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 //av_log(NULL, AV_LOG_ERROR, "expected_h len=%d size=%d codec_id=%d\n", len, size, c->codec_id);
101 for(i=1; i<nut->header_count; i++){
102 if( len == nut->header_len[i]
103 && !memcmp(out, nut->header[i], len)){
104 // av_log(NULL, AV_LOG_ERROR, "found %d\n", i);
108 // av_log(NULL, AV_LOG_ERROR, "nothing found\n");
112 static void build_elision_headers(AVFormatContext *s){
113 NUTContext *nut = s->priv_data;
116 //FIXME write a 2pass mode to find the maximal headers
117 static const uint8_t headers[][5]={
118 {3, 0x00, 0x00, 0x01},
119 {4, 0x00, 0x00, 0x01, 0xB6},
120 {2, 0xFF, 0xFA}, //mp3+crc
121 {2, 0xFF, 0xFB}, //mp3
122 {2, 0xFF, 0xFC}, //mp2+crc
123 {2, 0xFF, 0xFD}, //mp2
126 nut->header_count= 7;
127 for(i=1; i<nut->header_count; i++){
128 nut->header_len[i]= headers[i-1][0];
129 nut->header [i]= &headers[i-1][1];
133 static void build_frame_code(AVFormatContext *s){
134 NUTContext *nut = s->priv_data;
135 int key_frame, index, pred, stream_id;
138 int keyframe_0_esc= s->nb_streams > 2;
142 ft= &nut->frame_code[start];
143 ft->flags= FLAG_CODED;
149 /* keyframe = 0 escape */
150 FrameCode *ft= &nut->frame_code[start];
151 ft->flags= FLAG_STREAM_ID | FLAG_SIZE_MSB | FLAG_CODED_PTS;
156 for(stream_id= 0; stream_id<s->nb_streams; stream_id++){
157 int start2= start + (end-start)*stream_id / s->nb_streams;
158 int end2 = start + (end-start)*(stream_id+1) / s->nb_streams;
159 AVCodecContext *codec = s->streams[stream_id]->codec;
160 int is_audio= codec->codec_type == AVMEDIA_TYPE_AUDIO;
161 int intra_only= /*codec->intra_only || */is_audio;
164 for(key_frame=0; key_frame<2; key_frame++){
165 if(intra_only && keyframe_0_esc && key_frame==0)
169 FrameCode *ft= &nut->frame_code[start2];
170 ft->flags= FLAG_KEY*key_frame;
171 ft->flags|= FLAG_SIZE_MSB | FLAG_CODED_PTS;
172 ft->stream_id= stream_id;
175 ft->header_idx= find_header_idx(s, codec, -1, key_frame);
180 key_frame= intra_only;
183 int frame_bytes= codec->frame_size*(int64_t)codec->bit_rate / (8*codec->sample_rate);
185 for(pts=0; pts<2; pts++){
186 for(pred=0; pred<2; pred++){
187 FrameCode *ft= &nut->frame_code[start2];
188 ft->flags= FLAG_KEY*key_frame;
189 ft->stream_id= stream_id;
190 ft->size_mul=frame_bytes + 2;
191 ft->size_lsb=frame_bytes + pred;
193 ft->header_idx= find_header_idx(s, codec, frame_bytes + pred, key_frame);
198 FrameCode *ft= &nut->frame_code[start2];
199 ft->flags= FLAG_KEY | FLAG_SIZE_MSB;
200 ft->stream_id= stream_id;
207 if(codec->has_b_frames){
214 }else if(codec->codec_id == AV_CODEC_ID_VORBIS){
224 for(pred=0; pred<pred_count; pred++){
225 int start3= start2 + (end2-start2)*pred / pred_count;
226 int end3 = start2 + (end2-start2)*(pred+1) / pred_count;
228 for(index=start3; index<end3; index++){
229 FrameCode *ft= &nut->frame_code[index];
230 ft->flags= FLAG_KEY*key_frame;
231 ft->flags|= FLAG_SIZE_MSB;
232 ft->stream_id= stream_id;
233 //FIXME use single byte size and pred from last
234 ft->size_mul= end3-start3;
235 ft->size_lsb= index - start3;
236 ft->pts_delta= pred_table[pred];
238 ft->header_idx= find_header_idx(s, codec, -1, key_frame);
242 memmove(&nut->frame_code['N'+1], &nut->frame_code['N'], sizeof(FrameCode)*(255-'N'));
243 nut->frame_code[ 0].flags=
244 nut->frame_code[255].flags=
245 nut->frame_code['N'].flags= FLAG_INVALID;
248 static void put_tt(NUTContext *nut, AVRational *time_base, AVIOContext *bc, uint64_t val){
249 val *= nut->time_base_count;
250 val += time_base - nut->time_base;
255 * Store a string as vb.
257 static void put_str(AVIOContext *bc, const char *string){
258 int len= strlen(string);
261 avio_write(bc, string, len);
264 static void put_s(AVIOContext *bc, int64_t val){
265 ff_put_v(bc, 2*FFABS(val) - (val>0));
269 static inline void ff_put_v_trace(AVIOContext *bc, uint64_t v, const char *file,
270 const char *func, int line)
272 av_log(NULL, AV_LOG_DEBUG, "ff_put_v %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
277 static inline void put_s_trace(AVIOContext *bc, int64_t v, const char *file,
278 const char *func, int line)
280 av_log(NULL, AV_LOG_DEBUG, "put_s %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
284 #define ff_put_v(bc, v) ff_put_v_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
285 #define put_s(bc, v) put_s_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
288 //FIXME remove calculate_checksum
289 static void put_packet(NUTContext *nut, AVIOContext *bc, AVIOContext *dyn_bc, int calculate_checksum, uint64_t startcode){
290 uint8_t *dyn_buf=NULL;
291 int dyn_size= avio_close_dyn_buf(dyn_bc, &dyn_buf);
292 int forw_ptr= dyn_size + 4*calculate_checksum;
295 ffio_init_checksum(bc, ff_crc04C11DB7_update, 0);
296 avio_wb64(bc, startcode);
297 ff_put_v(bc, forw_ptr);
299 avio_wl32(bc, ffio_get_checksum(bc));
301 if(calculate_checksum)
302 ffio_init_checksum(bc, ff_crc04C11DB7_update, 0);
303 avio_write(bc, dyn_buf, dyn_size);
304 if(calculate_checksum)
305 avio_wl32(bc, ffio_get_checksum(bc));
310 static void write_mainheader(NUTContext *nut, AVIOContext *bc){
311 int i, j, tmp_pts, tmp_flags, tmp_stream, tmp_mul, tmp_size, tmp_fields, tmp_head_idx;
314 ff_put_v(bc, 3); /* version */
315 ff_put_v(bc, nut->avf->nb_streams);
316 ff_put_v(bc, nut->max_distance);
317 ff_put_v(bc, nut->time_base_count);
319 for(i=0; i<nut->time_base_count; i++){
320 ff_put_v(bc, nut->time_base[i].num);
321 ff_put_v(bc, nut->time_base[i].den);
327 tmp_match= 1-(1LL<<62);
333 if(tmp_pts != nut->frame_code[i].pts_delta) tmp_fields=1;
334 if(tmp_mul != nut->frame_code[i].size_mul ) tmp_fields=2;
335 if(tmp_stream != nut->frame_code[i].stream_id) tmp_fields=3;
336 if(tmp_size != nut->frame_code[i].size_lsb ) tmp_fields=4;
337 // if(tmp_res != nut->frame_code[i].res ) tmp_fields=5;
338 if(tmp_head_idx!=nut->frame_code[i].header_idx)tmp_fields=8;
340 tmp_pts = nut->frame_code[i].pts_delta;
341 tmp_flags = nut->frame_code[i].flags;
342 tmp_stream= nut->frame_code[i].stream_id;
343 tmp_mul = nut->frame_code[i].size_mul;
344 tmp_size = nut->frame_code[i].size_lsb;
345 // tmp_res = nut->frame_code[i].res;
346 tmp_head_idx= nut->frame_code[i].header_idx;
348 for(j=0; i<256; j++,i++){
353 if(nut->frame_code[i].pts_delta != tmp_pts ) break;
354 if(nut->frame_code[i].flags != tmp_flags ) break;
355 if(nut->frame_code[i].stream_id != tmp_stream) break;
356 if(nut->frame_code[i].size_mul != tmp_mul ) break;
357 if(nut->frame_code[i].size_lsb != tmp_size+j) break;
358 // if(nut->frame_code[i].res != tmp_res ) break;
359 if(nut->frame_code[i].header_idx!= tmp_head_idx) break;
361 if(j != tmp_mul - tmp_size) tmp_fields=6;
363 ff_put_v(bc, tmp_flags);
364 ff_put_v(bc, tmp_fields);
365 if(tmp_fields>0) put_s(bc, tmp_pts);
366 if(tmp_fields>1) ff_put_v(bc, tmp_mul);
367 if(tmp_fields>2) ff_put_v(bc, tmp_stream);
368 if(tmp_fields>3) ff_put_v(bc, tmp_size);
369 if(tmp_fields>4) ff_put_v(bc, 0 /*tmp_res*/);
370 if(tmp_fields>5) ff_put_v(bc, j);
371 if(tmp_fields>6) ff_put_v(bc, tmp_match);
372 if(tmp_fields>7) ff_put_v(bc, tmp_head_idx);
374 ff_put_v(bc, nut->header_count-1);
375 for(i=1; i<nut->header_count; i++){
376 ff_put_v(bc, nut->header_len[i]);
377 avio_write(bc, nut->header[i], nut->header_len[i]);
381 static int write_streamheader(AVFormatContext *avctx, AVIOContext *bc, AVStream *st, int i){
382 NUTContext *nut = avctx->priv_data;
383 AVCodecContext *codec = st->codec;
385 switch(codec->codec_type){
386 case AVMEDIA_TYPE_VIDEO: ff_put_v(bc, 0); break;
387 case AVMEDIA_TYPE_AUDIO: ff_put_v(bc, 1); break;
388 case AVMEDIA_TYPE_SUBTITLE: ff_put_v(bc, 2); break;
389 default : ff_put_v(bc, 3); break;
392 if (codec->codec_tag){
393 avio_wl32(bc, codec->codec_tag);
395 av_log(avctx, AV_LOG_ERROR, "No codec tag defined for stream %d\n", i);
396 return AVERROR(EINVAL);
399 ff_put_v(bc, nut->stream[i].time_base - nut->time_base);
400 ff_put_v(bc, nut->stream[i].msb_pts_shift);
401 ff_put_v(bc, nut->stream[i].max_pts_distance);
402 ff_put_v(bc, codec->has_b_frames);
403 avio_w8(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */
405 ff_put_v(bc, codec->extradata_size);
406 avio_write(bc, codec->extradata, codec->extradata_size);
408 switch(codec->codec_type){
409 case AVMEDIA_TYPE_AUDIO:
410 ff_put_v(bc, codec->sample_rate);
412 ff_put_v(bc, codec->channels);
414 case AVMEDIA_TYPE_VIDEO:
415 ff_put_v(bc, codec->width);
416 ff_put_v(bc, codec->height);
418 if(st->sample_aspect_ratio.num<=0 || st->sample_aspect_ratio.den<=0){
422 ff_put_v(bc, st->sample_aspect_ratio.num);
423 ff_put_v(bc, st->sample_aspect_ratio.den);
425 ff_put_v(bc, 0); /* csp type -- unknown */
433 static int add_info(AVIOContext *bc, const char *type, const char *value){
440 static int write_globalinfo(NUTContext *nut, AVIOContext *bc){
441 AVFormatContext *s= nut->avf;
442 AVDictionaryEntry *t = NULL;
444 uint8_t *dyn_buf=NULL;
445 int count=0, dyn_size;
446 int ret = avio_open_dyn_buf(&dyn_bc);
450 while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX)))
451 count += add_info(dyn_bc, t->key, t->value);
453 ff_put_v(bc, 0); //stream_if_plus1
454 ff_put_v(bc, 0); //chapter_id
455 ff_put_v(bc, 0); //timestamp_start
456 ff_put_v(bc, 0); //length
460 dyn_size= avio_close_dyn_buf(dyn_bc, &dyn_buf);
461 avio_write(bc, dyn_buf, dyn_size);
466 static int write_streaminfo(NUTContext *nut, AVIOContext *bc, int stream_id){
467 AVFormatContext *s= nut->avf;
468 AVStream* st = s->streams[stream_id];
469 AVDictionaryEntry *t = NULL;
471 uint8_t *dyn_buf=NULL;
472 int count=0, dyn_size, i;
473 int ret = avio_open_dyn_buf(&dyn_bc);
477 while ((t = av_dict_get(st->metadata, "", t, AV_DICT_IGNORE_SUFFIX)))
478 count += add_info(dyn_bc, t->key, t->value);
479 for (i=0; ff_nut_dispositions[i].flag; ++i) {
480 if (st->disposition & ff_nut_dispositions[i].flag)
481 count += add_info(dyn_bc, "Disposition", ff_nut_dispositions[i].str);
483 dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf);
486 ff_put_v(bc, stream_id + 1); //stream_id_plus1
487 ff_put_v(bc, 0); //chapter_id
488 ff_put_v(bc, 0); //timestamp_start
489 ff_put_v(bc, 0); //length
493 avio_write(bc, dyn_buf, dyn_size);
500 static int write_chapter(NUTContext *nut, AVIOContext *bc, int id)
503 uint8_t *dyn_buf = NULL;
504 AVDictionaryEntry *t = NULL;
505 AVChapter *ch = nut->avf->chapters[id];
506 int ret, dyn_size, count = 0;
508 ret = avio_open_dyn_buf(&dyn_bc);
512 ff_put_v(bc, 0); // stream_id_plus1
513 put_s(bc, id + 1); // chapter_id
514 put_tt(nut, nut->chapter[id].time_base, bc, ch->start); // chapter_start
515 ff_put_v(bc, ch->end - ch->start); // chapter_len
517 while ((t = av_dict_get(ch->metadata, "", t, AV_DICT_IGNORE_SUFFIX)))
518 count += add_info(dyn_bc, t->key, t->value);
522 dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf);
523 avio_write(bc, dyn_buf, dyn_size);
528 static int write_index(NUTContext *nut, AVIOContext *bc){
530 Syncpoint dummy= { .pos= 0 };
531 Syncpoint *next_node[2] = { NULL };
532 int64_t startpos = avio_tell(bc);
533 int64_t payload_size;
535 put_tt(nut, nut->max_pts_tb, bc, nut->max_pts);
537 ff_put_v(bc, nut->sp_count);
539 for(i=0; i<nut->sp_count; i++){
540 av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp, (void**)next_node);
541 ff_put_v(bc, (next_node[1]->pos >> 4) - (dummy.pos>>4));
542 dummy.pos = next_node[1]->pos;
545 for(i=0; i<nut->avf->nb_streams; i++){
546 StreamContext *nus= &nut->stream[i];
547 int64_t last_pts= -1;
549 for(j=0; j<nut->sp_count; j++){
550 int flag = (nus->keyframe_pts[j] != AV_NOPTS_VALUE) ^ (j+1 == nut->sp_count);
552 for(; j<nut->sp_count && (nus->keyframe_pts[j] != AV_NOPTS_VALUE) == flag; j++)
555 ff_put_v(bc, 1 + 2*flag + 4*n);
556 for(k= j - n; k<=j && k<nut->sp_count; k++) {
557 if(nus->keyframe_pts[k] == AV_NOPTS_VALUE)
559 av_assert0(nus->keyframe_pts[k] > last_pts);
560 ff_put_v(bc, nus->keyframe_pts[k] - last_pts);
561 last_pts = nus->keyframe_pts[k];
566 payload_size = avio_tell(bc) - startpos + 8 + 4;
568 avio_wb64(bc, 8 + payload_size + av_log2(payload_size) / 7 + 1 + 4*(payload_size > 4096));
573 static int write_headers(AVFormatContext *avctx, AVIOContext *bc){
574 NUTContext *nut = avctx->priv_data;
578 ff_metadata_conv_ctx(avctx, ff_nut_metadata_conv, NULL);
580 ret = avio_open_dyn_buf(&dyn_bc);
583 write_mainheader(nut, dyn_bc);
584 put_packet(nut, bc, dyn_bc, 1, MAIN_STARTCODE);
586 for (i=0; i < nut->avf->nb_streams; i++){
587 ret = avio_open_dyn_buf(&dyn_bc);
590 if ((ret = write_streamheader(avctx, dyn_bc, nut->avf->streams[i], i)) < 0)
592 put_packet(nut, bc, dyn_bc, 1, STREAM_STARTCODE);
595 ret = avio_open_dyn_buf(&dyn_bc);
598 write_globalinfo(nut, dyn_bc);
599 put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
601 for (i = 0; i < nut->avf->nb_streams; i++) {
602 ret = avio_open_dyn_buf(&dyn_bc);
605 ret = write_streaminfo(nut, dyn_bc, i);
609 put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
612 avio_close_dyn_buf(dyn_bc, &buf);
617 for (i = 0; i < nut->avf->nb_chapters; i++) {
618 ret = avio_open_dyn_buf(&dyn_bc);
621 ret = write_chapter(nut, dyn_bc, i);
624 avio_close_dyn_buf(dyn_bc, &buf);
628 put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
631 nut->last_syncpoint_pos= INT_MIN;
636 static int nut_write_header(AVFormatContext *s){
637 NUTContext *nut = s->priv_data;
638 AVIOContext *bc = s->pb;
643 nut->stream = av_mallocz(sizeof(StreamContext)*s->nb_streams);
644 nut->chapter = av_mallocz(sizeof(ChapterContext)*s->nb_chapters);
645 nut->time_base= av_mallocz(sizeof(AVRational )*(s->nb_streams +
647 if (!nut->stream || !nut->chapter || !nut->time_base) {
648 av_freep(&nut->stream);
649 av_freep(&nut->chapter);
650 av_freep(&nut->time_base);
651 return AVERROR(ENOMEM);
654 for(i=0; i<s->nb_streams; i++){
655 AVStream *st= s->streams[i];
657 AVRational time_base;
658 ff_parse_specific_params(st->codec, &time_base.den, &ssize, &time_base.num);
660 avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
662 for(j=0; j<nut->time_base_count; j++){
663 if(!memcmp(&time_base, &nut->time_base[j], sizeof(AVRational))){
667 nut->time_base[j]= time_base;
668 nut->stream[i].time_base= &nut->time_base[j];
669 if(j==nut->time_base_count)
670 nut->time_base_count++;
672 if(INT64_C(1000) * time_base.num >= time_base.den)
673 nut->stream[i].msb_pts_shift = 7;
675 nut->stream[i].msb_pts_shift = 14;
676 nut->stream[i].max_pts_distance= FFMAX(time_base.den, time_base.num) / time_base.num;
679 for (i = 0; i < s->nb_chapters; i++) {
680 AVChapter *ch = s->chapters[i];
682 for (j = 0; j < nut->time_base_count; j++) {
683 if (!memcmp(&ch->time_base, &nut->time_base[j], sizeof(AVRational)))
687 nut->time_base[j] = ch->time_base;
688 nut->chapter[i].time_base = &nut->time_base[j];
689 if(j == nut->time_base_count)
690 nut->time_base_count++;
693 nut->max_distance = MAX_DISTANCE;
694 build_elision_headers(s);
696 av_assert0(nut->frame_code['N'].flags == FLAG_INVALID);
698 avio_write(bc, ID_STRING, strlen(ID_STRING));
701 if ((ret = write_headers(s, bc)) < 0)
704 if (s->avoid_negative_ts < 0)
705 s->avoid_negative_ts = 1;
712 static int get_needed_flags(NUTContext *nut, StreamContext *nus, FrameCode *fc, AVPacket *pkt){
715 if(pkt->flags & AV_PKT_FLAG_KEY ) flags |= FLAG_KEY;
716 if(pkt->stream_index != fc->stream_id ) flags |= FLAG_STREAM_ID;
717 if(pkt->size / fc->size_mul ) flags |= FLAG_SIZE_MSB;
718 if(pkt->pts - nus->last_pts != fc->pts_delta) flags |= FLAG_CODED_PTS;
719 if(pkt->size > 2*nut->max_distance ) flags |= FLAG_CHECKSUM;
720 if(FFABS(pkt->pts - nus->last_pts)
721 > nus->max_pts_distance) flags |= FLAG_CHECKSUM;
722 if( pkt->size < nut->header_len[fc->header_idx]
723 || (pkt->size > 4096 && fc->header_idx)
724 || memcmp(pkt->data, nut->header[fc->header_idx], nut->header_len[fc->header_idx]))
725 flags |= FLAG_HEADER_IDX;
727 return flags | (fc->flags & FLAG_CODED);
730 static int find_best_header_idx(NUTContext *nut, AVPacket *pkt){
738 for(i=1; i<nut->header_count; i++){
739 if( pkt->size >= nut->header_len[i]
740 && nut->header_len[i] > best_len
741 && !memcmp(pkt->data, nut->header[i], nut->header_len[i])){
743 best_len= nut->header_len[i];
749 static int nut_write_packet(AVFormatContext *s, AVPacket *pkt){
750 NUTContext *nut = s->priv_data;
751 StreamContext *nus= &nut->stream[pkt->stream_index];
752 AVIOContext *bc = s->pb, *dyn_bc;
755 int best_length, frame_code, flags, needed_flags, i, header_idx, best_header_idx;
756 int key_frame = !!(pkt->flags & AV_PKT_FLAG_KEY);
761 av_log(s, AV_LOG_ERROR, "Invalid negative packet pts %"PRId64" in input\n", pkt->pts);
762 return AVERROR(EINVAL);
765 if(1LL<<(20+3*nut->header_count) <= avio_tell(bc))
766 write_headers(s, bc);
768 if(key_frame && !(nus->last_flags & FLAG_KEY))
771 if(pkt->size + 30/*FIXME check*/ + avio_tell(bc) >= nut->last_syncpoint_pos + nut->max_distance)
774 //FIXME: Ensure store_sp is 1 in the first place.
777 Syncpoint *sp, dummy= {.pos= INT64_MAX};
779 ff_nut_reset_ts(nut, *nus->time_base, pkt->dts);
780 for(i=0; i<s->nb_streams; i++){
781 AVStream *st= s->streams[i];
782 int64_t dts_tb = av_rescale_rnd(pkt->dts,
783 nus->time_base->num * (int64_t)nut->stream[i].time_base->den,
784 nus->time_base->den * (int64_t)nut->stream[i].time_base->num,
786 int index= av_index_search_timestamp(st, dts_tb, AVSEEK_FLAG_BACKWARD);
787 if(index>=0) dummy.pos= FFMIN(dummy.pos, st->index_entries[index].pos);
789 if(dummy.pos == INT64_MAX)
791 sp= av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp,
794 nut->last_syncpoint_pos= avio_tell(bc);
795 ret = avio_open_dyn_buf(&dyn_bc);
798 put_tt(nut, nus->time_base, dyn_bc, pkt->dts);
799 ff_put_v(dyn_bc, sp ? (nut->last_syncpoint_pos - sp->pos)>>4 : 0);
800 put_packet(nut, bc, dyn_bc, 1, SYNCPOINT_STARTCODE);
802 ff_nut_add_sp(nut, nut->last_syncpoint_pos, 0/*unused*/, pkt->dts);
804 if((1ll<<60) % nut->sp_count == 0)
805 for(i=0; i<s->nb_streams; i++){
807 StreamContext *nus = &nut->stream[i];
808 nus->keyframe_pts = av_realloc(nus->keyframe_pts, 2*nut->sp_count*sizeof(*nus->keyframe_pts));
809 if(!nus->keyframe_pts)
810 return AVERROR(ENOMEM);
811 for(j=nut->sp_count == 1 ? 0 : nut->sp_count; j<2*nut->sp_count; j++)
812 nus->keyframe_pts[j] = AV_NOPTS_VALUE;
815 av_assert0(nus->last_pts != AV_NOPTS_VALUE);
817 coded_pts = pkt->pts & ((1<<nus->msb_pts_shift)-1);
818 if(ff_lsb2full(nus, coded_pts) != pkt->pts)
819 coded_pts= pkt->pts + (1<<nus->msb_pts_shift);
821 best_header_idx= find_best_header_idx(nut, pkt);
825 for(i=0; i<256; i++){
827 FrameCode *fc= &nut->frame_code[i];
828 int flags= fc->flags;
830 if(flags & FLAG_INVALID)
832 needed_flags= get_needed_flags(nut, nus, fc, pkt);
834 if(flags & FLAG_CODED){
836 flags = needed_flags;
839 if((flags & needed_flags) != needed_flags)
842 if((flags ^ needed_flags) & FLAG_KEY)
845 if(flags & FLAG_STREAM_ID)
846 length+= ff_get_v_length(pkt->stream_index);
848 if(pkt->size % fc->size_mul != fc->size_lsb)
850 if(flags & FLAG_SIZE_MSB)
851 length += ff_get_v_length(pkt->size / fc->size_mul);
853 if(flags & FLAG_CHECKSUM)
856 if(flags & FLAG_CODED_PTS)
857 length += ff_get_v_length(coded_pts);
859 if( (flags & FLAG_CODED)
860 && nut->header_len[best_header_idx] > nut->header_len[fc->header_idx]+1){
861 flags |= FLAG_HEADER_IDX;
864 if(flags & FLAG_HEADER_IDX){
865 length += 1 - nut->header_len[best_header_idx];
867 length -= nut->header_len[fc->header_idx];
871 length+= !(flags & FLAG_CODED_PTS);
872 length+= !(flags & FLAG_CHECKSUM);
874 if(length < best_length){
879 av_assert0(frame_code != -1);
880 fc= &nut->frame_code[frame_code];
882 needed_flags= get_needed_flags(nut, nus, fc, pkt);
883 header_idx= fc->header_idx;
885 ffio_init_checksum(bc, ff_crc04C11DB7_update, 0);
886 avio_w8(bc, frame_code);
887 if(flags & FLAG_CODED){
888 ff_put_v(bc, (flags^needed_flags) & ~(FLAG_CODED));
889 flags = needed_flags;
891 if(flags & FLAG_STREAM_ID) ff_put_v(bc, pkt->stream_index);
892 if(flags & FLAG_CODED_PTS) ff_put_v(bc, coded_pts);
893 if(flags & FLAG_SIZE_MSB) ff_put_v(bc, pkt->size / fc->size_mul);
894 if(flags & FLAG_HEADER_IDX) ff_put_v(bc, header_idx= best_header_idx);
896 if(flags & FLAG_CHECKSUM) avio_wl32(bc, ffio_get_checksum(bc));
897 else ffio_get_checksum(bc);
899 avio_write(bc, pkt->data + nut->header_len[header_idx], pkt->size - nut->header_len[header_idx]);
900 nus->last_flags= flags;
901 nus->last_pts= pkt->pts;
903 //FIXME just store one per syncpoint
904 if(flags & FLAG_KEY) {
906 s->streams[pkt->stream_index],
907 nut->last_syncpoint_pos,
912 if(nus->keyframe_pts && nus->keyframe_pts[nut->sp_count] == AV_NOPTS_VALUE)
913 nus->keyframe_pts[nut->sp_count] = pkt->pts;
916 if(!nut->max_pts_tb || av_compare_ts(nut->max_pts, *nut->max_pts_tb, pkt->pts, *nus->time_base) < 0) {
917 nut->max_pts = pkt->pts;
918 nut->max_pts_tb = nus->time_base;
924 static int nut_write_trailer(AVFormatContext *s){
925 NUTContext *nut= s->priv_data;
926 AVIOContext *bc = s->pb, *dyn_bc;
929 while(nut->header_count<3)
930 write_headers(s, bc);
932 ret = avio_open_dyn_buf(&dyn_bc);
934 write_index(nut, dyn_bc);
935 put_packet(nut, bc, dyn_bc, 1, INDEX_STARTCODE);
939 for(i=0; i<s->nb_streams; i++)
940 av_freep(&nut->stream[i].keyframe_pts);
942 av_freep(&nut->stream);
943 av_freep(&nut->chapter);
944 av_freep(&nut->time_base);
949 AVOutputFormat ff_nut_muxer = {
951 .long_name = NULL_IF_CONFIG_SMALL("NUT"),
952 .mime_type = "video/x-nut",
954 .priv_data_size = sizeof(NUTContext),
955 .audio_codec = CONFIG_LIBVORBIS ? AV_CODEC_ID_VORBIS :
956 CONFIG_LIBMP3LAME ? AV_CODEC_ID_MP3 : AV_CODEC_ID_MP2,
957 .video_codec = AV_CODEC_ID_MPEG4,
958 .write_header = nut_write_header,
959 .write_packet = nut_write_packet,
960 .write_trailer = nut_write_trailer,
961 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS,
962 .codec_tag = (const AVCodecTag * const []){
963 ff_codec_bmp_tags, ff_nut_video_tags, ff_codec_wav_tags,
964 ff_nut_subtitle_tags, 0