seekable_stream_encoder.c

这是著名的TCPMP播放器在WINDWOWS,和WINCE下编译通过的源程序.笔者对其中的LIBMAD库做了针对ARM MPU的优化. 并增加了词幕功能.

/* libFLAC - Free Lossless Audio Codec library
 * Copyright (C) 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 calloc() */
#include <string.h> /* for memcpy() */
#include "FLAC/assert.h"
#include "protected/seekable_stream_encoder.h"

#ifdef max
#undef max
#endif
#define max(a,b) ((a)>(b)?(a):(b))

/***********************************************************************
 *
 * Private class method prototypes
 *
 ***********************************************************************/

/* unpublished debug routines */
extern FLAC__bool FLAC__stream_encoder_disable_constant_subframes(FLAC__StreamEncoder *encoder, FLAC__bool value);
extern FLAC__bool FLAC__stream_encoder_disable_fixed_subframes(FLAC__StreamEncoder *encoder, FLAC__bool value);
extern FLAC__bool FLAC__stream_encoder_disable_verbatim_subframes(FLAC__StreamEncoder *encoder, FLAC__bool value);

static void set_defaults_(FLAC__SeekableStreamEncoder *encoder);
static FLAC__StreamEncoderWriteStatus write_callback_(const FLAC__StreamEncoder *encoder, const FLAC__byte buffer[], unsigned bytes, unsigned samples, unsigned current_frame, void *client_data);
static void metadata_callback_(const FLAC__StreamEncoder *encoder, const FLAC__StreamMetadata *metadata, void *client_data);

/***********************************************************************
 *
 * Private class data
 *
 ***********************************************************************/

typedef struct FLAC__SeekableStreamEncoderPrivate {
	FLAC__SeekableStreamEncoderSeekCallback seek_callback;
	FLAC__SeekableStreamEncoderTellCallback tell_callback;
	FLAC__SeekableStreamEncoderWriteCallback write_callback;
	void *client_data;
	FLAC__StreamEncoder *stream_encoder;
	FLAC__StreamMetadata_SeekTable *seek_table;
	/* internal vars (all the above are class settings) */
	unsigned first_seekpoint_to_check;
	FLAC__uint64 samples_written;
} FLAC__SeekableStreamEncoderPrivate;

/***********************************************************************
 *
 * Public static class data
 *
 ***********************************************************************/

FLAC_API const char * const FLAC__SeekableStreamEncoderStateString[] = {
	"FLAC__SEEKABLE_STREAM_ENCODER_OK",
	"FLAC__SEEKABLE_STREAM_ENCODER_STREAM_ENCODER_ERROR",
	"FLAC__SEEKABLE_STREAM_ENCODER_MEMORY_ALLOCATION_ERROR",
	"FLAC__SEEKABLE_STREAM_ENCODER_WRITE_ERROR",
	"FLAC__SEEKABLE_STREAM_ENCODER_READ_ERROR",
	"FLAC__SEEKABLE_STREAM_ENCODER_SEEK_ERROR",
	"FLAC__SEEKABLE_STREAM_ENCODER_TELL_ERROR",
	"FLAC__SEEKABLE_STREAM_ENCODER_ALREADY_INITIALIZED",
	"FLAC__SEEKABLE_STREAM_ENCODER_INVALID_CALLBACK",
	"FLAC__SEEKABLE_STREAM_ENCODER_INVALID_SEEKTABLE",
	"FLAC__SEEKABLE_STREAM_ENCODER_UNINITIALIZED"
};

FLAC_API const char * const FLAC__SeekableStreamEncoderSeekStatusString[] = {
	"FLAC__SEEKABLE_STREAM_ENCODER_SEEK_STATUS_OK",
	"FLAC__SEEKABLE_STREAM_ENCODER_SEEK_STATUS_ERROR"
};

FLAC_API const char * const FLAC__SeekableStreamEncoderTellStatusString[] = {
	"FLAC__SEEKABLE_STREAM_ENCODER_TELL_STATUS_OK",
	"FLAC__SEEKABLE_STREAM_ENCODER_TELL_STATUS_ERROR"
};


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

FLAC_API FLAC__SeekableStreamEncoder *FLAC__seekable_stream_encoder_new()
{
	FLAC__SeekableStreamEncoder *encoder;

	FLAC__ASSERT(sizeof(int) >= 4); /* we want to die right away if this is not true */

	encoder = (FLAC__SeekableStreamEncoder*)calloc(1, sizeof(FLAC__SeekableStreamEncoder));
	if(encoder == 0) {
		return 0;
	}

	encoder->protected_ = (FLAC__SeekableStreamEncoderProtected*)calloc(1, sizeof(FLAC__SeekableStreamEncoderProtected));
	if(encoder->protected_ == 0) {
		free(encoder);
		return 0;
	}

	encoder->private_ = (FLAC__SeekableStreamEncoderPrivate*)calloc(1, sizeof(FLAC__SeekableStreamEncoderPrivate));
	if(encoder->private_ == 0) {
		free(encoder->protected_);
		free(encoder);
		return 0;
	}

	encoder->private_->stream_encoder = FLAC__stream_encoder_new();
	if(0 == encoder->private_->stream_encoder) {
		free(encoder->private_);
		free(encoder->protected_);
		free(encoder);
		return 0;
	}

	set_defaults_(encoder);

	encoder->protected_->state = FLAC__SEEKABLE_STREAM_ENCODER_UNINITIALIZED;

	return encoder;
}

FLAC_API void FLAC__seekable_stream_encoder_delete(FLAC__SeekableStreamEncoder *encoder)
{
	FLAC__ASSERT(0 != encoder);
	FLAC__ASSERT(0 != encoder->protected_);
	FLAC__ASSERT(0 != encoder->private_);
	FLAC__ASSERT(0 != encoder->private_->stream_encoder);

	(void)FLAC__seekable_stream_encoder_finish(encoder);

	FLAC__stream_encoder_delete(encoder->private_->stream_encoder);

	free(encoder->private_);
	free(encoder->protected_);
	free(encoder);
}


/***********************************************************************
 *
 * Public class methods
 *
 ***********************************************************************/

FLAC_API FLAC__SeekableStreamEncoderState FLAC__seekable_stream_encoder_init(FLAC__SeekableStreamEncoder *encoder)
{
	FLAC__ASSERT(0 != encoder);

	if(encoder->protected_->state != FLAC__SEEKABLE_STREAM_ENCODER_UNINITIALIZED)
		return encoder->protected_->state = FLAC__SEEKABLE_STREAM_ENCODER_ALREADY_INITIALIZED;

	if(0 == encoder->private_->seek_callback || 0 == encoder->private_->tell_callback || 0 == encoder->private_->write_callback)
		return encoder->protected_->state = FLAC__SEEKABLE_STREAM_ENCODER_INVALID_CALLBACK;

	if(0 != encoder->private_->seek_table && !FLAC__format_seektable_is_legal(encoder->private_->seek_table))
		return encoder->protected_->state = FLAC__SEEKABLE_STREAM_ENCODER_INVALID_SEEKTABLE;

	/*
	 * These must be done before we init the stream encoder because that
	 * calls the write_callback, which uses these values.
	 */
	encoder->private_->first_seekpoint_to_check = 0;
	encoder->private_->samples_written = 0;
	encoder->protected_->streaminfo_offset = 0;
	encoder->protected_->seektable_offset = 0;
	encoder->protected_->audio_offset = 0;

	FLAC__stream_encoder_set_write_callback(encoder->private_->stream_encoder, write_callback_);
	FLAC__stream_encoder_set_metadata_callback(encoder->private_->stream_encoder, metadata_callback_);
	FLAC__stream_encoder_set_client_data(encoder->private_->stream_encoder, encoder);

	if(FLAC__stream_encoder_init(encoder->private_->stream_encoder) != FLAC__STREAM_ENCODER_OK)
		return encoder->protected_->state = FLAC__SEEKABLE_STREAM_ENCODER_STREAM_ENCODER_ERROR;

	/*
	 * Initializing the stream encoder writes all the metadata, so we
	 * save the stream offset now.
	 */
	if(encoder->private_->tell_callback(encoder, &encoder->protected_->audio_offset, encoder->private_->client_data) != FLAC__SEEKABLE_STREAM_ENCODER_TELL_STATUS_OK)
		return encoder->protected_->state = FLAC__SEEKABLE_STREAM_ENCODER_TELL_ERROR;

	return encoder->protected_->state = FLAC__SEEKABLE_STREAM_ENCODER_OK;
}

FLAC_API void FLAC__seekable_stream_encoder_finish(FLAC__SeekableStreamEncoder *encoder)
{
	FLAC__ASSERT(0 != encoder);
	FLAC__ASSERT(0 != encoder->private_);
	FLAC__ASSERT(0 != encoder->protected_);

	if(encoder->protected_->state == FLAC__SEEKABLE_STREAM_ENCODER_UNINITIALIZED)
		return;

	FLAC__ASSERT(0 != encoder->private_->stream_encoder);

	FLAC__stream_encoder_finish(encoder->private_->stream_encoder);

	set_defaults_(encoder);

	encoder->protected_->state = FLAC__SEEKABLE_STREAM_ENCODER_UNINITIALIZED;
}

FLAC_API FLAC__bool FLAC__seekable_stream_encoder_set_verify(FLAC__SeekableStreamEncoder *encoder, FLAC__bool value)
{
	FLAC__ASSERT(0 != encoder);
	FLAC__ASSERT(0 != encoder->private_);
	FLAC__ASSERT(0 != encoder->protected_);
	FLAC__ASSERT(0 != encoder->private_->stream_encoder);
	if(encoder->protected_->state != FLAC__SEEKABLE_STREAM_ENCODER_UNINITIALIZED)
		return false;
	return FLAC__stream_encoder_set_verify(encoder->private_->stream_encoder, value);
}

FLAC_API FLAC__bool FLAC__seekable_stream_encoder_set_streamable_subset(FLAC__SeekableStreamEncoder *encoder, FLAC__bool value)
{
	FLAC__ASSERT(0 != encoder);
	FLAC__ASSERT(0 != encoder->private_);
	FLAC__ASSERT(0 != encoder->protected_);
	FLAC__ASSERT(0 != encoder->private_->stream_encoder);
	if(encoder->protected_->state != FLAC__SEEKABLE_STREAM_ENCODER_UNINITIALIZED)
		return false;
	return FLAC__stream_encoder_set_streamable_subset(encoder->private_->stream_encoder, value);
}

FLAC_API FLAC__bool FLAC__seekable_stream_encoder_set_do_mid_side_stereo(FLAC__SeekableStreamEncoder *encoder, FLAC__bool value)
{
	FLAC__ASSERT(0 != encoder);
	FLAC__ASSERT(0 != encoder->private_);
	FLAC__ASSERT(0 != encoder->protected_);
	FLAC__ASSERT(0 != encoder->private_->stream_encoder);
	if(encoder->protected_->state != FLAC__SEEKABLE_STREAM_ENCODER_UNINITIALIZED)
		return false;
	return FLAC__stream_encoder_set_do_mid_side_stereo(encoder->private_->stream_encoder, value);
}

FLAC_API FLAC__bool FLAC__seekable_stream_encoder_set_loose_mid_side_stereo(FLAC__SeekableStreamEncoder *encoder, FLAC__bool value)
{
	FLAC__ASSERT(0 != encoder);
	FLAC__ASSERT(0 != encoder->private_);
	FLAC__ASSERT(0 != encoder->protected_);
	FLAC__ASSERT(0 != encoder->private_->stream_encoder);
	if(encoder->protected_->state != FLAC__SEEKABLE_STREAM_ENCODER_UNINITIALIZED)
		return false;
	return FLAC__stream_encoder_set_loose_mid_side_stereo(encoder->private_->stream_encoder, value);
}

FLAC_API FLAC__bool FLAC__seekable_stream_encoder_set_channels(FLAC__SeekableStreamEncoder *encoder, unsigned value)
{
	FLAC__ASSERT(0 != encoder);
	FLAC__ASSERT(0 != encoder->private_);
	FLAC__ASSERT(0 != encoder->protected_);
	FLAC__ASSERT(0 != encoder->private_->stream_encoder);
	if(encoder->protected_->state != FLAC__SEEKABLE_STREAM_ENCODER_UNINITIALIZED)
		return false;
	return FLAC__stream_encoder_set_channels(encoder->private_->stream_encoder, value);
}

FLAC_API FLAC__bool FLAC__seekable_stream_encoder_set_bits_per_sample(FLAC__SeekableStreamEncoder *encoder, unsigned value)
{
	FLAC__ASSERT(0 != encoder);
	FLAC__ASSERT(0 != encoder->private_);
	FLAC__ASSERT(0 != encoder->protected_);
	FLAC__ASSERT(0 != encoder->private_->stream_encoder);
	if(encoder->protected_->state != FLAC__SEEKABLE_STREAM_ENCODER_UNINITIALIZED)
		return false;
	return FLAC__stream_encoder_set_bits_per_sample(encoder->private_->stream_encoder, value);
}

FLAC_API FLAC__bool FLAC__seekable_stream_encoder_set_sample_rate(FLAC__SeekableStreamEncoder *encoder, unsigned value)
{
	FLAC__ASSERT(0 != encoder);
	FLAC__ASSERT(0 != encoder->private_);
	FLAC__ASSERT(0 != encoder->protected_);
	FLAC__ASSERT(0 != encoder->private_->stream_encoder);
	if(encoder->protected_->state != FLAC__SEEKABLE_STREAM_ENCODER_UNINITIALIZED)
		return false;
	return FLAC__stream_encoder_set_sample_rate(encoder->private_->stream_encoder, value);
}

FLAC_API FLAC__bool FLAC__seekable_stream_encoder_set_blocksize(FLAC__SeekableStreamEncoder *encoder, unsigned value)
{
	FLAC__ASSERT(0 != encoder);
	FLAC__ASSERT(0 != encoder->private_);
	FLAC__ASSERT(0 != encoder->protected_);
	FLAC__ASSERT(0 != encoder->private_->stream_encoder);