From dbd84c48e5f35f424204307d1fb7003b3de88661 Mon Sep 17 00:00:00 2001 From: Josh Coalson Date: Thu, 8 Nov 2001 23:59:22 +0000 Subject: [PATCH] split most of FileDecoder off to new SeekableStreamDecoder --- include/FLAC/Makefile.am | 1 + include/FLAC/all.h | 1 + include/FLAC/file_decoder.h | 9 +- include/FLAC/seekable_stream_decoder.h | 167 +++ src/libFLAC/Makefile.am | 1 + src/libFLAC/Makefile.lite | 1 + src/libFLAC/Makefile.vc | 1 + src/libFLAC/file_decoder.c | 1155 +++++++---------- src/libFLAC/include/protected/Makefile.am | 1 + src/libFLAC/include/protected/all.h | 1 + src/libFLAC/include/protected/file_decoder.h | 1 - .../protected/seekable_stream_decoder.h | 30 + src/libFLAC/seekable_stream_decoder.c | 716 ++++++++++ 13 files changed, 1398 insertions(+), 687 deletions(-) create mode 100644 include/FLAC/seekable_stream_decoder.h create mode 100644 src/libFLAC/include/protected/seekable_stream_decoder.h create mode 100644 src/libFLAC/seekable_stream_decoder.c diff --git a/include/FLAC/Makefile.am b/include/FLAC/Makefile.am index 507099a8..df9f31fc 100644 --- a/include/FLAC/Makefile.am +++ b/include/FLAC/Makefile.am @@ -24,6 +24,7 @@ include_HEADERS = \ format.h \ ordinals.h \ seek_table.h \ + seekable_stream_decoder.h \ stream_decoder.h \ stream_encoder.h \ utility.h diff --git a/include/FLAC/all.h b/include/FLAC/all.h index 2c3ce60e..5120b3f3 100644 --- a/include/FLAC/all.h +++ b/include/FLAC/all.h @@ -25,6 +25,7 @@ #include "format.h" #include "ordinals.h" #include "seek_table.h" +#include "seekable_stream_decoder.h" #include "stream_decoder.h" #include "stream_encoder.h" #include "utility.h" diff --git a/include/FLAC/file_decoder.h b/include/FLAC/file_decoder.h index b2d94b63..d962f4e7 100644 --- a/include/FLAC/file_decoder.h +++ b/include/FLAC/file_decoder.h @@ -24,17 +24,18 @@ typedef enum { FLAC__FILE_DECODER_OK = 0, - FLAC__FILE_DECODER_SEEKING, + FLAC__FILE_DECODER_SEEKING, /*@@@ NOTE: unused; remove this in the next minor-version */ 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_MD5_ERROR, + FLAC__FILE_DECODER_MD5_ERROR, /*@@@ NOTE: unused; remove this in the next minor-version */ FLAC__FILE_DECODER_STREAM_DECODER_ERROR, FLAC__FILE_DECODER_ALREADY_INITIALIZED, FLAC__FILE_DECODER_INVALID_CALLBACK, - FLAC__FILE_DECODER_UNINITIALIZED + FLAC__FILE_DECODER_UNINITIALIZED, + FLAC__FILE_DECODER_SEEKABLE_STREAM_ERROR = FLAC__FILE_DECODER_STREAM_ERROR /*@@@ NOTE: do the actual replacement in the next minor-version */ } FLAC__FileDecoderState; extern const char *FLAC__FileDecoderStateString[]; @@ -111,7 +112,7 @@ FLAC__bool FLAC__file_decoder_get_md5_checking(const FLAC__FileDecoder *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__FILE_DECODER_OK - * if initializationsucceeded. + * if initialization succeeded. */ FLAC__FileDecoderState FLAC__file_decoder_init(FLAC__FileDecoder *decoder); diff --git a/include/FLAC/seekable_stream_decoder.h b/include/FLAC/seekable_stream_decoder.h new file mode 100644 index 00000000..337d0dc4 --- /dev/null +++ b/include/FLAC/seekable_stream_decoder.h @@ -0,0 +1,167 @@ +/* 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 diff --git a/src/libFLAC/Makefile.am b/src/libFLAC/Makefile.am index e6543eb7..49ef2225 100644 --- a/src/libFLAC/Makefile.am +++ b/src/libFLAC/Makefile.am @@ -52,6 +52,7 @@ libFLAC_la_SOURCES = \ md5.c \ memory.c \ seek_table.c \ + seekable_stream_decoder.c \ stream_decoder.c \ stream_encoder.c \ stream_encoder_framing.c \ diff --git a/src/libFLAC/Makefile.lite b/src/libFLAC/Makefile.lite index 2b719fe3..a684df6b 100644 --- a/src/libFLAC/Makefile.lite +++ b/src/libFLAC/Makefile.lite @@ -37,6 +37,7 @@ OBJS = \ md5.o \ memory.o \ seek_table.o \ + seekable_stream_decoder.o \ stream_decoder.o \ stream_encoder.o \ stream_encoder_framing.o \ diff --git a/src/libFLAC/Makefile.vc b/src/libFLAC/Makefile.vc index b5298c58..7adc789b 100644 --- a/src/libFLAC/Makefile.vc +++ b/src/libFLAC/Makefile.vc @@ -40,6 +40,7 @@ C_FILES= \ md5.c \ memory.c \ seek_table.c \ + seekable_stream_decoder.c \ stream_decoder.c \ stream_encoder.c \ stream_encoder_framing.c \ diff --git a/src/libFLAC/file_decoder.c b/src/libFLAC/file_decoder.c index a0806543..e0cf07e4 100644 --- a/src/libFLAC/file_decoder.c +++ b/src/libFLAC/file_decoder.c @@ -1,682 +1,473 @@ -/* libFLAC - Free Lossless Audio Codec library - * Copyright (C) 2000,2001 Josh Coalson - * - * This library is free software; you can redistribute it and/or - * modify it under the terms of the GNU Library General Public - * License as published by the Free Software Foundation; either - * version 2 of the License, or (at your option) any later version. - * - * This library is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Library General Public License for more details. - * - * You should have received a copy of the GNU Library General Public - * License along with this library; if not, write to the - * Free Software Foundation, Inc., 59 Temple Place - Suite 330, - * Boston, MA 02111-1307, USA. - */ - -#include -#include /* for malloc() */ -#include /* for strcmp() */ -#include /* for stat() */ -#include "FLAC/assert.h" -#include "protected/file_decoder.h" -#include "protected/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 + * Copyright (C) 2000,2001 Josh Coalson + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Library General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Library General Public License for more details. + * + * You should have received a copy of the GNU Library General Public + * License along with this library; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 02111-1307, USA. + */ + +#include +#include /* for malloc() */ +#include /* for strcmp() */ +#include /* for stat() */ +#include "FLAC/assert.h" +#include "protected/file_decoder.h" +#include "protected/seekable_stream_decoder.h" +#include "private/md5.h" + +/*********************************************************************** + * + * Private class method prototypes + * + ***********************************************************************/ + +static FLAC__SeekableStreamDecoderReadStatus read_callback_(const FLAC__SeekableStreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data); +static FLAC__SeekableStreamDecoderSeekStatus seek_callback_(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data); +static FLAC__SeekableStreamDecoderTellStatus tell_callback_(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data); +static FLAC__SeekableStreamDecoderLengthStatus length_callback_(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data); +static FLAC__bool eof_callback_(const FLAC__SeekableStreamDecoder *decoder, void *client_data); +static FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__SeekableStreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 *buffer[], void *client_data); +static void metadata_callback_(const FLAC__SeekableStreamDecoder *decoder, const FLAC__StreamMetaData *metadata, void *client_data); +static void error_callback_(const FLAC__SeekableStreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data); + +/*********************************************************************** + * + * Private class data + * + ***********************************************************************/ + +typedef struct FLAC__FileDecoderPrivate { + FLAC__StreamDecoderWriteStatus (*write_callback)(const FLAC__FileDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 *buffer[], void *client_data); + void (*metadata_callback)(const FLAC__FileDecoder *decoder, const FLAC__StreamMetaData *metadata, void *client_data); + void (*error_callback)(const FLAC__FileDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data); + void *client_data; + FILE *file; + char *filename; /* == NULL if stdin */ + FLAC__SeekableStreamDecoder *seekable_stream_decoder; + struct { + FLAC__bool md5_checking; + } init_values_for_superclass; +} FLAC__FileDecoderPrivate; + +/*********************************************************************** + * + * Public static class data + * + ***********************************************************************/ + +const char *FLAC__FileDecoderStateString[] = { + "FLAC__FILE_DECODER_OK", + "FLAC__FILE_DECODER_SEEKING", + "FLAC__FILE_DECODER_END_OF_FILE", + "FLAC__FILE_DECODER_ERROR_OPENING_FILE", + "FLAC__FILE_DECODER_MEMORY_ALLOCATION_ERROR", + "FLAC__FILE_DECODER_SEEK_ERROR", + "FLAC__FILE_DECODER_STREAM_ERROR", + "FLAC__FILE_DECODER_STREAM_DECODER_ERROR", + "FLAC__FILE_DECODER_ALREADY_INITIALIZED", + "FLAC__FILE_DECODER_INVALID_CALLBACK", + "FLAC__FILE_DECODER_UNINITIALIZED" +}; + +/*********************************************************************** + * + * Class constructor/destructor + * + ***********************************************************************/ + +FLAC__FileDecoder *FLAC__file_decoder_new() +{ + FLAC__FileDecoder *decoder; + + FLAC__ASSERT(sizeof(int) >= 4); /* we want to die right away if this is not true */ + + decoder = (FLAC__FileDecoder*)malloc(sizeof(FLAC__FileDecoder)); + if(decoder == 0) { + return 0; + } + decoder->protected_ = (FLAC__FileDecoderProtected*)malloc(sizeof(FLAC__FileDecoderProtected)); + if(decoder->protected_ == 0) { + free(decoder); + return 0; + } + decoder->private_ = (FLAC__FileDecoderPrivate*)malloc(sizeof(FLAC__FileDecoderPrivate)); + if(decoder->private_ == 0) { + free(decoder->protected_); + free(decoder); + return 0; + } + + decoder->protected_->state = FLAC__FILE_DECODER_UNINITIALIZED; + + decoder->private_->filename = 0; + decoder->private_->write_callback = 0; + decoder->private_->metadata_callback = 0; + decoder->private_->error_callback = 0; + decoder->private_->client_data = 0; + decoder->private_->init_values_for_superclass.md5_checking = false; + + return decoder; +} + +void FLAC__file_decoder_delete(FLAC__FileDecoder *decoder) +{ + FLAC__ASSERT(decoder != 0); + FLAC__ASSERT(decoder->protected_ != 0); + FLAC__ASSERT(decoder->private_ != 0); + + free(decoder->private_); + free(decoder->protected_); + free(decoder); +} + +/*********************************************************************** + * + * Public class methods + * + ***********************************************************************/ + +FLAC__FileDecoderState FLAC__file_decoder_init(FLAC__FileDecoder *decoder) +{ + FLAC__ASSERT(decoder != 0); + + if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED) + return decoder->protected_->state = FLAC__FILE_DECODER_ALREADY_INITIALIZED; + + decoder->protected_->state = FLAC__FILE_DECODER_OK; + + if(0 == decoder->private_->write_callback || 0 == decoder->private_->metadata_callback || 0 == decoder->private_->error_callback) + return decoder->protected_->state = FLAC__FILE_DECODER_INVALID_CALLBACK; + + decoder->private_->file = 0; + decoder->private_->seekable_stream_decoder = 0; + + if(0 == decoder->private_->filename) + decoder->private_->file = stdin; + else + decoder->private_->file = fopen(decoder->private_->filename, "rb"); + + if(decoder->private_->file == 0) + return decoder->protected_->state = FLAC__FILE_DECODER_ERROR_OPENING_FILE; + + decoder->private_->seekable_stream_decoder = FLAC__seekable_stream_decoder_new(); + + if(0 == decoder->private_->seekable_stream_decoder) + return decoder->protected_->state = FLAC__FILE_DECODER_MEMORY_ALLOCATION_ERROR; + + FLAC__seekable_stream_decoder_set_read_callback(decoder->private_->seekable_stream_decoder, read_callback_); + FLAC__seekable_stream_decoder_set_seek_callback(decoder->private_->seekable_stream_decoder, seek_callback_); + FLAC__seekable_stream_decoder_set_tell_callback(decoder->private_->seekable_stream_decoder, tell_callback_); + FLAC__seekable_stream_decoder_set_length_callback(decoder->private_->seekable_stream_decoder, length_callback_); + FLAC__seekable_stream_decoder_set_eof_callback(decoder->private_->seekable_stream_decoder, eof_callback_); + FLAC__seekable_stream_decoder_set_write_callback(decoder->private_->seekable_stream_decoder, write_callback_); + FLAC__seekable_stream_decoder_set_metadata_callback(decoder->private_->seekable_stream_decoder, metadata_callback_); + FLAC__seekable_stream_decoder_set_error_callback(decoder->private_->seekable_stream_decoder, error_callback_); + FLAC__seekable_stream_decoder_set_client_data(decoder->private_->seekable_stream_decoder, decoder); + + /* + * Unfortunately, because of the "_new() ... _set_() ... _init()" order of + * decoder initialization, settings that are 'inherited' from the superclass + * have to be passed up this way, because the superclass has not even been + * created yet when the value is set in the subclass. + */ + (void)FLAC__seekable_stream_decoder_set_md5_checking(decoder->private_->seekable_stream_decoder, decoder->private_->init_values_for_superclass.md5_checking); + + if(FLAC__seekable_stream_decoder_init(decoder->private_->seekable_stream_decoder) != FLAC__SEEKABLE_STREAM_DECODER_OK) + return decoder->protected_->state = FLAC__FILE_DECODER_STREAM_DECODER_ERROR; /*@@@ change this to FLAC__FILE_DECODER_SEEKABLE_STREAM_ERROR in next minor-revision */ + + return decoder->protected_->state; +} + +FLAC__bool FLAC__file_decoder_finish(FLAC__FileDecoder *decoder) +{ + FLAC__bool ok = true; + + FLAC__ASSERT(decoder != 0); + if(decoder->protected_->state == FLAC__FILE_DECODER_UNINITIALIZED) + return true; + if(decoder->private_->file != 0 && decoder->private_->file != stdin) + fclose(decoder->private_->file); + if(0 != decoder->private_->filename) + free(decoder->private_->filename); + if(decoder->private_->seekable_stream_decoder != 0) { + ok = FLAC__seekable_stream_decoder_finish(decoder->private_->seekable_stream_decoder); + FLAC__seekable_stream_decoder_delete(decoder->private_->seekable_stream_decoder); + } + decoder->protected_->state = FLAC__FILE_DECODER_UNINITIALIZED; + return ok; +} + +FLAC__bool FLAC__file_decoder_set_md5_checking(const FLAC__FileDecoder *decoder, FLAC__bool value) +{ + if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED) + return false; + decoder->private_->init_values_for_superclass.md5_checking = value; + return true; +} + +FLAC__bool FLAC__file_decoder_set_filename(const FLAC__FileDecoder *decoder, const char *value) +{ + FLAC__ASSERT(value != 0); + if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED) + return false; + if(0 != decoder->private_->filename) + free(decoder->private_->filename); + if(0 == strcmp(value, "-")) { + decoder->private_->filename = 0; + } + else { + if(0 == (decoder->private_->filename = (char*)malloc(strlen(value)+1))) { + decoder->protected_->state = FLAC__FILE_DECODER_MEMORY_ALLOCATION_ERROR; + return false; + } + strcpy(decoder->private_->filename, value); + } + return true; +} + +FLAC__bool FLAC__file_decoder_set_write_callback(const FLAC__FileDecoder *decoder, FLAC__StreamDecoderWriteStatus (*value)(const FLAC__FileDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 *buffer[], void *client_data)) +{ + if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED) + return false; + decoder->private_->write_callback = value; + return true; +} + +FLAC__bool FLAC__file_decoder_set_metadata_callback(const FLAC__FileDecoder *decoder, void (*value)(const FLAC__FileDecoder *decoder, const FLAC__StreamMetaData *metadata, void *client_data)) +{ + if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED) + return false; + decoder->private_->metadata_callback = value; + return true; +} + +FLAC__bool FLAC__file_decoder_set_error_callback(const FLAC__FileDecoder *decoder, void (*value)(const FLAC__FileDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)) +{ + if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED) + return false; + decoder->private_->error_callback = value; + return true; +} + +FLAC__bool FLAC__file_decoder_set_client_data(const FLAC__FileDecoder *decoder, void *value) +{ + if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED) + return false; + decoder->private_->client_data = value; + return true; +} + +FLAC__FileDecoderState FLAC__file_decoder_get_state(const FLAC__FileDecoder *decoder) +{ + return decoder->protected_->state; +} + +FLAC__bool FLAC__file_decoder_get_md5_checking(const FLAC__FileDecoder *decoder) +{ + return FLAC__seekable_stream_decoder_get_md5_checking(decoder->private_->seekable_stream_decoder); +} + +FLAC__bool FLAC__file_decoder_process_whole_file(FLAC__FileDecoder *decoder) +{ + FLAC__bool ret; + FLAC__ASSERT(decoder != 0); + + if(decoder->private_->seekable_stream_decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM) + decoder->protected_->state = FLAC__FILE_DECODER_END_OF_FILE; + + if(decoder->protected_->state == FLAC__FILE_DECODER_END_OF_FILE) + return true; + + FLAC__ASSERT(decoder->protected_->state == FLAC__FILE_DECODER_OK); + + ret = FLAC__seekable_stream_decoder_process_whole_stream(decoder->private_->seekable_stream_decoder); + if(!ret) + decoder->protected_->state = FLAC__FILE_DECODER_SEEKABLE_STREAM_ERROR; + + return ret; +} + +FLAC__bool FLAC__file_decoder_process_metadata(FLAC__FileDecoder *decoder) +{ + FLAC__bool ret; + FLAC__ASSERT(decoder != 0); + + if(decoder->private_->seekable_stream_decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM) + decoder->protected_->state = FLAC__FILE_DECODER_END_OF_FILE; + + if(decoder->protected_->state == FLAC__FILE_DECODER_END_OF_FILE) + return true; + + FLAC__ASSERT(decoder->protected_->state == FLAC__FILE_DECODER_OK); + + ret = FLAC__seekable_stream_decoder_process_metadata(decoder->private_->seekable_stream_decoder); + if(!ret) + decoder->protected_->state = FLAC__FILE_DECODER_SEEKABLE_STREAM_ERROR; + + return ret; +} + +FLAC__bool FLAC__file_decoder_process_one_frame(FLAC__FileDecoder *decoder) +{ + FLAC__bool ret; + FLAC__ASSERT(decoder != 0); + + if(decoder->private_->seekable_stream_decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM) + decoder->protected_->state = FLAC__FILE_DECODER_END_OF_FILE; + + if(decoder->protected_->state == FLAC__FILE_DECODER_END_OF_FILE) + return true; + + FLAC__ASSERT(decoder->protected_->state == FLAC__FILE_DECODER_OK); + + ret = FLAC__seekable_stream_decoder_process_one_frame(decoder->private_->seekable_stream_decoder); + if(!ret) + decoder->protected_->state = FLAC__FILE_DECODER_SEEKABLE_STREAM_ERROR; + + return ret; +} + +FLAC__bool FLAC__file_decoder_process_remaining_frames(FLAC__FileDecoder *decoder) +{ + FLAC__bool ret; + FLAC__ASSERT(decoder != 0); + + if(decoder->private_->seekable_stream_decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM) + decoder->protected_->state = FLAC__FILE_DECODER_END_OF_FILE; + + if(decoder->protected_->state == FLAC__FILE_DECODER_END_OF_FILE) + return true; + + FLAC__ASSERT(decoder->protected_->state == FLAC__FILE_DECODER_OK); + + ret = FLAC__seekable_stream_decoder_process_remaining_frames(decoder->private_->seekable_stream_decoder); + if(!ret) + decoder->protected_->state = FLAC__FILE_DECODER_SEEKABLE_STREAM_ERROR; + + return ret; +} + +/*********************************************************************** + * + * Private class methods + * + ***********************************************************************/ + +FLAC__bool FLAC__file_decoder_seek_absolute(FLAC__FileDecoder *decoder, FLAC__uint64 sample) +{ + FLAC__ASSERT(decoder != 0); + FLAC__ASSERT(decoder->protected_->state == FLAC__FILE_DECODER_OK); + + if(decoder->private_->filename == 0) { /* means the file is stdin... */ + decoder->protected_->state = FLAC__FILE_DECODER_SEEK_ERROR; + return false; + } + + if(!FLAC__seekable_stream_decoder_seek_absolute(decoder->private_->seekable_stream_decoder, sample)) { + decoder->protected_->state = FLAC__FILE_DECODER_SEEK_ERROR; + return false; + } + else + return true; +} + +FLAC__SeekableStreamDecoderReadStatus read_callback_(const FLAC__SeekableStreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data) +{ + FLAC__FileDecoder *file_decoder = (FLAC__FileDecoder *)client_data; + (void)decoder; + + if(*bytes > 0) { + size_t bytes_read = fread(buffer, sizeof(FLAC__byte), *bytes, file_decoder->private_->file); + if(bytes_read == 0 && !feof(file_decoder->private_->file)) { + return FLAC__SEEKABLE_STREAM_DECODER_READ_STATUS_ERROR; + } + else { + *bytes = (unsigned)bytes_read; + return FLAC__SEEKABLE_STREAM_DECODER_READ_STATUS_OK; + } + } + else + return FLAC__SEEKABLE_STREAM_DECODER_READ_STATUS_ERROR; /* abort to avoid a deadlock */ +} + +FLAC__SeekableStreamDecoderSeekStatus seek_callback_(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data) +{ + FLAC__FileDecoder *file_decoder = (FLAC__FileDecoder *)client_data; + (void)decoder; + + if(fseek(file_decoder->private_->file, (long)absolute_byte_offset, SEEK_SET) < 0) + return FLAC__SEEKABLE_STREAM_DECODER_SEEK_STATUS_ERROR; + else + return FLAC__SEEKABLE_STREAM_DECODER_SEEK_STATUS_OK; +} + +FLAC__SeekableStreamDecoderTellStatus tell_callback_(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data) +{ + FLAC__FileDecoder *file_decoder = (FLAC__FileDecoder *)client_data; + long pos; + (void)decoder; + + if((pos = ftell(file_decoder->private_->file)) < 0) + return FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_ERROR; + else { + *absolute_byte_offset = (FLAC__uint64)pos; + return FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_OK; + } +} + +FLAC__SeekableStreamDecoderLengthStatus length_callback_(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data) +{ + FLAC__FileDecoder *file_decoder = (FLAC__FileDecoder *)client_data; + struct stat filestats; + (void)decoder; + + if(stat(file_decoder->private_->filename, &filestats) != 0) + return FLAC__SEEKABLE_STREAM_DECODER_LENGTH_STATUS_ERROR; + else { + *stream_length = (FLAC__uint64)filestats.st_size; + return FLAC__SEEKABLE_STREAM_DECODER_LENGTH_STATUS_OK; + } +} + +FLAC__bool eof_callback_(const FLAC__SeekableStreamDecoder *decoder, void *client_data) +{ + FLAC__FileDecoder *file_decoder = (FLAC__FileDecoder *)client_data; + (void)decoder; + + return feof(file_decoder->private_->file); +} + +FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__SeekableStreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 *buffer[], void *client_data) +{ + FLAC__FileDecoder *file_decoder = (FLAC__FileDecoder *)client_data; + (void)decoder; + + return file_decoder->private_->write_callback(file_decoder, frame, buffer, file_decoder->private_->client_data); +} + +void metadata_callback_(const FLAC__SeekableStreamDecoder *decoder, const FLAC__StreamMetaData *metadata, void *client_data) +{ + FLAC__FileDecoder *file_decoder = (FLAC__FileDecoder *)client_data; + (void)decoder; + + file_decoder->private_->metadata_callback(file_decoder, metadata, file_decoder->private_->client_data); +} + +void error_callback_(const FLAC__SeekableStreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data) +{ + FLAC__FileDecoder *file_decoder = (FLAC__FileDecoder *)client_data; + (void)decoder; + + file_decoder->private_->error_callback(file_decoder, status, file_decoder->private_->client_data); +} diff --git a/src/libFLAC/include/protected/Makefile.am b/src/libFLAC/include/protected/Makefile.am index a9f7b558..992ce251 100644 --- a/src/libFLAC/include/protected/Makefile.am +++ b/src/libFLAC/include/protected/Makefile.am @@ -18,5 +18,6 @@ noinst_HEADERS = \ file_decoder.h \ + seekable_stream_decoder.h \ stream_decoder.h \ stream_encoder.h diff --git a/src/libFLAC/include/protected/all.h b/src/libFLAC/include/protected/all.h index 52733dde..2ad3d9d3 100644 --- a/src/libFLAC/include/protected/all.h +++ b/src/libFLAC/include/protected/all.h @@ -21,6 +21,7 @@ #define FLAC__PROTECTED__ALL_H #include "file_decoder.h" +#include "seekable_stream_decoder.h" #include "stream_decoder.h" #include "stream_encoder.h" diff --git a/src/libFLAC/include/protected/file_decoder.h b/src/libFLAC/include/protected/file_decoder.h index 3e9761a8..f3a22d34 100644 --- a/src/libFLAC/include/protected/file_decoder.h +++ b/src/libFLAC/include/protected/file_decoder.h @@ -23,7 +23,6 @@ #include "FLAC/file_decoder.h" typedef struct FLAC__FileDecoderProtected { - FLAC__bool md5_checking; /* if true, generate MD5 signature of decoded data and compare against signature in the Encoding metadata block */ FLAC__FileDecoderState state; } FLAC__FileDecoderProtected; diff --git a/src/libFLAC/include/protected/seekable_stream_decoder.h b/src/libFLAC/include/protected/seekable_stream_decoder.h new file mode 100644 index 00000000..3a8e5a5c --- /dev/null +++ b/src/libFLAC/include/protected/seekable_stream_decoder.h @@ -0,0 +1,30 @@ +/* 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__PROTECTED__SEEKABLE_STREAM_DECODER_H +#define FLAC__PROTECTED__SEEKABLE_STREAM_DECODER_H + +#include "FLAC/seekable_stream_decoder.h" + +typedef struct FLAC__SeekableStreamDecoderProtected { + FLAC__bool md5_checking; /* if true, generate MD5 signature of decoded data and compare against signature in the Encoding metadata block */ + FLAC__SeekableStreamDecoderState state; +} FLAC__SeekableStreamDecoderProtected; + +#endif diff --git a/src/libFLAC/seekable_stream_decoder.c b/src/libFLAC/seekable_stream_decoder.c new file mode 100644 index 00000000..78ade182 --- /dev/null +++ b/src/libFLAC/seekable_stream_decoder.c @@ -0,0 +1,716 @@ +/* libFLAC - Free Lossless Audio Codec library + * Copyright (C) 2000,2001 Josh Coalson + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Library General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Library General Public License for more details. + * + * You should have received a copy of the GNU Library General Public + * License along with this library; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 02111-1307, USA. + */ + +#include +#include /* for malloc() */ +#include "FLAC/assert.h" +#include "protected/seekable_stream_decoder.h" +#include "protected/stream_decoder.h" +#include "private/md5.h" + +/*********************************************************************** + * + * Private class method prototypes + * + ***********************************************************************/ + +static FLAC__StreamDecoderReadStatus read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data); +static FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 *buffer[], void *client_data); +static void metadata_callback_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetaData *metadata, void *client_data); +static void error_callback_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data); +static FLAC__bool seek_to_absolute_sample_(FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample); + +/*********************************************************************** + * + * Private class data + * + ***********************************************************************/ + +typedef struct FLAC__SeekableStreamDecoderPrivate { + FLAC__SeekableStreamDecoderReadStatus (*read_callback)(const FLAC__SeekableStreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data); + FLAC__SeekableStreamDecoderSeekStatus (*seek_callback)(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data); + FLAC__SeekableStreamDecoderTellStatus (*tell_callback)(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data); + FLAC__SeekableStreamDecoderLengthStatus (*length_callback)(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data); + FLAC__bool (*eof_callback)(const FLAC__SeekableStreamDecoder *decoder, void *client_data); + FLAC__StreamDecoderWriteStatus (*write_callback)(const FLAC__SeekableStreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 *buffer[], void *client_data); + void (*metadata_callback)(const FLAC__SeekableStreamDecoder *decoder, const FLAC__StreamMetaData *metadata, void *client_data); + void (*error_callback)(const FLAC__SeekableStreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data); + void *client_data; + FLAC__StreamDecoder *stream_decoder; + struct MD5Context md5context; + FLAC__byte stored_md5sum[16]; /* this is what is stored in the metadata */ + FLAC__byte computed_md5sum[16]; /* this is the sum we computed from the decoded data */ + /* the rest of these are only used for seeking: */ + FLAC__StreamMetaData_StreamInfo stream_info; /* we keep this around so we can figure out how to seek quickly */ + const FLAC__StreamMetaData_SeekTable *seek_table; /* we hold a pointer to the stream decoder's seek table for the same reason */ + FLAC__Frame last_frame; /* holds the info of the last frame we seeked to */ + FLAC__uint64 target_sample; +} FLAC__SeekableStreamDecoderPrivate; + +/*********************************************************************** + * + * Public static class data + * + ***********************************************************************/ + +const char *FLAC__SeekableStreamDecoderStateString[] = { + "FLAC__SEEKABLE_STREAM_DECODER_OK", + "FLAC__SEEKABLE_STREAM_DECODER_SEEKING", + "FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM", + "FLAC__SEEKABLE_STREAM_DECODER_MEMORY_ALLOCATION_ERROR", + "FLAC__SEEKABLE_STREAM_DECODER_STREAM_ERROR", + "FLAC__SEEKABLE_STREAM_DECODER_READ_ERROR", + "FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR", + "FLAC__SEEKABLE_STREAM_DECODER_ALREADY_INITIALIZED", + "FLAC__SEEKABLE_STREAM_DECODER_INVALID_CALLBACK", + "FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED" +}; + +const char *FLAC__SeekableStreamDecoderReadStatusString[] = { + "FLAC__STREAM_DECODER_READ_STATUS_OK", + "FLAC__STREAM_DECODER_READ_STATUS_ERROR" +}; + +const char *FLAC__SeekableStreamDecoderSeekStatusString[] = { + "FLAC__STREAM_DECODER_SEEK_STATUS_OK", + "FLAC__STREAM_DECODER_SEEK_STATUS_ERROR" +}; + +const char *FLAC__SeekableStreamDecoderTellStatusString[] = { + "FLAC__STREAM_DECODER_TELL_STATUS_OK", + "FLAC__STREAM_DECODER_TELL_STATUS_ERROR" +}; + +const char *FLAC__SeekableStreamDecoderLengthStatusString[] = { + "FLAC__STREAM_DECODER_LENGTH_STATUS_OK", + "FLAC__STREAM_DECODER_LENGTH_STATUS_ERROR" +}; + +/*********************************************************************** + * + * Class constructor/destructor + * + ***********************************************************************/ + +FLAC__SeekableStreamDecoder *FLAC__seekable_stream_decoder_new() +{ + FLAC__SeekableStreamDecoder *decoder; + + FLAC__ASSERT(sizeof(int) >= 4); /* we want to die right away if this is not true */ + + decoder = (FLAC__SeekableStreamDecoder*)malloc(sizeof(FLAC__SeekableStreamDecoder)); + if(decoder == 0) { + return 0; + } + decoder->protected_ = (FLAC__SeekableStreamDecoderProtected*)malloc(sizeof(FLAC__SeekableStreamDecoderProtected)); + if(decoder->protected_ == 0) { + free(decoder); + return 0; + } + decoder->private_ = (FLAC__SeekableStreamDecoderPrivate*)malloc(sizeof(FLAC__SeekableStreamDecoderPrivate)); + if(decoder->private_ == 0) { + free(decoder->protected_); + free(decoder); + return 0; + } + + decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED; + + decoder->private_->read_callback = 0; + decoder->private_->seek_callback = 0; + decoder->private_->tell_callback = 0; + decoder->private_->length_callback = 0; + decoder->private_->eof_callback = 0; + decoder->private_->write_callback = 0; + decoder->private_->metadata_callback = 0; + decoder->private_->error_callback = 0; + decoder->private_->client_data = 0; + + return decoder; +} + +void FLAC__seekable_stream_decoder_delete(FLAC__SeekableStreamDecoder *decoder) +{ + FLAC__ASSERT(decoder != 0); + FLAC__ASSERT(decoder->protected_ != 0); + FLAC__ASSERT(decoder->private_ != 0); + + free(decoder->private_); + free(decoder->protected_); + free(decoder); +} + +/*********************************************************************** + * + * Public class methods + * + ***********************************************************************/ + +FLAC__SeekableStreamDecoderState FLAC__seekable_stream_decoder_init(FLAC__SeekableStreamDecoder *decoder) +{ + FLAC__ASSERT(decoder != 0); + + if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) + return decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_ALREADY_INITIALIZED; + + decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_OK; + + if(0 == decoder->private_->read_callback || 0 == decoder->private_->seek_callback || 0 == decoder->private_->tell_callback || 0 == decoder->private_->length_callback || 0 == decoder->private_->eof_callback) + return decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_INVALID_CALLBACK; + + if(0 == decoder->private_->write_callback || 0 == decoder->private_->metadata_callback || 0 == decoder->private_->error_callback) + return decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_INVALID_CALLBACK; + + decoder->private_->stream_decoder = 0; + decoder->private_->seek_table = 0; + + /* We initialize the MD5Context even though we may never use it. This is + * because md5_checking may be turned on to start and then turned off if a + * seek occurs. So we always init the context here and finalize it in + * FLAC__seekable_stream_decoder_finish() to make sure things are always + * cleaned up properly. + */ + MD5Init(&decoder->private_->md5context); + + decoder->private_->stream_decoder = FLAC__stream_decoder_new(); + + if(0 == decoder->private_->stream_decoder) + return decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_MEMORY_ALLOCATION_ERROR; + + FLAC__stream_decoder_set_read_callback(decoder->private_->stream_decoder, read_callback_); + FLAC__stream_decoder_set_write_callback(decoder->private_->stream_decoder, write_callback_); + FLAC__stream_decoder_set_metadata_callback(decoder->private_->stream_decoder, metadata_callback_); + FLAC__stream_decoder_set_error_callback(decoder->private_->stream_decoder, error_callback_); + FLAC__stream_decoder_set_client_data(decoder->private_->stream_decoder, decoder); + + if(FLAC__stream_decoder_init(decoder->private_->stream_decoder) != FLAC__STREAM_DECODER_SEARCH_FOR_METADATA) + return decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_ERROR; + + return decoder->protected_->state; +} + +FLAC__bool FLAC__seekable_stream_decoder_finish(FLAC__SeekableStreamDecoder *decoder) +{ + FLAC__bool md5_failed = false; + + FLAC__ASSERT(decoder != 0); + if(decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) + return true; + /* see the comment in FLAC__seekable_stream_decoder_init() as to why we + * always call MD5Final() + */ + MD5Final(decoder->private_->computed_md5sum, &decoder->private_->md5context); + if(decoder->private_->stream_decoder != 0) { + FLAC__stream_decoder_finish(decoder->private_->stream_decoder); + FLAC__stream_decoder_delete(decoder->private_->stream_decoder); + } + if(decoder->protected_->md5_checking) { + if(memcmp(decoder->private_->stored_md5sum, decoder->private_->computed_md5sum, 16)) + md5_failed = true; + } + decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED; + return !md5_failed; +} + +FLAC__bool FLAC__seekable_stream_decoder_set_md5_checking(const FLAC__SeekableStreamDecoder *decoder, FLAC__bool value) +{ + if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) + return false; + decoder->protected_->md5_checking = value; + return true; +} + +FLAC__bool FLAC__seekable_stream_decoder_set_read_callback(const FLAC__SeekableStreamDecoder *decoder, FLAC__SeekableStreamDecoderReadStatus (*value)(const FLAC__SeekableStreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data)) +{ + if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) + return false; + decoder->private_->read_callback = value; + return true; +} + +FLAC__bool FLAC__seekable_stream_decoder_set_seek_callback(const FLAC__SeekableStreamDecoder *decoder, FLAC__SeekableStreamDecoderSeekStatus (*value)(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data)) +{ + if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) + return false; + decoder->private_->seek_callback = value; + return true; +} + +FLAC__bool FLAC__seekable_stream_decoder_set_tell_callback(const FLAC__SeekableStreamDecoder *decoder, FLAC__SeekableStreamDecoderTellStatus (*value)(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data)) +{ + if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) + return false; + decoder->private_->tell_callback = value; + return true; +} + +FLAC__bool FLAC__seekable_stream_decoder_set_length_callback(const FLAC__SeekableStreamDecoder *decoder, FLAC__SeekableStreamDecoderLengthStatus (*value)(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data)) +{ + if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) + return false; + decoder->private_->length_callback = value; + return true; +} + +FLAC__bool FLAC__seekable_stream_decoder_set_eof_callback(const FLAC__SeekableStreamDecoder *decoder, FLAC__bool (*value)(const FLAC__SeekableStreamDecoder *decoder, void *client_data)) +{ + if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) + return false; + decoder->private_->eof_callback = value; + return true; +} + +FLAC__bool FLAC__seekable_stream_decoder_set_write_callback(const FLAC__SeekableStreamDecoder *decoder, FLAC__StreamDecoderWriteStatus (*value)(const FLAC__SeekableStreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 *buffer[], void *client_data)) +{ + if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) + return false; + decoder->private_->write_callback = value; + return true; +} + +FLAC__bool FLAC__seekable_stream_decoder_set_metadata_callback(const FLAC__SeekableStreamDecoder *decoder, void (*value)(const FLAC__SeekableStreamDecoder *decoder, const FLAC__StreamMetaData *metadata, void *client_data)) +{ + if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) + return false; + decoder->private_->metadata_callback = value; + return true; +} + +FLAC__bool FLAC__seekable_stream_decoder_set_error_callback(const FLAC__SeekableStreamDecoder *decoder, void (*value)(const FLAC__SeekableStreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)) +{ + if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) + return false; + decoder->private_->error_callback = value; + return true; +} + +FLAC__bool FLAC__seekable_stream_decoder_set_client_data(const FLAC__SeekableStreamDecoder *decoder, void *value) +{ + if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) + return false; + decoder->private_->client_data = value; + return true; +} + +FLAC__SeekableStreamDecoderState FLAC__seekable_stream_decoder_get_state(const FLAC__SeekableStreamDecoder *decoder) +{ + return decoder->protected_->state; +} + +FLAC__bool FLAC__seekable_stream_decoder_get_md5_checking(const FLAC__SeekableStreamDecoder *decoder) +{ + return decoder->protected_->md5_checking; +} + +FLAC__bool FLAC__seekable_stream_decoder_process_whole_stream(FLAC__SeekableStreamDecoder *decoder) +{ + FLAC__bool ret; + FLAC__ASSERT(decoder != 0); + + if(decoder->private_->stream_decoder->protected_->state == FLAC__STREAM_DECODER_END_OF_STREAM) + decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM; + + if(decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM) + return true; + + FLAC__ASSERT(decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_OK); + + ret = FLAC__stream_decoder_process_whole_stream(decoder->private_->stream_decoder); + if(!ret) + decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_ERROR; + + return ret; +} + +FLAC__bool FLAC__seekable_stream_decoder_process_metadata(FLAC__SeekableStreamDecoder *decoder) +{ + FLAC__bool ret; + FLAC__ASSERT(decoder != 0); + + if(decoder->private_->stream_decoder->protected_->state == FLAC__STREAM_DECODER_END_OF_STREAM) + decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM; + + if(decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM) + return true; + + FLAC__ASSERT(decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_OK); + + ret = FLAC__stream_decoder_process_metadata(decoder->private_->stream_decoder); + if(!ret) + decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_ERROR; + + return ret; +} + +FLAC__bool FLAC__seekable_stream_decoder_process_one_frame(FLAC__SeekableStreamDecoder *decoder) +{ + FLAC__bool ret; + FLAC__ASSERT(decoder != 0); + + if(decoder->private_->stream_decoder->protected_->state == FLAC__STREAM_DECODER_END_OF_STREAM) + decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM; + + if(decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM) + return true; + + FLAC__ASSERT(decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_OK); + + ret = FLAC__stream_decoder_process_one_frame(decoder->private_->stream_decoder); + if(!ret) + decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_ERROR; + + return ret; +} + +FLAC__bool FLAC__seekable_stream_decoder_process_remaining_frames(FLAC__SeekableStreamDecoder *decoder) +{ + FLAC__bool ret; + FLAC__ASSERT(decoder != 0); + + if(decoder->private_->stream_decoder->protected_->state == FLAC__STREAM_DECODER_END_OF_STREAM) + decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM; + + if(decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM) + return true; + + FLAC__ASSERT(decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_OK); + + ret = FLAC__stream_decoder_process_remaining_frames(decoder->private_->stream_decoder); + if(!ret) + decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_ERROR; + + return ret; +} + +FLAC__bool FLAC__seekable_stream_decoder_seek_absolute(FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 sample) +{ + FLAC__uint64 length; + + FLAC__ASSERT(decoder != 0); + FLAC__ASSERT(decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_OK); + + decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEKING; + + /* turn off md5 checking if a seek is attempted */ + decoder->protected_->md5_checking = false; + + if(!FLAC__stream_decoder_reset(decoder->private_->stream_decoder)) { + decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_ERROR; + return false; + } + /* get the file length */ + if(decoder->private_->length_callback(decoder, &length, decoder->private_->client_data) != FLAC__SEEKABLE_STREAM_DECODER_LENGTH_STATUS_OK) { + decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR; + return false; + } + /* rewind */ + if(decoder->private_->seek_callback(decoder, 0, decoder->private_->client_data) != FLAC__SEEKABLE_STREAM_DECODER_SEEK_STATUS_OK) { + decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR; + return false; + } + if(!FLAC__stream_decoder_process_metadata(decoder->private_->stream_decoder)) { + decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_ERROR; + return false; + } + if(sample > decoder->private_->stream_info.total_samples) { + decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR; + return false; + } + + return seek_to_absolute_sample_(decoder, length, sample); +} + +/*********************************************************************** + * + * Private class methods + * + ***********************************************************************/ + +FLAC__StreamDecoderReadStatus read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data) +{ + FLAC__SeekableStreamDecoder *seekable_stream_decoder = (FLAC__SeekableStreamDecoder *)client_data; + (void)decoder; + if(seekable_stream_decoder->private_->eof_callback(seekable_stream_decoder, seekable_stream_decoder->private_->client_data)) { + seekable_stream_decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM; + return FLAC__STREAM_DECODER_READ_END_OF_STREAM; + } + else if(*bytes > 0) { + unsigned bytes_read = *bytes; + if(seekable_stream_decoder->private_->read_callback(seekable_stream_decoder, buffer, &bytes_read, seekable_stream_decoder->private_->client_data) != FLAC__SEEKABLE_STREAM_DECODER_READ_STATUS_OK) { + seekable_stream_decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_READ_ERROR; + return FLAC__STREAM_DECODER_READ_ABORT; + } + if(bytes_read == 0) { + if(seekable_stream_decoder->private_->eof_callback(seekable_stream_decoder, seekable_stream_decoder->private_->client_data)) { + seekable_stream_decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM; + return FLAC__STREAM_DECODER_READ_END_OF_STREAM; + } + else + return FLAC__STREAM_DECODER_READ_CONTINUE; + } + else { + *bytes = bytes_read; + return FLAC__STREAM_DECODER_READ_CONTINUE; + } + } + else + return FLAC__STREAM_DECODER_READ_ABORT; /* abort to avoid a deadlock */ +} + +FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 *buffer[], void *client_data) +{ + FLAC__SeekableStreamDecoder *seekable_stream_decoder = (FLAC__SeekableStreamDecoder *)client_data; + (void)decoder; + + if(seekable_stream_decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_SEEKING) { + FLAC__uint64 this_frame_sample = frame->header.number.sample_number; + FLAC__uint64 next_frame_sample = this_frame_sample + (FLAC__uint64)frame->header.blocksize; + FLAC__uint64 target_sample = seekable_stream_decoder->private_->target_sample; + + FLAC__ASSERT(frame->header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER); + + seekable_stream_decoder->private_->last_frame = *frame; /* save the frame */ + if(this_frame_sample <= target_sample && target_sample < next_frame_sample) { /* we hit our target frame */ + unsigned delta = (unsigned)(target_sample - this_frame_sample); + /* kick out of seek mode */ + seekable_stream_decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_OK; + /* shift out the samples before target_sample */ + if(delta > 0) { + unsigned channel; + const FLAC__int32 *newbuffer[FLAC__MAX_CHANNELS]; + for(channel = 0; channel < frame->header.channels; channel++) + newbuffer[channel] = buffer[channel] + delta; + seekable_stream_decoder->private_->last_frame.header.blocksize -= delta; + seekable_stream_decoder->private_->last_frame.header.number.sample_number += (FLAC__uint64)delta; + /* write the relevant samples */ + return seekable_stream_decoder->private_->write_callback(seekable_stream_decoder, &seekable_stream_decoder->private_->last_frame, newbuffer, seekable_stream_decoder->private_->client_data); + } + else { + /* write the relevant samples */ + return seekable_stream_decoder->private_->write_callback(seekable_stream_decoder, frame, buffer, seekable_stream_decoder->private_->client_data); + } + } + else { + return FLAC__STREAM_DECODER_WRITE_CONTINUE; + } + } + else { + if(seekable_stream_decoder->protected_->md5_checking) { + if(!FLAC__MD5Accumulate(&seekable_stream_decoder->private_->md5context, buffer, frame->header.channels, frame->header.blocksize, (frame->header.bits_per_sample+7) / 8)) + return FLAC__STREAM_DECODER_WRITE_ABORT; + } + return seekable_stream_decoder->private_->write_callback(seekable_stream_decoder, frame, buffer, seekable_stream_decoder->private_->client_data); + } +} + +void metadata_callback_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetaData *metadata, void *client_data) +{ + FLAC__SeekableStreamDecoder *seekable_stream_decoder = (FLAC__SeekableStreamDecoder *)client_data; + (void)decoder; + + if(metadata->type == FLAC__METADATA_TYPE_STREAMINFO) { + seekable_stream_decoder->private_->stream_info = metadata->data.stream_info; + /* save the MD5 signature for comparison later */ + memcpy(seekable_stream_decoder->private_->stored_md5sum, metadata->data.stream_info.md5sum, 16); + if(0 == memcmp(seekable_stream_decoder->private_->stored_md5sum, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", 16)) + seekable_stream_decoder->protected_->md5_checking = false; + } + else if(metadata->type == FLAC__METADATA_TYPE_SEEKTABLE) { + seekable_stream_decoder->private_->seek_table = &metadata->data.seek_table; + } + + if(seekable_stream_decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_SEEKING) + seekable_stream_decoder->private_->metadata_callback(seekable_stream_decoder, metadata, seekable_stream_decoder->private_->client_data); +} + +void error_callback_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data) +{ + FLAC__SeekableStreamDecoder *seekable_stream_decoder = (FLAC__SeekableStreamDecoder *)client_data; + (void)decoder; + + if(seekable_stream_decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_SEEKING) + seekable_stream_decoder->private_->error_callback(seekable_stream_decoder, status, seekable_stream_decoder->private_->client_data); +} + +FLAC__bool seek_to_absolute_sample_(FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample) +{ + FLAC__uint64 first_frame_offset, lower_bound, upper_bound; + FLAC__int64 pos = -1, last_pos = -1; + int i, lower_seek_point = -1, upper_seek_point = -1; + unsigned approx_bytes_per_frame; + FLAC__uint64 last_frame_sample = 0xffffffffffffffff; + FLAC__bool needs_seek; + const FLAC__bool is_variable_blocksize_stream = (decoder->private_->stream_info.min_blocksize != decoder->private_->stream_info.max_blocksize); + + /* we are just guessing here, but we want to guess high, not low */ + if(decoder->private_->stream_info.max_framesize > 0) { + approx_bytes_per_frame = decoder->private_->stream_info.max_framesize; + } + else if(!is_variable_blocksize_stream) { + /* note there are no () around 'decoder->private_->stream_info.bits_per_sample/8' to keep precision up since it's an integer calulation */ + approx_bytes_per_frame = decoder->private_->stream_info.min_blocksize * decoder->private_->stream_info.channels * decoder->private_->stream_info.bits_per_sample/8 + 64; + } + else + approx_bytes_per_frame = 1152 * decoder->private_->stream_info.channels * decoder->private_->stream_info.bits_per_sample/8 + 64; + + /* + * The stream position is currently at the first frame plus any read + * ahead data, so first we get the stream position, then subtract + * uncomsumed bytes to get the position of the first frame in the + * stream. + */ + if(decoder->private_->tell_callback(decoder, &first_frame_offset, decoder->private_->client_data) != FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_OK) { + decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR; + return false; + } + FLAC__ASSERT(first_frame_offset >= FLAC__stream_decoder_get_input_bytes_unconsumed(decoder->private_->stream_decoder)); + first_frame_offset -= FLAC__stream_decoder_get_input_bytes_unconsumed(decoder->private_->stream_decoder); + + /* + * First, we set an upper and lower bound on where in the + * stream we will search. For now we assume the worst case + * scenario, which is our best guess at the beginning of + * the first and last frames. + */ + lower_bound = first_frame_offset; + + /* calc the upper_bound, beyond which we never want to seek */ + if(decoder->private_->stream_info.max_framesize > 0) + upper_bound = stream_length - (decoder->private_->stream_info.max_framesize + 128 + 2); /* 128 for a possible ID3V1 tag, 2 for indexing differences */ + else + upper_bound = stream_length - ((decoder->private_->stream_info.channels * decoder->private_->stream_info.bits_per_sample * FLAC__MAX_BLOCK_SIZE) / 8 + 128 + 2); + + /* + * Now we refine the bounds if we have a seektable with + * suitable points. Note that according to the spec they + * must be ordered by ascending sample number. + */ + if(0 != decoder->private_->seek_table) { + /* find the closest seek point <= target_sample, if it exists */ + for(i = (int)decoder->private_->seek_table->num_points - 1; i >= 0; i--) { + if(decoder->private_->seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER && decoder->private_->seek_table->points[i].sample_number <= target_sample) + break; + } + if(i >= 0) { /* i.e. we found a suitable seek point... */ + lower_bound = first_frame_offset + decoder->private_->seek_table->points[i].stream_offset; + lower_seek_point = i; + } + + /* find the closest seek point > target_sample, if it exists */ + for(i = 0; i < (int)decoder->private_->seek_table->num_points; i++) { + if(decoder->private_->seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER && decoder->private_->seek_table->points[i].sample_number > target_sample) + break; + } + if(i < (int)decoder->private_->seek_table->num_points) { /* i.e. we found a suitable seek point... */ + upper_bound = first_frame_offset + decoder->private_->seek_table->points[i].stream_offset; + upper_seek_point = i; + } + } + + /* + * Now guess at where within those bounds our target + * sample will be. + */ + if(lower_seek_point >= 0) { + /* first see if our sample is within a few frames of the lower seekpoint */ + if(decoder->private_->seek_table->points[lower_seek_point].sample_number <= target_sample && target_sample < decoder->private_->seek_table->points[lower_seek_point].sample_number + (decoder->private_->seek_table->points[lower_seek_point].frame_samples * 4)) { + pos = (FLAC__int64)lower_bound; + } + else if(upper_seek_point >= 0) { + const FLAC__uint64 target_offset = target_sample - decoder->private_->seek_table->points[lower_seek_point].sample_number; + const FLAC__uint64 range_samples = decoder->private_->seek_table->points[upper_seek_point].sample_number - decoder->private_->seek_table->points[lower_seek_point].sample_number; + const FLAC__uint64 range_bytes = upper_bound - lower_bound; +#ifdef _MSC_VER + /* with VC++ you have to spoon feed it the casting */ + pos = (FLAC__int64)lower_bound + (FLAC__int64)((double)(FLAC__int64)target_offset / (double)(FLAC__int64)range_samples * (double)(FLAC__int64)(range_bytes-1)) - approx_bytes_per_frame; +#else + pos = (FLAC__int64)lower_bound + (FLAC__int64)((double)target_offset / (double)range_samples * (double)(range_bytes-1)) - approx_bytes_per_frame; +#endif + } + } + if(pos < 0) { + /* We need to use the metadata and the filelength to estimate the position of the frame with the correct sample */ +#ifdef _MSC_VER + /* with VC++ you have to spoon feed it the casting */ + pos = (FLAC__int64)first_frame_offset + (FLAC__int64)((double)(FLAC__int64)target_sample / (double)(FLAC__int64)decoder->private_->stream_info.total_samples * (double)(FLAC__int64)(stream_length-first_frame_offset-1)) - approx_bytes_per_frame; +#else + pos = (FLAC__int64)first_frame_offset + (FLAC__int64)((double)target_sample / (double)decoder->private_->stream_info.total_samples * (double)(stream_length-first_frame_offset-1)) - approx_bytes_per_frame; +#endif + } + + /* clip the position to the bounds, lower bound takes precedence */ + if(pos >= (FLAC__int64)upper_bound) + pos = (FLAC__int64)upper_bound-1; + if(pos < (FLAC__int64)lower_bound) + pos = (FLAC__int64)lower_bound; + needs_seek = true; + + decoder->private_->target_sample = target_sample; + while(1) { + if(needs_seek) { + if(decoder->private_->seek_callback(decoder, (FLAC__uint64)pos, decoder->private_->client_data) != FLAC__SEEKABLE_STREAM_DECODER_SEEK_STATUS_OK) { + decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR; + return false; + } + if(!FLAC__stream_decoder_flush(decoder->private_->stream_decoder)) { + decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_ERROR; + return false; + } + } + if(!FLAC__stream_decoder_process_one_frame(decoder->private_->stream_decoder)) { + decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR; + return false; + } + /* our write callback will change the state when it gets to the target frame */ + if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_SEEKING) { + break; + } + else { /* we need to narrow the search */ + FLAC__uint64 this_frame_sample = decoder->private_->last_frame.header.number.sample_number; + FLAC__ASSERT(decoder->private_->last_frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER); + if(this_frame_sample == last_frame_sample) { + /* our last move backwards wasn't big enough */ + pos -= (last_pos - pos); + needs_seek = true; + } + else { + if(target_sample < this_frame_sample) { + last_pos = pos; + approx_bytes_per_frame = decoder->private_->last_frame.header.blocksize * decoder->private_->last_frame.header.channels * decoder->private_->last_frame.header.bits_per_sample/8 + 64; + pos -= approx_bytes_per_frame; + needs_seek = true; + } + else { /* target_sample >= this_frame_sample + this frame's blocksize */ + last_pos = pos; + if(decoder->private_->tell_callback(decoder, (FLAC__uint64*)(&pos), decoder->private_->client_data) != FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_OK) { + decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR; + return false; + } + pos -= FLAC__stream_decoder_get_input_bytes_unconsumed(decoder->private_->stream_decoder); + needs_seek = false; + } + } + if(pos < (FLAC__int64)lower_bound) + pos = (FLAC__int64)lower_bound; + last_frame_sample = this_frame_sample; + } + } + + return true; +}