Libav
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00001 /* 00002 * nut muxer 00003 * Copyright (c) 2004-2007 Michael Niedermayer 00004 * 00005 * This file is part of FFmpeg. 00006 * 00007 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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 "libavcodec/mpegaudiodata.h" 00025 #include "nut.h" 00026 00027 static int find_expected_header(AVCodecContext *c, int size, int key_frame, uint8_t out[64]){ 00028 int sample_rate= c->sample_rate; 00029 00030 if(size>4096) 00031 return 0; 00032 00033 AV_WB24(out, 1); 00034 00035 if(c->codec_id == CODEC_ID_MPEG4){ 00036 if(key_frame){ 00037 return 3; 00038 }else{ 00039 out[3]= 0xB6; 00040 return 4; 00041 } 00042 }else if(c->codec_id == CODEC_ID_MPEG1VIDEO || c->codec_id == CODEC_ID_MPEG2VIDEO){ 00043 return 3; 00044 }else if(c->codec_id == CODEC_ID_H264){ 00045 return 3; 00046 }else if(c->codec_id == CODEC_ID_MP3 || c->codec_id == CODEC_ID_MP2){ 00047 int lsf, mpeg25, sample_rate_index, bitrate_index, frame_size; 00048 int layer= c->codec_id == CODEC_ID_MP3 ? 3 : 2; 00049 unsigned int header= 0xFFF00000; 00050 00051 lsf = sample_rate < (24000+32000)/2; 00052 mpeg25 = sample_rate < (12000+16000)/2; 00053 sample_rate <<= lsf + mpeg25; 00054 if (sample_rate < (32000 + 44100)/2) sample_rate_index=2; 00055 else if(sample_rate < (44100 + 48000)/2) sample_rate_index=0; 00056 else sample_rate_index=1; 00057 00058 sample_rate= ff_mpa_freq_tab[sample_rate_index] >> (lsf + mpeg25); 00059 00060 for(bitrate_index=2; bitrate_index<30; bitrate_index++){ 00061 frame_size = ff_mpa_bitrate_tab[lsf][layer-1][bitrate_index>>1]; 00062 frame_size = (frame_size * 144000) / (sample_rate << lsf) + (bitrate_index&1); 00063 00064 if(frame_size == size) 00065 break; 00066 } 00067 00068 header |= (!lsf)<<19; 00069 header |= (4-layer)<<17; 00070 header |= 1<<16; //no crc 00071 AV_WB32(out, header); 00072 if(size <= 0) 00073 return 2; //we guess there is no crc, if there is one the user clearly does not care about overhead 00074 if(bitrate_index == 30) 00075 return -1; //something is wrong ... 00076 00077 header |= (bitrate_index>>1)<<12; 00078 header |= sample_rate_index<<10; 00079 header |= (bitrate_index&1)<<9; 00080 00081 return 2; //FIXME actually put the needed ones in build_elision_headers() 00082 return 3; //we guess that the private bit is not set 00083 //FIXME the above assumptions should be checked, if these turn out false too often something should be done 00084 } 00085 return 0; 00086 } 00087 00088 static int find_header_idx(AVFormatContext *s, AVCodecContext *c, int size, int frame_type){ 00089 NUTContext *nut = s->priv_data; 00090 uint8_t out[64]; 00091 int i; 00092 int len= find_expected_header(c, size, frame_type, out); 00093 00094 //av_log(NULL, AV_LOG_ERROR, "expected_h len=%d size=%d codec_id=%d\n", len, size, c->codec_id); 00095 00096 for(i=1; i<nut->header_count; i++){ 00097 if( len == nut->header_len[i] 00098 && !memcmp(out, nut->header[i], len)){ 00099 // av_log(NULL, AV_LOG_ERROR, "found %d\n", i); 00100 return i; 00101 } 00102 } 00103 // av_log(NULL, AV_LOG_ERROR, "nothing found\n"); 00104 return 0; 00105 } 00106 00107 static void build_elision_headers(AVFormatContext *s){ 00108 NUTContext *nut = s->priv_data; 00109 int i; 00110 //FIXME this is lame 00111 //FIXME write a 2pass mode to find the maximal headers 00112 static const uint8_t headers[][5]={ 00113 {3, 0x00, 0x00, 0x01}, 00114 {4, 0x00, 0x00, 0x01, 0xB6}, 00115 {2, 0xFF, 0xFA}, //mp3+crc 00116 {2, 0xFF, 0xFB}, //mp3 00117 {2, 0xFF, 0xFC}, //mp2+crc 00118 {2, 0xFF, 0xFD}, //mp2 00119 }; 00120 00121 nut->header_count= 7; 00122 for(i=1; i<nut->header_count; i++){ 00123 nut->header_len[i]= headers[i-1][0]; 00124 nut->header [i]= &headers[i-1][1]; 00125 } 00126 } 00127 00128 static void build_frame_code(AVFormatContext *s){ 00129 NUTContext *nut = s->priv_data; 00130 int key_frame, index, pred, stream_id; 00131 int start=1; 00132 int end= 254; 00133 int keyframe_0_esc= s->nb_streams > 2; 00134 int pred_table[10]; 00135 FrameCode *ft; 00136 00137 ft= &nut->frame_code[start]; 00138 ft->flags= FLAG_CODED; 00139 ft->size_mul=1; 00140 ft->pts_delta=1; 00141 start++; 00142 00143 if(keyframe_0_esc){ 00144 /* keyframe = 0 escape */ 00145 FrameCode *ft= &nut->frame_code[start]; 00146 ft->flags= FLAG_STREAM_ID | FLAG_SIZE_MSB | FLAG_CODED_PTS; 00147 ft->size_mul=1; 00148 start++; 00149 } 00150 00151 for(stream_id= 0; stream_id<s->nb_streams; stream_id++){ 00152 int start2= start + (end-start)*stream_id / s->nb_streams; 00153 int end2 = start + (end-start)*(stream_id+1) / s->nb_streams; 00154 AVCodecContext *codec = s->streams[stream_id]->codec; 00155 int is_audio= codec->codec_type == AVMEDIA_TYPE_AUDIO; 00156 int intra_only= /*codec->intra_only || */is_audio; 00157 int pred_count; 00158 00159 for(key_frame=0; key_frame<2; key_frame++){ 00160 if(intra_only && keyframe_0_esc && key_frame==0) 00161 continue; 00162 00163 { 00164 FrameCode *ft= &nut->frame_code[start2]; 00165 ft->flags= FLAG_KEY*key_frame; 00166 ft->flags|= FLAG_SIZE_MSB | FLAG_CODED_PTS; 00167 ft->stream_id= stream_id; 00168 ft->size_mul=1; 00169 if(is_audio) 00170 ft->header_idx= find_header_idx(s, codec, -1, key_frame); 00171 start2++; 00172 } 00173 } 00174 00175 key_frame= intra_only; 00176 #if 1 00177 if(is_audio){ 00178 int frame_bytes= codec->frame_size*(int64_t)codec->bit_rate / (8*codec->sample_rate); 00179 int pts; 00180 for(pts=0; pts<2; pts++){ 00181 for(pred=0; pred<2; pred++){ 00182 FrameCode *ft= &nut->frame_code[start2]; 00183 ft->flags= FLAG_KEY*key_frame; 00184 ft->stream_id= stream_id; 00185 ft->size_mul=frame_bytes + 2; 00186 ft->size_lsb=frame_bytes + pred; 00187 ft->pts_delta=pts; 00188 ft->header_idx= find_header_idx(s, codec, frame_bytes + pred, key_frame); 00189 start2++; 00190 } 00191 } 00192 }else{ 00193 FrameCode *ft= &nut->frame_code[start2]; 00194 ft->flags= FLAG_KEY | FLAG_SIZE_MSB; 00195 ft->stream_id= stream_id; 00196 ft->size_mul=1; 00197 ft->pts_delta=1; 00198 start2++; 00199 } 00200 #endif 00201 00202 if(codec->has_b_frames){ 00203 pred_count=5; 00204 pred_table[0]=-2; 00205 pred_table[1]=-1; 00206 pred_table[2]=1; 00207 pred_table[3]=3; 00208 pred_table[4]=4; 00209 }else if(codec->codec_id == CODEC_ID_VORBIS){ 00210 pred_count=3; 00211 pred_table[0]=2; 00212 pred_table[1]=9; 00213 pred_table[2]=16; 00214 }else{ 00215 pred_count=1; 00216 pred_table[0]=1; 00217 } 00218 00219 for(pred=0; pred<pred_count; pred++){ 00220 int start3= start2 + (end2-start2)*pred / pred_count; 00221 int end3 = start2 + (end2-start2)*(pred+1) / pred_count; 00222 00223 for(index=start3; index<end3; index++){ 00224 FrameCode *ft= &nut->frame_code[index]; 00225 ft->flags= FLAG_KEY*key_frame; 00226 ft->flags|= FLAG_SIZE_MSB; 00227 ft->stream_id= stream_id; 00228 //FIXME use single byte size and pred from last 00229 ft->size_mul= end3-start3; 00230 ft->size_lsb= index - start3; 00231 ft->pts_delta= pred_table[pred]; 00232 if(is_audio) 00233 ft->header_idx= find_header_idx(s, codec, -1, key_frame); 00234 } 00235 } 00236 } 00237 memmove(&nut->frame_code['N'+1], &nut->frame_code['N'], sizeof(FrameCode)*(255-'N')); 00238 nut->frame_code[ 0].flags= 00239 nut->frame_code[255].flags= 00240 nut->frame_code['N'].flags= FLAG_INVALID; 00241 } 00242 00246 static int get_length(uint64_t val){ 00247 int i=1; 00248 00249 while(val>>=7) 00250 i++; 00251 00252 return i; 00253 } 00254 00255 static void put_v(ByteIOContext *bc, uint64_t val){ 00256 int i= get_length(val); 00257 00258 while(--i>0) 00259 put_byte(bc, 128 | (val>>(7*i))); 00260 00261 put_byte(bc, val&127); 00262 } 00263 00264 static void put_tt(NUTContext *nut, StreamContext *nus, ByteIOContext *bc, uint64_t val){ 00265 val *= nut->time_base_count; 00266 val += nus->time_base - nut->time_base; 00267 put_v(bc, val); 00268 } 00269 00273 static void put_str(ByteIOContext *bc, const char *string){ 00274 int len= strlen(string); 00275 00276 put_v(bc, len); 00277 put_buffer(bc, string, len); 00278 } 00279 00280 static void put_s(ByteIOContext *bc, int64_t val){ 00281 put_v(bc, 2*FFABS(val) - (val>0)); 00282 } 00283 00284 #ifdef TRACE 00285 static inline void put_v_trace(ByteIOContext *bc, uint64_t v, char *file, char *func, int line){ 00286 av_log(NULL, AV_LOG_DEBUG, "put_v %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line); 00287 00288 put_v(bc, v); 00289 } 00290 00291 static inline void put_s_trace(ByteIOContext *bc, int64_t v, char *file, char *func, int line){ 00292 av_log(NULL, AV_LOG_DEBUG, "put_s %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line); 00293 00294 put_s(bc, v); 00295 } 00296 #define put_v(bc, v) put_v_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__) 00297 #define put_s(bc, v) put_s_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__) 00298 #endif 00299 00300 //FIXME remove calculate_checksum 00301 static void put_packet(NUTContext *nut, ByteIOContext *bc, ByteIOContext *dyn_bc, int calculate_checksum, uint64_t startcode){ 00302 uint8_t *dyn_buf=NULL; 00303 int dyn_size= url_close_dyn_buf(dyn_bc, &dyn_buf); 00304 int forw_ptr= dyn_size + 4*calculate_checksum; 00305 00306 if(forw_ptr > 4096) 00307 init_checksum(bc, ff_crc04C11DB7_update, 0); 00308 put_be64(bc, startcode); 00309 put_v(bc, forw_ptr); 00310 if(forw_ptr > 4096) 00311 put_le32(bc, get_checksum(bc)); 00312 00313 if(calculate_checksum) 00314 init_checksum(bc, ff_crc04C11DB7_update, 0); 00315 put_buffer(bc, dyn_buf, dyn_size); 00316 if(calculate_checksum) 00317 put_le32(bc, get_checksum(bc)); 00318 00319 av_free(dyn_buf); 00320 } 00321 00322 static void write_mainheader(NUTContext *nut, ByteIOContext *bc){ 00323 int i, j, tmp_pts, tmp_flags, tmp_stream, tmp_mul, tmp_size, tmp_fields, tmp_head_idx; 00324 int64_t tmp_match; 00325 00326 put_v(bc, 3); /* version */ 00327 put_v(bc, nut->avf->nb_streams); 00328 put_v(bc, nut->max_distance); 00329 put_v(bc, nut->time_base_count); 00330 00331 for(i=0; i<nut->time_base_count; i++){ 00332 put_v(bc, nut->time_base[i].num); 00333 put_v(bc, nut->time_base[i].den); 00334 } 00335 00336 tmp_pts=0; 00337 tmp_mul=1; 00338 tmp_stream=0; 00339 tmp_match= 1-(1LL<<62); 00340 tmp_head_idx= 0; 00341 for(i=0; i<256;){ 00342 tmp_fields=0; 00343 tmp_size=0; 00344 // tmp_res=0; 00345 if(tmp_pts != nut->frame_code[i].pts_delta) tmp_fields=1; 00346 if(tmp_mul != nut->frame_code[i].size_mul ) tmp_fields=2; 00347 if(tmp_stream != nut->frame_code[i].stream_id) tmp_fields=3; 00348 if(tmp_size != nut->frame_code[i].size_lsb ) tmp_fields=4; 00349 // if(tmp_res != nut->frame_code[i].res ) tmp_fields=5; 00350 if(tmp_head_idx!=nut->frame_code[i].header_idx)tmp_fields=8; 00351 00352 tmp_pts = nut->frame_code[i].pts_delta; 00353 tmp_flags = nut->frame_code[i].flags; 00354 tmp_stream= nut->frame_code[i].stream_id; 00355 tmp_mul = nut->frame_code[i].size_mul; 00356 tmp_size = nut->frame_code[i].size_lsb; 00357 // tmp_res = nut->frame_code[i].res; 00358 tmp_head_idx= nut->frame_code[i].header_idx; 00359 00360 for(j=0; i<256; j++,i++){ 00361 if(i == 'N'){ 00362 j--; 00363 continue; 00364 } 00365 if(nut->frame_code[i].pts_delta != tmp_pts ) break; 00366 if(nut->frame_code[i].flags != tmp_flags ) break; 00367 if(nut->frame_code[i].stream_id != tmp_stream) break; 00368 if(nut->frame_code[i].size_mul != tmp_mul ) break; 00369 if(nut->frame_code[i].size_lsb != tmp_size+j) break; 00370 // if(nut->frame_code[i].res != tmp_res ) break; 00371 if(nut->frame_code[i].header_idx!= tmp_head_idx) break; 00372 } 00373 if(j != tmp_mul - tmp_size) tmp_fields=6; 00374 00375 put_v(bc, tmp_flags); 00376 put_v(bc, tmp_fields); 00377 if(tmp_fields>0) put_s(bc, tmp_pts); 00378 if(tmp_fields>1) put_v(bc, tmp_mul); 00379 if(tmp_fields>2) put_v(bc, tmp_stream); 00380 if(tmp_fields>3) put_v(bc, tmp_size); 00381 if(tmp_fields>4) put_v(bc, 0 /*tmp_res*/); 00382 if(tmp_fields>5) put_v(bc, j); 00383 if(tmp_fields>6) put_v(bc, tmp_match); 00384 if(tmp_fields>7) put_v(bc, tmp_head_idx); 00385 } 00386 put_v(bc, nut->header_count-1); 00387 for(i=1; i<nut->header_count; i++){ 00388 put_v(bc, nut->header_len[i]); 00389 put_buffer(bc, nut->header[i], nut->header_len[i]); 00390 } 00391 } 00392 00393 static int write_streamheader(NUTContext *nut, ByteIOContext *bc, AVStream *st, int i){ 00394 AVCodecContext *codec = st->codec; 00395 put_v(bc, i); 00396 switch(codec->codec_type){ 00397 case AVMEDIA_TYPE_VIDEO: put_v(bc, 0); break; 00398 case AVMEDIA_TYPE_AUDIO: put_v(bc, 1); break; 00399 case AVMEDIA_TYPE_SUBTITLE: put_v(bc, 2); break; 00400 default : put_v(bc, 3); break; 00401 } 00402 put_v(bc, 4); 00403 if (codec->codec_tag){ 00404 put_le32(bc, codec->codec_tag); 00405 }else 00406 return -1; 00407 00408 put_v(bc, nut->stream[i].time_base - nut->time_base); 00409 put_v(bc, nut->stream[i].msb_pts_shift); 00410 put_v(bc, nut->stream[i].max_pts_distance); 00411 put_v(bc, codec->has_b_frames); 00412 put_byte(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */ 00413 00414 put_v(bc, codec->extradata_size); 00415 put_buffer(bc, codec->extradata, codec->extradata_size); 00416 00417 switch(codec->codec_type){ 00418 case AVMEDIA_TYPE_AUDIO: 00419 put_v(bc, codec->sample_rate); 00420 put_v(bc, 1); 00421 put_v(bc, codec->channels); 00422 break; 00423 case AVMEDIA_TYPE_VIDEO: 00424 put_v(bc, codec->width); 00425 put_v(bc, codec->height); 00426 00427 if(st->sample_aspect_ratio.num<=0 || st->sample_aspect_ratio.den<=0){ 00428 put_v(bc, 0); 00429 put_v(bc, 0); 00430 }else{ 00431 put_v(bc, st->sample_aspect_ratio.num); 00432 put_v(bc, st->sample_aspect_ratio.den); 00433 } 00434 put_v(bc, 0); /* csp type -- unknown */ 00435 break; 00436 default: 00437 break; 00438 } 00439 return 0; 00440 } 00441 00442 static int add_info(ByteIOContext *bc, const char *type, const char *value){ 00443 put_str(bc, type); 00444 put_s(bc, -1); 00445 put_str(bc, value); 00446 return 1; 00447 } 00448 00449 static int write_globalinfo(NUTContext *nut, ByteIOContext *bc){ 00450 AVFormatContext *s= nut->avf; 00451 AVMetadataTag *t = NULL; 00452 ByteIOContext *dyn_bc; 00453 uint8_t *dyn_buf=NULL; 00454 int count=0, dyn_size; 00455 int ret = url_open_dyn_buf(&dyn_bc); 00456 if(ret < 0) 00457 return ret; 00458 00459 while ((t = av_metadata_get(s->metadata, "", t, AV_METADATA_IGNORE_SUFFIX))) 00460 count += add_info(dyn_bc, t->key, t->value); 00461 00462 put_v(bc, 0); //stream_if_plus1 00463 put_v(bc, 0); //chapter_id 00464 put_v(bc, 0); //timestamp_start 00465 put_v(bc, 0); //length 00466 00467 put_v(bc, count); 00468 00469 dyn_size= url_close_dyn_buf(dyn_bc, &dyn_buf); 00470 put_buffer(bc, dyn_buf, dyn_size); 00471 av_free(dyn_buf); 00472 return 0; 00473 } 00474 00475 static int write_streaminfo(NUTContext *nut, ByteIOContext *bc, int stream_id){ 00476 AVFormatContext *s= nut->avf; 00477 AVStream* st = s->streams[stream_id]; 00478 ByteIOContext *dyn_bc; 00479 uint8_t *dyn_buf=NULL; 00480 int count=0, dyn_size, i; 00481 int ret = url_open_dyn_buf(&dyn_bc); 00482 if(ret < 0) 00483 return ret; 00484 00485 for (i=0; ff_nut_dispositions[i].flag; ++i) { 00486 if (st->disposition & ff_nut_dispositions[i].flag) 00487 count += add_info(dyn_bc, "Disposition", ff_nut_dispositions[i].str); 00488 } 00489 dyn_size = url_close_dyn_buf(dyn_bc, &dyn_buf); 00490 00491 if (count) { 00492 put_v(bc, stream_id + 1); //stream_id_plus1 00493 put_v(bc, 0); //chapter_id 00494 put_v(bc, 0); //timestamp_start 00495 put_v(bc, 0); //length 00496 00497 put_v(bc, count); 00498 00499 put_buffer(bc, dyn_buf, dyn_size); 00500 } 00501 00502 av_free(dyn_buf); 00503 return count; 00504 } 00505 00506 static int write_headers(NUTContext *nut, ByteIOContext *bc){ 00507 ByteIOContext *dyn_bc; 00508 int i, ret; 00509 00510 ret = url_open_dyn_buf(&dyn_bc); 00511 if(ret < 0) 00512 return ret; 00513 write_mainheader(nut, dyn_bc); 00514 put_packet(nut, bc, dyn_bc, 1, MAIN_STARTCODE); 00515 00516 for (i=0; i < nut->avf->nb_streams; i++){ 00517 ret = url_open_dyn_buf(&dyn_bc); 00518 if(ret < 0) 00519 return ret; 00520 write_streamheader(nut, dyn_bc, nut->avf->streams[i], i); 00521 put_packet(nut, bc, dyn_bc, 1, STREAM_STARTCODE); 00522 } 00523 00524 ret = url_open_dyn_buf(&dyn_bc); 00525 if(ret < 0) 00526 return ret; 00527 write_globalinfo(nut, dyn_bc); 00528 put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE); 00529 00530 for (i = 0; i < nut->avf->nb_streams; i++) { 00531 ret = url_open_dyn_buf(&dyn_bc); 00532 if(ret < 0) 00533 return ret; 00534 ret = write_streaminfo(nut, dyn_bc, i); 00535 if (ret < 0) 00536 return ret; 00537 if (ret > 0) 00538 put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE); 00539 else { 00540 uint8_t* buf; 00541 url_close_dyn_buf(dyn_bc, &buf); 00542 av_free(buf); 00543 } 00544 } 00545 00546 nut->last_syncpoint_pos= INT_MIN; 00547 nut->header_count++; 00548 return 0; 00549 } 00550 00551 static int write_header(AVFormatContext *s){ 00552 NUTContext *nut = s->priv_data; 00553 ByteIOContext *bc = s->pb; 00554 int i, j; 00555 00556 nut->avf= s; 00557 00558 nut->stream = av_mallocz(sizeof(StreamContext)*s->nb_streams); 00559 nut->time_base= av_mallocz(sizeof(AVRational )*s->nb_streams); 00560 00561 for(i=0; i<s->nb_streams; i++){ 00562 AVStream *st= s->streams[i]; 00563 int ssize; 00564 AVRational time_base; 00565 ff_parse_specific_params(st->codec, &time_base.den, &ssize, &time_base.num); 00566 00567 av_set_pts_info(st, 64, time_base.num, time_base.den); 00568 00569 for(j=0; j<nut->time_base_count; j++){ 00570 if(!memcmp(&time_base, &nut->time_base[j], sizeof(AVRational))){ 00571 break; 00572 } 00573 } 00574 nut->time_base[j]= time_base; 00575 nut->stream[i].time_base= &nut->time_base[j]; 00576 if(j==nut->time_base_count) 00577 nut->time_base_count++; 00578 00579 if(av_q2d(time_base) >= 0.001) 00580 nut->stream[i].msb_pts_shift = 7; 00581 else 00582 nut->stream[i].msb_pts_shift = 14; 00583 nut->stream[i].max_pts_distance= FFMAX(1/av_q2d(time_base), 1); 00584 } 00585 00586 nut->max_distance = MAX_DISTANCE; 00587 build_elision_headers(s); 00588 build_frame_code(s); 00589 assert(nut->frame_code['N'].flags == FLAG_INVALID); 00590 00591 put_buffer(bc, ID_STRING, strlen(ID_STRING)); 00592 put_byte(bc, 0); 00593 00594 write_headers(nut, bc); 00595 00596 put_flush_packet(bc); 00597 00598 //FIXME index 00599 00600 return 0; 00601 } 00602 00603 static int get_needed_flags(NUTContext *nut, StreamContext *nus, FrameCode *fc, AVPacket *pkt){ 00604 int flags= 0; 00605 00606 if(pkt->flags & AV_PKT_FLAG_KEY ) flags |= FLAG_KEY; 00607 if(pkt->stream_index != fc->stream_id ) flags |= FLAG_STREAM_ID; 00608 if(pkt->size / fc->size_mul ) flags |= FLAG_SIZE_MSB; 00609 if(pkt->pts - nus->last_pts != fc->pts_delta) flags |= FLAG_CODED_PTS; 00610 if(pkt->size > 2*nut->max_distance ) flags |= FLAG_CHECKSUM; 00611 if(FFABS(pkt->pts - nus->last_pts) 00612 > nus->max_pts_distance) flags |= FLAG_CHECKSUM; 00613 if( pkt->size < nut->header_len[fc->header_idx] 00614 || (pkt->size > 4096 && fc->header_idx) 00615 || memcmp(pkt->data, nut->header[fc->header_idx], nut->header_len[fc->header_idx])) 00616 flags |= FLAG_HEADER_IDX; 00617 00618 return flags | (fc->flags & FLAG_CODED); 00619 } 00620 00621 static int find_best_header_idx(NUTContext *nut, AVPacket *pkt){ 00622 int i; 00623 int best_i = 0; 00624 int best_len= 0; 00625 00626 if(pkt->size > 4096) 00627 return 0; 00628 00629 for(i=1; i<nut->header_count; i++){ 00630 if( pkt->size >= nut->header_len[i] 00631 && nut->header_len[i] > best_len 00632 && !memcmp(pkt->data, nut->header[i], nut->header_len[i])){ 00633 best_i= i; 00634 best_len= nut->header_len[i]; 00635 } 00636 } 00637 return best_i; 00638 } 00639 00640 static int write_packet(AVFormatContext *s, AVPacket *pkt){ 00641 NUTContext *nut = s->priv_data; 00642 StreamContext *nus= &nut->stream[pkt->stream_index]; 00643 ByteIOContext *bc = s->pb, *dyn_bc; 00644 FrameCode *fc; 00645 int64_t coded_pts; 00646 int best_length, frame_code, flags, needed_flags, i, header_idx, best_header_idx; 00647 int key_frame = !!(pkt->flags & AV_PKT_FLAG_KEY); 00648 int store_sp=0; 00649 int ret; 00650 00651 if(pkt->pts < 0) 00652 return -1; 00653 00654 if(1LL<<(20+3*nut->header_count) <= url_ftell(bc)) 00655 write_headers(nut, bc); 00656 00657 if(key_frame && !(nus->last_flags & FLAG_KEY)) 00658 store_sp= 1; 00659 00660 if(pkt->size + 30/*FIXME check*/ + url_ftell(bc) >= nut->last_syncpoint_pos + nut->max_distance) 00661 store_sp= 1; 00662 00663 //FIXME: Ensure store_sp is 1 in the first place. 00664 00665 if(store_sp){ 00666 Syncpoint *sp, dummy= {.pos= INT64_MAX}; 00667 00668 ff_nut_reset_ts(nut, *nus->time_base, pkt->dts); 00669 for(i=0; i<s->nb_streams; i++){ 00670 AVStream *st= s->streams[i]; 00671 int64_t dts_tb = av_rescale_rnd(pkt->dts, 00672 nus->time_base->num * (int64_t)nut->stream[i].time_base->den, 00673 nus->time_base->den * (int64_t)nut->stream[i].time_base->num, 00674 AV_ROUND_DOWN); 00675 int index= av_index_search_timestamp(st, dts_tb, AVSEEK_FLAG_BACKWARD); 00676 if(index>=0) dummy.pos= FFMIN(dummy.pos, st->index_entries[index].pos); 00677 } 00678 if(dummy.pos == INT64_MAX) 00679 dummy.pos= 0; 00680 sp= av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp, 00681 NULL); 00682 00683 nut->last_syncpoint_pos= url_ftell(bc); 00684 ret = url_open_dyn_buf(&dyn_bc); 00685 if(ret < 0) 00686 return ret; 00687 put_tt(nut, nus, dyn_bc, pkt->dts); 00688 put_v(dyn_bc, sp ? (nut->last_syncpoint_pos - sp->pos)>>4 : 0); 00689 put_packet(nut, bc, dyn_bc, 1, SYNCPOINT_STARTCODE); 00690 00691 ff_nut_add_sp(nut, nut->last_syncpoint_pos, 0/*unused*/, pkt->dts); 00692 } 00693 assert(nus->last_pts != AV_NOPTS_VALUE); 00694 00695 coded_pts = pkt->pts & ((1<<nus->msb_pts_shift)-1); 00696 if(ff_lsb2full(nus, coded_pts) != pkt->pts) 00697 coded_pts= pkt->pts + (1<<nus->msb_pts_shift); 00698 00699 best_header_idx= find_best_header_idx(nut, pkt); 00700 00701 best_length=INT_MAX; 00702 frame_code= -1; 00703 for(i=0; i<256; i++){ 00704 int length= 0; 00705 FrameCode *fc= &nut->frame_code[i]; 00706 int flags= fc->flags; 00707 00708 if(flags & FLAG_INVALID) 00709 continue; 00710 needed_flags= get_needed_flags(nut, nus, fc, pkt); 00711 00712 if(flags & FLAG_CODED){ 00713 length++; 00714 flags = needed_flags; 00715 } 00716 00717 if((flags & needed_flags) != needed_flags) 00718 continue; 00719 00720 if((flags ^ needed_flags) & FLAG_KEY) 00721 continue; 00722 00723 if(flags & FLAG_STREAM_ID) 00724 length+= get_length(pkt->stream_index); 00725 00726 if(pkt->size % fc->size_mul != fc->size_lsb) 00727 continue; 00728 if(flags & FLAG_SIZE_MSB) 00729 length += get_length(pkt->size / fc->size_mul); 00730 00731 if(flags & FLAG_CHECKSUM) 00732 length+=4; 00733 00734 if(flags & FLAG_CODED_PTS) 00735 length += get_length(coded_pts); 00736 00737 if( (flags & FLAG_CODED) 00738 && nut->header_len[best_header_idx] > nut->header_len[fc->header_idx]+1){ 00739 flags |= FLAG_HEADER_IDX; 00740 } 00741 00742 if(flags & FLAG_HEADER_IDX){ 00743 length += 1 - nut->header_len[best_header_idx]; 00744 }else{ 00745 length -= nut->header_len[fc->header_idx]; 00746 } 00747 00748 length*=4; 00749 length+= !(flags & FLAG_CODED_PTS); 00750 length+= !(flags & FLAG_CHECKSUM); 00751 00752 if(length < best_length){ 00753 best_length= length; 00754 frame_code=i; 00755 } 00756 } 00757 assert(frame_code != -1); 00758 fc= &nut->frame_code[frame_code]; 00759 flags= fc->flags; 00760 needed_flags= get_needed_flags(nut, nus, fc, pkt); 00761 header_idx= fc->header_idx; 00762 00763 init_checksum(bc, ff_crc04C11DB7_update, 0); 00764 put_byte(bc, frame_code); 00765 if(flags & FLAG_CODED){ 00766 put_v(bc, (flags^needed_flags) & ~(FLAG_CODED)); 00767 flags = needed_flags; 00768 } 00769 if(flags & FLAG_STREAM_ID) put_v(bc, pkt->stream_index); 00770 if(flags & FLAG_CODED_PTS) put_v(bc, coded_pts); 00771 if(flags & FLAG_SIZE_MSB) put_v(bc, pkt->size / fc->size_mul); 00772 if(flags & FLAG_HEADER_IDX) put_v(bc, header_idx= best_header_idx); 00773 00774 if(flags & FLAG_CHECKSUM) put_le32(bc, get_checksum(bc)); 00775 else get_checksum(bc); 00776 00777 put_buffer(bc, pkt->data + nut->header_len[header_idx], pkt->size - nut->header_len[header_idx]); 00778 nus->last_flags= flags; 00779 nus->last_pts= pkt->pts; 00780 00781 //FIXME just store one per syncpoint 00782 if(flags & FLAG_KEY) 00783 av_add_index_entry( 00784 s->streams[pkt->stream_index], 00785 nut->last_syncpoint_pos, 00786 pkt->pts, 00787 0, 00788 0, 00789 AVINDEX_KEYFRAME); 00790 00791 return 0; 00792 } 00793 00794 static int write_trailer(AVFormatContext *s){ 00795 NUTContext *nut= s->priv_data; 00796 ByteIOContext *bc= s->pb; 00797 00798 while(nut->header_count<3) 00799 write_headers(nut, bc); 00800 put_flush_packet(bc); 00801 ff_nut_free_sp(nut); 00802 av_freep(&nut->stream); 00803 av_freep(&nut->time_base); 00804 00805 return 0; 00806 } 00807 00808 AVOutputFormat nut_muxer = { 00809 "nut", 00810 NULL_IF_CONFIG_SMALL("NUT format"), 00811 "video/x-nut", 00812 "nut", 00813 sizeof(NUTContext), 00814 #if CONFIG_LIBVORBIS 00815 CODEC_ID_VORBIS, 00816 #elif CONFIG_LIBMP3LAME 00817 CODEC_ID_MP3, 00818 #else 00819 CODEC_ID_MP2, 00820 #endif 00821 CODEC_ID_MPEG4, 00822 write_header, 00823 write_packet, 00824 write_trailer, 00825 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS, 00826 .codec_tag= (const AVCodecTag* const []){ff_codec_bmp_tags, ff_codec_wav_tags, ff_nut_subtitle_tags, 0}, 00827 .metadata_conv = ff_nut_metadata_conv, 00828 };