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/*
* Copyright 2003-2017 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 "lib/xiph/FlacStreamMetadata.hxx"
#include "Log.hxx"
#include "input/InputStream.hxx"
#include <exception>
bool
FlacDecoder::Initialize(unsigned sample_rate, unsigned bits_per_sample,
unsigned channels, FLAC__uint64 total_frames)
{
assert(!initialized);
assert(!unsupported);
try {
pcm_import.Open(sample_rate, bits_per_sample,
channels);
} catch (...) {
LogError(std::current_exception());
unsupported = true;
return false;
}
const auto audio_format = pcm_import.GetAudioFormat();
const auto duration = total_frames > 0
? SignedSongTime::FromScale<uint64_t>(total_frames,
audio_format.sample_rate)
: SignedSongTime::Negative();
GetClient()->Ready(audio_format,
GetInputStream().IsSeekable(),
duration);
initialized = true;
return true;
}
inline void
FlacDecoder::OnStreamInfo(const FLAC__StreamMetadata_StreamInfo &stream_info)
{
if (initialized)
return;
Initialize(stream_info.sample_rate,
stream_info.bits_per_sample,
stream_info.channels,
stream_info.total_samples);
}
inline void
FlacDecoder::OnVorbisComment(const FLAC__StreamMetadata_VorbisComment &vc)
{
ReplayGainInfo rgi;
if (flac_parse_replay_gain(rgi, vc))
GetClient()->SubmitReplayGain(&rgi);
GetClient()->SubmitMixRamp(flac_parse_mixramp(vc));
tag = flac_vorbis_comments_to_tag(&vc);
}
void
FlacDecoder::OnMetadata(const FLAC__StreamMetadata &metadata)
{
if (unsupported)
return;
switch (metadata.type) {
case FLAC__METADATA_TYPE_STREAMINFO:
OnStreamInfo(metadata.data.stream_info);
break;
case FLAC__METADATA_TYPE_VORBIS_COMMENT:
OnVorbisComment(metadata.data.vorbis_comment);
break;
default:
break;
}
}
inline bool
FlacDecoder::OnFirstFrame(const FLAC__FrameHeader &header)
{
if (unsupported)
return false;
return Initialize(header.sample_rate,
header.bits_per_sample,
header.channels,
/* unknown duration */
0);
}
FLAC__uint64
FlacDecoder::GetDeltaPosition(const FLAC__StreamDecoder &sd)
{
FLAC__uint64 nbytes;
if (!FLAC__stream_decoder_get_decode_position(&sd, &nbytes))
return 0;
if (position > 0 && nbytes > position) {
nbytes -= position;
position += nbytes;
} else {
position = nbytes;
nbytes = 0;
}
return nbytes;
}
FLAC__StreamDecoderWriteStatus
FlacDecoder::OnWrite(const FLAC__Frame &frame,
const FLAC__int32 *const buf[],
FLAC__uint64 nbytes)
{
if (!initialized && !OnFirstFrame(frame.header))
return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
chunk = pcm_import.Import(buf, frame.header.blocksize);
kbit_rate = nbytes * 8 * frame.header.sample_rate /
(1000 * frame.header.blocksize);
return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
}
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