stream_decoder.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.

	if(decoder->protected_->state != OggFLAC__STREAM_DECODER_UNINITIALIZED)
		return false;
	return FLAC__stream_decoder_set_metadata_respond_all(decoder->private_->FLAC_stream_decoder);
}

OggFLAC_API FLAC__bool OggFLAC__stream_decoder_set_metadata_ignore(OggFLAC__StreamDecoder *decoder, FLAC__MetadataType type)
{
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->private_);
	FLAC__ASSERT(0 != decoder->protected_);
	if(decoder->protected_->state != OggFLAC__STREAM_DECODER_UNINITIALIZED)
		return false;
	return FLAC__stream_decoder_set_metadata_ignore(decoder->private_->FLAC_stream_decoder, type);
}

OggFLAC_API FLAC__bool OggFLAC__stream_decoder_set_metadata_ignore_application(OggFLAC__StreamDecoder *decoder, const FLAC__byte id[4])
{
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->private_);
	FLAC__ASSERT(0 != decoder->protected_);
	if(decoder->protected_->state != OggFLAC__STREAM_DECODER_UNINITIALIZED)
		return false;
	return FLAC__stream_decoder_set_metadata_ignore_application(decoder->private_->FLAC_stream_decoder, id);
}

OggFLAC_API FLAC__bool OggFLAC__stream_decoder_set_metadata_ignore_all(OggFLAC__StreamDecoder *decoder)
{
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->private_);
	FLAC__ASSERT(0 != decoder->protected_);
	if(decoder->protected_->state != OggFLAC__STREAM_DECODER_UNINITIALIZED)
		return false;
	return FLAC__stream_decoder_set_metadata_ignore_all(decoder->private_->FLAC_stream_decoder);
}

OggFLAC_API OggFLAC__StreamDecoderState OggFLAC__stream_decoder_get_state(const OggFLAC__StreamDecoder *decoder)
{
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->protected_);
	return decoder->protected_->state;
}

OggFLAC_API FLAC__StreamDecoderState OggFLAC__stream_decoder_get_FLAC_stream_decoder_state(const OggFLAC__StreamDecoder *decoder)
{
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->private_);
	return FLAC__stream_decoder_get_state(decoder->private_->FLAC_stream_decoder);
}

OggFLAC_API const char *OggFLAC__stream_decoder_get_resolved_state_string(const OggFLAC__StreamDecoder *decoder)
{
	if(decoder->protected_->state != OggFLAC__STREAM_DECODER_FLAC_STREAM_DECODER_ERROR)
		return OggFLAC__StreamDecoderStateString[decoder->protected_->state];
	else
		return FLAC__stream_decoder_get_resolved_state_string(decoder->private_->FLAC_stream_decoder);
}

OggFLAC_API unsigned OggFLAC__stream_decoder_get_channels(const OggFLAC__StreamDecoder *decoder)
{
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->private_);
	return FLAC__stream_decoder_get_channels(decoder->private_->FLAC_stream_decoder);
}

OggFLAC_API FLAC__ChannelAssignment OggFLAC__stream_decoder_get_channel_assignment(const OggFLAC__StreamDecoder *decoder)
{
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->private_);
	return FLAC__stream_decoder_get_channel_assignment(decoder->private_->FLAC_stream_decoder);
}

OggFLAC_API unsigned OggFLAC__stream_decoder_get_bits_per_sample(const OggFLAC__StreamDecoder *decoder)
{
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->private_);
	return FLAC__stream_decoder_get_bits_per_sample(decoder->private_->FLAC_stream_decoder);
}

OggFLAC_API unsigned OggFLAC__stream_decoder_get_sample_rate(const OggFLAC__StreamDecoder *decoder)
{
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->private_);
	return FLAC__stream_decoder_get_sample_rate(decoder->private_->FLAC_stream_decoder);
}

OggFLAC_API unsigned OggFLAC__stream_decoder_get_blocksize(const OggFLAC__StreamDecoder *decoder)
{
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->private_);
	return FLAC__stream_decoder_get_blocksize(decoder->private_->FLAC_stream_decoder);
}

OggFLAC_API FLAC__bool OggFLAC__stream_decoder_flush(OggFLAC__StreamDecoder *decoder)
{
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->private_);
	FLAC__ASSERT(0 != decoder->protected_);

	OggFLAC__ogg_decoder_aspect_flush(&decoder->protected_->ogg_decoder_aspect);

	if(!FLAC__stream_decoder_flush(decoder->private_->FLAC_stream_decoder)) {
		decoder->protected_->state = OggFLAC__STREAM_DECODER_FLAC_STREAM_DECODER_ERROR;
		return false;
	}

	decoder->protected_->state = OggFLAC__STREAM_DECODER_OK;

	return true;
}

OggFLAC_API FLAC__bool OggFLAC__stream_decoder_reset(OggFLAC__StreamDecoder *decoder)
{
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->private_);
	FLAC__ASSERT(0 != decoder->protected_);

	if(!OggFLAC__stream_decoder_flush(decoder)) {
		decoder->protected_->state = OggFLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
		return false;
	}

	OggFLAC__ogg_decoder_aspect_reset(&decoder->protected_->ogg_decoder_aspect);

	if(!FLAC__stream_decoder_reset(decoder->private_->FLAC_stream_decoder)) {
		decoder->protected_->state = OggFLAC__STREAM_DECODER_FLAC_STREAM_DECODER_ERROR;
		return false;
	}

	decoder->protected_->state = OggFLAC__STREAM_DECODER_OK;

	return true;
}

OggFLAC_API FLAC__bool OggFLAC__stream_decoder_process_single(OggFLAC__StreamDecoder *decoder)
{
	FLAC__bool ret;
	FLAC__ASSERT(0 != decoder);

	if(FLAC__stream_decoder_get_state(decoder->private_->FLAC_stream_decoder) == FLAC__STREAM_DECODER_END_OF_STREAM)
		decoder->protected_->state = OggFLAC__STREAM_DECODER_END_OF_STREAM;

	if(decoder->protected_->state == OggFLAC__STREAM_DECODER_END_OF_STREAM)
		return true;

	FLAC__ASSERT(decoder->protected_->state == OggFLAC__STREAM_DECODER_OK);

	ret = FLAC__stream_decoder_process_single(decoder->private_->FLAC_stream_decoder);
	if(!ret)
		decoder->protected_->state = OggFLAC__STREAM_DECODER_FLAC_STREAM_DECODER_ERROR;

	return ret;
}

OggFLAC_API FLAC__bool OggFLAC__stream_decoder_process_until_end_of_metadata(OggFLAC__StreamDecoder *decoder)
{
	FLAC__bool ret;
	FLAC__ASSERT(0 != decoder);

	if(FLAC__stream_decoder_get_state(decoder->private_->FLAC_stream_decoder) == FLAC__STREAM_DECODER_END_OF_STREAM)
		decoder->protected_->state = OggFLAC__STREAM_DECODER_END_OF_STREAM;

	if(decoder->protected_->state == OggFLAC__STREAM_DECODER_END_OF_STREAM)
		return true;

	FLAC__ASSERT(decoder->protected_->state == OggFLAC__STREAM_DECODER_OK);

	ret = FLAC__stream_decoder_process_until_end_of_metadata(decoder->private_->FLAC_stream_decoder);
	if(!ret)
		decoder->protected_->state = OggFLAC__STREAM_DECODER_FLAC_STREAM_DECODER_ERROR;

	return ret;
}

OggFLAC_API FLAC__bool OggFLAC__stream_decoder_process_until_end_of_stream(OggFLAC__StreamDecoder *decoder)
{
	FLAC__bool ret;
	FLAC__ASSERT(0 != decoder);

	if(FLAC__stream_decoder_get_state(decoder->private_->FLAC_stream_decoder) == FLAC__STREAM_DECODER_END_OF_STREAM)
		decoder->protected_->state = OggFLAC__STREAM_DECODER_END_OF_STREAM;

	if(decoder->protected_->state == OggFLAC__STREAM_DECODER_END_OF_STREAM)
		return true;

	FLAC__ASSERT(decoder->protected_->state == OggFLAC__STREAM_DECODER_OK);

	ret = FLAC__stream_decoder_process_until_end_of_stream(decoder->private_->FLAC_stream_decoder);
	if(!ret)
		decoder->protected_->state = OggFLAC__STREAM_DECODER_FLAC_STREAM_DECODER_ERROR;

	return ret;
}


/***********************************************************************
 *
 * Private class methods
 *
 ***********************************************************************/

void set_defaults_(OggFLAC__StreamDecoder *decoder)
{
	decoder->private_->read_callback = 0;
	decoder->private_->write_callback = 0;
	decoder->private_->metadata_callback = 0;
	decoder->private_->error_callback = 0;
	decoder->private_->client_data = 0;
	OggFLAC__ogg_decoder_aspect_set_defaults(&decoder->protected_->ogg_decoder_aspect);
}

FLAC__StreamDecoderReadStatus read_callback_(const FLAC__StreamDecoder *unused, FLAC__byte buffer[], unsigned *bytes, void *client_data)
{
	OggFLAC__StreamDecoder *decoder = (OggFLAC__StreamDecoder*)client_data;

	(void)unused;

	switch(OggFLAC__ogg_decoder_aspect_read_callback_wrapper(&decoder->protected_->ogg_decoder_aspect, buffer, bytes, read_callback_proxy_, decoder, decoder->private_->client_data)) {
		case OggFLAC__OGG_DECODER_ASPECT_READ_STATUS_OK:
			return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
		/* we don't really have a way to handle lost sync via read
		 * callback so we'll let it pass and let the underlying
		 * FLAC decoder catch the error
		 */
		case OggFLAC__OGG_DECODER_ASPECT_READ_STATUS_LOST_SYNC:
			return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
		case OggFLAC__OGG_DECODER_ASPECT_READ_STATUS_END_OF_STREAM:
			return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;
		case OggFLAC__OGG_DECODER_ASPECT_READ_STATUS_NOT_FLAC:
		case OggFLAC__OGG_DECODER_ASPECT_READ_STATUS_UNSUPPORTED_MAPPING_VERSION:
		case OggFLAC__OGG_DECODER_ASPECT_READ_STATUS_ABORT:
		case OggFLAC__OGG_DECODER_ASPECT_READ_STATUS_ERROR:
			decoder->protected_->state = OggFLAC__STREAM_DECODER_READ_ERROR;
			return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
		case OggFLAC__OGG_DECODER_ASPECT_READ_STATUS_MEMORY_ALLOCATION_ERROR:
			decoder->protected_->state = OggFLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
			return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
		default:
			FLAC__ASSERT(0);
			/* double protection */
			return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
	}
}

FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__StreamDecoder *unused, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data)
{
	OggFLAC__StreamDecoder *decoder = (OggFLAC__StreamDecoder*)client_data;
	(void)unused;
	return decoder->private_->write_callback(decoder, frame, buffer, decoder->private_->client_data);
}

void metadata_callback_(const FLAC__StreamDecoder *unused, const FLAC__StreamMetadata *metadata, void *client_data)
{
	OggFLAC__StreamDecoder *decoder = (OggFLAC__StreamDecoder*)client_data;
	(void)unused;
	decoder->private_->metadata_callback(decoder, metadata, decoder->private_->client_data);
}

void error_callback_(const FLAC__StreamDecoder *unused, FLAC__StreamDecoderErrorStatus status, void *client_data)
{
	OggFLAC__StreamDecoder *decoder = (OggFLAC__StreamDecoder*)client_data;
	(void)unused;
	decoder->private_->error_callback(decoder, status, decoder->private_->client_data);
}

OggFLAC__OggDecoderAspectReadStatus read_callback_proxy_(const void *void_decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data)
{
	OggFLAC__StreamDecoder *decoder = (OggFLAC__StreamDecoder*)void_decoder;

	switch(decoder->private_->read_callback(decoder, buffer, bytes, client_data)) {
		case FLAC__STREAM_DECODER_READ_STATUS_CONTINUE:
			return OggFLAC__OGG_DECODER_ASPECT_READ_STATUS_OK;
		case FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM:
			return OggFLAC__OGG_DECODER_ASPECT_READ_STATUS_END_OF_STREAM;
		case FLAC__STREAM_DECODER_READ_STATUS_ABORT:
			return OggFLAC__OGG_DECODER_ASPECT_READ_STATUS_ABORT;
		default:
			/* double protection: */
			FLAC__ASSERT(0);
			return OggFLAC__OGG_DECODER_ASPECT_READ_STATUS_ABORT;
	}
}