FLAC__bool read_subframe_lpc_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order, FLAC__bool do_full_decode)
{
	FLAC__Subframe_LPC *subframe = &decoder->private_->frame.subframes[channel].data.lpc;
	FLAC__int32 i32;
	FLAC__uint32 u32;
	unsigned u;

	decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_LPC;

	subframe->residual = decoder->private_->residual[channel];
	subframe->order = order;

	/* read warm-up samples */
	for(u = 0; u < order; u++) {
		if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, bps))
			return false; /* read_callback_ sets the state for us */
		subframe->warmup[u] = i32;
	}

	/* read qlp coeff precision */
	if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN))
		return false; /* read_callback_ sets the state for us */
	if(u32 == (1u << FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN) - 1) {
		send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
		decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
		return true;
	}
	subframe->qlp_coeff_precision = u32+1;

	/* read qlp shift */
	if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN))
		return false; /* read_callback_ sets the state for us */
	subframe->quantization_level = i32;

	/* read quantized lp coefficiencts */
	for(u = 0; u < order; u++) {
		if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, subframe->qlp_coeff_precision))
			return false; /* read_callback_ sets the state for us */
		subframe->qlp_coeff[u] = i32;
	}

	/* read entropy coding method info */
	if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN))
		return false; /* read_callback_ sets the state for us */
	subframe->entropy_coding_method.type = (FLAC__EntropyCodingMethodType)u32;
	switch(subframe->entropy_coding_method.type) {
		case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
		case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2:
			if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN))
				return false; /* read_callback_ sets the state for us */
			subframe->entropy_coding_method.data.partitioned_rice.order = u32;
			subframe->entropy_coding_method.data.partitioned_rice.contents = &decoder->private_->partitioned_rice_contents[channel];
			break;
		default:
			send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
			decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
			return true;
	}

	/* read residual */
	switch(subframe->entropy_coding_method.type) {
		case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
		case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2:
			if(!read_residual_partitioned_rice_(decoder, order, subframe->entropy_coding_method.data.partitioned_rice.order, &decoder->private_->partitioned_rice_contents[channel], decoder->private_->residual[channel], /*is_extended=*/subframe->entropy_coding_method.type == FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2))
				return false;
			break;
		default:
			FLAC__ASSERT(0);
	}

	/* decode the subframe */
	if(do_full_decode) {
		memcpy(decoder->private_->output[channel], subframe->warmup, sizeof(FLAC__int32) * order);
		/*@@@@@@ technically not pessimistic enough, should be more like
		if( (FLAC__uint64)order * ((((FLAC__uint64)1)<<bps)-1) * ((1<<subframe->qlp_coeff_precision)-1) < (((FLAC__uint64)-1) << 32) )
		*/
		if(bps + subframe->qlp_coeff_precision + FLAC__bitmath_ilog2(order) <= 32)
			if(bps <= 16 && subframe->qlp_coeff_precision <= 16)
				decoder->private_->local_lpc_restore_signal_16bit(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, subframe->qlp_coeff, order, subframe->quantization_level, decoder->private_->output[channel]+order);
			else
				decoder->private_->local_lpc_restore_signal(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, subframe->qlp_coeff, order, subframe->quantization_level, decoder->private_->output[channel]+order);
		else
			decoder->private_->local_lpc_restore_signal_64bit(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, subframe->qlp_coeff, order, subframe->quantization_level, decoder->private_->output[channel]+order);
	}

	return true;
}
Unknown