Libav 0.7.1
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00001 /* 00002 * nut muxer 00003 * Copyright (c) 2004-2007 Michael Niedermayer 00004 * 00005 * This file is part of Libav. 00006 * 00007 * Libav is free software; you can redistribute it and/or 00008 * modify it under the terms of the GNU Lesser General Public 00009 * License as published by the Free Software Foundation; either 00010 * version 2.1 of the License, or (at your option) any later version. 00011 * 00012 * Libav is distributed in the hope that it will be useful, 00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00015 * Lesser General Public License for more details. 00016 * 00017 * You should have received a copy of the GNU Lesser General Public 00018 * License along with Libav; if not, write to the Free Software 00019 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00020 */ 00021 00022 #include "libavutil/intreadwrite.h" 00023 #include "libavutil/tree.h" 00024 #include "libavutil/dict.h" 00025 #include "libavcodec/mpegaudiodata.h" 00026 #include "nut.h" 00027 #include "internal.h" 00028 #include "avio_internal.h" 00029 00030 static int find_expected_header(AVCodecContext *c, int size, int key_frame, uint8_t out[64]){ 00031 int sample_rate= c->sample_rate; 00032 00033 if(size>4096) 00034 return 0; 00035 00036 AV_WB24(out, 1); 00037 00038 if(c->codec_id == CODEC_ID_MPEG4){ 00039 if(key_frame){ 00040 return 3; 00041 }else{ 00042 out[3]= 0xB6; 00043 return 4; 00044 } 00045 }else if(c->codec_id == CODEC_ID_MPEG1VIDEO || c->codec_id == CODEC_ID_MPEG2VIDEO){ 00046 return 3; 00047 }else if(c->codec_id == CODEC_ID_H264){ 00048 return 3; 00049 }else if(c->codec_id == CODEC_ID_MP3 || c->codec_id == CODEC_ID_MP2){ 00050 int lsf, mpeg25, sample_rate_index, bitrate_index, frame_size; 00051 int layer= c->codec_id == CODEC_ID_MP3 ? 3 : 2; 00052 unsigned int header= 0xFFF00000; 00053 00054 lsf = sample_rate < (24000+32000)/2; 00055 mpeg25 = sample_rate < (12000+16000)/2; 00056 sample_rate <<= lsf + mpeg25; 00057 if (sample_rate < (32000 + 44100)/2) sample_rate_index=2; 00058 else if(sample_rate < (44100 + 48000)/2) sample_rate_index=0; 00059 else sample_rate_index=1; 00060 00061 sample_rate= ff_mpa_freq_tab[sample_rate_index] >> (lsf + mpeg25); 00062 00063 for(bitrate_index=2; bitrate_index<30; bitrate_index++){ 00064 frame_size = ff_mpa_bitrate_tab[lsf][layer-1][bitrate_index>>1]; 00065 frame_size = (frame_size * 144000) / (sample_rate << lsf) + (bitrate_index&1); 00066 00067 if(frame_size == size) 00068 break; 00069 } 00070 00071 header |= (!lsf)<<19; 00072 header |= (4-layer)<<17; 00073 header |= 1<<16; //no crc 00074 AV_WB32(out, header); 00075 if(size <= 0) 00076 return 2; //we guess there is no crc, if there is one the user clearly does not care about overhead 00077 if(bitrate_index == 30) 00078 return -1; //something is wrong ... 00079 00080 header |= (bitrate_index>>1)<<12; 00081 header |= sample_rate_index<<10; 00082 header |= (bitrate_index&1)<<9; 00083 00084 return 2; //FIXME actually put the needed ones in build_elision_headers() 00085 return 3; //we guess that the private bit is not set 00086 //FIXME the above assumptions should be checked, if these turn out false too often something should be done 00087 } 00088 return 0; 00089 } 00090 00091 static int find_header_idx(AVFormatContext *s, AVCodecContext *c, int size, int frame_type){ 00092 NUTContext *nut = s->priv_data; 00093 uint8_t out[64]; 00094 int i; 00095 int len= find_expected_header(c, size, frame_type, out); 00096 00097 //av_log(NULL, AV_LOG_ERROR, "expected_h len=%d size=%d codec_id=%d\n", len, size, c->codec_id); 00098 00099 for(i=1; i<nut->header_count; i++){ 00100 if( len == nut->header_len[i] 00101 && !memcmp(out, nut->header[i], len)){ 00102 // av_log(NULL, AV_LOG_ERROR, "found %d\n", i); 00103 return i; 00104 } 00105 } 00106 // av_log(NULL, AV_LOG_ERROR, "nothing found\n"); 00107 return 0; 00108 } 00109 00110 static void build_elision_headers(AVFormatContext *s){ 00111 NUTContext *nut = s->priv_data; 00112 int i; 00113 //FIXME this is lame 00114 //FIXME write a 2pass mode to find the maximal headers 00115 static const uint8_t headers[][5]={ 00116 {3, 0x00, 0x00, 0x01}, 00117 {4, 0x00, 0x00, 0x01, 0xB6}, 00118 {2, 0xFF, 0xFA}, //mp3+crc 00119 {2, 0xFF, 0xFB}, //mp3 00120 {2, 0xFF, 0xFC}, //mp2+crc 00121 {2, 0xFF, 0xFD}, //mp2 00122 }; 00123 00124 nut->header_count= 7; 00125 for(i=1; i<nut->header_count; i++){ 00126 nut->header_len[i]= headers[i-1][0]; 00127 nut->header [i]= &headers[i-1][1]; 00128 } 00129 } 00130 00131 static void build_frame_code(AVFormatContext *s){ 00132 NUTContext *nut = s->priv_data; 00133 int key_frame, index, pred, stream_id; 00134 int start=1; 00135 int end= 254; 00136 int keyframe_0_esc= s->nb_streams > 2; 00137 int pred_table[10]; 00138 FrameCode *ft; 00139 00140 ft= &nut->frame_code[start]; 00141 ft->flags= FLAG_CODED; 00142 ft->size_mul=1; 00143 ft->pts_delta=1; 00144 start++; 00145 00146 if(keyframe_0_esc){ 00147 /* keyframe = 0 escape */ 00148 FrameCode *ft= &nut->frame_code[start]; 00149 ft->flags= FLAG_STREAM_ID | FLAG_SIZE_MSB | FLAG_CODED_PTS; 00150 ft->size_mul=1; 00151 start++; 00152 } 00153 00154 for(stream_id= 0; stream_id<s->nb_streams; stream_id++){ 00155 int start2= start + (end-start)*stream_id / s->nb_streams; 00156 int end2 = start + (end-start)*(stream_id+1) / s->nb_streams; 00157 AVCodecContext *codec = s->streams[stream_id]->codec; 00158 int is_audio= codec->codec_type == AVMEDIA_TYPE_AUDIO; 00159 int intra_only= /*codec->intra_only || */is_audio; 00160 int pred_count; 00161 00162 for(key_frame=0; key_frame<2; key_frame++){ 00163 if(intra_only && keyframe_0_esc && key_frame==0) 00164 continue; 00165 00166 { 00167 FrameCode *ft= &nut->frame_code[start2]; 00168 ft->flags= FLAG_KEY*key_frame; 00169 ft->flags|= FLAG_SIZE_MSB | FLAG_CODED_PTS; 00170 ft->stream_id= stream_id; 00171 ft->size_mul=1; 00172 if(is_audio) 00173 ft->header_idx= find_header_idx(s, codec, -1, key_frame); 00174 start2++; 00175 } 00176 } 00177 00178 key_frame= intra_only; 00179 if(is_audio){ 00180 int frame_bytes= codec->frame_size*(int64_t)codec->bit_rate / (8*codec->sample_rate); 00181 int pts; 00182 for(pts=0; pts<2; pts++){ 00183 for(pred=0; pred<2; pred++){ 00184 FrameCode *ft= &nut->frame_code[start2]; 00185 ft->flags= FLAG_KEY*key_frame; 00186 ft->stream_id= stream_id; 00187 ft->size_mul=frame_bytes + 2; 00188 ft->size_lsb=frame_bytes + pred; 00189 ft->pts_delta=pts; 00190 ft->header_idx= find_header_idx(s, codec, frame_bytes + pred, key_frame); 00191 start2++; 00192 } 00193 } 00194 }else{ 00195 FrameCode *ft= &nut->frame_code[start2]; 00196 ft->flags= FLAG_KEY | FLAG_SIZE_MSB; 00197 ft->stream_id= stream_id; 00198 ft->size_mul=1; 00199 ft->pts_delta=1; 00200 start2++; 00201 } 00202 00203 if(codec->has_b_frames){ 00204 pred_count=5; 00205 pred_table[0]=-2; 00206 pred_table[1]=-1; 00207 pred_table[2]=1; 00208 pred_table[3]=3; 00209 pred_table[4]=4; 00210 }else if(codec->codec_id == CODEC_ID_VORBIS){ 00211 pred_count=3; 00212 pred_table[0]=2; 00213 pred_table[1]=9; 00214 pred_table[2]=16; 00215 }else{ 00216 pred_count=1; 00217 pred_table[0]=1; 00218 } 00219 00220 for(pred=0; pred<pred_count; pred++){ 00221 int start3= start2 + (end2-start2)*pred / pred_count; 00222 int end3 = start2 + (end2-start2)*(pred+1) / pred_count; 00223 00224 for(index=start3; index<end3; index++){ 00225 FrameCode *ft= &nut->frame_code[index]; 00226 ft->flags= FLAG_KEY*key_frame; 00227 ft->flags|= FLAG_SIZE_MSB; 00228 ft->stream_id= stream_id; 00229 //FIXME use single byte size and pred from last 00230 ft->size_mul= end3-start3; 00231 ft->size_lsb= index - start3; 00232 ft->pts_delta= pred_table[pred]; 00233 if(is_audio) 00234 ft->header_idx= find_header_idx(s, codec, -1, key_frame); 00235 } 00236 } 00237 } 00238 memmove(&nut->frame_code['N'+1], &nut->frame_code['N'], sizeof(FrameCode)*(255-'N')); 00239 nut->frame_code[ 0].flags= 00240 nut->frame_code[255].flags= 00241 nut->frame_code['N'].flags= FLAG_INVALID; 00242 } 00243 00244 static void put_tt(NUTContext *nut, AVRational *time_base, AVIOContext *bc, uint64_t val){ 00245 val *= nut->time_base_count; 00246 val += time_base - nut->time_base; 00247 ff_put_v(bc, val); 00248 } 00249 00253 static void put_str(AVIOContext *bc, const char *string){ 00254 int len= strlen(string); 00255 00256 ff_put_v(bc, len); 00257 avio_write(bc, string, len); 00258 } 00259 00260 static void put_s(AVIOContext *bc, int64_t val){ 00261 ff_put_v(bc, 2*FFABS(val) - (val>0)); 00262 } 00263 00264 #ifdef TRACE 00265 static inline void ff_put_v_trace(AVIOContext *bc, uint64_t v, char *file, char *func, int line){ 00266 av_log(NULL, AV_LOG_DEBUG, "ff_put_v %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line); 00267 00268 ff_put_v(bc, v); 00269 } 00270 00271 static inline void put_s_trace(AVIOContext *bc, int64_t v, char *file, char *func, int line){ 00272 av_log(NULL, AV_LOG_DEBUG, "put_s %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line); 00273 00274 put_s(bc, v); 00275 } 00276 #define ff_put_v(bc, v) ff_put_v_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__) 00277 #define put_s(bc, v) put_s_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__) 00278 #endif 00279 00280 //FIXME remove calculate_checksum 00281 static void put_packet(NUTContext *nut, AVIOContext *bc, AVIOContext *dyn_bc, int calculate_checksum, uint64_t startcode){ 00282 uint8_t *dyn_buf=NULL; 00283 int dyn_size= avio_close_dyn_buf(dyn_bc, &dyn_buf); 00284 int forw_ptr= dyn_size + 4*calculate_checksum; 00285 00286 if(forw_ptr > 4096) 00287 ffio_init_checksum(bc, ff_crc04C11DB7_update, 0); 00288 avio_wb64(bc, startcode); 00289 ff_put_v(bc, forw_ptr); 00290 if(forw_ptr > 4096) 00291 avio_wl32(bc, ffio_get_checksum(bc)); 00292 00293 if(calculate_checksum) 00294 ffio_init_checksum(bc, ff_crc04C11DB7_update, 0); 00295 avio_write(bc, dyn_buf, dyn_size); 00296 if(calculate_checksum) 00297 avio_wl32(bc, ffio_get_checksum(bc)); 00298 00299 av_free(dyn_buf); 00300 } 00301 00302 static void write_mainheader(NUTContext *nut, AVIOContext *bc){ 00303 int i, j, tmp_pts, tmp_flags, tmp_stream, tmp_mul, tmp_size, tmp_fields, tmp_head_idx; 00304 int64_t tmp_match; 00305 00306 ff_put_v(bc, 3); /* version */ 00307 ff_put_v(bc, nut->avf->nb_streams); 00308 ff_put_v(bc, nut->max_distance); 00309 ff_put_v(bc, nut->time_base_count); 00310 00311 for(i=0; i<nut->time_base_count; i++){ 00312 ff_put_v(bc, nut->time_base[i].num); 00313 ff_put_v(bc, nut->time_base[i].den); 00314 } 00315 00316 tmp_pts=0; 00317 tmp_mul=1; 00318 tmp_stream=0; 00319 tmp_match= 1-(1LL<<62); 00320 tmp_head_idx= 0; 00321 for(i=0; i<256;){ 00322 tmp_fields=0; 00323 tmp_size=0; 00324 // tmp_res=0; 00325 if(tmp_pts != nut->frame_code[i].pts_delta) tmp_fields=1; 00326 if(tmp_mul != nut->frame_code[i].size_mul ) tmp_fields=2; 00327 if(tmp_stream != nut->frame_code[i].stream_id) tmp_fields=3; 00328 if(tmp_size != nut->frame_code[i].size_lsb ) tmp_fields=4; 00329 // if(tmp_res != nut->frame_code[i].res ) tmp_fields=5; 00330 if(tmp_head_idx!=nut->frame_code[i].header_idx)tmp_fields=8; 00331 00332 tmp_pts = nut->frame_code[i].pts_delta; 00333 tmp_flags = nut->frame_code[i].flags; 00334 tmp_stream= nut->frame_code[i].stream_id; 00335 tmp_mul = nut->frame_code[i].size_mul; 00336 tmp_size = nut->frame_code[i].size_lsb; 00337 // tmp_res = nut->frame_code[i].res; 00338 tmp_head_idx= nut->frame_code[i].header_idx; 00339 00340 for(j=0; i<256; j++,i++){ 00341 if(i == 'N'){ 00342 j--; 00343 continue; 00344 } 00345 if(nut->frame_code[i].pts_delta != tmp_pts ) break; 00346 if(nut->frame_code[i].flags != tmp_flags ) break; 00347 if(nut->frame_code[i].stream_id != tmp_stream) break; 00348 if(nut->frame_code[i].size_mul != tmp_mul ) break; 00349 if(nut->frame_code[i].size_lsb != tmp_size+j) break; 00350 // if(nut->frame_code[i].res != tmp_res ) break; 00351 if(nut->frame_code[i].header_idx!= tmp_head_idx) break; 00352 } 00353 if(j != tmp_mul - tmp_size) tmp_fields=6; 00354 00355 ff_put_v(bc, tmp_flags); 00356 ff_put_v(bc, tmp_fields); 00357 if(tmp_fields>0) put_s(bc, tmp_pts); 00358 if(tmp_fields>1) ff_put_v(bc, tmp_mul); 00359 if(tmp_fields>2) ff_put_v(bc, tmp_stream); 00360 if(tmp_fields>3) ff_put_v(bc, tmp_size); 00361 if(tmp_fields>4) ff_put_v(bc, 0 /*tmp_res*/); 00362 if(tmp_fields>5) ff_put_v(bc, j); 00363 if(tmp_fields>6) ff_put_v(bc, tmp_match); 00364 if(tmp_fields>7) ff_put_v(bc, tmp_head_idx); 00365 } 00366 ff_put_v(bc, nut->header_count-1); 00367 for(i=1; i<nut->header_count; i++){ 00368 ff_put_v(bc, nut->header_len[i]); 00369 avio_write(bc, nut->header[i], nut->header_len[i]); 00370 } 00371 } 00372 00373 static int write_streamheader(AVFormatContext *avctx, AVIOContext *bc, AVStream *st, int i){ 00374 NUTContext *nut = avctx->priv_data; 00375 AVCodecContext *codec = st->codec; 00376 ff_put_v(bc, i); 00377 switch(codec->codec_type){ 00378 case AVMEDIA_TYPE_VIDEO: ff_put_v(bc, 0); break; 00379 case AVMEDIA_TYPE_AUDIO: ff_put_v(bc, 1); break; 00380 case AVMEDIA_TYPE_SUBTITLE: ff_put_v(bc, 2); break; 00381 default : ff_put_v(bc, 3); break; 00382 } 00383 ff_put_v(bc, 4); 00384 if (codec->codec_tag){ 00385 avio_wl32(bc, codec->codec_tag); 00386 } else { 00387 av_log(avctx, AV_LOG_ERROR, "No codec tag defined for stream %d\n", i); 00388 return AVERROR(EINVAL); 00389 } 00390 00391 ff_put_v(bc, nut->stream[i].time_base - nut->time_base); 00392 ff_put_v(bc, nut->stream[i].msb_pts_shift); 00393 ff_put_v(bc, nut->stream[i].max_pts_distance); 00394 ff_put_v(bc, codec->has_b_frames); 00395 avio_w8(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */ 00396 00397 ff_put_v(bc, codec->extradata_size); 00398 avio_write(bc, codec->extradata, codec->extradata_size); 00399 00400 switch(codec->codec_type){ 00401 case AVMEDIA_TYPE_AUDIO: 00402 ff_put_v(bc, codec->sample_rate); 00403 ff_put_v(bc, 1); 00404 ff_put_v(bc, codec->channels); 00405 break; 00406 case AVMEDIA_TYPE_VIDEO: 00407 ff_put_v(bc, codec->width); 00408 ff_put_v(bc, codec->height); 00409 00410 if(st->sample_aspect_ratio.num<=0 || st->sample_aspect_ratio.den<=0){ 00411 ff_put_v(bc, 0); 00412 ff_put_v(bc, 0); 00413 }else{ 00414 ff_put_v(bc, st->sample_aspect_ratio.num); 00415 ff_put_v(bc, st->sample_aspect_ratio.den); 00416 } 00417 ff_put_v(bc, 0); /* csp type -- unknown */ 00418 break; 00419 default: 00420 break; 00421 } 00422 return 0; 00423 } 00424 00425 static int add_info(AVIOContext *bc, const char *type, const char *value){ 00426 put_str(bc, type); 00427 put_s(bc, -1); 00428 put_str(bc, value); 00429 return 1; 00430 } 00431 00432 static int write_globalinfo(NUTContext *nut, AVIOContext *bc){ 00433 AVFormatContext *s= nut->avf; 00434 AVDictionaryEntry *t = NULL; 00435 AVIOContext *dyn_bc; 00436 uint8_t *dyn_buf=NULL; 00437 int count=0, dyn_size; 00438 int ret = avio_open_dyn_buf(&dyn_bc); 00439 if(ret < 0) 00440 return ret; 00441 00442 while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) 00443 count += add_info(dyn_bc, t->key, t->value); 00444 00445 ff_put_v(bc, 0); //stream_if_plus1 00446 ff_put_v(bc, 0); //chapter_id 00447 ff_put_v(bc, 0); //timestamp_start 00448 ff_put_v(bc, 0); //length 00449 00450 ff_put_v(bc, count); 00451 00452 dyn_size= avio_close_dyn_buf(dyn_bc, &dyn_buf); 00453 avio_write(bc, dyn_buf, dyn_size); 00454 av_free(dyn_buf); 00455 return 0; 00456 } 00457 00458 static int write_streaminfo(NUTContext *nut, AVIOContext *bc, int stream_id){ 00459 AVFormatContext *s= nut->avf; 00460 AVStream* st = s->streams[stream_id]; 00461 AVIOContext *dyn_bc; 00462 uint8_t *dyn_buf=NULL; 00463 int count=0, dyn_size, i; 00464 int ret = avio_open_dyn_buf(&dyn_bc); 00465 if(ret < 0) 00466 return ret; 00467 00468 for (i=0; ff_nut_dispositions[i].flag; ++i) { 00469 if (st->disposition & ff_nut_dispositions[i].flag) 00470 count += add_info(dyn_bc, "Disposition", ff_nut_dispositions[i].str); 00471 } 00472 dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf); 00473 00474 if (count) { 00475 ff_put_v(bc, stream_id + 1); //stream_id_plus1 00476 ff_put_v(bc, 0); //chapter_id 00477 ff_put_v(bc, 0); //timestamp_start 00478 ff_put_v(bc, 0); //length 00479 00480 ff_put_v(bc, count); 00481 00482 avio_write(bc, dyn_buf, dyn_size); 00483 } 00484 00485 av_free(dyn_buf); 00486 return count; 00487 } 00488 00489 static int write_chapter(NUTContext *nut, AVIOContext *bc, int id) 00490 { 00491 AVIOContext *dyn_bc; 00492 uint8_t *dyn_buf = NULL; 00493 AVDictionaryEntry *t = NULL; 00494 AVChapter *ch = nut->avf->chapters[id]; 00495 int ret, dyn_size, count = 0; 00496 00497 ret = avio_open_dyn_buf(&dyn_bc); 00498 if (ret < 0) 00499 return ret; 00500 00501 ff_put_v(bc, 0); // stream_id_plus1 00502 put_s(bc, id + 1); // chapter_id 00503 put_tt(nut, nut->chapter[id].time_base, bc, ch->start); // chapter_start 00504 ff_put_v(bc, ch->end - ch->start); // chapter_len 00505 00506 while ((t = av_dict_get(ch->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) 00507 count += add_info(dyn_bc, t->key, t->value); 00508 00509 ff_put_v(bc, count); 00510 00511 dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf); 00512 avio_write(bc, dyn_buf, dyn_size); 00513 av_freep(&dyn_buf); 00514 return 0; 00515 } 00516 00517 static int write_headers(AVFormatContext *avctx, AVIOContext *bc){ 00518 NUTContext *nut = avctx->priv_data; 00519 AVIOContext *dyn_bc; 00520 int i, ret; 00521 00522 ff_metadata_conv_ctx(avctx, ff_nut_metadata_conv, NULL); 00523 00524 ret = avio_open_dyn_buf(&dyn_bc); 00525 if(ret < 0) 00526 return ret; 00527 write_mainheader(nut, dyn_bc); 00528 put_packet(nut, bc, dyn_bc, 1, MAIN_STARTCODE); 00529 00530 for (i=0; i < nut->avf->nb_streams; i++){ 00531 ret = avio_open_dyn_buf(&dyn_bc); 00532 if(ret < 0) 00533 return ret; 00534 if ((ret = write_streamheader(avctx, dyn_bc, nut->avf->streams[i], i)) < 0) 00535 return ret; 00536 put_packet(nut, bc, dyn_bc, 1, STREAM_STARTCODE); 00537 } 00538 00539 ret = avio_open_dyn_buf(&dyn_bc); 00540 if(ret < 0) 00541 return ret; 00542 write_globalinfo(nut, dyn_bc); 00543 put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE); 00544 00545 for (i = 0; i < nut->avf->nb_streams; i++) { 00546 ret = avio_open_dyn_buf(&dyn_bc); 00547 if(ret < 0) 00548 return ret; 00549 ret = write_streaminfo(nut, dyn_bc, i); 00550 if (ret < 0) 00551 return ret; 00552 if (ret > 0) 00553 put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE); 00554 else { 00555 uint8_t* buf; 00556 avio_close_dyn_buf(dyn_bc, &buf); 00557 av_free(buf); 00558 } 00559 } 00560 00561 for (i = 0; i < nut->avf->nb_chapters; i++) { 00562 ret = avio_open_dyn_buf(&dyn_bc); 00563 if (ret < 0) 00564 return ret; 00565 ret = write_chapter(nut, dyn_bc, i); 00566 if (ret < 0) { 00567 uint8_t *buf; 00568 avio_close_dyn_buf(dyn_bc, &buf); 00569 av_freep(&buf); 00570 return ret; 00571 } 00572 put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE); 00573 } 00574 00575 nut->last_syncpoint_pos= INT_MIN; 00576 nut->header_count++; 00577 return 0; 00578 } 00579 00580 static int write_header(AVFormatContext *s){ 00581 NUTContext *nut = s->priv_data; 00582 AVIOContext *bc = s->pb; 00583 int i, j, ret; 00584 00585 nut->avf= s; 00586 00587 nut->stream = av_mallocz(sizeof(StreamContext)*s->nb_streams); 00588 if (s->nb_chapters) 00589 nut->chapter = av_mallocz(sizeof(ChapterContext)*s->nb_chapters); 00590 nut->time_base= av_mallocz(sizeof(AVRational )*(s->nb_streams + 00591 s->nb_chapters)); 00592 if (!nut->stream || (s->nb_chapters && !nut->chapter) || !nut->time_base) { 00593 av_freep(&nut->stream); 00594 av_freep(&nut->chapter); 00595 av_freep(&nut->time_base); 00596 return AVERROR(ENOMEM); 00597 } 00598 00599 for(i=0; i<s->nb_streams; i++){ 00600 AVStream *st= s->streams[i]; 00601 int ssize; 00602 AVRational time_base; 00603 ff_parse_specific_params(st->codec, &time_base.den, &ssize, &time_base.num); 00604 00605 av_set_pts_info(st, 64, time_base.num, time_base.den); 00606 00607 for(j=0; j<nut->time_base_count; j++){ 00608 if(!memcmp(&time_base, &nut->time_base[j], sizeof(AVRational))){ 00609 break; 00610 } 00611 } 00612 nut->time_base[j]= time_base; 00613 nut->stream[i].time_base= &nut->time_base[j]; 00614 if(j==nut->time_base_count) 00615 nut->time_base_count++; 00616 00617 if(INT64_C(1000) * time_base.num >= time_base.den) 00618 nut->stream[i].msb_pts_shift = 7; 00619 else 00620 nut->stream[i].msb_pts_shift = 14; 00621 nut->stream[i].max_pts_distance= FFMAX(time_base.den, time_base.num) / time_base.num; 00622 } 00623 00624 for (i = 0; i < s->nb_chapters; i++) { 00625 AVChapter *ch = s->chapters[i]; 00626 00627 for (j = 0; j < nut->time_base_count; j++) { 00628 if (!memcmp(&ch->time_base, &nut->time_base[j], sizeof(AVRational))) 00629 break; 00630 } 00631 00632 nut->time_base[j] = ch->time_base; 00633 nut->chapter[i].time_base = &nut->time_base[j]; 00634 if(j == nut->time_base_count) 00635 nut->time_base_count++; 00636 } 00637 00638 nut->max_distance = MAX_DISTANCE; 00639 build_elision_headers(s); 00640 build_frame_code(s); 00641 assert(nut->frame_code['N'].flags == FLAG_INVALID); 00642 00643 avio_write(bc, ID_STRING, strlen(ID_STRING)); 00644 avio_w8(bc, 0); 00645 00646 if ((ret = write_headers(s, bc)) < 0) 00647 return ret; 00648 00649 avio_flush(bc); 00650 00651 //FIXME index 00652 00653 return 0; 00654 } 00655 00656 static int get_needed_flags(NUTContext *nut, StreamContext *nus, FrameCode *fc, AVPacket *pkt){ 00657 int flags= 0; 00658 00659 if(pkt->flags & AV_PKT_FLAG_KEY ) flags |= FLAG_KEY; 00660 if(pkt->stream_index != fc->stream_id ) flags |= FLAG_STREAM_ID; 00661 if(pkt->size / fc->size_mul ) flags |= FLAG_SIZE_MSB; 00662 if(pkt->pts - nus->last_pts != fc->pts_delta) flags |= FLAG_CODED_PTS; 00663 if(pkt->size > 2*nut->max_distance ) flags |= FLAG_CHECKSUM; 00664 if(FFABS(pkt->pts - nus->last_pts) 00665 > nus->max_pts_distance) flags |= FLAG_CHECKSUM; 00666 if( pkt->size < nut->header_len[fc->header_idx] 00667 || (pkt->size > 4096 && fc->header_idx) 00668 || memcmp(pkt->data, nut->header[fc->header_idx], nut->header_len[fc->header_idx])) 00669 flags |= FLAG_HEADER_IDX; 00670 00671 return flags | (fc->flags & FLAG_CODED); 00672 } 00673 00674 static int find_best_header_idx(NUTContext *nut, AVPacket *pkt){ 00675 int i; 00676 int best_i = 0; 00677 int best_len= 0; 00678 00679 if(pkt->size > 4096) 00680 return 0; 00681 00682 for(i=1; i<nut->header_count; i++){ 00683 if( pkt->size >= nut->header_len[i] 00684 && nut->header_len[i] > best_len 00685 && !memcmp(pkt->data, nut->header[i], nut->header_len[i])){ 00686 best_i= i; 00687 best_len= nut->header_len[i]; 00688 } 00689 } 00690 return best_i; 00691 } 00692 00693 static int write_packet(AVFormatContext *s, AVPacket *pkt){ 00694 NUTContext *nut = s->priv_data; 00695 StreamContext *nus= &nut->stream[pkt->stream_index]; 00696 AVIOContext *bc = s->pb, *dyn_bc; 00697 FrameCode *fc; 00698 int64_t coded_pts; 00699 int best_length, frame_code, flags, needed_flags, i, header_idx, best_header_idx; 00700 int key_frame = !!(pkt->flags & AV_PKT_FLAG_KEY); 00701 int store_sp=0; 00702 int ret; 00703 00704 if(pkt->pts < 0) 00705 return -1; 00706 00707 if(1LL<<(20+3*nut->header_count) <= avio_tell(bc)) 00708 write_headers(s, bc); 00709 00710 if(key_frame && !(nus->last_flags & FLAG_KEY)) 00711 store_sp= 1; 00712 00713 if(pkt->size + 30/*FIXME check*/ + avio_tell(bc) >= nut->last_syncpoint_pos + nut->max_distance) 00714 store_sp= 1; 00715 00716 //FIXME: Ensure store_sp is 1 in the first place. 00717 00718 if(store_sp){ 00719 Syncpoint *sp, dummy= {.pos= INT64_MAX}; 00720 00721 ff_nut_reset_ts(nut, *nus->time_base, pkt->dts); 00722 for(i=0; i<s->nb_streams; i++){ 00723 AVStream *st= s->streams[i]; 00724 int64_t dts_tb = av_rescale_rnd(pkt->dts, 00725 nus->time_base->num * (int64_t)nut->stream[i].time_base->den, 00726 nus->time_base->den * (int64_t)nut->stream[i].time_base->num, 00727 AV_ROUND_DOWN); 00728 int index= av_index_search_timestamp(st, dts_tb, AVSEEK_FLAG_BACKWARD); 00729 if(index>=0) dummy.pos= FFMIN(dummy.pos, st->index_entries[index].pos); 00730 } 00731 if(dummy.pos == INT64_MAX) 00732 dummy.pos= 0; 00733 sp= av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp, 00734 NULL); 00735 00736 nut->last_syncpoint_pos= avio_tell(bc); 00737 ret = avio_open_dyn_buf(&dyn_bc); 00738 if(ret < 0) 00739 return ret; 00740 put_tt(nut, nus->time_base, dyn_bc, pkt->dts); 00741 ff_put_v(dyn_bc, sp ? (nut->last_syncpoint_pos - sp->pos)>>4 : 0); 00742 put_packet(nut, bc, dyn_bc, 1, SYNCPOINT_STARTCODE); 00743 00744 ff_nut_add_sp(nut, nut->last_syncpoint_pos, 0/*unused*/, pkt->dts); 00745 } 00746 assert(nus->last_pts != AV_NOPTS_VALUE); 00747 00748 coded_pts = pkt->pts & ((1<<nus->msb_pts_shift)-1); 00749 if(ff_lsb2full(nus, coded_pts) != pkt->pts) 00750 coded_pts= pkt->pts + (1<<nus->msb_pts_shift); 00751 00752 best_header_idx= find_best_header_idx(nut, pkt); 00753 00754 best_length=INT_MAX; 00755 frame_code= -1; 00756 for(i=0; i<256; i++){ 00757 int length= 0; 00758 FrameCode *fc= &nut->frame_code[i]; 00759 int flags= fc->flags; 00760 00761 if(flags & FLAG_INVALID) 00762 continue; 00763 needed_flags= get_needed_flags(nut, nus, fc, pkt); 00764 00765 if(flags & FLAG_CODED){ 00766 length++; 00767 flags = needed_flags; 00768 } 00769 00770 if((flags & needed_flags) != needed_flags) 00771 continue; 00772 00773 if((flags ^ needed_flags) & FLAG_KEY) 00774 continue; 00775 00776 if(flags & FLAG_STREAM_ID) 00777 length+= ff_get_v_length(pkt->stream_index); 00778 00779 if(pkt->size % fc->size_mul != fc->size_lsb) 00780 continue; 00781 if(flags & FLAG_SIZE_MSB) 00782 length += ff_get_v_length(pkt->size / fc->size_mul); 00783 00784 if(flags & FLAG_CHECKSUM) 00785 length+=4; 00786 00787 if(flags & FLAG_CODED_PTS) 00788 length += ff_get_v_length(coded_pts); 00789 00790 if( (flags & FLAG_CODED) 00791 && nut->header_len[best_header_idx] > nut->header_len[fc->header_idx]+1){ 00792 flags |= FLAG_HEADER_IDX; 00793 } 00794 00795 if(flags & FLAG_HEADER_IDX){ 00796 length += 1 - nut->header_len[best_header_idx]; 00797 }else{ 00798 length -= nut->header_len[fc->header_idx]; 00799 } 00800 00801 length*=4; 00802 length+= !(flags & FLAG_CODED_PTS); 00803 length+= !(flags & FLAG_CHECKSUM); 00804 00805 if(length < best_length){ 00806 best_length= length; 00807 frame_code=i; 00808 } 00809 } 00810 assert(frame_code != -1); 00811 fc= &nut->frame_code[frame_code]; 00812 flags= fc->flags; 00813 needed_flags= get_needed_flags(nut, nus, fc, pkt); 00814 header_idx= fc->header_idx; 00815 00816 ffio_init_checksum(bc, ff_crc04C11DB7_update, 0); 00817 avio_w8(bc, frame_code); 00818 if(flags & FLAG_CODED){ 00819 ff_put_v(bc, (flags^needed_flags) & ~(FLAG_CODED)); 00820 flags = needed_flags; 00821 } 00822 if(flags & FLAG_STREAM_ID) ff_put_v(bc, pkt->stream_index); 00823 if(flags & FLAG_CODED_PTS) ff_put_v(bc, coded_pts); 00824 if(flags & FLAG_SIZE_MSB) ff_put_v(bc, pkt->size / fc->size_mul); 00825 if(flags & FLAG_HEADER_IDX) ff_put_v(bc, header_idx= best_header_idx); 00826 00827 if(flags & FLAG_CHECKSUM) avio_wl32(bc, ffio_get_checksum(bc)); 00828 else ffio_get_checksum(bc); 00829 00830 avio_write(bc, pkt->data + nut->header_len[header_idx], pkt->size - nut->header_len[header_idx]); 00831 nus->last_flags= flags; 00832 nus->last_pts= pkt->pts; 00833 00834 //FIXME just store one per syncpoint 00835 if(flags & FLAG_KEY) 00836 av_add_index_entry( 00837 s->streams[pkt->stream_index], 00838 nut->last_syncpoint_pos, 00839 pkt->pts, 00840 0, 00841 0, 00842 AVINDEX_KEYFRAME); 00843 00844 return 0; 00845 } 00846 00847 static int write_trailer(AVFormatContext *s){ 00848 NUTContext *nut= s->priv_data; 00849 AVIOContext *bc= s->pb; 00850 00851 while(nut->header_count<3) 00852 write_headers(s, bc); 00853 avio_flush(bc); 00854 ff_nut_free_sp(nut); 00855 av_freep(&nut->stream); 00856 av_freep(&nut->chapter); 00857 av_freep(&nut->time_base); 00858 00859 return 0; 00860 } 00861 00862 AVOutputFormat ff_nut_muxer = { 00863 "nut", 00864 NULL_IF_CONFIG_SMALL("NUT format"), 00865 "video/x-nut", 00866 "nut", 00867 sizeof(NUTContext), 00868 #if CONFIG_LIBVORBIS 00869 CODEC_ID_VORBIS, 00870 #elif CONFIG_LIBMP3LAME 00871 CODEC_ID_MP3, 00872 #else 00873 CODEC_ID_MP2, 00874 #endif 00875 CODEC_ID_MPEG4, 00876 write_header, 00877 write_packet, 00878 write_trailer, 00879 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS, 00880 .codec_tag = (const AVCodecTag * const []){ ff_codec_bmp_tags, ff_nut_video_tags, ff_codec_wav_tags, ff_nut_subtitle_tags, 0 }, 00881 };