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
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
|
/*
* Copyright (C) 2003-2012 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 <glib.h>
#include <assert.h>
flac_data::flac_data(struct decoder *_decoder,
struct input_stream *_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 enum sample_format
flac_sample_format(unsigned bits_per_sample)
{
switch (bits_per_sample) {
case 8:
return SAMPLE_FORMAT_S8;
case 16:
return SAMPLE_FORMAT_S16;
case 24:
return SAMPLE_FORMAT_S24_P32;
case 32:
return SAMPLE_FORMAT_S32;
default:
return SAMPLE_FORMAT_UNDEFINED;
}
}
static void
flac_got_stream_info(struct flac_data *data,
const FLAC__StreamMetadata_StreamInfo *stream_info)
{
if (data->initialized || data->unsupported)
return;
GError *error = nullptr;
if (!audio_format_init_checked(&data->audio_format,
stream_info->sample_rate,
flac_sample_format(stream_info->bits_per_sample),
stream_info->channels, &error)) {
g_warning("%s", error->message);
g_error_free(error);
data->unsupported = true;
return;
}
data->frame_size = audio_format_frame_size(&data->audio_format);
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;
struct replay_gain_info rgi;
char *mixramp_start;
char *mixramp_end;
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);
if (flac_parse_mixramp(&mixramp_start, &mixramp_end, block))
decoder_mixramp(data->decoder,
mixramp_start, mixramp_end);
flac_vorbis_comments_to_tag(data->tag,
&block->data.vorbis_comment);
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;
GError *error = nullptr;
if (!audio_format_init_checked(&data->audio_format,
header->sample_rate,
flac_sample_format(header->bits_per_sample),
header->channels, &error)) {
g_warning("%s", error->message);
g_error_free(error);
data->unsupported = true;
return false;
}
data->frame_size = audio_format_frame_size(&data->audio_format);
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)
{
enum decoder_command cmd;
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,
(enum sample_format)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;
cmd = decoder_data(data->decoder, data->input_stream,
buffer, buffer_size,
bit_rate);
data->next_frame += frame->header.blocksize;
switch (cmd) {
case DECODE_COMMAND_NONE:
case DECODE_COMMAND_START:
break;
case DECODE_COMMAND_STOP:
return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
case DECODE_COMMAND_SEEK:
return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
}
return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
}
|
