FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavformat/mp3enc.c
Date: 2022-12-05 20:26:17
Exec Total Coverage
Lines: 204 297 68.7%
Functions: 11 13 84.6%
Branches: 87 173 50.3%

Line Branch Exec Source
1 /*
2 * MP3 muxer
3 * Copyright (c) 2003 Fabrice Bellard
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include "avformat.h"
23 #include "avio_internal.h"
24 #include "id3v1.h"
25 #include "id3v2.h"
26 #include "rawenc.h"
27 #include "libavutil/avstring.h"
28 #include "libavcodec/mpegaudio.h"
29 #include "libavcodec/mpegaudiodata.h"
30 #include "libavcodec/mpegaudiodecheader.h"
31 #include "libavcodec/packet_internal.h"
32 #include "libavutil/intreadwrite.h"
33 #include "libavutil/opt.h"
34 #include "libavutil/dict.h"
35 #include "libavutil/avassert.h"
36 #include "libavutil/crc.h"
37 #include "libavutil/mathematics.h"
38 #include "libavutil/replaygain.h"
39
40 static int id3v1_set_string(AVFormatContext *s, const char *key,
41 uint8_t *buf, int buf_size)
42 {
43 AVDictionaryEntry *tag;
44 if ((tag = av_dict_get(s->metadata, key, NULL, 0)))
45 av_strlcpy(buf, tag->value, buf_size);
46 return !!tag;
47 }
48
49 // refer to: http://id3.org/ID3v1
50 static int id3v1_create_tag(AVFormatContext *s, uint8_t *buf)
51 {
52 AVDictionaryEntry *tag;
53 int i, count = 0;
54
55 memset(buf, 0, ID3v1_TAG_SIZE); /* fail safe */
56 buf[0] = 'T';
57 buf[1] = 'A';
58 buf[2] = 'G';
59 /* we knowingly overspecify each tag length by one byte to compensate for the mandatory null byte added by av_strlcpy */
60 count += id3v1_set_string(s, "TIT2", buf + 3, 30 + 1); //title
61 count += id3v1_set_string(s, "TPE1", buf + 33, 30 + 1); //author|artist
62 count += id3v1_set_string(s, "TALB", buf + 63, 30 + 1); //album
63 if ((tag = av_dict_get(s->metadata, "TYER", NULL, 0))) { //year
64 av_strlcpy(buf + 93, tag->value, 4 + 1);
65 count++;
66 } else if ((tag = av_dict_get(s->metadata, "TDRC", NULL, 0))) {
67 av_strlcpy(buf + 93, tag->value, 4 + 1);
68 count++;
69 } else if ((tag = av_dict_get(s->metadata, "TDAT", NULL, 0))) {
70 av_strlcpy(buf + 93, tag->value, 4 + 1);
71 count++;
72 }
73
74 count += id3v1_set_string(s, "comment", buf + 97, 30 + 1);
75 if ((tag = av_dict_get(s->metadata, "TRCK", NULL, 0))) { //track
76 buf[125] = 0;
77 buf[126] = atoi(tag->value);
78 count++;
79 }
80 buf[127] = 0xFF; /* default to unknown genre */
81 if ((tag = av_dict_get(s->metadata, "TCON", NULL, 0))) { //genre
82 for(i = 0; i <= ID3v1_GENRE_MAX; i++) {
83 if (!av_strcasecmp(tag->value, ff_id3v1_genre_str[i])) {
84 buf[127] = i;
85 count++;
86 break;
87 }
88 }
89 }
90 return count;
91 }
92
93 #define XING_NUM_BAGS 400
94 #define XING_TOC_SIZE 100
95 // size of the XING/LAME data, starting from the Xing tag
96 #define XING_SIZE 156
97
98 typedef struct MP3Context {
99 const AVClass *class;
100 ID3v2EncContext id3;
101 int id3v2_version;
102 int write_id3v1;
103 int write_xing;
104
105 /* xing header */
106 // a buffer containing the whole XING/LAME frame
107 uint8_t *xing_frame;
108 int xing_frame_size;
109
110 AVCRC audio_crc; // CRC of the audio data
111 uint32_t audio_size; // total size of the audio data
112
113 // offset of the XING/LAME frame in the file
114 int64_t xing_frame_offset;
115 // offset of the XING/INFO tag in the frame
116 int xing_offset;
117
118 int32_t frames;
119 int32_t size;
120 uint32_t want;
121 uint32_t seen;
122 uint32_t pos;
123 uint64_t bag[XING_NUM_BAGS];
124 int initial_bitrate;
125 int has_variable_bitrate;
126 int delay;
127 int padding;
128
129 /* index of the audio stream */
130 int audio_stream_idx;
131 /* number of attached pictures we still need to write */
132 int pics_to_write;
133
134 /* audio packets are queued here until we get all the attached pictures */
135 PacketList queue;
136 } MP3Context;
137
138 static const uint8_t xing_offtbl[2][2] = {{32, 17}, {17, 9}};
139
140 /*
141 * Write an empty XING header and initialize respective data.
142 */
143 3 static int mp3_write_xing(AVFormatContext *s)
144 {
145 3 MP3Context *mp3 = s->priv_data;
146 3 AVCodecParameters *par = s->streams[mp3->audio_stream_idx]->codecpar;
147 3 AVDictionaryEntry *enc = av_dict_get(s->streams[mp3->audio_stream_idx]->metadata, "encoder", NULL, 0);
148 AVIOContext *dyn_ctx;
149 int32_t header;
150 MPADecodeHeader mpah;
151 int srate_idx, i, channels;
152 int bitrate_idx;
153 3 int best_bitrate_idx = -1;
154 3 int best_bitrate_error = INT_MAX;
155 int ret;
156 3 int ver = 0;
157 int bytes_needed;
158
159
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3 if (!(s->pb->seekable & AVIO_SEEKABLE_NORMAL) || !mp3->write_xing)
160 return 0;
161
162
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6 for (i = 0; i < FF_ARRAY_ELEMS(ff_mpa_freq_tab); i++) {
163 6 const uint16_t base_freq = ff_mpa_freq_tab[i];
164
165
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6 if (par->sample_rate == base_freq) ver = 0x3; // MPEG 1
166
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3 else if (par->sample_rate == base_freq / 2) ver = 0x2; // MPEG 2
167
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3 else if (par->sample_rate == base_freq / 4) ver = 0x0; // MPEG 2.5
168 3 else continue;
169
170 3 srate_idx = i;
171 3 break;
172 }
173
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3 if (i == FF_ARRAY_ELEMS(ff_mpa_freq_tab)) {
174 av_log(s, AV_LOG_WARNING, "Unsupported sample rate, not writing Xing header.\n");
175 return -1;
176 }
177
178
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3 switch (par->ch_layout.nb_channels) {
179 2 case 1: channels = MPA_MONO; break;
180 1 case 2: channels = MPA_STEREO; break;
181 default: av_log(s, AV_LOG_WARNING, "Unsupported number of channels, "
182 "not writing Xing header.\n");
183 return -1;
184 }
185
186 /* dummy MPEG audio header */
187 3 header = 0xffU << 24; // sync
188 3 header |= (0x7 << 5 | ver << 3 | 0x1 << 1 | 0x1) << 16; // sync/audio-version/layer 3/no crc*/
189 3 header |= (srate_idx << 2) << 8;
190 3 header |= channels << 6;
191
192
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45 for (bitrate_idx = 1; bitrate_idx < 15; bitrate_idx++) {
193 42 int bit_rate = 1000 * ff_mpa_bitrate_tab[ver != 3][3 - 1][bitrate_idx];
194 42 int error = FFABS(bit_rate - par->bit_rate);
195
196
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42 if (error < best_bitrate_error) {
197 17 best_bitrate_error = error;
198 17 best_bitrate_idx = bitrate_idx;
199 }
200 }
201
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3 av_assert0(best_bitrate_idx >= 0);
202
203 3 for (bitrate_idx = best_bitrate_idx; ; bitrate_idx++) {
204 3 int32_t mask = bitrate_idx << (4 + 8);
205
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3 if (15 == bitrate_idx)
206 return -1;
207 3 header |= mask;
208
209 3 ret = avpriv_mpegaudio_decode_header(&mpah, header);
210
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3 av_assert0(ret >= 0);
211 3 mp3->xing_offset = xing_offtbl[mpah.lsf == 1][mpah.nb_channels == 1] + 4;
212 3 bytes_needed = mp3->xing_offset + XING_SIZE;
213
214
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3 if (bytes_needed <= mpah.frame_size)
215 3 break;
216
217 header &= ~mask;
218 }
219
220 3 ret = avio_open_dyn_buf(&dyn_ctx);
221
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3 if (ret < 0)
222 return ret;
223
224 3 avio_wb32(dyn_ctx, header);
225
226 3 ffio_fill(dyn_ctx, 0, mp3->xing_offset - 4);
227 3 ffio_wfourcc(dyn_ctx, "Xing");
228 3 avio_wb32(dyn_ctx, 0x01 | 0x02 | 0x04 | 0x08); // frames / size / TOC / vbr scale
229
230 3 mp3->size = mpah.frame_size;
231 3 mp3->want=1;
232 3 mp3->seen=0;
233 3 mp3->pos=0;
234
235 3 avio_wb32(dyn_ctx, 0); // frames
236 3 avio_wb32(dyn_ctx, 0); // size
237
238 // TOC
239
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303 for (i = 0; i < XING_TOC_SIZE; i++)
240 300 avio_w8(dyn_ctx, (uint8_t)(255 * i / XING_TOC_SIZE));
241
242 // vbr quality
243 // we write it, because some (broken) tools always expect it to be present
244 3 avio_wb32(dyn_ctx, 0);
245
246 // encoder short version string
247
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3 if (enc) {
248 uint8_t encoder_str[9] = { 0 };
249 if ( strlen(enc->value) > sizeof(encoder_str)
250 && !strcmp("Lavc libmp3lame", enc->value)) {
251 memcpy(encoder_str, "Lavf lame", 9);
252 } else
253 memcpy(encoder_str, enc->value, FFMIN(strlen(enc->value), sizeof(encoder_str)));
254
255 avio_write(dyn_ctx, encoder_str, sizeof(encoder_str));
256 } else
257 3 avio_write(dyn_ctx, "Lavf\0\0\0\0\0", 9);
258
259 3 avio_w8(dyn_ctx, 0); // tag revision 0 / unknown vbr method
260 3 avio_w8(dyn_ctx, 0); // unknown lowpass filter value
261 3 ffio_fill(dyn_ctx, 0, 8); // empty replaygain fields
262 3 avio_w8(dyn_ctx, 0); // unknown encoding flags
263 3 avio_w8(dyn_ctx, 0); // unknown abr/minimal bitrate
264 3 avio_wb24(dyn_ctx, 0); // empty encoder delay/padding
265
266 3 avio_w8(dyn_ctx, 0); // misc
267 3 avio_w8(dyn_ctx, 0); // mp3gain
268 3 avio_wb16(dyn_ctx, 0); // preset
269
270 // audio length and CRCs (will be updated later)
271 3 avio_wb32(dyn_ctx, 0); // music length
272 3 avio_wb16(dyn_ctx, 0); // music crc
273 3 avio_wb16(dyn_ctx, 0); // tag crc
274
275 3 ffio_fill(dyn_ctx, 0, mpah.frame_size - bytes_needed);
276
277 3 mp3->xing_frame_size = avio_close_dyn_buf(dyn_ctx, &mp3->xing_frame);
278 3 mp3->xing_frame_offset = avio_tell(s->pb);
279 3 avio_write(s->pb, mp3->xing_frame, mp3->xing_frame_size);
280
281 3 mp3->audio_size = mp3->xing_frame_size;
282
283 3 return 0;
284 }
285
286 /*
287 * Add a frame to XING data.
288 * Following lame's "VbrTag.c".
289 */
290 214 static void mp3_xing_add_frame(MP3Context *mp3, AVPacket *pkt)
291 {
292 int i;
293
294 214 mp3->frames++;
295 214 mp3->seen++;
296 214 mp3->size += pkt->size;
297
298
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214 if (mp3->want == mp3->seen) {
299 214 mp3->bag[mp3->pos] = mp3->size;
300
301
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214 if (XING_NUM_BAGS == ++mp3->pos) {
302 /* shrink table to half size by throwing away each second bag. */
303 for (i = 1; i < XING_NUM_BAGS; i += 2)
304 mp3->bag[i >> 1] = mp3->bag[i];
305
306 /* double wanted amount per bag. */
307 mp3->want *= 2;
308 /* adjust current position to half of table size. */
309 mp3->pos = XING_NUM_BAGS / 2;
310 }
311
312 214 mp3->seen = 0;
313 }
314 214 }
315
316 214 static int mp3_write_audio_packet(AVFormatContext *s, AVPacket *pkt)
317 {
318 214 MP3Context *mp3 = s->priv_data;
319
320
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214 if (pkt->data && pkt->size >= 4) {
321 MPADecodeHeader mpah;
322 int ret;
323 int av_unused base;
324 uint32_t h;
325
326 214 h = AV_RB32(pkt->data);
327 214 ret = avpriv_mpegaudio_decode_header(&mpah, h);
328
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214 if (ret >= 0) {
329
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214 if (!mp3->initial_bitrate)
330 3 mp3->initial_bitrate = mpah.bit_rate;
331
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214 if ((mpah.bit_rate == 0) || (mp3->initial_bitrate != mpah.bit_rate))
332 140 mp3->has_variable_bitrate = 1;
333 } else {
334 av_log(s, AV_LOG_WARNING, "Audio packet of size %d (starting with %08"PRIX32"...) "
335 "is invalid, writing it anyway.\n", pkt->size, h);
336 }
337
338 #ifdef FILTER_VBR_HEADERS
339 /* filter out XING and INFO headers. */
340 base = 4 + xing_offtbl[mpah.lsf == 1][mpah.nb_channels == 1];
341
342 if (base + 4 <= pkt->size) {
343 uint32_t v = AV_RB32(pkt->data + base);
344
345 if (MKBETAG('X','i','n','g') == v || MKBETAG('I','n','f','o') == v)
346 return 0;
347 }
348
349 /* filter out VBRI headers. */
350 base = 4 + 32;
351
352 if (base + 4 <= pkt->size && MKBETAG('V','B','R','I') == AV_RB32(pkt->data + base))
353 return 0;
354 #endif
355
356
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214 if (mp3->xing_offset) {
357 214 uint8_t *side_data = NULL;
358 size_t side_data_size;
359
360 214 mp3_xing_add_frame(mp3, pkt);
361 214 mp3->audio_size += pkt->size;
362 428 mp3->audio_crc = av_crc(av_crc_get_table(AV_CRC_16_ANSI_LE),
363 214 mp3->audio_crc, pkt->data, pkt->size);
364
365 214 side_data = av_packet_get_side_data(pkt,
366 AV_PKT_DATA_SKIP_SAMPLES,
367 &side_data_size);
368
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214 if (side_data && side_data_size >= 10) {
369
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1 mp3->padding = FFMAX(AV_RL32(side_data + 4) + 528 + 1, 0);
370
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1 if (!mp3->delay)
371
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1 mp3->delay = FFMAX(AV_RL32(side_data) - 528 - 1, 0);
372 } else {
373 213 mp3->padding = 0;
374 }
375 }
376 }
377
378 214 return ff_raw_write_packet(s, pkt);
379 }
380
381 1 static int mp3_queue_flush(AVFormatContext *s)
382 {
383 1 MP3Context *mp3 = s->priv_data;
384 1 AVPacket *const pkt = ffformatcontext(s)->pkt;
385 1 int ret = 0, write = 1;
386
387 1 ff_id3v2_finish(&mp3->id3, s->pb, s->metadata_header_padding);
388 1 mp3_write_xing(s);
389
390
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2 while (mp3->queue.head) {
391 1 avpriv_packet_list_get(&mp3->queue, pkt);
392
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1 if (write && (ret = mp3_write_audio_packet(s, pkt)) < 0)
393 write = 0;
394 1 av_packet_unref(pkt);
395 }
396 1 return ret;
397 }
398
399 3 static void mp3_update_xing(AVFormatContext *s)
400 {
401 3 MP3Context *mp3 = s->priv_data;
402 AVReplayGain *rg;
403 uint16_t tag_crc;
404 uint8_t *toc;
405 size_t rg_size;
406 int i;
407 3 int64_t old_pos = avio_tell(s->pb);
408
409 /* replace "Xing" identification string with "Info" for CBR files. */
410
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3 if (!mp3->has_variable_bitrate)
411 2 AV_WL32(mp3->xing_frame + mp3->xing_offset, MKTAG('I', 'n', 'f', 'o'));
412
413 3 AV_WB32(mp3->xing_frame + mp3->xing_offset + 8, mp3->frames);
414 3 AV_WB32(mp3->xing_frame + mp3->xing_offset + 12, mp3->size);
415
416 3 toc = mp3->xing_frame + mp3->xing_offset + 16;
417 3 toc[0] = 0; // first toc entry has to be zero.
418
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300 for (i = 1; i < XING_TOC_SIZE; ++i) {
419 297 int j = i * mp3->pos / XING_TOC_SIZE;
420 297 int seek_point = 256LL * mp3->bag[j] / mp3->size;
421 297 toc[i] = FFMIN(seek_point, 255);
422 }
423
424 /* write replaygain */
425 3 rg = (AVReplayGain*)av_stream_get_side_data(s->streams[0], AV_PKT_DATA_REPLAYGAIN,
426 &rg_size);
427
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3 if (rg && rg_size >= sizeof(*rg)) {
428 uint16_t val;
429
430 AV_WB32(mp3->xing_frame + mp3->xing_offset + 131,
431 av_rescale(rg->track_peak, 1 << 23, 100000));
432
433 if (rg->track_gain != INT32_MIN) {
434 val = FFABS(rg->track_gain / 10000) & ((1 << 9) - 1);
435 val |= (rg->track_gain < 0) << 9;
436 val |= 1 << 13;
437 AV_WB16(mp3->xing_frame + mp3->xing_offset + 135, val);
438 }
439
440 if (rg->album_gain != INT32_MIN) {
441 val = FFABS(rg->album_gain / 10000) & ((1 << 9) - 1);
442 val |= (rg->album_gain < 0) << 9;
443 val |= 1 << 14;
444 AV_WB16(mp3->xing_frame + mp3->xing_offset + 137, val);
445 }
446 }
447
448 /* write encoder delay/padding */
449
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3 if (mp3->delay >= 1 << 12) {
450 mp3->delay = (1 << 12) - 1;
451 av_log(s, AV_LOG_WARNING, "Too many samples of initial padding.\n");
452 }
453
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3 if (mp3->padding >= 1 << 12) {
454 mp3->padding = (1 << 12) - 1;
455 av_log(s, AV_LOG_WARNING, "Too many samples of trailing padding.\n");
456 }
457 3 AV_WB24(mp3->xing_frame + mp3->xing_offset + 141, (mp3->delay << 12) + mp3->padding);
458
459 3 AV_WB32(mp3->xing_frame + mp3->xing_offset + XING_SIZE - 8, mp3->audio_size);
460 3 AV_WB16(mp3->xing_frame + mp3->xing_offset + XING_SIZE - 4, mp3->audio_crc);
461
462 3 tag_crc = av_crc(av_crc_get_table(AV_CRC_16_ANSI_LE), 0, mp3->xing_frame, 190);
463 3 AV_WB16(mp3->xing_frame + mp3->xing_offset + XING_SIZE - 2, tag_crc);
464
465 3 avio_seek(s->pb, mp3->xing_frame_offset, SEEK_SET);
466 3 avio_write(s->pb, mp3->xing_frame, mp3->xing_frame_size);
467 3 avio_seek(s->pb, old_pos, SEEK_SET);
468 3 }
469
470 3 static int mp3_write_trailer(struct AVFormatContext *s)
471 {
472 uint8_t buf[ID3v1_TAG_SIZE];
473 3 MP3Context *mp3 = s->priv_data;
474
475
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3 if (mp3->pics_to_write) {
476 av_log(s, AV_LOG_WARNING, "No packets were sent for some of the "
477 "attached pictures.\n");
478 mp3_queue_flush(s);
479 }
480
481 /* write the id3v1 tag */
482
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3 if (mp3->write_id3v1 && id3v1_create_tag(s, buf) > 0) {
483 avio_write(s->pb, buf, ID3v1_TAG_SIZE);
484 }
485
486
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3 if (mp3->xing_offset)
487 3 mp3_update_xing(s);
488
489 3 return 0;
490 }
491
492 2 static int query_codec(enum AVCodecID id, int std_compliance)
493 {
494 2 const CodecMime *cm= ff_id3v2_mime_tags;
495
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8 while(cm->id != AV_CODEC_ID_NONE) {
496
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8 if(id == cm->id)
497 2 return MKTAG('A', 'P', 'I', 'C');
498 6 cm++;
499 }
500 return -1;
501 }
502
503 static const AVOption options[] = {
504 { "id3v2_version", "Select ID3v2 version to write. Currently 3 and 4 are supported.",
505 offsetof(MP3Context, id3v2_version), AV_OPT_TYPE_INT, {.i64 = 4}, 0, 4, AV_OPT_FLAG_ENCODING_PARAM},
506 { "write_id3v1", "Enable ID3v1 writing. ID3v1 tags are written in UTF-8 which may not be supported by most software.",
507 offsetof(MP3Context, write_id3v1), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM},
508 { "write_xing", "Write the Xing header containing file duration.",
509 offsetof(MP3Context, write_xing), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM},
510 { NULL },
511 };
512
513 static const AVClass mp3_muxer_class = {
514 .class_name = "MP3 muxer",
515 .item_name = av_default_item_name,
516 .option = options,
517 .version = LIBAVUTIL_VERSION_INT,
518 };
519
520 217 static int mp3_write_packet(AVFormatContext *s, AVPacket *pkt)
521 {
522 217 MP3Context *mp3 = s->priv_data;
523
524
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217 if (pkt->stream_index == mp3->audio_stream_idx) {
525
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214 if (mp3->pics_to_write) {
526 /* buffer audio packets until we get all the pictures */
527 1 int ret = avpriv_packet_list_put(&mp3->queue, pkt, NULL, 0);
528
529
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1 if (ret < 0) {
530 av_log(s, AV_LOG_WARNING, "Not enough memory to buffer audio. Skipping picture streams\n");
531 mp3->pics_to_write = 0;
532 mp3_queue_flush(s);
533 return mp3_write_audio_packet(s, pkt);
534 }
535 } else
536 213 return mp3_write_audio_packet(s, pkt);
537 } else {
538 int ret;
539
540 /* warn only once for each stream */
541
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3 if (s->streams[pkt->stream_index]->nb_frames == 1) {
542 av_log(s, AV_LOG_WARNING, "Got more than one picture in stream %d,"
543 " ignoring.\n", pkt->stream_index);
544 }
545
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3 if (!mp3->pics_to_write || s->streams[pkt->stream_index]->nb_frames >= 1)
546 return 0;
547
548
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3 if ((ret = ff_id3v2_write_apic(s, &mp3->id3, pkt)) < 0)
549 return ret;
550 3 mp3->pics_to_write--;
551
552 /* flush the buffered audio packets */
553
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4 if (!mp3->pics_to_write &&
554 1 (ret = mp3_queue_flush(s)) < 0)
555 return ret;
556 }
557
558 4 return 0;
559 }
560
561 /**
562 * Write an ID3v2 header at beginning of stream
563 */
564
565 3 static int mp3_init(struct AVFormatContext *s)
566 {
567 3 MP3Context *mp3 = s->priv_data;
568 int i;
569
570
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3 if (mp3->id3v2_version &&
571
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3 mp3->id3v2_version != 3 &&
572
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3 mp3->id3v2_version != 4) {
573 av_log(s, AV_LOG_ERROR, "Invalid ID3v2 version requested: %d. Only "
574 "3, 4 or 0 (disabled) are allowed.\n", mp3->id3v2_version);
575 return AVERROR(EINVAL);
576 }
577
578 /* check the streams -- we want exactly one audio and arbitrary number of
579 * video (attached pictures) */
580 3 mp3->audio_stream_idx = -1;
581
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9 for (i = 0; i < s->nb_streams; i++) {
582 6 AVStream *st = s->streams[i];
583
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6 if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
584
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3 if (mp3->audio_stream_idx >= 0 || st->codecpar->codec_id != AV_CODEC_ID_MP3) {
585 av_log(s, AV_LOG_ERROR, "Invalid audio stream. Exactly one MP3 "
586 "audio stream is required.\n");
587 return AVERROR(EINVAL);
588 }
589 3 mp3->audio_stream_idx = i;
590
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3 } else if (st->codecpar->codec_type != AVMEDIA_TYPE_VIDEO) {
591 av_log(s, AV_LOG_ERROR, "Only audio streams and pictures are allowed in MP3.\n");
592 return AVERROR(EINVAL);
593 }
594 }
595
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3 if (mp3->audio_stream_idx < 0) {
596 av_log(s, AV_LOG_ERROR, "No audio stream present.\n");
597 return AVERROR(EINVAL);
598 }
599 3 mp3->pics_to_write = s->nb_streams - 1;
600
601
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3 if (mp3->pics_to_write && !mp3->id3v2_version) {
602 av_log(s, AV_LOG_ERROR, "Attached pictures were requested, but the "
603 "ID3v2 header is disabled.\n");
604 return AVERROR(EINVAL);
605 }
606
607 3 return 0;
608 }
609
610 3 static int mp3_write_header(struct AVFormatContext *s)
611 {
612 3 MP3Context *mp3 = s->priv_data;
613 int ret;
614
615
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3 if (mp3->id3v2_version) {
616 3 ff_id3v2_start(&mp3->id3, s->pb, mp3->id3v2_version, ID3v2_DEFAULT_MAGIC);
617 3 ret = ff_id3v2_write_metadata(s, &mp3->id3);
618
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3 if (ret < 0)
619 return ret;
620 }
621
622
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3 if (!mp3->pics_to_write) {
623
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2 if (mp3->id3v2_version)
624 2 ff_id3v2_finish(&mp3->id3, s->pb, s->metadata_header_padding);
625 2 mp3_write_xing(s);
626 }
627
628 3 return 0;
629 }
630
631 3 static void mp3_deinit(struct AVFormatContext *s)
632 {
633 3 MP3Context *mp3 = s->priv_data;
634
635 3 avpriv_packet_list_free(&mp3->queue);
636 3 av_freep(&mp3->xing_frame);
637 3 }
638
639 const AVOutputFormat ff_mp3_muxer = {
640 .name = "mp3",
641 .long_name = NULL_IF_CONFIG_SMALL("MP3 (MPEG audio layer 3)"),
642 .mime_type = "audio/mpeg",
643 .extensions = "mp3",
644 .priv_data_size = sizeof(MP3Context),
645 .audio_codec = AV_CODEC_ID_MP3,
646 .video_codec = AV_CODEC_ID_PNG,
647 .init = mp3_init,
648 .write_header = mp3_write_header,
649 .write_packet = mp3_write_packet,
650 .write_trailer = mp3_write_trailer,
651 .deinit = mp3_deinit,
652 .query_codec = query_codec,
653 .flags = AVFMT_NOTIMESTAMPS,
654 .priv_class = &mp3_muxer_class,
655 };
656