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
281
282
283
284
285
286
287
288
|
/*
* RIFF muxing functions
* Copyright (c) 2000 Fabrice Bellard
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/dict.h"
#include "libavutil/log.h"
#include "libavutil/mathematics.h"
#include "libavcodec/avcodec.h"
#include "libavcodec/bytestream.h"
#include "avformat.h"
#include "avio_internal.h"
#include "riff.h"
int64_t ff_start_tag(AVIOContext *pb, const char *tag)
{
ffio_wfourcc(pb, tag);
avio_wl32(pb, 0);
return avio_tell(pb);
}
void ff_end_tag(AVIOContext *pb, int64_t start)
{
int64_t pos;
pos = avio_tell(pb);
avio_seek(pb, start - 4, SEEK_SET);
avio_wl32(pb, (uint32_t)(pos - start));
avio_seek(pb, pos, SEEK_SET);
}
/* WAVEFORMATEX header */
/* returns the size or -1 on error */
int ff_put_wav_header(AVFormatContext *s, AVIOContext *pb,
AVCodecParameters *par)
{
int bps, blkalign, bytespersec, frame_size;
int hdrsize = 18;
int waveformatextensible;
uint8_t temp[256];
uint8_t *riff_extradata = temp;
uint8_t *riff_extradata_start = temp;
if (!par->codec_tag || par->codec_tag > 0xffff)
return -1;
/* We use the known constant frame size for the codec if known, otherwise
* fall back on using AVCodecContext.frame_size, which is not as reliable
* for indicating packet duration. */
frame_size = av_get_audio_frame_duration2(par, par->block_align);
waveformatextensible = (par->channels > 2 && par->channel_layout) ||
par->sample_rate > 48000 ||
av_get_bits_per_sample(par->codec_id) > 16;
if (waveformatextensible)
avio_wl16(pb, 0xfffe);
else
avio_wl16(pb, par->codec_tag);
avio_wl16(pb, par->channels);
avio_wl32(pb, par->sample_rate);
if (par->codec_id == AV_CODEC_ID_MP2 ||
par->codec_id == AV_CODEC_ID_MP3 ||
par->codec_id == AV_CODEC_ID_GSM_MS) {
bps = 0;
} else {
if (!(bps = av_get_bits_per_sample(par->codec_id))) {
if (par->bits_per_coded_sample)
bps = par->bits_per_coded_sample;
else
bps = 16; // default to 16
}
}
if (bps != par->bits_per_coded_sample && par->bits_per_coded_sample) {
av_log(s, AV_LOG_WARNING,
"requested bits_per_coded_sample (%d) "
"and actually stored (%d) differ\n",
par->bits_per_coded_sample, bps);
}
if (par->codec_id == AV_CODEC_ID_MP2) {
blkalign = frame_size;
} else if (par->codec_id == AV_CODEC_ID_MP3) {
blkalign = 576 * (par->sample_rate <= 24000 ? 1 : 2);
} else if (par->codec_id == AV_CODEC_ID_AC3) {
blkalign = 3840; /* maximum bytes per frame */
} else if (par->block_align != 0) { /* specified by the codec */
blkalign = par->block_align;
} else
blkalign = bps * par->channels / av_gcd(8, bps);
if (par->codec_id == AV_CODEC_ID_PCM_U8 ||
par->codec_id == AV_CODEC_ID_PCM_S24LE ||
par->codec_id == AV_CODEC_ID_PCM_S32LE ||
par->codec_id == AV_CODEC_ID_PCM_F32LE ||
par->codec_id == AV_CODEC_ID_PCM_F64LE ||
par->codec_id == AV_CODEC_ID_PCM_S16LE) {
bytespersec = par->sample_rate * blkalign;
} else {
bytespersec = par->bit_rate / 8;
}
avio_wl32(pb, bytespersec); /* bytes per second */
avio_wl16(pb, blkalign); /* block align */
avio_wl16(pb, bps); /* bits per sample */
if (par->codec_id == AV_CODEC_ID_MP3) {
hdrsize += 12;
bytestream_put_le16(&riff_extradata, 1); /* wID */
bytestream_put_le32(&riff_extradata, 2); /* fdwFlags */
bytestream_put_le16(&riff_extradata, 1152); /* nBlockSize */
bytestream_put_le16(&riff_extradata, 1); /* nFramesPerBlock */
bytestream_put_le16(&riff_extradata, 1393); /* nCodecDelay */
} else if (par->codec_id == AV_CODEC_ID_MP2) {
hdrsize += 22;
/* fwHeadLayer */
bytestream_put_le16(&riff_extradata, 2);
/* dwHeadBitrate */
bytestream_put_le32(&riff_extradata, par->bit_rate);
/* fwHeadMode */
bytestream_put_le16(&riff_extradata, par->channels == 2 ? 1 : 8);
/* fwHeadModeExt */
bytestream_put_le16(&riff_extradata, 0);
/* wHeadEmphasis */
bytestream_put_le16(&riff_extradata, 1);
/* fwHeadFlags */
bytestream_put_le16(&riff_extradata, 16);
/* dwPTSLow */
bytestream_put_le32(&riff_extradata, 0);
/* dwPTSHigh */
bytestream_put_le32(&riff_extradata, 0);
} else if (par->codec_id == AV_CODEC_ID_GSM_MS ||
par->codec_id == AV_CODEC_ID_ADPCM_IMA_WAV) {
hdrsize += 2;
/* wSamplesPerBlock */
bytestream_put_le16(&riff_extradata, frame_size);
} else if (par->extradata_size) {
riff_extradata_start = par->extradata;
riff_extradata = par->extradata + par->extradata_size;
hdrsize += par->extradata_size;
}
/* write WAVEFORMATEXTENSIBLE extensions */
if (waveformatextensible) {
hdrsize += 22;
/* 22 is WAVEFORMATEXTENSIBLE size */
avio_wl16(pb, riff_extradata - riff_extradata_start + 22);
/* ValidBitsPerSample || SamplesPerBlock || Reserved */
avio_wl16(pb, bps);
/* dwChannelMask */
avio_wl32(pb, par->channel_layout);
/* GUID + next 3 */
avio_wl32(pb, par->codec_tag);
avio_wl32(pb, 0x00100000);
avio_wl32(pb, 0xAA000080);
avio_wl32(pb, 0x719B3800);
} else {
avio_wl16(pb, riff_extradata - riff_extradata_start); /* cbSize */
}
avio_write(pb, riff_extradata_start, riff_extradata - riff_extradata_start);
if (hdrsize & 1) {
hdrsize++;
avio_w8(pb, 0);
}
return hdrsize;
}
/* BITMAPINFOHEADER header */
void ff_put_bmp_header(AVIOContext *pb, AVCodecParameters *par,
const AVCodecTag *tags, int for_asf)
{
/* size */
avio_wl32(pb, 40 + par->extradata_size);
avio_wl32(pb, par->width);
//We always store RGB TopDown
avio_wl32(pb, par->codec_tag ? par->height : -par->height);
/* planes */
avio_wl16(pb, 1);
/* depth */
avio_wl16(pb, par->bits_per_coded_sample ? par->bits_per_coded_sample : 24);
/* compression type */
avio_wl32(pb, par->codec_tag);
avio_wl32(pb, par->width * par->height * 3);
avio_wl32(pb, 0);
avio_wl32(pb, 0);
avio_wl32(pb, 0);
avio_wl32(pb, 0);
avio_write(pb, par->extradata, par->extradata_size);
if (!for_asf && par->extradata_size & 1)
avio_w8(pb, 0);
}
void ff_parse_specific_params(AVStream *st, int *au_rate,
int *au_ssize, int *au_scale)
{
AVCodecParameters *par = st->codecpar;
int gcd;
int audio_frame_size;
audio_frame_size = av_get_audio_frame_duration2(par, 0);
*au_ssize = par->block_align;
if (audio_frame_size && par->sample_rate) {
*au_scale = audio_frame_size;
*au_rate = par->sample_rate;
} else if (par->codec_type == AVMEDIA_TYPE_VIDEO ||
par->codec_type == AVMEDIA_TYPE_DATA ||
par->codec_type == AVMEDIA_TYPE_SUBTITLE) {
*au_scale = st->time_base.num;
*au_rate = st->time_base.den;
} else {
*au_scale = par->block_align ? par->block_align * 8 : 8;
*au_rate = par->bit_rate ? par->bit_rate :
8 * par->sample_rate;
}
gcd = av_gcd(*au_scale, *au_rate);
*au_scale /= gcd;
*au_rate /= gcd;
}
void ff_riff_write_info_tag(AVIOContext *pb, const char *tag, const char *str)
{
int len = strlen(str);
if (len > 0) {
len++;
ffio_wfourcc(pb, tag);
avio_wl32(pb, len);
avio_put_str(pb, str);
if (len & 1)
avio_w8(pb, 0);
}
}
static const char riff_tags[][5] = {
"IARL", "IART", "ICMS", "ICMT", "ICOP", "ICRD", "ICRP", "IDIM", "IDPI",
"IENG", "IGNR", "IKEY", "ILGT", "ILNG", "IMED", "INAM", "IPLT", "IPRD",
"IPRT", "ITRK", "ISBJ", "ISFT", "ISHP", "ISMP", "ISRC", "ISRF", "ITCH",
{ 0 }
};
static int riff_has_valid_tags(AVFormatContext *s)
{
int i;
for (i = 0; *riff_tags[i]; i++)
if (av_dict_get(s->metadata, riff_tags[i], NULL, AV_DICT_MATCH_CASE))
return 1;
return 0;
}
void ff_riff_write_info(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
int i;
int64_t list_pos;
AVDictionaryEntry *t = NULL;
ff_metadata_conv(&s->metadata, ff_riff_info_conv, NULL);
/* writing empty LIST is not nice and may cause problems */
if (!riff_has_valid_tags(s))
return;
list_pos = ff_start_tag(pb, "LIST");
ffio_wfourcc(pb, "INFO");
for (i = 0; *riff_tags[i]; i++)
if ((t = av_dict_get(s->metadata, riff_tags[i],
NULL, AV_DICT_MATCH_CASE)))
ff_riff_write_info_tag(s->pb, t->key, t->value);
ff_end_tag(pb, list_pos);
}
|
