file_decoder.c

tcpmp.src.0.72RC1 优秀的多媒体播放器TCPMP的源代码

/* libFLAC - Free Lossless Audio Codec library
 * Copyright (C) 2000,2001,2002,2003,2004,2005  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 "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 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"
};

/***********************************************************************
 *
 * Class constructor/destructor
 *
 ***********************************************************************/

FLAC_API 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*)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;

  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)