3 * Copyright (c) 2004-2007 Michael Niedermayer
5 * This file is part of Libav.
7 * Libav 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 * Libav 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 Libav; 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 "libavcodec/mpegaudiodata.h"
29 #include "avio_internal.h"
31 static int find_expected_header(AVCodecContext *c, int size, int key_frame,
34 int sample_rate = c->sample_rate;
41 if (c->codec_id == AV_CODEC_ID_MPEG4) {
48 } else if (c->codec_id == AV_CODEC_ID_MPEG1VIDEO ||
49 c->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
51 } else if (c->codec_id == AV_CODEC_ID_H264) {
53 } else if (c->codec_id == AV_CODEC_ID_MP3 ||
54 c->codec_id == AV_CODEC_ID_MP2) {
55 int lsf, mpeg25, sample_rate_index, bitrate_index, frame_size;
56 int layer = c->codec_id == AV_CODEC_ID_MP3 ? 3 : 2;
57 unsigned int header = 0xFFF00000;
59 lsf = sample_rate < (24000 + 32000) / 2;
60 mpeg25 = sample_rate < (12000 + 16000) / 2;
61 sample_rate <<= lsf + mpeg25;
62 if (sample_rate < (32000 + 44100) / 2)
63 sample_rate_index = 2;
64 else if (sample_rate < (44100 + 48000) / 2)
65 sample_rate_index = 0;
67 sample_rate_index = 1;
69 sample_rate = avpriv_mpa_freq_tab[sample_rate_index] >> (lsf + mpeg25);
71 for (bitrate_index = 2; bitrate_index < 30; bitrate_index++) {
73 avpriv_mpa_bitrate_tab[lsf][layer - 1][bitrate_index >> 1];
74 frame_size = (frame_size * 144000) / (sample_rate << lsf) +
77 if (frame_size == size)
81 header |= (!lsf) << 19;
82 header |= (4 - layer) << 17;
83 header |= 1 << 16; //no crc
86 return 2; //we guess there is no crc, if there is one the user clearly does not care about overhead
87 if (bitrate_index == 30)
88 return -1; //something is wrong ...
90 header |= (bitrate_index >> 1) << 12;
91 header |= sample_rate_index << 10;
92 header |= (bitrate_index & 1) << 9;
94 return 2; //FIXME actually put the needed ones in build_elision_headers()
95 return 3; //we guess that the private bit is not set
96 //FIXME the above assumptions should be checked, if these turn out false too often something should be done
101 static int find_header_idx(AVFormatContext *s, AVCodecContext *c, int size,
104 NUTContext *nut = s->priv_data;
107 int len = find_expected_header(c, size, frame_type, out);
109 for (i = 1; i < nut->header_count; i++) {
110 if (len == nut->header_len[i] && !memcmp(out, nut->header[i], len)) {
118 static void build_elision_headers(AVFormatContext *s)
120 NUTContext *nut = s->priv_data;
123 //FIXME write a 2pass mode to find the maximal headers
124 static const uint8_t headers[][5] = {
125 { 3, 0x00, 0x00, 0x01 },
126 { 4, 0x00, 0x00, 0x01, 0xB6},
127 { 2, 0xFF, 0xFA }, //mp3+crc
128 { 2, 0xFF, 0xFB }, //mp3
129 { 2, 0xFF, 0xFC }, //mp2+crc
130 { 2, 0xFF, 0xFD }, //mp2
133 nut->header_count = 7;
134 for (i = 1; i < nut->header_count; i++) {
135 nut->header_len[i] = headers[i - 1][0];
136 nut->header[i] = &headers[i - 1][1];
140 static void build_frame_code(AVFormatContext *s)
142 NUTContext *nut = s->priv_data;
143 int key_frame, index, pred, stream_id;
146 int keyframe_0_esc = s->nb_streams > 2;
150 ft = &nut->frame_code[start];
151 ft->flags = FLAG_CODED;
156 if (keyframe_0_esc) {
157 /* keyframe = 0 escape */
158 FrameCode *ft = &nut->frame_code[start];
159 ft->flags = FLAG_STREAM_ID | FLAG_SIZE_MSB | FLAG_CODED_PTS;
164 for (stream_id = 0; stream_id < s->nb_streams; stream_id++) {
165 int start2 = start + (end - start) * stream_id / s->nb_streams;
166 int end2 = start + (end - start) * (stream_id + 1) / s->nb_streams;
167 AVCodecContext *codec = s->streams[stream_id]->codec;
168 int is_audio = codec->codec_type == AVMEDIA_TYPE_AUDIO;
169 int intra_only = /*codec->intra_only || */ is_audio;
172 for (key_frame = 0; key_frame < 2; key_frame++) {
173 if (!intra_only || !keyframe_0_esc || key_frame != 0) {
174 FrameCode *ft = &nut->frame_code[start2];
175 ft->flags = FLAG_KEY * key_frame;
176 ft->flags |= FLAG_SIZE_MSB | FLAG_CODED_PTS;
177 ft->stream_id = stream_id;
180 ft->header_idx = find_header_idx(s, codec, -1, key_frame);
185 key_frame = intra_only;
187 int frame_bytes = codec->frame_size * (int64_t)codec->bit_rate /
188 (8 * codec->sample_rate);
190 for (pts = 0; pts < 2; pts++)
191 for (pred = 0; pred < 2; pred++) {
192 FrameCode *ft = &nut->frame_code[start2];
193 ft->flags = FLAG_KEY * key_frame;
194 ft->stream_id = stream_id;
195 ft->size_mul = frame_bytes + 2;
196 ft->size_lsb = frame_bytes + pred;
198 ft->header_idx = find_header_idx(s, codec, frame_bytes + pred, key_frame);
202 FrameCode *ft = &nut->frame_code[start2];
203 ft->flags = FLAG_KEY | FLAG_SIZE_MSB;
204 ft->stream_id = stream_id;
210 if (codec->has_b_frames) {
217 } else if (codec->codec_id == AV_CODEC_ID_VORBIS) {
227 for (pred = 0; pred < pred_count; pred++) {
228 int start3 = start2 + (end2 - start2) * pred / pred_count;
229 int end3 = start2 + (end2 - start2) * (pred + 1) / pred_count;
231 for (index = start3; index < end3; index++) {
232 FrameCode *ft = &nut->frame_code[index];
233 ft->flags = FLAG_KEY * key_frame;
234 ft->flags |= FLAG_SIZE_MSB;
235 ft->stream_id = stream_id;
236 //FIXME use single byte size and pred from last
237 ft->size_mul = end3 - start3;
238 ft->size_lsb = index - start3;
239 ft->pts_delta = pred_table[pred];
241 ft->header_idx = find_header_idx(s, codec, -1, key_frame);
245 memmove(&nut->frame_code['N' + 1], &nut->frame_code['N'],
246 sizeof(FrameCode) * (255 - 'N'));
247 nut->frame_code[0].flags =
248 nut->frame_code[255].flags =
249 nut->frame_code['N'].flags = FLAG_INVALID;
252 static void put_tt(NUTContext *nut, AVRational *time_base, AVIOContext *bc,
255 val *= nut->time_base_count;
256 val += time_base - nut->time_base;
260 * Store a string as vb.
262 static void put_str(AVIOContext *bc, const char *string)
264 int len = strlen(string);
267 avio_write(bc, string, len);
270 static void put_s(AVIOContext *bc, int64_t val)
272 ff_put_v(bc, 2 * FFABS(val) - (val > 0));
276 static inline void ff_put_v_trace(AVIOContext *bc, uint64_t v, const char *file,
277 const char *func, int line)
279 av_log(NULL, AV_LOG_DEBUG, "ff_put_v %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
284 static inline void put_s_trace(AVIOContext *bc, int64_t v, const char *file,
285 const char *func, int line)
287 av_log(NULL, AV_LOG_DEBUG, "put_s %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
291 #define ff_put_v(bc, v) ff_put_v_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
292 #define put_s(bc, v) put_s_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
295 //FIXME remove calculate_checksum
296 static void put_packet(NUTContext *nut, AVIOContext *bc, AVIOContext *dyn_bc,
297 int calculate_checksum, uint64_t startcode)
299 uint8_t *dyn_buf = NULL;
300 int dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf);
301 int forw_ptr = dyn_size + 4 * calculate_checksum;
304 ffio_init_checksum(bc, ff_crc04C11DB7_update, 0);
305 avio_wb64(bc, startcode);
306 ff_put_v(bc, forw_ptr);
308 avio_wl32(bc, ffio_get_checksum(bc));
310 if (calculate_checksum)
311 ffio_init_checksum(bc, ff_crc04C11DB7_update, 0);
312 avio_write(bc, dyn_buf, dyn_size);
313 if (calculate_checksum)
314 avio_wl32(bc, ffio_get_checksum(bc));
319 static void write_mainheader(NUTContext *nut, AVIOContext *bc)
321 int i, j, tmp_pts, tmp_flags, tmp_stream, tmp_mul, tmp_size, tmp_fields,
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);
340 for (i = 0; i < 256; ) {
344 if (tmp_pts != nut->frame_code[i].pts_delta)
346 if (tmp_mul != nut->frame_code[i].size_mul)
348 if (tmp_stream != nut->frame_code[i].stream_id)
350 if (tmp_size != nut->frame_code[i].size_lsb)
352 // if(tmp_res != nut->frame_code[i].res ) tmp_fields=5;
353 if (tmp_head_idx != nut->frame_code[i].header_idx)
356 tmp_pts = nut->frame_code[i].pts_delta;
357 tmp_flags = nut->frame_code[i].flags;
358 tmp_stream = nut->frame_code[i].stream_id;
359 tmp_mul = nut->frame_code[i].size_mul;
360 tmp_size = nut->frame_code[i].size_lsb;
361 // tmp_res = nut->frame_code[i].res;
362 tmp_head_idx = nut->frame_code[i].header_idx;
364 for (j = 0; i < 256; j++, i++) {
369 if (nut->frame_code[i].pts_delta != tmp_pts ||
370 nut->frame_code[i].flags != tmp_flags ||
371 nut->frame_code[i].stream_id != tmp_stream ||
372 nut->frame_code[i].size_mul != tmp_mul ||
373 nut->frame_code[i].size_lsb != tmp_size + j ||
374 // nut->frame_code[i].res != tmp_res ||
375 nut->frame_code[i].header_idx != tmp_head_idx)
378 if (j != tmp_mul - tmp_size)
381 ff_put_v(bc, tmp_flags);
382 ff_put_v(bc, tmp_fields);
386 ff_put_v(bc, tmp_mul);
388 ff_put_v(bc, tmp_stream);
390 ff_put_v(bc, tmp_size);
392 ff_put_v(bc, 0 /*tmp_res*/);
396 ff_put_v(bc, tmp_match);
398 ff_put_v(bc, tmp_head_idx);
400 ff_put_v(bc, nut->header_count - 1);
401 for (i = 1; i < nut->header_count; i++) {
402 ff_put_v(bc, nut->header_len[i]);
403 avio_write(bc, nut->header[i], nut->header_len[i]);
407 static int write_streamheader(AVFormatContext *avctx, AVIOContext *bc,
410 NUTContext *nut = avctx->priv_data;
411 AVCodecContext *codec = st->codec;
412 unsigned codec_tag = av_codec_get_tag(ff_nut_codec_tags, codec->codec_id);
415 switch (codec->codec_type) {
416 case AVMEDIA_TYPE_VIDEO:
419 case AVMEDIA_TYPE_AUDIO:
422 case AVMEDIA_TYPE_SUBTITLE:
431 if (!codec_tag || codec->codec_id == AV_CODEC_ID_RAWVIDEO)
432 codec_tag = codec->codec_tag;
435 avio_wl32(bc, codec_tag);
437 av_log(avctx, AV_LOG_ERROR, "No codec tag defined for stream %d\n", i);
438 return AVERROR(EINVAL);
441 ff_put_v(bc, nut->stream[i].time_base - nut->time_base);
442 ff_put_v(bc, nut->stream[i].msb_pts_shift);
443 ff_put_v(bc, nut->stream[i].max_pts_distance);
444 ff_put_v(bc, codec->has_b_frames);
445 avio_w8(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */
447 ff_put_v(bc, codec->extradata_size);
448 avio_write(bc, codec->extradata, codec->extradata_size);
450 switch (codec->codec_type) {
451 case AVMEDIA_TYPE_AUDIO:
452 ff_put_v(bc, codec->sample_rate);
454 ff_put_v(bc, codec->channels);
456 case AVMEDIA_TYPE_VIDEO:
457 ff_put_v(bc, codec->width);
458 ff_put_v(bc, codec->height);
460 if (st->sample_aspect_ratio.num <= 0 ||
461 st->sample_aspect_ratio.den <= 0) {
465 ff_put_v(bc, st->sample_aspect_ratio.num);
466 ff_put_v(bc, st->sample_aspect_ratio.den);
468 ff_put_v(bc, 0); /* csp type -- unknown */
476 static int add_info(AVIOContext *bc, const char *type, const char *value)
484 static int write_globalinfo(NUTContext *nut, AVIOContext *bc)
486 AVFormatContext *s = nut->avf;
487 AVDictionaryEntry *t = NULL;
489 uint8_t *dyn_buf = NULL;
490 int count = 0, dyn_size;
491 int ret = avio_open_dyn_buf(&dyn_bc);
495 while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX)))
496 count += add_info(dyn_bc, t->key, t->value);
498 ff_put_v(bc, 0); //stream_if_plus1
499 ff_put_v(bc, 0); //chapter_id
500 ff_put_v(bc, 0); //timestamp_start
501 ff_put_v(bc, 0); //length
505 dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf);
506 avio_write(bc, dyn_buf, dyn_size);
511 static int write_streaminfo(NUTContext *nut, AVIOContext *bc, int stream_id){
512 AVFormatContext *s= nut->avf;
513 AVStream* st = s->streams[stream_id];
515 uint8_t *dyn_buf=NULL;
516 int count=0, dyn_size, i;
517 int ret = avio_open_dyn_buf(&dyn_bc);
521 for (i=0; ff_nut_dispositions[i].flag; ++i) {
522 if (st->disposition & ff_nut_dispositions[i].flag)
523 count += add_info(dyn_bc, "Disposition", ff_nut_dispositions[i].str);
525 dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf);
528 ff_put_v(bc, stream_id + 1); //stream_id_plus1
529 ff_put_v(bc, 0); //chapter_id
530 ff_put_v(bc, 0); //timestamp_start
531 ff_put_v(bc, 0); //length
535 avio_write(bc, dyn_buf, dyn_size);
542 static int write_chapter(NUTContext *nut, AVIOContext *bc, int id)
545 uint8_t *dyn_buf = NULL;
546 AVDictionaryEntry *t = NULL;
547 AVChapter *ch = nut->avf->chapters[id];
548 int ret, dyn_size, count = 0;
550 ret = avio_open_dyn_buf(&dyn_bc);
554 ff_put_v(bc, 0); // stream_id_plus1
555 put_s(bc, id + 1); // chapter_id
556 put_tt(nut, nut->chapter[id].time_base, bc, ch->start); // chapter_start
557 ff_put_v(bc, ch->end - ch->start); // chapter_len
559 while ((t = av_dict_get(ch->metadata, "", t, AV_DICT_IGNORE_SUFFIX)))
560 count += add_info(dyn_bc, t->key, t->value);
564 dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf);
565 avio_write(bc, dyn_buf, dyn_size);
570 static int write_headers(AVFormatContext *avctx, AVIOContext *bc)
572 NUTContext *nut = avctx->priv_data;
576 ff_metadata_conv_ctx(avctx, ff_nut_metadata_conv, NULL);
578 ret = avio_open_dyn_buf(&dyn_bc);
581 write_mainheader(nut, dyn_bc);
582 put_packet(nut, bc, dyn_bc, 1, MAIN_STARTCODE);
584 for (i = 0; i < nut->avf->nb_streams; i++) {
585 ret = avio_open_dyn_buf(&dyn_bc);
588 ret = write_streamheader(avctx, dyn_bc, nut->avf->streams[i], i);
591 put_packet(nut, bc, dyn_bc, 1, STREAM_STARTCODE);
594 ret = avio_open_dyn_buf(&dyn_bc);
597 write_globalinfo(nut, dyn_bc);
598 put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
600 for (i = 0; i < nut->avf->nb_streams; i++) {
601 ret = avio_open_dyn_buf(&dyn_bc);
604 ret = write_streaminfo(nut, dyn_bc, i);
608 put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
611 avio_close_dyn_buf(dyn_bc, &buf);
616 for (i = 0; i < nut->avf->nb_chapters; i++) {
617 ret = avio_open_dyn_buf(&dyn_bc);
620 ret = write_chapter(nut, dyn_bc, i);
623 avio_close_dyn_buf(dyn_bc, &buf);
627 put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
630 nut->last_syncpoint_pos = INT_MIN;
635 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);
645 nut->chapter = av_mallocz(sizeof(ChapterContext) * s->nb_chapters);
646 nut->time_base = av_mallocz(sizeof(AVRational) * (s->nb_streams +
648 if (!nut->stream || (s->nb_chapters && !nut->chapter) || !nut->time_base) {
649 av_freep(&nut->stream);
650 av_freep(&nut->chapter);
651 av_freep(&nut->time_base);
652 return AVERROR(ENOMEM);
655 for (i = 0; i < s->nb_streams; i++) {
656 AVStream *st = s->streams[i];
658 AVRational time_base;
659 ff_parse_specific_params(st->codec, &time_base.den, &ssize,
662 avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
664 for (j = 0; j < nut->time_base_count; j++)
665 if (!memcmp(&time_base, &nut->time_base[j], sizeof(AVRational))) {
668 nut->time_base[j] = time_base;
669 nut->stream[i].time_base = &nut->time_base[j];
670 if (j == nut->time_base_count)
671 nut->time_base_count++;
673 if (INT64_C(1000) * time_base.num >= time_base.den)
674 nut->stream[i].msb_pts_shift = 7;
676 nut->stream[i].msb_pts_shift = 14;
677 nut->stream[i].max_pts_distance =
678 FFMAX(time_base.den, time_base.num) / time_base.num;
681 for (i = 0; i < s->nb_chapters; i++) {
682 AVChapter *ch = s->chapters[i];
684 for (j = 0; j < nut->time_base_count; j++)
685 if (!memcmp(&ch->time_base, &nut->time_base[j], sizeof(AVRational)))
688 nut->time_base[j] = ch->time_base;
689 nut->chapter[i].time_base = &nut->time_base[j];
690 if (j == nut->time_base_count)
691 nut->time_base_count++;
694 nut->max_distance = MAX_DISTANCE;
695 build_elision_headers(s);
697 assert(nut->frame_code['N'].flags == FLAG_INVALID);
699 avio_write(bc, ID_STRING, strlen(ID_STRING));
702 if ((ret = write_headers(s, bc)) < 0)
712 static int get_needed_flags(NUTContext *nut, StreamContext *nus, FrameCode *fc,
717 if (pkt->flags & AV_PKT_FLAG_KEY)
719 if (pkt->stream_index != fc->stream_id)
720 flags |= FLAG_STREAM_ID;
721 if (pkt->size / fc->size_mul)
722 flags |= FLAG_SIZE_MSB;
723 if (pkt->pts - nus->last_pts != fc->pts_delta)
724 flags |= FLAG_CODED_PTS;
725 if (pkt->size > 2 * nut->max_distance)
726 flags |= FLAG_CHECKSUM;
727 if (FFABS(pkt->pts - nus->last_pts) > nus->max_pts_distance)
728 flags |= FLAG_CHECKSUM;
729 if (pkt->size < nut->header_len[fc->header_idx] ||
730 (pkt->size > 4096 && fc->header_idx) ||
731 memcmp(pkt->data, nut->header[fc->header_idx],
732 nut->header_len[fc->header_idx]))
733 flags |= FLAG_HEADER_IDX;
735 return flags | (fc->flags & FLAG_CODED);
738 static int find_best_header_idx(NUTContext *nut, AVPacket *pkt)
744 if (pkt->size > 4096)
747 for (i = 1; i < nut->header_count; i++)
748 if (pkt->size >= nut->header_len[i]
749 && nut->header_len[i] > best_len
750 && !memcmp(pkt->data, nut->header[i], nut->header_len[i])) {
752 best_len = nut->header_len[i];
757 static int nut_write_packet(AVFormatContext *s, AVPacket *pkt)
759 NUTContext *nut = s->priv_data;
760 StreamContext *nus = &nut->stream[pkt->stream_index];
761 AVIOContext *bc = s->pb, *dyn_bc;
764 int best_length, frame_code, flags, needed_flags, i, header_idx,
766 int key_frame = !!(pkt->flags & AV_PKT_FLAG_KEY);
771 av_log(s, AV_LOG_ERROR,
772 "Negative pts not supported stream %d, pts %"PRId64"\n",
773 pkt->stream_index, pkt->pts);
774 return AVERROR_INVALIDDATA;
777 if (1LL << (20 + 3 * nut->header_count) <= avio_tell(bc))
778 write_headers(s, bc);
780 if (key_frame && !(nus->last_flags & FLAG_KEY))
783 if (pkt->size + 30 /*FIXME check*/ + avio_tell(bc) >=
784 nut->last_syncpoint_pos + nut->max_distance)
787 //FIXME: Ensure store_sp is 1 in the first place.
790 Syncpoint *sp, dummy = { .pos = INT64_MAX };
792 ff_nut_reset_ts(nut, *nus->time_base, pkt->dts);
793 for (i = 0; i < s->nb_streams; i++) {
794 AVStream *st = s->streams[i];
795 int64_t dts_tb = av_rescale_rnd(pkt->dts,
796 nus->time_base->num * (int64_t)nut->stream[i].time_base->den,
797 nus->time_base->den * (int64_t)nut->stream[i].time_base->num,
799 int index = av_index_search_timestamp(st, dts_tb,
800 AVSEEK_FLAG_BACKWARD);
802 dummy.pos = FFMIN(dummy.pos, st->index_entries[index].pos);
804 if (dummy.pos == INT64_MAX)
806 sp = av_tree_find(nut->syncpoints, &dummy, (void *)ff_nut_sp_pos_cmp,
809 nut->last_syncpoint_pos = avio_tell(bc);
810 ret = avio_open_dyn_buf(&dyn_bc);
813 put_tt(nut, nus->time_base, dyn_bc, pkt->dts);
814 ff_put_v(dyn_bc, sp ? (nut->last_syncpoint_pos - sp->pos) >> 4 : 0);
815 put_packet(nut, bc, dyn_bc, 1, SYNCPOINT_STARTCODE);
817 ff_nut_add_sp(nut, nut->last_syncpoint_pos, 0 /*unused*/, pkt->dts);
819 assert(nus->last_pts != AV_NOPTS_VALUE);
821 coded_pts = pkt->pts & ((1 << nus->msb_pts_shift) - 1);
822 if (ff_lsb2full(nus, coded_pts) != pkt->pts)
823 coded_pts = pkt->pts + (1 << nus->msb_pts_shift);
825 best_header_idx = find_best_header_idx(nut, pkt);
827 best_length = INT_MAX;
829 for (i = 0; i < 256; i++) {
831 FrameCode *fc = &nut->frame_code[i];
832 int flags = fc->flags;
834 if (flags & FLAG_INVALID)
836 needed_flags = get_needed_flags(nut, nus, fc, pkt);
838 if (flags & FLAG_CODED) {
840 flags = needed_flags;
843 if ((flags & needed_flags) != needed_flags)
846 if ((flags ^ needed_flags) & FLAG_KEY)
849 if (flags & FLAG_STREAM_ID)
850 length += ff_get_v_length(pkt->stream_index);
852 if (pkt->size % fc->size_mul != fc->size_lsb)
854 if (flags & FLAG_SIZE_MSB)
855 length += ff_get_v_length(pkt->size / fc->size_mul);
857 if (flags & FLAG_CHECKSUM)
860 if (flags & FLAG_CODED_PTS)
861 length += ff_get_v_length(coded_pts);
863 if ((flags & FLAG_CODED)
864 && nut->header_len[best_header_idx] >
865 nut->header_len[fc->header_idx] + 1) {
866 flags |= FLAG_HEADER_IDX;
869 if (flags & FLAG_HEADER_IDX) {
870 length += 1 - nut->header_len[best_header_idx];
872 length -= nut->header_len[fc->header_idx];
876 length += !(flags & FLAG_CODED_PTS);
877 length += !(flags & FLAG_CHECKSUM);
879 if (length < best_length) {
880 best_length = length;
884 assert(frame_code != -1);
885 fc = &nut->frame_code[frame_code];
887 needed_flags = get_needed_flags(nut, nus, fc, pkt);
888 header_idx = fc->header_idx;
890 ffio_init_checksum(bc, ff_crc04C11DB7_update, 0);
891 avio_w8(bc, frame_code);
892 if (flags & FLAG_CODED) {
893 ff_put_v(bc, (flags ^ needed_flags) & ~(FLAG_CODED));
894 flags = needed_flags;
896 if (flags & FLAG_STREAM_ID)
897 ff_put_v(bc, pkt->stream_index);
898 if (flags & FLAG_CODED_PTS)
899 ff_put_v(bc, coded_pts);
900 if (flags & FLAG_SIZE_MSB)
901 ff_put_v(bc, pkt->size / fc->size_mul);
902 if (flags & FLAG_HEADER_IDX)
903 ff_put_v(bc, header_idx = best_header_idx);
905 if (flags & FLAG_CHECKSUM)
906 avio_wl32(bc, ffio_get_checksum(bc));
908 ffio_get_checksum(bc);
910 avio_write(bc, pkt->data + nut->header_len[header_idx],
911 pkt->size - nut->header_len[header_idx]);
912 nus->last_flags = flags;
913 nus->last_pts = pkt->pts;
915 //FIXME just store one per syncpoint
916 if (flags & FLAG_KEY)
918 s->streams[pkt->stream_index],
919 nut->last_syncpoint_pos,
928 static int nut_write_trailer(AVFormatContext *s)
930 NUTContext *nut = s->priv_data;
931 AVIOContext *bc = s->pb;
933 while (nut->header_count < 3)
934 write_headers(s, bc);
937 av_freep(&nut->stream);
938 av_freep(&nut->chapter);
939 av_freep(&nut->time_base);
944 AVOutputFormat ff_nut_muxer = {
946 .long_name = NULL_IF_CONFIG_SMALL("NUT"),
947 .mime_type = "video/x-nut",
949 .priv_data_size = sizeof(NUTContext),
950 .audio_codec = CONFIG_LIBVORBIS ? AV_CODEC_ID_VORBIS :
951 CONFIG_LIBMP3LAME ? AV_CODEC_ID_MP3 : AV_CODEC_ID_MP2,
952 .video_codec = AV_CODEC_ID_MPEG4,
953 .write_header = nut_write_header,
954 .write_packet = nut_write_packet,
955 .write_trailer = nut_write_trailer,
956 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS,
957 .codec_tag = ff_nut_codec_tags,