| 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 "libavutil/intreadwrite.h" |
| 32 | #include "libavutil/opt.h" |
| 33 | #include "libavutil/dict.h" |
| 34 | #include "libavutil/avassert.h" |
| 35 | #include "libavutil/crc.h" |
| 36 | #include "libavutil/mathematics.h" |
| 37 | #include "libavutil/replaygain.h" |
| 38 | |
| 39 | static int id3v1_set_string(AVFormatContext *s, const char *key, |
| 40 | uint8_t *buf, int buf_size) |
| 41 | { |
| 42 | AVDictionaryEntry *tag; |
| 43 | if ((tag = av_dict_get(s->metadata, key, NULL, 0))) |
| 44 | av_strlcpy(buf, tag->value, buf_size); |
| 45 | return !!tag; |
| 46 | } |
| 47 | |
| 48 | static int id3v1_create_tag(AVFormatContext *s, uint8_t *buf) |
| 49 | { |
| 50 | AVDictionaryEntry *tag; |
| 51 | int i, count = 0; |
| 52 | |
| 53 | memset(buf, 0, ID3v1_TAG_SIZE); /* fail safe */ |
| 54 | buf[0] = 'T'; |
| 55 | buf[1] = 'A'; |
| 56 | buf[2] = 'G'; |
| 57 | /* we knowingly overspecify each tag length by one byte to compensate for the mandatory null byte added by av_strlcpy */ |
| 58 | count += id3v1_set_string(s, "TIT2", buf + 3, 30 + 1); //title |
| 59 | count += id3v1_set_string(s, "TPE1", buf + 33, 30 + 1); //author|artist |
| 60 | count += id3v1_set_string(s, "TALB", buf + 63, 30 + 1); //album |
| 61 | count += id3v1_set_string(s, "TDRC", buf + 93, 4 + 1); //date |
| 62 | count += id3v1_set_string(s, "comment", buf + 97, 30 + 1); |
| 63 | if ((tag = av_dict_get(s->metadata, "TRCK", NULL, 0))) { //track |
| 64 | buf[125] = 0; |
| 65 | buf[126] = atoi(tag->value); |
| 66 | count++; |
| 67 | } |
| 68 | buf[127] = 0xFF; /* default to unknown genre */ |
| 69 | if ((tag = av_dict_get(s->metadata, "TCON", NULL, 0))) { //genre |
| 70 | for(i = 0; i <= ID3v1_GENRE_MAX; i++) { |
| 71 | if (!av_strcasecmp(tag->value, ff_id3v1_genre_str[i])) { |
| 72 | buf[127] = i; |
| 73 | count++; |
| 74 | break; |
| 75 | } |
| 76 | } |
| 77 | } |
| 78 | return count; |
| 79 | } |
| 80 | |
| 81 | #define XING_NUM_BAGS 400 |
| 82 | #define XING_TOC_SIZE 100 |
| 83 | // size of the XING/LAME data, starting from the Xing tag |
| 84 | #define XING_SIZE 156 |
| 85 | |
| 86 | typedef struct MP3Context { |
| 87 | const AVClass *class; |
| 88 | ID3v2EncContext id3; |
| 89 | int id3v2_version; |
| 90 | int write_id3v1; |
| 91 | int write_xing; |
| 92 | |
| 93 | /* xing header */ |
| 94 | // a buffer containing the whole XING/LAME frame |
| 95 | uint8_t *xing_frame; |
| 96 | int xing_frame_size; |
| 97 | |
| 98 | AVCRC audio_crc; // CRC of the audio data |
| 99 | uint32_t audio_size; // total size of the audio data |
| 100 | |
| 101 | // offset of the XING/LAME frame in the file |
| 102 | int64_t xing_frame_offset; |
| 103 | // offset of the XING/INFO tag in the frame |
| 104 | int xing_offset; |
| 105 | |
| 106 | int32_t frames; |
| 107 | int32_t size; |
| 108 | uint32_t want; |
| 109 | uint32_t seen; |
| 110 | uint32_t pos; |
| 111 | uint64_t bag[XING_NUM_BAGS]; |
| 112 | int initial_bitrate; |
| 113 | int has_variable_bitrate; |
| 114 | |
| 115 | /* index of the audio stream */ |
| 116 | int audio_stream_idx; |
| 117 | /* number of attached pictures we still need to write */ |
| 118 | int pics_to_write; |
| 119 | |
| 120 | /* audio packets are queued here until we get all the attached pictures */ |
| 121 | AVPacketList *queue, *queue_end; |
| 122 | } MP3Context; |
| 123 | |
| 124 | static const uint8_t xing_offtbl[2][2] = {{32, 17}, {17, 9}}; |
| 125 | |
| 126 | /* |
| 127 | * Write an empty XING header and initialize respective data. |
| 128 | */ |
| 129 | static int mp3_write_xing(AVFormatContext *s) |
| 130 | { |
| 131 | MP3Context *mp3 = s->priv_data; |
| 132 | AVCodecContext *codec = s->streams[mp3->audio_stream_idx]->codec; |
| 133 | AVDictionaryEntry *enc = av_dict_get(s->streams[mp3->audio_stream_idx]->metadata, "encoder", NULL, 0); |
| 134 | AVIOContext *dyn_ctx; |
| 135 | int32_t header; |
| 136 | MPADecodeHeader mpah; |
| 137 | int srate_idx, i, channels; |
| 138 | int bitrate_idx; |
| 139 | int best_bitrate_idx = -1; |
| 140 | int best_bitrate_error = INT_MAX; |
| 141 | int ret; |
| 142 | int ver = 0; |
| 143 | int bytes_needed; |
| 144 | |
| 145 | if (!s->pb->seekable || !mp3->write_xing) |
| 146 | return 0; |
| 147 | |
| 148 | for (i = 0; i < FF_ARRAY_ELEMS(avpriv_mpa_freq_tab); i++) { |
| 149 | const uint16_t base_freq = avpriv_mpa_freq_tab[i]; |
| 150 | |
| 151 | if (codec->sample_rate == base_freq) ver = 0x3; // MPEG 1 |
| 152 | else if (codec->sample_rate == base_freq / 2) ver = 0x2; // MPEG 2 |
| 153 | else if (codec->sample_rate == base_freq / 4) ver = 0x0; // MPEG 2.5 |
| 154 | else continue; |
| 155 | |
| 156 | srate_idx = i; |
| 157 | break; |
| 158 | } |
| 159 | if (i == FF_ARRAY_ELEMS(avpriv_mpa_freq_tab)) { |
| 160 | av_log(s, AV_LOG_WARNING, "Unsupported sample rate, not writing Xing header.\n"); |
| 161 | return -1; |
| 162 | } |
| 163 | |
| 164 | switch (codec->channels) { |
| 165 | case 1: channels = MPA_MONO; break; |
| 166 | case 2: channels = MPA_STEREO; break; |
| 167 | default: av_log(s, AV_LOG_WARNING, "Unsupported number of channels, " |
| 168 | "not writing Xing header.\n"); |
| 169 | return -1; |
| 170 | } |
| 171 | |
| 172 | /* dummy MPEG audio header */ |
| 173 | header = 0xffU << 24; // sync |
| 174 | header |= (0x7 << 5 | ver << 3 | 0x1 << 1 | 0x1) << 16; // sync/audio-version/layer 3/no crc*/ |
| 175 | header |= (srate_idx << 2) << 8; |
| 176 | header |= channels << 6; |
| 177 | |
| 178 | for (bitrate_idx = 1; bitrate_idx < 15; bitrate_idx++) { |
| 179 | int bit_rate = 1000 * avpriv_mpa_bitrate_tab[ver != 3][3 - 1][bitrate_idx]; |
| 180 | int error = FFABS(bit_rate - codec->bit_rate); |
| 181 | |
| 182 | if (error < best_bitrate_error) { |
| 183 | best_bitrate_error = error; |
| 184 | best_bitrate_idx = bitrate_idx; |
| 185 | } |
| 186 | } |
| 187 | av_assert0(best_bitrate_idx >= 0); |
| 188 | |
| 189 | for (bitrate_idx = best_bitrate_idx; ; bitrate_idx++) { |
| 190 | int32_t mask = bitrate_idx << (4 + 8); |
| 191 | if (15 == bitrate_idx) |
| 192 | return -1; |
| 193 | header |= mask; |
| 194 | |
| 195 | avpriv_mpegaudio_decode_header(&mpah, header); |
| 196 | mp3->xing_offset = xing_offtbl[mpah.lsf == 1][mpah.nb_channels == 1] + 4; |
| 197 | bytes_needed = mp3->xing_offset + XING_SIZE; |
| 198 | |
| 199 | if (bytes_needed <= mpah.frame_size) |
| 200 | break; |
| 201 | |
| 202 | header &= ~mask; |
| 203 | } |
| 204 | |
| 205 | ret = avio_open_dyn_buf(&dyn_ctx); |
| 206 | if (ret < 0) |
| 207 | return ret; |
| 208 | |
| 209 | avio_wb32(dyn_ctx, header); |
| 210 | |
| 211 | ffio_fill(dyn_ctx, 0, mp3->xing_offset - 4); |
| 212 | ffio_wfourcc(dyn_ctx, "Xing"); |
| 213 | avio_wb32(dyn_ctx, 0x01 | 0x02 | 0x04 | 0x08); // frames / size / TOC / vbr scale |
| 214 | |
| 215 | mp3->size = mpah.frame_size; |
| 216 | mp3->want=1; |
| 217 | mp3->seen=0; |
| 218 | mp3->pos=0; |
| 219 | |
| 220 | avio_wb32(dyn_ctx, 0); // frames |
| 221 | avio_wb32(dyn_ctx, 0); // size |
| 222 | |
| 223 | // TOC |
| 224 | for (i = 0; i < XING_TOC_SIZE; i++) |
| 225 | avio_w8(dyn_ctx, (uint8_t)(255 * i / XING_TOC_SIZE)); |
| 226 | |
| 227 | // vbr quality |
| 228 | // we write it, because some (broken) tools always expect it to be present |
| 229 | avio_wb32(dyn_ctx, 0); |
| 230 | |
| 231 | // encoder short version string |
| 232 | if (enc) { |
| 233 | uint8_t encoder_str[9] = { 0 }; |
| 234 | if ( strlen(enc->value) > sizeof(encoder_str) |
| 235 | && !strcmp("Lavc libmp3lame", enc->value)) { |
| 236 | memcpy(encoder_str, "Lavf lame", 9); |
| 237 | } else |
| 238 | memcpy(encoder_str, enc->value, FFMIN(strlen(enc->value), sizeof(encoder_str))); |
| 239 | |
| 240 | avio_write(dyn_ctx, encoder_str, sizeof(encoder_str)); |
| 241 | } else |
| 242 | avio_write(dyn_ctx, "Lavf\0\0\0\0\0", 9); |
| 243 | |
| 244 | avio_w8(dyn_ctx, 0); // tag revision 0 / unknown vbr method |
| 245 | avio_w8(dyn_ctx, 0); // unknown lowpass filter value |
| 246 | ffio_fill(dyn_ctx, 0, 8); // empty replaygain fields |
| 247 | avio_w8(dyn_ctx, 0); // unknown encoding flags |
| 248 | avio_w8(dyn_ctx, 0); // unknown abr/minimal bitrate |
| 249 | |
| 250 | // encoder delay |
| 251 | if (codec->initial_padding - 528 - 1 >= 1 << 12) { |
| 252 | av_log(s, AV_LOG_WARNING, "Too many samples of initial padding.\n"); |
| 253 | } |
| 254 | avio_wb24(dyn_ctx, FFMAX(codec->initial_padding - 528 - 1, 0)<<12); |
| 255 | |
| 256 | avio_w8(dyn_ctx, 0); // misc |
| 257 | avio_w8(dyn_ctx, 0); // mp3gain |
| 258 | avio_wb16(dyn_ctx, 0); // preset |
| 259 | |
| 260 | // audio length and CRCs (will be updated later) |
| 261 | avio_wb32(dyn_ctx, 0); // music length |
| 262 | avio_wb16(dyn_ctx, 0); // music crc |
| 263 | avio_wb16(dyn_ctx, 0); // tag crc |
| 264 | |
| 265 | ffio_fill(dyn_ctx, 0, mpah.frame_size - bytes_needed); |
| 266 | |
| 267 | mp3->xing_frame_size = avio_close_dyn_buf(dyn_ctx, &mp3->xing_frame); |
| 268 | mp3->xing_frame_offset = avio_tell(s->pb); |
| 269 | avio_write(s->pb, mp3->xing_frame, mp3->xing_frame_size); |
| 270 | |
| 271 | mp3->audio_size = mp3->xing_frame_size; |
| 272 | |
| 273 | return 0; |
| 274 | } |
| 275 | |
| 276 | /* |
| 277 | * Add a frame to XING data. |
| 278 | * Following lame's "VbrTag.c". |
| 279 | */ |
| 280 | static void mp3_xing_add_frame(MP3Context *mp3, AVPacket *pkt) |
| 281 | { |
| 282 | int i; |
| 283 | |
| 284 | mp3->frames++; |
| 285 | mp3->seen++; |
| 286 | mp3->size += pkt->size; |
| 287 | |
| 288 | if (mp3->want == mp3->seen) { |
| 289 | mp3->bag[mp3->pos] = mp3->size; |
| 290 | |
| 291 | if (XING_NUM_BAGS == ++mp3->pos) { |
| 292 | /* shrink table to half size by throwing away each second bag. */ |
| 293 | for (i = 1; i < XING_NUM_BAGS; i += 2) |
| 294 | mp3->bag[i >> 1] = mp3->bag[i]; |
| 295 | |
| 296 | /* double wanted amount per bag. */ |
| 297 | mp3->want *= 2; |
| 298 | /* adjust current position to half of table size. */ |
| 299 | mp3->pos = XING_NUM_BAGS / 2; |
| 300 | } |
| 301 | |
| 302 | mp3->seen = 0; |
| 303 | } |
| 304 | } |
| 305 | |
| 306 | static int mp3_write_audio_packet(AVFormatContext *s, AVPacket *pkt) |
| 307 | { |
| 308 | MP3Context *mp3 = s->priv_data; |
| 309 | |
| 310 | if (pkt->data && pkt->size >= 4) { |
| 311 | MPADecodeHeader mpah; |
| 312 | int av_unused base; |
| 313 | uint32_t h; |
| 314 | |
| 315 | h = AV_RB32(pkt->data); |
| 316 | if (ff_mpa_check_header(h) == 0) { |
| 317 | avpriv_mpegaudio_decode_header(&mpah, h); |
| 318 | if (!mp3->initial_bitrate) |
| 319 | mp3->initial_bitrate = mpah.bit_rate; |
| 320 | if ((mpah.bit_rate == 0) || (mp3->initial_bitrate != mpah.bit_rate)) |
| 321 | mp3->has_variable_bitrate = 1; |
| 322 | } else { |
| 323 | av_log(s, AV_LOG_WARNING, "Audio packet of size %d (starting with %08X...) " |
| 324 | "is invalid, writing it anyway.\n", pkt->size, h); |
| 325 | } |
| 326 | |
| 327 | #ifdef FILTER_VBR_HEADERS |
| 328 | /* filter out XING and INFO headers. */ |
| 329 | base = 4 + xing_offtbl[mpah.lsf == 1][mpah.nb_channels == 1]; |
| 330 | |
| 331 | if (base + 4 <= pkt->size) { |
| 332 | uint32_t v = AV_RB32(pkt->data + base); |
| 333 | |
| 334 | if (MKBETAG('X','i','n','g') == v || MKBETAG('I','n','f','o') == v) |
| 335 | return 0; |
| 336 | } |
| 337 | |
| 338 | /* filter out VBRI headers. */ |
| 339 | base = 4 + 32; |
| 340 | |
| 341 | if (base + 4 <= pkt->size && MKBETAG('V','B','R','I') == AV_RB32(pkt->data + base)) |
| 342 | return 0; |
| 343 | #endif |
| 344 | |
| 345 | if (mp3->xing_offset) { |
| 346 | mp3_xing_add_frame(mp3, pkt); |
| 347 | mp3->audio_size += pkt->size; |
| 348 | mp3->audio_crc = av_crc(av_crc_get_table(AV_CRC_16_ANSI_LE), |
| 349 | mp3->audio_crc, pkt->data, pkt->size); |
| 350 | } |
| 351 | } |
| 352 | |
| 353 | return ff_raw_write_packet(s, pkt); |
| 354 | } |
| 355 | |
| 356 | static int mp3_queue_flush(AVFormatContext *s) |
| 357 | { |
| 358 | MP3Context *mp3 = s->priv_data; |
| 359 | AVPacketList *pktl; |
| 360 | int ret = 0, write = 1; |
| 361 | |
| 362 | ff_id3v2_finish(&mp3->id3, s->pb, s->metadata_header_padding); |
| 363 | mp3_write_xing(s); |
| 364 | |
| 365 | while ((pktl = mp3->queue)) { |
| 366 | if (write && (ret = mp3_write_audio_packet(s, &pktl->pkt)) < 0) |
| 367 | write = 0; |
| 368 | av_free_packet(&pktl->pkt); |
| 369 | mp3->queue = pktl->next; |
| 370 | av_freep(&pktl); |
| 371 | } |
| 372 | mp3->queue_end = NULL; |
| 373 | return ret; |
| 374 | } |
| 375 | |
| 376 | static void mp3_update_xing(AVFormatContext *s) |
| 377 | { |
| 378 | MP3Context *mp3 = s->priv_data; |
| 379 | AVReplayGain *rg; |
| 380 | uint16_t tag_crc; |
| 381 | uint8_t *toc; |
| 382 | int i, rg_size; |
| 383 | |
| 384 | /* replace "Xing" identification string with "Info" for CBR files. */ |
| 385 | if (!mp3->has_variable_bitrate) |
| 386 | AV_WL32(mp3->xing_frame + mp3->xing_offset, MKTAG('I', 'n', 'f', 'o')); |
| 387 | |
| 388 | AV_WB32(mp3->xing_frame + mp3->xing_offset + 8, mp3->frames); |
| 389 | AV_WB32(mp3->xing_frame + mp3->xing_offset + 12, mp3->size); |
| 390 | |
| 391 | toc = mp3->xing_frame + mp3->xing_offset + 16; |
| 392 | toc[0] = 0; // first toc entry has to be zero. |
| 393 | for (i = 1; i < XING_TOC_SIZE; ++i) { |
| 394 | int j = i * mp3->pos / XING_TOC_SIZE; |
| 395 | int seek_point = 256LL * mp3->bag[j] / mp3->size; |
| 396 | toc[i] = FFMIN(seek_point, 255); |
| 397 | } |
| 398 | |
| 399 | /* write replaygain */ |
| 400 | rg = (AVReplayGain*)av_stream_get_side_data(s->streams[0], AV_PKT_DATA_REPLAYGAIN, |
| 401 | &rg_size); |
| 402 | if (rg && rg_size >= sizeof(*rg)) { |
| 403 | uint16_t val; |
| 404 | |
| 405 | AV_WB32(mp3->xing_frame + mp3->xing_offset + 131, |
| 406 | av_rescale(rg->track_peak, 1 << 23, 100000)); |
| 407 | |
| 408 | if (rg->track_gain != INT32_MIN) { |
| 409 | val = FFABS(rg->track_gain / 10000) & ((1 << 9) - 1); |
| 410 | val |= (rg->track_gain < 0) << 9; |
| 411 | val |= 1 << 13; |
| 412 | AV_WB16(mp3->xing_frame + mp3->xing_offset + 135, val); |
| 413 | } |
| 414 | |
| 415 | if (rg->album_gain != INT32_MIN) { |
| 416 | val = FFABS(rg->album_gain / 10000) & ((1 << 9) - 1); |
| 417 | val |= (rg->album_gain < 0) << 9; |
| 418 | val |= 1 << 14; |
| 419 | AV_WB16(mp3->xing_frame + mp3->xing_offset + 137, val); |
| 420 | } |
| 421 | } |
| 422 | |
| 423 | AV_WB32(mp3->xing_frame + mp3->xing_offset + XING_SIZE - 8, mp3->audio_size); |
| 424 | AV_WB16(mp3->xing_frame + mp3->xing_offset + XING_SIZE - 4, mp3->audio_crc); |
| 425 | |
| 426 | tag_crc = av_crc(av_crc_get_table(AV_CRC_16_ANSI_LE), 0, mp3->xing_frame, 190); |
| 427 | AV_WB16(mp3->xing_frame + mp3->xing_offset + XING_SIZE - 2, tag_crc); |
| 428 | |
| 429 | avio_seek(s->pb, mp3->xing_frame_offset, SEEK_SET); |
| 430 | avio_write(s->pb, mp3->xing_frame, mp3->xing_frame_size); |
| 431 | avio_seek(s->pb, 0, SEEK_END); |
| 432 | } |
| 433 | |
| 434 | static int mp3_write_trailer(struct AVFormatContext *s) |
| 435 | { |
| 436 | uint8_t buf[ID3v1_TAG_SIZE]; |
| 437 | MP3Context *mp3 = s->priv_data; |
| 438 | |
| 439 | if (mp3->pics_to_write) { |
| 440 | av_log(s, AV_LOG_WARNING, "No packets were sent for some of the " |
| 441 | "attached pictures.\n"); |
| 442 | mp3_queue_flush(s); |
| 443 | } |
| 444 | |
| 445 | /* write the id3v1 tag */ |
| 446 | if (mp3->write_id3v1 && id3v1_create_tag(s, buf) > 0) { |
| 447 | avio_write(s->pb, buf, ID3v1_TAG_SIZE); |
| 448 | } |
| 449 | |
| 450 | if (mp3->xing_offset) |
| 451 | mp3_update_xing(s); |
| 452 | |
| 453 | av_freep(&mp3->xing_frame); |
| 454 | |
| 455 | return 0; |
| 456 | } |
| 457 | |
| 458 | static int query_codec(enum AVCodecID id, int std_compliance) |
| 459 | { |
| 460 | const CodecMime *cm= ff_id3v2_mime_tags; |
| 461 | while(cm->id != AV_CODEC_ID_NONE) { |
| 462 | if(id == cm->id) |
| 463 | return MKTAG('A', 'P', 'I', 'C'); |
| 464 | cm++; |
| 465 | } |
| 466 | return -1; |
| 467 | } |
| 468 | |
| 469 | #if CONFIG_MP2_MUXER |
| 470 | AVOutputFormat ff_mp2_muxer = { |
| 471 | .name = "mp2", |
| 472 | .long_name = NULL_IF_CONFIG_SMALL("MP2 (MPEG audio layer 2)"), |
| 473 | .mime_type = "audio/mpeg", |
| 474 | .extensions = "mp2,m2a,mpa", |
| 475 | .audio_codec = AV_CODEC_ID_MP2, |
| 476 | .video_codec = AV_CODEC_ID_NONE, |
| 477 | .write_packet = ff_raw_write_packet, |
| 478 | .flags = AVFMT_NOTIMESTAMPS, |
| 479 | }; |
| 480 | #endif |
| 481 | |
| 482 | #if CONFIG_MP3_MUXER |
| 483 | |
| 484 | static const AVOption options[] = { |
| 485 | { "id3v2_version", "Select ID3v2 version to write. Currently 3 and 4 are supported.", |
| 486 | offsetof(MP3Context, id3v2_version), AV_OPT_TYPE_INT, {.i64 = 4}, 0, 4, AV_OPT_FLAG_ENCODING_PARAM}, |
| 487 | { "write_id3v1", "Enable ID3v1 writing. ID3v1 tags are written in UTF-8 which may not be supported by most software.", |
| 488 | offsetof(MP3Context, write_id3v1), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM}, |
| 489 | { "write_xing", "Write the Xing header containing file duration.", |
| 490 | offsetof(MP3Context, write_xing), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM}, |
| 491 | { NULL }, |
| 492 | }; |
| 493 | |
| 494 | static const AVClass mp3_muxer_class = { |
| 495 | .class_name = "MP3 muxer", |
| 496 | .item_name = av_default_item_name, |
| 497 | .option = options, |
| 498 | .version = LIBAVUTIL_VERSION_INT, |
| 499 | }; |
| 500 | |
| 501 | static int mp3_write_packet(AVFormatContext *s, AVPacket *pkt) |
| 502 | { |
| 503 | MP3Context *mp3 = s->priv_data; |
| 504 | |
| 505 | if (pkt->stream_index == mp3->audio_stream_idx) { |
| 506 | if (mp3->pics_to_write) { |
| 507 | /* buffer audio packets until we get all the pictures */ |
| 508 | AVPacketList *pktl = av_mallocz(sizeof(*pktl)); |
| 509 | int ret; |
| 510 | if (!pktl) { |
| 511 | av_log(s, AV_LOG_WARNING, "Not enough memory to buffer audio. Skipping picture streams\n"); |
| 512 | mp3->pics_to_write = 0; |
| 513 | mp3_queue_flush(s); |
| 514 | return mp3_write_audio_packet(s, pkt); |
| 515 | } |
| 516 | |
| 517 | ret = av_copy_packet(&pktl->pkt, pkt); |
| 518 | if (ret < 0) { |
| 519 | av_freep(&pktl); |
| 520 | return ret; |
| 521 | } |
| 522 | |
| 523 | if (mp3->queue_end) |
| 524 | mp3->queue_end->next = pktl; |
| 525 | else |
| 526 | mp3->queue = pktl; |
| 527 | mp3->queue_end = pktl; |
| 528 | } else |
| 529 | return mp3_write_audio_packet(s, pkt); |
| 530 | } else { |
| 531 | int ret; |
| 532 | |
| 533 | /* warn only once for each stream */ |
| 534 | if (s->streams[pkt->stream_index]->nb_frames == 1) { |
| 535 | av_log(s, AV_LOG_WARNING, "Got more than one picture in stream %d," |
| 536 | " ignoring.\n", pkt->stream_index); |
| 537 | } |
| 538 | if (!mp3->pics_to_write || s->streams[pkt->stream_index]->nb_frames >= 1) |
| 539 | return 0; |
| 540 | |
| 541 | if ((ret = ff_id3v2_write_apic(s, &mp3->id3, pkt)) < 0) |
| 542 | return ret; |
| 543 | mp3->pics_to_write--; |
| 544 | |
| 545 | /* flush the buffered audio packets */ |
| 546 | if (!mp3->pics_to_write && |
| 547 | (ret = mp3_queue_flush(s)) < 0) |
| 548 | return ret; |
| 549 | } |
| 550 | |
| 551 | return 0; |
| 552 | } |
| 553 | |
| 554 | /** |
| 555 | * Write an ID3v2 header at beginning of stream |
| 556 | */ |
| 557 | |
| 558 | static int mp3_write_header(struct AVFormatContext *s) |
| 559 | { |
| 560 | MP3Context *mp3 = s->priv_data; |
| 561 | int ret, i; |
| 562 | |
| 563 | if (mp3->id3v2_version && |
| 564 | mp3->id3v2_version != 3 && |
| 565 | mp3->id3v2_version != 4) { |
| 566 | av_log(s, AV_LOG_ERROR, "Invalid ID3v2 version requested: %d. Only " |
| 567 | "3, 4 or 0 (disabled) are allowed.\n", mp3->id3v2_version); |
| 568 | return AVERROR(EINVAL); |
| 569 | } |
| 570 | |
| 571 | /* check the streams -- we want exactly one audio and arbitrary number of |
| 572 | * video (attached pictures) */ |
| 573 | mp3->audio_stream_idx = -1; |
| 574 | for (i = 0; i < s->nb_streams; i++) { |
| 575 | AVStream *st = s->streams[i]; |
| 576 | if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) { |
| 577 | if (mp3->audio_stream_idx >= 0 || st->codec->codec_id != AV_CODEC_ID_MP3) { |
| 578 | av_log(s, AV_LOG_ERROR, "Invalid audio stream. Exactly one MP3 " |
| 579 | "audio stream is required.\n"); |
| 580 | return AVERROR(EINVAL); |
| 581 | } |
| 582 | mp3->audio_stream_idx = i; |
| 583 | } else if (st->codec->codec_type != AVMEDIA_TYPE_VIDEO) { |
| 584 | av_log(s, AV_LOG_ERROR, "Only audio streams and pictures are allowed in MP3.\n"); |
| 585 | return AVERROR(EINVAL); |
| 586 | } |
| 587 | } |
| 588 | if (mp3->audio_stream_idx < 0) { |
| 589 | av_log(s, AV_LOG_ERROR, "No audio stream present.\n"); |
| 590 | return AVERROR(EINVAL); |
| 591 | } |
| 592 | mp3->pics_to_write = s->nb_streams - 1; |
| 593 | |
| 594 | if (mp3->pics_to_write && !mp3->id3v2_version) { |
| 595 | av_log(s, AV_LOG_ERROR, "Attached pictures were requested, but the " |
| 596 | "ID3v2 header is disabled.\n"); |
| 597 | return AVERROR(EINVAL); |
| 598 | } |
| 599 | |
| 600 | if (mp3->id3v2_version) { |
| 601 | ff_id3v2_start(&mp3->id3, s->pb, mp3->id3v2_version, ID3v2_DEFAULT_MAGIC); |
| 602 | ret = ff_id3v2_write_metadata(s, &mp3->id3); |
| 603 | if (ret < 0) |
| 604 | return ret; |
| 605 | } |
| 606 | |
| 607 | if (!mp3->pics_to_write) { |
| 608 | if (mp3->id3v2_version) |
| 609 | ff_id3v2_finish(&mp3->id3, s->pb, s->metadata_header_padding); |
| 610 | mp3_write_xing(s); |
| 611 | } |
| 612 | |
| 613 | return 0; |
| 614 | } |
| 615 | |
| 616 | AVOutputFormat ff_mp3_muxer = { |
| 617 | .name = "mp3", |
| 618 | .long_name = NULL_IF_CONFIG_SMALL("MP3 (MPEG audio layer 3)"), |
| 619 | .mime_type = "audio/mpeg", |
| 620 | .extensions = "mp3", |
| 621 | .priv_data_size = sizeof(MP3Context), |
| 622 | .audio_codec = AV_CODEC_ID_MP3, |
| 623 | .video_codec = AV_CODEC_ID_PNG, |
| 624 | .write_header = mp3_write_header, |
| 625 | .write_packet = mp3_write_packet, |
| 626 | .write_trailer = mp3_write_trailer, |
| 627 | .query_codec = query_codec, |
| 628 | .flags = AVFMT_NOTIMESTAMPS, |
| 629 | .priv_class = &mp3_muxer_class, |
| 630 | }; |
| 631 | #endif |