLAC__FILE_DECODER_SEEKING", + "FLAC__FILE_DECODER_END_OF_FILE", + "FLAC__FILE_DECODER_ERROR_OPENING_FILE", + "FLAC__FILE_DECODER_MEMORY_ALLOCATION_ERROR", + "FLAC__FILE_DECODER_SEEK_ERROR", + "FLAC__FILE_DECODER_STREAM_ERROR", + "FLAC__FILE_DECODER_STREAM_DECODER_ERROR", + "FLAC__FILE_DECODER_ALREADY_INITIALIZED", + "FLAC__FILE_DECODER_INVALID_CALLBACK", + "FLAC__FILE_DECODER_UNINITIALIZED" +}; + +/*********************************************************************** + * + * Class constructor/destructor + * + ***********************************************************************/ + +FLAC__FileDecoder *FLAC__file_decoder_new() +{ + FLAC__FileDecoder *decoder; + + FLAC__ASSERT(sizeof(int) >= 4); /* we want to die right away if this is not true */ + + decoder = (FLAC__FileDecoder*)malloc(sizeof(FLAC__FileDecoder)); + if(decoder == 0) { + return 0; + } + decoder->protected_ = (FLAC__FileDecoderProtected*)malloc(sizeof(FLAC__FileDecoderProtected)); + if(decoder->protected_ == 0) { + free(decoder); + return 0; + } + decoder->private_ = (FLAC__FileDecoderPrivate*)malloc(sizeof(FLAC__FileDecoderPrivate)); + if(decoder->private_ == 0) { + free(decoder->protected_); + free(decoder); + return 0; + } + + decoder->protected_->state = FLAC__FILE_DECODER_UNINITIALIZED; + + decoder->private_->filename = 0; + decoder->private_->write_callback = 0; + decoder->private_->metadata_callback = 0; + decoder->private_->error_callback = 0; + decoder->private_->client_data = 0; + decoder->private_->init_values_for_superclass.md5_checking = false; + + return decoder; +} + +void FLAC__file_decoder_delete(FLAC__FileDecoder *decoder) +{ + FLAC__ASSERT(decoder != 0); + FLAC__ASSERT(decoder->protected_ != 0); + FLAC__ASSERT(decoder->private_ != 0); + + free(decoder->private_); + free(decoder->protected_); + free(decoder); +} + +/*********************************************************************** + * + * Public class methods + * + ***********************************************************************/ + +FLAC__FileDecoderState FLAC__file_decoder_init(FLAC__FileDecoder *decoder) +{ + FLAC__ASSERT(decoder != 0); + + if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED) + return decoder->protected_->state = FLAC__FILE_DECODER_ALREADY_INITIALIZED; + + decoder->protected_->state = FLAC__FILE_DECODER_OK; + + if(0 == decoder->private_->write_callback || 0 == decoder->private_->metadata_callback || 0 == decoder->private_->error_callback) + return decoder->protected_->state = FLAC__FILE_DECODER_INVALID_CALLBACK; + + decoder->private_->file = 0; + decoder->private_->seekable_stream_decoder = 0; + + if(0 == decoder->private_->filename) + decoder->private_->file = stdin; + else + decoder->private_->file = fopen(decoder->private_->filename, "rb"); + + if(decoder->private_->file == 0) + return decoder->protected_->state = FLAC__FILE_DECODER_ERROR_OPENING_FILE; + + decoder->private_->seekable_stream_decoder = FLAC__seekable_stream_decoder_new(); + + if(0 == decoder->private_->seekable_stream_decoder) + return decoder->protected_->state = FLAC__FILE_DECODER_MEMORY_ALLOCATION_ERROR; + + FLAC__seekable_stream_decoder_set_read_callback(decoder->private_->seekable_stream_decoder, read_callback_); + FLAC__seekable_stream_decoder_set_seek_callback(decoder->private_->seekable_stream_decoder, seek_callback_); + FLAC__seekable_stream_decoder_set_tell_callback(decoder->private_->seekable_stream_decoder, tell_callback_); + FLAC__seekable_stream_decoder_set_length_callback(decoder->private_->seekable_stream_decoder, length_callback_); + FLAC__seekable_stream_decoder_set_eof_callback(decoder->private_->seekable_stream_decoder, eof_callback_); + FLAC__seekable_stream_decoder_set_write_callback(decoder->private_->seekable_stream_decoder, write_callback_); + FLAC__seekable_stream_decoder_set_metadata_callback(decoder->private_->seekable_stream_decoder, metadata_callback_); + FLAC__seekable_stream_decoder_set_error_callback(decoder->private_->seekable_stream_decoder, error_callback_); + FLAC__seekable_stream_decoder_set_client_data(decoder->private_->seekable_stream_decoder, decoder); + + /* + * Unfortunately, because of the "_new() ... _set_() ... _init()" order of + * decoder initialization, settings that are 'inherited' from the superclass + * have to be passed up this way, because the superclass has not even been + * created yet when the value is set in the subclass. + */ + (void)FLAC__seekable_stream_decoder_set_md5_checking(decoder->private_->seekable_stream_decoder, decoder->private_->init_values_for_superclass.md5_checking); + + if(FLAC__seekable_stream_decoder_init(decoder->private_->seekable_stream_decoder) != FLAC__SEEKABLE_STREAM_DECODER_OK) + return decoder->protected_->state = FLAC__FILE_DECODER_STREAM_DECODER_ERROR; /*@@@ change this to FLAC__FILE_DECODER_SEEKABLE_STREAM_ERROR in next minor-revision */ + + return decoder->protected_->state; +} + +FLAC__bool FLAC__file_decoder_finish(FLAC__FileDecoder *decoder) +{ + FLAC__bool ok = true; + + FLAC__ASSERT(decoder != 0); + if(decoder->protected_->state == FLAC__FILE_DECODER_UNINITIALIZED) + return true; + if(decoder->private_->file != 0 && decoder->private_->file != stdin) + fclose(decoder->private_->file); + if(0 != decoder->private_->filename) + free(decoder->private_->filename); + if(decoder->private_->seekable_stream_decoder != 0) { + ok = FLAC__seekable_stream_decoder_finish(decoder->private_->seekable_stream_decoder); + FLAC__seekable_stream_decoder_delete(decoder->private_->seekable_stream_decoder); + } + decoder->protected_->state = FLAC__FILE_DECODER_UNINITIALIZED; + return ok; +} + +FLAC__bool FLAC__file_decoder_set_md5_checking(const FLAC__FileDecoder *decoder, FLAC__bool value) +{ + if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED) + return false; + decoder->private_->init_values_for_superclass.md5_checking = value; + return true; +} + +FLAC__bool FLAC__file_decoder_set_filename(const FLAC__FileDecoder *decoder, const char *value) +{ + FLAC__ASSERT(value != 0); + if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED) + return false; + if(0 != decoder->private_->filename) + free(decoder->private_->filename); + if(0 == strcmp(value, "-")) { + decoder->private_->filename = 0; + } + else { + if(0 == (decoder->private_->filename = (char*)malloc(strlen(value)+1))) { + decoder->protected_->state = FLAC__FILE_DECODER_MEMORY_ALLOCATION_ERROR; + return false; + } + strcpy(decoder->private_->filename, value); + } + return true; +} + +FLAC__bool FLAC__file_decoder_set_write_callback(const FLAC__FileDecoder *decoder, FLAC__StreamDecoderWriteStatus (*value)(const FLAC__FileDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 *buffer[], void *client_data)) +{ + if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED) + return false; + decoder->private_->write_callback = value; + return true; +} + +FLAC__bool FLAC__file_decoder_set_metadata_callback(const FLAC__FileDecoder *decoder, void (*value)(const FLAC__FileDecoder *decoder, const FLAC__StreamMetaData *metadata, void *client_data)) +{ + if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED) + return false; + decoder->private_->metadata_callback = value; + return true; +} + +FLAC__bool FLAC__file_decoder_set_error_callback(const FLAC__FileDecoder *decoder, void (*value)(const FLAC__FileDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)) +{ + if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED) + return false; + decoder->private_->error_callback = value; + return true; +} + +FLAC__bool FLAC__file_decoder_set_client_data(const FLAC__FileDecoder *decoder, void *value) +{ + if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED) + return false; + decoder->private_->client_data = value; + return true; +} + +FLAC__FileDecoderState FLAC__file_decoder_get_state(const FLAC__FileDecoder *decoder) +{ + return decoder->protected_->state; +} + +FLAC__bool FLAC__file_decoder_get_md5_checking(const FLAC__FileDecoder *decoder) +{ + return FLAC__seekable_stream_decoder_get_md5_checking(decoder->private_->seekable_stream_decoder); +} + +FLAC__bool FLAC__file_decoder_process_whole_file(FLAC__FileDecoder *decoder) +{ + FLAC__bool ret; + FLAC__ASSERT(decoder != 0); + + if(decoder->private_->seekable_stream_decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM) + decoder->protected_->state = FLAC__FILE_DECODER_END_OF_FILE; + + if(decoder->protected_->state == FLAC__FILE_DECODER_END_OF_FILE) + return true; + + FLAC__ASSERT(decoder->protected_->state == FLAC__FILE_DECODER_OK); + + ret = FLAC__seekable_stream_decoder_process_whole_stream(decoder->private_->seekable_stream_decoder); + if(!ret) + decoder->protected_->state = FLAC__FILE_DECODER_SEEKABLE_STREAM_ERROR; + + return ret; +} + +FLAC__bool FLAC__file_decoder_process_metadata(FLAC__FileDecoder *decoder) +{ + FLAC__bool ret; + FLAC__ASSERT(decoder != 0); + + if(decoder->private_->seekable_stream_decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM) + decoder->protected_->state = FLAC__FILE_DECODER_END_OF_FILE; + + if(decoder->protected_->state == FLAC__FILE_DECODER_END_OF_FILE) + return true; + + FLAC__ASSERT(decoder->protected_->state == FLAC__FILE_DECODER_OK); + + ret = FLAC__seekable_stream_decoder_process_metadata(decoder->private_->seekable_stream_decoder); + if(!ret) + decoder->protected_->state = FLAC__FILE_DECODER_SEEKABLE_STREAM_ERROR; + + return ret; +} + +FLAC__bool FLAC__file_decoder_process_one_frame(FLAC__FileDecoder *decoder) +{ + FLAC__bool ret; + FLAC__ASSERT(decoder != 0); + + if(decoder->private_->seekable_stream_decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM) + decoder->protected_->state = FLAC__FILE_DECODER_END_OF_FILE; + + if(decoder->protected_->state == FLAC__FILE_DECODER_END_OF_FILE) + return true; + + FLAC__ASSERT(decoder->protected_->state == FLAC__FILE_DECODER_OK); + + ret = FLAC__seekable_stream_decoder_process_one_frame(decoder->private_->seekable_stream_decoder); + if(!ret) + decoder->protected_->state = FLAC__FILE_DECODER_SEEKABLE_STREAM_ERROR; + + return ret; +} + +FLAC__bool FLAC__file_decoder_process_remaining_frames(FLAC__FileDecoder *decoder) +{ + FLAC__bool ret; + FLAC__ASSERT(decoder != 0); + + if(decoder->private_->seekable_stream_decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM) + decoder->protected_->state = FLAC__FILE_DECODER_END_OF_FILE; + + if(decoder->protected_->state == FLAC__FILE_DECODER_END_OF_FILE) + return true; + + FLAC__ASSERT(decoder->protected_->state == FLAC__FILE_DECODER_OK); + + ret = FLAC__seekable_stream_decoder_process_remaining_frames(decoder->private_->seekable_stream_decoder); + if(!ret) + decoder->protected_->state = FLAC__FILE_DECODER_SEEKABLE_STREAM_ERROR; + + return ret; +} + +/*********************************************************************** + * + * Private class methods + * + ***********************************************************************/ + +FLAC__bool FLAC__file_decoder_seek_absolute(FLAC__FileDecoder *decoder, FLAC__uint64 sample) +{ + FLAC__ASSERT(decoder != 0); + FLAC__ASSERT(decoder->protected_->state == FLAC__FILE_DECODER_OK); + + if(decoder->private_->filename == 0) { /* means the file is stdin... */ + decoder->protected_->state = FLAC__FILE_DECODER_SEEK_ERROR; + return false; + } + + if(!FLAC__seekable_stream_decoder_seek_absolute(decoder->private_->seekable_stream_decoder, sample)) { + decoder->protected_->state = FLAC__FILE_DECODER_SEEK_ERROR; + return false; + } + else + return true; +} + +FLAC__SeekableStreamDecoderReadStatus read_callback_(const FLAC__SeekableStreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data) +{ + FLAC__FileDecoder *file_decoder = (FLAC__FileDecoder *)client_data; + (void)decoder; + + if(*bytes > 0) { + size_t bytes_read = fread(buffer, sizeof(FLAC__byte), *bytes, file_decoder->private_->file); + if(bytes_read == 0 && !feof(file_decoder->private_->file)) { + return FLAC__SEEKABLE_STREAM_DECODER_READ_STATUS_ERROR; + } + else { + *bytes = (unsigned)bytes_read; + return FLAC__SEEKABLE_STREAM_DECODER_READ_STATUS_OK; + } + } + else + return FLAC__SEEKABLE_STREAM_DECODER_READ_STATUS_ERROR; /* abort to avoid a deadlock */ +} + +FLAC__SeekableStreamDecoderSeekStatus seek_callback_(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data) +{ + FLAC__FileDecoder *file_decoder = (FLAC__FileDecoder *)client_data; + (void)decoder; + + if(fseek(file_decoder->private_->file, (long)absolute_byte_offset, SEEK_SET) < 0) + return FLAC__SEEKABLE_STREAM_DECODER_SEEK_STATUS_ERROR; + else + return FLAC__SEEKABLE_STREAM_DECODER_SEEK_STATUS_OK; +} + +FLAC__SeekableStreamDecoderTellStatus tell_callback_(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data) +{ + FLAC__FileDecoder *file_decoder = (FLAC__FileDecoder *)client_data; + long pos; + (void)decoder; + + if((pos = ftell(file_decoder->private_->file)) < 0) + return FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_ERROR; + else { + *absolute_byte_offset = (FLAC__uint64)pos; + return FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_OK; + } +} + +FLAC__SeekableStreamDecoderLengthStatus length_callback_(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data) +{ + FLAC__FileDecoder *file_decoder = (FLAC__FileDecoder *)client_data; + struct stat filestats; + (void)decoder; + + if(stat(file_decoder->private_->filename, &filestats) != 0) + return FLAC__SEEKABLE_STREAM_DECODER_LENGTH_STATUS_ERROR; + else { + *stream_length = (FLAC__uint64)filestats.st_size; + return FLAC__SEEKABLE_STREAM_DECODER_LENGTH_STATUS_OK; + } +} + +FLAC__bool eof_callback_(const FLAC__SeekableStreamDecoder *decoder, void *client_data) +{ + FLAC__FileDecoder *file_decoder = (FLAC__FileDecoder *)client_data; + (void)decoder; + + return feof(file_decoder->private_->file); +} + +FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__SeekableStreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 *buffer[], void *client_data) +{ + FLAC__FileDecoder *file_decoder = (FLAC__FileDecoder *)client_data; + (void)decoder; + + return file_decoder->private_->write_callback(file_decoder, frame, buffer, file_decoder->private_->client_data); +} + +void metadata_callback_(const FLAC__SeekableStreamDecoder *decoder, const FLAC__StreamMetaData *metadata, void *client_data) +{ + FLAC__FileDecoder *file_decoder = (FLAC__FileDecoder *)client_data; + (void)decoder; + + file_decoder->private_->metadata_callback(file_decoder, metadata, file_decoder->private_->client_data); +} + +void error_callback_(const FLAC__SeekableStreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data) +{ + FLAC__FileDecoder *file_decoder = (FLAC__FileDecoder *)client_data; + (void)decoder; + + file_decoder->private_->error_callback(file_decoder, status, file_decoder->private_->client_data); +} diff --git a/src/libFLAC/seekable_stream_decoder.c b/src/libFLAC/seekable_stream_decoder.c index 78ade18..31b02f0 100644 --- a/src/libFLAC/seekable_stream_decoder.c +++ b/src/libFLAC/seekable_stream_decoder.c @@ -1,716 +1,716 @@ -/* libFLAC - Free Lossless Audio Codec library - * Copyright (C) 2000,2001 Josh Coalson - * - * This library is free software; you can redistribute it and/or - * modify it under the terms of the GNU Library General Public - * License as published by the Free Software Foundation; either - * version 2 of the License, or (at your option) any later version. - * - * This library is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Library General Public License for more details. - * - * You should have received a copy of the GNU Library General Public - * License along with this library; if not, write to the - * Free Software Foundation, Inc., 59 Temple Place - Suite 330, - * Boston, MA 02111-1307, USA. - */ - -#include -#include /* for malloc() */ -#include "FLAC/assert.h" -#include "protected/seekable_stream_decoder.h" -#include "protected/stream_decoder.h" -#include "private/md5.h" - -/*********************************************************************** - * - * Private class method prototypes - * - ***********************************************************************/ - -static FLAC__StreamDecoderReadStatus read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data); -static FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 *buffer[], void *client_data); -static void metadata_callback_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetaData *metadata, void *client_data); -static void error_callback_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data); -static FLAC__bool seek_to_absolute_sample_(FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample); - -/*********************************************************************** - * - * Private class data - * - ***********************************************************************/ - -typedef struct FLAC__SeekableStreamDecoderPrivate { - FLAC__SeekableStreamDecoderReadStatus (*read_callback)(const FLAC__SeekableStreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data); - FLAC__SeekableStreamDecoderSeekStatus (*seek_callback)(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data); - FLAC__SeekableStreamDecoderTellStatus (*tell_callback)(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data); - FLAC__SeekableStreamDecoderLengthStatus (*length_callback)(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data); - FLAC__bool (*eof_callback)(const FLAC__SeekableStreamDecoder *decoder, void *client_data); - FLAC__StreamDecoderWriteStatus (*write_callback)(const FLAC__SeekableStreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 *buffer[], void *client_data); - void (*metadata_callback)(const FLAC__SeekableStreamDecoder *decoder, const FLAC__StreamMetaData *metadata, void *client_data); - void (*error_callback)(const FLAC__SeekableStreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data); - void *client_data; - FLAC__StreamDecoder *stream_decoder; - struct MD5Context md5context; - FLAC__byte stored_md5sum[16]; /* this is what is stored in the metadata */ - FLAC__byte computed_md5sum[16]; /* this is the sum we computed from the decoded data */ - /* the rest of these are only used for seeking: */ - FLAC__StreamMetaData_StreamInfo stream_info; /* we keep this around so we can figure out how to seek quickly */ - const FLAC__StreamMetaData_SeekTable *seek_table; /* we hold a pointer to the stream decoder's seek table for the same reason */ - FLAC__Frame last_frame; /* holds the info of the last frame we seeked to */ - FLAC__uint64 target_sample; -} FLAC__SeekableStreamDecoderPrivate; - -/*********************************************************************** - * - * Public static class data - * - ***********************************************************************/ - -const char *FLAC__SeekableStreamDecoderStateString[] = { - "FLAC__SEEKABLE_STREAM_DECODER_OK", - "FLAC__SEEKABLE_STREAM_DECODER_SEEKING", - "FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM", - "FLAC__SEEKABLE_STREAM_DECODER_MEMORY_ALLOCATION_ERROR", - "FLAC__SEEKABLE_STREAM_DECODER_STREAM_ERROR", - "FLAC__SEEKABLE_STREAM_DECODER_READ_ERROR", - "FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR", - "FLAC__SEEKABLE_STREAM_DECODER_ALREADY_INITIALIZED", - "FLAC__SEEKABLE_STREAM_DECODER_INVALID_CALLBACK", - "FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED" -}; - -const char *FLAC__SeekableStreamDecoderReadStatusString[] = { - "FLAC__STREAM_DECODER_READ_STATUS_OK", - "FLAC__STREAM_DECODER_READ_STATUS_ERROR" -}; - -const char *FLAC__SeekableStreamDecoderSeekStatusString[] = { - "FLAC__STREAM_DECODER_SEEK_STATUS_OK", - "FLAC__STREAM_DECODER_SEEK_STATUS_ERROR" -}; - -const char *FLAC__SeekableStreamDecoderTellStatusString[] = { - "FLAC__STREAM_DECODER_TELL_STATUS_OK", - "FLAC__STREAM_DECODER_TELL_STATUS_ERROR" -}; - -const char *FLAC__SeekableStreamDecoderLengthStatusString[] = { - "FLAC__STREAM_DECODER_LENGTH_STATUS_OK", - "FLAC__STREAM_DECODER_LENGTH_STATUS_ERROR" -}; - -/*********************************************************************** - * - * Class constructor/destructor - * - ***********************************************************************/ - -FLAC__SeekableStreamDecoder *FLAC__seekable_stream_decoder_new() -{ - FLAC__SeekableStreamDecoder *decoder; - - FLAC__ASSERT(sizeof(int) >= 4); /* we want to die right away if this is not true */ - - decoder = (FLAC__SeekableStreamDecoder*)malloc(sizeof(FLAC__SeekableStreamDecoder)); - if(decoder == 0) { - return 0; - } - decoder->protected_ = (FLAC__SeekableStreamDecoderProtected*)malloc(sizeof(FLAC__SeekableStreamDecoderProtected)); - if(decoder->protected_ == 0) { - free(decoder); - return 0; - } - decoder->private_ = (FLAC__SeekableStreamDecoderPrivate*)malloc(sizeof(FLAC__SeekableStreamDecoderPrivate)); - if(decoder->private_ == 0) { - free(decoder->protected_); - free(decoder); - return 0; - } - - decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED; - - decoder->private_->read_callback = 0; - decoder->private_->seek_callback = 0; - decoder->private_->tell_callback = 0; - decoder->private_->length_callback = 0; - decoder->private_->eof_callback = 0; - decoder->private_->write_callback = 0; - decoder->private_->metadata_callback = 0; - decoder->private_->error_callback = 0; - decoder->private_->client_data = 0; - - return decoder; -} - -void FLAC__seekable_stream_decoder_delete(FLAC__SeekableStreamDecoder *decoder) -{ - FLAC__ASSERT(decoder != 0); - FLAC__ASSERT(decoder->protected_ != 0); - FLAC__ASSERT(decoder->private_ != 0); - - free(decoder->private_); - free(decoder->protected_); - free(decoder); -} - -/*********************************************************************** - * - * Public class methods - * - ***********************************************************************/ - -FLAC__SeekableStreamDecoderState FLAC__seekable_stream_decoder_init(FLAC__SeekableStreamDecoder *decoder) -{ - FLAC__ASSERT(decoder != 0); - - if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) - return decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_ALREADY_INITIALIZED; - - decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_OK; - - if(0 == decoder->private_->read_callback || 0 == decoder->private_->seek_callback || 0 == decoder->private_->tell_callback || 0 == decoder->private_->length_callback || 0 == decoder->private_->eof_callback) - return decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_INVALID_CALLBACK; - - if(0 == decoder->private_->write_callback || 0 == decoder->private_->metadata_callback || 0 == decoder->private_->error_callback) - return decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_INVALID_CALLBACK; - - decoder->private_->stream_decoder = 0; - decoder->private_->seek_table = 0; - - /* We initialize the MD5Context even though we may never use it. This is - * because md5_checking may be turned on to start and then turned off if a - * seek occurs. So we always init the context here and finalize it in - * FLAC__seekable_stream_decoder_finish() to make sure things are always - * cleaned up properly. - */ - MD5Init(&decoder->private_->md5context); - - decoder->private_->stream_decoder = FLAC__stream_decoder_new(); - - if(0 == decoder->private_->stream_decoder) - return decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_MEMORY_ALLOCATION_ERROR; - - FLAC__stream_decoder_set_read_callback(decoder->private_->stream_decoder, read_callback_); - FLAC__stream_decoder_set_write_callback(decoder->private_->stream_decoder, write_callback_); - FLAC__stream_decoder_set_metadata_callback(decoder->private_->stream_decoder, metadata_callback_); - FLAC__stream_decoder_set_error_callback(decoder->private_->stream_decoder, error_callback_); - FLAC__stream_decoder_set_client_data(decoder->private_->stream_decoder, decoder); - - if(FLAC__stream_decoder_init(decoder->private_->stream_decoder) != FLAC__STREAM_DECODER_SEARCH_FOR_METADATA) - return decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_ERROR; - - return decoder->protected_->state; -} - -FLAC__bool FLAC__seekable_stream_decoder_finish(FLAC__SeekableStreamDecoder *decoder) -{ - FLAC__bool md5_failed = false; - - FLAC__ASSERT(decoder != 0); - if(decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) - return true; - /* see the comment in FLAC__seekable_stream_decoder_init() as to why we - * always call MD5Final() - */ - MD5Final(decoder->private_->computed_md5sum, &decoder->private_->md5context); - if(decoder->private_->stream_decoder != 0) { - FLAC__stream_decoder_finish(decoder->private_->stream_decoder); - FLAC__stream_decoder_delete(decoder->private_->stream_decoder); - } - if(decoder->protected_->md5_checking) { - if(memcmp(decoder->private_->stored_md5sum, decoder->private_->computed_md5sum, 16)) - md5_failed = true; - } - decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED; - return !md5_failed; -} - -FLAC__bool FLAC__seekable_stream_decoder_set_md5_checking(const FLAC__SeekableStreamDecoder *decoder, FLAC__bool value) -{ - if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) - return false; - decoder->protected_->md5_checking = value; - return true; -} - -FLAC__bool FLAC__seekable_stream_decoder_set_read_callback(const FLAC__SeekableStreamDecoder *decoder, FLAC__SeekableStreamDecoderReadStatus (*value)(const FLAC__SeekableStreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data)) -{ - if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) - return false; - decoder->private_->read_callback = value; - return true; -} - -FLAC__bool FLAC__seekable_stream_decoder_set_seek_callback(const FLAC__SeekableStreamDecoder *decoder, FLAC__SeekableStreamDecoderSeekStatus (*value)(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data)) -{ - if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) - return false; - decoder->private_->seek_callback = value; - return true; -} - -FLAC__bool FLAC__seekable_stream_decoder_set_tell_callback(const FLAC__SeekableStreamDecoder *decoder, FLAC__SeekableStreamDecoderTellStatus (*value)(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data)) -{ - if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) - return false; - decoder->private_->tell_callback = value; - return true; -} - -FLAC__bool FLAC__seekable_stream_decoder_set_length_callback(const FLAC__SeekableStreamDecoder *decoder, FLAC__SeekableStreamDecoderLengthStatus (*value)(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data)) -{ - if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) - return false; - decoder->private_->length_callback = value; - return true; -} - -FLAC__bool FLAC__seekable_stream_decoder_set_eof_callback(const FLAC__SeekableStreamDecoder *decoder, FLAC__bool (*value)(const FLAC__SeekableStreamDecoder *decoder, void *client_data)) -{ - if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) - return false; - decoder->private_->eof_callback = value; - return true; -} - -FLAC__bool FLAC__seekable_stream_decoder_set_write_callback(const FLAC__SeekableStreamDecoder *decoder, FLAC__StreamDecoderWriteStatus (*value)(const FLAC__SeekableStreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 *buffer[], void *client_data)) -{ - if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) - return false; - decoder->private_->write_callback = value; - return true; -} - -FLAC__bool FLAC__seekable_stream_decoder_set_metadata_callback(const FLAC__SeekableStreamDecoder *decoder, void (*value)(const FLAC__SeekableStreamDecoder *decoder, const FLAC__StreamMetaData *metadata, void *client_data)) -{ - if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) - return false; - decoder->private_->metadata_callback = value; - return true; -} - -FLAC__bool FLAC__seekable_stream_decoder_set_error_callback(const FLAC__SeekableStreamDecoder *decoder, void (*value)(const FLAC__SeekableStreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)) -{ - if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) - return false; - decoder->private_->error_callback = value; - return true; -} - -FLAC__bool FLAC__seekable_stream_decoder_set_client_data(const FLAC__SeekableStreamDecoder *decoder, void *value) -{ - if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) - return false; - decoder->private_->client_data = value; - return true; -} - -FLAC__SeekableStreamDecoderState FLAC__seekable_stream_decoder_get_state(const FLAC__SeekableStreamDecoder *decoder) -{ - return decoder->protected_->state; -} - -FLAC__bool FLAC__seekable_stream_decoder_get_md5_checking(const FLAC__SeekableStreamDecoder *decoder) -{ - return decoder->protected_->md5_checking; -} - -FLAC__bool FLAC__seekable_stream_decoder_process_whole_stream(FLAC__SeekableStreamDecoder *decoder) -{ - FLAC__bool ret; - FLAC__ASSERT(decoder != 0); - - if(decoder->private_->stream_decoder->protected_->state == FLAC__STREAM_DECODER_END_OF_STREAM) - decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM; - - if(decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM) - return true; - - FLAC__ASSERT(decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_OK); - - ret = FLAC__stream_decoder_process_whole_stream(decoder->private_->stream_decoder); - if(!ret) - decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_ERROR; - - return ret; -} - -FLAC__bool FLAC__seekable_stream_decoder_process_metadata(FLAC__SeekableStreamDecoder *decoder) -{ - FLAC__bool ret; - FLAC__ASSERT(decoder != 0); - - if(decoder->private_->stream_decoder->protected_->state == FLAC__STREAM_DECODER_END_OF_STREAM) - decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM; - - if(decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM) - return true; - - FLAC__ASSERT(decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_OK); - - ret = FLAC__stream_decoder_process_metadata(decoder->private_->stream_decoder); - if(!ret) - decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_ERROR; - - return ret; -} - -FLAC__bool FLAC__seekable_stream_decoder_process_one_frame(FLAC__SeekableStreamDecoder *decoder) -{ - FLAC__bool ret; - FLAC__ASSERT(decoder != 0); - - if(decoder->private_->stream_decoder->protected_->state == FLAC__STREAM_DECODER_END_OF_STREAM) - decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM; - - if(decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM) - return true; - - FLAC__ASSERT(decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_OK); - - ret = FLAC__stream_decoder_process_one_frame(decoder->private_->stream_decoder); - if(!ret) - decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_ERROR; - - return ret; -} - -FLAC__bool FLAC__seekable_stream_decoder_process_remaining_frames(FLAC__SeekableStreamDecoder *decoder) -{ - FLAC__bool ret; - FLAC__ASSERT(decoder != 0); - - if(decoder->private_->stream_decoder->protected_->state == FLAC__STREAM_DECODER_END_OF_STREAM) - decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM; - - if(decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM) - return true; - - FLAC__ASSERT(decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_OK); - - ret = FLAC__stream_decoder_process_remaining_frames(decoder->private_->stream_decoder); - if(!ret) - decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_ERROR; - - return ret; -} - -FLAC__bool FLAC__seekable_stream_decoder_seek_absolute(FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 sample) -{ - FLAC__uint64 length; - - FLAC__ASSERT(decoder != 0); - FLAC__ASSERT(decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_OK); - - decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEKING; - - /* turn off md5 checking if a seek is attempted */ - decoder->protected_->md5_checking = false; - - if(!FLAC__stream_decoder_reset(decoder->private_->stream_decoder)) { - decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_ERROR; - return false; - } - /* get the file length */ - if(decoder->private_->length_callback(decoder, &length, decoder->private_->client_data) != FLAC__SEEKABLE_STREAM_DECODER_LENGTH_STATUS_OK) { - decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR; - return false; - } - /* rewind */ - if(decoder->private_->seek_callback(decoder, 0, decoder->private_->client_data) != FLAC__SEEKABLE_STREAM_DECODER_SEEK_STATUS_OK) { - decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR; - return false; - } - if(!FLAC__stream_decoder_process_metadata(decoder->private_->stream_decoder)) { - decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_ERROR; - return false; - } - if(sample > decoder->private_->stream_info.total_samples) { - decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR; - return false; - } - - return seek_to_absolute_sample_(decoder, length, sample); -} - -/*********************************************************************** - * - * Private class methods - * - ***********************************************************************/ - -FLAC__StreamDecoderReadStatus read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data) -{ - FLAC__SeekableStreamDecoder *seekable_stream_decoder = (FLAC__SeekableStreamDecoder *)client_data; - (void)decoder; - if(seekable_stream_decoder->private_->eof_callback(seekable_stream_decoder, seekable_stream_decoder->private_->client_data)) { - seekable_stream_decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM; - return FLAC__STREAM_DECODER_READ_END_OF_STREAM; - } - else if(*bytes > 0) { - unsigned bytes_read = *bytes; - if(seekable_stream_decoder->private_->read_callback(seekable_stream_decoder, buffer, &bytes_read, seekable_stream_decoder->private_->client_data) != FLAC__SEEKABLE_STREAM_DECODER_READ_STATUS_OK) { - seekable_stream_decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_READ_ERROR; - return FLAC__STREAM_DECODER_READ_ABORT; - } - if(bytes_read == 0) { - if(seekable_stream_decoder->private_->eof_callback(seekable_stream_decoder, seekable_stream_decoder->private_->client_data)) { - seekable_stream_decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM; - return FLAC__STREAM_DECODER_READ_END_OF_STREAM; - } - else - return FLAC__STREAM_DECODER_READ_CONTINUE; - } - else { - *bytes = bytes_read; - return FLAC__STREAM_DECODER_READ_CONTINUE; - } - } - else - return FLAC__STREAM_DECODER_READ_ABORT; /* abort to avoid a deadlock */ -} - -FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 *buffer[], void *client_data) -{ - FLAC__SeekableStreamDecoder *seekable_stream_decoder = (FLAC__SeekableStreamDecoder *)client_data; - (void)decoder; - - if(seekable_stream_decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_SEEKING) { - FLAC__uint64 this_frame_sample = frame->header.number.sample_number; - FLAC__uint64 next_frame_sample = this_frame_sample + (FLAC__uint64)frame->header.blocksize; - FLAC__uint64 target_sample = seekable_stream_decoder->private_->target_sample; - - FLAC__ASSERT(frame->header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER); - - seekable_stream_decoder->private_->last_frame = *frame; /* save the frame */ - if(this_frame_sample <= target_sample && target_sample < next_frame_sample) { /* we hit our target frame */ - unsigned delta = (unsigned)(target_sample - this_frame_sample); - /* kick out of seek mode */ - seekable_stream_decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_OK; - /* shift out the samples before target_sample */ - if(delta > 0) { - unsigned channel; - const FLAC__int32 *newbuffer[FLAC__MAX_CHANNELS]; - for(channel = 0; channel < frame->header.channels; channel++) - newbuffer[channel] = buffer[channel] + delta; - seekable_stream_decoder->private_->last_frame.header.blocksize -= delta; - seekable_stream_decoder->private_->last_frame.header.number.sample_number += (FLAC__uint64)delta; - /* write the relevant samples */ - return seekable_stream_decoder->private_->write_callback(seekable_stream_decoder, &seekable_stream_decoder->private_->last_frame, newbuffer, seekable_stream_decoder->private_->client_data); - } - else { - /* write the relevant samples */ - return seekable_stream_decoder->private_->write_callback(seekable_stream_decoder, frame, buffer, seekable_stream_decoder->private_->client_data); - } - } - else { - return FLAC__STREAM_DECODER_WRITE_CONTINUE; - } - } - else { - if(seekable_stream_decoder->protected_->md5_checking) { - if(!FLAC__MD5Accumulate(&seekable_stream_decoder->private_->md5context, buffer, frame->header.channels, frame->header.blocksize, (frame->header.bits_per_sample+7) / 8)) - return FLAC__STREAM_DECODER_WRITE_ABORT; - } - return seekable_stream_decoder->private_->write_callback(seekable_stream_decoder, frame, buffer, seekable_stream_decoder->private_->client_data); - } -} - -void metadata_callback_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetaData *metadata, void *client_data) -{ - FLAC__SeekableStreamDecoder *seekable_stream_decoder = (FLAC__SeekableStreamDecoder *)client_data; - (void)decoder; - - if(metadata->type == FLAC__METADATA_TYPE_STREAMINFO) { - seekable_stream_decoder->private_->stream_info = metadata->data.stream_info; - /* save the MD5 signature for comparison later */ - memcpy(seekable_stream_decoder->private_->stored_md5sum, metadata->data.stream_info.md5sum, 16); - if(0 == memcmp(seekable_stream_decoder->private_->stored_md5sum, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", 16)) - seekable_stream_decoder->protected_->md5_checking = false; - } - else if(metadata->type == FLAC__METADATA_TYPE_SEEKTABLE) { - seekable_stream_decoder->private_->seek_table = &metadata->data.seek_table; - } - - if(seekable_stream_decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_SEEKING) - seekable_stream_decoder->private_->metadata_callback(seekable_stream_decoder, metadata, seekable_stream_decoder->private_->client_data); -} - -void error_callback_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data) -{ - FLAC__SeekableStreamDecoder *seekable_stream_decoder = (FLAC__SeekableStreamDecoder *)client_data; - (void)decoder; - - if(seekable_stream_decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_SEEKING) - seekable_stream_decoder->private_->error_callback(seekable_stream_decoder, status, seekable_stream_decoder->private_->client_data); -} - -FLAC__bool seek_to_absolute_sample_(FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample) -{ - FLAC__uint64 first_frame_offset, lower_bound, upper_bound; - FLAC__int64 pos = -1, last_pos = -1; - int i, lower_seek_point = -1, upper_seek_point = -1; - unsigned approx_bytes_per_frame; - FLAC__uint64 last_frame_sample = 0xffffffffffffffff; - FLAC__bool needs_seek; - const FLAC__bool is_variable_blocksize_stream = (decoder->private_->stream_info.min_blocksize != decoder->private_->stream_info.max_blocksize); - - /* we are just guessing here, but we want to guess high, not low */ - if(decoder->private_->stream_info.max_framesize > 0) { - approx_bytes_per_frame = decoder->private_->stream_info.max_framesize; - } - else if(!is_variable_blocksize_stream) { - /* note there are no () around 'decoder->private_->stream_info.bits_per_sample/8' to keep precision up since it's an integer calulation */ - approx_bytes_per_frame = decoder->private_->stream_info.min_blocksize * decoder->private_->stream_info.channels * decoder->private_->stream_info.bits_per_sample/8 + 64; - } - else - approx_bytes_per_frame = 1152 * decoder->private_->stream_info.channels * decoder->private_->stream_info.bits_per_sample/8 + 64; - - /* - * The stream position is currently at the first frame plus any read - * ahead data, so first we get the stream position, then subtract - * uncomsumed bytes to get the position of the first frame in the - * stream. - */ - if(decoder->private_->tell_callback(decoder, &first_frame_offset, decoder->private_->client_data) != FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_OK) { - decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR; - return false; - } - FLAC__ASSERT(first_frame_offset >= FLAC__stream_decoder_get_input_bytes_unconsumed(decoder->private_->stream_decoder)); - first_frame_offset -= FLAC__stream_decoder_get_input_bytes_unconsumed(decoder->private_->stream_decoder); - - /* - * First, we set an upper and lower bound on where in the - * stream we will search. For now we assume the worst case - * scenario, which is our best guess at the beginning of - * the first and last frames. - */ - lower_bound = first_frame_offset; - - /* calc the upper_bound, beyond which we never want to seek */ - if(decoder->private_->stream_info.max_framesize > 0) - upper_bound = stream_length - (decoder->private_->stream_info.max_framesize + 128 + 2); /* 128 for a possible ID3V1 tag, 2 for indexing differences */ - else - upper_bound = stream_length - ((decoder->private_->stream_info.channels * decoder->private_->stream_info.bits_per_sample * FLAC__MAX_BLOCK_SIZE) / 8 + 128 + 2); - - /* - * Now we refine the bounds if we have a seektable with - * suitable points. Note that according to the spec they - * must be ordered by ascending sample number. - */ - if(0 != decoder->private_->seek_table) { - /* find the closest seek point <= target_sample, if it exists */ - for(i = (int)decoder->private_->seek_table->num_points - 1; i >= 0; i--) { - if(decoder->private_->seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER && decoder->private_->seek_table->points[i].sample_number <= target_sample) - break; - } - if(i >= 0) { /* i.e. we found a suitable seek point... */ - lower_bound = first_frame_offset + decoder->private_->seek_table->points[i].stream_offset; - lower_seek_point = i; - } - - /* find the closest seek point > target_sample, if it exists */ - for(i = 0; i < (int)decoder->private_->seek_table->num_points; i++) { - if(decoder->private_->seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER && decoder->private_->seek_table->points[i].sample_number > target_sample) - break; - } - if(i < (int)decoder->private_->seek_table->num_points) { /* i.e. we found a suitable seek point... */ - upper_bound = first_frame_offset + decoder->private_->seek_table->points[i].stream_offset; - upper_seek_point = i; - } - } - - /* - * Now guess at where within those bounds our target - * sample will be. - */ - if(lower_seek_point >= 0) { - /* first see if our sample is within a few frames of the lower seekpoint */ - if(decoder->private_->seek_table->points[lower_seek_point].sample_number <= target_sample && target_sample < decoder->private_->seek_table->points[lower_seek_point].sample_number + (decoder->private_->seek_table->points[lower_seek_point].frame_samples * 4)) { - pos = (FLAC__int64)lower_bound; - } - else if(upper_seek_point >= 0) { - const FLAC__uint64 target_offset = target_sample - decoder->private_->seek_table->points[lower_seek_point].sample_number; - const FLAC__uint64 range_samples = decoder->private_->seek_table->points[upper_seek_point].sample_number - decoder->private_->seek_table->points[lower_seek_point].sample_number; - const FLAC__uint64 range_bytes = upper_bound - lower_bound; -#ifdef _MSC_VER - /* with VC++ you have to spoon feed it the casting */ - pos = (FLAC__int64)lower_bound + (FLAC__int64)((double)(FLAC__int64)target_offset / (double)(FLAC__int64)range_samples * (double)(FLAC__int64)(range_bytes-1)) - approx_bytes_per_frame; -#else - pos = (FLAC__int64)lower_bound + (FLAC__int64)((double)target_offset / (double)range_samples * (double)(range_bytes-1)) - approx_bytes_per_frame; -#endif - } - } - if(pos < 0) { - /* We need to use the metadata and the filelength to estimate the position of the frame with the correct sample */ -#ifdef _MSC_VER - /* with VC++ you have to spoon feed it the casting */ - pos = (FLAC__int64)first_frame_offset + (FLAC__int64)((double)(FLAC__int64)target_sample / (double)(FLAC__int64)decoder->private_->stream_info.total_samples * (double)(FLAC__int64)(stream_length-first_frame_offset-1)) - approx_bytes_per_frame; -#else - pos = (FLAC__int64)first_frame_offset + (FLAC__int64)((double)target_sample / (double)decoder->private_->stream_info.total_samples * (double)(stream_length-first_frame_offset-1)) - approx_bytes_per_frame; -#endif - } - - /* clip the position to the bounds, lower bound takes precedence */ - if(pos >= (FLAC__int64)upper_bound) - pos = (FLAC__int64)upper_bound-1; - if(pos < (FLAC__int64)lower_bound) - pos = (FLAC__int64)lower_bound; - needs_seek = true; - - decoder->private_->target_sample = target_sample; - while(1) { - if(needs_seek) { - if(decoder->private_->seek_callback(decoder, (FLAC__uint64)pos, decoder->private_->client_data) != FLAC__SEEKABLE_STREAM_DECODER_SEEK_STATUS_OK) { - decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR; - return false; - } - if(!FLAC__stream_decoder_flush(decoder->private_->stream_decoder)) { - decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_ERROR; - return false; - } - } - if(!FLAC__stream_decoder_process_one_frame(decoder->private_->stream_decoder)) { - decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR; - return false; - } - /* our write callback will change the state when it gets to the target frame */ - if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_SEEKING) { - break; - } - else { /* we need to narrow the search */ - FLAC__uint64 this_frame_sample = decoder->private_->last_frame.header.number.sample_number; - FLAC__ASSERT(decoder->private_->last_frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER); - if(this_frame_sample == last_frame_sample) { - /* our last move backwards wasn't big enough */ - pos -= (last_pos - pos); - needs_seek = true; - } - else { - if(target_sample < this_frame_sample) { - last_pos = pos; - approx_bytes_per_frame = decoder->private_->last_frame.header.blocksize * decoder->private_->last_frame.header.channels * decoder->private_->last_frame.header.bits_per_sample/8 + 64; - pos -= approx_bytes_per_frame; - needs_seek = true; - } - else { /* target_sample >= this_frame_sample + this frame's blocksize */ - last_pos = pos; - if(decoder->private_->tell_callback(decoder, (FLAC__uint64*)(&pos), decoder->private_->client_data) != FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_OK) { - decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR; - return false; - } - pos -= FLAC__stream_decoder_get_input_bytes_unconsumed(decoder->private_->stream_decoder); - needs_seek = false; - } - } - if(pos < (FLAC__int64)lower_bound) - pos = (FLAC__int64)lower_bound; - last_frame_sample = this_frame_sample; - } - } - - return true; -} +/* libFLAC - Free Lossless Audio Codec library + * Copyright (C) 2000,2001 Josh Coalson + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Library General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Library General Public License for more details. + * + * You should have received a copy of the GNU Library General Public + * License along with this library; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 02111-1307, USA. + */ + +#include +#include /* for malloc() */ +#include "FLAC/assert.h" +#include "protected/seekable_stream_decoder.h" +#include "protected/stream_decoder.h" +#include "private/md5.h" + +/*********************************************************************** + * + * Private class method prototypes + * + ***********************************************************************/ + +static FLAC__StreamDecoderReadStatus read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data); +static FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 *buffer[], void *client_data); +static void metadata_callback_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetaData *metadata, void *client_data); +static void error_callback_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data); +static FLAC__bool seek_to_absolute_sample_(FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample); + +/*********************************************************************** + * + * Private class data + * + ***********************************************************************/ + +typedef struct FLAC__SeekableStreamDecoderPrivate { + FLAC__SeekableStreamDecoderReadStatus (*read_callback)(const FLAC__SeekableStreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data); + FLAC__SeekableStreamDecoderSeekStatus (*seek_callback)(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data); + FLAC__SeekableStreamDecoderTellStatus (*tell_callback)(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data); + FLAC__SeekableStreamDecoderLengthStatus (*length_callback)(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data); + FLAC__bool (*eof_callback)(const FLAC__SeekableStreamDecoder *decoder, void *client_data); + FLAC__StreamDecoderWriteStatus (*write_callback)(const FLAC__SeekableStreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 *buffer[], void *client_data); + void (*metadata_callback)(const FLAC__SeekableStreamDecoder *decoder, const FLAC__StreamMetaData *metadata, void *client_data); + void (*error_callback)(const FLAC__SeekableStreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data); + void *client_data; + FLAC__StreamDecoder *stream_decoder; + struct MD5Context md5context; + FLAC__byte stored_md5sum[16]; /* this is what is stored in the metadata */ + FLAC__byte computed_md5sum[16]; /* this is the sum we computed from the decoded data */ + /* the rest of these are only used for seeking: */ + FLAC__StreamMetaData_StreamInfo stream_info; /* we keep this around so we can figure out how to seek quickly */ + const FLAC__StreamMetaData_SeekTable *seek_table; /* we hold a pointer to the stream decoder's seek table for the same reason */ + FLAC__Frame last_frame; /* holds the info of the last frame we seeked to */ + FLAC__uint64 target_sample; +} FLAC__SeekableStreamDecoderPrivate; + +/*********************************************************************** + * + * Public static class data + * + ***********************************************************************/ + +const char *FLAC__SeekableStreamDecoderStateString[] = { + "FLAC__SEEKABLE_STREAM_DECODER_OK", + "FLAC__SEEKABLE_STREAM_DECODER_SEEKING", + "FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM", + "FLAC__SEEKABLE_STREAM_DECODER_MEMORY_ALLOCATION_ERROR", + "FLAC__SEEKABLE_STREAM_DECODER_STREAM_ERROR", + "FLAC__SEEKABLE_STREAM_DECODER_READ_ERROR", + "FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR", + "FLAC__SEEKABLE_STREAM_DECODER_ALREADY_INITIALIZED", + "FLAC__SEEKABLE_STREAM_DECODER_INVALID_CALLBACK", + "FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED" +}; + +const char *FLAC__SeekableStreamDecoderReadStatusString[] = { + "FLAC__STREAM_DECODER_READ_STATUS_OK", + "FLAC__STREAM_DECODER_READ_STATUS_ERROR" +}; + +const char *FLAC__SeekableStreamDecoderSeekStatusString[] = { + "FLAC__STREAM_DECODER_SEEK_STATUS_OK", + "FLAC__STREAM_DECODER_SEEK_STATUS_ERROR" +}; + +const char *FLAC__SeekableStreamDecoderTellStatusString[] = { + "FLAC__STREAM_DECODER_TELL_STATUS_OK", + "FLAC__STREAM_DECODER_TELL_STATUS_ERROR" +}; + +const char *FLAC__SeekableStreamDecoderLengthStatusString[] = { + "FLAC__STREAM_DECODER_LENGTH_STATUS_OK", + "FLAC__STREAM_DECODER_LENGTH_STATUS_ERROR" +}; + +/*********************************************************************** + * + * Class constructor/destructor + * + ***********************************************************************/ + +FLAC__SeekableStreamDecoder *FLAC__seekable_stream_decoder_new() +{ + FLAC__SeekableStreamDecoder *decoder; + + FLAC__ASSERT(sizeof(int) >= 4); /* we want to die right away if this is not true */ + + decoder = (FLAC__SeekableStreamDecoder*)malloc(sizeof(FLAC__SeekableStreamDecoder)); + if(decoder == 0) { + return 0; + } + decoder->protected_ = (FLAC__SeekableStreamDecoderProtected*)malloc(sizeof(FLAC__SeekableStreamDecoderProtected)); + if(decoder->protected_ == 0) { + free(decoder); + return 0; + } + decoder->private_ = (FLAC__SeekableStreamDecoderPrivate*)malloc(sizeof(FLAC__SeekableStreamDecoderPrivate)); + if(decoder->private_ == 0) { + free(decoder->protected_); + free(decoder); + return 0; + } + + decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED; + + decoder->private_->read_callback = 0; + decoder->private_->seek_callback = 0; + decoder->private_->tell_callback = 0; + decoder->private_->length_callback = 0; + decoder->private_->eof_callback = 0; + decoder->private_->write_callback = 0; + decoder->private_->metadata_callback = 0; + decoder->private_->error_callback = 0; + decoder->private_->client_data = 0; + + return decoder; +} + +void FLAC__seekable_stream_decoder_delete(FLAC__SeekableStreamDecoder *decoder) +{ + FLAC__ASSERT(decoder != 0); + FLAC__ASSERT(decoder->protected_ != 0); + FLAC__ASSERT(decoder->private_ != 0); + + free(decoder->private_); + free(decoder->protected_); + free(decoder); +} + +/*********************************************************************** + * + * Public class methods + * + ***********************************************************************/ + +FLAC__SeekableStreamDecoderState FLAC__seekable_stream_decoder_init(FLAC__SeekableStreamDecoder *decoder) +{ + FLAC__ASSERT(decoder != 0); + + if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) + return decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_ALREADY_INITIALIZED; + + decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_OK; + + if(0 == decoder->private_->read_callback || 0 == decoder->private_->seek_callback || 0 == decoder->private_->tell_callback || 0 == decoder->private_->length_callback || 0 == decoder->private_->eof_callback) + return decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_INVALID_CALLBACK; + + if(0 == decoder->private_->write_callback || 0 == decoder->private_->metadata_callback || 0 == decoder->private_->error_callback) + return decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_INVALID_CALLBACK; + + decoder->private_->stream_decoder = 0; + decoder->private_->seek_table = 0; + + /* We initialize the MD5Context even though we may never use it. This is + * because md5_checking may be turned on to start and then turned off if a + * seek occurs. So we always init the context here and finalize it in + * FLAC__seekable_stream_decoder_finish() to make sure things are always + * cleaned up properly. + */ + MD5Init(&decoder->private_->md5context); + + decoder->private_->stream_decoder = FLAC__stream_decoder_new(); + + if(0 == decoder->private_->stream_decoder) + return decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_MEMORY_ALLOCATION_ERROR; + + FLAC__stream_decoder_set_read_callback(decoder->private_->stream_decoder, read_callback_); + FLAC__stream_decoder_set_write_callback(decoder->private_->stream_decoder, write_callback_); + FLAC__stream_decoder_set_metadata_callback(decoder->private_->stream_decoder, metadata_callback_); + FLAC__stream_decoder_set_error_callback(decoder->private_->stream_decoder, error_callback_); + FLAC__stream_decoder_set_client_data(decoder->private_->stream_decoder, decoder); + + if(FLAC__stream_decoder_init(decoder->private_->stream_decoder) != FLAC__STREAM_DECODER_SEARCH_FOR_METADATA) + return decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_ERROR; + + return decoder->protected_->state; +} + +FLAC__bool FLAC__seekable_stream_decoder_finish(FLAC__SeekableStreamDecoder *decoder) +{ + FLAC__bool md5_failed = false; + + FLAC__ASSERT(decoder != 0); + if(decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) + return true; + /* see the comment in FLAC__seekable_stream_decoder_init() as to why we + * always call MD5Final() + */ + MD5Final(decoder->private_->computed_md5sum, &decoder->private_->md5context); + if(decoder->private_->stream_decoder != 0) { + FLAC__stream_decoder_finish(decoder->private_->stream_decoder); + FLAC__stream_decoder_delete(decoder->private_->stream_decoder); + } + if(decoder->protected_->md5_checking) { + if(memcmp(decoder->private_->stored_md5sum, decoder->private_->computed_md5sum, 16)) + md5_failed = true; + } + decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED; + return !md5_failed; +} + +FLAC__bool FLAC__seekable_stream_decoder_set_md5_checking(const FLAC__SeekableStreamDecoder *decoder, FLAC__bool value) +{ + if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) + return false; + decoder->protected_->md5_checking = value; + return true; +} + +FLAC__bool FLAC__seekable_stream_decoder_set_read_callback(const FLAC__SeekableStreamDecoder *decoder, FLAC__SeekableStreamDecoderReadStatus (*value)(const FLAC__SeekableStreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data)) +{ + if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) + return false; + decoder->private_->read_callback = value; + return true; +} + +FLAC__bool FLAC__seekable_stream_decoder_set_seek_callback(const FLAC__SeekableStreamDecoder *decoder, FLAC__SeekableStreamDecoderSeekStatus (*value)(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data)) +{ + if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) + return false; + decoder->private_->seek_callback = value; + return true; +} + +FLAC__bool FLAC__seekable_stream_decoder_set_tell_callback(const FLAC__SeekableStreamDecoder *decoder, FLAC__SeekableStreamDecoderTellStatus (*value)(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data)) +{ + if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) + return false; + decoder->private_->tell_callback = value; + return true; +} + +FLAC__bool FLAC__seekable_stream_decoder_set_length_callback(const FLAC__SeekableStreamDecoder *decoder, FLAC__SeekableStreamDecoderLengthStatus (*value)(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data)) +{ + if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) + return false; + decoder->private_->length_callback = value; + return true; +} + +FLAC__bool FLAC__seekable_stream_decoder_set_eof_callback(const FLAC__SeekableStreamDecoder *decoder, FLAC__bool (*value)(const FLAC__SeekableStreamDecoder *decoder, void *client_data)) +{ + if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) + return false; + decoder->private_->eof_callback = value; + return true; +} + +FLAC__bool FLAC__seekable_stream_decoder_set_write_callback(const FLAC__SeekableStreamDecoder *decoder, FLAC__StreamDecoderWriteStatus (*value)(const FLAC__SeekableStreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 *buffer[], void *client_data)) +{ + if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) + return false; + decoder->private_->write_callback = value; + return true; +} + +FLAC__bool FLAC__seekable_stream_decoder_set_metadata_callback(const FLAC__SeekableStreamDecoder *decoder, void (*value)(const FLAC__SeekableStreamDecoder *decoder, const FLAC__StreamMetaData *metadata, void *client_data)) +{ + if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) + return false; + decoder->private_->metadata_callback = value; + return true; +} + +FLAC__bool FLAC__seekable_stream_decoder_set_error_callback(const FLAC__SeekableStreamDecoder *decoder, void (*value)(const FLAC__SeekableStreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)) +{ + if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) + return false; + decoder->private_->error_callback = value; + return true; +} + +FLAC__bool FLAC__seekable_stream_decoder_set_client_data(const FLAC__SeekableStreamDecoder *decoder, void *value) +{ + if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) + return false; + decoder->private_->client_data = value; + return true; +} + +FLAC__SeekableStreamDecoderState FLAC__seekable_stream_decoder_get_state(const FLAC__SeekableStreamDecoder *decoder) +{ + return decoder->protected_->state; +} + +FLAC__bool FLAC__seekable_stream_decoder_get_md5_checking(const FLAC__SeekableStreamDecoder *decoder) +{ + return decoder->protected_->md5_checking; +} + +FLAC__bool FLAC__seekable_stream_decoder_process_whole_stream(FLAC__SeekableStreamDecoder *decoder) +{ + FLAC__bool ret; + FLAC__ASSERT(decoder != 0); + + if(decoder->private_->stream_decoder->protected_->state == FLAC__STREAM_DECODER_END_OF_STREAM) + decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM; + + if(decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM) + return true; + + FLAC__ASSERT(decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_OK); + + ret = FLAC__stream_decoder_process_whole_stream(decoder->private_->stream_decoder); + if(!ret) + decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_ERROR; + + return ret; +} + +FLAC__bool FLAC__seekable_stream_decoder_process_metadata(FLAC__SeekableStreamDecoder *decoder) +{ + FLAC__bool ret; + FLAC__ASSERT(decoder != 0); + + if(decoder->private_->stream_decoder->protected_->state == FLAC__STREAM_DECODER_END_OF_STREAM) + decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM; + + if(decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM) + return true; + + FLAC__ASSERT(decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_OK); + + ret = FLAC__stream_decoder_process_metadata(decoder->private_->stream_decoder); + if(!ret) + decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_ERROR; + + return ret; +} + +FLAC__bool FLAC__seekable_stream_decoder_process_one_frame(FLAC__SeekableStreamDecoder *decoder) +{ + FLAC__bool ret; + FLAC__ASSERT(decoder != 0); + + if(decoder->private_->stream_decoder->protected_->state == FLAC__STREAM_DECODER_END_OF_STREAM) + decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM; + + if(decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM) + return true; + + FLAC__ASSERT(decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_OK); + + ret = FLAC__stream_decoder_process_one_frame(decoder->private_->stream_decoder); + if(!ret) + decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_ERROR; + + return ret; +} + +FLAC__bool FLAC__seekable_stream_decoder_process_remaining_frames(FLAC__SeekableStreamDecoder *decoder) +{ + FLAC__bool ret; + FLAC__ASSERT(decoder != 0); + + if(decoder->private_->stream_decoder->protected_->state == FLAC__STREAM_DECODER_END_OF_STREAM) + decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM; + + if(decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM) + return true; + + FLAC__ASSERT(decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_OK); + + ret = FLAC__stream_decoder_process_remaining_frames(decoder->private_->stream_decoder); + if(!ret) + decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_ERROR; + + return ret; +} + +FLAC__bool FLAC__seekable_stream_decoder_seek_absolute(FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 sample) +{ + FLAC__uint64 length; + + FLAC__ASSERT(decoder != 0); + FLAC__ASSERT(decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_OK); + + decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEKING; + + /* turn off md5 checking if a seek is attempted */ + decoder->protected_->md5_checking = false; + + if(!FLAC__stream_decoder_reset(decoder->private_->stream_decoder)) { + decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_ERROR; + return false; + } + /* get the file length */ + if(decoder->private_->length_callback(decoder, &length, decoder->private_->client_data) != FLAC__SEEKABLE_STREAM_DECODER_LENGTH_STATUS_OK) { + decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR; + return false; + } + /* rewind */ + if(decoder->private_->seek_callback(decoder, 0, decoder->private_->client_data) != FLAC__SEEKABLE_STREAM_DECODER_SEEK_STATUS_OK) { + decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR; + return false; + } + if(!FLAC__stream_decoder_process_metadata(decoder->private_->stream_decoder)) { + decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_ERROR; + return false; + } + if(sample > decoder->private_->stream_info.total_samples) { + decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR; + return false; + } + + return seek_to_absolute_sample_(decoder, length, sample); +} + +/*********************************************************************** + * + * Private class methods + * + ***********************************************************************/ + +FLAC__StreamDecoderReadStatus read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data) +{ + FLAC__SeekableStreamDecoder *seekable_stream_decoder = (FLAC__SeekableStreamDecoder *)client_data; + (void)decoder; + if(seekable_stream_decoder->private_->eof_callback(seekable_stream_decoder, seekable_stream_decoder->private_->client_data)) { + seekable_stream_decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM; + return FLAC__STREAM_DECODER_READ_END_OF_STREAM; + } + else if(*bytes > 0) { + unsigned bytes_read = *bytes; + if(seekable_stream_decoder->private_->read_callback(seekable_stream_decoder, buffer, &bytes_read, seekable_stream_decoder->private_->client_data) != FLAC__SEEKABLE_STREAM_DECODER_READ_STATUS_OK) { + seekable_stream_decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_READ_ERROR; + return FLAC__STREAM_DECODER_READ_ABORT; + } + if(bytes_read == 0) { + if(seekable_stream_decoder->private_->eof_callback(seekable_stream_decoder, seekable_stream_decoder->private_->client_data)) { + seekable_stream_decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM; + return FLAC__STREAM_DECODER_READ_END_OF_STREAM; + } + else + return FLAC__STREAM_DECODER_READ_CONTINUE; + } + else { + *bytes = bytes_read; + return FLAC__STREAM_DECODER_READ_CONTINUE; + } + } + else + return FLAC__STREAM_DECODER_READ_ABORT; /* abort to avoid a deadlock */ +} + +FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 *buffer[], void *client_data) +{ + FLAC__SeekableStreamDecoder *seekable_stream_decoder = (FLAC__SeekableStreamDecoder *)client_data; + (void)decoder; + + if(seekable_stream_decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_SEEKING) { + FLAC__uint64 this_frame_sample = frame->header.number.sample_number; + FLAC__uint64 next_frame_sample = this_frame_sample + (FLAC__uint64)frame->header.blocksize; + FLAC__uint64 target_sample = seekable_stream_decoder->private_->target_sample; + + FLAC__ASSERT(frame->header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER); + + seekable_stream_decoder->private_->last_frame = *frame; /* save the frame */ + if(this_frame_sample <= target_sample && target_sample < next_frame_sample) { /* we hit our target frame */ + unsigned delta = (unsigned)(target_sample - this_frame_sample); + /* kick out of seek mode */ + seekable_stream_decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_OK; + /* shift out the samples before target_sample */ + if(delta > 0) { + unsigned channel; + const FLAC__int32 *newbuffer[FLAC__MAX_CHANNELS]; + for(channel = 0; channel < frame->header.channels; channel++) + newbuffer[channel] = buffer[channel] + delta; + seekable_stream_decoder->private_->last_frame.header.blocksize -= delta; + seekable_stream_decoder->private_->last_frame.header.number.sample_number += (FLAC__uint64)delta; + /* write the relevant samples */ + return seekable_stream_decoder->private_->write_callback(seekable_stream_decoder, &seekable_stream_decoder->private_->last_frame, newbuffer, seekable_stream_decoder->private_->client_data); + } + else { + /* write the relevant samples */ + return seekable_stream_decoder->private_->write_callback(seekable_stream_decoder, frame, buffer, seekable_stream_decoder->private_->client_data); + } + } + else { + return FLAC__STREAM_DECODER_WRITE_CONTINUE; + } + } + else { + if(seekable_stream_decoder->protected_->md5_checking) { + if(!FLAC__MD5Accumulate(&seekable_stream_decoder->private_->md5context, buffer, frame->header.channels, frame->header.blocksize, (frame->header.bits_per_sample+7) / 8)) + return FLAC__STREAM_DECODER_WRITE_ABORT; + } + return seekable_stream_decoder->private_->write_callback(seekable_stream_decoder, frame, buffer, seekable_stream_decoder->private_->client_data); + } +} + +void metadata_callback_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetaData *metadata, void *client_data) +{ + FLAC__SeekableStreamDecoder *seekable_stream_decoder = (FLAC__SeekableStreamDecoder *)client_data; + (void)decoder; + + if(metadata->type == FLAC__METADATA_TYPE_STREAMINFO) { + seekable_stream_decoder->private_->stream_info = metadata->data.stream_info; + /* save the MD5 signature for comparison later */ + memcpy(seekable_stream_decoder->private_->stored_md5sum, metadata->data.stream_info.md5sum, 16); + if(0 == memcmp(seekable_stream_decoder->private_->stored_md5sum, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", 16)) + seekable_stream_decoder->protected_->md5_checking = false; + } + else if(metadata->type == FLAC__METADATA_TYPE_SEEKTABLE) { + seekable_stream_decoder->private_->seek_table = &metadata->data.seek_table; + } + + if(seekable_stream_decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_SEEKING) + seekable_stream_decoder->private_->metadata_callback(seekable_stream_decoder, metadata, seekable_stream_decoder->private_->client_data); +} + +void error_callback_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data) +{ + FLAC__SeekableStreamDecoder *seekable_stream_decoder = (FLAC__SeekableStreamDecoder *)client_data; + (void)decoder; + + if(seekable_stream_decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_SEEKING) + seekable_stream_decoder->private_->error_callback(seekable_stream_decoder, status, seekable_stream_decoder->private_->client_data); +} + +FLAC__bool seek_to_absolute_sample_(FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample) +{ + FLAC__uint64 first_frame_offset, lower_bound, upper_bound; + FLAC__int64 pos = -1, last_pos = -1; + int i, lower_seek_point = -1, upper_seek_point = -1; + unsigned approx_bytes_per_frame; + FLAC__uint64 last_frame_sample = 0xffffffffffffffff; + FLAC__bool needs_seek; + const FLAC__bool is_variable_blocksize_stream = (decoder->private_->stream_info.min_blocksize != decoder->private_->stream_info.max_blocksize); + + /* we are just guessing here, but we want to guess high, not low */ + if(decoder->private_->stream_info.max_framesize > 0) { + approx_bytes_per_frame = decoder->private_->stream_info.max_framesize; + } + else if(!is_variable_blocksize_stream) { + /* note there are no () around 'decoder->private_->stream_info.bits_per_sample/8' to keep precision up since it's an integer calulation */ + approx_bytes_per_frame = decoder->private_->stream_info.min_blocksize * decoder->private_->stream_info.channels * decoder->private_->stream_info.bits_per_sample/8 + 64; + } + else + approx_bytes_per_frame = 1152 * decoder->private_->stream_info.channels * decoder->private_->stream_info.bits_per_sample/8 + 64; + + /* + * The stream position is currently at the first frame plus any read + * ahead data, so first we get the stream position, then subtract + * uncomsumed bytes to get the position of the first frame in the + * stream. + */ + if(decoder->private_->tell_callback(decoder, &first_frame_offset, decoder->private_->client_data) != FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_OK) { + decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR; + return false; + } + FLAC__ASSERT(first_frame_offset >= FLAC__stream_decoder_get_input_bytes_unconsumed(decoder->private_->stream_decoder)); + first_frame_offset -= FLAC__stream_decoder_get_input_bytes_unconsumed(decoder->private_->stream_decoder); + + /* + * First, we set an upper and lower bound on where in the + * stream we will search. For now we assume the worst case + * scenario, which is our best guess at the beginning of + * the first and last frames. + */ + lower_bound = first_frame_offset; + + /* calc the upper_bound, beyond which we never want to seek */ + if(decoder->private_->stream_info.max_framesize > 0) + upper_bound = stream_length - (decoder->private_->stream_info.max_framesize + 128 + 2); /* 128 for a possible ID3V1 tag, 2 for indexing differences */ + else + upper_bound = stream_length - ((decoder->private_->stream_info.channels * decoder->private_->stream_info.bits_per_sample * FLAC__MAX_BLOCK_SIZE) / 8 + 128 + 2); + + /* + * Now we refine the bounds if we have a seektable with + * suitable points. Note that according to the spec they + * must be ordered by ascending sample number. + */ + if(0 != decoder->private_->seek_table) { + /* find the closest seek point <= target_sample, if it exists */ + for(i = (int)decoder->private_->seek_table->num_points - 1; i >= 0; i--) { + if(decoder->private_->seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER && decoder->private_->seek_table->points[i].sample_number <= target_sample) + break; + } + if(i >= 0) { /* i.e. we found a suitable seek point... */ + lower_bound = first_frame_offset + decoder->private_->seek_table->points[i].stream_offset; + lower_seek_point = i; + } + + /* find the closest seek point > target_sample, if it exists */ + for(i = 0; i < (int)decoder->private_->seek_table->num_points; i++) { + if(decoder->private_->seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER && decoder->private_->seek_table->points[i].sample_number > target_sample) + break; + } + if(i < (int)decoder->private_->seek_table->num_points) { /* i.e. we found a suitable seek point... */ + upper_bound = first_frame_offset + decoder->private_->seek_table->points[i].stream_offset; + upper_seek_point = i; + } + } + + /* + * Now guess at where within those bounds our target + * sample will be. + */ + if(lower_seek_point >= 0) { + /* first see if our sample is within a few frames of the lower seekpoint */ + if(decoder->private_->seek_table->points[lower_seek_point].sample_number <= target_sample && target_sample < decoder->private_->seek_table->points[lower_seek_point].sample_number + (decoder->private_->seek_table->points[lower_seek_point].frame_samples * 4)) { + pos = (FLAC__int64)lower_bound; + } + else if(upper_seek_point >= 0) { + const FLAC__uint64 target_offset = target_sample - decoder->private_->seek_table->points[lower_seek_point].sample_number; + const FLAC__uint64 range_samples = decoder->private_->seek_table->points[upper_seek_point].sample_number - decoder->private_->seek_table->points[lower_seek_point].sample_number; + const FLAC__uint64 range_bytes = upper_bound - lower_bound; +#ifdef _MSC_VER + /* with VC++ you have to spoon feed it the casting */ + pos = (FLAC__int64)lower_bound + (FLAC__int64)((double)(FLAC__int64)target_offset / (double)(FLAC__int64)range_samples * (double)(FLAC__int64)(range_bytes-1)) - approx_bytes_per_frame; +#else + pos = (FLAC__int64)lower_bound + (FLAC__int64)((double)target_offset / (double)range_samples * (double)(range_bytes-1)) - approx_bytes_per_frame; +#endif + } + } + if(pos < 0) { + /* We need to use the metadata and the filelength to estimate the position of the frame with the correct sample */ +#ifdef _MSC_VER + /* with VC++ you have to spoon feed it the casting */ + pos = (FLAC__int64)first_frame_offset + (FLAC__int64)((double)(FLAC__int64)target_sample / (double)(FLAC__int64)decoder->private_->stream_info.total_samples * (double)(FLAC__int64)(stream_length-first_frame_offset-1)) - approx_bytes_per_frame; +#else + pos = (FLAC__int64)first_frame_offset + (FLAC__int64)((double)target_sample / (double)decoder->private_->stream_info.total_samples * (double)(stream_length-first_frame_offset-1)) - approx_bytes_per_frame; +#endif + } + + /* clip the position to the bounds, lower bound takes precedence */ + if(pos >= (FLAC__int64)upper_bound) + pos = (FLAC__int64)upper_bound-1; + if(pos < (FLAC__int64)lower_bound) + pos = (FLAC__int64)lower_bound; + needs_seek = true; + + decoder->private_->target_sample = target_sample; + while(1) { + if(needs_seek) { + if(decoder->private_->seek_callback(decoder, (FLAC__uint64)pos, decoder->private_->client_data) != FLAC__SEEKABLE_STREAM_DECODER_SEEK_STATUS_OK) { + decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR; + return false; + } + if(!FLAC__stream_decoder_flush(decoder->private_->stream_decoder)) { + decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_ERROR; + return false; + } + } + if(!FLAC__stream_decoder_process_one_frame(decoder->private_->stream_decoder)) { + decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR; + return false; + } + /* our write callback will change the state when it gets to the target frame */ + if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_SEEKING) { + break; + } + else { /* we need to narrow the search */ + FLAC__uint64 this_frame_sample = decoder->private_->last_frame.header.number.sample_number; + FLAC__ASSERT(decoder->private_->last_frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER); + if(this_frame_sample == last_frame_sample) { + /* our last move backwards wasn't big enough */ + pos -= (last_pos - pos); + needs_seek = true; + } + else { + if(target_sample < this_frame_sample) { + last_pos = pos; + approx_bytes_per_frame = decoder->private_->last_frame.header.blocksize * decoder->private_->last_frame.header.channels * decoder->private_->last_frame.header.bits_per_sample/8 + 64; + pos -= approx_bytes_per_frame; + needs_seek = true; + } + else { /* target_sample >= this_frame_sample + this frame's blocksize */ + last_pos = pos; + if(decoder->private_->tell_callback(decoder, (FLAC__uint64*)(&pos), decoder->private_->client_data) != FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_OK) { + decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR; + return false; + } + pos -= FLAC__stream_decoder_get_input_bytes_unconsumed(decoder->private_->stream_decoder); + needs_seek = false; + } + } + if(pos < (FLAC__int64)lower_bound) + pos = (FLAC__int64)lower_bound; + last_frame_sample = this_frame_sample; + } + } + + return true; +} -- 2.7.4