stream_decoder.c

wince下著名的视频播放器源码

	return decoder->protected_->state;
}

FLAC_API void FLAC__stream_decoder_finish(FLAC__StreamDecoder *decoder)
{
	unsigned i;
	FLAC__ASSERT(0 != decoder);
	if(decoder->protected_->state == FLAC__STREAM_DECODER_UNINITIALIZED)
		return;
	if(0 != decoder->private_->seek_table.data.seek_table.points) {
		free(decoder->private_->seek_table.data.seek_table.points);
		decoder->private_->seek_table.data.seek_table.points = 0;
		decoder->private_->has_seek_table = false;
	}
	FLAC__bitbuffer_free(decoder->private_->input);
	for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
		/* WATCHOUT:
		 * FLAC__lpc_restore_signal_asm_ia32_mmx() requires that the
		 * output arrays have a buffer of up to 3 zeroes in front
		 * (at negative indices) for alignment purposes; we use 4
		 * to keep the data well-aligned.
		 */
		if(0 != decoder->private_->output[i]) {
			free(decoder->private_->output[i]-4);
			decoder->private_->output[i] = 0;
		}
		if(0 != decoder->private_->residual_unaligned[i]) {
			free(decoder->private_->residual_unaligned[i]);
			decoder->private_->residual_unaligned[i] = decoder->private_->residual[i] = 0;
		}
	}
	decoder->private_->output_capacity = 0;
	decoder->private_->output_channels = 0;

	set_defaults_(decoder);

	decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED;
}

FLAC_API FLAC__bool FLAC__stream_decoder_set_read_callback(FLAC__StreamDecoder *decoder, FLAC__StreamDecoderReadCallback value)
{
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->private_);
	FLAC__ASSERT(0 != decoder->protected_);
	if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
		return false;
	decoder->private_->read_callback = value;
	return true;
}

FLAC_API FLAC__bool FLAC__stream_decoder_set_write_callback(FLAC__StreamDecoder *decoder, FLAC__StreamDecoderWriteCallback value)
{
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->private_);
	FLAC__ASSERT(0 != decoder->protected_);
	if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
		return false;
	decoder->private_->write_callback = value;
	return true;
}

FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_callback(FLAC__StreamDecoder *decoder, FLAC__StreamDecoderMetadataCallback value)
{
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->private_);
	FLAC__ASSERT(0 != decoder->protected_);
	if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
		return false;
	decoder->private_->metadata_callback = value;
	return true;
}

FLAC_API FLAC__bool FLAC__stream_decoder_set_error_callback(FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorCallback value)
{
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->private_);
	FLAC__ASSERT(0 != decoder->protected_);
	if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
		return false;
	decoder->private_->error_callback = value;
	return true;
}

FLAC_API FLAC__bool FLAC__stream_decoder_set_client_data(FLAC__StreamDecoder *decoder, void *value)
{
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->private_);
	FLAC__ASSERT(0 != decoder->protected_);
	if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
		return false;
	decoder->private_->client_data = value;
	return true;
}

FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond(FLAC__StreamDecoder *decoder, FLAC__MetadataType type)
{
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->private_);
	FLAC__ASSERT(0 != decoder->protected_);
	FLAC__ASSERT((unsigned)type <= FLAC__MAX_METADATA_TYPE_CODE);
	/* double protection */
	if((unsigned)type > FLAC__MAX_METADATA_TYPE_CODE)
		return false;
	if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
		return false;
	decoder->private_->metadata_filter[type] = true;
	if(type == FLAC__METADATA_TYPE_APPLICATION)
		decoder->private_->metadata_filter_ids_count = 0;
	return true;
}

FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4])
{
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->private_);
	FLAC__ASSERT(0 != decoder->protected_);
	FLAC__ASSERT(0 != id);
	if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
		return false;

	if(decoder->private_->metadata_filter[FLAC__METADATA_TYPE_APPLICATION])
		return true;

	FLAC__ASSERT(0 != decoder->private_->metadata_filter_ids);

	if(decoder->private_->metadata_filter_ids_count == decoder->private_->metadata_filter_ids_capacity) {
		if(0 == (decoder->private_->metadata_filter_ids = (FLAC__byte*)realloc(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity * 2)))
			return decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
		decoder->private_->metadata_filter_ids_capacity *= 2;
	}

	memcpy(decoder->private_->metadata_filter_ids + decoder->private_->metadata_filter_ids_count * (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), id, (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8));
	decoder->private_->metadata_filter_ids_count++;

	return true;
}

FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond_all(FLAC__StreamDecoder *decoder)
{
	unsigned i;
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->private_);
	FLAC__ASSERT(0 != decoder->protected_);
	if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
		return false;
	for(i = 0; i < sizeof(decoder->private_->metadata_filter) / sizeof(decoder->private_->metadata_filter[0]); i++)
		decoder->private_->metadata_filter[i] = true;
	decoder->private_->metadata_filter_ids_count = 0;
	return true;
}

FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore(FLAC__StreamDecoder *decoder, FLAC__MetadataType type)
{
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->private_);
	FLAC__ASSERT(0 != decoder->protected_);
	FLAC__ASSERT((unsigned)type <= FLAC__MAX_METADATA_TYPE_CODE);
	/* double protection */
	if((unsigned)type > FLAC__MAX_METADATA_TYPE_CODE)
		return false;
	if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
		return false;
	decoder->private_->metadata_filter[type] = false;
	if(type == FLAC__METADATA_TYPE_APPLICATION)
		decoder->private_->metadata_filter_ids_count = 0;
	return true;
}

FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4])
{
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->private_);
	FLAC__ASSERT(0 != decoder->protected_);
	FLAC__ASSERT(0 != id);
	if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
		return false;

	if(!decoder->private_->metadata_filter[FLAC__METADATA_TYPE_APPLICATION])
		return true;

	FLAC__ASSERT(0 != decoder->private_->metadata_filter_ids);

	if(decoder->private_->metadata_filter_ids_count == decoder->private_->metadata_filter_ids_capacity) {
		if(0 == (decoder->private_->metadata_filter_ids = (FLAC__byte*)realloc(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity * 2)))
			return decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
		decoder->private_->metadata_filter_ids_capacity *= 2;
	}

	memcpy(decoder->private_->metadata_filter_ids + decoder->private_->metadata_filter_ids_count * (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), id, (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8));
	decoder->private_->metadata_filter_ids_count++;

	return true;
}

FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore_all(FLAC__StreamDecoder *decoder)
{
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->private_);
	FLAC__ASSERT(0 != decoder->protected_);
	if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
		return false;
	memset(decoder->private_->metadata_filter, 0, sizeof(decoder->private_->metadata_filter));
	decoder->private_->metadata_filter_ids_count = 0;
	return true;
}

FLAC_API FLAC__StreamDecoderState FLAC__stream_decoder_get_state(const FLAC__StreamDecoder *decoder)
{
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->protected_);
	return decoder->protected_->state;
}

FLAC_API const char *FLAC__stream_decoder_get_resolved_state_string(const FLAC__StreamDecoder *decoder)
{
	return FLAC__StreamDecoderStateString[decoder->protected_->state];
}

FLAC_API unsigned FLAC__stream_decoder_get_channels(const FLAC__StreamDecoder *decoder)
{
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->protected_);
	return decoder->protected_->channels;
}

FLAC_API FLAC__ChannelAssignment FLAC__stream_decoder_get_channel_assignment(const FLAC__StreamDecoder *decoder)
{
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->protected_);
	return decoder->protected_->channel_assignment;
}

FLAC_API unsigned FLAC__stream_decoder_get_bits_per_sample(const FLAC__StreamDecoder *decoder)
{
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->protected_);
	return decoder->protected_->bits_per_sample;
}

FLAC_API unsigned FLAC__stream_decoder_get_sample_rate(const FLAC__StreamDecoder *decoder)
{
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->protected_);
	return decoder->protected_->sample_rate;
}

FLAC_API unsigned FLAC__stream_decoder_get_blocksize(const FLAC__StreamDecoder *decoder)
{
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->protected_);
	return decoder->protected_->blocksize;
}

FLAC_API FLAC__bool FLAC__stream_decoder_flush(FLAC__StreamDecoder *decoder)
{
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->private_);
	FLAC__ASSERT(0 != decoder->protected_);

	if(!FLAC__bitbuffer_clear(decoder->private_->input)) {
		decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
		return false;
	}
	decoder->private_->last_frame_number = 0;
	decoder->private_->last_block_size = 0;
	decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;

	return true;
}

FLAC_API FLAC__bool FLAC__stream_decoder_reset(FLAC__StreamDecoder *decoder)
{
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->private_);
	FLAC__ASSERT(0 != decoder->protected_);

	if(!FLAC__stream_decoder_flush(decoder)) {
		decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
		return false;
	}
	decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_METADATA;

	decoder->private_->samples_decoded = 0;

	return true;
}

FLAC_API FLAC__bool FLAC__stream_decoder_process_single(FLAC__StreamDecoder *decoder)
{
	FLAC__bool got_a_frame;
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->protected_);

	while(1) {
		switch(decoder->protected_->state) {
			case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
				if(!find_metadata_(decoder))
					return false; /* above function sets the status for us */
				break;
			case FLAC__STREAM_DECODER_READ_METADATA:
				if(!read_metadata_(decoder))
					return false; /* above function sets the status for us */
				else
					return true;
			case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
				if(!frame_sync_(decoder))
					return true; /* above function sets the status for us */
				break;
			case FLAC__STREAM_DECODER_READ_FRAME:
				if(!read_frame_(decoder, &got_a_frame, /*do_full_decode=*/true))
					return false; /* above function sets the status for us */
				if(got_a_frame)
					return true; /* above function sets the status for us */
				break;
			case FLAC__STREAM_DECODER_END_OF_STREAM:
			case FLAC__STREAM_DECODER_ABORTED:
				return true;
			default:
				FLAC__ASSERT(0);
				return false;
		}
	}
}

FLAC_API FLAC__bool FLAC__stream_decoder_process_until_end_of_metadata(FLAC__StreamDecoder *decoder)
{
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->protected_);

	while(1) {
		switch(decoder->protected_->state) {