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00022 #include "nut.h"
00023 #include "tree.h"
00024
00025 static void build_frame_code(AVFormatContext *s){
00026 NUTContext *nut = s->priv_data;
00027 int key_frame, index, pred, stream_id;
00028 int start=1;
00029 int end= 254;
00030 int keyframe_0_esc= s->nb_streams > 2;
00031 int pred_table[10];
00032 FrameCode *ft;
00033
00034 ft= &nut->frame_code[start];
00035 ft->flags= FLAG_CODED;
00036 ft->size_mul=1;
00037 ft->pts_delta=1;
00038 start++;
00039
00040 if(keyframe_0_esc){
00041
00042 FrameCode *ft= &nut->frame_code[start];
00043 ft->flags= FLAG_STREAM_ID | FLAG_SIZE_MSB | FLAG_CODED_PTS;
00044 ft->size_mul=1;
00045 start++;
00046 }
00047
00048 for(stream_id= 0; stream_id<s->nb_streams; stream_id++){
00049 int start2= start + (end-start)*stream_id / s->nb_streams;
00050 int end2 = start + (end-start)*(stream_id+1) / s->nb_streams;
00051 AVCodecContext *codec = s->streams[stream_id]->codec;
00052 int is_audio= codec->codec_type == CODEC_TYPE_AUDIO;
00053 int intra_only= is_audio;
00054 int pred_count;
00055
00056 for(key_frame=0; key_frame<2; key_frame++){
00057 if(intra_only && keyframe_0_esc && key_frame==0)
00058 continue;
00059
00060 {
00061 FrameCode *ft= &nut->frame_code[start2];
00062 ft->flags= FLAG_KEY*key_frame;
00063 ft->flags|= FLAG_SIZE_MSB | FLAG_CODED_PTS;
00064 ft->stream_id= stream_id;
00065 ft->size_mul=1;
00066 start2++;
00067 }
00068 }
00069
00070 key_frame= intra_only;
00071 #if 1
00072 if(is_audio){
00073 int frame_bytes= codec->frame_size*(int64_t)codec->bit_rate / (8*codec->sample_rate);
00074 int pts;
00075 for(pts=0; pts<2; pts++){
00076 for(pred=0; pred<2; pred++){
00077 FrameCode *ft= &nut->frame_code[start2];
00078 ft->flags= FLAG_KEY*key_frame;
00079 ft->stream_id= stream_id;
00080 ft->size_mul=frame_bytes + 2;
00081 ft->size_lsb=frame_bytes + pred;
00082 ft->pts_delta=pts;
00083 start2++;
00084 }
00085 }
00086 }else{
00087 FrameCode *ft= &nut->frame_code[start2];
00088 ft->flags= FLAG_KEY | FLAG_SIZE_MSB;
00089 ft->stream_id= stream_id;
00090 ft->size_mul=1;
00091 ft->pts_delta=1;
00092 start2++;
00093 }
00094 #endif
00095
00096 if(codec->has_b_frames){
00097 pred_count=5;
00098 pred_table[0]=-2;
00099 pred_table[1]=-1;
00100 pred_table[2]=1;
00101 pred_table[3]=3;
00102 pred_table[4]=4;
00103 }else if(codec->codec_id == CODEC_ID_VORBIS){
00104 pred_count=3;
00105 pred_table[0]=2;
00106 pred_table[1]=9;
00107 pred_table[2]=16;
00108 }else{
00109 pred_count=1;
00110 pred_table[0]=1;
00111 }
00112
00113 for(pred=0; pred<pred_count; pred++){
00114 int start3= start2 + (end2-start2)*pred / pred_count;
00115 int end3 = start2 + (end2-start2)*(pred+1) / pred_count;
00116
00117 for(index=start3; index<end3; index++){
00118 FrameCode *ft= &nut->frame_code[index];
00119 ft->flags= FLAG_KEY*key_frame;
00120 ft->flags|= FLAG_SIZE_MSB;
00121 ft->stream_id= stream_id;
00122
00123 ft->size_mul= end3-start3;
00124 ft->size_lsb= index - start3;
00125 ft->pts_delta= pred_table[pred];
00126 }
00127 }
00128 }
00129 memmove(&nut->frame_code['N'+1], &nut->frame_code['N'], sizeof(FrameCode)*(255-'N'));
00130 nut->frame_code[ 0].flags=
00131 nut->frame_code[255].flags=
00132 nut->frame_code['N'].flags= FLAG_INVALID;
00133 }
00134
00138 static int get_length(uint64_t val){
00139 int i=1;
00140
00141 while(val>>=7)
00142 i++;
00143
00144 return i;
00145 }
00146
00147 static void put_v(ByteIOContext *bc, uint64_t val){
00148 int i= get_length(val);
00149
00150 while(--i>0)
00151 put_byte(bc, 128 | (val>>(7*i)));
00152
00153 put_byte(bc, val&127);
00154 }
00155
00156 static void put_t(NUTContext *nut, StreamContext *nus, ByteIOContext *bc, uint64_t val){
00157 val *= nut->time_base_count;
00158 val += nus->time_base - nut->time_base;
00159 put_v(bc, val);
00160 }
00161
00165 static void put_str(ByteIOContext *bc, const char *string){
00166 int len= strlen(string);
00167
00168 put_v(bc, len);
00169 put_buffer(bc, string, len);
00170 }
00171
00172 static void put_s(ByteIOContext *bc, int64_t val){
00173 put_v(bc, 2*FFABS(val) - (val>0));
00174 }
00175
00176 #ifdef TRACE
00177 static inline void put_v_trace(ByteIOContext *bc, uint64_t v, char *file, char *func, int line){
00178 av_log(NULL, AV_LOG_DEBUG, "put_v %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
00179
00180 put_v(bc, v);
00181 }
00182
00183 static inline void put_s_trace(ByteIOContext *bc, int64_t v, char *file, char *func, int line){
00184 av_log(NULL, AV_LOG_DEBUG, "put_s %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
00185
00186 put_s(bc, v);
00187 }
00188 #define put_v(bc, v) put_v_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
00189 #define put_s(bc, v) put_s_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
00190 #endif
00191
00192
00193 static void put_packet(NUTContext *nut, ByteIOContext *bc, ByteIOContext *dyn_bc, int calculate_checksum, uint64_t startcode){
00194 uint8_t *dyn_buf=NULL;
00195 int dyn_size= url_close_dyn_buf(dyn_bc, &dyn_buf);
00196 int forw_ptr= dyn_size + 4*calculate_checksum;
00197
00198 if(forw_ptr > 4096)
00199 init_checksum(bc, ff_crc04C11DB7_update, 0);
00200 put_be64(bc, startcode);
00201 put_v(bc, forw_ptr);
00202 if(forw_ptr > 4096)
00203 put_le32(bc, get_checksum(bc));
00204
00205 if(calculate_checksum)
00206 init_checksum(bc, ff_crc04C11DB7_update, 0);
00207 put_buffer(bc, dyn_buf, dyn_size);
00208 if(calculate_checksum)
00209 put_le32(bc, get_checksum(bc));
00210
00211 av_free(dyn_buf);
00212 }
00213
00214 static void write_mainheader(NUTContext *nut, ByteIOContext *bc){
00215 int i, j, tmp_pts, tmp_flags, tmp_stream, tmp_mul, tmp_size, tmp_fields;
00216
00217 put_v(bc, 3);
00218 put_v(bc, nut->avf->nb_streams);
00219 put_v(bc, nut->max_distance);
00220 put_v(bc, nut->time_base_count);
00221
00222 for(i=0; i<nut->time_base_count; i++){
00223 put_v(bc, nut->time_base[i].num);
00224 put_v(bc, nut->time_base[i].den);
00225 }
00226
00227 tmp_pts=0;
00228 tmp_mul=1;
00229 tmp_stream=0;
00230 for(i=0; i<256;){
00231 tmp_fields=0;
00232 tmp_size=0;
00233
00234 if(tmp_pts != nut->frame_code[i].pts_delta) tmp_fields=1;
00235 if(tmp_mul != nut->frame_code[i].size_mul ) tmp_fields=2;
00236 if(tmp_stream != nut->frame_code[i].stream_id) tmp_fields=3;
00237 if(tmp_size != nut->frame_code[i].size_lsb ) tmp_fields=4;
00238
00239
00240 tmp_pts = nut->frame_code[i].pts_delta;
00241 tmp_flags = nut->frame_code[i].flags;
00242 tmp_stream= nut->frame_code[i].stream_id;
00243 tmp_mul = nut->frame_code[i].size_mul;
00244 tmp_size = nut->frame_code[i].size_lsb;
00245
00246
00247 for(j=0; i<256; j++,i++){
00248 if(i == 'N'){
00249 j--;
00250 continue;
00251 }
00252 if(nut->frame_code[i].pts_delta != tmp_pts ) break;
00253 if(nut->frame_code[i].flags != tmp_flags ) break;
00254 if(nut->frame_code[i].stream_id != tmp_stream) break;
00255 if(nut->frame_code[i].size_mul != tmp_mul ) break;
00256 if(nut->frame_code[i].size_lsb != tmp_size+j) break;
00257
00258 }
00259 if(j != tmp_mul - tmp_size) tmp_fields=6;
00260
00261 put_v(bc, tmp_flags);
00262 put_v(bc, tmp_fields);
00263 if(tmp_fields>0) put_s(bc, tmp_pts);
00264 if(tmp_fields>1) put_v(bc, tmp_mul);
00265 if(tmp_fields>2) put_v(bc, tmp_stream);
00266 if(tmp_fields>3) put_v(bc, tmp_size);
00267 if(tmp_fields>4) put_v(bc, 0 );
00268 if(tmp_fields>5) put_v(bc, j);
00269 }
00270 }
00271
00272 static int write_streamheader(NUTContext *nut, ByteIOContext *bc, AVCodecContext *codec, int i){
00273 put_v(bc, i);
00274 switch(codec->codec_type){
00275 case CODEC_TYPE_VIDEO: put_v(bc, 0); break;
00276 case CODEC_TYPE_AUDIO: put_v(bc, 1); break;
00277
00278 default : put_v(bc, 3); break;
00279 }
00280 put_v(bc, 4);
00281 if (codec->codec_tag){
00282 put_le32(bc, codec->codec_tag);
00283 }else
00284 return -1;
00285
00286 put_v(bc, nut->stream[i].time_base - nut->time_base);
00287 put_v(bc, nut->stream[i].msb_pts_shift);
00288 put_v(bc, nut->stream[i].max_pts_distance);
00289 put_v(bc, codec->has_b_frames);
00290 put_byte(bc, 0);
00291
00292 put_v(bc, codec->extradata_size);
00293 put_buffer(bc, codec->extradata, codec->extradata_size);
00294
00295 switch(codec->codec_type){
00296 case CODEC_TYPE_AUDIO:
00297 put_v(bc, codec->sample_rate);
00298 put_v(bc, 1);
00299 put_v(bc, codec->channels);
00300 break;
00301 case CODEC_TYPE_VIDEO:
00302 put_v(bc, codec->width);
00303 put_v(bc, codec->height);
00304
00305 if(codec->sample_aspect_ratio.num<=0 || codec->sample_aspect_ratio.den<=0){
00306 put_v(bc, 0);
00307 put_v(bc, 0);
00308 }else{
00309 put_v(bc, codec->sample_aspect_ratio.num);
00310 put_v(bc, codec->sample_aspect_ratio.den);
00311 }
00312 put_v(bc, 0);
00313 break;
00314 default:
00315 break;
00316 }
00317 return 0;
00318 }
00319
00320 static int add_info(ByteIOContext *bc, const char *type, const char *value){
00321 put_str(bc, type);
00322 put_s(bc, -1);
00323 put_str(bc, value);
00324 return 1;
00325 }
00326
00327 static int write_globalinfo(NUTContext *nut, ByteIOContext *bc){
00328 AVFormatContext *s= nut->avf;
00329 ByteIOContext *dyn_bc;
00330 uint8_t *dyn_buf=NULL;
00331 int count=0, dyn_size;
00332 int ret = url_open_dyn_buf(&dyn_bc);
00333 if(ret < 0)
00334 return ret;
00335
00336 if(s->title [0]) count+= add_info(dyn_bc, "Title" , s->title);
00337 if(s->author [0]) count+= add_info(dyn_bc, "Author" , s->author);
00338 if(s->copyright[0]) count+= add_info(dyn_bc, "Copyright", s->copyright);
00339 if(!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT))
00340 count+= add_info(dyn_bc, "Encoder" , LIBAVFORMAT_IDENT);
00341
00342 put_v(bc, 0);
00343 put_v(bc, 0);
00344 put_v(bc, 0);
00345 put_v(bc, 0);
00346
00347 put_v(bc, count);
00348
00349 dyn_size= url_close_dyn_buf(dyn_bc, &dyn_buf);
00350 put_buffer(bc, dyn_buf, dyn_size);
00351 av_free(dyn_buf);
00352 return 0;
00353 }
00354
00355 static int write_headers(NUTContext *nut, ByteIOContext *bc){
00356 ByteIOContext *dyn_bc;
00357 int i, ret;
00358
00359 ret = url_open_dyn_buf(&dyn_bc);
00360 if(ret < 0)
00361 return ret;
00362 write_mainheader(nut, dyn_bc);
00363 put_packet(nut, bc, dyn_bc, 1, MAIN_STARTCODE);
00364
00365 for (i=0; i < nut->avf->nb_streams; i++){
00366 AVCodecContext *codec = nut->avf->streams[i]->codec;
00367
00368 ret = url_open_dyn_buf(&dyn_bc);
00369 if(ret < 0)
00370 return ret;
00371 write_streamheader(nut, dyn_bc, codec, i);
00372 put_packet(nut, bc, dyn_bc, 1, STREAM_STARTCODE);
00373 }
00374
00375 ret = url_open_dyn_buf(&dyn_bc);
00376 if(ret < 0)
00377 return ret;
00378 write_globalinfo(nut, dyn_bc);
00379 put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
00380
00381 nut->last_syncpoint_pos= INT_MIN;
00382 nut->header_count++;
00383 return 0;
00384 }
00385
00386 static int write_header(AVFormatContext *s){
00387 NUTContext *nut = s->priv_data;
00388 ByteIOContext *bc = s->pb;
00389 int i, j;
00390
00391 nut->avf= s;
00392
00393 nut->stream = av_mallocz(sizeof(StreamContext)*s->nb_streams);
00394 nut->time_base= av_mallocz(sizeof(AVRational )*s->nb_streams);
00395
00396 for(i=0; i<s->nb_streams; i++){
00397 AVStream *st= s->streams[i];
00398 int ssize;
00399 AVRational time_base;
00400 ff_parse_specific_params(st->codec, &time_base.den, &ssize, &time_base.num);
00401
00402 av_set_pts_info(st, 64, time_base.num, time_base.den);
00403
00404 for(j=0; j<nut->time_base_count; j++){
00405 if(!memcmp(&time_base, &nut->time_base[j], sizeof(AVRational))){
00406 break;
00407 }
00408 }
00409 nut->time_base[j]= time_base;
00410 nut->stream[i].time_base= &nut->time_base[j];
00411 if(j==nut->time_base_count)
00412 nut->time_base_count++;
00413
00414 if(av_q2d(time_base) >= 0.001)
00415 nut->stream[i].msb_pts_shift = 7;
00416 else
00417 nut->stream[i].msb_pts_shift = 14;
00418 nut->stream[i].max_pts_distance= FFMAX(1/av_q2d(time_base), 1);
00419 }
00420
00421 nut->max_distance = MAX_DISTANCE;
00422 build_frame_code(s);
00423 assert(nut->frame_code['N'].flags == FLAG_INVALID);
00424
00425 put_buffer(bc, ID_STRING, strlen(ID_STRING));
00426 put_byte(bc, 0);
00427
00428 write_headers(nut, bc);
00429
00430 put_flush_packet(bc);
00431
00432
00433
00434 return 0;
00435 }
00436
00437 static int get_needed_flags(NUTContext *nut, StreamContext *nus, FrameCode *fc, AVPacket *pkt){
00438 int flags= 0;
00439
00440 if(pkt->flags & PKT_FLAG_KEY ) flags |= FLAG_KEY;
00441 if(pkt->stream_index != fc->stream_id ) flags |= FLAG_STREAM_ID;
00442 if(pkt->size / fc->size_mul ) flags |= FLAG_SIZE_MSB;
00443 if(pkt->pts - nus->last_pts != fc->pts_delta) flags |= FLAG_CODED_PTS;
00444 if(pkt->size > 2*nut->max_distance ) flags |= FLAG_CHECKSUM;
00445 if(FFABS(pkt->pts - nus->last_pts)
00446 > nus->max_pts_distance) flags |= FLAG_CHECKSUM;
00447
00448 return flags | (fc->flags & FLAG_CODED);
00449 }
00450
00451 static int write_packet(AVFormatContext *s, AVPacket *pkt){
00452 NUTContext *nut = s->priv_data;
00453 StreamContext *nus= &nut->stream[pkt->stream_index];
00454 ByteIOContext *bc = s->pb, *dyn_bc;
00455 FrameCode *fc;
00456 int64_t coded_pts;
00457 int best_length, frame_code, flags, needed_flags, i;
00458 int key_frame = !!(pkt->flags & PKT_FLAG_KEY);
00459 int store_sp=0;
00460 int ret;
00461
00462 if(1LL<<(20+3*nut->header_count) <= url_ftell(bc))
00463 write_headers(nut, bc);
00464
00465 if(key_frame && !(nus->last_flags & FLAG_KEY))
00466 store_sp= 1;
00467
00468 if(pkt->size + 30 + url_ftell(bc) >= nut->last_syncpoint_pos + nut->max_distance)
00469 store_sp= 1;
00470
00471
00472
00473 if(store_sp){
00474 syncpoint_t *sp, dummy= {.pos= INT64_MAX};
00475
00476 ff_nut_reset_ts(nut, *nus->time_base, pkt->dts);
00477 for(i=0; i<s->nb_streams; i++){
00478 AVStream *st= s->streams[i];
00479 int64_t dts_tb = av_rescale_rnd(pkt->dts,
00480 nus->time_base->num * (int64_t)nut->stream[i].time_base->den,
00481 nus->time_base->den * (int64_t)nut->stream[i].time_base->num,
00482 AV_ROUND_DOWN);
00483 int index= av_index_search_timestamp(st, dts_tb, AVSEEK_FLAG_BACKWARD);
00484 if(index>=0) dummy.pos= FFMIN(dummy.pos, st->index_entries[index].pos);
00485 }
00486 if(dummy.pos == INT64_MAX)
00487 dummy.pos= 0;
00488 sp= av_tree_find(nut->syncpoints, &dummy, ff_nut_sp_pos_cmp, NULL);
00489
00490 nut->last_syncpoint_pos= url_ftell(bc);
00491 ret = url_open_dyn_buf(&dyn_bc);
00492 if(ret < 0)
00493 return ret;
00494 put_t(nut, nus, dyn_bc, pkt->dts);
00495 put_v(dyn_bc, sp ? (nut->last_syncpoint_pos - sp->pos)>>4 : 0);
00496 put_packet(nut, bc, dyn_bc, 1, SYNCPOINT_STARTCODE);
00497
00498 ff_nut_add_sp(nut, nut->last_syncpoint_pos, 0, pkt->dts);
00499 }
00500 assert(nus->last_pts != AV_NOPTS_VALUE);
00501
00502 coded_pts = pkt->pts & ((1<<nus->msb_pts_shift)-1);
00503 if(ff_lsb2full(nus, coded_pts) != pkt->pts)
00504 coded_pts= pkt->pts + (1<<nus->msb_pts_shift);
00505
00506 best_length=INT_MAX;
00507 frame_code= -1;
00508 for(i=0; i<256; i++){
00509 int length= 0;
00510 FrameCode *fc= &nut->frame_code[i];
00511 int flags= fc->flags;
00512
00513 if(flags & FLAG_INVALID)
00514 continue;
00515 needed_flags= get_needed_flags(nut, nus, fc, pkt);
00516
00517 if(flags & FLAG_CODED){
00518 length++;
00519 flags = needed_flags;
00520 }
00521
00522 if((flags & needed_flags) != needed_flags)
00523 continue;
00524
00525 if((flags ^ needed_flags) & FLAG_KEY)
00526 continue;
00527
00528 if(flags & FLAG_STREAM_ID)
00529 length+= get_length(pkt->stream_index);
00530
00531 if(pkt->size % fc->size_mul != fc->size_lsb)
00532 continue;
00533 if(flags & FLAG_SIZE_MSB)
00534 length += get_length(pkt->size / fc->size_mul);
00535
00536 if(flags & FLAG_CHECKSUM)
00537 length+=4;
00538
00539 if(flags & FLAG_CODED_PTS)
00540 length += get_length(coded_pts);
00541
00542 length*=4;
00543 length+= !(flags & FLAG_CODED_PTS);
00544 length+= !(flags & FLAG_CHECKSUM);
00545
00546 if(length < best_length){
00547 best_length= length;
00548 frame_code=i;
00549 }
00550 }
00551 assert(frame_code != -1);
00552 fc= &nut->frame_code[frame_code];
00553 flags= fc->flags;
00554 needed_flags= get_needed_flags(nut, nus, fc, pkt);
00555
00556 init_checksum(bc, ff_crc04C11DB7_update, 0);
00557 put_byte(bc, frame_code);
00558 if(flags & FLAG_CODED){
00559 put_v(bc, (flags^needed_flags) & ~(FLAG_CODED));
00560 flags = needed_flags;
00561 }
00562 if(flags & FLAG_STREAM_ID) put_v(bc, pkt->stream_index);
00563 if(flags & FLAG_CODED_PTS) put_v(bc, coded_pts);
00564 if(flags & FLAG_SIZE_MSB) put_v(bc, pkt->size / fc->size_mul);
00565
00566 if(flags & FLAG_CHECKSUM) put_le32(bc, get_checksum(bc));
00567 else get_checksum(bc);
00568
00569 put_buffer(bc, pkt->data, pkt->size);
00570 nus->last_flags= flags;
00571
00572
00573 if(flags & FLAG_KEY)
00574 av_add_index_entry(
00575 s->streams[pkt->stream_index],
00576 nut->last_syncpoint_pos,
00577 pkt->pts,
00578 0,
00579 0,
00580 AVINDEX_KEYFRAME);
00581
00582 return 0;
00583 }
00584
00585 static int write_trailer(AVFormatContext *s){
00586 NUTContext *nut= s->priv_data;
00587 ByteIOContext *bc= s->pb;
00588
00589 while(nut->header_count<3)
00590 write_headers(nut, bc);
00591 put_flush_packet(bc);
00592
00593 return 0;
00594 }
00595
00596 AVOutputFormat nut_muxer = {
00597 "nut",
00598 "nut format",
00599 "video/x-nut",
00600 "nut",
00601 sizeof(NUTContext),
00602 #ifdef CONFIG_LIBVORBIS
00603 CODEC_ID_VORBIS,
00604 #elif defined(CONFIG_LIBMP3LAME)
00605 CODEC_ID_MP3,
00606 #else
00607 CODEC_ID_MP2,
00608 #endif
00609 CODEC_ID_MPEG4,
00610 write_header,
00611 write_packet,
00612 write_trailer,
00613 .flags = AVFMT_GLOBALHEADER,
00614 .codec_tag= (const AVCodecTag*[]){codec_bmp_tags, codec_wav_tags, 0},
00615 };