decoder/*: move to decoder/plugins/

src/decoder/plugins/FlacCommon.cxx

@@ -0,0 +1,190 @@
+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+/*
+ * Common data structures and functions used by FLAC and OggFLAC
+ */
+
+#include "config.h"
+#include "FlacCommon.hxx"
+#include "FlacMetadata.hxx"
+#include "FlacPcm.hxx"
+#include "CheckAudioFormat.hxx"
+#include "util/Error.hxx"
+#include "Log.hxx"
+
+flac_data::flac_data(Decoder &_decoder,
+		     InputStream &_input_stream)
+	:FlacInput(_input_stream, &_decoder),
+	 initialized(false), unsupported(false),
+	 total_frames(0), first_frame(0), next_frame(0), position(0),
+	 decoder(_decoder), input_stream(_input_stream)
+{
+}
+
+static SampleFormat
+flac_sample_format(unsigned bits_per_sample)
+{
+	switch (bits_per_sample) {
+	case 8:
+		return SampleFormat::S8;
+
+	case 16:
+		return SampleFormat::S16;
+
+	case 24:
+		return SampleFormat::S24_P32;
+
+	case 32:
+		return SampleFormat::S32;
+
+	default:
+		return SampleFormat::UNDEFINED;
+	}
+}
+
+static void
+flac_got_stream_info(struct flac_data *data,
+		     const FLAC__StreamMetadata_StreamInfo *stream_info)
+{
+	if (data->initialized || data->unsupported)
+		return;
+
+	Error error;
+	if (!audio_format_init_checked(data->audio_format,
+				       stream_info->sample_rate,
+				       flac_sample_format(stream_info->bits_per_sample),
+				       stream_info->channels, error)) {
+		LogError(error);
+		data->unsupported = true;
+		return;
+	}
+
+	data->frame_size = data->audio_format.GetFrameSize();
+
+	if (data->total_frames == 0)
+		data->total_frames = stream_info->total_samples;
+
+	data->initialized = true;
+}
+
+void flac_metadata_common_cb(const FLAC__StreamMetadata * block,
+			     struct flac_data *data)
+{
+	if (data->unsupported)
+		return;
+
+	ReplayGainInfo rgi;
+
+	switch (block->type) {
+	case FLAC__METADATA_TYPE_STREAMINFO:
+		flac_got_stream_info(data, &block->data.stream_info);
+		break;
+
+	case FLAC__METADATA_TYPE_VORBIS_COMMENT:
+		if (flac_parse_replay_gain(rgi, block))
+			decoder_replay_gain(data->decoder, &rgi);
+
+		decoder_mixramp(data->decoder, flac_parse_mixramp(block));
+
+		data->tag = flac_vorbis_comments_to_tag(&block->data.vorbis_comment);
+		break;
+
+	default:
+		break;
+	}
+}
+
+/**
+ * This function attempts to call decoder_initialized() in case there
+ * was no STREAMINFO block.  This is allowed for nonseekable streams,
+ * where the server sends us only a part of the file, without
+ * providing the STREAMINFO block from the beginning of the file
+ * (e.g. when seeking with SqueezeBox Server).
+ */
+static bool
+flac_got_first_frame(struct flac_data *data, const FLAC__FrameHeader *header)
+{
+	if (data->unsupported)
+		return false;
+
+	Error error;
+	if (!audio_format_init_checked(data->audio_format,
+				       header->sample_rate,
+				       flac_sample_format(header->bits_per_sample),
+				       header->channels, error)) {
+		LogError(error);
+		data->unsupported = true;
+		return false;
+	}
+
+	data->frame_size = data->audio_format.GetFrameSize();
+
+	decoder_initialized(data->decoder, data->audio_format,
+			    data->input_stream.seekable,
+			    (float)data->total_frames /
+			    (float)data->audio_format.sample_rate);
+
+	data->initialized = true;
+
+	return true;
+}
+
+FLAC__StreamDecoderWriteStatus
+flac_common_write(struct flac_data *data, const FLAC__Frame * frame,
+		  const FLAC__int32 *const buf[],
+		  FLAC__uint64 nbytes)
+{
+	void *buffer;
+	unsigned bit_rate;
+
+	if (!data->initialized && !flac_got_first_frame(data, &frame->header))
+		return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
+
+	size_t buffer_size = frame->header.blocksize * data->frame_size;
+	buffer = data->buffer.Get(buffer_size);
+
+	flac_convert(buffer, frame->header.channels,
+		     data->audio_format.format, buf,
+		     0, frame->header.blocksize);
+
+	if (nbytes > 0)
+		bit_rate = nbytes * 8 * frame->header.sample_rate /
+			(1000 * frame->header.blocksize);
+	else
+		bit_rate = 0;
+
+	auto cmd = decoder_data(data->decoder, data->input_stream,
+				buffer, buffer_size,
+				bit_rate);
+	data->next_frame += frame->header.blocksize;
+	switch (cmd) {
+	case DecoderCommand::NONE:
+	case DecoderCommand::START:
+		break;
+
+	case DecoderCommand::STOP:
+		return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
+
+	case DecoderCommand::SEEK:
+		return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
+	}
+
+	return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
+}