FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/mp3enc.c
Date: 2023-12-07 21:54:23
Exec Total Coverage
Lines: 205 299 68.6%
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 "mux.h"
27 #include "rawenc.h"
28 #include "libavutil/avstring.h"
29 #include "libavcodec/mpegaudio.h"
30 #include "libavcodec/mpegaudiodata.h"
31 #include "libavcodec/mpegaudiodecheader.h"
32 #include "libavcodec/packet_internal.h"
33 #include "libavutil/intreadwrite.h"
34 #include "libavutil/opt.h"
35 #include "libavutil/dict.h"
36 #include "libavutil/avassert.h"
37 #include "libavutil/crc.h"
38 #include "libavutil/mathematics.h"
39 #include "libavutil/replaygain.h"
40
41 ✗ static int id3v1_set_string(AVFormatContext *s, const char *key,
42 uint8_t *buf, int buf_size)
43 {
44 AVDictionaryEntry *tag;
45 ✗ if ((tag = av_dict_get(s->metadata, key, NULL, 0)))
46 ✗ av_strlcpy(buf, tag->value, buf_size);
47 ✗ return !!tag;
48 }
49
50 // refer to: http://id3.org/ID3v1
51 ✗ static int id3v1_create_tag(AVFormatContext *s, uint8_t *buf)
52 {
53 AVDictionaryEntry *tag;
54 ✗ int i, count = 0;
55
56 ✗ memset(buf, 0, ID3v1_TAG_SIZE); /* fail safe */
57 ✗ buf[0] = 'T';
58 ✗ buf[1] = 'A';
59 ✗ buf[2] = 'G';
60 /* we knowingly overspecify each tag length by one byte to compensate for the mandatory null byte added by av_strlcpy */
61 ✗ count += id3v1_set_string(s, "TIT2", buf + 3, 30 + 1); //title
62 ✗ count += id3v1_set_string(s, "TPE1", buf + 33, 30 + 1); //author|artist
63 ✗ count += id3v1_set_string(s, "TALB", buf + 63, 30 + 1); //album
64 ✗ if ((tag = av_dict_get(s->metadata, "TYER", NULL, 0))) { //year
65 ✗ av_strlcpy(buf + 93, tag->value, 4 + 1);
66 ✗ count++;
67 ✗ } else if ((tag = av_dict_get(s->metadata, "TDRC", NULL, 0))) {
68 ✗ av_strlcpy(buf + 93, tag->value, 4 + 1);
69 ✗ count++;
70 ✗ } else if ((tag = av_dict_get(s->metadata, "TDAT", NULL, 0))) {
71 ✗ av_strlcpy(buf + 93, tag->value, 4 + 1);
72 ✗ count++;
73 }
74
75 ✗ count += id3v1_set_string(s, "comment", buf + 97, 30 + 1);
76 ✗ if ((tag = av_dict_get(s->metadata, "TRCK", NULL, 0))) { //track
77 ✗ buf[125] = 0;
78 ✗ buf[126] = atoi(tag->value);
79 ✗ count++;
80 }
81 ✗ buf[127] = 0xFF; /* default to unknown genre */
82 ✗ if ((tag = av_dict_get(s->metadata, "TCON", NULL, 0))) { //genre
83 ✗ for(i = 0; i <= ID3v1_GENRE_MAX; i++) {
84 ✗ if (!av_strcasecmp(tag->value, ff_id3v1_genre_str[i])) {
85 ✗ buf[127] = i;
86 ✗ count++;
87 ✗ break;
88 }
89 }
90 }
91 ✗ return count;
92 }
93
94 #define XING_NUM_BAGS 400
95 #define XING_TOC_SIZE 100
96 // size of the XING/LAME data, starting from the Xing tag
97 #define XING_SIZE 156
98
99 typedef struct MP3Context {
100 const AVClass *class;
101 ID3v2EncContext id3;
102 int id3v2_version;
103 int write_id3v1;
104 int write_xing;
105
106 /* xing header */
107 // a buffer containing the whole XING/LAME frame
108 uint8_t *xing_frame;
109 int xing_frame_size;
110
111 AVCRC audio_crc; // CRC of the audio data
112 uint32_t audio_size; // total size of the audio data
113
114 // offset of the XING/LAME frame in the file
115 int64_t xing_frame_offset;
116 // offset of the XING/INFO tag in the frame
117 int xing_offset;
118
119 int32_t frames;
120 int32_t size;
121 uint32_t want;
122 uint32_t seen;
123 uint32_t pos;
124 uint64_t bag[XING_NUM_BAGS];
125 int initial_bitrate;
126 int has_variable_bitrate;
127 int delay;
128 int padding;
129
130 /* index of the audio stream */
131 int audio_stream_idx;
132 /* number of attached pictures we still need to write */
133 int pics_to_write;
134
135 /* audio packets are queued here until we get all the attached pictures */
136 PacketList queue;
137 } MP3Context;
138
139 static const uint8_t xing_offtbl[2][2] = {{32, 17}, {17, 9}};
140
141 /*
142 * Write an empty XING header and initialize respective data.
143 */
144 3 static int mp3_write_xing(AVFormatContext *s)
145 {
146 3 MP3Context *mp3 = s->priv_data;
147 3 AVCodecParameters *par = s->streams[mp3->audio_stream_idx]->codecpar;
148 3 AVDictionaryEntry *enc = av_dict_get(s->streams[mp3->audio_stream_idx]->metadata, "encoder", NULL, 0);
149 AVIOContext *dyn_ctx;
150 int32_t header;
151 MPADecodeHeader mpah;
152 int srate_idx, i, channels;
153 int bitrate_idx;
154 3 int best_bitrate_idx = -1;
155 3 int best_bitrate_error = INT_MAX;
156 int ret;
157 3 int ver = 0;
158 int bytes_needed;
159
160
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 3 if (!(s->pb->seekable & AVIO_SEEKABLE_NORMAL) || !mp3->write_xing)
161 ✗ return 0;
162
163
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 6 for (i = 0; i < FF_ARRAY_ELEMS(ff_mpa_freq_tab); i++) {
164 6 const uint16_t base_freq = ff_mpa_freq_tab[i];
165
166
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 6 if (par->sample_rate == base_freq) ver = 0x3; // MPEG 1
167
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 3 else if (par->sample_rate == base_freq / 2) ver = 0x2; // MPEG 2
168
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 3 else if (par->sample_rate == base_freq / 4) ver = 0x0; // MPEG 2.5
169 3 else continue;
170
171 3 srate_idx = i;
172 3 break;
173 }
174
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 3 if (i == FF_ARRAY_ELEMS(ff_mpa_freq_tab)) {
175 ✗ av_log(s, AV_LOG_WARNING, "Unsupported sample rate, not writing Xing header.\n");
176 ✗ return -1;
177 }
178
179
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 3 switch (par->ch_layout.nb_channels) {
180 2 case 1: channels = MPA_MONO; break;
181 1 case 2: channels = MPA_STEREO; break;
182 ✗ default: av_log(s, AV_LOG_WARNING, "Unsupported number of channels, "
183 "not writing Xing header.\n");
184 ✗ return -1;
185 }
186
187 /* dummy MPEG audio header */
188 3 header = 0xffU << 24; // sync
189 3 header |= (0x7 << 5 | ver << 3 | 0x1 << 1 | 0x1) << 16; // sync/audio-version/layer 3/no crc*/
190 3 header |= (srate_idx << 2) << 8;
191 3 header |= channels << 6;
192
193
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 45 for (bitrate_idx = 1; bitrate_idx < 15; bitrate_idx++) {
194 42 int bit_rate = 1000 * ff_mpa_bitrate_tab[ver != 3][3 - 1][bitrate_idx];
195 42 int error = FFABS(bit_rate - par->bit_rate);
196
197
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 42 if (error < best_bitrate_error) {
198 17 best_bitrate_error = error;
199 17 best_bitrate_idx = bitrate_idx;
200 }
201 }
202
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 3 av_assert0(best_bitrate_idx >= 0);
203
204 3 for (bitrate_idx = best_bitrate_idx; ; bitrate_idx++) {
205 3 int32_t mask = bitrate_idx << (4 + 8);
206
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 3 if (15 == bitrate_idx)
207 ✗ return -1;
208 3 header |= mask;
209
210 3 ret = avpriv_mpegaudio_decode_header(&mpah, header);
211
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 3 av_assert0(ret >= 0);
212 3 mp3->xing_offset = xing_offtbl[mpah.lsf == 1][mpah.nb_channels == 1] + 4;
213 3 bytes_needed = mp3->xing_offset + XING_SIZE;
214
215
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 3 if (bytes_needed <= mpah.frame_size)
216 3 break;
217
218 ✗ header &= ~mask;
219 }
220
221 3 ret = avio_open_dyn_buf(&dyn_ctx);
222
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 3 if (ret < 0)
223 ✗ return ret;
224
225 3 avio_wb32(dyn_ctx, header);
226
227 3 ffio_fill(dyn_ctx, 0, mp3->xing_offset - 4);
228 3 ffio_wfourcc(dyn_ctx, "Xing");
229 3 avio_wb32(dyn_ctx, 0x01 | 0x02 | 0x04 | 0x08); // frames / size / TOC / vbr scale
230
231 3 mp3->size = mpah.frame_size;
232 3 mp3->want=1;
233 3 mp3->seen=0;
234 3 mp3->pos=0;
235
236 3 avio_wb32(dyn_ctx, 0); // frames
237 3 avio_wb32(dyn_ctx, 0); // size
238
239 // TOC
240
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 303 for (i = 0; i < XING_TOC_SIZE; i++)
241 300 avio_w8(dyn_ctx, (uint8_t)(255 * i / XING_TOC_SIZE));
242
243 // vbr quality
244 // we write it, because some (broken) tools always expect it to be present
245 3 avio_wb32(dyn_ctx, 0);
246
247 // encoder short version string
248
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 3 if (enc) {
249 ✗ uint8_t encoder_str[9] = { 0 };
250 ✗ if ( strlen(enc->value) > sizeof(encoder_str)
251 ✗ && !strcmp("Lavc libmp3lame", enc->value)) {
252 ✗ memcpy(encoder_str, "Lavf lame", 9);
253 } else
254 ✗ memcpy(encoder_str, enc->value, FFMIN(strlen(enc->value), sizeof(encoder_str)));
255
256 ✗ avio_write(dyn_ctx, encoder_str, sizeof(encoder_str));
257 } else
258 3 avio_write(dyn_ctx, "Lavf\0\0\0\0\0", 9);
259
260 3 avio_w8(dyn_ctx, 0); // tag revision 0 / unknown vbr method
261 3 avio_w8(dyn_ctx, 0); // unknown lowpass filter value
262 3 ffio_fill(dyn_ctx, 0, 8); // empty replaygain fields
263 3 avio_w8(dyn_ctx, 0); // unknown encoding flags
264 3 avio_w8(dyn_ctx, 0); // unknown abr/minimal bitrate
265 3 avio_wb24(dyn_ctx, 0); // empty encoder delay/padding
266
267 3 avio_w8(dyn_ctx, 0); // misc
268 3 avio_w8(dyn_ctx, 0); // mp3gain
269 3 avio_wb16(dyn_ctx, 0); // preset
270
271 // audio length and CRCs (will be updated later)
272 3 avio_wb32(dyn_ctx, 0); // music length
273 3 avio_wb16(dyn_ctx, 0); // music crc
274 3 avio_wb16(dyn_ctx, 0); // tag crc
275
276 3 ffio_fill(dyn_ctx, 0, mpah.frame_size - bytes_needed);
277
278 3 mp3->xing_frame_size = avio_close_dyn_buf(dyn_ctx, &mp3->xing_frame);
279 3 mp3->xing_frame_offset = avio_tell(s->pb);
280 3 avio_write(s->pb, mp3->xing_frame, mp3->xing_frame_size);
281
282 3 mp3->audio_size = mp3->xing_frame_size;
283
284 3 return 0;
285 }
286
287 /*
288 * Add a frame to XING data.
289 * Following lame's "VbrTag.c".
290 */
291 214 static void mp3_xing_add_frame(MP3Context *mp3, AVPacket *pkt)
292 {
293 int i;
294
295 214 mp3->frames++;
296 214 mp3->seen++;
297 214 mp3->size += pkt->size;
298
299
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 214 if (mp3->want == mp3->seen) {
300 214 mp3->bag[mp3->pos] = mp3->size;
301
302
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 214 if (XING_NUM_BAGS == ++mp3->pos) {
303 /* shrink table to half size by throwing away each second bag. */
304 ✗ for (i = 1; i < XING_NUM_BAGS; i += 2)
305 ✗ mp3->bag[i >> 1] = mp3->bag[i];
306
307 /* double wanted amount per bag. */
308 ✗ mp3->want *= 2;
309 /* adjust current position to half of table size. */
310 ✗ mp3->pos = XING_NUM_BAGS / 2;
311 }
312
313 214 mp3->seen = 0;
314 }
315 214 }
316
317 214 static int mp3_write_audio_packet(AVFormatContext *s, AVPacket *pkt)
318 {
319 214 MP3Context *mp3 = s->priv_data;
320
321
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 214 if (pkt->data && pkt->size >= 4) {
322 MPADecodeHeader mpah;
323 int ret;
324 int av_unused base;
325 uint32_t h;
326
327 214 h = AV_RB32(pkt->data);
328 214 ret = avpriv_mpegaudio_decode_header(&mpah, h);
329
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 214 if (ret >= 0) {
330
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 214 if (!mp3->initial_bitrate)
331 3 mp3->initial_bitrate = mpah.bit_rate;
332
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 214 if ((mpah.bit_rate == 0) || (mp3->initial_bitrate != mpah.bit_rate))
333 140 mp3->has_variable_bitrate = 1;
334 } else {
335 ✗ av_log(s, AV_LOG_WARNING, "Audio packet of size %d (starting with %08"PRIX32"...) "
336 "is invalid, writing it anyway.\n", pkt->size, h);
337 }
338
339 #ifdef FILTER_VBR_HEADERS
340 /* filter out XING and INFO headers. */
341 base = 4 + xing_offtbl[mpah.lsf == 1][mpah.nb_channels == 1];
342
343 if (base + 4 <= pkt->size) {
344 uint32_t v = AV_RB32(pkt->data + base);
345
346 if (MKBETAG('X','i','n','g') == v || MKBETAG('I','n','f','o') == v)
347 return 0;
348 }
349
350 /* filter out VBRI headers. */
351 base = 4 + 32;
352
353 if (base + 4 <= pkt->size && MKBETAG('V','B','R','I') == AV_RB32(pkt->data + base))
354 return 0;
355 #endif
356
357
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 214 if (mp3->xing_offset) {
358 214 uint8_t *side_data = NULL;
359 size_t side_data_size;
360
361 214 mp3_xing_add_frame(mp3, pkt);
362 214 mp3->audio_size += pkt->size;
363 428 mp3->audio_crc = av_crc(av_crc_get_table(AV_CRC_16_ANSI_LE),
364 214 mp3->audio_crc, pkt->data, pkt->size);
365
366 214 side_data = av_packet_get_side_data(pkt,
367 AV_PKT_DATA_SKIP_SAMPLES,
368 &side_data_size);
369
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 214 if (side_data && side_data_size >= 10) {
370
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 1 mp3->padding = FFMAX(AV_RL32(side_data + 4) + 528 + 1, 0);
371
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 1 if (!mp3->delay)
372
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 1 mp3->delay = FFMAX(AV_RL32(side_data) - 528 - 1, 0);
373 } else {
374 213 mp3->padding = 0;
375 }
376 }
377 }
378
379 214 return ff_raw_write_packet(s, pkt);
380 }
381
382 1 static int mp3_queue_flush(AVFormatContext *s)
383 {
384 1 MP3Context *mp3 = s->priv_data;
385 1 AVPacket *const pkt = ffformatcontext(s)->pkt;
386 1 int ret = 0, write = 1;
387
388 1 ff_id3v2_finish(&mp3->id3, s->pb, s->metadata_header_padding);
389 1 mp3_write_xing(s);
390
391
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 2 while (mp3->queue.head) {
392 1 avpriv_packet_list_get(&mp3->queue, pkt);
393
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 1 if (write && (ret = mp3_write_audio_packet(s, pkt)) < 0)
394 ✗ write = 0;
395 1 av_packet_unref(pkt);
396 }
397 1 return ret;
398 }
399
400 3 static void mp3_update_xing(AVFormatContext *s)
401 {
402 3 MP3Context *mp3 = s->priv_data;
403 const AVPacketSideData *sd;
404 AVReplayGain *rg;
405 uint16_t tag_crc;
406 uint8_t *toc;
407 int i;
408 3 int64_t old_pos = avio_tell(s->pb);
409
410 /* replace "Xing" identification string with "Info" for CBR files. */
411
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 3 if (!mp3->has_variable_bitrate)
412 2 AV_WL32(mp3->xing_frame + mp3->xing_offset, MKTAG('I', 'n', 'f', 'o'));
413
414 3 AV_WB32(mp3->xing_frame + mp3->xing_offset + 8, mp3->frames);
415 3 AV_WB32(mp3->xing_frame + mp3->xing_offset + 12, mp3->size);
416
417 3 toc = mp3->xing_frame + mp3->xing_offset + 16;
418 3 toc[0] = 0; // first toc entry has to be zero.
419
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 300 for (i = 1; i < XING_TOC_SIZE; ++i) {
420 297 int j = i * mp3->pos / XING_TOC_SIZE;
421 297 int seek_point = 256LL * mp3->bag[j] / mp3->size;
422 297 toc[i] = FFMIN(seek_point, 255);
423 }
424
425 /* write replaygain */
426 3 sd = av_packet_side_data_get(s->streams[0]->codecpar->coded_side_data,
427 3 s->streams[0]->codecpar->nb_coded_side_data,
428 AV_PKT_DATA_REPLAYGAIN);
429
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 3 if (sd && sd->size >= sizeof(*rg)) {
430 uint16_t val;
431
432 ✗ rg = (AVReplayGain *)sd->data;
433 ✗ AV_WB32(mp3->xing_frame + mp3->xing_offset + 131,
434 av_rescale(rg->track_peak, 1 << 23, 100000));
435
436 ✗ if (rg->track_gain != INT32_MIN) {
437 ✗ val = FFABS(rg->track_gain / 10000) & ((1 << 9) - 1);
438 ✗ val |= (rg->track_gain < 0) << 9;
439 ✗ val |= 1 << 13;
440 ✗ AV_WB16(mp3->xing_frame + mp3->xing_offset + 135, val);
441 }
442
443 ✗ if (rg->album_gain != INT32_MIN) {
444 ✗ val = FFABS(rg->album_gain / 10000) & ((1 << 9) - 1);
445 ✗ val |= (rg->album_gain < 0) << 9;
446 ✗ val |= 1 << 14;
447 ✗ AV_WB16(mp3->xing_frame + mp3->xing_offset + 137, val);
448 }
449 }
450
451 /* write encoder delay/padding */
452
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 3 if (mp3->delay >= 1 << 12) {
453 ✗ mp3->delay = (1 << 12) - 1;
454 ✗ av_log(s, AV_LOG_WARNING, "Too many samples of initial padding.\n");
455 }
456
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 3 if (mp3->padding >= 1 << 12) {
457 ✗ mp3->padding = (1 << 12) - 1;
458 ✗ av_log(s, AV_LOG_WARNING, "Too many samples of trailing padding.\n");
459 }
460 3 AV_WB24(mp3->xing_frame + mp3->xing_offset + 141, (mp3->delay << 12) + mp3->padding);
461
462 3 AV_WB32(mp3->xing_frame + mp3->xing_offset + XING_SIZE - 8, mp3->audio_size);
463 3 AV_WB16(mp3->xing_frame + mp3->xing_offset + XING_SIZE - 4, mp3->audio_crc);
464
465 3 tag_crc = av_crc(av_crc_get_table(AV_CRC_16_ANSI_LE), 0, mp3->xing_frame, 190);
466 3 AV_WB16(mp3->xing_frame + mp3->xing_offset + XING_SIZE - 2, tag_crc);
467
468 3 avio_seek(s->pb, mp3->xing_frame_offset, SEEK_SET);
469 3 avio_write(s->pb, mp3->xing_frame, mp3->xing_frame_size);
470 3 avio_seek(s->pb, old_pos, SEEK_SET);
471 3 }
472
473 3 static int mp3_write_trailer(struct AVFormatContext *s)
474 {
475 uint8_t buf[ID3v1_TAG_SIZE];
476 3 MP3Context *mp3 = s->priv_data;
477
478
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 3 if (mp3->pics_to_write) {
479 ✗ av_log(s, AV_LOG_WARNING, "No packets were sent for some of the "
480 "attached pictures.\n");
481 ✗ mp3_queue_flush(s);
482 }
483
484 /* write the id3v1 tag */
485
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 3 if (mp3->write_id3v1 && id3v1_create_tag(s, buf) > 0) {
486 ✗ avio_write(s->pb, buf, ID3v1_TAG_SIZE);
487 }
488
489
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 3 if (mp3->xing_offset)
490 3 mp3_update_xing(s);
491
492 3 return 0;
493 }
494
495 2 static int query_codec(enum AVCodecID id, int std_compliance)
496 {
497 2 const CodecMime *cm= ff_id3v2_mime_tags;
498
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 8 while(cm->id != AV_CODEC_ID_NONE) {
499
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 8 if(id == cm->id)
500 2 return MKTAG('A', 'P', 'I', 'C');
501 6 cm++;
502 }
503 ✗ return -1;
504 }
505
506 static const AVOption options[] = {
507 { "id3v2_version", "Select ID3v2 version to write. Currently 3 and 4 are supported.",
508 offsetof(MP3Context, id3v2_version), AV_OPT_TYPE_INT, {.i64 = 4}, 0, 4, AV_OPT_FLAG_ENCODING_PARAM},
509 { "write_id3v1", "Enable ID3v1 writing. ID3v1 tags are written in UTF-8 which may not be supported by most software.",
510 offsetof(MP3Context, write_id3v1), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM},
511 { "write_xing", "Write the Xing header containing file duration.",
512 offsetof(MP3Context, write_xing), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM},
513 { NULL },
514 };
515
516 static const AVClass mp3_muxer_class = {
517 .class_name = "MP3 muxer",
518 .item_name = av_default_item_name,
519 .option = options,
520 .version = LIBAVUTIL_VERSION_INT,
521 };
522
523 217 static int mp3_write_packet(AVFormatContext *s, AVPacket *pkt)
524 {
525 217 MP3Context *mp3 = s->priv_data;
526
527
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 217 if (pkt->stream_index == mp3->audio_stream_idx) {
528
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 214 if (mp3->pics_to_write) {
529 /* buffer audio packets until we get all the pictures */
530 1 int ret = avpriv_packet_list_put(&mp3->queue, pkt, NULL, 0);
531
532
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 1 if (ret < 0) {
533 ✗ av_log(s, AV_LOG_WARNING, "Not enough memory to buffer audio. Skipping picture streams\n");
534 ✗ mp3->pics_to_write = 0;
535 ✗ mp3_queue_flush(s);
536 ✗ return mp3_write_audio_packet(s, pkt);
537 }
538 } else
539 213 return mp3_write_audio_packet(s, pkt);
540 } else {
541 int ret;
542
543 /* warn only once for each stream */
544
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 3 if (s->streams[pkt->stream_index]->nb_frames == 1) {
545 ✗ av_log(s, AV_LOG_WARNING, "Got more than one picture in stream %d,"
546 " ignoring.\n", pkt->stream_index);
547 }
548
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 3 if (!mp3->pics_to_write || s->streams[pkt->stream_index]->nb_frames >= 1)
549 ✗ return 0;
550
551
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 3 if ((ret = ff_id3v2_write_apic(s, &mp3->id3, pkt)) < 0)
552 ✗ return ret;
553 3 mp3->pics_to_write--;
554
555 /* flush the buffered audio packets */
556
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 4 if (!mp3->pics_to_write &&
557 1 (ret = mp3_queue_flush(s)) < 0)
558 ✗ return ret;
559 }
560
561 4 return 0;
562 }
563
564 /**
565 * Write an ID3v2 header at beginning of stream
566 */
567
568 3 static int mp3_init(struct AVFormatContext *s)
569 {
570 3 MP3Context *mp3 = s->priv_data;
571 int i;
572
573
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574
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 3 mp3->id3v2_version != 3 &&
575
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 3 mp3->id3v2_version != 4) {
576 ✗ av_log(s, AV_LOG_ERROR, "Invalid ID3v2 version requested: %d. Only "
577 "3, 4 or 0 (disabled) are allowed.\n", mp3->id3v2_version);
578 ✗ return AVERROR(EINVAL);
579 }
580
581 /* check the streams -- we want exactly one audio and arbitrary number of
582 * video (attached pictures) */
583 3 mp3->audio_stream_idx = -1;
584
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 9 for (i = 0; i < s->nb_streams; i++) {
585 6 AVStream *st = s->streams[i];
586
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 6 if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
587
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 3 if (mp3->audio_stream_idx >= 0 || st->codecpar->codec_id != AV_CODEC_ID_MP3) {
588 ✗ av_log(s, AV_LOG_ERROR, "Invalid audio stream. Exactly one MP3 "
589 "audio stream is required.\n");
590 ✗ return AVERROR(EINVAL);
591 }
592 3 mp3->audio_stream_idx = i;
593
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 3 } else if (st->codecpar->codec_type != AVMEDIA_TYPE_VIDEO) {
594 ✗ av_log(s, AV_LOG_ERROR, "Only audio streams and pictures are allowed in MP3.\n");
595 ✗ return AVERROR(EINVAL);
596 }
597 }
598
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 3 if (mp3->audio_stream_idx < 0) {
599 ✗ av_log(s, AV_LOG_ERROR, "No audio stream present.\n");
600 ✗ return AVERROR(EINVAL);
601 }
602 3 mp3->pics_to_write = s->nb_streams - 1;
603
604
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 3 if (mp3->pics_to_write && !mp3->id3v2_version) {
605 ✗ av_log(s, AV_LOG_ERROR, "Attached pictures were requested, but the "
606 "ID3v2 header is disabled.\n");
607 ✗ return AVERROR(EINVAL);
608 }
609
610 3 return 0;
611 }
612
613 3 static int mp3_write_header(struct AVFormatContext *s)
614 {
615 3 MP3Context *mp3 = s->priv_data;
616 int ret;
617
618
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 3 if (mp3->id3v2_version) {
619 3 ff_id3v2_start(&mp3->id3, s->pb, mp3->id3v2_version, ID3v2_DEFAULT_MAGIC);
620 3 ret = ff_id3v2_write_metadata(s, &mp3->id3);
621
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 3 if (ret < 0)
622 ✗ return ret;
623 }
624
625
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 3 if (!mp3->pics_to_write) {
626
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 2 if (mp3->id3v2_version)
627 2 ff_id3v2_finish(&mp3->id3, s->pb, s->metadata_header_padding);
628 2 mp3_write_xing(s);
629 }
630
631 3 return 0;
632 }
633
634 3 static void mp3_deinit(struct AVFormatContext *s)
635 {
636 3 MP3Context *mp3 = s->priv_data;
637
638 3 avpriv_packet_list_free(&mp3->queue);
639 3 av_freep(&mp3->xing_frame);
640 3 }
641
642 const FFOutputFormat ff_mp3_muxer = {
643 .p.name = "mp3",
644 .p.long_name = NULL_IF_CONFIG_SMALL("MP3 (MPEG audio layer 3)"),
645 .p.mime_type = "audio/mpeg",
646 .p.extensions = "mp3",
647 .priv_data_size = sizeof(MP3Context),
648 .p.audio_codec = AV_CODEC_ID_MP3,
649 .p.video_codec = AV_CODEC_ID_PNG,
650 .init = mp3_init,
651 .write_header = mp3_write_header,
652 .write_packet = mp3_write_packet,
653 .write_trailer = mp3_write_trailer,
654 .deinit = mp3_deinit,
655 .query_codec = query_codec,
656 .p.flags = AVFMT_NOTIMESTAMPS,
657 .p.priv_class = &mp3_muxer_class,
658 };
659