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