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
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
|
/*
* amr file format
* Copyright (c) 2001 FFmpeg project
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*
Write and read amr data according to RFC3267, http://www.ietf.org/rfc/rfc3267.txt?number=3267
*/
#include "config_components.h"
#include "libavutil/channel_layout.h"
#include "libavutil/intreadwrite.h"
#include "avformat.h"
#include "avio_internal.h"
#include "internal.h"
#include "rawdec.h"
#include "rawenc.h"
typedef struct AMRContext {
FFRawDemuxerContext rawctx;
} AMRContext;
static const uint8_t AMR_header[6] = "#!AMR\x0a";
static const uint8_t AMRMC_header[12] = "#!AMR_MC1.0\x0a";
static const uint8_t AMRWB_header[9] = "#!AMR-WB\x0a";
static const uint8_t AMRWBMC_header[15] = "#!AMR-WB_MC1.0\x0a";
static const uint8_t amrnb_packed_size[16] = {
13, 14, 16, 18, 20, 21, 27, 32, 6, 1, 1, 1, 1, 1, 1, 1
};
static const uint8_t amrwb_packed_size[16] = {
18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 1, 1, 1, 1, 1, 1
};
#if CONFIG_AMR_MUXER
static int amr_write_header(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
AVCodecParameters *par = s->streams[0]->codecpar;
if (par->codec_id == AV_CODEC_ID_AMR_NB) {
avio_write(pb, AMR_header, sizeof(AMR_header)); /* magic number */
} else if (par->codec_id == AV_CODEC_ID_AMR_WB) {
avio_write(pb, AMRWB_header, sizeof(AMRWB_header)); /* magic number */
} else {
return -1;
}
return 0;
}
#endif /* CONFIG_AMR_MUXER */
#if CONFIG_AMR_DEMUXER
static int amr_probe(const AVProbeData *p)
{
// Only check for "#!AMR" which could be amr-wb, amr-nb.
// This will also trigger multichannel files: "#!AMR_MC1.0\n" and
// "#!AMR-WB_MC1.0\n"
if (!memcmp(p->buf, AMR_header, 5))
return AVPROBE_SCORE_MAX;
else
return 0;
}
/* amr input */
static int amr_read_header(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
AVStream *st;
uint8_t header[19] = { 0 };
int read, back = 0, ret;
ret = ffio_ensure_seekback(s->pb, sizeof(header));
if (ret < 0)
return ret;
read = avio_read(pb, header, sizeof(header));
if (read < 0)
return read;
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
if (!memcmp(header, AMR_header, sizeof(AMR_header))) {
st->codecpar->codec_tag = MKTAG('s', 'a', 'm', 'r');
st->codecpar->codec_id = AV_CODEC_ID_AMR_NB;
st->codecpar->sample_rate = 8000;
st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
back = read - sizeof(AMR_header);
} else if (!memcmp(header, AMRWB_header, sizeof(AMRWB_header))) {
st->codecpar->codec_tag = MKTAG('s', 'a', 'w', 'b');
st->codecpar->codec_id = AV_CODEC_ID_AMR_WB;
st->codecpar->sample_rate = 16000;
st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
back = read - sizeof(AMRWB_header);
} else if (!memcmp(header, AMRMC_header, sizeof(AMRMC_header))) {
st->codecpar->codec_tag = MKTAG('s', 'a', 'm', 'r');
st->codecpar->codec_id = AV_CODEC_ID_AMR_NB;
st->codecpar->sample_rate = 8000;
st->codecpar->ch_layout.nb_channels = AV_RL32(header + 12);
back = read - 4 - sizeof(AMRMC_header);
} else if (!memcmp(header, AMRWBMC_header, sizeof(AMRWBMC_header))) {
st->codecpar->codec_tag = MKTAG('s', 'a', 'w', 'b');
st->codecpar->codec_id = AV_CODEC_ID_AMR_WB;
st->codecpar->sample_rate = 16000;
st->codecpar->ch_layout.nb_channels = AV_RL32(header + 15);
back = read - 4 - sizeof(AMRWBMC_header);
} else {
return AVERROR_INVALIDDATA;
}
if (st->codecpar->ch_layout.nb_channels < 1)
return AVERROR_INVALIDDATA;
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL_RAW;
avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
if (back > 0)
avio_seek(pb, -back, SEEK_CUR);
return 0;
}
const AVInputFormat ff_amr_demuxer = {
.name = "amr",
.long_name = NULL_IF_CONFIG_SMALL("3GPP AMR"),
.priv_data_size = sizeof(AMRContext),
.read_probe = amr_probe,
.read_header = amr_read_header,
.read_packet = ff_raw_read_partial_packet,
.flags = AVFMT_GENERIC_INDEX,
.priv_class = &ff_raw_demuxer_class,
};
#endif
#if CONFIG_AMRNB_DEMUXER
static int amrnb_probe(const AVProbeData *p)
{
int mode, i = 0, valid = 0, invalid = 0;
const uint8_t *b = p->buf;
while (i < p->buf_size) {
mode = b[i] >> 3 & 0x0F;
if (mode < 9 && (b[i] & 0x4) == 0x4) {
int last = b[i];
int size = amrnb_packed_size[mode];
while (size--) {
if (b[++i] != last)
break;
}
if (size > 0) {
valid++;
i += size;
}
} else {
valid = 0;
invalid++;
i++;
}
}
if (valid > 100 && valid >> 4 > invalid)
return AVPROBE_SCORE_EXTENSION / 2 + 1;
return 0;
}
static int amrnb_read_header(AVFormatContext *s)
{
AVStream *st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
st->codecpar->codec_id = AV_CODEC_ID_AMR_NB;
st->codecpar->sample_rate = 8000;
st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL_RAW;
avpriv_set_pts_info(st, 64, 1, 8000);
return 0;
}
const AVInputFormat ff_amrnb_demuxer = {
.name = "amrnb",
.long_name = NULL_IF_CONFIG_SMALL("raw AMR-NB"),
.priv_data_size = sizeof(AMRContext),
.read_probe = amrnb_probe,
.read_header = amrnb_read_header,
.read_packet = ff_raw_read_partial_packet,
.flags = AVFMT_GENERIC_INDEX,
.priv_class = &ff_raw_demuxer_class,
};
#endif
#if CONFIG_AMRWB_DEMUXER
static int amrwb_probe(const AVProbeData *p)
{
int mode, i = 0, valid = 0, invalid = 0;
const uint8_t *b = p->buf;
while (i < p->buf_size) {
mode = b[i] >> 3 & 0x0F;
if (mode < 10 && (b[i] & 0x4) == 0x4) {
int last = b[i];
int size = amrwb_packed_size[mode];
while (size--) {
if (b[++i] != last)
break;
}
if (size > 0) {
valid++;
i += size;
}
} else {
valid = 0;
invalid++;
i++;
}
}
if (valid > 100 && valid >> 4 > invalid)
return AVPROBE_SCORE_EXTENSION / 2 + 1;
return 0;
}
static int amrwb_read_header(AVFormatContext *s)
{
AVStream *st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
st->codecpar->codec_id = AV_CODEC_ID_AMR_WB;
st->codecpar->sample_rate = 16000;
st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL_RAW;
avpriv_set_pts_info(st, 64, 1, 16000);
return 0;
}
const AVInputFormat ff_amrwb_demuxer = {
.name = "amrwb",
.long_name = NULL_IF_CONFIG_SMALL("raw AMR-WB"),
.priv_data_size = sizeof(AMRContext),
.read_probe = amrwb_probe,
.read_header = amrwb_read_header,
.read_packet = ff_raw_read_partial_packet,
.flags = AVFMT_GENERIC_INDEX,
.priv_class = &ff_raw_demuxer_class,
};
#endif
#if CONFIG_AMR_MUXER
const AVOutputFormat ff_amr_muxer = {
.name = "amr",
.long_name = NULL_IF_CONFIG_SMALL("3GPP AMR"),
.mime_type = "audio/amr",
.extensions = "amr",
.audio_codec = AV_CODEC_ID_AMR_NB,
.video_codec = AV_CODEC_ID_NONE,
.write_header = amr_write_header,
.write_packet = ff_raw_write_packet,
.flags = AVFMT_NOTIMESTAMPS,
};
#endif
|
