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
24 #include "libavutil/intreadwrite.h"
25 #include "libavutil/mathematics.h"
26 #include "libavutil/tree.h"
27 #include "libavutil/dict.h"
28 #include "libavutil/time.h"
29 #include "libavutil/opt.h"
30 #include "libavcodec/mpegaudiodata.h"
33 #include "avio_internal.h"
36 static int find_expected_header(AVCodecParameters *p, int size, int key_frame,
39 int sample_rate = p->sample_rate;
46 if (p->codec_id == AV_CODEC_ID_MPEG4) {
53 } else if (p->codec_id == AV_CODEC_ID_MPEG1VIDEO ||
54 p->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
56 } else if (p->codec_id == AV_CODEC_ID_H264) {
58 } else if (p->codec_id == AV_CODEC_ID_MP3 ||
59 p->codec_id == AV_CODEC_ID_MP2) {
60 int lsf, mpeg25, sample_rate_index, bitrate_index, frame_size;
61 int layer = p->codec_id == AV_CODEC_ID_MP3 ? 3 : 2;
62 unsigned int header = 0xFFF00000;
64 lsf = sample_rate < (24000 + 32000) / 2;
65 mpeg25 = sample_rate < (12000 + 16000) / 2;
66 sample_rate <<= lsf + mpeg25;
67 if (sample_rate < (32000 + 44100) / 2)
68 sample_rate_index = 2;
69 else if (sample_rate < (44100 + 48000) / 2)
70 sample_rate_index = 0;
72 sample_rate_index = 1;
74 sample_rate = avpriv_mpa_freq_tab[sample_rate_index] >> (lsf + mpeg25);
76 for (bitrate_index = 2; bitrate_index < 30; bitrate_index++) {
78 avpriv_mpa_bitrate_tab[lsf][layer - 1][bitrate_index >> 1];
79 frame_size = (frame_size * 144000) / (sample_rate << lsf) +
82 if (frame_size == size)
86 header |= (!lsf) << 19;
87 header |= (4 - layer) << 17;
88 header |= 1 << 16; //no crc
91 return 2; //we guess there is no crc, if there is one the user clearly does not care about overhead
92 if (bitrate_index == 30)
93 return -1; //something is wrong ...
95 header |= (bitrate_index >> 1) << 12;
96 header |= sample_rate_index << 10;
97 header |= (bitrate_index & 1) << 9;
99 return 2; //FIXME actually put the needed ones in build_elision_headers()
100 //return 3; //we guess that the private bit is not set
101 //FIXME the above assumptions should be checked, if these turn out false too often something should be done
106 static int find_header_idx(AVFormatContext *s, AVCodecParameters *p, int size,
109 NUTContext *nut = s->priv_data;
112 int len = find_expected_header(p, size, frame_type, out);
114 for (i = 1; i < nut->header_count; i++) {
115 if (len == nut->header_len[i] && !memcmp(out, nut->header[i], len)) {
123 static void build_elision_headers(AVFormatContext *s)
125 NUTContext *nut = s->priv_data;
128 //FIXME write a 2pass mode to find the maximal headers
129 static const uint8_t headers[][5] = {
130 { 3, 0x00, 0x00, 0x01 },
131 { 4, 0x00, 0x00, 0x01, 0xB6},
132 { 2, 0xFF, 0xFA }, //mp3+crc
133 { 2, 0xFF, 0xFB }, //mp3
134 { 2, 0xFF, 0xFC }, //mp2+crc
135 { 2, 0xFF, 0xFD }, //mp2
138 nut->header_count = 7;
139 for (i = 1; i < nut->header_count; i++) {
140 nut->header_len[i] = headers[i - 1][0];
141 nut->header[i] = &headers[i - 1][1];
145 static void build_frame_code(AVFormatContext *s)
147 NUTContext *nut = s->priv_data;
148 int key_frame, index, pred, stream_id;
151 int keyframe_0_esc = s->nb_streams > 2;
155 ft = &nut->frame_code[start];
156 ft->flags = FLAG_CODED;
161 if (keyframe_0_esc) {
162 /* keyframe = 0 escape */
163 FrameCode *ft = &nut->frame_code[start];
164 ft->flags = FLAG_STREAM_ID | FLAG_SIZE_MSB | FLAG_CODED_PTS;
169 for (stream_id = 0; stream_id < s->nb_streams; stream_id++) {
170 int start2 = start + (end - start) * stream_id / s->nb_streams;
171 int end2 = start + (end - start) * (stream_id + 1) / s->nb_streams;
172 AVCodecParameters *par = s->streams[stream_id]->codecpar;
173 const AVCodecDescriptor *desc = avcodec_descriptor_get(par->codec_id);
174 int is_audio = par->codec_type == AVMEDIA_TYPE_AUDIO;
175 int intra_only = /*codec->intra_only || */ is_audio;
178 for (key_frame = 0; key_frame < 2; key_frame++) {
179 if (!intra_only || !keyframe_0_esc || key_frame != 0) {
180 FrameCode *ft = &nut->frame_code[start2];
181 ft->flags = FLAG_KEY * key_frame;
182 ft->flags |= FLAG_SIZE_MSB | FLAG_CODED_PTS;
183 ft->stream_id = stream_id;
186 ft->header_idx = find_header_idx(s, par, -1, key_frame);
191 key_frame = intra_only;
196 if (par->block_align > 0) {
197 frame_bytes = par->block_align;
199 int frame_size = av_get_audio_frame_duration2(par, 0);
200 frame_bytes = frame_size * (int64_t)par->bit_rate / (8 * par->sample_rate);
203 for (pts = 0; pts < 2; pts++)
204 for (pred = 0; pred < 2; pred++) {
205 FrameCode *ft = &nut->frame_code[start2];
206 ft->flags = FLAG_KEY * key_frame;
207 ft->stream_id = stream_id;
208 ft->size_mul = frame_bytes + 2;
209 ft->size_lsb = frame_bytes + pred;
211 ft->header_idx = find_header_idx(s, par, frame_bytes + pred, key_frame);
215 FrameCode *ft = &nut->frame_code[start2];
216 ft->flags = FLAG_KEY | FLAG_SIZE_MSB;
217 ft->stream_id = stream_id;
223 if (desc && desc->props & AV_CODEC_PROP_REORDER) {
230 } else if (par->codec_id == AV_CODEC_ID_VORBIS) {
240 for (pred = 0; pred < pred_count; pred++) {
241 int start3 = start2 + (end2 - start2) * pred / pred_count;
242 int end3 = start2 + (end2 - start2) * (pred + 1) / pred_count;
244 for (index = start3; index < end3; index++) {
245 FrameCode *ft = &nut->frame_code[index];
246 ft->flags = FLAG_KEY * key_frame;
247 ft->flags |= FLAG_SIZE_MSB;
248 ft->stream_id = stream_id;
249 //FIXME use single byte size and pred from last
250 ft->size_mul = end3 - start3;
251 ft->size_lsb = index - start3;
252 ft->pts_delta = pred_table[pred];
254 ft->header_idx = find_header_idx(s, par, -1, key_frame);
258 memmove(&nut->frame_code['N' + 1], &nut->frame_code['N'],
259 sizeof(FrameCode) * (255 - 'N'));
260 nut->frame_code[0].flags =
261 nut->frame_code[255].flags =
262 nut->frame_code['N'].flags = FLAG_INVALID;
265 static void put_tt(NUTContext *nut, AVRational *time_base, AVIOContext *bc,
268 val *= nut->time_base_count;
269 val += time_base - nut->time_base;
273 * Store a string as vb.
275 static void put_str(AVIOContext *bc, const char *string)
277 int len = strlen(string);
280 avio_write(bc, string, len);
283 static void put_s(AVIOContext *bc, int64_t val)
285 ff_put_v(bc, 2 * FFABS(val) - (val > 0));
288 //FIXME remove calculate_checksum
289 static void put_packet(NUTContext *nut, AVIOContext *bc, AVIOContext *dyn_bc,
290 int calculate_checksum, uint64_t startcode)
292 uint8_t *dyn_buf = NULL;
293 int dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf);
294 int forw_ptr = dyn_size + 4 * calculate_checksum;
297 ffio_init_checksum(bc, ff_crc04C11DB7_update, 0);
298 avio_wb64(bc, startcode);
299 ff_put_v(bc, forw_ptr);
301 avio_wl32(bc, ffio_get_checksum(bc));
303 if (calculate_checksum)
304 ffio_init_checksum(bc, ff_crc04C11DB7_update, 0);
305 avio_write(bc, dyn_buf, dyn_size);
306 if (calculate_checksum)
307 avio_wl32(bc, ffio_get_checksum(bc));
312 static void write_mainheader(NUTContext *nut, AVIOContext *bc)
314 int i, j, tmp_pts, tmp_flags, tmp_stream, tmp_mul, tmp_size, tmp_fields,
318 ff_put_v(bc, nut->version);
319 ff_put_v(bc, nut->avf->nb_streams);
320 ff_put_v(bc, nut->max_distance);
321 ff_put_v(bc, nut->time_base_count);
323 for (i = 0; i < nut->time_base_count; i++) {
324 ff_put_v(bc, nut->time_base[i].num);
325 ff_put_v(bc, nut->time_base[i].den);
331 tmp_match = 1 - (1LL << 62);
333 for (i = 0; i < 256; ) {
337 if (tmp_pts != nut->frame_code[i].pts_delta)
339 if (tmp_mul != nut->frame_code[i].size_mul)
341 if (tmp_stream != nut->frame_code[i].stream_id)
343 if (tmp_size != nut->frame_code[i].size_lsb)
345 // if(tmp_res != nut->frame_code[i].res ) tmp_fields=5;
346 if (tmp_head_idx != nut->frame_code[i].header_idx)
349 tmp_pts = nut->frame_code[i].pts_delta;
350 tmp_flags = nut->frame_code[i].flags;
351 tmp_stream = nut->frame_code[i].stream_id;
352 tmp_mul = nut->frame_code[i].size_mul;
353 tmp_size = nut->frame_code[i].size_lsb;
354 // tmp_res = nut->frame_code[i].res;
355 tmp_head_idx = nut->frame_code[i].header_idx;
357 for (j = 0; i < 256; j++, i++) {
362 if (nut->frame_code[i].pts_delta != tmp_pts ||
363 nut->frame_code[i].flags != tmp_flags ||
364 nut->frame_code[i].stream_id != tmp_stream ||
365 nut->frame_code[i].size_mul != tmp_mul ||
366 nut->frame_code[i].size_lsb != tmp_size + j ||
367 // nut->frame_code[i].res != tmp_res ||
368 nut->frame_code[i].header_idx != tmp_head_idx)
371 if (j != tmp_mul - tmp_size)
374 ff_put_v(bc, tmp_flags);
375 ff_put_v(bc, tmp_fields);
379 ff_put_v(bc, tmp_mul);
381 ff_put_v(bc, tmp_stream);
383 ff_put_v(bc, tmp_size);
385 ff_put_v(bc, 0 /*tmp_res*/);
389 ff_put_v(bc, tmp_match);
391 ff_put_v(bc, tmp_head_idx);
393 ff_put_v(bc, nut->header_count - 1);
394 for (i = 1; i < nut->header_count; i++) {
395 ff_put_v(bc, nut->header_len[i]);
396 avio_write(bc, nut->header[i], nut->header_len[i]);
398 // flags had been effectively introduced in version 4
399 if (nut->version > NUT_STABLE_VERSION)
400 ff_put_v(bc, nut->flags);
403 static int write_streamheader(AVFormatContext *avctx, AVIOContext *bc,
406 NUTContext *nut = avctx->priv_data;
407 AVCodecParameters *par = st->codecpar;
408 const AVCodecDescriptor *desc = avcodec_descriptor_get(par->codec_id);
409 unsigned codec_tag = av_codec_get_tag(ff_nut_codec_tags, par->codec_id);
412 switch (par->codec_type) {
413 case AVMEDIA_TYPE_VIDEO:
416 case AVMEDIA_TYPE_AUDIO:
419 case AVMEDIA_TYPE_SUBTITLE:
428 if (av_codec_get_id(ff_nut_codec_tags, par->codec_tag) == par->codec_id ||
429 !codec_tag || par->codec_id == AV_CODEC_ID_RAWVIDEO)
430 codec_tag = par->codec_tag;
433 avio_wl32(bc, codec_tag);
435 av_log(avctx, AV_LOG_ERROR, "No codec tag defined for stream %d\n", i);
436 return AVERROR(EINVAL);
439 ff_put_v(bc, nut->stream[i].time_base - nut->time_base);
440 ff_put_v(bc, nut->stream[i].msb_pts_shift);
441 ff_put_v(bc, nut->stream[i].max_pts_distance);
442 ff_put_v(bc, (desc && desc->props & AV_CODEC_PROP_REORDER) ? 16 : 0);
443 avio_w8(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */
445 ff_put_v(bc, par->extradata_size);
446 avio_write(bc, par->extradata, par->extradata_size);
448 switch (par->codec_type) {
449 case AVMEDIA_TYPE_AUDIO:
450 ff_put_v(bc, par->sample_rate);
452 ff_put_v(bc, par->channels);
454 case AVMEDIA_TYPE_VIDEO:
455 ff_put_v(bc, par->width);
456 ff_put_v(bc, par->height);
458 if (st->sample_aspect_ratio.num <= 0 ||
459 st->sample_aspect_ratio.den <= 0) {
463 ff_put_v(bc, st->sample_aspect_ratio.num);
464 ff_put_v(bc, st->sample_aspect_ratio.den);
466 ff_put_v(bc, 0); /* csp type -- unknown */
474 static int add_info(AVIOContext *bc, const char *type, const char *value)
482 static int write_globalinfo(NUTContext *nut, AVIOContext *bc)
484 AVFormatContext *s = nut->avf;
485 AVDictionaryEntry *t = NULL;
487 uint8_t *dyn_buf = NULL;
488 int count = 0, dyn_size;
489 int ret = avio_open_dyn_buf(&dyn_bc);
493 while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX)))
494 count += add_info(dyn_bc, t->key, t->value);
496 ff_put_v(bc, 0); //stream_if_plus1
497 ff_put_v(bc, 0); //chapter_id
498 ff_put_v(bc, 0); //timestamp_start
499 ff_put_v(bc, 0); //length
503 dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf);
504 avio_write(bc, dyn_buf, dyn_size);
509 static int write_streaminfo(NUTContext *nut, AVIOContext *bc, int stream_id){
510 AVFormatContext *s= nut->avf;
511 AVStream* st = s->streams[stream_id];
513 uint8_t *dyn_buf=NULL;
514 int count=0, dyn_size, i;
515 int ret = avio_open_dyn_buf(&dyn_bc);
519 for (i=0; ff_nut_dispositions[i].flag; ++i) {
520 if (st->disposition & ff_nut_dispositions[i].flag)
521 count += add_info(dyn_bc, "Disposition", ff_nut_dispositions[i].str);
523 dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf);
526 ff_put_v(bc, stream_id + 1); //stream_id_plus1
527 ff_put_v(bc, 0); //chapter_id
528 ff_put_v(bc, 0); //timestamp_start
529 ff_put_v(bc, 0); //length
533 avio_write(bc, dyn_buf, dyn_size);
540 static int write_chapter(NUTContext *nut, AVIOContext *bc, int id)
543 uint8_t *dyn_buf = NULL;
544 AVDictionaryEntry *t = NULL;
545 AVChapter *ch = nut->avf->chapters[id];
546 int ret, dyn_size, count = 0;
548 ret = avio_open_dyn_buf(&dyn_bc);
552 ff_put_v(bc, 0); // stream_id_plus1
553 put_s(bc, id + 1); // chapter_id
554 put_tt(nut, nut->chapter[id].time_base, bc, ch->start); // chapter_start
555 ff_put_v(bc, ch->end - ch->start); // chapter_len
557 while ((t = av_dict_get(ch->metadata, "", t, AV_DICT_IGNORE_SUFFIX)))
558 count += add_info(dyn_bc, t->key, t->value);
562 dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf);
563 avio_write(bc, dyn_buf, dyn_size);
568 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 ret = write_streamheader(avctx, dyn_bc, nut->avf->streams[i], i);
589 put_packet(nut, bc, dyn_bc, 1, STREAM_STARTCODE);
592 ret = avio_open_dyn_buf(&dyn_bc);
595 write_globalinfo(nut, dyn_bc);
596 put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
598 for (i = 0; i < nut->avf->nb_streams; i++) {
599 ret = avio_open_dyn_buf(&dyn_bc);
602 ret = write_streaminfo(nut, dyn_bc, i);
606 put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
608 ffio_free_dyn_buf(&dyn_bc);
611 for (i = 0; i < nut->avf->nb_chapters; i++) {
612 ret = avio_open_dyn_buf(&dyn_bc);
615 ret = write_chapter(nut, dyn_bc, i);
617 ffio_free_dyn_buf(&dyn_bc);
620 put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
623 nut->last_syncpoint_pos = INT_MIN;
628 static int nut_write_header(AVFormatContext *s)
630 NUTContext *nut = s->priv_data;
631 AVIOContext *bc = s->pb;
636 nut->version = NUT_STABLE_VERSION + !!nut->flags;
637 if (nut->flags && s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) {
638 av_log(s, AV_LOG_ERROR,
639 "The additional syncpoint modes require version %d, "
640 "that is currently not finalized, "
641 "please set -f_strict experimental in order to enable it.\n",
643 return AVERROR_EXPERIMENTAL;
646 nut->stream = av_mallocz(sizeof(StreamContext) * s->nb_streams);
648 nut->chapter = av_mallocz(sizeof(ChapterContext) * s->nb_chapters);
649 nut->time_base = av_mallocz(sizeof(AVRational) * (s->nb_streams +
651 if (!nut->stream || (s->nb_chapters && !nut->chapter) || !nut->time_base) {
652 av_freep(&nut->stream);
653 av_freep(&nut->chapter);
654 av_freep(&nut->time_base);
655 return AVERROR(ENOMEM);
658 for (i = 0; i < s->nb_streams; i++) {
659 AVStream *st = s->streams[i];
661 AVRational time_base;
662 ff_parse_specific_params(st, &time_base.den, &ssize,
665 avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
667 for (j = 0; j < nut->time_base_count; j++)
668 if (!memcmp(&time_base, &nut->time_base[j], sizeof(AVRational))) {
671 nut->time_base[j] = time_base;
672 nut->stream[i].time_base = &nut->time_base[j];
673 if (j == nut->time_base_count)
674 nut->time_base_count++;
676 if (INT64_C(1000) * time_base.num >= time_base.den)
677 nut->stream[i].msb_pts_shift = 7;
679 nut->stream[i].msb_pts_shift = 14;
680 nut->stream[i].max_pts_distance =
681 FFMAX(time_base.den, time_base.num) / time_base.num;
684 for (i = 0; i < s->nb_chapters; i++) {
685 AVChapter *ch = s->chapters[i];
687 for (j = 0; j < nut->time_base_count; j++)
688 if (!memcmp(&ch->time_base, &nut->time_base[j], sizeof(AVRational)))
691 nut->time_base[j] = ch->time_base;
692 nut->chapter[i].time_base = &nut->time_base[j];
693 if (j == nut->time_base_count)
694 nut->time_base_count++;
697 nut->max_distance = MAX_DISTANCE;
698 build_elision_headers(s);
700 assert(nut->frame_code['N'].flags == FLAG_INVALID);
702 avio_write(bc, ID_STRING, strlen(ID_STRING));
705 if ((ret = write_headers(s, bc)) < 0)
715 static int get_needed_flags(NUTContext *nut, StreamContext *nus, FrameCode *fc,
720 if (pkt->flags & AV_PKT_FLAG_KEY)
722 if (pkt->stream_index != fc->stream_id)
723 flags |= FLAG_STREAM_ID;
724 if (pkt->size / fc->size_mul)
725 flags |= FLAG_SIZE_MSB;
726 if (pkt->pts - nus->last_pts != fc->pts_delta)
727 flags |= FLAG_CODED_PTS;
728 if (pkt->size > 2 * nut->max_distance)
729 flags |= FLAG_CHECKSUM;
730 if (FFABS(pkt->pts - nus->last_pts) > nus->max_pts_distance)
731 flags |= FLAG_CHECKSUM;
732 if (pkt->size < nut->header_len[fc->header_idx] ||
733 (pkt->size > 4096 && fc->header_idx) ||
734 memcmp(pkt->data, nut->header[fc->header_idx],
735 nut->header_len[fc->header_idx]))
736 flags |= FLAG_HEADER_IDX;
738 return flags | (fc->flags & FLAG_CODED);
741 static int find_best_header_idx(NUTContext *nut, AVPacket *pkt)
747 if (pkt->size > 4096)
750 for (i = 1; i < nut->header_count; i++)
751 if (pkt->size >= nut->header_len[i]
752 && nut->header_len[i] > best_len
753 && !memcmp(pkt->data, nut->header[i], nut->header_len[i])) {
755 best_len = nut->header_len[i];
760 static int nut_write_packet(AVFormatContext *s, AVPacket *pkt)
762 NUTContext *nut = s->priv_data;
763 StreamContext *nus = &nut->stream[pkt->stream_index];
764 AVIOContext *bc = s->pb, *dyn_bc;
767 int best_length, frame_code, flags, needed_flags, i, header_idx,
769 int key_frame = !!(pkt->flags & AV_PKT_FLAG_KEY);
774 av_log(s, AV_LOG_ERROR,
775 "Negative pts not supported stream %d, pts %"PRId64"\n",
776 pkt->stream_index, pkt->pts);
777 return AVERROR_INVALIDDATA;
780 if (1LL << (20 + 3 * nut->header_count) <= avio_tell(bc))
781 write_headers(s, bc);
783 if (key_frame && !(nus->last_flags & FLAG_KEY))
786 if (pkt->size + 30 /*FIXME check*/ + avio_tell(bc) >=
787 nut->last_syncpoint_pos + nut->max_distance)
790 //FIXME: Ensure store_sp is 1 in the first place.
793 (!(nut->flags & NUT_PIPE) || nut->last_syncpoint_pos == INT_MIN)) {
794 Syncpoint *sp, dummy = { .pos = INT64_MAX };
796 ff_nut_reset_ts(nut, *nus->time_base, pkt->dts);
797 for (i = 0; i < s->nb_streams; i++) {
798 AVStream *st = s->streams[i];
799 int64_t dts_tb = av_rescale_rnd(pkt->dts,
800 nus->time_base->num * (int64_t)nut->stream[i].time_base->den,
801 nus->time_base->den * (int64_t)nut->stream[i].time_base->num,
803 int index = av_index_search_timestamp(st, dts_tb,
804 AVSEEK_FLAG_BACKWARD);
806 dummy.pos = FFMIN(dummy.pos, st->index_entries[index].pos);
808 if (dummy.pos == INT64_MAX)
810 sp = av_tree_find(nut->syncpoints, &dummy,
811 (int (*)(void *, const void *)) ff_nut_sp_pos_cmp,
814 nut->last_syncpoint_pos = avio_tell(bc);
815 ret = avio_open_dyn_buf(&dyn_bc);
818 put_tt(nut, nus->time_base, dyn_bc, pkt->dts);
819 ff_put_v(dyn_bc, sp ? (nut->last_syncpoint_pos - sp->pos) >> 4 : 0);
821 if (nut->flags & NUT_BROADCAST) {
822 put_tt(nut, nus->time_base, dyn_bc,
823 av_rescale_q(av_gettime(), AV_TIME_BASE_Q, *nus->time_base));
825 put_packet(nut, bc, dyn_bc, 1, SYNCPOINT_STARTCODE);
827 if ((ret = ff_nut_add_sp(nut, nut->last_syncpoint_pos, 0 /*unused*/, pkt->dts)) < 0)
830 assert(nus->last_pts != AV_NOPTS_VALUE);
832 coded_pts = pkt->pts & ((1 << nus->msb_pts_shift) - 1);
833 if (ff_lsb2full(nus, coded_pts) != pkt->pts)
834 coded_pts = pkt->pts + (1 << nus->msb_pts_shift);
836 best_header_idx = find_best_header_idx(nut, pkt);
838 best_length = INT_MAX;
840 for (i = 0; i < 256; i++) {
842 FrameCode *fc = &nut->frame_code[i];
843 int flags = fc->flags;
845 if (flags & FLAG_INVALID)
847 needed_flags = get_needed_flags(nut, nus, fc, pkt);
849 if (flags & FLAG_CODED) {
851 flags = needed_flags;
854 if ((flags & needed_flags) != needed_flags)
857 if ((flags ^ needed_flags) & FLAG_KEY)
860 if (flags & FLAG_STREAM_ID)
861 length += ff_get_v_length(pkt->stream_index);
863 if (pkt->size % fc->size_mul != fc->size_lsb)
865 if (flags & FLAG_SIZE_MSB)
866 length += ff_get_v_length(pkt->size / fc->size_mul);
868 if (flags & FLAG_CHECKSUM)
871 if (flags & FLAG_CODED_PTS)
872 length += ff_get_v_length(coded_pts);
874 if ((flags & FLAG_CODED)
875 && nut->header_len[best_header_idx] >
876 nut->header_len[fc->header_idx] + 1) {
877 flags |= FLAG_HEADER_IDX;
880 if (flags & FLAG_HEADER_IDX) {
881 length += 1 - nut->header_len[best_header_idx];
883 length -= nut->header_len[fc->header_idx];
887 length += !(flags & FLAG_CODED_PTS);
888 length += !(flags & FLAG_CHECKSUM);
890 if (length < best_length) {
891 best_length = length;
899 fc = &nut->frame_code[frame_code];
901 needed_flags = get_needed_flags(nut, nus, fc, pkt);
902 header_idx = fc->header_idx;
904 ffio_init_checksum(bc, ff_crc04C11DB7_update, 0);
905 avio_w8(bc, frame_code);
906 if (flags & FLAG_CODED) {
907 ff_put_v(bc, (flags ^ needed_flags) & ~(FLAG_CODED));
908 flags = needed_flags;
910 if (flags & FLAG_STREAM_ID)
911 ff_put_v(bc, pkt->stream_index);
912 if (flags & FLAG_CODED_PTS)
913 ff_put_v(bc, coded_pts);
914 if (flags & FLAG_SIZE_MSB)
915 ff_put_v(bc, pkt->size / fc->size_mul);
916 if (flags & FLAG_HEADER_IDX)
917 ff_put_v(bc, header_idx = best_header_idx);
919 if (flags & FLAG_CHECKSUM)
920 avio_wl32(bc, ffio_get_checksum(bc));
922 ffio_get_checksum(bc);
924 avio_write(bc, pkt->data + nut->header_len[header_idx],
925 pkt->size - nut->header_len[header_idx]);
926 nus->last_flags = flags;
927 nus->last_pts = pkt->pts;
929 //FIXME just store one per syncpoint
930 if (flags & FLAG_KEY && !(nut->flags & NUT_PIPE))
932 s->streams[pkt->stream_index],
933 nut->last_syncpoint_pos,
942 static int nut_write_trailer(AVFormatContext *s)
944 NUTContext *nut = s->priv_data;
945 AVIOContext *bc = s->pb;
947 while (nut->header_count < 3)
948 write_headers(s, bc);
951 av_freep(&nut->stream);
952 av_freep(&nut->chapter);
953 av_freep(&nut->time_base);
958 #define OFFSET(x) offsetof(NUTContext, x)
959 #define E AV_OPT_FLAG_ENCODING_PARAM
960 static const AVOption options[] = {
961 { "syncpoints", "NUT syncpoint behaviour", OFFSET(flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, INT_MIN, INT_MAX, E, "syncpoints" },
962 { "default", "", 0, AV_OPT_TYPE_CONST, {.i64 = 0}, INT_MIN, INT_MAX, E, "syncpoints" },
963 { "none", "Disable syncpoints, low overhead and unseekable", 0, AV_OPT_TYPE_CONST, {.i64 = NUT_PIPE}, INT_MIN, INT_MAX, E, "syncpoints" },
964 { "timestamped", "Extend syncpoints with a wallclock timestamp", 0, AV_OPT_TYPE_CONST, {.i64 = NUT_BROADCAST}, INT_MIN, INT_MAX, E, "syncpoints" },
968 static const AVClass class = {
969 .class_name = "nutenc",
970 .item_name = av_default_item_name,
972 .version = LIBAVUTIL_VERSION_INT,
975 AVOutputFormat ff_nut_muxer = {
977 .long_name = NULL_IF_CONFIG_SMALL("NUT"),
978 .mime_type = "video/x-nut",
980 .priv_data_size = sizeof(NUTContext),
981 .audio_codec = CONFIG_LIBVORBIS ? AV_CODEC_ID_VORBIS :
982 CONFIG_LIBMP3LAME ? AV_CODEC_ID_MP3 : AV_CODEC_ID_MP2,
983 .video_codec = AV_CODEC_ID_MPEG4,
984 .write_header = nut_write_header,
985 .write_packet = nut_write_packet,
986 .write_trailer = nut_write_trailer,
987 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS,
988 .codec_tag = ff_nut_codec_tags,
989 .priv_class = &class,