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/*
* 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();
const auto duration = SongTime::FromScale<uint64_t>(data->total_frames,
data->audio_format.sample_rate);
decoder_initialized(data->decoder, data->audio_format,
data->input_stream.IsSeekable(),
duration);
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;
}
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