mirrors
/
flac
mirror of https://github.com/xiph/flac
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

split most of FileDecoder off to new SeekableStreamDecoder

This commit is contained in:
Josh Coalson 2001-11-08 23:59:22 +00:00
parent 53ad911a1d
commit dbd84c48e5
13 changed files with 1398 additions and 687 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/FLAC/Makefile.am
View File

@ -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

1
include/FLAC/all.h
View File

@ -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"

9
include/FLAC/file_decoder.h
View File

@ -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);

167
include/FLAC/seekable_stream_decoder.h Normal file
View File

@ -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

1
src/libFLAC/Makefile.am
View File

@ -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 \

1
src/libFLAC/Makefile.lite
View File

@ -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 \

1
src/libFLAC/Makefile.vc
View File

@ -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 \

1155
src/libFLAC/file_decoder.c
View File

File diff suppressed because it is too large Load Diff

1
src/libFLAC/include/protected/Makefile.am
View File

@ -18,5 +18,6 @@
noinst_HEADERS = \
file_decoder.h \
seekable_stream_decoder.h \
stream_decoder.h \
stream_encoder.h

1
src/libFLAC/include/protected/all.h
View File

@ -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"

1
src/libFLAC/include/protected/file_decoder.h
View File

@ -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;

30
src/libFLAC/include/protected/seekable_stream_decoder.h Normal file
View File

@ -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

716
src/libFLAC/seekable_stream_decoder.c Normal file
View File

@ -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 <stdio.h>
#include <stdlib.h> /* 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;
}