-/* 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
+/* libFLAC - Free Lossless Audio Codec library
+ * Copyright (C) 2000,2001,2002 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 memcpy()/memcmp() */
+#include "FLAC/assert.h"
+#include "protected/seekable_stream_decoder.h"
+#include "protected/stream_decoder.h"
+#include "private/md5.h"
+
+/***********************************************************************
+ *
+ * Private class method prototypes
+ *
+ ***********************************************************************/
+
+static void set_defaults_(FLAC__SeekableStreamDecoder *decoder);
+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 * const 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__SeekableStreamDecoderReadCallback read_callback;
+ FLAC__SeekableStreamDecoderSeekCallback seek_callback;
+ FLAC__SeekableStreamDecoderTellCallback tell_callback;
+ FLAC__SeekableStreamDecoderLengthCallback length_callback;
+ FLAC__SeekableStreamDecoderEofCallback eof_callback;
+ FLAC__SeekableStreamDecoderWriteCallback write_callback;
+ FLAC__SeekableStreamDecoderMetadataCallback metadata_callback;
+ FLAC__SeekableStreamDecoderErrorCallback error_callback;
+ void *client_data;
+ FLAC__StreamDecoder *stream_decoder;
+ FLAC__bool do_md5_checking; /* initially gets protected_->md5_checking but is turned off after a seek */
+ 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 */
+ /* Since we always want to see the STREAMINFO and SEEK_TABLE blocks at this level, we need some extra flags to keep track of whether they should be passed on up through the metadata_callback */
+ FLAC__bool ignore_stream_info_block;
+ FLAC__bool ignore_seek_table_block;
+ 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 * const 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_DECODER_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 * const FLAC__SeekableStreamDecoderReadStatusString[] = {
+ "FLAC__SEEKABLE_STREAM_DECODER_READ_STATUS_OK",
+ "FLAC__SEEKABLE_STREAM_DECODER_READ_STATUS_ERROR"
+};
+
+const char * const FLAC__SeekableStreamDecoderSeekStatusString[] = {
+ "FLAC__SEEKABLE_STREAM_DECODER_SEEK_STATUS_OK",
+ "FLAC__SEEKABLE_STREAM_DECODER_SEEK_STATUS_ERROR"
+};
+
+const char * const FLAC__SeekableStreamDecoderTellStatusString[] = {
+ "FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_OK",
+ "FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_ERROR"
+};
+
+const char * const FLAC__SeekableStreamDecoderLengthStatusString[] = {
+ "FLAC__SEEKABLE_STREAM_DECODER_LENGTH_STATUS_OK",
+ "FLAC__SEEKABLE_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;
+ }
+ memset(decoder, 0, sizeof(FLAC__SeekableStreamDecoder));
+
+ decoder->protected_ = (FLAC__SeekableStreamDecoderProtected*)malloc(sizeof(FLAC__SeekableStreamDecoderProtected));
+ if(decoder->protected_ == 0) {
+ free(decoder);
+ return 0;
+ }
+ memset(decoder->protected_, 0, sizeof(FLAC__SeekableStreamDecoderProtected));
+
+ decoder->private_ = (FLAC__SeekableStreamDecoderPrivate*)malloc(sizeof(FLAC__SeekableStreamDecoderPrivate));
+ if(decoder->private_ == 0) {
+ free(decoder->protected_);
+ free(decoder);
+ return 0;
+ }
+ memset(decoder->private_, 0, sizeof(FLAC__SeekableStreamDecoderPrivate));
+
+ decoder->private_->stream_decoder = FLAC__stream_decoder_new();
+ if(0 == decoder->private_->stream_decoder) {
+ free(decoder->private_);
+ free(decoder->protected_);
+ free(decoder);
+ return 0;
+ }
+
+ set_defaults_(decoder);
+
+ decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED;
+
+ return decoder;
+}
+
+void FLAC__seekable_stream_decoder_delete(FLAC__SeekableStreamDecoder *decoder)
+{
+ FLAC__ASSERT(0 != decoder);
+ FLAC__ASSERT(0 != decoder->protected_);
+ FLAC__ASSERT(0 != decoder->private_);
+ FLAC__ASSERT(0 != decoder->private_->stream_decoder);
+
+ (void)FLAC__seekable_stream_decoder_finish(decoder);
+
+ FLAC__stream_decoder_delete(decoder->private_->stream_decoder);
+
+ free(decoder->private_);
+ free(decoder->protected_);
+ free(decoder);
+}
+
+/***********************************************************************
+ *
+ * Public class methods
+ *
+ ***********************************************************************/
+
+FLAC__SeekableStreamDecoderState FLAC__seekable_stream_decoder_init(FLAC__SeekableStreamDecoder *decoder)
+{
+ FLAC__ASSERT(0 != decoder);
+
+ if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED)
+ return decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_ALREADY_INITIALIZED;
+
+ 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_->seek_table = 0;
+
+ decoder->private_->do_md5_checking = decoder->protected_->md5_checking;
+
+ /* 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);
+
+ 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);
+
+ /* We always want to see these blocks. Whether or not we pass them up
+ * through the metadata callback will be determined by flags set in our
+ * implementation of ..._set_metadata_respond/ignore...()
+ */
+ FLAC__stream_decoder_set_metadata_respond(decoder->private_->stream_decoder, FLAC__METADATA_TYPE_STREAMINFO);
+ FLAC__stream_decoder_set_metadata_respond(decoder->private_->stream_decoder, FLAC__METADATA_TYPE_SEEKTABLE);
+
+ if(FLAC__stream_decoder_init(decoder->private_->stream_decoder) != FLAC__STREAM_DECODER_SEARCH_FOR_METADATA)
+ return decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR;
+
+ return decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_OK;
+}
+
+FLAC__bool FLAC__seekable_stream_decoder_finish(FLAC__SeekableStreamDecoder *decoder)
+{
+ FLAC__bool md5_failed = false;
+
+ FLAC__ASSERT(0 != decoder);
+ FLAC__ASSERT(0 != decoder->private_);
+ FLAC__ASSERT(0 != decoder->protected_);
+
+ if(decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED)
+ return true;
+
+ FLAC__ASSERT(0 != decoder->private_->stream_decoder);
+
+ /* see the comment in FLAC__seekable_stream_decoder_init() as to why we
+ * always call MD5Final()
+ */
+ MD5Final(decoder->private_->computed_md5sum, &decoder->private_->md5context);
+
+ FLAC__stream_decoder_finish(decoder->private_->stream_decoder);
+
+ if(decoder->private_->do_md5_checking) {
+ if(memcmp(decoder->private_->stored_md5sum, decoder->private_->computed_md5sum, 16))
+ md5_failed = true;
+ }
+
+ set_defaults_(decoder);
+
+ decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED;
+
+ return !md5_failed;
+}
+
+FLAC__bool FLAC__seekable_stream_decoder_set_md5_checking(FLAC__SeekableStreamDecoder *decoder, FLAC__bool value)
+{
+ FLAC__ASSERT(0 != decoder);
+ FLAC__ASSERT(0 != decoder->protected_);
+ 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(FLAC__SeekableStreamDecoder *decoder, FLAC__SeekableStreamDecoderReadCallback value)
+{
+ FLAC__ASSERT(0 != decoder);
+ FLAC__ASSERT(0 != decoder->private_);
+ FLAC__ASSERT(0 != decoder->protected_);
+ 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(FLAC__SeekableStreamDecoder *decoder, FLAC__SeekableStreamDecoderSeekCallback value)
+{
+ FLAC__ASSERT(0 != decoder);
+ FLAC__ASSERT(0 != decoder->private_);
+ FLAC__ASSERT(0 != decoder->protected_);
+ 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(FLAC__SeekableStreamDecoder *decoder, FLAC__SeekableStreamDecoderTellCallback value)
+{
+ FLAC__ASSERT(0 != decoder);
+ FLAC__ASSERT(0 != decoder->private_);
+ FLAC__ASSERT(0 != decoder->protected_);
+ 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(FLAC__SeekableStreamDecoder *decoder, FLAC__SeekableStreamDecoderLengthCallback value)
+{
+ FLAC__ASSERT(0 != decoder);
+ FLAC__ASSERT(0 != decoder->private_);
+ FLAC__ASSERT(0 != decoder->protected_);
+ 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(FLAC__SeekableStreamDecoder *decoder, FLAC__SeekableStreamDecoderEofCallback value)
+{
+ FLAC__ASSERT(0 != decoder);
+ FLAC__ASSERT(0 != decoder->private_);
+ FLAC__ASSERT(0 != decoder->protected_);
+ 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(FLAC__SeekableStreamDecoder *decoder, FLAC__SeekableStreamDecoderWriteCallback value)
+{
+ FLAC__ASSERT(0 != decoder);
+ FLAC__ASSERT(0 != decoder->private_);
+ FLAC__ASSERT(0 != decoder->protected_);
+ 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(FLAC__SeekableStreamDecoder *decoder, FLAC__SeekableStreamDecoderMetadataCallback value)
+{
+ FLAC__ASSERT(0 != decoder);
+ FLAC__ASSERT(0 != decoder->private_);
+ FLAC__ASSERT(0 != decoder->protected_);
+ 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(FLAC__SeekableStreamDecoder *decoder, FLAC__SeekableStreamDecoderErrorCallback value)
+{
+ FLAC__ASSERT(0 != decoder);
+ FLAC__ASSERT(0 != decoder->private_);
+ FLAC__ASSERT(0 != decoder->protected_);
+ 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(FLAC__SeekableStreamDecoder *decoder, void *value)
+{
+ FLAC__ASSERT(0 != decoder);
+ FLAC__ASSERT(0 != decoder->private_);
+ FLAC__ASSERT(0 != decoder->protected_);
+ if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED)
+ return false;
+ decoder->private_->client_data = value;
+ return true;
+}
+
+FLAC__bool FLAC__seekable_stream_decoder_set_metadata_respond(FLAC__SeekableStreamDecoder *decoder, FLAC__MetadataType type)
+{
+ FLAC__ASSERT(0 != decoder);
+ FLAC__ASSERT(0 != decoder->private_);
+ FLAC__ASSERT(0 != decoder->protected_);
+ FLAC__ASSERT(0 != decoder->private_->stream_decoder);
+ if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED)
+ return false;
+ if(type == FLAC__METADATA_TYPE_STREAMINFO)
+ decoder->private_->ignore_stream_info_block = false;
+ else if(type == FLAC__METADATA_TYPE_SEEKTABLE)
+ decoder->private_->ignore_seek_table_block = false;
+ return FLAC__stream_decoder_set_metadata_respond(decoder->private_->stream_decoder, type);
+}
+
+FLAC__bool FLAC__seekable_stream_decoder_set_metadata_respond_application(FLAC__SeekableStreamDecoder *decoder, const FLAC__byte id[4])
+{
+ FLAC__ASSERT(0 != decoder);
+ FLAC__ASSERT(0 != decoder->private_);
+ FLAC__ASSERT(0 != decoder->protected_);
+ FLAC__ASSERT(0 != decoder->private_->stream_decoder);
+ if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED)
+ return false;
+ return FLAC__stream_decoder_set_metadata_respond_application(decoder->private_->stream_decoder, id);
+}
+
+FLAC__bool FLAC__seekable_stream_decoder_set_metadata_respond_all(FLAC__SeekableStreamDecoder *decoder)
+{
+ FLAC__ASSERT(0 != decoder);
+ FLAC__ASSERT(0 != decoder->private_);
+ FLAC__ASSERT(0 != decoder->protected_);
+ FLAC__ASSERT(0 != decoder->private_->stream_decoder);
+ if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED)
+ return false;
+ decoder->private_->ignore_stream_info_block = false;
+ decoder->private_->ignore_seek_table_block = false;
+ return FLAC__stream_decoder_set_metadata_respond_all(decoder->private_->stream_decoder);
+}
+
+FLAC__bool FLAC__seekable_stream_decoder_set_metadata_ignore(FLAC__SeekableStreamDecoder *decoder, FLAC__MetadataType type)
+{
+ FLAC__ASSERT(0 != decoder);
+ FLAC__ASSERT(0 != decoder->private_);
+ FLAC__ASSERT(0 != decoder->protected_);
+ FLAC__ASSERT(0 != decoder->private_->stream_decoder);
+ if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED)
+ return false;
+ if(type == FLAC__METADATA_TYPE_STREAMINFO)
+ decoder->private_->ignore_stream_info_block = true;
+ else if(type == FLAC__METADATA_TYPE_SEEKTABLE)
+ decoder->private_->ignore_seek_table_block = true;
+ return FLAC__stream_decoder_set_metadata_ignore(decoder->private_->stream_decoder, type);
+}
+
+FLAC__bool FLAC__seekable_stream_decoder_set_metadata_ignore_application(FLAC__SeekableStreamDecoder *decoder, const FLAC__byte id[4])
+{
+ FLAC__ASSERT(0 != decoder);
+ FLAC__ASSERT(0 != decoder->private_);
+ FLAC__ASSERT(0 != decoder->protected_);
+ FLAC__ASSERT(0 != decoder->private_->stream_decoder);
+ if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED)
+ return false;
+ return FLAC__stream_decoder_set_metadata_ignore_application(decoder->private_->stream_decoder, id);
+}
+
+FLAC__bool FLAC__seekable_stream_decoder_set_metadata_ignore_all(FLAC__SeekableStreamDecoder *decoder)
+{
+ FLAC__ASSERT(0 != decoder);
+ FLAC__ASSERT(0 != decoder->private_);
+ FLAC__ASSERT(0 != decoder->protected_);
+ FLAC__ASSERT(0 != decoder->private_->stream_decoder);
+ if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED)
+ return false;
+ decoder->private_->ignore_stream_info_block = true;
+ decoder->private_->ignore_seek_table_block = true;
+ return FLAC__stream_decoder_set_metadata_ignore_all(decoder->private_->stream_decoder);
+}
+
+FLAC__SeekableStreamDecoderState FLAC__seekable_stream_decoder_get_state(const FLAC__SeekableStreamDecoder *decoder)
+{
+ FLAC__ASSERT(0 != decoder);
+ FLAC__ASSERT(0 != decoder->protected_);
+ return decoder->protected_->state;
+}
+
+FLAC__SeekableStreamDecoderState FLAC__seekable_stream_decoder_get_stream_decoder_state(const FLAC__SeekableStreamDecoder *decoder)
+{
+ FLAC__ASSERT(0 != decoder);
+ FLAC__ASSERT(0 != decoder->private_);
+ return FLAC__stream_decoder_get_state(decoder->private_->stream_decoder);
+}
+
+FLAC__bool FLAC__seekable_stream_decoder_get_md5_checking(const FLAC__SeekableStreamDecoder *decoder)
+{
+ FLAC__ASSERT(0 != decoder);
+ FLAC__ASSERT(0 != decoder->protected_);
+ return decoder->protected_->md5_checking;
+}
+
+unsigned FLAC__seekable_stream_decoder_get_channels(const FLAC__SeekableStreamDecoder *decoder)
+{
+ FLAC__ASSERT(0 != decoder);
+ FLAC__ASSERT(0 != decoder->private_);
+ return FLAC__stream_decoder_get_channels(decoder->private_->stream_decoder);
+}
+
+FLAC__ChannelAssignment FLAC__seekable_stream_decoder_get_channel_assignment(const FLAC__SeekableStreamDecoder *decoder)
+{
+ FLAC__ASSERT(0 != decoder);
+ FLAC__ASSERT(0 != decoder->private_);
+ return FLAC__stream_decoder_get_channel_assignment(decoder->private_->stream_decoder);
+}
+
+unsigned FLAC__seekable_stream_decoder_get_bits_per_sample(const FLAC__SeekableStreamDecoder *decoder)
+{
+ FLAC__ASSERT(0 != decoder);
+ FLAC__ASSERT(0 != decoder->private_);
+ return FLAC__stream_decoder_get_bits_per_sample(decoder->private_->stream_decoder);
+}
+
+unsigned FLAC__seekable_stream_decoder_get_sample_rate(const FLAC__SeekableStreamDecoder *decoder)
+{
+ FLAC__ASSERT(0 != decoder);
+ FLAC__ASSERT(0 != decoder->private_);
+ return FLAC__stream_decoder_get_sample_rate(decoder->private_->stream_decoder);
+}
+
+unsigned FLAC__seekable_stream_decoder_get_blocksize(const FLAC__SeekableStreamDecoder *decoder)
+{
+ FLAC__ASSERT(0 != decoder);
+ FLAC__ASSERT(0 != decoder->private_);
+ return FLAC__stream_decoder_get_blocksize(decoder->private_->stream_decoder);
+}
+
+FLAC__bool FLAC__seekable_stream_decoder_flush(FLAC__SeekableStreamDecoder *decoder)
+{
+ FLAC__ASSERT(0 != decoder);
+ FLAC__ASSERT(0 != decoder->private_);
+ FLAC__ASSERT(0 != decoder->protected_);
+
+ decoder->private_->do_md5_checking = false;
+
+ if(!FLAC__stream_decoder_flush(decoder->private_->stream_decoder)) {
+ decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR;
+ return false;
+ }
+
+ decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_OK;
+
+ return true;
+}
+
+FLAC__bool FLAC__seekable_stream_decoder_reset(FLAC__SeekableStreamDecoder *decoder)
+{
+ FLAC__ASSERT(0 != decoder);
+ FLAC__ASSERT(0 != decoder->private_);
+ FLAC__ASSERT(0 != decoder->protected_);
+
+ if(!FLAC__seekable_stream_decoder_flush(decoder)) {
+ decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR;
+ return false;
+ }
+
+ if(!FLAC__stream_decoder_reset(decoder->private_->stream_decoder)) {
+ decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR;
+ return false;
+ }
+
+ decoder->private_->seek_table = 0;
+
+ decoder->private_->do_md5_checking = decoder->protected_->md5_checking;
+
+ /* 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->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_OK;
+
+ return true;
+}
+
+FLAC__bool FLAC__seekable_stream_decoder_process_single(FLAC__SeekableStreamDecoder *decoder)
+{
+ FLAC__bool ret;
+ FLAC__ASSERT(0 != decoder);
+
+ 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_single(decoder->private_->stream_decoder);
+ if(!ret)
+ decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR;
+
+ return ret;
+}
+
+FLAC__bool FLAC__seekable_stream_decoder_process_until_end_of_metadata(FLAC__SeekableStreamDecoder *decoder)
+{
+ FLAC__bool ret;
+ FLAC__ASSERT(0 != decoder);
+
+ 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_until_end_of_metadata(decoder->private_->stream_decoder);
+ if(!ret)
+ decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR;
+
+ return ret;
+}
+
+FLAC__bool FLAC__seekable_stream_decoder_process_until_end_of_stream(FLAC__SeekableStreamDecoder *decoder)
+{
+ FLAC__bool ret;
+ FLAC__ASSERT(0 != decoder);
+
+ 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_until_end_of_stream(decoder->private_->stream_decoder);
+ if(!ret)
+ decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR;
+
+ return ret;
+}
+
+FLAC__bool FLAC__seekable_stream_decoder_seek_absolute(FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 sample)
+{
+ FLAC__uint64 length;
+
+ FLAC__ASSERT(0 != decoder);
+ FLAC__ASSERT(decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_OK || decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM);
+
+ decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEKING;
+
+ /* turn off md5 checking if a seek is attempted */
+ decoder->private_->do_md5_checking = false;
+
+ if(!FLAC__stream_decoder_reset(decoder->private_->stream_decoder)) {
+ decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_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_until_end_of_metadata(decoder->private_->stream_decoder)) {
+ decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR;
+ return false;
+ }
+ if(decoder->private_->stream_info.total_samples > 0 && 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
+ *
+ ***********************************************************************/
+
+void set_defaults_(FLAC__SeekableStreamDecoder *decoder)
+{
+ 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;
+ /* WATCHOUT: these should match the default behavior of FLAC__StreamDecoder */
+ decoder->private_->ignore_stream_info_block = false;
+ decoder->private_->ignore_seek_table_block = true;
+
+ decoder->protected_->md5_checking = false;
+}
+
+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_STATUS_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_STATUS_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_STATUS_END_OF_STREAM;
+ }
+ else
+ return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
+ }
+ else {
+ *bytes = bytes_read;
+ return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
+ }
+ }
+ else
+ return FLAC__STREAM_DECODER_READ_STATUS_ABORT; /* abort to avoid a deadlock */
+}
+
+FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const 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_STATUS_CONTINUE;
+ }
+ }
+ else {
+ if(seekable_stream_decoder->private_->do_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_STATUS_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->private_->do_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) {
+ FLAC__bool ignore_block = false;
+ if(metadata->type == FLAC__METADATA_TYPE_STREAMINFO && seekable_stream_decoder->private_->ignore_stream_info_block)
+ ignore_block = true;
+ else if(metadata->type == FLAC__METADATA_TYPE_SEEKTABLE && seekable_stream_decoder->private_->ignore_seek_table_block)
+ ignore_block = true;
+ if(!ignore_block)
+ 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__uint64 total_samples = decoder->private_->stream_info.total_samples;
+ const unsigned min_blocksize = decoder->private_->stream_info.min_blocksize;
+ const unsigned max_blocksize = decoder->private_->stream_info.max_blocksize;
+ const unsigned max_framesize = decoder->private_->stream_info.max_framesize;
+ const unsigned channels = FLAC__seekable_stream_decoder_get_channels(decoder);
+ const unsigned bps = FLAC__seekable_stream_decoder_get_bits_per_sample(decoder);
+
+ /* we are just guessing here, but we want to guess high, not low */
+ if(max_framesize > 0) {
+ approx_bytes_per_frame = max_framesize;
+ }
+ /*
+ * Check if it's a known fixed-blocksize stream. Note that though
+ * the spec doesn't allow zeroes in the STREAMINFO block, we may
+ * never get a STREAMINFO block when decoding so the value of
+ * min_blocksize might be zero.
+ */
+ else if(min_blocksize == max_blocksize && min_blocksize > 0) {
+ /* note there are no () around 'bps/8' to keep precision up since it's an integer calulation */
+ approx_bytes_per_frame = min_blocksize * channels * bps/8 + 64;
+ }
+ else
+ approx_bytes_per_frame = 4608 * channels * bps/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(max_framesize > 0)
+ upper_bound = stream_length - (max_framesize + 128 + 2); /* 128 for a possible ID3V1 tag, 2 for indexing differences */
+ else
+ upper_bound = stream_length - ((channels * bps * 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;
+#if defined _MSC_VER || defined __MINGW32__
+ /* 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 there's no seek table, we need to use the metadata (if we
+ * have it) and the filelength to estimate the position of the
+ * frame with the correct sample.
+ */
+ if(pos < 0 && total_samples > 0) {
+#if defined _MSC_VER || defined __MINGW32__
+ /* 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)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)total_samples * (double)(stream_length-first_frame_offset-1)) - approx_bytes_per_frame;
+#endif
+ }
+
+ /*
+ * If there's no seek table and total_samples is unknown, we
+ * don't even bother trying to figure out a target, we just use
+ * our current position.
+ */
+ if(pos < 0) {
+ FLAC__uint64 upos;
+ if(decoder->private_->tell_callback(decoder, &upos, decoder->private_->client_data) != FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_OK) {
+ decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR;
+ return false;
+ }
+ pos = (FLAC__int32)upos;
+ needs_seek = false;
+ }
+ else
+ needs_seek = true;
+
+ /* clip the position to the bounds, lower bound takes precedence */
+ if(pos >= (FLAC__int64)upper_bound) {
+ pos = (FLAC__int64)upper_bound-1;
+ needs_seek = true;
+ }
+ 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_DECODER_ERROR;
+ return false;
+ }
+ }
+ if(!FLAC__stream_decoder_process_single(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 * channels * bps/8 + 64;
+ pos -= approx_bytes_per_frame;
+ needs_seek = true;
+ }
+ else { /* target_sample >= this_frame_sample + this frame's blocksize */
+ FLAC__uint64 upos;
+ if(decoder->private_->tell_callback(decoder, &upos, decoder->private_->client_data) != FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_OK) {
+ decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR;
+ return false;
+ }
+ last_pos = pos;
+ pos = (FLAC__int32)upos;
+ 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;
+}
projects / platform / upstream / flac.git / blobdiff