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, char *file, char *func, int line){
270 av_log(NULL, AV_LOG_DEBUG, "ff_put_v %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
275 static inline void put_s_trace(AVIOContext *bc, int64_t v, char *file, char *func, int line){
276 av_log(NULL, AV_LOG_DEBUG, "put_s %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
280 #define ff_put_v(bc, v) ff_put_v_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
281 #define put_s(bc, v) put_s_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
284 //FIXME remove calculate_checksum
285 static void put_packet(NUTContext *nut, AVIOContext *bc, AVIOContext *dyn_bc, int calculate_checksum, uint64_t startcode){
286 uint8_t *dyn_buf=NULL;
287 int dyn_size= avio_close_dyn_buf(dyn_bc, &dyn_buf);
288 int forw_ptr= dyn_size + 4*calculate_checksum;
291 ffio_init_checksum(bc, ff_crc04C11DB7_update, 0);
292 avio_wb64(bc, startcode);
293 ff_put_v(bc, forw_ptr);
295 avio_wl32(bc, ffio_get_checksum(bc));
297 if(calculate_checksum)
298 ffio_init_checksum(bc, ff_crc04C11DB7_update, 0);
299 avio_write(bc, dyn_buf, dyn_size);
300 if(calculate_checksum)
301 avio_wl32(bc, ffio_get_checksum(bc));
306 static void write_mainheader(NUTContext *nut, AVIOContext *bc){
307 int i, j, tmp_pts, tmp_flags, tmp_stream, tmp_mul, tmp_size, tmp_fields, tmp_head_idx;
310 ff_put_v(bc, 3); /* version */
311 ff_put_v(bc, nut->avf->nb_streams);
312 ff_put_v(bc, nut->max_distance);
313 ff_put_v(bc, nut->time_base_count);
315 for(i=0; i<nut->time_base_count; i++){
316 ff_put_v(bc, nut->time_base[i].num);
317 ff_put_v(bc, nut->time_base[i].den);
323 tmp_match= 1-(1LL<<62);
329 if(tmp_pts != nut->frame_code[i].pts_delta) tmp_fields=1;
330 if(tmp_mul != nut->frame_code[i].size_mul ) tmp_fields=2;
331 if(tmp_stream != nut->frame_code[i].stream_id) tmp_fields=3;
332 if(tmp_size != nut->frame_code[i].size_lsb ) tmp_fields=4;
333 // if(tmp_res != nut->frame_code[i].res ) tmp_fields=5;
334 if(tmp_head_idx!=nut->frame_code[i].header_idx)tmp_fields=8;
336 tmp_pts = nut->frame_code[i].pts_delta;
337 tmp_flags = nut->frame_code[i].flags;
338 tmp_stream= nut->frame_code[i].stream_id;
339 tmp_mul = nut->frame_code[i].size_mul;
340 tmp_size = nut->frame_code[i].size_lsb;
341 // tmp_res = nut->frame_code[i].res;
342 tmp_head_idx= nut->frame_code[i].header_idx;
344 for(j=0; i<256; j++,i++){
349 if(nut->frame_code[i].pts_delta != tmp_pts ) break;
350 if(nut->frame_code[i].flags != tmp_flags ) break;
351 if(nut->frame_code[i].stream_id != tmp_stream) break;
352 if(nut->frame_code[i].size_mul != tmp_mul ) break;
353 if(nut->frame_code[i].size_lsb != tmp_size+j) break;
354 // if(nut->frame_code[i].res != tmp_res ) break;
355 if(nut->frame_code[i].header_idx!= tmp_head_idx) break;
357 if(j != tmp_mul - tmp_size) tmp_fields=6;
359 ff_put_v(bc, tmp_flags);
360 ff_put_v(bc, tmp_fields);
361 if(tmp_fields>0) put_s(bc, tmp_pts);
362 if(tmp_fields>1) ff_put_v(bc, tmp_mul);
363 if(tmp_fields>2) ff_put_v(bc, tmp_stream);
364 if(tmp_fields>3) ff_put_v(bc, tmp_size);
365 if(tmp_fields>4) ff_put_v(bc, 0 /*tmp_res*/);
366 if(tmp_fields>5) ff_put_v(bc, j);
367 if(tmp_fields>6) ff_put_v(bc, tmp_match);
368 if(tmp_fields>7) ff_put_v(bc, tmp_head_idx);
370 ff_put_v(bc, nut->header_count-1);
371 for(i=1; i<nut->header_count; i++){
372 ff_put_v(bc, nut->header_len[i]);
373 avio_write(bc, nut->header[i], nut->header_len[i]);
377 static int write_streamheader(AVFormatContext *avctx, AVIOContext *bc, AVStream *st, int i){
378 NUTContext *nut = avctx->priv_data;
379 AVCodecContext *codec = st->codec;
381 switch(codec->codec_type){
382 case AVMEDIA_TYPE_VIDEO: ff_put_v(bc, 0); break;
383 case AVMEDIA_TYPE_AUDIO: ff_put_v(bc, 1); break;
384 case AVMEDIA_TYPE_SUBTITLE: ff_put_v(bc, 2); break;
385 default : ff_put_v(bc, 3); break;
388 if (codec->codec_tag){
389 avio_wl32(bc, codec->codec_tag);
391 av_log(avctx, AV_LOG_ERROR, "No codec tag defined for stream %d\n", i);
392 return AVERROR(EINVAL);
395 ff_put_v(bc, nut->stream[i].time_base - nut->time_base);
396 ff_put_v(bc, nut->stream[i].msb_pts_shift);
397 ff_put_v(bc, nut->stream[i].max_pts_distance);
398 ff_put_v(bc, codec->has_b_frames);
399 avio_w8(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */
401 ff_put_v(bc, codec->extradata_size);
402 avio_write(bc, codec->extradata, codec->extradata_size);
404 switch(codec->codec_type){
405 case AVMEDIA_TYPE_AUDIO:
406 ff_put_v(bc, codec->sample_rate);
408 ff_put_v(bc, codec->channels);
410 case AVMEDIA_TYPE_VIDEO:
411 ff_put_v(bc, codec->width);
412 ff_put_v(bc, codec->height);
414 if(st->sample_aspect_ratio.num<=0 || st->sample_aspect_ratio.den<=0){
418 ff_put_v(bc, st->sample_aspect_ratio.num);
419 ff_put_v(bc, st->sample_aspect_ratio.den);
421 ff_put_v(bc, 0); /* csp type -- unknown */
429 static int add_info(AVIOContext *bc, const char *type, const char *value){
436 static int write_globalinfo(NUTContext *nut, AVIOContext *bc){
437 AVFormatContext *s= nut->avf;
438 AVDictionaryEntry *t = NULL;
440 uint8_t *dyn_buf=NULL;
441 int count=0, dyn_size;
442 int ret = avio_open_dyn_buf(&dyn_bc);
446 while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX)))
447 count += add_info(dyn_bc, t->key, t->value);
449 ff_put_v(bc, 0); //stream_if_plus1
450 ff_put_v(bc, 0); //chapter_id
451 ff_put_v(bc, 0); //timestamp_start
452 ff_put_v(bc, 0); //length
456 dyn_size= avio_close_dyn_buf(dyn_bc, &dyn_buf);
457 avio_write(bc, dyn_buf, dyn_size);
462 static int write_streaminfo(NUTContext *nut, AVIOContext *bc, int stream_id){
463 AVFormatContext *s= nut->avf;
464 AVStream* st = s->streams[stream_id];
465 AVDictionaryEntry *t = NULL;
467 uint8_t *dyn_buf=NULL;
468 int count=0, dyn_size, i;
469 int ret = avio_open_dyn_buf(&dyn_bc);
473 while ((t = av_dict_get(st->metadata, "", t, AV_DICT_IGNORE_SUFFIX)))
474 count += add_info(dyn_bc, t->key, t->value);
475 for (i=0; ff_nut_dispositions[i].flag; ++i) {
476 if (st->disposition & ff_nut_dispositions[i].flag)
477 count += add_info(dyn_bc, "Disposition", ff_nut_dispositions[i].str);
479 dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf);
482 ff_put_v(bc, stream_id + 1); //stream_id_plus1
483 ff_put_v(bc, 0); //chapter_id
484 ff_put_v(bc, 0); //timestamp_start
485 ff_put_v(bc, 0); //length
489 avio_write(bc, dyn_buf, dyn_size);
496 static int write_chapter(NUTContext *nut, AVIOContext *bc, int id)
499 uint8_t *dyn_buf = NULL;
500 AVDictionaryEntry *t = NULL;
501 AVChapter *ch = nut->avf->chapters[id];
502 int ret, dyn_size, count = 0;
504 ret = avio_open_dyn_buf(&dyn_bc);
508 ff_put_v(bc, 0); // stream_id_plus1
509 put_s(bc, id + 1); // chapter_id
510 put_tt(nut, nut->chapter[id].time_base, bc, ch->start); // chapter_start
511 ff_put_v(bc, ch->end - ch->start); // chapter_len
513 while ((t = av_dict_get(ch->metadata, "", t, AV_DICT_IGNORE_SUFFIX)))
514 count += add_info(dyn_bc, t->key, t->value);
518 dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf);
519 avio_write(bc, dyn_buf, dyn_size);
524 static int write_index(NUTContext *nut, AVIOContext *bc){
526 Syncpoint dummy= { .pos= 0 };
527 Syncpoint *next_node[2] = { NULL };
528 int64_t startpos = avio_tell(bc);
529 int64_t payload_size;
531 put_tt(nut, nut->max_pts_tb, bc, nut->max_pts);
533 ff_put_v(bc, nut->sp_count);
535 for(i=0; i<nut->sp_count; i++){
536 av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp, (void**)next_node);
537 ff_put_v(bc, (next_node[1]->pos >> 4) - (dummy.pos>>4));
538 dummy.pos = next_node[1]->pos;
541 for(i=0; i<nut->avf->nb_streams; i++){
542 StreamContext *nus= &nut->stream[i];
543 int64_t last_pts= -1;
545 for(j=0; j<nut->sp_count; j++){
546 int flag = (nus->keyframe_pts[j] != AV_NOPTS_VALUE) ^ (j+1 == nut->sp_count);
548 for(; j<nut->sp_count && (nus->keyframe_pts[j] != AV_NOPTS_VALUE) == flag; j++)
551 ff_put_v(bc, 1 + 2*flag + 4*n);
552 for(k= j - n; k<=j && k<nut->sp_count; k++) {
553 if(nus->keyframe_pts[k] == AV_NOPTS_VALUE)
555 av_assert0(nus->keyframe_pts[k] > last_pts);
556 ff_put_v(bc, nus->keyframe_pts[k] - last_pts);
557 last_pts = nus->keyframe_pts[k];
562 payload_size = avio_tell(bc) - startpos + 8 + 4;
564 avio_wb64(bc, 8 + payload_size + av_log2(payload_size) / 7 + 1 + 4*(payload_size > 4096));
569 static int write_headers(AVFormatContext *avctx, AVIOContext *bc){
570 NUTContext *nut = avctx->priv_data;
574 ff_metadata_conv_ctx(avctx, ff_nut_metadata_conv, NULL);
576 ret = avio_open_dyn_buf(&dyn_bc);
579 write_mainheader(nut, dyn_bc);
580 put_packet(nut, bc, dyn_bc, 1, MAIN_STARTCODE);
582 for (i=0; i < nut->avf->nb_streams; i++){
583 ret = avio_open_dyn_buf(&dyn_bc);
586 if ((ret = write_streamheader(avctx, dyn_bc, nut->avf->streams[i], i)) < 0)
588 put_packet(nut, bc, dyn_bc, 1, STREAM_STARTCODE);
591 ret = avio_open_dyn_buf(&dyn_bc);
594 write_globalinfo(nut, dyn_bc);
595 put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
597 for (i = 0; i < nut->avf->nb_streams; i++) {
598 ret = avio_open_dyn_buf(&dyn_bc);
601 ret = write_streaminfo(nut, dyn_bc, i);
605 put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
608 avio_close_dyn_buf(dyn_bc, &buf);
613 for (i = 0; i < nut->avf->nb_chapters; i++) {
614 ret = avio_open_dyn_buf(&dyn_bc);
617 ret = write_chapter(nut, dyn_bc, i);
620 avio_close_dyn_buf(dyn_bc, &buf);
624 put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
627 nut->last_syncpoint_pos= INT_MIN;
632 static int nut_write_header(AVFormatContext *s){
633 NUTContext *nut = s->priv_data;
634 AVIOContext *bc = s->pb;
639 nut->stream = av_mallocz(sizeof(StreamContext)*s->nb_streams);
640 nut->chapter = av_mallocz(sizeof(ChapterContext)*s->nb_chapters);
641 nut->time_base= av_mallocz(sizeof(AVRational )*(s->nb_streams +
643 if (!nut->stream || !nut->chapter || !nut->time_base) {
644 av_freep(&nut->stream);
645 av_freep(&nut->chapter);
646 av_freep(&nut->time_base);
647 return AVERROR(ENOMEM);
650 for(i=0; i<s->nb_streams; i++){
651 AVStream *st= s->streams[i];
653 AVRational time_base;
654 ff_parse_specific_params(st->codec, &time_base.den, &ssize, &time_base.num);
656 avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
658 for(j=0; j<nut->time_base_count; j++){
659 if(!memcmp(&time_base, &nut->time_base[j], sizeof(AVRational))){
663 nut->time_base[j]= time_base;
664 nut->stream[i].time_base= &nut->time_base[j];
665 if(j==nut->time_base_count)
666 nut->time_base_count++;
668 if(INT64_C(1000) * time_base.num >= time_base.den)
669 nut->stream[i].msb_pts_shift = 7;
671 nut->stream[i].msb_pts_shift = 14;
672 nut->stream[i].max_pts_distance= FFMAX(time_base.den, time_base.num) / time_base.num;
675 for (i = 0; i < s->nb_chapters; i++) {
676 AVChapter *ch = s->chapters[i];
678 for (j = 0; j < nut->time_base_count; j++) {
679 if (!memcmp(&ch->time_base, &nut->time_base[j], sizeof(AVRational)))
683 nut->time_base[j] = ch->time_base;
684 nut->chapter[i].time_base = &nut->time_base[j];
685 if(j == nut->time_base_count)
686 nut->time_base_count++;
689 nut->max_distance = MAX_DISTANCE;
690 build_elision_headers(s);
692 av_assert0(nut->frame_code['N'].flags == FLAG_INVALID);
694 avio_write(bc, ID_STRING, strlen(ID_STRING));
697 if ((ret = write_headers(s, bc)) < 0)
707 static int get_needed_flags(NUTContext *nut, StreamContext *nus, FrameCode *fc, AVPacket *pkt){
710 if(pkt->flags & AV_PKT_FLAG_KEY ) flags |= FLAG_KEY;
711 if(pkt->stream_index != fc->stream_id ) flags |= FLAG_STREAM_ID;
712 if(pkt->size / fc->size_mul ) flags |= FLAG_SIZE_MSB;
713 if(pkt->pts - nus->last_pts != fc->pts_delta) flags |= FLAG_CODED_PTS;
714 if(pkt->size > 2*nut->max_distance ) flags |= FLAG_CHECKSUM;
715 if(FFABS(pkt->pts - nus->last_pts)
716 > nus->max_pts_distance) flags |= FLAG_CHECKSUM;
717 if( pkt->size < nut->header_len[fc->header_idx]
718 || (pkt->size > 4096 && fc->header_idx)
719 || memcmp(pkt->data, nut->header[fc->header_idx], nut->header_len[fc->header_idx]))
720 flags |= FLAG_HEADER_IDX;
722 return flags | (fc->flags & FLAG_CODED);
725 static int find_best_header_idx(NUTContext *nut, AVPacket *pkt){
733 for(i=1; i<nut->header_count; i++){
734 if( pkt->size >= nut->header_len[i]
735 && nut->header_len[i] > best_len
736 && !memcmp(pkt->data, nut->header[i], nut->header_len[i])){
738 best_len= nut->header_len[i];
744 static int nut_write_packet(AVFormatContext *s, AVPacket *pkt){
745 NUTContext *nut = s->priv_data;
746 StreamContext *nus= &nut->stream[pkt->stream_index];
747 AVIOContext *bc = s->pb, *dyn_bc;
750 int best_length, frame_code, flags, needed_flags, i, header_idx, best_header_idx;
751 int key_frame = !!(pkt->flags & AV_PKT_FLAG_KEY);
756 av_log(s, AV_LOG_ERROR, "Invalid negative packet pts %"PRId64" in input\n", pkt->pts);
757 return AVERROR(EINVAL);
760 if(1LL<<(20+3*nut->header_count) <= avio_tell(bc))
761 write_headers(s, bc);
763 if(key_frame && !(nus->last_flags & FLAG_KEY))
766 if(pkt->size + 30/*FIXME check*/ + avio_tell(bc) >= nut->last_syncpoint_pos + nut->max_distance)
769 //FIXME: Ensure store_sp is 1 in the first place.
772 Syncpoint *sp, dummy= {.pos= INT64_MAX};
774 ff_nut_reset_ts(nut, *nus->time_base, pkt->dts);
775 for(i=0; i<s->nb_streams; i++){
776 AVStream *st= s->streams[i];
777 int64_t dts_tb = av_rescale_rnd(pkt->dts,
778 nus->time_base->num * (int64_t)nut->stream[i].time_base->den,
779 nus->time_base->den * (int64_t)nut->stream[i].time_base->num,
781 int index= av_index_search_timestamp(st, dts_tb, AVSEEK_FLAG_BACKWARD);
782 if(index>=0) dummy.pos= FFMIN(dummy.pos, st->index_entries[index].pos);
784 if(dummy.pos == INT64_MAX)
786 sp= av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp,
789 nut->last_syncpoint_pos= avio_tell(bc);
790 ret = avio_open_dyn_buf(&dyn_bc);
793 put_tt(nut, nus->time_base, dyn_bc, pkt->dts);
794 ff_put_v(dyn_bc, sp ? (nut->last_syncpoint_pos - sp->pos)>>4 : 0);
795 put_packet(nut, bc, dyn_bc, 1, SYNCPOINT_STARTCODE);
797 ff_nut_add_sp(nut, nut->last_syncpoint_pos, 0/*unused*/, pkt->dts);
799 if((1ll<<60) % nut->sp_count == 0)
800 for(i=0; i<s->nb_streams; i++){
802 StreamContext *nus = &nut->stream[i];
803 nus->keyframe_pts = av_realloc(nus->keyframe_pts, 2*nut->sp_count*sizeof(*nus->keyframe_pts));
804 if(!nus->keyframe_pts)
805 return AVERROR(ENOMEM);
806 for(j=nut->sp_count == 1 ? 0 : nut->sp_count; j<2*nut->sp_count; j++)
807 nus->keyframe_pts[j] = AV_NOPTS_VALUE;
810 av_assert0(nus->last_pts != AV_NOPTS_VALUE);
812 coded_pts = pkt->pts & ((1<<nus->msb_pts_shift)-1);
813 if(ff_lsb2full(nus, coded_pts) != pkt->pts)
814 coded_pts= pkt->pts + (1<<nus->msb_pts_shift);
816 best_header_idx= find_best_header_idx(nut, pkt);
820 for(i=0; i<256; i++){
822 FrameCode *fc= &nut->frame_code[i];
823 int flags= fc->flags;
825 if(flags & FLAG_INVALID)
827 needed_flags= get_needed_flags(nut, nus, fc, pkt);
829 if(flags & FLAG_CODED){
831 flags = needed_flags;
834 if((flags & needed_flags) != needed_flags)
837 if((flags ^ needed_flags) & FLAG_KEY)
840 if(flags & FLAG_STREAM_ID)
841 length+= ff_get_v_length(pkt->stream_index);
843 if(pkt->size % fc->size_mul != fc->size_lsb)
845 if(flags & FLAG_SIZE_MSB)
846 length += ff_get_v_length(pkt->size / fc->size_mul);
848 if(flags & FLAG_CHECKSUM)
851 if(flags & FLAG_CODED_PTS)
852 length += ff_get_v_length(coded_pts);
854 if( (flags & FLAG_CODED)
855 && nut->header_len[best_header_idx] > nut->header_len[fc->header_idx]+1){
856 flags |= FLAG_HEADER_IDX;
859 if(flags & FLAG_HEADER_IDX){
860 length += 1 - nut->header_len[best_header_idx];
862 length -= nut->header_len[fc->header_idx];
866 length+= !(flags & FLAG_CODED_PTS);
867 length+= !(flags & FLAG_CHECKSUM);
869 if(length < best_length){
874 av_assert0(frame_code != -1);
875 fc= &nut->frame_code[frame_code];
877 needed_flags= get_needed_flags(nut, nus, fc, pkt);
878 header_idx= fc->header_idx;
880 ffio_init_checksum(bc, ff_crc04C11DB7_update, 0);
881 avio_w8(bc, frame_code);
882 if(flags & FLAG_CODED){
883 ff_put_v(bc, (flags^needed_flags) & ~(FLAG_CODED));
884 flags = needed_flags;
886 if(flags & FLAG_STREAM_ID) ff_put_v(bc, pkt->stream_index);
887 if(flags & FLAG_CODED_PTS) ff_put_v(bc, coded_pts);
888 if(flags & FLAG_SIZE_MSB) ff_put_v(bc, pkt->size / fc->size_mul);
889 if(flags & FLAG_HEADER_IDX) ff_put_v(bc, header_idx= best_header_idx);
891 if(flags & FLAG_CHECKSUM) avio_wl32(bc, ffio_get_checksum(bc));
892 else ffio_get_checksum(bc);
894 avio_write(bc, pkt->data + nut->header_len[header_idx], pkt->size - nut->header_len[header_idx]);
895 nus->last_flags= flags;
896 nus->last_pts= pkt->pts;
898 //FIXME just store one per syncpoint
899 if(flags & FLAG_KEY) {
901 s->streams[pkt->stream_index],
902 nut->last_syncpoint_pos,
907 if(nus->keyframe_pts && nus->keyframe_pts[nut->sp_count] == AV_NOPTS_VALUE)
908 nus->keyframe_pts[nut->sp_count] = pkt->pts;
911 if(!nut->max_pts_tb || av_compare_ts(nut->max_pts, *nut->max_pts_tb, pkt->pts, *nus->time_base) < 0) {
912 nut->max_pts = pkt->pts;
913 nut->max_pts_tb = nus->time_base;
919 static int nut_write_trailer(AVFormatContext *s){
920 NUTContext *nut= s->priv_data;
921 AVIOContext *bc = s->pb, *dyn_bc;
924 while(nut->header_count<3)
925 write_headers(s, bc);
927 ret = avio_open_dyn_buf(&dyn_bc);
929 write_index(nut, dyn_bc);
930 put_packet(nut, bc, dyn_bc, 1, INDEX_STARTCODE);
935 for(i=0; i<s->nb_streams; i++)
936 av_freep(&nut->stream[i].keyframe_pts);
938 av_freep(&nut->stream);
939 av_freep(&nut->chapter);
940 av_freep(&nut->time_base);
945 AVOutputFormat ff_nut_muxer = {
947 .long_name = NULL_IF_CONFIG_SMALL("NUT"),
948 .mime_type = "video/x-nut",
950 .priv_data_size = sizeof(NUTContext),
951 .audio_codec = CONFIG_LIBVORBIS ? AV_CODEC_ID_VORBIS :
952 CONFIG_LIBMP3LAME ? AV_CODEC_ID_MP3 : AV_CODEC_ID_MP2,
953 .video_codec = AV_CODEC_ID_MPEG4,
954 .write_header = nut_write_header,
955 .write_packet = nut_write_packet,
956 .write_trailer = nut_write_trailer,
957 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS,
958 .codec_tag = (const AVCodecTag * const []){
959 ff_codec_bmp_tags, ff_nut_video_tags, ff_codec_wav_tags,
960 ff_nut_subtitle_tags, 0