3 * Copyright (c) 2004-2007 Michael Niedermayer
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/intreadwrite.h"
23 #include "libavutil/tree.h"
24 #include "libavutil/dict.h"
25 #include "libavcodec/mpegaudiodata.h"
28 #include "avio_internal.h"
30 static int find_expected_header(AVCodecContext *c, int size, int key_frame, uint8_t out[64]){
31 int sample_rate= c->sample_rate;
38 if(c->codec_id == CODEC_ID_MPEG4){
45 }else if(c->codec_id == CODEC_ID_MPEG1VIDEO || c->codec_id == CODEC_ID_MPEG2VIDEO){
47 }else if(c->codec_id == CODEC_ID_H264){
49 }else if(c->codec_id == CODEC_ID_MP3 || c->codec_id == CODEC_ID_MP2){
50 int lsf, mpeg25, sample_rate_index, bitrate_index, frame_size;
51 int layer= c->codec_id == CODEC_ID_MP3 ? 3 : 2;
52 unsigned int header= 0xFFF00000;
54 lsf = sample_rate < (24000+32000)/2;
55 mpeg25 = sample_rate < (12000+16000)/2;
56 sample_rate <<= lsf + mpeg25;
57 if (sample_rate < (32000 + 44100)/2) sample_rate_index=2;
58 else if(sample_rate < (44100 + 48000)/2) sample_rate_index=0;
59 else sample_rate_index=1;
61 sample_rate= ff_mpa_freq_tab[sample_rate_index] >> (lsf + mpeg25);
63 for(bitrate_index=2; bitrate_index<30; bitrate_index++){
64 frame_size = ff_mpa_bitrate_tab[lsf][layer-1][bitrate_index>>1];
65 frame_size = (frame_size * 144000) / (sample_rate << lsf) + (bitrate_index&1);
67 if(frame_size == size)
72 header |= (4-layer)<<17;
73 header |= 1<<16; //no crc
76 return 2; //we guess there is no crc, if there is one the user clearly does not care about overhead
77 if(bitrate_index == 30)
78 return -1; //something is wrong ...
80 header |= (bitrate_index>>1)<<12;
81 header |= sample_rate_index<<10;
82 header |= (bitrate_index&1)<<9;
84 return 2; //FIXME actually put the needed ones in build_elision_headers()
85 return 3; //we guess that the private bit is not set
86 //FIXME the above assumptions should be checked, if these turn out false too often something should be done
91 static int find_header_idx(AVFormatContext *s, AVCodecContext *c, int size, int frame_type){
92 NUTContext *nut = s->priv_data;
95 int len= find_expected_header(c, size, frame_type, out);
97 //av_log(NULL, AV_LOG_ERROR, "expected_h len=%d size=%d codec_id=%d\n", len, size, c->codec_id);
99 for(i=1; i<nut->header_count; i++){
100 if( len == nut->header_len[i]
101 && !memcmp(out, nut->header[i], len)){
102 // av_log(NULL, AV_LOG_ERROR, "found %d\n", i);
106 // av_log(NULL, AV_LOG_ERROR, "nothing found\n");
110 static void build_elision_headers(AVFormatContext *s){
111 NUTContext *nut = s->priv_data;
114 //FIXME write a 2pass mode to find the maximal headers
115 static const uint8_t headers[][5]={
116 {3, 0x00, 0x00, 0x01},
117 {4, 0x00, 0x00, 0x01, 0xB6},
118 {2, 0xFF, 0xFA}, //mp3+crc
119 {2, 0xFF, 0xFB}, //mp3
120 {2, 0xFF, 0xFC}, //mp2+crc
121 {2, 0xFF, 0xFD}, //mp2
124 nut->header_count= 7;
125 for(i=1; i<nut->header_count; i++){
126 nut->header_len[i]= headers[i-1][0];
127 nut->header [i]= &headers[i-1][1];
131 static void build_frame_code(AVFormatContext *s){
132 NUTContext *nut = s->priv_data;
133 int key_frame, index, pred, stream_id;
136 int keyframe_0_esc= s->nb_streams > 2;
140 ft= &nut->frame_code[start];
141 ft->flags= FLAG_CODED;
147 /* keyframe = 0 escape */
148 FrameCode *ft= &nut->frame_code[start];
149 ft->flags= FLAG_STREAM_ID | FLAG_SIZE_MSB | FLAG_CODED_PTS;
154 for(stream_id= 0; stream_id<s->nb_streams; stream_id++){
155 int start2= start + (end-start)*stream_id / s->nb_streams;
156 int end2 = start + (end-start)*(stream_id+1) / s->nb_streams;
157 AVCodecContext *codec = s->streams[stream_id]->codec;
158 int is_audio= codec->codec_type == AVMEDIA_TYPE_AUDIO;
159 int intra_only= /*codec->intra_only || */is_audio;
162 for(key_frame=0; key_frame<2; key_frame++){
163 if(intra_only && keyframe_0_esc && key_frame==0)
167 FrameCode *ft= &nut->frame_code[start2];
168 ft->flags= FLAG_KEY*key_frame;
169 ft->flags|= FLAG_SIZE_MSB | FLAG_CODED_PTS;
170 ft->stream_id= stream_id;
173 ft->header_idx= find_header_idx(s, codec, -1, key_frame);
178 key_frame= intra_only;
181 int frame_bytes= codec->frame_size*(int64_t)codec->bit_rate / (8*codec->sample_rate);
183 for(pts=0; pts<2; pts++){
184 for(pred=0; pred<2; pred++){
185 FrameCode *ft= &nut->frame_code[start2];
186 ft->flags= FLAG_KEY*key_frame;
187 ft->stream_id= stream_id;
188 ft->size_mul=frame_bytes + 2;
189 ft->size_lsb=frame_bytes + pred;
191 ft->header_idx= find_header_idx(s, codec, frame_bytes + pred, key_frame);
196 FrameCode *ft= &nut->frame_code[start2];
197 ft->flags= FLAG_KEY | FLAG_SIZE_MSB;
198 ft->stream_id= stream_id;
205 if(codec->has_b_frames){
212 }else if(codec->codec_id == CODEC_ID_VORBIS){
222 for(pred=0; pred<pred_count; pred++){
223 int start3= start2 + (end2-start2)*pred / pred_count;
224 int end3 = start2 + (end2-start2)*(pred+1) / pred_count;
226 for(index=start3; index<end3; index++){
227 FrameCode *ft= &nut->frame_code[index];
228 ft->flags= FLAG_KEY*key_frame;
229 ft->flags|= FLAG_SIZE_MSB;
230 ft->stream_id= stream_id;
231 //FIXME use single byte size and pred from last
232 ft->size_mul= end3-start3;
233 ft->size_lsb= index - start3;
234 ft->pts_delta= pred_table[pred];
236 ft->header_idx= find_header_idx(s, codec, -1, key_frame);
240 memmove(&nut->frame_code['N'+1], &nut->frame_code['N'], sizeof(FrameCode)*(255-'N'));
241 nut->frame_code[ 0].flags=
242 nut->frame_code[255].flags=
243 nut->frame_code['N'].flags= FLAG_INVALID;
246 static void put_tt(NUTContext *nut, AVRational *time_base, AVIOContext *bc, uint64_t val){
247 val *= nut->time_base_count;
248 val += time_base - nut->time_base;
253 * Store a string as vb.
255 static void put_str(AVIOContext *bc, const char *string){
256 int len= strlen(string);
259 avio_write(bc, string, len);
262 static void put_s(AVIOContext *bc, int64_t val){
263 ff_put_v(bc, 2*FFABS(val) - (val>0));
267 static inline void ff_put_v_trace(AVIOContext *bc, uint64_t v, char *file, char *func, int line){
268 av_log(NULL, AV_LOG_DEBUG, "ff_put_v %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
273 static inline void put_s_trace(AVIOContext *bc, int64_t v, char *file, char *func, int line){
274 av_log(NULL, AV_LOG_DEBUG, "put_s %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
278 #define ff_put_v(bc, v) ff_put_v_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
279 #define put_s(bc, v) put_s_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
282 //FIXME remove calculate_checksum
283 static void put_packet(NUTContext *nut, AVIOContext *bc, AVIOContext *dyn_bc, int calculate_checksum, uint64_t startcode){
284 uint8_t *dyn_buf=NULL;
285 int dyn_size= avio_close_dyn_buf(dyn_bc, &dyn_buf);
286 int forw_ptr= dyn_size + 4*calculate_checksum;
289 ffio_init_checksum(bc, ff_crc04C11DB7_update, 0);
290 avio_wb64(bc, startcode);
291 ff_put_v(bc, forw_ptr);
293 avio_wl32(bc, ffio_get_checksum(bc));
295 if(calculate_checksum)
296 ffio_init_checksum(bc, ff_crc04C11DB7_update, 0);
297 avio_write(bc, dyn_buf, dyn_size);
298 if(calculate_checksum)
299 avio_wl32(bc, ffio_get_checksum(bc));
304 static void write_mainheader(NUTContext *nut, AVIOContext *bc){
305 int i, j, tmp_pts, tmp_flags, tmp_stream, tmp_mul, tmp_size, tmp_fields, tmp_head_idx;
308 ff_put_v(bc, 3); /* version */
309 ff_put_v(bc, nut->avf->nb_streams);
310 ff_put_v(bc, nut->max_distance);
311 ff_put_v(bc, nut->time_base_count);
313 for(i=0; i<nut->time_base_count; i++){
314 ff_put_v(bc, nut->time_base[i].num);
315 ff_put_v(bc, nut->time_base[i].den);
321 tmp_match= 1-(1LL<<62);
327 if(tmp_pts != nut->frame_code[i].pts_delta) tmp_fields=1;
328 if(tmp_mul != nut->frame_code[i].size_mul ) tmp_fields=2;
329 if(tmp_stream != nut->frame_code[i].stream_id) tmp_fields=3;
330 if(tmp_size != nut->frame_code[i].size_lsb ) tmp_fields=4;
331 // if(tmp_res != nut->frame_code[i].res ) tmp_fields=5;
332 if(tmp_head_idx!=nut->frame_code[i].header_idx)tmp_fields=8;
334 tmp_pts = nut->frame_code[i].pts_delta;
335 tmp_flags = nut->frame_code[i].flags;
336 tmp_stream= nut->frame_code[i].stream_id;
337 tmp_mul = nut->frame_code[i].size_mul;
338 tmp_size = nut->frame_code[i].size_lsb;
339 // tmp_res = nut->frame_code[i].res;
340 tmp_head_idx= nut->frame_code[i].header_idx;
342 for(j=0; i<256; j++,i++){
347 if(nut->frame_code[i].pts_delta != tmp_pts ) break;
348 if(nut->frame_code[i].flags != tmp_flags ) break;
349 if(nut->frame_code[i].stream_id != tmp_stream) break;
350 if(nut->frame_code[i].size_mul != tmp_mul ) break;
351 if(nut->frame_code[i].size_lsb != tmp_size+j) break;
352 // if(nut->frame_code[i].res != tmp_res ) break;
353 if(nut->frame_code[i].header_idx!= tmp_head_idx) break;
355 if(j != tmp_mul - tmp_size) tmp_fields=6;
357 ff_put_v(bc, tmp_flags);
358 ff_put_v(bc, tmp_fields);
359 if(tmp_fields>0) put_s(bc, tmp_pts);
360 if(tmp_fields>1) ff_put_v(bc, tmp_mul);
361 if(tmp_fields>2) ff_put_v(bc, tmp_stream);
362 if(tmp_fields>3) ff_put_v(bc, tmp_size);
363 if(tmp_fields>4) ff_put_v(bc, 0 /*tmp_res*/);
364 if(tmp_fields>5) ff_put_v(bc, j);
365 if(tmp_fields>6) ff_put_v(bc, tmp_match);
366 if(tmp_fields>7) ff_put_v(bc, tmp_head_idx);
368 ff_put_v(bc, nut->header_count-1);
369 for(i=1; i<nut->header_count; i++){
370 ff_put_v(bc, nut->header_len[i]);
371 avio_write(bc, nut->header[i], nut->header_len[i]);
375 static int write_streamheader(AVFormatContext *avctx, AVIOContext *bc, AVStream *st, int i){
376 NUTContext *nut = avctx->priv_data;
377 AVCodecContext *codec = st->codec;
379 switch(codec->codec_type){
380 case AVMEDIA_TYPE_VIDEO: ff_put_v(bc, 0); break;
381 case AVMEDIA_TYPE_AUDIO: ff_put_v(bc, 1); break;
382 case AVMEDIA_TYPE_SUBTITLE: ff_put_v(bc, 2); break;
383 default : ff_put_v(bc, 3); break;
386 if (codec->codec_tag){
387 avio_wl32(bc, codec->codec_tag);
389 av_log(avctx, AV_LOG_ERROR, "No codec tag defined for stream %d\n", i);
390 return AVERROR(EINVAL);
393 ff_put_v(bc, nut->stream[i].time_base - nut->time_base);
394 ff_put_v(bc, nut->stream[i].msb_pts_shift);
395 ff_put_v(bc, nut->stream[i].max_pts_distance);
396 ff_put_v(bc, codec->has_b_frames);
397 avio_w8(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */
399 ff_put_v(bc, codec->extradata_size);
400 avio_write(bc, codec->extradata, codec->extradata_size);
402 switch(codec->codec_type){
403 case AVMEDIA_TYPE_AUDIO:
404 ff_put_v(bc, codec->sample_rate);
406 ff_put_v(bc, codec->channels);
408 case AVMEDIA_TYPE_VIDEO:
409 ff_put_v(bc, codec->width);
410 ff_put_v(bc, codec->height);
412 if(st->sample_aspect_ratio.num<=0 || st->sample_aspect_ratio.den<=0){
416 ff_put_v(bc, st->sample_aspect_ratio.num);
417 ff_put_v(bc, st->sample_aspect_ratio.den);
419 ff_put_v(bc, 0); /* csp type -- unknown */
427 static int add_info(AVIOContext *bc, const char *type, const char *value){
434 static int write_globalinfo(NUTContext *nut, AVIOContext *bc){
435 AVFormatContext *s= nut->avf;
436 AVDictionaryEntry *t = NULL;
438 uint8_t *dyn_buf=NULL;
439 int count=0, dyn_size;
440 int ret = avio_open_dyn_buf(&dyn_bc);
444 while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX)))
445 count += add_info(dyn_bc, t->key, t->value);
447 ff_put_v(bc, 0); //stream_if_plus1
448 ff_put_v(bc, 0); //chapter_id
449 ff_put_v(bc, 0); //timestamp_start
450 ff_put_v(bc, 0); //length
454 dyn_size= avio_close_dyn_buf(dyn_bc, &dyn_buf);
455 avio_write(bc, dyn_buf, dyn_size);
460 static int write_streaminfo(NUTContext *nut, AVIOContext *bc, int stream_id){
461 AVFormatContext *s= nut->avf;
462 AVStream* st = s->streams[stream_id];
464 uint8_t *dyn_buf=NULL;
465 int count=0, dyn_size, i;
466 int ret = avio_open_dyn_buf(&dyn_bc);
470 for (i=0; ff_nut_dispositions[i].flag; ++i) {
471 if (st->disposition & ff_nut_dispositions[i].flag)
472 count += add_info(dyn_bc, "Disposition", ff_nut_dispositions[i].str);
474 dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf);
477 ff_put_v(bc, stream_id + 1); //stream_id_plus1
478 ff_put_v(bc, 0); //chapter_id
479 ff_put_v(bc, 0); //timestamp_start
480 ff_put_v(bc, 0); //length
484 avio_write(bc, dyn_buf, dyn_size);
491 static int write_chapter(NUTContext *nut, AVIOContext *bc, int id)
494 uint8_t *dyn_buf = NULL;
495 AVDictionaryEntry *t = NULL;
496 AVChapter *ch = nut->avf->chapters[id];
497 int ret, dyn_size, count = 0;
499 ret = avio_open_dyn_buf(&dyn_bc);
503 ff_put_v(bc, 0); // stream_id_plus1
504 put_s(bc, id + 1); // chapter_id
505 put_tt(nut, nut->chapter[id].time_base, bc, ch->start); // chapter_start
506 ff_put_v(bc, ch->end - ch->start); // chapter_len
508 while ((t = av_dict_get(ch->metadata, "", t, AV_DICT_IGNORE_SUFFIX)))
509 count += add_info(dyn_bc, t->key, t->value);
513 dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf);
514 avio_write(bc, dyn_buf, dyn_size);
519 static int write_headers(AVFormatContext *avctx, AVIOContext *bc){
520 NUTContext *nut = avctx->priv_data;
524 ff_metadata_conv_ctx(avctx, ff_nut_metadata_conv, NULL);
526 ret = avio_open_dyn_buf(&dyn_bc);
529 write_mainheader(nut, dyn_bc);
530 put_packet(nut, bc, dyn_bc, 1, MAIN_STARTCODE);
532 for (i=0; i < nut->avf->nb_streams; i++){
533 ret = avio_open_dyn_buf(&dyn_bc);
536 if ((ret = write_streamheader(avctx, dyn_bc, nut->avf->streams[i], i)) < 0)
538 put_packet(nut, bc, dyn_bc, 1, STREAM_STARTCODE);
541 ret = avio_open_dyn_buf(&dyn_bc);
544 write_globalinfo(nut, dyn_bc);
545 put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
547 for (i = 0; i < nut->avf->nb_streams; i++) {
548 ret = avio_open_dyn_buf(&dyn_bc);
551 ret = write_streaminfo(nut, dyn_bc, i);
555 put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
558 avio_close_dyn_buf(dyn_bc, &buf);
563 for (i = 0; i < nut->avf->nb_chapters; i++) {
564 ret = avio_open_dyn_buf(&dyn_bc);
567 ret = write_chapter(nut, dyn_bc, i);
570 avio_close_dyn_buf(dyn_bc, &buf);
574 put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
577 nut->last_syncpoint_pos= INT_MIN;
582 static int write_header(AVFormatContext *s){
583 NUTContext *nut = s->priv_data;
584 AVIOContext *bc = s->pb;
589 nut->stream = av_mallocz(sizeof(StreamContext)*s->nb_streams);
590 nut->chapter = av_mallocz(sizeof(ChapterContext)*s->nb_chapters);
591 nut->time_base= av_mallocz(sizeof(AVRational )*(s->nb_streams +
593 if (!nut->stream || !nut->chapter || !nut->time_base) {
594 av_freep(&nut->stream);
595 av_freep(&nut->chapter);
596 av_freep(&nut->time_base);
597 return AVERROR(ENOMEM);
600 for(i=0; i<s->nb_streams; i++){
601 AVStream *st= s->streams[i];
603 AVRational time_base;
604 ff_parse_specific_params(st->codec, &time_base.den, &ssize, &time_base.num);
606 av_set_pts_info(st, 64, time_base.num, time_base.den);
608 for(j=0; j<nut->time_base_count; j++){
609 if(!memcmp(&time_base, &nut->time_base[j], sizeof(AVRational))){
613 nut->time_base[j]= time_base;
614 nut->stream[i].time_base= &nut->time_base[j];
615 if(j==nut->time_base_count)
616 nut->time_base_count++;
618 if(INT64_C(1000) * time_base.num >= time_base.den)
619 nut->stream[i].msb_pts_shift = 7;
621 nut->stream[i].msb_pts_shift = 14;
622 nut->stream[i].max_pts_distance= FFMAX(time_base.den, time_base.num) / time_base.num;
625 for (i = 0; i < s->nb_chapters; i++) {
626 AVChapter *ch = s->chapters[i];
628 for (j = 0; j < nut->time_base_count; j++) {
629 if (!memcmp(&ch->time_base, &nut->time_base[j], sizeof(AVRational)))
633 nut->time_base[j] = ch->time_base;
634 nut->chapter[i].time_base = &nut->time_base[j];
635 if(j == nut->time_base_count)
636 nut->time_base_count++;
639 nut->max_distance = MAX_DISTANCE;
640 build_elision_headers(s);
642 assert(nut->frame_code['N'].flags == FLAG_INVALID);
644 avio_write(bc, ID_STRING, strlen(ID_STRING));
647 if ((ret = write_headers(s, bc)) < 0)
657 static int get_needed_flags(NUTContext *nut, StreamContext *nus, FrameCode *fc, AVPacket *pkt){
660 if(pkt->flags & AV_PKT_FLAG_KEY ) flags |= FLAG_KEY;
661 if(pkt->stream_index != fc->stream_id ) flags |= FLAG_STREAM_ID;
662 if(pkt->size / fc->size_mul ) flags |= FLAG_SIZE_MSB;
663 if(pkt->pts - nus->last_pts != fc->pts_delta) flags |= FLAG_CODED_PTS;
664 if(pkt->size > 2*nut->max_distance ) flags |= FLAG_CHECKSUM;
665 if(FFABS(pkt->pts - nus->last_pts)
666 > nus->max_pts_distance) flags |= FLAG_CHECKSUM;
667 if( pkt->size < nut->header_len[fc->header_idx]
668 || (pkt->size > 4096 && fc->header_idx)
669 || memcmp(pkt->data, nut->header[fc->header_idx], nut->header_len[fc->header_idx]))
670 flags |= FLAG_HEADER_IDX;
672 return flags | (fc->flags & FLAG_CODED);
675 static int find_best_header_idx(NUTContext *nut, AVPacket *pkt){
683 for(i=1; i<nut->header_count; i++){
684 if( pkt->size >= nut->header_len[i]
685 && nut->header_len[i] > best_len
686 && !memcmp(pkt->data, nut->header[i], nut->header_len[i])){
688 best_len= nut->header_len[i];
694 static int write_packet(AVFormatContext *s, AVPacket *pkt){
695 NUTContext *nut = s->priv_data;
696 StreamContext *nus= &nut->stream[pkt->stream_index];
697 AVIOContext *bc = s->pb, *dyn_bc;
700 int best_length, frame_code, flags, needed_flags, i, header_idx, best_header_idx;
701 int key_frame = !!(pkt->flags & AV_PKT_FLAG_KEY);
708 if(1LL<<(20+3*nut->header_count) <= avio_tell(bc))
709 write_headers(s, bc);
711 if(key_frame && !(nus->last_flags & FLAG_KEY))
714 if(pkt->size + 30/*FIXME check*/ + avio_tell(bc) >= nut->last_syncpoint_pos + nut->max_distance)
717 //FIXME: Ensure store_sp is 1 in the first place.
720 Syncpoint *sp, dummy= {.pos= INT64_MAX};
722 ff_nut_reset_ts(nut, *nus->time_base, pkt->dts);
723 for(i=0; i<s->nb_streams; i++){
724 AVStream *st= s->streams[i];
725 int64_t dts_tb = av_rescale_rnd(pkt->dts,
726 nus->time_base->num * (int64_t)nut->stream[i].time_base->den,
727 nus->time_base->den * (int64_t)nut->stream[i].time_base->num,
729 int index= av_index_search_timestamp(st, dts_tb, AVSEEK_FLAG_BACKWARD);
730 if(index>=0) dummy.pos= FFMIN(dummy.pos, st->index_entries[index].pos);
732 if(dummy.pos == INT64_MAX)
734 sp= av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp,
737 nut->last_syncpoint_pos= avio_tell(bc);
738 ret = avio_open_dyn_buf(&dyn_bc);
741 put_tt(nut, nus->time_base, dyn_bc, pkt->dts);
742 ff_put_v(dyn_bc, sp ? (nut->last_syncpoint_pos - sp->pos)>>4 : 0);
743 put_packet(nut, bc, dyn_bc, 1, SYNCPOINT_STARTCODE);
745 ff_nut_add_sp(nut, nut->last_syncpoint_pos, 0/*unused*/, pkt->dts);
747 assert(nus->last_pts != AV_NOPTS_VALUE);
749 coded_pts = pkt->pts & ((1<<nus->msb_pts_shift)-1);
750 if(ff_lsb2full(nus, coded_pts) != pkt->pts)
751 coded_pts= pkt->pts + (1<<nus->msb_pts_shift);
753 best_header_idx= find_best_header_idx(nut, pkt);
757 for(i=0; i<256; i++){
759 FrameCode *fc= &nut->frame_code[i];
760 int flags= fc->flags;
762 if(flags & FLAG_INVALID)
764 needed_flags= get_needed_flags(nut, nus, fc, pkt);
766 if(flags & FLAG_CODED){
768 flags = needed_flags;
771 if((flags & needed_flags) != needed_flags)
774 if((flags ^ needed_flags) & FLAG_KEY)
777 if(flags & FLAG_STREAM_ID)
778 length+= ff_get_v_length(pkt->stream_index);
780 if(pkt->size % fc->size_mul != fc->size_lsb)
782 if(flags & FLAG_SIZE_MSB)
783 length += ff_get_v_length(pkt->size / fc->size_mul);
785 if(flags & FLAG_CHECKSUM)
788 if(flags & FLAG_CODED_PTS)
789 length += ff_get_v_length(coded_pts);
791 if( (flags & FLAG_CODED)
792 && nut->header_len[best_header_idx] > nut->header_len[fc->header_idx]+1){
793 flags |= FLAG_HEADER_IDX;
796 if(flags & FLAG_HEADER_IDX){
797 length += 1 - nut->header_len[best_header_idx];
799 length -= nut->header_len[fc->header_idx];
803 length+= !(flags & FLAG_CODED_PTS);
804 length+= !(flags & FLAG_CHECKSUM);
806 if(length < best_length){
811 assert(frame_code != -1);
812 fc= &nut->frame_code[frame_code];
814 needed_flags= get_needed_flags(nut, nus, fc, pkt);
815 header_idx= fc->header_idx;
817 ffio_init_checksum(bc, ff_crc04C11DB7_update, 0);
818 avio_w8(bc, frame_code);
819 if(flags & FLAG_CODED){
820 ff_put_v(bc, (flags^needed_flags) & ~(FLAG_CODED));
821 flags = needed_flags;
823 if(flags & FLAG_STREAM_ID) ff_put_v(bc, pkt->stream_index);
824 if(flags & FLAG_CODED_PTS) ff_put_v(bc, coded_pts);
825 if(flags & FLAG_SIZE_MSB) ff_put_v(bc, pkt->size / fc->size_mul);
826 if(flags & FLAG_HEADER_IDX) ff_put_v(bc, header_idx= best_header_idx);
828 if(flags & FLAG_CHECKSUM) avio_wl32(bc, ffio_get_checksum(bc));
829 else ffio_get_checksum(bc);
831 avio_write(bc, pkt->data + nut->header_len[header_idx], pkt->size - nut->header_len[header_idx]);
832 nus->last_flags= flags;
833 nus->last_pts= pkt->pts;
835 //FIXME just store one per syncpoint
838 s->streams[pkt->stream_index],
839 nut->last_syncpoint_pos,
848 static int write_trailer(AVFormatContext *s){
849 NUTContext *nut= s->priv_data;
850 AVIOContext *bc= s->pb;
852 while(nut->header_count<3)
853 write_headers(s, bc);
856 av_freep(&nut->stream);
857 av_freep(&nut->chapter);
858 av_freep(&nut->time_base);
863 AVOutputFormat ff_nut_muxer = {
865 NULL_IF_CONFIG_SMALL("NUT format"),
871 #elif CONFIG_LIBMP3LAME
880 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS,
881 .codec_tag = (const AVCodecTag * const []){ ff_codec_bmp_tags, ff_nut_video_tags, ff_codec_wav_tags, ff_nut_subtitle_tags, 0 },