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00022 #include "libavutil/intreadwrite.h"
00023 #include "libavutil/tree.h"
00024 #include "libavcodec/mpegaudiodata.h"
00025 #include "nut.h"
00026 #include "internal.h"
00027
00028 static int find_expected_header(AVCodecContext *c, int size, int key_frame, uint8_t out[64]){
00029 int sample_rate= c->sample_rate;
00030
00031 if(size>4096)
00032 return 0;
00033
00034 AV_WB24(out, 1);
00035
00036 if(c->codec_id == CODEC_ID_MPEG4){
00037 if(key_frame){
00038 return 3;
00039 }else{
00040 out[3]= 0xB6;
00041 return 4;
00042 }
00043 }else if(c->codec_id == CODEC_ID_MPEG1VIDEO || c->codec_id == CODEC_ID_MPEG2VIDEO){
00044 return 3;
00045 }else if(c->codec_id == CODEC_ID_H264){
00046 return 3;
00047 }else if(c->codec_id == CODEC_ID_MP3 || c->codec_id == CODEC_ID_MP2){
00048 int lsf, mpeg25, sample_rate_index, bitrate_index, frame_size;
00049 int layer= c->codec_id == CODEC_ID_MP3 ? 3 : 2;
00050 unsigned int header= 0xFFF00000;
00051
00052 lsf = sample_rate < (24000+32000)/2;
00053 mpeg25 = sample_rate < (12000+16000)/2;
00054 sample_rate <<= lsf + mpeg25;
00055 if (sample_rate < (32000 + 44100)/2) sample_rate_index=2;
00056 else if(sample_rate < (44100 + 48000)/2) sample_rate_index=0;
00057 else sample_rate_index=1;
00058
00059 sample_rate= ff_mpa_freq_tab[sample_rate_index] >> (lsf + mpeg25);
00060
00061 for(bitrate_index=2; bitrate_index<30; bitrate_index++){
00062 frame_size = ff_mpa_bitrate_tab[lsf][layer-1][bitrate_index>>1];
00063 frame_size = (frame_size * 144000) / (sample_rate << lsf) + (bitrate_index&1);
00064
00065 if(frame_size == size)
00066 break;
00067 }
00068
00069 header |= (!lsf)<<19;
00070 header |= (4-layer)<<17;
00071 header |= 1<<16;
00072 AV_WB32(out, header);
00073 if(size <= 0)
00074 return 2;
00075 if(bitrate_index == 30)
00076 return -1;
00077
00078 header |= (bitrate_index>>1)<<12;
00079 header |= sample_rate_index<<10;
00080 header |= (bitrate_index&1)<<9;
00081
00082 return 2;
00083 return 3;
00084
00085 }
00086 return 0;
00087 }
00088
00089 static int find_header_idx(AVFormatContext *s, AVCodecContext *c, int size, int frame_type){
00090 NUTContext *nut = s->priv_data;
00091 uint8_t out[64];
00092 int i;
00093 int len= find_expected_header(c, size, frame_type, out);
00094
00095
00096
00097 for(i=1; i<nut->header_count; i++){
00098 if( len == nut->header_len[i]
00099 && !memcmp(out, nut->header[i], len)){
00100
00101 return i;
00102 }
00103 }
00104
00105 return 0;
00106 }
00107
00108 static void build_elision_headers(AVFormatContext *s){
00109 NUTContext *nut = s->priv_data;
00110 int i;
00111
00112
00113 static const uint8_t headers[][5]={
00114 {3, 0x00, 0x00, 0x01},
00115 {4, 0x00, 0x00, 0x01, 0xB6},
00116 {2, 0xFF, 0xFA},
00117 {2, 0xFF, 0xFB},
00118 {2, 0xFF, 0xFC},
00119 {2, 0xFF, 0xFD},
00120 };
00121
00122 nut->header_count= 7;
00123 for(i=1; i<nut->header_count; i++){
00124 nut->header_len[i]= headers[i-1][0];
00125 nut->header [i]= &headers[i-1][1];
00126 }
00127 }
00128
00129 static void build_frame_code(AVFormatContext *s){
00130 NUTContext *nut = s->priv_data;
00131 int key_frame, index, pred, stream_id;
00132 int start=1;
00133 int end= 254;
00134 int keyframe_0_esc= s->nb_streams > 2;
00135 int pred_table[10];
00136 FrameCode *ft;
00137
00138 ft= &nut->frame_code[start];
00139 ft->flags= FLAG_CODED;
00140 ft->size_mul=1;
00141 ft->pts_delta=1;
00142 start++;
00143
00144 if(keyframe_0_esc){
00145
00146 FrameCode *ft= &nut->frame_code[start];
00147 ft->flags= FLAG_STREAM_ID | FLAG_SIZE_MSB | FLAG_CODED_PTS;
00148 ft->size_mul=1;
00149 start++;
00150 }
00151
00152 for(stream_id= 0; stream_id<s->nb_streams; stream_id++){
00153 int start2= start + (end-start)*stream_id / s->nb_streams;
00154 int end2 = start + (end-start)*(stream_id+1) / s->nb_streams;
00155 AVCodecContext *codec = s->streams[stream_id]->codec;
00156 int is_audio= codec->codec_type == AVMEDIA_TYPE_AUDIO;
00157 int intra_only= is_audio;
00158 int pred_count;
00159
00160 for(key_frame=0; key_frame<2; key_frame++){
00161 if(intra_only && keyframe_0_esc && key_frame==0)
00162 continue;
00163
00164 {
00165 FrameCode *ft= &nut->frame_code[start2];
00166 ft->flags= FLAG_KEY*key_frame;
00167 ft->flags|= FLAG_SIZE_MSB | FLAG_CODED_PTS;
00168 ft->stream_id= stream_id;
00169 ft->size_mul=1;
00170 if(is_audio)
00171 ft->header_idx= find_header_idx(s, codec, -1, key_frame);
00172 start2++;
00173 }
00174 }
00175
00176 key_frame= intra_only;
00177 #if 1
00178 if(is_audio){
00179 int frame_bytes= codec->frame_size*(int64_t)codec->bit_rate / (8*codec->sample_rate);
00180 int pts;
00181 for(pts=0; pts<2; pts++){
00182 for(pred=0; pred<2; pred++){
00183 FrameCode *ft= &nut->frame_code[start2];
00184 ft->flags= FLAG_KEY*key_frame;
00185 ft->stream_id= stream_id;
00186 ft->size_mul=frame_bytes + 2;
00187 ft->size_lsb=frame_bytes + pred;
00188 ft->pts_delta=pts;
00189 ft->header_idx= find_header_idx(s, codec, frame_bytes + pred, key_frame);
00190 start2++;
00191 }
00192 }
00193 }else{
00194 FrameCode *ft= &nut->frame_code[start2];
00195 ft->flags= FLAG_KEY | FLAG_SIZE_MSB;
00196 ft->stream_id= stream_id;
00197 ft->size_mul=1;
00198 ft->pts_delta=1;
00199 start2++;
00200 }
00201 #endif
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
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, StreamContext *nus, AVIOContext *bc, uint64_t val){
00245 val *= nut->time_base_count;
00246 val += nus->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
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= url_close_dyn_buf(dyn_bc, &dyn_buf);
00284 int forw_ptr= dyn_size + 4*calculate_checksum;
00285
00286 if(forw_ptr > 4096)
00287 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, get_checksum(bc));
00292
00293 if(calculate_checksum)
00294 init_checksum(bc, ff_crc04C11DB7_update, 0);
00295 avio_write(bc, dyn_buf, dyn_size);
00296 if(calculate_checksum)
00297 avio_wl32(bc, 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);
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
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
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
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
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 );
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);
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);
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 AVMetadataTag *t = NULL;
00435 AVIOContext *dyn_bc;
00436 uint8_t *dyn_buf=NULL;
00437 int count=0, dyn_size;
00438 int ret = url_open_dyn_buf(&dyn_bc);
00439 if(ret < 0)
00440 return ret;
00441
00442 while ((t = av_metadata_get(s->metadata, "", t, AV_METADATA_IGNORE_SUFFIX)))
00443 count += add_info(dyn_bc, t->key, t->value);
00444
00445 ff_put_v(bc, 0);
00446 ff_put_v(bc, 0);
00447 ff_put_v(bc, 0);
00448 ff_put_v(bc, 0);
00449
00450 ff_put_v(bc, count);
00451
00452 dyn_size= url_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 = url_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 = url_close_dyn_buf(dyn_bc, &dyn_buf);
00473
00474 if (count) {
00475 ff_put_v(bc, stream_id + 1);
00476 ff_put_v(bc, 0);
00477 ff_put_v(bc, 0);
00478 ff_put_v(bc, 0);
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_headers(AVFormatContext *avctx, AVIOContext *bc){
00490 NUTContext *nut = avctx->priv_data;
00491 AVIOContext *dyn_bc;
00492 int i, ret;
00493
00494 ff_metadata_conv_ctx(avctx, ff_nut_metadata_conv, NULL);
00495
00496 ret = url_open_dyn_buf(&dyn_bc);
00497 if(ret < 0)
00498 return ret;
00499 write_mainheader(nut, dyn_bc);
00500 put_packet(nut, bc, dyn_bc, 1, MAIN_STARTCODE);
00501
00502 for (i=0; i < nut->avf->nb_streams; i++){
00503 ret = url_open_dyn_buf(&dyn_bc);
00504 if(ret < 0)
00505 return ret;
00506 if ((ret = write_streamheader(avctx, dyn_bc, nut->avf->streams[i], i)) < 0)
00507 return ret;
00508 put_packet(nut, bc, dyn_bc, 1, STREAM_STARTCODE);
00509 }
00510
00511 ret = url_open_dyn_buf(&dyn_bc);
00512 if(ret < 0)
00513 return ret;
00514 write_globalinfo(nut, dyn_bc);
00515 put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
00516
00517 for (i = 0; i < nut->avf->nb_streams; i++) {
00518 ret = url_open_dyn_buf(&dyn_bc);
00519 if(ret < 0)
00520 return ret;
00521 ret = write_streaminfo(nut, dyn_bc, i);
00522 if (ret < 0)
00523 return ret;
00524 if (ret > 0)
00525 put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
00526 else {
00527 uint8_t* buf;
00528 url_close_dyn_buf(dyn_bc, &buf);
00529 av_free(buf);
00530 }
00531 }
00532
00533 nut->last_syncpoint_pos= INT_MIN;
00534 nut->header_count++;
00535 return 0;
00536 }
00537
00538 static int write_header(AVFormatContext *s){
00539 NUTContext *nut = s->priv_data;
00540 AVIOContext *bc = s->pb;
00541 int i, j, ret;
00542
00543 nut->avf= s;
00544
00545 nut->stream = av_mallocz(sizeof(StreamContext)*s->nb_streams);
00546 nut->time_base= av_mallocz(sizeof(AVRational )*s->nb_streams);
00547
00548 for(i=0; i<s->nb_streams; i++){
00549 AVStream *st= s->streams[i];
00550 int ssize;
00551 AVRational time_base;
00552 ff_parse_specific_params(st->codec, &time_base.den, &ssize, &time_base.num);
00553
00554 av_set_pts_info(st, 64, time_base.num, time_base.den);
00555
00556 for(j=0; j<nut->time_base_count; j++){
00557 if(!memcmp(&time_base, &nut->time_base[j], sizeof(AVRational))){
00558 break;
00559 }
00560 }
00561 nut->time_base[j]= time_base;
00562 nut->stream[i].time_base= &nut->time_base[j];
00563 if(j==nut->time_base_count)
00564 nut->time_base_count++;
00565
00566 if(INT64_C(1000) * time_base.num >= time_base.den)
00567 nut->stream[i].msb_pts_shift = 7;
00568 else
00569 nut->stream[i].msb_pts_shift = 14;
00570 nut->stream[i].max_pts_distance= FFMAX(time_base.den, time_base.num) / time_base.num;
00571 }
00572
00573 nut->max_distance = MAX_DISTANCE;
00574 build_elision_headers(s);
00575 build_frame_code(s);
00576 assert(nut->frame_code['N'].flags == FLAG_INVALID);
00577
00578 avio_write(bc, ID_STRING, strlen(ID_STRING));
00579 avio_w8(bc, 0);
00580
00581 if ((ret = write_headers(s, bc)) < 0)
00582 return ret;
00583
00584 put_flush_packet(bc);
00585
00586
00587
00588 return 0;
00589 }
00590
00591 static int get_needed_flags(NUTContext *nut, StreamContext *nus, FrameCode *fc, AVPacket *pkt){
00592 int flags= 0;
00593
00594 if(pkt->flags & AV_PKT_FLAG_KEY ) flags |= FLAG_KEY;
00595 if(pkt->stream_index != fc->stream_id ) flags |= FLAG_STREAM_ID;
00596 if(pkt->size / fc->size_mul ) flags |= FLAG_SIZE_MSB;
00597 if(pkt->pts - nus->last_pts != fc->pts_delta) flags |= FLAG_CODED_PTS;
00598 if(pkt->size > 2*nut->max_distance ) flags |= FLAG_CHECKSUM;
00599 if(FFABS(pkt->pts - nus->last_pts)
00600 > nus->max_pts_distance) flags |= FLAG_CHECKSUM;
00601 if( pkt->size < nut->header_len[fc->header_idx]
00602 || (pkt->size > 4096 && fc->header_idx)
00603 || memcmp(pkt->data, nut->header[fc->header_idx], nut->header_len[fc->header_idx]))
00604 flags |= FLAG_HEADER_IDX;
00605
00606 return flags | (fc->flags & FLAG_CODED);
00607 }
00608
00609 static int find_best_header_idx(NUTContext *nut, AVPacket *pkt){
00610 int i;
00611 int best_i = 0;
00612 int best_len= 0;
00613
00614 if(pkt->size > 4096)
00615 return 0;
00616
00617 for(i=1; i<nut->header_count; i++){
00618 if( pkt->size >= nut->header_len[i]
00619 && nut->header_len[i] > best_len
00620 && !memcmp(pkt->data, nut->header[i], nut->header_len[i])){
00621 best_i= i;
00622 best_len= nut->header_len[i];
00623 }
00624 }
00625 return best_i;
00626 }
00627
00628 static int write_packet(AVFormatContext *s, AVPacket *pkt){
00629 NUTContext *nut = s->priv_data;
00630 StreamContext *nus= &nut->stream[pkt->stream_index];
00631 AVIOContext *bc = s->pb, *dyn_bc;
00632 FrameCode *fc;
00633 int64_t coded_pts;
00634 int best_length, frame_code, flags, needed_flags, i, header_idx, best_header_idx;
00635 int key_frame = !!(pkt->flags & AV_PKT_FLAG_KEY);
00636 int store_sp=0;
00637 int ret;
00638
00639 if(pkt->pts < 0)
00640 return -1;
00641
00642 if(1LL<<(20+3*nut->header_count) <= avio_tell(bc))
00643 write_headers(s, bc);
00644
00645 if(key_frame && !(nus->last_flags & FLAG_KEY))
00646 store_sp= 1;
00647
00648 if(pkt->size + 30 + avio_tell(bc) >= nut->last_syncpoint_pos + nut->max_distance)
00649 store_sp= 1;
00650
00651
00652
00653 if(store_sp){
00654 Syncpoint *sp, dummy= {.pos= INT64_MAX};
00655
00656 ff_nut_reset_ts(nut, *nus->time_base, pkt->dts);
00657 for(i=0; i<s->nb_streams; i++){
00658 AVStream *st= s->streams[i];
00659 int64_t dts_tb = av_rescale_rnd(pkt->dts,
00660 nus->time_base->num * (int64_t)nut->stream[i].time_base->den,
00661 nus->time_base->den * (int64_t)nut->stream[i].time_base->num,
00662 AV_ROUND_DOWN);
00663 int index= av_index_search_timestamp(st, dts_tb, AVSEEK_FLAG_BACKWARD);
00664 if(index>=0) dummy.pos= FFMIN(dummy.pos, st->index_entries[index].pos);
00665 }
00666 if(dummy.pos == INT64_MAX)
00667 dummy.pos= 0;
00668 sp= av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp,
00669 NULL);
00670
00671 nut->last_syncpoint_pos= avio_tell(bc);
00672 ret = url_open_dyn_buf(&dyn_bc);
00673 if(ret < 0)
00674 return ret;
00675 put_tt(nut, nus, dyn_bc, pkt->dts);
00676 ff_put_v(dyn_bc, sp ? (nut->last_syncpoint_pos - sp->pos)>>4 : 0);
00677 put_packet(nut, bc, dyn_bc, 1, SYNCPOINT_STARTCODE);
00678
00679 ff_nut_add_sp(nut, nut->last_syncpoint_pos, 0, pkt->dts);
00680 }
00681 assert(nus->last_pts != AV_NOPTS_VALUE);
00682
00683 coded_pts = pkt->pts & ((1<<nus->msb_pts_shift)-1);
00684 if(ff_lsb2full(nus, coded_pts) != pkt->pts)
00685 coded_pts= pkt->pts + (1<<nus->msb_pts_shift);
00686
00687 best_header_idx= find_best_header_idx(nut, pkt);
00688
00689 best_length=INT_MAX;
00690 frame_code= -1;
00691 for(i=0; i<256; i++){
00692 int length= 0;
00693 FrameCode *fc= &nut->frame_code[i];
00694 int flags= fc->flags;
00695
00696 if(flags & FLAG_INVALID)
00697 continue;
00698 needed_flags= get_needed_flags(nut, nus, fc, pkt);
00699
00700 if(flags & FLAG_CODED){
00701 length++;
00702 flags = needed_flags;
00703 }
00704
00705 if((flags & needed_flags) != needed_flags)
00706 continue;
00707
00708 if((flags ^ needed_flags) & FLAG_KEY)
00709 continue;
00710
00711 if(flags & FLAG_STREAM_ID)
00712 length+= ff_get_v_length(pkt->stream_index);
00713
00714 if(pkt->size % fc->size_mul != fc->size_lsb)
00715 continue;
00716 if(flags & FLAG_SIZE_MSB)
00717 length += ff_get_v_length(pkt->size / fc->size_mul);
00718
00719 if(flags & FLAG_CHECKSUM)
00720 length+=4;
00721
00722 if(flags & FLAG_CODED_PTS)
00723 length += ff_get_v_length(coded_pts);
00724
00725 if( (flags & FLAG_CODED)
00726 && nut->header_len[best_header_idx] > nut->header_len[fc->header_idx]+1){
00727 flags |= FLAG_HEADER_IDX;
00728 }
00729
00730 if(flags & FLAG_HEADER_IDX){
00731 length += 1 - nut->header_len[best_header_idx];
00732 }else{
00733 length -= nut->header_len[fc->header_idx];
00734 }
00735
00736 length*=4;
00737 length+= !(flags & FLAG_CODED_PTS);
00738 length+= !(flags & FLAG_CHECKSUM);
00739
00740 if(length < best_length){
00741 best_length= length;
00742 frame_code=i;
00743 }
00744 }
00745 assert(frame_code != -1);
00746 fc= &nut->frame_code[frame_code];
00747 flags= fc->flags;
00748 needed_flags= get_needed_flags(nut, nus, fc, pkt);
00749 header_idx= fc->header_idx;
00750
00751 init_checksum(bc, ff_crc04C11DB7_update, 0);
00752 avio_w8(bc, frame_code);
00753 if(flags & FLAG_CODED){
00754 ff_put_v(bc, (flags^needed_flags) & ~(FLAG_CODED));
00755 flags = needed_flags;
00756 }
00757 if(flags & FLAG_STREAM_ID) ff_put_v(bc, pkt->stream_index);
00758 if(flags & FLAG_CODED_PTS) ff_put_v(bc, coded_pts);
00759 if(flags & FLAG_SIZE_MSB) ff_put_v(bc, pkt->size / fc->size_mul);
00760 if(flags & FLAG_HEADER_IDX) ff_put_v(bc, header_idx= best_header_idx);
00761
00762 if(flags & FLAG_CHECKSUM) avio_wl32(bc, get_checksum(bc));
00763 else get_checksum(bc);
00764
00765 avio_write(bc, pkt->data + nut->header_len[header_idx], pkt->size - nut->header_len[header_idx]);
00766 nus->last_flags= flags;
00767 nus->last_pts= pkt->pts;
00768
00769
00770 if(flags & FLAG_KEY)
00771 av_add_index_entry(
00772 s->streams[pkt->stream_index],
00773 nut->last_syncpoint_pos,
00774 pkt->pts,
00775 0,
00776 0,
00777 AVINDEX_KEYFRAME);
00778
00779 return 0;
00780 }
00781
00782 static int write_trailer(AVFormatContext *s){
00783 NUTContext *nut= s->priv_data;
00784 AVIOContext *bc= s->pb;
00785
00786 while(nut->header_count<3)
00787 write_headers(s, bc);
00788 put_flush_packet(bc);
00789 ff_nut_free_sp(nut);
00790 av_freep(&nut->stream);
00791 av_freep(&nut->time_base);
00792
00793 return 0;
00794 }
00795
00796 AVOutputFormat ff_nut_muxer = {
00797 "nut",
00798 NULL_IF_CONFIG_SMALL("NUT format"),
00799 "video/x-nut",
00800 "nut",
00801 sizeof(NUTContext),
00802 #if CONFIG_LIBVORBIS
00803 CODEC_ID_VORBIS,
00804 #elif CONFIG_LIBMP3LAME
00805 CODEC_ID_MP3,
00806 #else
00807 CODEC_ID_MP2,
00808 #endif
00809 CODEC_ID_MPEG4,
00810 write_header,
00811 write_packet,
00812 write_trailer,
00813 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS,
00814 .codec_tag = (const AVCodecTag * const []){ ff_codec_bmp_tags, ff_nut_video_tags, ff_codec_wav_tags, ff_nut_subtitle_tags, 0 },
00815 };