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/mathematics.h"
24 #include "libavutil/tree.h"
25 #include "libavutil/dict.h"
26 #include "libavutil/avassert.h"
27 #include "libavcodec/mpegaudiodata.h"
30 #include "avio_internal.h"
32 static int find_expected_header(AVCodecContext *c, int size, int key_frame, uint8_t out[64]){
33 int sample_rate= c->sample_rate;
40 if(c->codec_id == AV_CODEC_ID_MPEG4){
47 }else if(c->codec_id == AV_CODEC_ID_MPEG1VIDEO || c->codec_id == AV_CODEC_ID_MPEG2VIDEO){
49 }else if(c->codec_id == AV_CODEC_ID_H264){
51 }else if(c->codec_id == AV_CODEC_ID_MP3 || c->codec_id == AV_CODEC_ID_MP2){
52 int lsf, mpeg25, sample_rate_index, bitrate_index, frame_size;
53 int layer= c->codec_id == AV_CODEC_ID_MP3 ? 3 : 2;
54 unsigned int header= 0xFFF00000;
56 lsf = sample_rate < (24000+32000)/2;
57 mpeg25 = sample_rate < (12000+16000)/2;
58 sample_rate <<= lsf + mpeg25;
59 if (sample_rate < (32000 + 44100)/2) sample_rate_index=2;
60 else if(sample_rate < (44100 + 48000)/2) sample_rate_index=0;
61 else sample_rate_index=1;
63 sample_rate= avpriv_mpa_freq_tab[sample_rate_index] >> (lsf + mpeg25);
65 for(bitrate_index=2; bitrate_index<30; bitrate_index++){
66 frame_size = avpriv_mpa_bitrate_tab[lsf][layer-1][bitrate_index>>1];
67 frame_size = (frame_size * 144000) / (sample_rate << lsf) + (bitrate_index&1);
69 if(frame_size == size)
74 header |= (4-layer)<<17;
75 header |= 1<<16; //no crc
78 return 2; //we guess there is no crc, if there is one the user clearly does not care about overhead
79 if(bitrate_index == 30)
80 return -1; //something is wrong ...
82 header |= (bitrate_index>>1)<<12;
83 header |= sample_rate_index<<10;
84 header |= (bitrate_index&1)<<9;
86 return 2; //FIXME actually put the needed ones in build_elision_headers()
87 return 3; //we guess that the private bit is not set
88 //FIXME the above assumptions should be checked, if these turn out false too often something should be done
93 static int find_header_idx(AVFormatContext *s, AVCodecContext *c, int size, int frame_type){
94 NUTContext *nut = s->priv_data;
97 int len= find_expected_header(c, size, frame_type, out);
99 for(i=1; i<nut->header_count; i++){
100 if( len == nut->header_len[i]
101 && !memcmp(out, nut->header[i], len)){
108 static void build_elision_headers(AVFormatContext *s){
109 NUTContext *nut = s->priv_data;
112 //FIXME write a 2pass mode to find the maximal headers
113 static const uint8_t headers[][5]={
114 {3, 0x00, 0x00, 0x01},
115 {4, 0x00, 0x00, 0x01, 0xB6},
116 {2, 0xFF, 0xFA}, //mp3+crc
117 {2, 0xFF, 0xFB}, //mp3
118 {2, 0xFF, 0xFC}, //mp2+crc
119 {2, 0xFF, 0xFD}, //mp2
122 nut->header_count= 7;
123 for(i=1; i<nut->header_count; i++){
124 nut->header_len[i]= headers[i-1][0];
125 nut->header [i]= &headers[i-1][1];
129 static void build_frame_code(AVFormatContext *s){
130 NUTContext *nut = s->priv_data;
131 int key_frame, index, pred, stream_id;
134 int keyframe_0_esc= s->nb_streams > 2;
138 ft= &nut->frame_code[start];
139 ft->flags= FLAG_CODED;
145 /* keyframe = 0 escape */
146 FrameCode *ft= &nut->frame_code[start];
147 ft->flags= FLAG_STREAM_ID | FLAG_SIZE_MSB | FLAG_CODED_PTS;
152 for(stream_id= 0; stream_id<s->nb_streams; stream_id++){
153 int start2= start + (end-start)*stream_id / s->nb_streams;
154 int end2 = start + (end-start)*(stream_id+1) / s->nb_streams;
155 AVCodecContext *codec = s->streams[stream_id]->codec;
156 int is_audio= codec->codec_type == AVMEDIA_TYPE_AUDIO;
157 int intra_only= /*codec->intra_only || */is_audio;
161 if (codec->codec_type == AVMEDIA_TYPE_AUDIO) {
162 frame_size = av_get_audio_frame_duration(codec, 0);
163 if (codec->codec_id == AV_CODEC_ID_VORBIS && !frame_size)
166 AVRational f = av_div_q(codec->time_base, *nut->stream[stream_id].time_base);
167 if(f.den == 1 && f.num>0)
173 for(key_frame=0; key_frame<2; key_frame++){
174 if(intra_only && keyframe_0_esc && key_frame==0)
178 FrameCode *ft= &nut->frame_code[start2];
179 ft->flags= FLAG_KEY*key_frame;
180 ft->flags|= FLAG_SIZE_MSB | FLAG_CODED_PTS;
181 ft->stream_id= stream_id;
184 ft->header_idx= find_header_idx(s, codec, -1, key_frame);
189 key_frame= intra_only;
192 int frame_bytes= codec->frame_size*(int64_t)codec->bit_rate / (8*codec->sample_rate);
194 for(pts=0; pts<2; pts++){
195 for(pred=0; pred<2; pred++){
196 FrameCode *ft= &nut->frame_code[start2];
197 ft->flags= FLAG_KEY*key_frame;
198 ft->stream_id= stream_id;
199 ft->size_mul=frame_bytes + 2;
200 ft->size_lsb=frame_bytes + pred;
201 ft->pts_delta=pts * frame_size;
202 ft->header_idx= find_header_idx(s, codec, frame_bytes + pred, key_frame);
207 FrameCode *ft= &nut->frame_code[start2];
208 ft->flags= FLAG_KEY | FLAG_SIZE_MSB;
209 ft->stream_id= stream_id;
211 ft->pts_delta=frame_size;
216 if(codec->has_b_frames){
223 }else if(codec->codec_id == AV_CODEC_ID_VORBIS){
233 for(pred=0; pred<pred_count; pred++){
234 int start3= start2 + (end2-start2)*pred / pred_count;
235 int end3 = start2 + (end2-start2)*(pred+1) / pred_count;
237 pred_table[pred] *= frame_size;
239 for(index=start3; index<end3; index++){
240 FrameCode *ft= &nut->frame_code[index];
241 ft->flags= FLAG_KEY*key_frame;
242 ft->flags|= FLAG_SIZE_MSB;
243 ft->stream_id= stream_id;
244 //FIXME use single byte size and pred from last
245 ft->size_mul= end3-start3;
246 ft->size_lsb= index - start3;
247 ft->pts_delta= pred_table[pred];
249 ft->header_idx= find_header_idx(s, codec, -1, key_frame);
253 memmove(&nut->frame_code['N'+1], &nut->frame_code['N'], sizeof(FrameCode)*(255-'N'));
254 nut->frame_code[ 0].flags=
255 nut->frame_code[255].flags=
256 nut->frame_code['N'].flags= FLAG_INVALID;
259 static void put_tt(NUTContext *nut, AVRational *time_base, AVIOContext *bc, uint64_t val){
260 val *= nut->time_base_count;
261 val += time_base - nut->time_base;
266 * Store a string as vb.
268 static void put_str(AVIOContext *bc, const char *string){
269 int len= strlen(string);
272 avio_write(bc, string, len);
275 static void put_s(AVIOContext *bc, int64_t val){
276 ff_put_v(bc, 2*FFABS(val) - (val>0));
280 static inline void ff_put_v_trace(AVIOContext *bc, uint64_t v, const char *file,
281 const char *func, int line)
283 av_log(NULL, AV_LOG_DEBUG, "ff_put_v %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
288 static inline void put_s_trace(AVIOContext *bc, int64_t v, const char *file,
289 const char *func, int line)
291 av_log(NULL, AV_LOG_DEBUG, "put_s %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
295 #define ff_put_v(bc, v) ff_put_v_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
296 #define put_s(bc, v) put_s_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
299 //FIXME remove calculate_checksum
300 static void put_packet(NUTContext *nut, AVIOContext *bc, AVIOContext *dyn_bc, int calculate_checksum, uint64_t startcode){
301 uint8_t *dyn_buf=NULL;
302 int dyn_size= avio_close_dyn_buf(dyn_bc, &dyn_buf);
303 int forw_ptr= dyn_size + 4*calculate_checksum;
306 ffio_init_checksum(bc, ff_crc04C11DB7_update, 0);
307 avio_wb64(bc, startcode);
308 ff_put_v(bc, forw_ptr);
310 avio_wl32(bc, ffio_get_checksum(bc));
312 if(calculate_checksum)
313 ffio_init_checksum(bc, ff_crc04C11DB7_update, 0);
314 avio_write(bc, dyn_buf, dyn_size);
315 if(calculate_checksum)
316 avio_wl32(bc, ffio_get_checksum(bc));
321 static void write_mainheader(NUTContext *nut, AVIOContext *bc){
322 int i, j, tmp_pts, tmp_flags, tmp_stream, tmp_mul, tmp_size, tmp_fields, tmp_head_idx;
325 ff_put_v(bc, 3); /* version */
326 ff_put_v(bc, nut->avf->nb_streams);
327 ff_put_v(bc, nut->max_distance);
328 ff_put_v(bc, nut->time_base_count);
330 for(i=0; i<nut->time_base_count; i++){
331 ff_put_v(bc, nut->time_base[i].num);
332 ff_put_v(bc, nut->time_base[i].den);
338 tmp_match= 1-(1LL<<62);
344 if(tmp_pts != nut->frame_code[i].pts_delta) tmp_fields=1;
345 if(tmp_mul != nut->frame_code[i].size_mul ) tmp_fields=2;
346 if(tmp_stream != nut->frame_code[i].stream_id) tmp_fields=3;
347 if(tmp_size != nut->frame_code[i].size_lsb ) tmp_fields=4;
348 // if(tmp_res != nut->frame_code[i].res ) tmp_fields=5;
349 if(tmp_head_idx!=nut->frame_code[i].header_idx)tmp_fields=8;
351 tmp_pts = nut->frame_code[i].pts_delta;
352 tmp_flags = nut->frame_code[i].flags;
353 tmp_stream= nut->frame_code[i].stream_id;
354 tmp_mul = nut->frame_code[i].size_mul;
355 tmp_size = nut->frame_code[i].size_lsb;
356 // tmp_res = nut->frame_code[i].res;
357 tmp_head_idx= nut->frame_code[i].header_idx;
359 for(j=0; i<256; j++,i++){
364 if(nut->frame_code[i].pts_delta != tmp_pts ) break;
365 if(nut->frame_code[i].flags != tmp_flags ) break;
366 if(nut->frame_code[i].stream_id != tmp_stream) break;
367 if(nut->frame_code[i].size_mul != tmp_mul ) break;
368 if(nut->frame_code[i].size_lsb != tmp_size+j) break;
369 // if(nut->frame_code[i].res != tmp_res ) break;
370 if(nut->frame_code[i].header_idx!= tmp_head_idx) break;
372 if(j != tmp_mul - tmp_size) tmp_fields=6;
374 ff_put_v(bc, tmp_flags);
375 ff_put_v(bc, tmp_fields);
376 if(tmp_fields>0) put_s(bc, tmp_pts);
377 if(tmp_fields>1) ff_put_v(bc, tmp_mul);
378 if(tmp_fields>2) ff_put_v(bc, tmp_stream);
379 if(tmp_fields>3) ff_put_v(bc, tmp_size);
380 if(tmp_fields>4) ff_put_v(bc, 0 /*tmp_res*/);
381 if(tmp_fields>5) ff_put_v(bc, j);
382 if(tmp_fields>6) ff_put_v(bc, tmp_match);
383 if(tmp_fields>7) ff_put_v(bc, tmp_head_idx);
385 ff_put_v(bc, nut->header_count-1);
386 for(i=1; i<nut->header_count; i++){
387 ff_put_v(bc, nut->header_len[i]);
388 avio_write(bc, nut->header[i], nut->header_len[i]);
392 static int write_streamheader(AVFormatContext *avctx, AVIOContext *bc, AVStream *st, int i){
393 NUTContext *nut = avctx->priv_data;
394 AVCodecContext *codec = st->codec;
396 switch(codec->codec_type){
397 case AVMEDIA_TYPE_VIDEO: ff_put_v(bc, 0); break;
398 case AVMEDIA_TYPE_AUDIO: ff_put_v(bc, 1); break;
399 case AVMEDIA_TYPE_SUBTITLE: ff_put_v(bc, 2); break;
400 default : ff_put_v(bc, 3); break;
403 if (codec->codec_tag){
404 avio_wl32(bc, codec->codec_tag);
406 av_log(avctx, AV_LOG_ERROR, "No codec tag defined for stream %d\n", i);
407 return AVERROR(EINVAL);
410 ff_put_v(bc, nut->stream[i].time_base - nut->time_base);
411 ff_put_v(bc, nut->stream[i].msb_pts_shift);
412 ff_put_v(bc, nut->stream[i].max_pts_distance);
413 ff_put_v(bc, codec->has_b_frames);
414 avio_w8(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */
416 ff_put_v(bc, codec->extradata_size);
417 avio_write(bc, codec->extradata, codec->extradata_size);
419 switch(codec->codec_type){
420 case AVMEDIA_TYPE_AUDIO:
421 ff_put_v(bc, codec->sample_rate);
423 ff_put_v(bc, codec->channels);
425 case AVMEDIA_TYPE_VIDEO:
426 ff_put_v(bc, codec->width);
427 ff_put_v(bc, codec->height);
429 if(st->sample_aspect_ratio.num<=0 || st->sample_aspect_ratio.den<=0){
433 ff_put_v(bc, st->sample_aspect_ratio.num);
434 ff_put_v(bc, st->sample_aspect_ratio.den);
436 ff_put_v(bc, 0); /* csp type -- unknown */
444 static int add_info(AVIOContext *bc, const char *type, const char *value){
451 static int write_globalinfo(NUTContext *nut, AVIOContext *bc){
452 AVFormatContext *s= nut->avf;
453 AVDictionaryEntry *t = NULL;
455 uint8_t *dyn_buf=NULL;
456 int count=0, dyn_size;
457 int ret = avio_open_dyn_buf(&dyn_bc);
461 while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX)))
462 count += add_info(dyn_bc, t->key, t->value);
464 ff_put_v(bc, 0); //stream_if_plus1
465 ff_put_v(bc, 0); //chapter_id
466 ff_put_v(bc, 0); //timestamp_start
467 ff_put_v(bc, 0); //length
471 dyn_size= avio_close_dyn_buf(dyn_bc, &dyn_buf);
472 avio_write(bc, dyn_buf, dyn_size);
477 static int write_streaminfo(NUTContext *nut, AVIOContext *bc, int stream_id){
478 AVFormatContext *s= nut->avf;
479 AVStream* st = s->streams[stream_id];
480 AVDictionaryEntry *t = NULL;
482 uint8_t *dyn_buf=NULL;
483 int count=0, dyn_size, i;
484 int ret = avio_open_dyn_buf(&dyn_bc);
488 while ((t = av_dict_get(st->metadata, "", t, AV_DICT_IGNORE_SUFFIX)))
489 count += add_info(dyn_bc, t->key, t->value);
490 for (i=0; ff_nut_dispositions[i].flag; ++i) {
491 if (st->disposition & ff_nut_dispositions[i].flag)
492 count += add_info(dyn_bc, "Disposition", ff_nut_dispositions[i].str);
494 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
496 snprintf(buf, sizeof(buf), "%d/%d", st->codec->time_base.den, st->codec->time_base.num);
497 count += add_info(dyn_bc, "r_frame_rate", buf);
499 dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf);
502 ff_put_v(bc, stream_id + 1); //stream_id_plus1
503 ff_put_v(bc, 0); //chapter_id
504 ff_put_v(bc, 0); //timestamp_start
505 ff_put_v(bc, 0); //length
509 avio_write(bc, dyn_buf, dyn_size);
516 static int write_chapter(NUTContext *nut, AVIOContext *bc, int id)
519 uint8_t *dyn_buf = NULL;
520 AVDictionaryEntry *t = NULL;
521 AVChapter *ch = nut->avf->chapters[id];
522 int ret, dyn_size, count = 0;
524 ret = avio_open_dyn_buf(&dyn_bc);
528 ff_put_v(bc, 0); // stream_id_plus1
529 put_s(bc, id + 1); // chapter_id
530 put_tt(nut, nut->chapter[id].time_base, bc, ch->start); // chapter_start
531 ff_put_v(bc, ch->end - ch->start); // chapter_len
533 while ((t = av_dict_get(ch->metadata, "", t, AV_DICT_IGNORE_SUFFIX)))
534 count += add_info(dyn_bc, t->key, t->value);
538 dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf);
539 avio_write(bc, dyn_buf, dyn_size);
544 static int write_index(NUTContext *nut, AVIOContext *bc){
546 Syncpoint dummy= { .pos= 0 };
547 Syncpoint *next_node[2] = { NULL };
548 int64_t startpos = avio_tell(bc);
549 int64_t payload_size;
551 put_tt(nut, nut->max_pts_tb, bc, nut->max_pts);
553 ff_put_v(bc, nut->sp_count);
555 for(i=0; i<nut->sp_count; i++){
556 av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp, (void**)next_node);
557 ff_put_v(bc, (next_node[1]->pos >> 4) - (dummy.pos>>4));
558 dummy.pos = next_node[1]->pos;
561 for(i=0; i<nut->avf->nb_streams; i++){
562 StreamContext *nus= &nut->stream[i];
563 int64_t last_pts= -1;
565 for(j=0; j<nut->sp_count; j++){
566 int flag = (nus->keyframe_pts[j] != AV_NOPTS_VALUE) ^ (j+1 == nut->sp_count);
568 for(; j<nut->sp_count && (nus->keyframe_pts[j] != AV_NOPTS_VALUE) == flag; j++)
571 ff_put_v(bc, 1 + 2*flag + 4*n);
572 for(k= j - n; k<=j && k<nut->sp_count; k++) {
573 if(nus->keyframe_pts[k] == AV_NOPTS_VALUE)
575 av_assert0(nus->keyframe_pts[k] > last_pts);
576 ff_put_v(bc, nus->keyframe_pts[k] - last_pts);
577 last_pts = nus->keyframe_pts[k];
582 payload_size = avio_tell(bc) - startpos + 8 + 4;
584 avio_wb64(bc, 8 + payload_size + av_log2(payload_size) / 7 + 1 + 4*(payload_size > 4096));
589 static int write_headers(AVFormatContext *avctx, AVIOContext *bc){
590 NUTContext *nut = avctx->priv_data;
594 ff_metadata_conv_ctx(avctx, ff_nut_metadata_conv, NULL);
596 ret = avio_open_dyn_buf(&dyn_bc);
599 write_mainheader(nut, dyn_bc);
600 put_packet(nut, bc, dyn_bc, 1, MAIN_STARTCODE);
602 for (i=0; i < nut->avf->nb_streams; i++){
603 ret = avio_open_dyn_buf(&dyn_bc);
606 if ((ret = write_streamheader(avctx, dyn_bc, nut->avf->streams[i], i)) < 0)
608 put_packet(nut, bc, dyn_bc, 1, STREAM_STARTCODE);
611 ret = avio_open_dyn_buf(&dyn_bc);
614 write_globalinfo(nut, dyn_bc);
615 put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
617 for (i = 0; i < nut->avf->nb_streams; i++) {
618 ret = avio_open_dyn_buf(&dyn_bc);
621 ret = write_streaminfo(nut, dyn_bc, i);
625 put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
628 avio_close_dyn_buf(dyn_bc, &buf);
633 for (i = 0; i < nut->avf->nb_chapters; i++) {
634 ret = avio_open_dyn_buf(&dyn_bc);
637 ret = write_chapter(nut, dyn_bc, i);
640 avio_close_dyn_buf(dyn_bc, &buf);
644 put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
647 nut->last_syncpoint_pos= INT_MIN;
652 static int nut_write_header(AVFormatContext *s){
653 NUTContext *nut = s->priv_data;
654 AVIOContext *bc = s->pb;
659 nut->stream = av_mallocz(sizeof(StreamContext)*s->nb_streams);
660 nut->chapter = av_mallocz(sizeof(ChapterContext)*s->nb_chapters);
661 nut->time_base= av_mallocz(sizeof(AVRational )*(s->nb_streams +
663 if (!nut->stream || !nut->chapter || !nut->time_base) {
664 av_freep(&nut->stream);
665 av_freep(&nut->chapter);
666 av_freep(&nut->time_base);
667 return AVERROR(ENOMEM);
670 for(i=0; i<s->nb_streams; i++){
671 AVStream *st= s->streams[i];
673 AVRational time_base;
674 ff_parse_specific_params(st->codec, &time_base.den, &ssize, &time_base.num);
676 if(st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->codec->sample_rate) {
677 time_base = (AVRational){1, st->codec->sample_rate};
679 time_base = ff_choose_timebase(s, st, 48000);
682 avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
684 for(j=0; j<nut->time_base_count; j++){
685 if(!memcmp(&time_base, &nut->time_base[j], sizeof(AVRational))){
689 nut->time_base[j]= time_base;
690 nut->stream[i].time_base= &nut->time_base[j];
691 if(j==nut->time_base_count)
692 nut->time_base_count++;
694 if(INT64_C(1000) * time_base.num >= time_base.den)
695 nut->stream[i].msb_pts_shift = 7;
697 nut->stream[i].msb_pts_shift = 14;
698 nut->stream[i].max_pts_distance= FFMAX(time_base.den, time_base.num) / time_base.num;
701 for (i = 0; i < s->nb_chapters; i++) {
702 AVChapter *ch = s->chapters[i];
704 for (j = 0; j < nut->time_base_count; j++) {
705 if (!memcmp(&ch->time_base, &nut->time_base[j], sizeof(AVRational)))
709 nut->time_base[j] = ch->time_base;
710 nut->chapter[i].time_base = &nut->time_base[j];
711 if(j == nut->time_base_count)
712 nut->time_base_count++;
715 nut->max_distance = MAX_DISTANCE;
716 build_elision_headers(s);
718 av_assert0(nut->frame_code['N'].flags == FLAG_INVALID);
720 avio_write(bc, ID_STRING, strlen(ID_STRING));
723 if ((ret = write_headers(s, bc)) < 0)
726 if (s->avoid_negative_ts < 0)
727 s->avoid_negative_ts = 1;
734 static int get_needed_flags(NUTContext *nut, StreamContext *nus, FrameCode *fc, AVPacket *pkt){
737 if(pkt->flags & AV_PKT_FLAG_KEY ) flags |= FLAG_KEY;
738 if(pkt->stream_index != fc->stream_id ) flags |= FLAG_STREAM_ID;
739 if(pkt->size / fc->size_mul ) flags |= FLAG_SIZE_MSB;
740 if(pkt->pts - nus->last_pts != fc->pts_delta) flags |= FLAG_CODED_PTS;
741 if(pkt->size > 2*nut->max_distance ) flags |= FLAG_CHECKSUM;
742 if(FFABS(pkt->pts - nus->last_pts)
743 > nus->max_pts_distance) flags |= FLAG_CHECKSUM;
744 if( pkt->size < nut->header_len[fc->header_idx]
745 || (pkt->size > 4096 && fc->header_idx)
746 || memcmp(pkt->data, nut->header[fc->header_idx], nut->header_len[fc->header_idx]))
747 flags |= FLAG_HEADER_IDX;
749 return flags | (fc->flags & FLAG_CODED);
752 static int find_best_header_idx(NUTContext *nut, AVPacket *pkt){
760 for(i=1; i<nut->header_count; i++){
761 if( pkt->size >= nut->header_len[i]
762 && nut->header_len[i] > best_len
763 && !memcmp(pkt->data, nut->header[i], nut->header_len[i])){
765 best_len= nut->header_len[i];
771 static int nut_write_packet(AVFormatContext *s, AVPacket *pkt){
772 NUTContext *nut = s->priv_data;
773 StreamContext *nus= &nut->stream[pkt->stream_index];
774 AVIOContext *bc = s->pb, *dyn_bc;
777 int best_length, frame_code, flags, needed_flags, i, header_idx, best_header_idx;
778 int key_frame = !!(pkt->flags & AV_PKT_FLAG_KEY);
783 av_log(s, AV_LOG_ERROR, "Invalid negative packet pts %"PRId64" in input\n", pkt->pts);
784 return AVERROR(EINVAL);
787 if(1LL<<(20+3*nut->header_count) <= avio_tell(bc))
788 write_headers(s, bc);
790 if(key_frame && !(nus->last_flags & FLAG_KEY))
793 if(pkt->size + 30/*FIXME check*/ + avio_tell(bc) >= nut->last_syncpoint_pos + nut->max_distance)
796 //FIXME: Ensure store_sp is 1 in the first place.
799 Syncpoint *sp, dummy= {.pos= INT64_MAX};
801 ff_nut_reset_ts(nut, *nus->time_base, pkt->dts);
802 for(i=0; i<s->nb_streams; i++){
803 AVStream *st= s->streams[i];
804 int64_t dts_tb = av_rescale_rnd(pkt->dts,
805 nus->time_base->num * (int64_t)nut->stream[i].time_base->den,
806 nus->time_base->den * (int64_t)nut->stream[i].time_base->num,
808 int index= av_index_search_timestamp(st, dts_tb, AVSEEK_FLAG_BACKWARD);
809 if(index>=0) dummy.pos= FFMIN(dummy.pos, st->index_entries[index].pos);
811 if(dummy.pos == INT64_MAX)
813 sp= av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp,
816 nut->last_syncpoint_pos= avio_tell(bc);
817 ret = avio_open_dyn_buf(&dyn_bc);
820 put_tt(nut, nus->time_base, dyn_bc, pkt->dts);
821 ff_put_v(dyn_bc, sp ? (nut->last_syncpoint_pos - sp->pos)>>4 : 0);
822 put_packet(nut, bc, dyn_bc, 1, SYNCPOINT_STARTCODE);
824 ff_nut_add_sp(nut, nut->last_syncpoint_pos, 0/*unused*/, pkt->dts);
826 if((1ll<<60) % nut->sp_count == 0)
827 for(i=0; i<s->nb_streams; i++){
829 StreamContext *nus = &nut->stream[i];
830 nus->keyframe_pts = av_realloc(nus->keyframe_pts, 2*nut->sp_count*sizeof(*nus->keyframe_pts));
831 if(!nus->keyframe_pts)
832 return AVERROR(ENOMEM);
833 for(j=nut->sp_count == 1 ? 0 : nut->sp_count; j<2*nut->sp_count; j++)
834 nus->keyframe_pts[j] = AV_NOPTS_VALUE;
837 av_assert0(nus->last_pts != AV_NOPTS_VALUE);
839 coded_pts = pkt->pts & ((1<<nus->msb_pts_shift)-1);
840 if(ff_lsb2full(nus, coded_pts) != pkt->pts)
841 coded_pts= pkt->pts + (1<<nus->msb_pts_shift);
843 best_header_idx= find_best_header_idx(nut, pkt);
847 for(i=0; i<256; i++){
849 FrameCode *fc= &nut->frame_code[i];
850 int flags= fc->flags;
852 if(flags & FLAG_INVALID)
854 needed_flags= get_needed_flags(nut, nus, fc, pkt);
856 if(flags & FLAG_CODED){
858 flags = needed_flags;
861 if((flags & needed_flags) != needed_flags)
864 if((flags ^ needed_flags) & FLAG_KEY)
867 if(flags & FLAG_STREAM_ID)
868 length+= ff_get_v_length(pkt->stream_index);
870 if(pkt->size % fc->size_mul != fc->size_lsb)
872 if(flags & FLAG_SIZE_MSB)
873 length += ff_get_v_length(pkt->size / fc->size_mul);
875 if(flags & FLAG_CHECKSUM)
878 if(flags & FLAG_CODED_PTS)
879 length += ff_get_v_length(coded_pts);
881 if( (flags & FLAG_CODED)
882 && nut->header_len[best_header_idx] > nut->header_len[fc->header_idx]+1){
883 flags |= FLAG_HEADER_IDX;
886 if(flags & FLAG_HEADER_IDX){
887 length += 1 - nut->header_len[best_header_idx];
889 length -= nut->header_len[fc->header_idx];
893 length+= !(flags & FLAG_CODED_PTS);
894 length+= !(flags & FLAG_CHECKSUM);
896 if(length < best_length){
901 av_assert0(frame_code != -1);
902 fc= &nut->frame_code[frame_code];
904 needed_flags= get_needed_flags(nut, nus, fc, pkt);
905 header_idx= fc->header_idx;
907 ffio_init_checksum(bc, ff_crc04C11DB7_update, 0);
908 avio_w8(bc, frame_code);
909 if(flags & FLAG_CODED){
910 ff_put_v(bc, (flags^needed_flags) & ~(FLAG_CODED));
911 flags = needed_flags;
913 if(flags & FLAG_STREAM_ID) ff_put_v(bc, pkt->stream_index);
914 if(flags & FLAG_CODED_PTS) ff_put_v(bc, coded_pts);
915 if(flags & FLAG_SIZE_MSB) ff_put_v(bc, pkt->size / fc->size_mul);
916 if(flags & FLAG_HEADER_IDX) ff_put_v(bc, header_idx= best_header_idx);
918 if(flags & FLAG_CHECKSUM) avio_wl32(bc, ffio_get_checksum(bc));
919 else ffio_get_checksum(bc);
921 avio_write(bc, pkt->data + nut->header_len[header_idx], pkt->size - nut->header_len[header_idx]);
922 nus->last_flags= flags;
923 nus->last_pts= pkt->pts;
925 //FIXME just store one per syncpoint
926 if(flags & FLAG_KEY) {
928 s->streams[pkt->stream_index],
929 nut->last_syncpoint_pos,
934 if(nus->keyframe_pts && nus->keyframe_pts[nut->sp_count] == AV_NOPTS_VALUE)
935 nus->keyframe_pts[nut->sp_count] = pkt->pts;
938 if(!nut->max_pts_tb || av_compare_ts(nut->max_pts, *nut->max_pts_tb, pkt->pts, *nus->time_base) < 0) {
939 nut->max_pts = pkt->pts;
940 nut->max_pts_tb = nus->time_base;
946 static int nut_write_trailer(AVFormatContext *s){
947 NUTContext *nut= s->priv_data;
948 AVIOContext *bc = s->pb, *dyn_bc;
951 while(nut->header_count<3)
952 write_headers(s, bc);
954 ret = avio_open_dyn_buf(&dyn_bc);
956 write_index(nut, dyn_bc);
957 put_packet(nut, bc, dyn_bc, 1, INDEX_STARTCODE);
961 for(i=0; i<s->nb_streams; i++)
962 av_freep(&nut->stream[i].keyframe_pts);
964 av_freep(&nut->stream);
965 av_freep(&nut->chapter);
966 av_freep(&nut->time_base);
971 AVOutputFormat ff_nut_muxer = {
973 .long_name = NULL_IF_CONFIG_SMALL("NUT"),
974 .mime_type = "video/x-nut",
976 .priv_data_size = sizeof(NUTContext),
977 .audio_codec = CONFIG_LIBVORBIS ? AV_CODEC_ID_VORBIS :
978 CONFIG_LIBMP3LAME ? AV_CODEC_ID_MP3 : AV_CODEC_ID_MP2,
979 .video_codec = AV_CODEC_ID_MPEG4,
980 .write_header = nut_write_header,
981 .write_packet = nut_write_packet,
982 .write_trailer = nut_write_trailer,
983 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS,
984 .codec_tag = ff_nut_codec_tags,