ref: 4770f60b183231822011b026c3e0aef1b70592ee
dir: /sys/src/cmd/audio/libFLAC/file_decoder.c/
/* libFLAC - Free Lossless Audio Codec library
* Copyright (C) 2000,2001,2002,2003,2004 Josh Coalson
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of the Xiph.org Foundation nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdio.h>
#include <stdlib.h> /* for malloc() */
#include <string.h> /* for strcmp() */
#include <sys/stat.h> /* for stat() */
#if defined _MSC_VER || defined __MINGW32__
#include <io.h> /* for _setmode() */
#include <fcntl.h> /* for _O_BINARY */
#elif defined __CYGWIN__
#include <io.h> /* for setmode(), O_BINARY */
#include <fcntl.h> /* for _O_BINARY */
#endif
#include "FLAC/assert.h"
#include "protected/file_decoder.h"
#include "protected/seekable_stream_decoder.h"
/***********************************************************************
*
* Private class method prototypes
*
***********************************************************************/
static void set_defaults_(FLAC__FileDecoder *decoder);
static FILE *get_binary_stdin_(void);
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 * const 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__FileDecoderWriteCallback write_callback;
FLAC__FileDecoderMetadataCallback metadata_callback;
FLAC__FileDecoderErrorCallback error_callback;
void *client_data;
FILE *file;
char *filename; /* == NULL if stdin */
FLAC__SeekableStreamDecoder *seekable_stream_decoder;
} FLAC__FileDecoderPrivate;
/***********************************************************************
*
* Public static class data
*
***********************************************************************/
FLAC_API const char * const FLAC__FileDecoderStateString[] = {
"FLAC__FILE_DECODER_OK",
"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_SEEKABLE_STREAM_DECODER_ERROR",
"FLAC__FILE_DECODER_ALREADY_INITIALIZED",
"FLAC__FILE_DECODER_INVALID_CALLBACK",
"FLAC__FILE_DECODER_UNINITIALIZED"
};
FLAC_API FLAC__SeekableStreamDecoder *FLAC__seekable_stream_decoder_new(void);
/***********************************************************************
*
* Class constructor/destructor
*
***********************************************************************/
FLAC_API FLAC__FileDecoder *FLAC__file_decoder_new(void)
{
FLAC__FileDecoder *decoder;
FLAC__ASSERT(sizeof(int) >= 4); /* we want to die right away if this is not true */
decoder = (FLAC__FileDecoder*)calloc(1, sizeof(FLAC__FileDecoder));
if(decoder == 0) {
return 0;
}
decoder->protected_ = (FLAC__FileDecoderProtected*)calloc(1, sizeof(FLAC__FileDecoderProtected));
if(decoder->protected_ == 0) {
free(decoder);
return 0;
}
decoder->private_ = (FLAC__FileDecoderPrivate*)calloc(1, sizeof(FLAC__FileDecoderPrivate));
if(decoder->private_ == 0) {
free(decoder->protected_);
free(decoder);
return 0;
}
decoder->private_->seekable_stream_decoder = FLAC__seekable_stream_decoder_new();
if(0 == decoder->private_->seekable_stream_decoder) {
free(decoder->private_);
free(decoder->protected_);
free(decoder);
return 0;
}
decoder->private_->file = 0;
set_defaults_(decoder);
decoder->protected_->state = FLAC__FILE_DECODER_UNINITIALIZED;
return decoder;
}
FLAC_API void FLAC__file_decoder_delete(FLAC__FileDecoder *decoder)
{
FLAC__ASSERT(0 != decoder);
FLAC__ASSERT(0 != decoder->protected_);
FLAC__ASSERT(0 != decoder->private_);
FLAC__ASSERT(0 != decoder->private_->seekable_stream_decoder);
(void)FLAC__file_decoder_finish(decoder);
FLAC__seekable_stream_decoder_delete(decoder->private_->seekable_stream_decoder);
free(decoder->private_);
free(decoder->protected_);
free(decoder);
}
/***********************************************************************
*
* Public class methods
*
***********************************************************************/
FLAC_API FLAC__FileDecoderState FLAC__file_decoder_init(FLAC__FileDecoder *decoder)
{
FLAC__ASSERT(0 != decoder);
if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED)
return decoder->protected_->state = FLAC__FILE_DECODER_ALREADY_INITIALIZED;
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;
if(0 == decoder->private_->filename)
decoder->private_->file = get_binary_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;
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);
if(FLAC__seekable_stream_decoder_init(decoder->private_->seekable_stream_decoder) != FLAC__SEEKABLE_STREAM_DECODER_OK)
return decoder->protected_->state = FLAC__FILE_DECODER_SEEKABLE_STREAM_DECODER_ERROR;
return decoder->protected_->state = FLAC__FILE_DECODER_OK;
}
FLAC_API FLAC__bool FLAC__file_decoder_finish(FLAC__FileDecoder *decoder)
{
FLAC__ASSERT(0 != decoder);
if(decoder->protected_->state == FLAC__FILE_DECODER_UNINITIALIZED)
return true;
FLAC__ASSERT(0 != decoder->private_->seekable_stream_decoder);
if(0 != decoder->private_->file && decoder->private_->file != stdin) {
fclose(decoder->private_->file);
decoder->private_->file = 0;
}
if(0 != decoder->private_->filename) {
free(decoder->private_->filename);
decoder->private_->filename = 0;
}
set_defaults_(decoder);
decoder->protected_->state = FLAC__FILE_DECODER_UNINITIALIZED;
return FLAC__seekable_stream_decoder_finish(decoder->private_->seekable_stream_decoder);
}
FLAC_API FLAC__bool FLAC__file_decoder_set_md5_checking(FLAC__FileDecoder *decoder, FLAC__bool value)
{
FLAC__ASSERT(0 != decoder);
FLAC__ASSERT(0 != decoder->private_);
FLAC__ASSERT(0 != decoder->protected_);
FLAC__ASSERT(0 != decoder->private_->seekable_stream_decoder);
if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED)
return false;
return FLAC__seekable_stream_decoder_set_md5_checking(decoder->private_->seekable_stream_decoder, value);
}
FLAC_API FLAC__bool FLAC__file_decoder_set_filename(FLAC__FileDecoder *decoder, const char *value)
{
FLAC__ASSERT(0 != decoder);
FLAC__ASSERT(0 != decoder->private_);
FLAC__ASSERT(0 != decoder->protected_);
FLAC__ASSERT(0 != value);
if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED)
return false;
if(0 != decoder->private_->filename) {
free(decoder->private_->filename);
decoder->private_->filename = 0;
}
if(0 != strcmp(value, "-")) {
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_API FLAC__bool FLAC__file_decoder_set_write_callback(FLAC__FileDecoder *decoder, FLAC__FileDecoderWriteCallback value)
{
FLAC__ASSERT(0 != decoder);
FLAC__ASSERT(0 != decoder->private_);
FLAC__ASSERT(0 != decoder->protected_);
if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED)
return false;
decoder->private_->write_callback = value;
return true;
}
FLAC_API FLAC__bool FLAC__file_decoder_set_metadata_callback(FLAC__FileDecoder *decoder, FLAC__FileDecoderMetadataCallback value)
{
FLAC__ASSERT(0 != decoder);
FLAC__ASSERT(0 != decoder->private_);
FLAC__ASSERT(0 != decoder->protected_);
if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED)
return false;
decoder->private_->metadata_callback = value;
return true;
}
FLAC_API FLAC__bool FLAC__file_decoder_set_error_callback(FLAC__FileDecoder *decoder, FLAC__FileDecoderErrorCallback value)
{
FLAC__ASSERT(0 != decoder);
FLAC__ASSERT(0 != decoder->private_);
FLAC__ASSERT(0 != decoder->protected_);
if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED)
return false;
decoder->private_->error_callback = value;
return true;
}
FLAC_API FLAC__bool FLAC__file_decoder_set_client_data(FLAC__FileDecoder *decoder, void *value)
{
FLAC__ASSERT(0 != decoder);
FLAC__ASSERT(0 != decoder->private_);
FLAC__ASSERT(0 != decoder->protected_);
if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED)
return false;
decoder->private_->client_data = value;
return true;
}
FLAC_API FLAC__bool FLAC__file_decoder_set_metadata_respond(FLAC__FileDecoder *decoder, FLAC__MetadataType type)
{
FLAC__ASSERT(0 != decoder);
FLAC__ASSERT(0 != decoder->private_);
FLAC__ASSERT(0 != decoder->protected_);
FLAC__ASSERT(0 != decoder->private_->seekable_stream_decoder);
if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED)
return false;
return FLAC__seekable_stream_decoder_set_metadata_respond(decoder->private_->seekable_stream_decoder, type);
}
FLAC_API FLAC__bool FLAC__file_decoder_set_metadata_respond_application(FLAC__FileDecoder *decoder, const FLAC__byte id[4])
{
FLAC__ASSERT(0 != decoder);
FLAC__ASSERT(0 != decoder->private_);
FLAC__ASSERT(0 != decoder->protected_);
FLAC__ASSERT(0 != decoder->private_->seekable_stream_decoder);
if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED)
return false;
return FLAC__seekable_stream_decoder_set_metadata_respond_application(decoder->private_->seekable_stream_decoder, id);
}
FLAC_API FLAC__bool FLAC__file_decoder_set_metadata_respond_all(FLAC__FileDecoder *decoder)
{
FLAC__ASSERT(0 != decoder);
FLAC__ASSERT(0 != decoder->private_);
FLAC__ASSERT(0 != decoder->protected_);
FLAC__ASSERT(0 != decoder->private_->seekable_stream_decoder);
if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED)
return false;
return FLAC__seekable_stream_decoder_set_metadata_respond_all(decoder->private_->seekable_stream_decoder);
}
FLAC_API FLAC__bool FLAC__file_decoder_set_metadata_ignore(FLAC__FileDecoder *decoder, FLAC__MetadataType type)
{
FLAC__ASSERT(0 != decoder);
FLAC__ASSERT(0 != decoder->private_);
FLAC__ASSERT(0 != decoder->protected_);
FLAC__ASSERT(0 != decoder->private_->seekable_stream_decoder);
if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED)
return false;
return FLAC__seekable_stream_decoder_set_metadata_ignore(decoder->private_->seekable_stream_decoder, type);
}
FLAC_API FLAC__bool FLAC__file_decoder_set_metadata_ignore_application(FLAC__FileDecoder *decoder, const FLAC__byte id[4])
{
FLAC__ASSERT(0 != decoder);
FLAC__ASSERT(0 != decoder->private_);
FLAC__ASSERT(0 != decoder->protected_);
FLAC__ASSERT(0 != decoder->private_->seekable_stream_decoder);
if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED)
return false;
return FLAC__seekable_stream_decoder_set_metadata_ignore_application(decoder->private_->seekable_stream_decoder, id);
}
FLAC_API FLAC__bool FLAC__file_decoder_set_metadata_ignore_all(FLAC__FileDecoder *decoder)
{
FLAC__ASSERT(0 != decoder);
FLAC__ASSERT(0 != decoder->private_);
FLAC__ASSERT(0 != decoder->protected_);
FLAC__ASSERT(0 != decoder->private_->seekable_stream_decoder);
if(decoder->protected_->state != FLAC__FILE_DECODER_UNINITIALIZED)
return false;
return FLAC__seekable_stream_decoder_set_metadata_ignore_all(decoder->private_->seekable_stream_decoder);
}
FLAC_API FLAC__FileDecoderState FLAC__file_decoder_get_state(const FLAC__FileDecoder *decoder)
{
FLAC__ASSERT(0 != decoder);
FLAC__ASSERT(0 != decoder->protected_);
return decoder->protected_->state;
}
FLAC_API FLAC__SeekableStreamDecoderState FLAC__file_decoder_get_seekable_stream_decoder_state(const FLAC__FileDecoder *decoder)
{
FLAC__ASSERT(0 != decoder);
FLAC__ASSERT(0 != decoder->private_);
return FLAC__seekable_stream_decoder_get_state(decoder->private_->seekable_stream_decoder);
}
FLAC_API FLAC__StreamDecoderState FLAC__file_decoder_get_stream_decoder_state(const FLAC__FileDecoder *decoder)
{
FLAC__ASSERT(0 != decoder);
FLAC__ASSERT(0 != decoder->private_);
return FLAC__seekable_stream_decoder_get_stream_decoder_state(decoder->private_->seekable_stream_decoder);
}
FLAC_API const char *FLAC__file_decoder_get_resolved_state_string(const FLAC__FileDecoder *decoder)
{
if(decoder->protected_->state != FLAC__FILE_DECODER_SEEKABLE_STREAM_DECODER_ERROR)
return FLAC__FileDecoderStateString[decoder->protected_->state];
else
return FLAC__seekable_stream_decoder_get_resolved_state_string(decoder->private_->seekable_stream_decoder);
}
FLAC_API FLAC__bool FLAC__file_decoder_get_md5_checking(const FLAC__FileDecoder *decoder)
{
FLAC__ASSERT(0 != decoder);
FLAC__ASSERT(0 != decoder->private_);
return FLAC__seekable_stream_decoder_get_md5_checking(decoder->private_->seekable_stream_decoder);
}
FLAC_API unsigned FLAC__file_decoder_get_channels(const FLAC__FileDecoder *decoder)
{
FLAC__ASSERT(0 != decoder);
FLAC__ASSERT(0 != decoder->private_);
return FLAC__seekable_stream_decoder_get_channels(decoder->private_->seekable_stream_decoder);
}
FLAC_API FLAC__ChannelAssignment FLAC__file_decoder_get_channel_assignment(const FLAC__FileDecoder *decoder)
{
FLAC__ASSERT(0 != decoder);
FLAC__ASSERT(0 != decoder->private_);
return FLAC__seekable_stream_decoder_get_channel_assignment(decoder->private_->seekable_stream_decoder);
}
FLAC_API unsigned FLAC__file_decoder_get_bits_per_sample(const FLAC__FileDecoder *decoder)
{
FLAC__ASSERT(0 != decoder);
FLAC__ASSERT(0 != decoder->private_);
return FLAC__seekable_stream_decoder_get_bits_per_sample(decoder->private_->seekable_stream_decoder);
}
FLAC_API unsigned FLAC__file_decoder_get_sample_rate(const FLAC__FileDecoder *decoder)
{
FLAC__ASSERT(0 != decoder);
FLAC__ASSERT(0 != decoder->private_);
return FLAC__seekable_stream_decoder_get_sample_rate(decoder->private_->seekable_stream_decoder);
}
FLAC_API unsigned FLAC__file_decoder_get_blocksize(const FLAC__FileDecoder *decoder)
{
FLAC__ASSERT(0 != decoder);
FLAC__ASSERT(0 != decoder->private_);
return FLAC__seekable_stream_decoder_get_blocksize(decoder->private_->seekable_stream_decoder);
}
FLAC_API FLAC__bool FLAC__file_decoder_get_decode_position(const FLAC__FileDecoder *decoder, FLAC__uint64 *position)
{
FLAC__ASSERT(0 != decoder);
FLAC__ASSERT(0 != decoder->private_);
return FLAC__seekable_stream_decoder_get_decode_position(decoder->private_->seekable_stream_decoder, position);
}
FLAC_API FLAC__bool FLAC__file_decoder_process_single(FLAC__FileDecoder *decoder)
{
FLAC__bool ret;
FLAC__ASSERT(0 != decoder);
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_single(decoder->private_->seekable_stream_decoder);
if(!ret)
decoder->protected_->state = FLAC__FILE_DECODER_SEEKABLE_STREAM_DECODER_ERROR;
return ret;
}
FLAC_API FLAC__bool FLAC__file_decoder_process_until_end_of_metadata(FLAC__FileDecoder *decoder)
{
FLAC__bool ret;
FLAC__ASSERT(0 != decoder);
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_until_end_of_metadata(decoder->private_->seekable_stream_decoder);
if(!ret)
decoder->protected_->state = FLAC__FILE_DECODER_SEEKABLE_STREAM_DECODER_ERROR;
return ret;
}
FLAC_API FLAC__bool FLAC__file_decoder_process_until_end_of_file(FLAC__FileDecoder *decoder)
{
FLAC__bool ret;
FLAC__ASSERT(0 != decoder);
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_until_end_of_stream(decoder->private_->seekable_stream_decoder);
if(!ret)
decoder->protected_->state = FLAC__FILE_DECODER_SEEKABLE_STREAM_DECODER_ERROR;
return ret;
}
FLAC_API FLAC__bool FLAC__file_decoder_skip_single_frame(FLAC__FileDecoder *decoder)
{
FLAC__bool ret;
FLAC__ASSERT(0 != decoder);
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_skip_single_frame(decoder->private_->seekable_stream_decoder);
if(!ret)
decoder->protected_->state = FLAC__FILE_DECODER_SEEKABLE_STREAM_DECODER_ERROR;
return ret;
}
FLAC_API FLAC__bool FLAC__file_decoder_seek_absolute(FLAC__FileDecoder *decoder, FLAC__uint64 sample)
{
FLAC__ASSERT(0 != decoder);
FLAC__ASSERT(decoder->protected_->state == FLAC__FILE_DECODER_OK || decoder->protected_->state == FLAC__FILE_DECODER_END_OF_FILE);
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 {
decoder->protected_->state = FLAC__FILE_DECODER_OK;
return true;
}
}
/***********************************************************************
*
* Private class methods
*
***********************************************************************/
void set_defaults_(FLAC__FileDecoder *decoder)
{
FLAC__ASSERT(0 != decoder);
FLAC__ASSERT(0 != decoder->private_);
decoder->private_->filename = 0;
decoder->private_->write_callback = 0;
decoder->private_->metadata_callback = 0;
decoder->private_->error_callback = 0;
decoder->private_->client_data = 0;
}
/*
* This will forcibly set stdin to binary mode (for OSes that require it)
*/
FILE *get_binary_stdin_(void)
{
/* if something breaks here it is probably due to the presence or
* absence of an underscore before the identifiers 'setmode',
* 'fileno', and/or 'O_BINARY'; check your system header files.
*/
#if defined _MSC_VER || defined __MINGW32__
_setmode(_fileno(stdin), _O_BINARY);
#elif defined __CYGWIN__
/* almost certainly not needed for any modern Cygwin, but let's be safe... */
setmode(_fileno(stdin), _O_BINARY);
#endif
return stdin;
}
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) {
*bytes = (unsigned)fread(buffer, sizeof(FLAC__byte), *bytes, file_decoder->private_->file);
if(ferror(file_decoder->private_->file)) {
return FLAC__SEEKABLE_STREAM_DECODER_READ_STATUS_ERROR;
}
else {
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(0 == file_decoder->private_->filename || 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)? true : false;
}
FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__SeekableStreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const 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);
}