1/* 2 * nut muxer 3 * Copyright (c) 2004-2007 Michael Niedermayer 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 "libavutil/intreadwrite.h" 23#include "libavutil/tree.h" 24#include "libavcodec/mpegaudiodata.h" 25#include "nut.h" 26 27static int find_expected_header(AVCodecContext *c, int size, int key_frame, uint8_t out[64]){ 28 int sample_rate= c->sample_rate; 29 30 if(size>4096) 31 return 0; 32 33 AV_WB24(out, 1); 34 35 if(c->codec_id == CODEC_ID_MPEG4){ 36 if(key_frame){ 37 return 3; 38 }else{ 39 out[3]= 0xB6; 40 return 4; 41 } 42 }else if(c->codec_id == CODEC_ID_MPEG1VIDEO || c->codec_id == CODEC_ID_MPEG2VIDEO){ 43 return 3; 44 }else if(c->codec_id == CODEC_ID_H264){ 45 return 3; 46 }else if(c->codec_id == CODEC_ID_MP3 || c->codec_id == CODEC_ID_MP2){ 47 int lsf, mpeg25, sample_rate_index, bitrate_index, frame_size; 48 int layer= c->codec_id == CODEC_ID_MP3 ? 3 : 2; 49 unsigned int header= 0xFFF00000; 50 51 lsf = sample_rate < (24000+32000)/2; 52 mpeg25 = sample_rate < (12000+16000)/2; 53 sample_rate <<= lsf + mpeg25; 54 if (sample_rate < (32000 + 44100)/2) sample_rate_index=2; 55 else if(sample_rate < (44100 + 48000)/2) sample_rate_index=0; 56 else sample_rate_index=1; 57 58 sample_rate= ff_mpa_freq_tab[sample_rate_index] >> (lsf + mpeg25); 59 60 for(bitrate_index=2; bitrate_index<30; bitrate_index++){ 61 frame_size = ff_mpa_bitrate_tab[lsf][layer-1][bitrate_index>>1]; 62 frame_size = (frame_size * 144000) / (sample_rate << lsf) + (bitrate_index&1); 63 64 if(frame_size == size) 65 break; 66 } 67 68 header |= (!lsf)<<19; 69 header |= (4-layer)<<17; 70 header |= 1<<16; //no crc 71 AV_WB32(out, header); 72 if(size <= 0) 73 return 2; //we guess there is no crc, if there is one the user clearly does not care about overhead 74 if(bitrate_index == 30) 75 return -1; //something is wrong ... 76 77 header |= (bitrate_index>>1)<<12; 78 header |= sample_rate_index<<10; 79 header |= (bitrate_index&1)<<9; 80 81 return 2; //FIXME actually put the needed ones in build_elision_headers() 82 return 3; //we guess that the private bit is not set 83//FIXME the above assumptions should be checked, if these turn out false too often something should be done 84 } 85 return 0; 86} 87 88static int find_header_idx(AVFormatContext *s, AVCodecContext *c, int size, int frame_type){ 89 NUTContext *nut = s->priv_data; 90 uint8_t out[64]; 91 int i; 92 int len= find_expected_header(c, size, frame_type, out); 93 94//av_log(NULL, AV_LOG_ERROR, "expected_h len=%d size=%d codec_id=%d\n", len, size, c->codec_id); 95 96 for(i=1; i<nut->header_count; i++){ 97 if( len == nut->header_len[i] 98 && !memcmp(out, nut->header[i], len)){ 99// av_log(NULL, AV_LOG_ERROR, "found %d\n", i); 100 return i; 101 } 102 } 103// av_log(NULL, AV_LOG_ERROR, "nothing found\n"); 104 return 0; 105} 106 107static void build_elision_headers(AVFormatContext *s){ 108 NUTContext *nut = s->priv_data; 109 int i; 110 //FIXME this is lame 111 //FIXME write a 2pass mode to find the maximal headers 112 static const uint8_t headers[][5]={ 113 {3, 0x00, 0x00, 0x01}, 114 {4, 0x00, 0x00, 0x01, 0xB6}, 115 {2, 0xFF, 0xFA}, //mp3+crc 116 {2, 0xFF, 0xFB}, //mp3 117 {2, 0xFF, 0xFC}, //mp2+crc 118 {2, 0xFF, 0xFD}, //mp2 119 }; 120 121 nut->header_count= 7; 122 for(i=1; i<nut->header_count; i++){ 123 nut->header_len[i]= headers[i-1][0]; 124 nut->header [i]= &headers[i-1][1]; 125 } 126} 127 128static void build_frame_code(AVFormatContext *s){ 129 NUTContext *nut = s->priv_data; 130 int key_frame, index, pred, stream_id; 131 int start=1; 132 int end= 254; 133 int keyframe_0_esc= s->nb_streams > 2; 134 int pred_table[10]; 135 FrameCode *ft; 136 137 ft= &nut->frame_code[start]; 138 ft->flags= FLAG_CODED; 139 ft->size_mul=1; 140 ft->pts_delta=1; 141 start++; 142 143 if(keyframe_0_esc){ 144 /* keyframe = 0 escape */ 145 FrameCode *ft= &nut->frame_code[start]; 146 ft->flags= FLAG_STREAM_ID | FLAG_SIZE_MSB | FLAG_CODED_PTS; 147 ft->size_mul=1; 148 start++; 149 } 150 151 for(stream_id= 0; stream_id<s->nb_streams; stream_id++){ 152 int start2= start + (end-start)*stream_id / s->nb_streams; 153 int end2 = start + (end-start)*(stream_id+1) / s->nb_streams; 154 AVCodecContext *codec = s->streams[stream_id]->codec; 155 int is_audio= codec->codec_type == CODEC_TYPE_AUDIO; 156 int intra_only= /*codec->intra_only || */is_audio; 157 int pred_count; 158 159 for(key_frame=0; key_frame<2; key_frame++){ 160 if(intra_only && keyframe_0_esc && key_frame==0) 161 continue; 162 163 { 164 FrameCode *ft= &nut->frame_code[start2]; 165 ft->flags= FLAG_KEY*key_frame; 166 ft->flags|= FLAG_SIZE_MSB | FLAG_CODED_PTS; 167 ft->stream_id= stream_id; 168 ft->size_mul=1; 169 if(is_audio) 170 ft->header_idx= find_header_idx(s, codec, -1, key_frame); 171 start2++; 172 } 173 } 174 175 key_frame= intra_only; 176#if 1 177 if(is_audio){ 178 int frame_bytes= codec->frame_size*(int64_t)codec->bit_rate / (8*codec->sample_rate); 179 int pts; 180 for(pts=0; pts<2; pts++){ 181 for(pred=0; pred<2; pred++){ 182 FrameCode *ft= &nut->frame_code[start2]; 183 ft->flags= FLAG_KEY*key_frame; 184 ft->stream_id= stream_id; 185 ft->size_mul=frame_bytes + 2; 186 ft->size_lsb=frame_bytes + pred; 187 ft->pts_delta=pts; 188 ft->header_idx= find_header_idx(s, codec, frame_bytes + pred, key_frame); 189 start2++; 190 } 191 } 192 }else{ 193 FrameCode *ft= &nut->frame_code[start2]; 194 ft->flags= FLAG_KEY | FLAG_SIZE_MSB; 195 ft->stream_id= stream_id; 196 ft->size_mul=1; 197 ft->pts_delta=1; 198 start2++; 199 } 200#endif 201 202 if(codec->has_b_frames){ 203 pred_count=5; 204 pred_table[0]=-2; 205 pred_table[1]=-1; 206 pred_table[2]=1; 207 pred_table[3]=3; 208 pred_table[4]=4; 209 }else if(codec->codec_id == CODEC_ID_VORBIS){ 210 pred_count=3; 211 pred_table[0]=2; 212 pred_table[1]=9; 213 pred_table[2]=16; 214 }else{ 215 pred_count=1; 216 pred_table[0]=1; 217 } 218 219 for(pred=0; pred<pred_count; pred++){ 220 int start3= start2 + (end2-start2)*pred / pred_count; 221 int end3 = start2 + (end2-start2)*(pred+1) / pred_count; 222 223 for(index=start3; index<end3; index++){ 224 FrameCode *ft= &nut->frame_code[index]; 225 ft->flags= FLAG_KEY*key_frame; 226 ft->flags|= FLAG_SIZE_MSB; 227 ft->stream_id= stream_id; 228//FIXME use single byte size and pred from last 229 ft->size_mul= end3-start3; 230 ft->size_lsb= index - start3; 231 ft->pts_delta= pred_table[pred]; 232 if(is_audio) 233 ft->header_idx= find_header_idx(s, codec, -1, key_frame); 234 } 235 } 236 } 237 memmove(&nut->frame_code['N'+1], &nut->frame_code['N'], sizeof(FrameCode)*(255-'N')); 238 nut->frame_code[ 0].flags= 239 nut->frame_code[255].flags= 240 nut->frame_code['N'].flags= FLAG_INVALID; 241} 242 243/** 244 * Gets the length in bytes which is needed to store val as v. 245 */ 246static int get_length(uint64_t val){ 247 int i=1; 248 249 while(val>>=7) 250 i++; 251 252 return i; 253} 254 255static void put_v(ByteIOContext *bc, uint64_t val){ 256 int i= get_length(val); 257 258 while(--i>0) 259 put_byte(bc, 128 | (val>>(7*i))); 260 261 put_byte(bc, val&127); 262} 263 264static void put_tt(NUTContext *nut, StreamContext *nus, ByteIOContext *bc, uint64_t val){ 265 val *= nut->time_base_count; 266 val += nus->time_base - nut->time_base; 267 put_v(bc, val); 268} 269 270/** 271 * Stores a string as vb. 272 */ 273static void put_str(ByteIOContext *bc, const char *string){ 274 int len= strlen(string); 275 276 put_v(bc, len); 277 put_buffer(bc, string, len); 278} 279 280static void put_s(ByteIOContext *bc, int64_t val){ 281 put_v(bc, 2*FFABS(val) - (val>0)); 282} 283 284#ifdef TRACE 285static inline void put_v_trace(ByteIOContext *bc, uint64_t v, char *file, char *func, int line){ 286 av_log(NULL, AV_LOG_DEBUG, "put_v %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line); 287 288 put_v(bc, v); 289} 290 291static inline void put_s_trace(ByteIOContext *bc, int64_t v, char *file, char *func, int line){ 292 av_log(NULL, AV_LOG_DEBUG, "put_s %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line); 293 294 put_s(bc, v); 295} 296#define put_v(bc, v) put_v_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__) 297#define put_s(bc, v) put_s_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__) 298#endif 299 300//FIXME remove calculate_checksum 301static void put_packet(NUTContext *nut, ByteIOContext *bc, ByteIOContext *dyn_bc, int calculate_checksum, uint64_t startcode){ 302 uint8_t *dyn_buf=NULL; 303 int dyn_size= url_close_dyn_buf(dyn_bc, &dyn_buf); 304 int forw_ptr= dyn_size + 4*calculate_checksum; 305 306 if(forw_ptr > 4096) 307 init_checksum(bc, ff_crc04C11DB7_update, 0); 308 put_be64(bc, startcode); 309 put_v(bc, forw_ptr); 310 if(forw_ptr > 4096) 311 put_le32(bc, get_checksum(bc)); 312 313 if(calculate_checksum) 314 init_checksum(bc, ff_crc04C11DB7_update, 0); 315 put_buffer(bc, dyn_buf, dyn_size); 316 if(calculate_checksum) 317 put_le32(bc, get_checksum(bc)); 318 319 av_free(dyn_buf); 320} 321 322static void write_mainheader(NUTContext *nut, ByteIOContext *bc){ 323 int i, j, tmp_pts, tmp_flags, tmp_stream, tmp_mul, tmp_size, tmp_fields, tmp_head_idx; 324 int64_t tmp_match; 325 326 put_v(bc, 3); /* version */ 327 put_v(bc, nut->avf->nb_streams); 328 put_v(bc, nut->max_distance); 329 put_v(bc, nut->time_base_count); 330 331 for(i=0; i<nut->time_base_count; i++){ 332 put_v(bc, nut->time_base[i].num); 333 put_v(bc, nut->time_base[i].den); 334 } 335 336 tmp_pts=0; 337 tmp_mul=1; 338 tmp_stream=0; 339 tmp_match= 1-(1LL<<62); 340 tmp_head_idx= 0; 341 for(i=0; i<256;){ 342 tmp_fields=0; 343 tmp_size=0; 344// tmp_res=0; 345 if(tmp_pts != nut->frame_code[i].pts_delta) tmp_fields=1; 346 if(tmp_mul != nut->frame_code[i].size_mul ) tmp_fields=2; 347 if(tmp_stream != nut->frame_code[i].stream_id) tmp_fields=3; 348 if(tmp_size != nut->frame_code[i].size_lsb ) tmp_fields=4; 349// if(tmp_res != nut->frame_code[i].res ) tmp_fields=5; 350 if(tmp_head_idx!=nut->frame_code[i].header_idx)tmp_fields=8; 351 352 tmp_pts = nut->frame_code[i].pts_delta; 353 tmp_flags = nut->frame_code[i].flags; 354 tmp_stream= nut->frame_code[i].stream_id; 355 tmp_mul = nut->frame_code[i].size_mul; 356 tmp_size = nut->frame_code[i].size_lsb; 357// tmp_res = nut->frame_code[i].res; 358 tmp_head_idx= nut->frame_code[i].header_idx; 359 360 for(j=0; i<256; j++,i++){ 361 if(i == 'N'){ 362 j--; 363 continue; 364 } 365 if(nut->frame_code[i].pts_delta != tmp_pts ) break; 366 if(nut->frame_code[i].flags != tmp_flags ) break; 367 if(nut->frame_code[i].stream_id != tmp_stream) break; 368 if(nut->frame_code[i].size_mul != tmp_mul ) break; 369 if(nut->frame_code[i].size_lsb != tmp_size+j) break; 370// if(nut->frame_code[i].res != tmp_res ) break; 371 if(nut->frame_code[i].header_idx!= tmp_head_idx) break; 372 } 373 if(j != tmp_mul - tmp_size) tmp_fields=6; 374 375 put_v(bc, tmp_flags); 376 put_v(bc, tmp_fields); 377 if(tmp_fields>0) put_s(bc, tmp_pts); 378 if(tmp_fields>1) put_v(bc, tmp_mul); 379 if(tmp_fields>2) put_v(bc, tmp_stream); 380 if(tmp_fields>3) put_v(bc, tmp_size); 381 if(tmp_fields>4) put_v(bc, 0 /*tmp_res*/); 382 if(tmp_fields>5) put_v(bc, j); 383 if(tmp_fields>6) put_v(bc, tmp_match); 384 if(tmp_fields>7) put_v(bc, tmp_head_idx); 385 } 386 put_v(bc, nut->header_count-1); 387 for(i=1; i<nut->header_count; i++){ 388 put_v(bc, nut->header_len[i]); 389 put_buffer(bc, nut->header[i], nut->header_len[i]); 390 } 391} 392 393static int write_streamheader(NUTContext *nut, ByteIOContext *bc, AVStream *st, int i){ 394 AVCodecContext *codec = st->codec; 395 put_v(bc, i); 396 switch(codec->codec_type){ 397 case CODEC_TYPE_VIDEO: put_v(bc, 0); break; 398 case CODEC_TYPE_AUDIO: put_v(bc, 1); break; 399 case CODEC_TYPE_SUBTITLE: put_v(bc, 2); break; 400 default : put_v(bc, 3); break; 401 } 402 put_v(bc, 4); 403 if (codec->codec_tag){ 404 put_le32(bc, codec->codec_tag); 405 }else 406 return -1; 407 408 put_v(bc, nut->stream[i].time_base - nut->time_base); 409 put_v(bc, nut->stream[i].msb_pts_shift); 410 put_v(bc, nut->stream[i].max_pts_distance); 411 put_v(bc, codec->has_b_frames); 412 put_byte(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */ 413 414 put_v(bc, codec->extradata_size); 415 put_buffer(bc, codec->extradata, codec->extradata_size); 416 417 switch(codec->codec_type){ 418 case CODEC_TYPE_AUDIO: 419 put_v(bc, codec->sample_rate); 420 put_v(bc, 1); 421 put_v(bc, codec->channels); 422 break; 423 case CODEC_TYPE_VIDEO: 424 put_v(bc, codec->width); 425 put_v(bc, codec->height); 426 427 if(st->sample_aspect_ratio.num<=0 || st->sample_aspect_ratio.den<=0){ 428 put_v(bc, 0); 429 put_v(bc, 0); 430 }else{ 431 put_v(bc, st->sample_aspect_ratio.num); 432 put_v(bc, st->sample_aspect_ratio.den); 433 } 434 put_v(bc, 0); /* csp type -- unknown */ 435 break; 436 default: 437 break; 438 } 439 return 0; 440} 441 442static int add_info(ByteIOContext *bc, const char *type, const char *value){ 443 put_str(bc, type); 444 put_s(bc, -1); 445 put_str(bc, value); 446 return 1; 447} 448 449static int write_globalinfo(NUTContext *nut, ByteIOContext *bc){ 450 AVFormatContext *s= nut->avf; 451 AVMetadataTag *title, *author, *copyright; 452 ByteIOContext *dyn_bc; 453 uint8_t *dyn_buf=NULL; 454 int count=0, dyn_size; 455 int ret = url_open_dyn_buf(&dyn_bc); 456 if(ret < 0) 457 return ret; 458 459 title = av_metadata_get(s->metadata, "Title" , NULL, 0); 460 author = av_metadata_get(s->metadata, "Author" , NULL, 0); 461 copyright = av_metadata_get(s->metadata, "Copyright", NULL, 0); 462 463 if(title ) count+= add_info(dyn_bc, "Title" , title->value); 464 if(author ) count+= add_info(dyn_bc, "Author" , author->value); 465 if(copyright) count+= add_info(dyn_bc, "Copyright", copyright->value); 466 if(!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) 467 count+= add_info(dyn_bc, "Encoder" , LIBAVFORMAT_IDENT); 468 469 put_v(bc, 0); //stream_if_plus1 470 put_v(bc, 0); //chapter_id 471 put_v(bc, 0); //timestamp_start 472 put_v(bc, 0); //length 473 474 put_v(bc, count); 475 476 dyn_size= url_close_dyn_buf(dyn_bc, &dyn_buf); 477 put_buffer(bc, dyn_buf, dyn_size); 478 av_free(dyn_buf); 479 return 0; 480} 481 482static int write_streaminfo(NUTContext *nut, ByteIOContext *bc, int stream_id){ 483 AVFormatContext *s= nut->avf; 484 AVStream* st = s->streams[stream_id]; 485 ByteIOContext *dyn_bc; 486 uint8_t *dyn_buf=NULL; 487 int count=0, dyn_size, i; 488 int ret = url_open_dyn_buf(&dyn_bc); 489 if(ret < 0) 490 return ret; 491 492 for (i=0; ff_nut_dispositions[i].flag; ++i) { 493 if (st->disposition & ff_nut_dispositions[i].flag) 494 count += add_info(dyn_bc, "Disposition", ff_nut_dispositions[i].str); 495 } 496 dyn_size = url_close_dyn_buf(dyn_bc, &dyn_buf); 497 498 if (count) { 499 put_v(bc, stream_id + 1); //stream_id_plus1 500 put_v(bc, 0); //chapter_id 501 put_v(bc, 0); //timestamp_start 502 put_v(bc, 0); //length 503 504 put_v(bc, count); 505 506 put_buffer(bc, dyn_buf, dyn_size); 507 } 508 509 av_free(dyn_buf); 510 return count; 511} 512 513static int write_headers(NUTContext *nut, ByteIOContext *bc){ 514 ByteIOContext *dyn_bc; 515 int i, ret; 516 517 ret = url_open_dyn_buf(&dyn_bc); 518 if(ret < 0) 519 return ret; 520 write_mainheader(nut, dyn_bc); 521 put_packet(nut, bc, dyn_bc, 1, MAIN_STARTCODE); 522 523 for (i=0; i < nut->avf->nb_streams; i++){ 524 ret = url_open_dyn_buf(&dyn_bc); 525 if(ret < 0) 526 return ret; 527 write_streamheader(nut, dyn_bc, nut->avf->streams[i], i); 528 put_packet(nut, bc, dyn_bc, 1, STREAM_STARTCODE); 529 } 530 531 ret = url_open_dyn_buf(&dyn_bc); 532 if(ret < 0) 533 return ret; 534 write_globalinfo(nut, dyn_bc); 535 put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE); 536 537 for (i = 0; i < nut->avf->nb_streams; i++) { 538 ret = url_open_dyn_buf(&dyn_bc); 539 if(ret < 0) 540 return ret; 541 ret = write_streaminfo(nut, dyn_bc, i); 542 if (ret < 0) 543 return ret; 544 if (ret > 0) 545 put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE); 546 else { 547 uint8_t* buf; 548 url_close_dyn_buf(dyn_bc, &buf); 549 av_free(buf); 550 } 551 } 552 553 nut->last_syncpoint_pos= INT_MIN; 554 nut->header_count++; 555 return 0; 556} 557 558static int write_header(AVFormatContext *s){ 559 NUTContext *nut = s->priv_data; 560 ByteIOContext *bc = s->pb; 561 int i, j; 562 563 nut->avf= s; 564 565 nut->stream = av_mallocz(sizeof(StreamContext)*s->nb_streams); 566 nut->time_base= av_mallocz(sizeof(AVRational )*s->nb_streams); 567 568 for(i=0; i<s->nb_streams; i++){ 569 AVStream *st= s->streams[i]; 570 int ssize; 571 AVRational time_base; 572 ff_parse_specific_params(st->codec, &time_base.den, &ssize, &time_base.num); 573 574 av_set_pts_info(st, 64, time_base.num, time_base.den); 575 576 for(j=0; j<nut->time_base_count; j++){ 577 if(!memcmp(&time_base, &nut->time_base[j], sizeof(AVRational))){ 578 break; 579 } 580 } 581 nut->time_base[j]= time_base; 582 nut->stream[i].time_base= &nut->time_base[j]; 583 if(j==nut->time_base_count) 584 nut->time_base_count++; 585 586 if(av_q2d(time_base) >= 0.001) 587 nut->stream[i].msb_pts_shift = 7; 588 else 589 nut->stream[i].msb_pts_shift = 14; 590 nut->stream[i].max_pts_distance= FFMAX(1/av_q2d(time_base), 1); 591 } 592 593 nut->max_distance = MAX_DISTANCE; 594 build_elision_headers(s); 595 build_frame_code(s); 596 assert(nut->frame_code['N'].flags == FLAG_INVALID); 597 598 put_buffer(bc, ID_STRING, strlen(ID_STRING)); 599 put_byte(bc, 0); 600 601 write_headers(nut, bc); 602 603 put_flush_packet(bc); 604 605 //FIXME index 606 607 return 0; 608} 609 610static int get_needed_flags(NUTContext *nut, StreamContext *nus, FrameCode *fc, AVPacket *pkt){ 611 int flags= 0; 612 613 if(pkt->flags & PKT_FLAG_KEY ) flags |= FLAG_KEY; 614 if(pkt->stream_index != fc->stream_id ) flags |= FLAG_STREAM_ID; 615 if(pkt->size / fc->size_mul ) flags |= FLAG_SIZE_MSB; 616 if(pkt->pts - nus->last_pts != fc->pts_delta) flags |= FLAG_CODED_PTS; 617 if(pkt->size > 2*nut->max_distance ) flags |= FLAG_CHECKSUM; 618 if(FFABS(pkt->pts - nus->last_pts) 619 > nus->max_pts_distance) flags |= FLAG_CHECKSUM; 620 if( pkt->size < nut->header_len[fc->header_idx] 621 || (pkt->size > 4096 && fc->header_idx) 622 || memcmp(pkt->data, nut->header[fc->header_idx], nut->header_len[fc->header_idx])) 623 flags |= FLAG_HEADER_IDX; 624 625 return flags | (fc->flags & FLAG_CODED); 626} 627 628static int find_best_header_idx(NUTContext *nut, AVPacket *pkt){ 629 int i; 630 int best_i = 0; 631 int best_len= 0; 632 633 if(pkt->size > 4096) 634 return 0; 635 636 for(i=1; i<nut->header_count; i++){ 637 if( pkt->size >= nut->header_len[i] 638 && nut->header_len[i] > best_len 639 && !memcmp(pkt->data, nut->header[i], nut->header_len[i])){ 640 best_i= i; 641 best_len= nut->header_len[i]; 642 } 643 } 644 return best_i; 645} 646 647static int write_packet(AVFormatContext *s, AVPacket *pkt){ 648 NUTContext *nut = s->priv_data; 649 StreamContext *nus= &nut->stream[pkt->stream_index]; 650 ByteIOContext *bc = s->pb, *dyn_bc; 651 FrameCode *fc; 652 int64_t coded_pts; 653 int best_length, frame_code, flags, needed_flags, i, header_idx, best_header_idx; 654 int key_frame = !!(pkt->flags & PKT_FLAG_KEY); 655 int store_sp=0; 656 int ret; 657 658 if(pkt->pts < 0) 659 return -1; 660 661 if(1LL<<(20+3*nut->header_count) <= url_ftell(bc)) 662 write_headers(nut, bc); 663 664 if(key_frame && !(nus->last_flags & FLAG_KEY)) 665 store_sp= 1; 666 667 if(pkt->size + 30/*FIXME check*/ + url_ftell(bc) >= nut->last_syncpoint_pos + nut->max_distance) 668 store_sp= 1; 669 670//FIXME: Ensure store_sp is 1 in the first place. 671 672 if(store_sp){ 673 Syncpoint *sp, dummy= {.pos= INT64_MAX}; 674 675 ff_nut_reset_ts(nut, *nus->time_base, pkt->dts); 676 for(i=0; i<s->nb_streams; i++){ 677 AVStream *st= s->streams[i]; 678 int64_t dts_tb = av_rescale_rnd(pkt->dts, 679 nus->time_base->num * (int64_t)nut->stream[i].time_base->den, 680 nus->time_base->den * (int64_t)nut->stream[i].time_base->num, 681 AV_ROUND_DOWN); 682 int index= av_index_search_timestamp(st, dts_tb, AVSEEK_FLAG_BACKWARD); 683 if(index>=0) dummy.pos= FFMIN(dummy.pos, st->index_entries[index].pos); 684 } 685 if(dummy.pos == INT64_MAX) 686 dummy.pos= 0; 687 sp= av_tree_find(nut->syncpoints, &dummy, ff_nut_sp_pos_cmp, NULL); 688 689 nut->last_syncpoint_pos= url_ftell(bc); 690 ret = url_open_dyn_buf(&dyn_bc); 691 if(ret < 0) 692 return ret; 693 put_tt(nut, nus, dyn_bc, pkt->dts); 694 put_v(dyn_bc, sp ? (nut->last_syncpoint_pos - sp->pos)>>4 : 0); 695 put_packet(nut, bc, dyn_bc, 1, SYNCPOINT_STARTCODE); 696 697 ff_nut_add_sp(nut, nut->last_syncpoint_pos, 0/*unused*/, pkt->dts); 698 } 699 assert(nus->last_pts != AV_NOPTS_VALUE); 700 701 coded_pts = pkt->pts & ((1<<nus->msb_pts_shift)-1); 702 if(ff_lsb2full(nus, coded_pts) != pkt->pts) 703 coded_pts= pkt->pts + (1<<nus->msb_pts_shift); 704 705 best_header_idx= find_best_header_idx(nut, pkt); 706 707 best_length=INT_MAX; 708 frame_code= -1; 709 for(i=0; i<256; i++){ 710 int length= 0; 711 FrameCode *fc= &nut->frame_code[i]; 712 int flags= fc->flags; 713 714 if(flags & FLAG_INVALID) 715 continue; 716 needed_flags= get_needed_flags(nut, nus, fc, pkt); 717 718 if(flags & FLAG_CODED){ 719 length++; 720 flags = needed_flags; 721 } 722 723 if((flags & needed_flags) != needed_flags) 724 continue; 725 726 if((flags ^ needed_flags) & FLAG_KEY) 727 continue; 728 729 if(flags & FLAG_STREAM_ID) 730 length+= get_length(pkt->stream_index); 731 732 if(pkt->size % fc->size_mul != fc->size_lsb) 733 continue; 734 if(flags & FLAG_SIZE_MSB) 735 length += get_length(pkt->size / fc->size_mul); 736 737 if(flags & FLAG_CHECKSUM) 738 length+=4; 739 740 if(flags & FLAG_CODED_PTS) 741 length += get_length(coded_pts); 742 743 if( (flags & FLAG_CODED) 744 && nut->header_len[best_header_idx] > nut->header_len[fc->header_idx]+1){ 745 flags |= FLAG_HEADER_IDX; 746 } 747 748 if(flags & FLAG_HEADER_IDX){ 749 length += 1 - nut->header_len[best_header_idx]; 750 }else{ 751 length -= nut->header_len[fc->header_idx]; 752 } 753 754 length*=4; 755 length+= !(flags & FLAG_CODED_PTS); 756 length+= !(flags & FLAG_CHECKSUM); 757 758 if(length < best_length){ 759 best_length= length; 760 frame_code=i; 761 } 762 } 763 assert(frame_code != -1); 764 fc= &nut->frame_code[frame_code]; 765 flags= fc->flags; 766 needed_flags= get_needed_flags(nut, nus, fc, pkt); 767 header_idx= fc->header_idx; 768 769 init_checksum(bc, ff_crc04C11DB7_update, 0); 770 put_byte(bc, frame_code); 771 if(flags & FLAG_CODED){ 772 put_v(bc, (flags^needed_flags) & ~(FLAG_CODED)); 773 flags = needed_flags; 774 } 775 if(flags & FLAG_STREAM_ID) put_v(bc, pkt->stream_index); 776 if(flags & FLAG_CODED_PTS) put_v(bc, coded_pts); 777 if(flags & FLAG_SIZE_MSB) put_v(bc, pkt->size / fc->size_mul); 778 if(flags & FLAG_HEADER_IDX) put_v(bc, header_idx= best_header_idx); 779 780 if(flags & FLAG_CHECKSUM) put_le32(bc, get_checksum(bc)); 781 else get_checksum(bc); 782 783 put_buffer(bc, pkt->data + nut->header_len[header_idx], pkt->size - nut->header_len[header_idx]); 784 nus->last_flags= flags; 785 nus->last_pts= pkt->pts; 786 787 //FIXME just store one per syncpoint 788 if(flags & FLAG_KEY) 789 av_add_index_entry( 790 s->streams[pkt->stream_index], 791 nut->last_syncpoint_pos, 792 pkt->pts, 793 0, 794 0, 795 AVINDEX_KEYFRAME); 796 797 return 0; 798} 799 800static int write_trailer(AVFormatContext *s){ 801 NUTContext *nut= s->priv_data; 802 ByteIOContext *bc= s->pb; 803 804 while(nut->header_count<3) 805 write_headers(nut, bc); 806 put_flush_packet(bc); 807 808 return 0; 809} 810 811AVOutputFormat nut_muxer = { 812 "nut", 813 NULL_IF_CONFIG_SMALL("NUT format"), 814 "video/x-nut", 815 "nut", 816 sizeof(NUTContext), 817#if CONFIG_LIBVORBIS 818 CODEC_ID_VORBIS, 819#elif CONFIG_LIBMP3LAME 820 CODEC_ID_MP3, 821#else 822 CODEC_ID_MP2, 823#endif 824 CODEC_ID_MPEG4, 825 write_header, 826 write_packet, 827 write_trailer, 828 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS, 829 .codec_tag= (const AVCodecTag* const []){codec_bmp_tags, codec_wav_tags, ff_nut_subtitle_tags, 0}, 830}; 831