1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
/*
* 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 "FlacMetadata.hxx"
#include "Log.hxx"
#include <stdexcept>
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 (const std::runtime_error &e) {
LogError(e);
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;
}