1/* 2 * nut muxer 3 * Copyright (c) 2004-2007 Michael Niedermayer 4 * 5 * This file is part of Libav. 6 * 7 * Libav 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 * Libav 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 Libav; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22#include "libavutil/intreadwrite.h" 23#include "libavutil/mathematics.h" 24#include "libavutil/tree.h" 25#include "libavutil/dict.h" 26#include "libavcodec/mpegaudiodata.h" 27#include "nut.h" 28#include "internal.h" 29#include "avio_internal.h" 30 31static int find_expected_header(AVCodecContext *c, int size, int key_frame, uint8_t out[64]){ 32 int sample_rate= c->sample_rate; 33 34 if(size>4096) 35 return 0; 36 37 AV_WB24(out, 1); 38 39 if(c->codec_id == CODEC_ID_MPEG4){ 40 if(key_frame){ 41 return 3; 42 }else{ 43 out[3]= 0xB6; 44 return 4; 45 } 46 }else if(c->codec_id == CODEC_ID_MPEG1VIDEO || c->codec_id == CODEC_ID_MPEG2VIDEO){ 47 return 3; 48 }else if(c->codec_id == CODEC_ID_H264){ 49 return 3; 50 }else if(c->codec_id == CODEC_ID_MP3 || c->codec_id == CODEC_ID_MP2){ 51 int lsf, mpeg25, sample_rate_index, bitrate_index, frame_size; 52 int layer= c->codec_id == CODEC_ID_MP3 ? 3 : 2; 53 unsigned int header= 0xFFF00000; 54 55 lsf = sample_rate < (24000+32000)/2; 56 mpeg25 = sample_rate < (12000+16000)/2; 57 sample_rate <<= lsf + mpeg25; 58 if (sample_rate < (32000 + 44100)/2) sample_rate_index=2; 59 else if(sample_rate < (44100 + 48000)/2) sample_rate_index=0; 60 else sample_rate_index=1; 61 62 sample_rate= avpriv_mpa_freq_tab[sample_rate_index] >> (lsf + mpeg25); 63 64 for(bitrate_index=2; bitrate_index<30; bitrate_index++){ 65 frame_size = avpriv_mpa_bitrate_tab[lsf][layer-1][bitrate_index>>1]; 66 frame_size = (frame_size * 144000) / (sample_rate << lsf) + (bitrate_index&1); 67 68 if(frame_size == size) 69 break; 70 } 71 72 header |= (!lsf)<<19; 73 header |= (4-layer)<<17; 74 header |= 1<<16; //no crc 75 AV_WB32(out, header); 76 if(size <= 0) 77 return 2; //we guess there is no crc, if there is one the user clearly does not care about overhead 78 if(bitrate_index == 30) 79 return -1; //something is wrong ... 80 81 header |= (bitrate_index>>1)<<12; 82 header |= sample_rate_index<<10; 83 header |= (bitrate_index&1)<<9; 84 85 return 2; //FIXME actually put the needed ones in build_elision_headers() 86 return 3; //we guess that the private bit is not set 87//FIXME the above assumptions should be checked, if these turn out false too often something should be done 88 } 89 return 0; 90} 91 92static int find_header_idx(AVFormatContext *s, AVCodecContext *c, int size, int frame_type){ 93 NUTContext *nut = s->priv_data; 94 uint8_t out[64]; 95 int i; 96 int len= find_expected_header(c, size, frame_type, out); 97 98//av_log(NULL, AV_LOG_ERROR, "expected_h len=%d size=%d codec_id=%d\n", len, size, c->codec_id); 99 100 for(i=1; i<nut->header_count; i++){ 101 if( len == nut->header_len[i] 102 && !memcmp(out, nut->header[i], len)){ 103// av_log(NULL, AV_LOG_ERROR, "found %d\n", i); 104 return i; 105 } 106 } 107// av_log(NULL, AV_LOG_ERROR, "nothing found\n"); 108 return 0; 109} 110 111static void build_elision_headers(AVFormatContext *s){ 112 NUTContext *nut = s->priv_data; 113 int i; 114 //FIXME this is lame 115 //FIXME write a 2pass mode to find the maximal headers 116 static const uint8_t headers[][5]={ 117 {3, 0x00, 0x00, 0x01}, 118 {4, 0x00, 0x00, 0x01, 0xB6}, 119 {2, 0xFF, 0xFA}, //mp3+crc 120 {2, 0xFF, 0xFB}, //mp3 121 {2, 0xFF, 0xFC}, //mp2+crc 122 {2, 0xFF, 0xFD}, //mp2 123 }; 124 125 nut->header_count= 7; 126 for(i=1; i<nut->header_count; i++){ 127 nut->header_len[i]= headers[i-1][0]; 128 nut->header [i]= &headers[i-1][1]; 129 } 130} 131 132static void build_frame_code(AVFormatContext *s){ 133 NUTContext *nut = s->priv_data; 134 int key_frame, index, pred, stream_id; 135 int start=1; 136 int end= 254; 137 int keyframe_0_esc= s->nb_streams > 2; 138 int pred_table[10]; 139 FrameCode *ft; 140 141 ft= &nut->frame_code[start]; 142 ft->flags= FLAG_CODED; 143 ft->size_mul=1; 144 ft->pts_delta=1; 145 start++; 146 147 if(keyframe_0_esc){ 148 /* keyframe = 0 escape */ 149 FrameCode *ft= &nut->frame_code[start]; 150 ft->flags= FLAG_STREAM_ID | FLAG_SIZE_MSB | FLAG_CODED_PTS; 151 ft->size_mul=1; 152 start++; 153 } 154 155 for(stream_id= 0; stream_id<s->nb_streams; stream_id++){ 156 int start2= start + (end-start)*stream_id / s->nb_streams; 157 int end2 = start + (end-start)*(stream_id+1) / s->nb_streams; 158 AVCodecContext *codec = s->streams[stream_id]->codec; 159 int is_audio= codec->codec_type == AVMEDIA_TYPE_AUDIO; 160 int intra_only= /*codec->intra_only || */is_audio; 161 int pred_count; 162 163 for(key_frame=0; key_frame<2; key_frame++){ 164 if(intra_only && keyframe_0_esc && key_frame==0) 165 continue; 166 167 { 168 FrameCode *ft= &nut->frame_code[start2]; 169 ft->flags= FLAG_KEY*key_frame; 170 ft->flags|= FLAG_SIZE_MSB | FLAG_CODED_PTS; 171 ft->stream_id= stream_id; 172 ft->size_mul=1; 173 if(is_audio) 174 ft->header_idx= find_header_idx(s, codec, -1, key_frame); 175 start2++; 176 } 177 } 178 179 key_frame= intra_only; 180 if(is_audio){ 181 int frame_bytes= codec->frame_size*(int64_t)codec->bit_rate / (8*codec->sample_rate); 182 int pts; 183 for(pts=0; pts<2; pts++){ 184 for(pred=0; pred<2; pred++){ 185 FrameCode *ft= &nut->frame_code[start2]; 186 ft->flags= FLAG_KEY*key_frame; 187 ft->stream_id= stream_id; 188 ft->size_mul=frame_bytes + 2; 189 ft->size_lsb=frame_bytes + pred; 190 ft->pts_delta=pts; 191 ft->header_idx= find_header_idx(s, codec, frame_bytes + pred, key_frame); 192 start2++; 193 } 194 } 195 }else{ 196 FrameCode *ft= &nut->frame_code[start2]; 197 ft->flags= FLAG_KEY | FLAG_SIZE_MSB; 198 ft->stream_id= stream_id; 199 ft->size_mul=1; 200 ft->pts_delta=1; 201 start2++; 202 } 203 204 if(codec->has_b_frames){ 205 pred_count=5; 206 pred_table[0]=-2; 207 pred_table[1]=-1; 208 pred_table[2]=1; 209 pred_table[3]=3; 210 pred_table[4]=4; 211 }else if(codec->codec_id == CODEC_ID_VORBIS){ 212 pred_count=3; 213 pred_table[0]=2; 214 pred_table[1]=9; 215 pred_table[2]=16; 216 }else{ 217 pred_count=1; 218 pred_table[0]=1; 219 } 220 221 for(pred=0; pred<pred_count; pred++){ 222 int start3= start2 + (end2-start2)*pred / pred_count; 223 int end3 = start2 + (end2-start2)*(pred+1) / pred_count; 224 225 for(index=start3; index<end3; index++){ 226 FrameCode *ft= &nut->frame_code[index]; 227 ft->flags= FLAG_KEY*key_frame; 228 ft->flags|= FLAG_SIZE_MSB; 229 ft->stream_id= stream_id; 230//FIXME use single byte size and pred from last 231 ft->size_mul= end3-start3; 232 ft->size_lsb= index - start3; 233 ft->pts_delta= pred_table[pred]; 234 if(is_audio) 235 ft->header_idx= find_header_idx(s, codec, -1, key_frame); 236 } 237 } 238 } 239 memmove(&nut->frame_code['N'+1], &nut->frame_code['N'], sizeof(FrameCode)*(255-'N')); 240 nut->frame_code[ 0].flags= 241 nut->frame_code[255].flags= 242 nut->frame_code['N'].flags= FLAG_INVALID; 243} 244 245static void put_tt(NUTContext *nut, AVRational *time_base, AVIOContext *bc, uint64_t val){ 246 val *= nut->time_base_count; 247 val += time_base - nut->time_base; 248 ff_put_v(bc, val); 249} 250 251/** 252 * Store a string as vb. 253 */ 254static void put_str(AVIOContext *bc, const char *string){ 255 int len= strlen(string); 256 257 ff_put_v(bc, len); 258 avio_write(bc, string, len); 259} 260 261static void put_s(AVIOContext *bc, int64_t val){ 262 ff_put_v(bc, 2*FFABS(val) - (val>0)); 263} 264 265#ifdef TRACE 266static inline void ff_put_v_trace(AVIOContext *bc, uint64_t v, char *file, char *func, int line){ 267 av_log(NULL, AV_LOG_DEBUG, "ff_put_v %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line); 268 269 ff_put_v(bc, v); 270} 271 272static inline void put_s_trace(AVIOContext *bc, int64_t v, char *file, char *func, int line){ 273 av_log(NULL, AV_LOG_DEBUG, "put_s %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line); 274 275 put_s(bc, v); 276} 277#define ff_put_v(bc, v) ff_put_v_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__) 278#define put_s(bc, v) put_s_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__) 279#endif 280 281//FIXME remove calculate_checksum 282static void put_packet(NUTContext *nut, AVIOContext *bc, AVIOContext *dyn_bc, int calculate_checksum, uint64_t startcode){ 283 uint8_t *dyn_buf=NULL; 284 int dyn_size= avio_close_dyn_buf(dyn_bc, &dyn_buf); 285 int forw_ptr= dyn_size + 4*calculate_checksum; 286 287 if(forw_ptr > 4096) 288 ffio_init_checksum(bc, ff_crc04C11DB7_update, 0); 289 avio_wb64(bc, startcode); 290 ff_put_v(bc, forw_ptr); 291 if(forw_ptr > 4096) 292 avio_wl32(bc, ffio_get_checksum(bc)); 293 294 if(calculate_checksum) 295 ffio_init_checksum(bc, ff_crc04C11DB7_update, 0); 296 avio_write(bc, dyn_buf, dyn_size); 297 if(calculate_checksum) 298 avio_wl32(bc, ffio_get_checksum(bc)); 299 300 av_free(dyn_buf); 301} 302 303static void write_mainheader(NUTContext *nut, AVIOContext *bc){ 304 int i, j, tmp_pts, tmp_flags, tmp_stream, tmp_mul, tmp_size, tmp_fields, tmp_head_idx; 305 int64_t tmp_match; 306 307 ff_put_v(bc, 3); /* version */ 308 ff_put_v(bc, nut->avf->nb_streams); 309 ff_put_v(bc, nut->max_distance); 310 ff_put_v(bc, nut->time_base_count); 311 312 for(i=0; i<nut->time_base_count; i++){ 313 ff_put_v(bc, nut->time_base[i].num); 314 ff_put_v(bc, nut->time_base[i].den); 315 } 316 317 tmp_pts=0; 318 tmp_mul=1; 319 tmp_stream=0; 320 tmp_match= 1-(1LL<<62); 321 tmp_head_idx= 0; 322 for(i=0; i<256;){ 323 tmp_fields=0; 324 tmp_size=0; 325// tmp_res=0; 326 if(tmp_pts != nut->frame_code[i].pts_delta) tmp_fields=1; 327 if(tmp_mul != nut->frame_code[i].size_mul ) tmp_fields=2; 328 if(tmp_stream != nut->frame_code[i].stream_id) tmp_fields=3; 329 if(tmp_size != nut->frame_code[i].size_lsb ) tmp_fields=4; 330// if(tmp_res != nut->frame_code[i].res ) tmp_fields=5; 331 if(tmp_head_idx!=nut->frame_code[i].header_idx)tmp_fields=8; 332 333 tmp_pts = nut->frame_code[i].pts_delta; 334 tmp_flags = nut->frame_code[i].flags; 335 tmp_stream= nut->frame_code[i].stream_id; 336 tmp_mul = nut->frame_code[i].size_mul; 337 tmp_size = nut->frame_code[i].size_lsb; 338// tmp_res = nut->frame_code[i].res; 339 tmp_head_idx= nut->frame_code[i].header_idx; 340 341 for(j=0; i<256; j++,i++){ 342 if(i == 'N'){ 343 j--; 344 continue; 345 } 346 if(nut->frame_code[i].pts_delta != tmp_pts ) break; 347 if(nut->frame_code[i].flags != tmp_flags ) break; 348 if(nut->frame_code[i].stream_id != tmp_stream) break; 349 if(nut->frame_code[i].size_mul != tmp_mul ) break; 350 if(nut->frame_code[i].size_lsb != tmp_size+j) break; 351// if(nut->frame_code[i].res != tmp_res ) break; 352 if(nut->frame_code[i].header_idx!= tmp_head_idx) break; 353 } 354 if(j != tmp_mul - tmp_size) tmp_fields=6; 355 356 ff_put_v(bc, tmp_flags); 357 ff_put_v(bc, tmp_fields); 358 if(tmp_fields>0) put_s(bc, tmp_pts); 359 if(tmp_fields>1) ff_put_v(bc, tmp_mul); 360 if(tmp_fields>2) ff_put_v(bc, tmp_stream); 361 if(tmp_fields>3) ff_put_v(bc, tmp_size); 362 if(tmp_fields>4) ff_put_v(bc, 0 /*tmp_res*/); 363 if(tmp_fields>5) ff_put_v(bc, j); 364 if(tmp_fields>6) ff_put_v(bc, tmp_match); 365 if(tmp_fields>7) ff_put_v(bc, tmp_head_idx); 366 } 367 ff_put_v(bc, nut->header_count-1); 368 for(i=1; i<nut->header_count; i++){ 369 ff_put_v(bc, nut->header_len[i]); 370 avio_write(bc, nut->header[i], nut->header_len[i]); 371 } 372} 373 374static int write_streamheader(AVFormatContext *avctx, AVIOContext *bc, AVStream *st, int i){ 375 NUTContext *nut = avctx->priv_data; 376 AVCodecContext *codec = st->codec; 377 ff_put_v(bc, i); 378 switch(codec->codec_type){ 379 case AVMEDIA_TYPE_VIDEO: ff_put_v(bc, 0); break; 380 case AVMEDIA_TYPE_AUDIO: ff_put_v(bc, 1); break; 381 case AVMEDIA_TYPE_SUBTITLE: ff_put_v(bc, 2); break; 382 default : ff_put_v(bc, 3); break; 383 } 384 ff_put_v(bc, 4); 385 if (codec->codec_tag){ 386 avio_wl32(bc, codec->codec_tag); 387 } else { 388 av_log(avctx, AV_LOG_ERROR, "No codec tag defined for stream %d\n", i); 389 return AVERROR(EINVAL); 390 } 391 392 ff_put_v(bc, nut->stream[i].time_base - nut->time_base); 393 ff_put_v(bc, nut->stream[i].msb_pts_shift); 394 ff_put_v(bc, nut->stream[i].max_pts_distance); 395 ff_put_v(bc, codec->has_b_frames); 396 avio_w8(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */ 397 398 ff_put_v(bc, codec->extradata_size); 399 avio_write(bc, codec->extradata, codec->extradata_size); 400 401 switch(codec->codec_type){ 402 case AVMEDIA_TYPE_AUDIO: 403 ff_put_v(bc, codec->sample_rate); 404 ff_put_v(bc, 1); 405 ff_put_v(bc, codec->channels); 406 break; 407 case AVMEDIA_TYPE_VIDEO: 408 ff_put_v(bc, codec->width); 409 ff_put_v(bc, codec->height); 410 411 if(st->sample_aspect_ratio.num<=0 || st->sample_aspect_ratio.den<=0){ 412 ff_put_v(bc, 0); 413 ff_put_v(bc, 0); 414 }else{ 415 ff_put_v(bc, st->sample_aspect_ratio.num); 416 ff_put_v(bc, st->sample_aspect_ratio.den); 417 } 418 ff_put_v(bc, 0); /* csp type -- unknown */ 419 break; 420 default: 421 break; 422 } 423 return 0; 424} 425 426static int add_info(AVIOContext *bc, const char *type, const char *value){ 427 put_str(bc, type); 428 put_s(bc, -1); 429 put_str(bc, value); 430 return 1; 431} 432 433static int write_globalinfo(NUTContext *nut, AVIOContext *bc){ 434 AVFormatContext *s= nut->avf; 435 AVDictionaryEntry *t = NULL; 436 AVIOContext *dyn_bc; 437 uint8_t *dyn_buf=NULL; 438 int count=0, dyn_size; 439 int ret = avio_open_dyn_buf(&dyn_bc); 440 if(ret < 0) 441 return ret; 442 443 while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) 444 count += add_info(dyn_bc, t->key, t->value); 445 446 ff_put_v(bc, 0); //stream_if_plus1 447 ff_put_v(bc, 0); //chapter_id 448 ff_put_v(bc, 0); //timestamp_start 449 ff_put_v(bc, 0); //length 450 451 ff_put_v(bc, count); 452 453 dyn_size= avio_close_dyn_buf(dyn_bc, &dyn_buf); 454 avio_write(bc, dyn_buf, dyn_size); 455 av_free(dyn_buf); 456 return 0; 457} 458 459static int write_streaminfo(NUTContext *nut, AVIOContext *bc, int stream_id){ 460 AVFormatContext *s= nut->avf; 461 AVStream* st = s->streams[stream_id]; 462 AVIOContext *dyn_bc; 463 uint8_t *dyn_buf=NULL; 464 int count=0, dyn_size, i; 465 int ret = avio_open_dyn_buf(&dyn_bc); 466 if(ret < 0) 467 return ret; 468 469 for (i=0; ff_nut_dispositions[i].flag; ++i) { 470 if (st->disposition & ff_nut_dispositions[i].flag) 471 count += add_info(dyn_bc, "Disposition", ff_nut_dispositions[i].str); 472 } 473 dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf); 474 475 if (count) { 476 ff_put_v(bc, stream_id + 1); //stream_id_plus1 477 ff_put_v(bc, 0); //chapter_id 478 ff_put_v(bc, 0); //timestamp_start 479 ff_put_v(bc, 0); //length 480 481 ff_put_v(bc, count); 482 483 avio_write(bc, dyn_buf, dyn_size); 484 } 485 486 av_free(dyn_buf); 487 return count; 488} 489 490static int write_chapter(NUTContext *nut, AVIOContext *bc, int id) 491{ 492 AVIOContext *dyn_bc; 493 uint8_t *dyn_buf = NULL; 494 AVDictionaryEntry *t = NULL; 495 AVChapter *ch = nut->avf->chapters[id]; 496 int ret, dyn_size, count = 0; 497 498 ret = avio_open_dyn_buf(&dyn_bc); 499 if (ret < 0) 500 return ret; 501 502 ff_put_v(bc, 0); // stream_id_plus1 503 put_s(bc, id + 1); // chapter_id 504 put_tt(nut, nut->chapter[id].time_base, bc, ch->start); // chapter_start 505 ff_put_v(bc, ch->end - ch->start); // chapter_len 506 507 while ((t = av_dict_get(ch->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) 508 count += add_info(dyn_bc, t->key, t->value); 509 510 ff_put_v(bc, count); 511 512 dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf); 513 avio_write(bc, dyn_buf, dyn_size); 514 av_freep(&dyn_buf); 515 return 0; 516} 517 518static int write_headers(AVFormatContext *avctx, AVIOContext *bc){ 519 NUTContext *nut = avctx->priv_data; 520 AVIOContext *dyn_bc; 521 int i, ret; 522 523 ff_metadata_conv_ctx(avctx, ff_nut_metadata_conv, NULL); 524 525 ret = avio_open_dyn_buf(&dyn_bc); 526 if(ret < 0) 527 return ret; 528 write_mainheader(nut, dyn_bc); 529 put_packet(nut, bc, dyn_bc, 1, MAIN_STARTCODE); 530 531 for (i=0; i < nut->avf->nb_streams; i++){ 532 ret = avio_open_dyn_buf(&dyn_bc); 533 if(ret < 0) 534 return ret; 535 if ((ret = write_streamheader(avctx, dyn_bc, nut->avf->streams[i], i)) < 0) 536 return ret; 537 put_packet(nut, bc, dyn_bc, 1, STREAM_STARTCODE); 538 } 539 540 ret = avio_open_dyn_buf(&dyn_bc); 541 if(ret < 0) 542 return ret; 543 write_globalinfo(nut, dyn_bc); 544 put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE); 545 546 for (i = 0; i < nut->avf->nb_streams; i++) { 547 ret = avio_open_dyn_buf(&dyn_bc); 548 if(ret < 0) 549 return ret; 550 ret = write_streaminfo(nut, dyn_bc, i); 551 if (ret < 0) 552 return ret; 553 if (ret > 0) 554 put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE); 555 else { 556 uint8_t* buf; 557 avio_close_dyn_buf(dyn_bc, &buf); 558 av_free(buf); 559 } 560 } 561 562 for (i = 0; i < nut->avf->nb_chapters; i++) { 563 ret = avio_open_dyn_buf(&dyn_bc); 564 if (ret < 0) 565 return ret; 566 ret = write_chapter(nut, dyn_bc, i); 567 if (ret < 0) { 568 uint8_t *buf; 569 avio_close_dyn_buf(dyn_bc, &buf); 570 av_freep(&buf); 571 return ret; 572 } 573 put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE); 574 } 575 576 nut->last_syncpoint_pos= INT_MIN; 577 nut->header_count++; 578 return 0; 579} 580 581static int nut_write_header(AVFormatContext *s){ 582 NUTContext *nut = s->priv_data; 583 AVIOContext *bc = s->pb; 584 int i, j, ret; 585 586 nut->avf= s; 587 588 nut->stream = av_mallocz(sizeof(StreamContext)*s->nb_streams); 589 if (s->nb_chapters) 590 nut->chapter = av_mallocz(sizeof(ChapterContext)*s->nb_chapters); 591 nut->time_base= av_mallocz(sizeof(AVRational )*(s->nb_streams + 592 s->nb_chapters)); 593 if (!nut->stream || (s->nb_chapters && !nut->chapter) || !nut->time_base) { 594 av_freep(&nut->stream); 595 av_freep(&nut->chapter); 596 av_freep(&nut->time_base); 597 return AVERROR(ENOMEM); 598 } 599 600 for(i=0; i<s->nb_streams; i++){ 601 AVStream *st= s->streams[i]; 602 int ssize; 603 AVRational time_base; 604 ff_parse_specific_params(st->codec, &time_base.den, &ssize, &time_base.num); 605 606 avpriv_set_pts_info(st, 64, time_base.num, time_base.den); 607 608 for(j=0; j<nut->time_base_count; j++){ 609 if(!memcmp(&time_base, &nut->time_base[j], sizeof(AVRational))){ 610 break; 611 } 612 } 613 nut->time_base[j]= time_base; 614 nut->stream[i].time_base= &nut->time_base[j]; 615 if(j==nut->time_base_count) 616 nut->time_base_count++; 617 618 if(INT64_C(1000) * time_base.num >= time_base.den) 619 nut->stream[i].msb_pts_shift = 7; 620 else 621 nut->stream[i].msb_pts_shift = 14; 622 nut->stream[i].max_pts_distance= FFMAX(time_base.den, time_base.num) / time_base.num; 623 } 624 625 for (i = 0; i < s->nb_chapters; i++) { 626 AVChapter *ch = s->chapters[i]; 627 628 for (j = 0; j < nut->time_base_count; j++) { 629 if (!memcmp(&ch->time_base, &nut->time_base[j], sizeof(AVRational))) 630 break; 631 } 632 633 nut->time_base[j] = ch->time_base; 634 nut->chapter[i].time_base = &nut->time_base[j]; 635 if(j == nut->time_base_count) 636 nut->time_base_count++; 637 } 638 639 nut->max_distance = MAX_DISTANCE; 640 build_elision_headers(s); 641 build_frame_code(s); 642 assert(nut->frame_code['N'].flags == FLAG_INVALID); 643 644 avio_write(bc, ID_STRING, strlen(ID_STRING)); 645 avio_w8(bc, 0); 646 647 if ((ret = write_headers(s, bc)) < 0) 648 return ret; 649 650 avio_flush(bc); 651 652 //FIXME index 653 654 return 0; 655} 656 657static int get_needed_flags(NUTContext *nut, StreamContext *nus, FrameCode *fc, AVPacket *pkt){ 658 int flags= 0; 659 660 if(pkt->flags & AV_PKT_FLAG_KEY ) flags |= FLAG_KEY; 661 if(pkt->stream_index != fc->stream_id ) flags |= FLAG_STREAM_ID; 662 if(pkt->size / fc->size_mul ) flags |= FLAG_SIZE_MSB; 663 if(pkt->pts - nus->last_pts != fc->pts_delta) flags |= FLAG_CODED_PTS; 664 if(pkt->size > 2*nut->max_distance ) flags |= FLAG_CHECKSUM; 665 if(FFABS(pkt->pts - nus->last_pts) 666 > nus->max_pts_distance) flags |= FLAG_CHECKSUM; 667 if( pkt->size < nut->header_len[fc->header_idx] 668 || (pkt->size > 4096 && fc->header_idx) 669 || memcmp(pkt->data, nut->header[fc->header_idx], nut->header_len[fc->header_idx])) 670 flags |= FLAG_HEADER_IDX; 671 672 return flags | (fc->flags & FLAG_CODED); 673} 674 675static int find_best_header_idx(NUTContext *nut, AVPacket *pkt){ 676 int i; 677 int best_i = 0; 678 int best_len= 0; 679 680 if(pkt->size > 4096) 681 return 0; 682 683 for(i=1; i<nut->header_count; i++){ 684 if( pkt->size >= nut->header_len[i] 685 && nut->header_len[i] > best_len 686 && !memcmp(pkt->data, nut->header[i], nut->header_len[i])){ 687 best_i= i; 688 best_len= nut->header_len[i]; 689 } 690 } 691 return best_i; 692} 693 694static int nut_write_packet(AVFormatContext *s, AVPacket *pkt){ 695 NUTContext *nut = s->priv_data; 696 StreamContext *nus= &nut->stream[pkt->stream_index]; 697 AVIOContext *bc = s->pb, *dyn_bc; 698 FrameCode *fc; 699 int64_t coded_pts; 700 int best_length, frame_code, flags, needed_flags, i, header_idx, best_header_idx; 701 int key_frame = !!(pkt->flags & AV_PKT_FLAG_KEY); 702 int store_sp=0; 703 int ret; 704 705 if(pkt->pts < 0) 706 return -1; 707 708 if(1LL<<(20+3*nut->header_count) <= avio_tell(bc)) 709 write_headers(s, bc); 710 711 if(key_frame && !(nus->last_flags & FLAG_KEY)) 712 store_sp= 1; 713 714 if(pkt->size + 30/*FIXME check*/ + avio_tell(bc) >= nut->last_syncpoint_pos + nut->max_distance) 715 store_sp= 1; 716 717//FIXME: Ensure store_sp is 1 in the first place. 718 719 if(store_sp){ 720 Syncpoint *sp, dummy= {.pos= INT64_MAX}; 721 722 ff_nut_reset_ts(nut, *nus->time_base, pkt->dts); 723 for(i=0; i<s->nb_streams; i++){ 724 AVStream *st= s->streams[i]; 725 int64_t dts_tb = av_rescale_rnd(pkt->dts, 726 nus->time_base->num * (int64_t)nut->stream[i].time_base->den, 727 nus->time_base->den * (int64_t)nut->stream[i].time_base->num, 728 AV_ROUND_DOWN); 729 int index= av_index_search_timestamp(st, dts_tb, AVSEEK_FLAG_BACKWARD); 730 if(index>=0) dummy.pos= FFMIN(dummy.pos, st->index_entries[index].pos); 731 } 732 if(dummy.pos == INT64_MAX) 733 dummy.pos= 0; 734 sp= av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp, 735 NULL); 736 737 nut->last_syncpoint_pos= avio_tell(bc); 738 ret = avio_open_dyn_buf(&dyn_bc); 739 if(ret < 0) 740 return ret; 741 put_tt(nut, nus->time_base, dyn_bc, pkt->dts); 742 ff_put_v(dyn_bc, sp ? (nut->last_syncpoint_pos - sp->pos)>>4 : 0); 743 put_packet(nut, bc, dyn_bc, 1, SYNCPOINT_STARTCODE); 744 745 ff_nut_add_sp(nut, nut->last_syncpoint_pos, 0/*unused*/, pkt->dts); 746 } 747 assert(nus->last_pts != AV_NOPTS_VALUE); 748 749 coded_pts = pkt->pts & ((1<<nus->msb_pts_shift)-1); 750 if(ff_lsb2full(nus, coded_pts) != pkt->pts) 751 coded_pts= pkt->pts + (1<<nus->msb_pts_shift); 752 753 best_header_idx= find_best_header_idx(nut, pkt); 754 755 best_length=INT_MAX; 756 frame_code= -1; 757 for(i=0; i<256; i++){ 758 int length= 0; 759 FrameCode *fc= &nut->frame_code[i]; 760 int flags= fc->flags; 761 762 if(flags & FLAG_INVALID) 763 continue; 764 needed_flags= get_needed_flags(nut, nus, fc, pkt); 765 766 if(flags & FLAG_CODED){ 767 length++; 768 flags = needed_flags; 769 } 770 771 if((flags & needed_flags) != needed_flags) 772 continue; 773 774 if((flags ^ needed_flags) & FLAG_KEY) 775 continue; 776 777 if(flags & FLAG_STREAM_ID) 778 length+= ff_get_v_length(pkt->stream_index); 779 780 if(pkt->size % fc->size_mul != fc->size_lsb) 781 continue; 782 if(flags & FLAG_SIZE_MSB) 783 length += ff_get_v_length(pkt->size / fc->size_mul); 784 785 if(flags & FLAG_CHECKSUM) 786 length+=4; 787 788 if(flags & FLAG_CODED_PTS) 789 length += ff_get_v_length(coded_pts); 790 791 if( (flags & FLAG_CODED) 792 && nut->header_len[best_header_idx] > nut->header_len[fc->header_idx]+1){ 793 flags |= FLAG_HEADER_IDX; 794 } 795 796 if(flags & FLAG_HEADER_IDX){ 797 length += 1 - nut->header_len[best_header_idx]; 798 }else{ 799 length -= nut->header_len[fc->header_idx]; 800 } 801 802 length*=4; 803 length+= !(flags & FLAG_CODED_PTS); 804 length+= !(flags & FLAG_CHECKSUM); 805 806 if(length < best_length){ 807 best_length= length; 808 frame_code=i; 809 } 810 } 811 assert(frame_code != -1); 812 fc= &nut->frame_code[frame_code]; 813 flags= fc->flags; 814 needed_flags= get_needed_flags(nut, nus, fc, pkt); 815 header_idx= fc->header_idx; 816 817 ffio_init_checksum(bc, ff_crc04C11DB7_update, 0); 818 avio_w8(bc, frame_code); 819 if(flags & FLAG_CODED){ 820 ff_put_v(bc, (flags^needed_flags) & ~(FLAG_CODED)); 821 flags = needed_flags; 822 } 823 if(flags & FLAG_STREAM_ID) ff_put_v(bc, pkt->stream_index); 824 if(flags & FLAG_CODED_PTS) ff_put_v(bc, coded_pts); 825 if(flags & FLAG_SIZE_MSB) ff_put_v(bc, pkt->size / fc->size_mul); 826 if(flags & FLAG_HEADER_IDX) ff_put_v(bc, header_idx= best_header_idx); 827 828 if(flags & FLAG_CHECKSUM) avio_wl32(bc, ffio_get_checksum(bc)); 829 else ffio_get_checksum(bc); 830 831 avio_write(bc, pkt->data + nut->header_len[header_idx], pkt->size - nut->header_len[header_idx]); 832 nus->last_flags= flags; 833 nus->last_pts= pkt->pts; 834 835 //FIXME just store one per syncpoint 836 if(flags & FLAG_KEY) 837 av_add_index_entry( 838 s->streams[pkt->stream_index], 839 nut->last_syncpoint_pos, 840 pkt->pts, 841 0, 842 0, 843 AVINDEX_KEYFRAME); 844 845 return 0; 846} 847 848static int nut_write_trailer(AVFormatContext *s){ 849 NUTContext *nut= s->priv_data; 850 AVIOContext *bc= s->pb; 851 852 while(nut->header_count<3) 853 write_headers(s, bc); 854 avio_flush(bc); 855 ff_nut_free_sp(nut); 856 av_freep(&nut->stream); 857 av_freep(&nut->chapter); 858 av_freep(&nut->time_base); 859 860 return 0; 861} 862 863AVOutputFormat ff_nut_muxer = { 864 .name = "nut", 865 .long_name = NULL_IF_CONFIG_SMALL("NUT format"), 866 .mime_type = "video/x-nut", 867 .extensions = "nut", 868 .priv_data_size = sizeof(NUTContext), 869#if CONFIG_LIBVORBIS 870 .audio_codec = CODEC_ID_VORBIS, 871#elif CONFIG_LIBMP3LAME 872 .audio_codec = CODEC_ID_MP3, 873#else 874 .audio_codec = CODEC_ID_MP2, 875#endif 876 .video_codec = CODEC_ID_MPEG4, 877 .write_header = nut_write_header, 878 .write_packet = nut_write_packet, 879 .write_trailer = nut_write_trailer, 880 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS, 881 .codec_tag = (const AVCodecTag * const []){ ff_codec_bmp_tags, ff_nut_video_tags, ff_codec_wav_tags, ff_nut_subtitle_tags, 0 }, 882}; 883