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
24 #include "libavutil/intreadwrite.h"
25 #include "libavutil/mathematics.h"
26 #include "libavutil/tree.h"
27 #include "libavutil/dict.h"
28 #include "libavutil/avassert.h"
29 #include "libavutil/time.h"
30 #include "libavutil/opt.h"
31 #include "libavcodec/bytestream.h"
32 #include "libavcodec/mpegaudiodata.h"
35 #include "avio_internal.h"
38 static int find_expected_header(AVCodecParameters *p, int size, int key_frame,
41 int sample_rate = p->sample_rate;
48 if (p->codec_id == AV_CODEC_ID_MPEG4) {
55 } else if (p->codec_id == AV_CODEC_ID_MPEG1VIDEO ||
56 p->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
58 } else if (p->codec_id == AV_CODEC_ID_H264) {
60 } else if (p->codec_id == AV_CODEC_ID_MP3 ||
61 p->codec_id == AV_CODEC_ID_MP2) {
62 int lsf, mpeg25, sample_rate_index, bitrate_index, frame_size;
63 int layer = p->codec_id == AV_CODEC_ID_MP3 ? 3 : 2;
64 unsigned int header = 0xFFF00000;
66 lsf = sample_rate < (24000 + 32000) / 2;
67 mpeg25 = sample_rate < (12000 + 16000) / 2;
68 sample_rate <<= lsf + mpeg25;
69 if (sample_rate < (32000 + 44100) / 2) sample_rate_index = 2;
70 else if (sample_rate < (44100 + 48000) / 2) sample_rate_index = 0;
71 else sample_rate_index = 1;
73 sample_rate = avpriv_mpa_freq_tab[sample_rate_index] >> (lsf + mpeg25);
75 for (bitrate_index = 2; bitrate_index < 30; bitrate_index++) {
77 avpriv_mpa_bitrate_tab[lsf][layer - 1][bitrate_index >> 1];
78 frame_size = (frame_size * 144000) / (sample_rate << lsf) +
81 if (frame_size == size)
85 header |= (!lsf) << 19;
86 header |= (4 - layer) << 17;
87 header |= 1 << 16; //no crc
90 return 2; //we guess there is no crc, if there is one the user clearly does not care about overhead
91 if (bitrate_index == 30)
92 return -1; //something is wrong ...
94 header |= (bitrate_index >> 1) << 12;
95 header |= sample_rate_index << 10;
96 header |= (bitrate_index & 1) << 9;
98 return 2; //FIXME actually put the needed ones in build_elision_headers()
99 //return 3; //we guess that the private bit is not set
100 //FIXME the above assumptions should be checked, if these turn out false too often something should be done
105 static int find_header_idx(AVFormatContext *s, AVCodecParameters *p, int size,
108 NUTContext *nut = s->priv_data;
111 int len = find_expected_header(p, size, frame_type, out);
113 for (i = 1; i < nut->header_count; i++) {
114 if (len == nut->header_len[i] && !memcmp(out, nut->header[i], len)) {
122 static void build_elision_headers(AVFormatContext *s)
124 NUTContext *nut = s->priv_data;
127 //FIXME write a 2pass mode to find the maximal headers
128 static const uint8_t headers[][5] = {
129 { 3, 0x00, 0x00, 0x01 },
130 { 4, 0x00, 0x00, 0x01, 0xB6},
131 { 2, 0xFF, 0xFA }, //mp3+crc
132 { 2, 0xFF, 0xFB }, //mp3
133 { 2, 0xFF, 0xFC }, //mp2+crc
134 { 2, 0xFF, 0xFD }, //mp2
137 nut->header_count = 7;
138 for (i = 1; i < nut->header_count; i++) {
139 nut->header_len[i] = headers[i - 1][0];
140 nut->header[i] = &headers[i - 1][1];
144 static void build_frame_code(AVFormatContext *s)
146 NUTContext *nut = s->priv_data;
147 int key_frame, index, pred, stream_id;
150 int keyframe_0_esc = s->nb_streams > 2;
154 ft = &nut->frame_code[start];
155 ft->flags = FLAG_CODED;
160 if (keyframe_0_esc) {
161 /* keyframe = 0 escape */
162 FrameCode *ft = &nut->frame_code[start];
163 ft->flags = FLAG_STREAM_ID | FLAG_SIZE_MSB | FLAG_CODED_PTS;
168 for (stream_id = 0; stream_id < s->nb_streams; stream_id++) {
169 int start2 = start + (end - start) * stream_id / s->nb_streams;
170 int end2 = start + (end - start) * (stream_id + 1) / s->nb_streams;
171 AVCodecParameters *par = s->streams[stream_id]->codecpar;
172 int is_audio = par->codec_type == AVMEDIA_TYPE_AUDIO;
173 int intra_only = /*codec->intra_only || */ is_audio;
177 if (par->codec_type == AVMEDIA_TYPE_AUDIO) {
178 frame_size = av_get_audio_frame_duration2(par, 0);
179 if (par->codec_id == AV_CODEC_ID_VORBIS && !frame_size)
182 AVRational f = av_div_q(av_inv_q(s->streams[stream_id]->avg_frame_rate), *nut->stream[stream_id].time_base);
183 if (f.den == 1 && f.num>0)
189 for (key_frame = 0; key_frame < 2; key_frame++) {
190 if (!intra_only || !keyframe_0_esc || key_frame != 0) {
191 FrameCode *ft = &nut->frame_code[start2];
192 ft->flags = FLAG_KEY * key_frame;
193 ft->flags |= FLAG_SIZE_MSB | FLAG_CODED_PTS;
194 ft->stream_id = stream_id;
197 ft->header_idx = find_header_idx(s, par, -1, key_frame);
202 key_frame = intra_only;
208 if (par->block_align > 0) {
209 frame_bytes = par->block_align;
211 int frame_size = av_get_audio_frame_duration2(par, 0);
212 frame_bytes = frame_size * (int64_t)par->bit_rate / (8 * par->sample_rate);
215 for (pts = 0; pts < 2; pts++) {
216 for (pred = 0; pred < 2; pred++) {
217 FrameCode *ft = &nut->frame_code[start2];
218 ft->flags = FLAG_KEY * key_frame;
219 ft->stream_id = stream_id;
220 ft->size_mul = frame_bytes + 2;
221 ft->size_lsb = frame_bytes + pred;
222 ft->pts_delta = pts * frame_size;
223 ft->header_idx = find_header_idx(s, par, frame_bytes + pred, key_frame);
228 FrameCode *ft = &nut->frame_code[start2];
229 ft->flags = FLAG_KEY | FLAG_SIZE_MSB;
230 ft->stream_id = stream_id;
232 ft->pts_delta = frame_size;
237 if (par->video_delay) {
244 } else if (par->codec_id == AV_CODEC_ID_VORBIS) {
254 for (pred = 0; pred < pred_count; pred++) {
255 int start3 = start2 + (end2 - start2) * pred / pred_count;
256 int end3 = start2 + (end2 - start2) * (pred + 1) / pred_count;
258 pred_table[pred] *= frame_size;
260 for (index = start3; index < end3; index++) {
261 FrameCode *ft = &nut->frame_code[index];
262 ft->flags = FLAG_KEY * key_frame;
263 ft->flags |= FLAG_SIZE_MSB;
264 ft->stream_id = stream_id;
265 //FIXME use single byte size and pred from last
266 ft->size_mul = end3 - start3;
267 ft->size_lsb = index - start3;
268 ft->pts_delta = pred_table[pred];
270 ft->header_idx = find_header_idx(s, par, -1, key_frame);
274 memmove(&nut->frame_code['N' + 1], &nut->frame_code['N'], sizeof(FrameCode) * (255 - 'N'));
275 nut->frame_code[0].flags =
276 nut->frame_code[255].flags =
277 nut->frame_code['N'].flags = FLAG_INVALID;
280 static void put_tt(NUTContext *nut, AVRational *time_base, AVIOContext *bc, uint64_t val)
282 val *= nut->time_base_count;
283 val += time_base - nut->time_base;
287 * Store a string as vb.
289 static void put_str(AVIOContext *bc, const char *string)
291 size_t len = strlen(string);
294 avio_write(bc, string, len);
297 static void put_s(AVIOContext *bc, int64_t val)
299 ff_put_v(bc, 2 * FFABS(val) - (val > 0));
302 static void put_packet(NUTContext *nut, AVIOContext *bc, AVIOContext *dyn_bc,
305 uint8_t *dyn_buf = NULL;
306 int dyn_size = avio_get_dyn_buf(dyn_bc, &dyn_buf);
307 int forw_ptr = dyn_size + 4;
310 ffio_init_checksum(bc, ff_crc04C11DB7_update, 0);
311 avio_wb64(bc, startcode);
312 ff_put_v(bc, forw_ptr);
314 avio_wl32(bc, ffio_get_checksum(bc));
316 ffio_init_checksum(bc, ff_crc04C11DB7_update, 0);
317 avio_write(bc, dyn_buf, dyn_size);
318 avio_wl32(bc, ffio_get_checksum(bc));
320 ffio_reset_dyn_buf(dyn_bc);
323 static void write_mainheader(NUTContext *nut, AVIOContext *bc)
325 int i, j, tmp_pts, tmp_flags, tmp_stream, tmp_mul, tmp_size, tmp_fields,
329 ff_put_v(bc, nut->version);
330 if (nut->version > 3)
331 ff_put_v(bc, nut->minor_version = 1);
332 ff_put_v(bc, nut->avf->nb_streams);
333 ff_put_v(bc, nut->max_distance);
334 ff_put_v(bc, nut->time_base_count);
336 for (i = 0; i < nut->time_base_count; i++) {
337 ff_put_v(bc, nut->time_base[i].num);
338 ff_put_v(bc, nut->time_base[i].den);
344 tmp_match = 1 - (1LL << 62);
346 for (i = 0; i < 256; ) {
350 if (tmp_pts != nut->frame_code[i].pts_delta ) tmp_fields = 1;
351 if (tmp_mul != nut->frame_code[i].size_mul ) tmp_fields = 2;
352 if (tmp_stream != nut->frame_code[i].stream_id ) tmp_fields = 3;
353 if (tmp_size != nut->frame_code[i].size_lsb ) tmp_fields = 4;
354 // if (tmp_res != nut->frame_code[i].res ) tmp_fields=5;
355 if (tmp_head_idx != nut->frame_code[i].header_idx) tmp_fields = 8;
357 tmp_pts = nut->frame_code[i].pts_delta;
358 tmp_flags = nut->frame_code[i].flags;
359 tmp_stream = nut->frame_code[i].stream_id;
360 tmp_mul = nut->frame_code[i].size_mul;
361 tmp_size = nut->frame_code[i].size_lsb;
362 // tmp_res = nut->frame_code[i].res;
363 tmp_head_idx = nut->frame_code[i].header_idx;
365 for (j = 0; i < 256; j++, i++) {
370 if (nut->frame_code[i].pts_delta != tmp_pts ||
371 nut->frame_code[i].flags != tmp_flags ||
372 nut->frame_code[i].stream_id != tmp_stream ||
373 nut->frame_code[i].size_mul != tmp_mul ||
374 nut->frame_code[i].size_lsb != tmp_size + j ||
375 // nut->frame_code[i].res != tmp_res ||
376 nut->frame_code[i].header_idx != tmp_head_idx)
379 if (j != tmp_mul - tmp_size)
382 ff_put_v(bc, tmp_flags);
383 ff_put_v(bc, tmp_fields);
384 if (tmp_fields > 0) put_s(bc, tmp_pts);
385 if (tmp_fields > 1) ff_put_v(bc, tmp_mul);
386 if (tmp_fields > 2) ff_put_v(bc, tmp_stream);
387 if (tmp_fields > 3) ff_put_v(bc, tmp_size);
388 if (tmp_fields > 4) ff_put_v(bc, 0 /*tmp_res*/);
389 if (tmp_fields > 5) ff_put_v(bc, j);
390 if (tmp_fields > 6) ff_put_v(bc, tmp_match);
391 if (tmp_fields > 7) 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 > 3)
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;
410 switch (par->codec_type) {
411 case AVMEDIA_TYPE_VIDEO: ff_put_v(bc, 0); break;
412 case AVMEDIA_TYPE_AUDIO: ff_put_v(bc, 1); break;
413 case AVMEDIA_TYPE_SUBTITLE: ff_put_v(bc, 2); break;
414 default: ff_put_v(bc, 3); break;
418 if (par->codec_tag) {
419 avio_wl32(bc, par->codec_tag);
421 av_log(avctx, AV_LOG_ERROR, "No codec tag defined for stream %d\n", i);
422 return AVERROR(EINVAL);
425 ff_put_v(bc, nut->stream[i].time_base - nut->time_base);
426 ff_put_v(bc, nut->stream[i].msb_pts_shift);
427 ff_put_v(bc, nut->stream[i].max_pts_distance);
428 ff_put_v(bc, par->video_delay);
429 avio_w8(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */
431 ff_put_v(bc, par->extradata_size);
432 avio_write(bc, par->extradata, par->extradata_size);
434 switch (par->codec_type) {
435 case AVMEDIA_TYPE_AUDIO:
436 ff_put_v(bc, par->sample_rate);
438 ff_put_v(bc, par->channels);
440 case AVMEDIA_TYPE_VIDEO:
441 ff_put_v(bc, par->width);
442 ff_put_v(bc, par->height);
444 if (st->sample_aspect_ratio.num <= 0 ||
445 st->sample_aspect_ratio.den <= 0) {
449 ff_put_v(bc, st->sample_aspect_ratio.num);
450 ff_put_v(bc, st->sample_aspect_ratio.den);
452 ff_put_v(bc, 0); /* csp type -- unknown */
460 static int add_info(AVIOContext *bc, const char *type, const char *value)
468 static int write_globalinfo(NUTContext *nut, AVIOContext *bc)
470 AVFormatContext *s = nut->avf;
471 AVDictionaryEntry *t = NULL;
473 uint8_t *dyn_buf = NULL;
474 int count = 0, dyn_size;
475 int ret = avio_open_dyn_buf(&dyn_bc);
479 ff_standardize_creation_time(s);
480 while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX)))
481 count += add_info(dyn_bc, t->key, t->value);
483 ff_put_v(bc, 0); //stream_if_plus1
484 ff_put_v(bc, 0); //chapter_id
485 ff_put_v(bc, 0); //timestamp_start
486 ff_put_v(bc, 0); //length
490 dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf);
491 avio_write(bc, dyn_buf, dyn_size);
496 static int write_streaminfo(NUTContext *nut, AVIOContext *bc, int stream_id) {
497 AVFormatContext *s= nut->avf;
498 AVStream* st = s->streams[stream_id];
499 AVDictionaryEntry *t = NULL;
501 uint8_t *dyn_buf=NULL;
502 int count=0, dyn_size, i;
503 int ret = avio_open_dyn_buf(&dyn_bc);
507 while ((t = av_dict_get(st->metadata, "", t, AV_DICT_IGNORE_SUFFIX)))
508 count += add_info(dyn_bc, t->key, t->value);
509 for (i=0; ff_nut_dispositions[i].flag; ++i) {
510 if (st->disposition & ff_nut_dispositions[i].flag)
511 count += add_info(dyn_bc, "Disposition", ff_nut_dispositions[i].str);
513 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
515 if (st->r_frame_rate.num>0 && st->r_frame_rate.den>0)
516 snprintf(buf, sizeof(buf), "%d/%d", st->r_frame_rate.num, st->r_frame_rate.den);
518 snprintf(buf, sizeof(buf), "%d/%d", st->avg_frame_rate.num, st->avg_frame_rate.den);
519 count += add_info(dyn_bc, "r_frame_rate", buf);
521 dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf);
524 ff_put_v(bc, stream_id + 1); //stream_id_plus1
525 ff_put_v(bc, 0); //chapter_id
526 ff_put_v(bc, 0); //timestamp_start
527 ff_put_v(bc, 0); //length
531 avio_write(bc, dyn_buf, dyn_size);
538 static int write_chapter(NUTContext *nut, AVIOContext *bc, int id)
541 uint8_t *dyn_buf = NULL;
542 AVDictionaryEntry *t = NULL;
543 AVChapter *ch = nut->avf->chapters[id];
544 int ret, dyn_size, count = 0;
546 ret = avio_open_dyn_buf(&dyn_bc);
550 ff_put_v(bc, 0); // stream_id_plus1
551 put_s(bc, id + 1); // chapter_id
552 put_tt(nut, nut->chapter[id].time_base, bc, ch->start); // chapter_start
553 ff_put_v(bc, ch->end - ch->start); // chapter_len
555 while ((t = av_dict_get(ch->metadata, "", t, AV_DICT_IGNORE_SUFFIX)))
556 count += add_info(dyn_bc, t->key, t->value);
560 dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf);
561 avio_write(bc, dyn_buf, dyn_size);
566 static int write_index(NUTContext *nut, AVIOContext *bc) {
568 Syncpoint dummy= { .pos= 0 };
569 Syncpoint *next_node[2] = { NULL };
570 int64_t startpos = avio_tell(bc);
571 int64_t payload_size;
573 put_tt(nut, nut->max_pts_tb, bc, nut->max_pts);
575 ff_put_v(bc, nut->sp_count);
577 for (i=0; i<nut->sp_count; i++) {
578 av_tree_find(nut->syncpoints, &dummy, ff_nut_sp_pos_cmp, (void**)next_node);
579 ff_put_v(bc, (next_node[1]->pos >> 4) - (dummy.pos>>4));
580 dummy.pos = next_node[1]->pos;
583 for (i=0; i<nut->avf->nb_streams; i++) {
584 StreamContext *nus= &nut->stream[i];
585 int64_t last_pts= -1;
587 for (j=0; j<nut->sp_count; j++) {
591 if (j && nus->keyframe_pts[j] == nus->keyframe_pts[j-1]) {
592 av_log(nut->avf, AV_LOG_WARNING, "Multiple keyframes with same PTS\n");
593 nus->keyframe_pts[j] = AV_NOPTS_VALUE;
596 flag = (nus->keyframe_pts[j] != AV_NOPTS_VALUE) ^ (j+1 == nut->sp_count);
597 for (; j<nut->sp_count && (nus->keyframe_pts[j] != AV_NOPTS_VALUE) == flag; j++)
600 ff_put_v(bc, 1 + 2*flag + 4*n);
601 for (k= j - n; k<=j && k<nut->sp_count; k++) {
602 if (nus->keyframe_pts[k] == AV_NOPTS_VALUE)
604 av_assert0(nus->keyframe_pts[k] > last_pts);
605 ff_put_v(bc, nus->keyframe_pts[k] - last_pts);
606 last_pts = nus->keyframe_pts[k];
611 payload_size = avio_tell(bc) - startpos + 8 + 4;
613 avio_wb64(bc, 8 + payload_size + av_log2(payload_size) / 7 + 1 + 4*(payload_size > 4096));
618 static int write_headers(AVFormatContext *avctx, AVIOContext *bc)
620 NUTContext *nut = avctx->priv_data;
624 ff_metadata_conv_ctx(avctx, ff_nut_metadata_conv, NULL);
626 ret = avio_open_dyn_buf(&dyn_bc);
629 write_mainheader(nut, dyn_bc);
630 put_packet(nut, bc, dyn_bc, MAIN_STARTCODE);
632 for (i = 0; i < nut->avf->nb_streams; i++) {
633 ret = write_streamheader(avctx, dyn_bc, nut->avf->streams[i], i);
637 put_packet(nut, bc, dyn_bc, STREAM_STARTCODE);
640 write_globalinfo(nut, dyn_bc);
641 put_packet(nut, bc, dyn_bc, INFO_STARTCODE);
643 for (i = 0; i < nut->avf->nb_streams; i++) {
644 ret = write_streaminfo(nut, dyn_bc, i);
646 put_packet(nut, bc, dyn_bc, INFO_STARTCODE);
652 for (i = 0; i < nut->avf->nb_chapters; i++) {
653 ret = write_chapter(nut, dyn_bc, i);
657 put_packet(nut, bc, dyn_bc, INFO_STARTCODE);
660 nut->last_syncpoint_pos = INT_MIN;
665 ffio_free_dyn_buf(&dyn_bc);
670 static int nut_write_header(AVFormatContext *s)
672 NUTContext *nut = s->priv_data;
673 AVIOContext *bc = s->pb;
678 nut->version = FFMAX(NUT_STABLE_VERSION, 3 + !!nut->flags);
679 if (nut->version > 3 && s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) {
680 av_log(s, AV_LOG_ERROR,
681 "The additional syncpoint modes require version %d, "
682 "that is currently not finalized, "
683 "please set -f_strict experimental in order to enable it.\n",
685 return AVERROR_EXPERIMENTAL;
688 nut->stream = av_calloc(s->nb_streams, sizeof(*nut->stream ));
689 nut->chapter = av_calloc(s->nb_chapters, sizeof(*nut->chapter));
690 nut->time_base= av_calloc(s->nb_streams +
691 s->nb_chapters, sizeof(*nut->time_base));
692 if (!nut->stream || !nut->chapter || !nut->time_base)
693 return AVERROR(ENOMEM);
695 for (i = 0; i < s->nb_streams; i++) {
696 AVStream *st = s->streams[i];
698 AVRational time_base;
699 ff_parse_specific_params(st, &time_base.den, &ssize, &time_base.num);
701 if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && st->codecpar->sample_rate) {
702 time_base = (AVRational) {1, st->codecpar->sample_rate};
704 time_base = ff_choose_timebase(s, st, 48000);
707 avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
709 for (j = 0; j < nut->time_base_count; j++)
710 if (!memcmp(&time_base, &nut->time_base[j], sizeof(AVRational))) {
713 nut->time_base[j] = time_base;
714 nut->stream[i].time_base = &nut->time_base[j];
715 if (j == nut->time_base_count)
716 nut->time_base_count++;
718 if (INT64_C(1000) * time_base.num >= time_base.den)
719 nut->stream[i].msb_pts_shift = 7;
721 nut->stream[i].msb_pts_shift = 14;
722 nut->stream[i].max_pts_distance =
723 FFMAX(time_base.den, time_base.num) / time_base.num;
726 for (i = 0; i < s->nb_chapters; i++) {
727 AVChapter *ch = s->chapters[i];
729 for (j = 0; j < nut->time_base_count; j++)
730 if (!memcmp(&ch->time_base, &nut->time_base[j], sizeof(AVRational)))
733 nut->time_base[j] = ch->time_base;
734 nut->chapter[i].time_base = &nut->time_base[j];
735 if (j == nut->time_base_count)
736 nut->time_base_count++;
739 nut->max_distance = MAX_DISTANCE;
740 build_elision_headers(s);
742 av_assert0(nut->frame_code['N'].flags == FLAG_INVALID);
744 avio_write(bc, ID_STRING, strlen(ID_STRING));
747 if ((ret = write_headers(s, bc)) < 0)
750 if (s->avoid_negative_ts < 0)
751 s->avoid_negative_ts = 1;
756 static int get_needed_flags(NUTContext *nut, StreamContext *nus, FrameCode *fc,
761 if (pkt->flags & AV_PKT_FLAG_KEY)
763 if (pkt->stream_index != fc->stream_id)
764 flags |= FLAG_STREAM_ID;
765 if (pkt->size / fc->size_mul)
766 flags |= FLAG_SIZE_MSB;
767 if (pkt->pts - nus->last_pts != fc->pts_delta)
768 flags |= FLAG_CODED_PTS;
769 if (pkt->side_data_elems && nut->version > 3)
770 flags |= FLAG_SM_DATA;
771 if (pkt->size > 2 * nut->max_distance)
772 flags |= FLAG_CHECKSUM;
773 if (FFABS(pkt->pts - nus->last_pts) > nus->max_pts_distance)
774 flags |= FLAG_CHECKSUM;
776 if (pkt->size < nut->header_len[fc->header_idx] ||
778 memcmp(pkt->data, nut->header [fc->header_idx],
779 nut->header_len[fc->header_idx]))
780 flags |= FLAG_HEADER_IDX;
782 return flags | (fc->flags & FLAG_CODED);
785 static int find_best_header_idx(NUTContext *nut, AVPacket *pkt)
791 if (pkt->size > 4096)
794 for (i = 1; i < nut->header_count; i++)
795 if (pkt->size >= nut->header_len[i]
796 && nut->header_len[i] > best_len
797 && !memcmp(pkt->data, nut->header[i], nut->header_len[i])) {
799 best_len = nut->header_len[i];
804 static int write_sm_data(AVFormatContext *s, AVIOContext *bc, AVPacket *pkt, int is_meta)
806 int ret, i, dyn_size;
809 int sm_data_count = 0;
813 ret = avio_open_dyn_buf(&dyn_bc);
817 for (i = 0; i<pkt->side_data_elems; i++) {
818 const uint8_t *data = pkt->side_data[i].data;
819 int size = pkt->side_data[i].size;
820 const uint8_t *data_end = data + size;
823 if ( pkt->side_data[i].type == AV_PKT_DATA_METADATA_UPDATE
824 || pkt->side_data[i].type == AV_PKT_DATA_STRINGS_METADATA) {
825 if (!size || data[size-1]) {
826 ret = AVERROR(EINVAL);
829 while (data < data_end) {
830 const uint8_t *key = data;
831 const uint8_t *val = data + strlen(key) + 1;
833 if(val >= data_end) {
834 ret = AVERROR(EINVAL);
837 put_str(dyn_bc, key);
839 put_str(dyn_bc, val);
840 data = val + strlen(val) + 1;
845 switch (pkt->side_data[i].type) {
846 case AV_PKT_DATA_PALETTE:
847 case AV_PKT_DATA_NEW_EXTRADATA:
848 case AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL:
850 if (pkt->side_data[i].type == AV_PKT_DATA_PALETTE) {
851 put_str(dyn_bc, "Palette");
852 } else if(pkt->side_data[i].type == AV_PKT_DATA_NEW_EXTRADATA) {
853 put_str(dyn_bc, "Extradata");
854 } else if(pkt->side_data[i].type == AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL) {
855 snprintf(tmp, sizeof(tmp), "CodecSpecificSide%"PRId64"", AV_RB64(data));
856 put_str(dyn_bc, tmp);
858 snprintf(tmp, sizeof(tmp), "UserData%s-SD-%d",
859 (s->flags & AVFMT_FLAG_BITEXACT) ? "Lavf" : LIBAVFORMAT_IDENT,
860 pkt->side_data[i].type);
861 put_str(dyn_bc, tmp);
864 put_str(dyn_bc, "bin");
865 ff_put_v(dyn_bc, pkt->side_data[i].size);
866 avio_write(dyn_bc, data, pkt->side_data[i].size);
869 case AV_PKT_DATA_PARAM_CHANGE:
870 flags = bytestream_get_le32(&data);
871 if (flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT) {
872 put_str(dyn_bc, "Channels");
873 put_s(dyn_bc, bytestream_get_le32(&data));
876 if (flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT) {
877 put_str(dyn_bc, "ChannelLayout");
879 put_str(dyn_bc, "u64");
881 avio_write(dyn_bc, data, 8); data+=8;
884 if (flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE) {
885 put_str(dyn_bc, "SampleRate");
886 put_s(dyn_bc, bytestream_get_le32(&data));
889 if (flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS) {
890 put_str(dyn_bc, "Width");
891 put_s(dyn_bc, bytestream_get_le32(&data));
892 put_str(dyn_bc, "Height");
893 put_s(dyn_bc, bytestream_get_le32(&data));
897 case AV_PKT_DATA_SKIP_SAMPLES:
899 put_str(dyn_bc, "SkipStart");
900 put_s(dyn_bc, (unsigned)AV_RL32(data));
903 if (AV_RL32(data+4)) {
904 put_str(dyn_bc, "SkipEnd");
905 put_s(dyn_bc, (unsigned)AV_RL32(data+4));
909 case AV_PKT_DATA_METADATA_UPDATE:
910 case AV_PKT_DATA_STRINGS_METADATA:
911 case AV_PKT_DATA_QUALITY_STATS:
912 // belongs into meta, not side data
919 ff_put_v(bc, sm_data_count);
920 dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf);
921 avio_write(bc, dyn_buf, dyn_size);
927 static int nut_write_packet(AVFormatContext *s, AVPacket *pkt)
929 NUTContext *nut = s->priv_data;
930 StreamContext *nus = &nut->stream[pkt->stream_index];
931 AVIOContext *bc = s->pb, *dyn_bc, *sm_bc = NULL;
934 int best_length, frame_code, flags, needed_flags, i, header_idx;
936 int key_frame = !!(pkt->flags & AV_PKT_FLAG_KEY);
940 int data_size = pkt->size;
941 uint8_t *sm_buf = NULL;
944 av_log(s, AV_LOG_ERROR,
945 "Negative pts not supported stream %d, pts %"PRId64"\n",
946 pkt->stream_index, pkt->pts);
947 if (pkt->pts == AV_NOPTS_VALUE)
948 av_log(s, AV_LOG_ERROR, "Try to enable the genpts flag\n");
949 return AVERROR(EINVAL);
952 if (pkt->side_data_elems && nut->version > 3) {
953 ret = avio_open_dyn_buf(&sm_bc);
956 ret = write_sm_data(s, sm_bc, pkt, 0);
958 ret = write_sm_data(s, sm_bc, pkt, 1);
959 sm_size = avio_close_dyn_buf(sm_bc, &sm_buf);
962 data_size += sm_size;
965 if (1LL << (20 + 3 * nut->header_count) <= avio_tell(bc))
966 write_headers(s, bc);
968 if (key_frame && !(nus->last_flags & FLAG_KEY))
971 if (data_size + 30 /*FIXME check*/ + avio_tell(bc) >= nut->last_syncpoint_pos + nut->max_distance)
974 //FIXME: Ensure store_sp is 1 in the first place.
977 (!(nut->flags & NUT_PIPE) || nut->last_syncpoint_pos == INT_MIN)) {
978 int64_t sp_pos = INT64_MAX;
980 ff_nut_reset_ts(nut, *nus->time_base, pkt->dts);
981 for (i = 0; i < s->nb_streams; i++) {
982 AVStream *st = s->streams[i];
983 int64_t dts_tb = av_rescale_rnd(pkt->dts,
984 nus->time_base->num * (int64_t)nut->stream[i].time_base->den,
985 nus->time_base->den * (int64_t)nut->stream[i].time_base->num,
987 int index = av_index_search_timestamp(st, dts_tb,
988 AVSEEK_FLAG_BACKWARD);
990 sp_pos = FFMIN(sp_pos, st->index_entries[index].pos);
991 if (!nut->write_index && 2*index > st->nb_index_entries) {
992 memmove(st->index_entries,
993 st->index_entries + index,
994 sizeof(*st->index_entries) * (st->nb_index_entries - index));
995 st->nb_index_entries -= index;
1000 nut->last_syncpoint_pos = avio_tell(bc);
1001 ret = avio_open_dyn_buf(&dyn_bc);
1004 put_tt(nut, nus->time_base, dyn_bc, pkt->dts);
1005 ff_put_v(dyn_bc, sp_pos != INT64_MAX ? (nut->last_syncpoint_pos - sp_pos) >> 4 : 0);
1007 if (nut->flags & NUT_BROADCAST) {
1008 put_tt(nut, nus->time_base, dyn_bc,
1009 av_rescale_q(av_gettime(), AV_TIME_BASE_Q, *nus->time_base));
1011 put_packet(nut, bc, dyn_bc, SYNCPOINT_STARTCODE);
1012 ffio_free_dyn_buf(&dyn_bc);
1014 if (nut->write_index) {
1015 if ((ret = ff_nut_add_sp(nut, nut->last_syncpoint_pos, 0 /*unused*/, pkt->dts)) < 0)
1018 if ((1ll<<60) % nut->sp_count == 0)
1019 for (i=0; i<s->nb_streams; i++) {
1021 StreamContext *nus = &nut->stream[i];
1022 av_reallocp_array(&nus->keyframe_pts, 2*nut->sp_count, sizeof(*nus->keyframe_pts));
1023 if (!nus->keyframe_pts) {
1024 ret = AVERROR(ENOMEM);
1027 for (j=nut->sp_count == 1 ? 0 : nut->sp_count; j<2*nut->sp_count; j++)
1028 nus->keyframe_pts[j] = AV_NOPTS_VALUE;
1032 av_assert0(nus->last_pts != AV_NOPTS_VALUE);
1034 coded_pts = pkt->pts & ((1 << nus->msb_pts_shift) - 1);
1035 if (ff_lsb2full(nus, coded_pts) != pkt->pts)
1036 coded_pts = pkt->pts + (1 << nus->msb_pts_shift);
1038 best_header_idx = find_best_header_idx(nut, pkt);
1040 best_length = INT_MAX;
1042 for (i = 0; i < 256; i++) {
1044 FrameCode *fc = &nut->frame_code[i];
1045 int flags = fc->flags;
1047 if (flags & FLAG_INVALID)
1049 needed_flags = get_needed_flags(nut, nus, fc, pkt);
1051 if (flags & FLAG_CODED) {
1053 flags = needed_flags;
1056 if ((flags & needed_flags) != needed_flags)
1059 if ((flags ^ needed_flags) & FLAG_KEY)
1062 if (flags & FLAG_STREAM_ID)
1063 length += ff_get_v_length(pkt->stream_index);
1065 if (data_size % fc->size_mul != fc->size_lsb)
1067 if (flags & FLAG_SIZE_MSB)
1068 length += ff_get_v_length(data_size / fc->size_mul);
1070 if (flags & FLAG_CHECKSUM)
1073 if (flags & FLAG_CODED_PTS)
1074 length += ff_get_v_length(coded_pts);
1076 if ( (flags & FLAG_CODED)
1077 && nut->header_len[best_header_idx] > nut->header_len[fc->header_idx] + 1) {
1078 flags |= FLAG_HEADER_IDX;
1081 if (flags & FLAG_HEADER_IDX) {
1082 length += 1 - nut->header_len[best_header_idx];
1084 length -= nut->header_len[fc->header_idx];
1088 length += !(flags & FLAG_CODED_PTS);
1089 length += !(flags & FLAG_CHECKSUM);
1091 if (length < best_length) {
1092 best_length = length;
1096 av_assert0(frame_code != -1);
1098 fc = &nut->frame_code[frame_code];
1100 needed_flags = get_needed_flags(nut, nus, fc, pkt);
1101 header_idx = fc->header_idx;
1103 ffio_init_checksum(bc, ff_crc04C11DB7_update, 0);
1104 avio_w8(bc, frame_code);
1105 if (flags & FLAG_CODED) {
1106 ff_put_v(bc, (flags ^ needed_flags) & ~(FLAG_CODED));
1107 flags = needed_flags;
1109 if (flags & FLAG_STREAM_ID) ff_put_v(bc, pkt->stream_index);
1110 if (flags & FLAG_CODED_PTS) ff_put_v(bc, coded_pts);
1111 if (flags & FLAG_SIZE_MSB ) ff_put_v(bc, data_size / fc->size_mul);
1112 if (flags & FLAG_HEADER_IDX) ff_put_v(bc, header_idx = best_header_idx);
1114 if (flags & FLAG_CHECKSUM) avio_wl32(bc, ffio_get_checksum(bc));
1115 else ffio_get_checksum(bc);
1117 if (flags & FLAG_SM_DATA) {
1118 avio_write(bc, sm_buf, sm_size);
1120 avio_write(bc, pkt->data + nut->header_len[header_idx], pkt->size - nut->header_len[header_idx]);
1122 nus->last_flags = flags;
1123 nus->last_pts = pkt->pts;
1125 //FIXME just store one per syncpoint
1126 if (flags & FLAG_KEY && !(nut->flags & NUT_PIPE)) {
1128 s->streams[pkt->stream_index],
1129 nut->last_syncpoint_pos,
1134 if (nus->keyframe_pts && nus->keyframe_pts[nut->sp_count] == AV_NOPTS_VALUE)
1135 nus->keyframe_pts[nut->sp_count] = pkt->pts;
1138 if (!nut->max_pts_tb || av_compare_ts(nut->max_pts, *nut->max_pts_tb, pkt->pts, *nus->time_base) < 0) {
1139 nut->max_pts = pkt->pts;
1140 nut->max_pts_tb = nus->time_base;
1149 static int nut_write_trailer(AVFormatContext *s)
1151 NUTContext *nut = s->priv_data;
1152 AVIOContext *bc = s->pb, *dyn_bc;
1155 while (nut->header_count < 3)
1156 write_headers(s, bc);
1161 ret = avio_open_dyn_buf(&dyn_bc);
1163 av_assert1(nut->write_index); // sp_count should be 0 if no index is going to be written
1164 write_index(nut, dyn_bc);
1165 put_packet(nut, bc, dyn_bc, INDEX_STARTCODE);
1166 ffio_free_dyn_buf(&dyn_bc);
1172 static void nut_write_deinit(AVFormatContext *s)
1174 NUTContext *nut = s->priv_data;
1177 ff_nut_free_sp(nut);
1179 for (i=0; i<s->nb_streams; i++)
1180 av_freep(&nut->stream[i].keyframe_pts);
1182 av_freep(&nut->stream);
1183 av_freep(&nut->chapter);
1184 av_freep(&nut->time_base);
1187 #define OFFSET(x) offsetof(NUTContext, x)
1188 #define E AV_OPT_FLAG_ENCODING_PARAM
1189 static const AVOption options[] = {
1190 { "syncpoints", "NUT syncpoint behaviour", OFFSET(flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, INT_MIN, INT_MAX, E, "syncpoints" },
1191 { "default", "", 0, AV_OPT_TYPE_CONST, {.i64 = 0}, INT_MIN, INT_MAX, E, "syncpoints" },
1192 { "none", "Disable syncpoints, low overhead and unseekable", 0, AV_OPT_TYPE_CONST, {.i64 = NUT_PIPE}, INT_MIN, INT_MAX, E, "syncpoints" },
1193 { "timestamped", "Extend syncpoints with a wallclock timestamp", 0, AV_OPT_TYPE_CONST, {.i64 = NUT_BROADCAST}, INT_MIN, INT_MAX, E, "syncpoints" },
1194 { "write_index", "Write index", OFFSET(write_index), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, E, },
1198 static const AVClass class = {
1199 .class_name = "nutenc",
1200 .item_name = av_default_item_name,
1202 .version = LIBAVUTIL_VERSION_INT,
1205 AVOutputFormat ff_nut_muxer = {
1207 .long_name = NULL_IF_CONFIG_SMALL("NUT"),
1208 .mime_type = "video/x-nut",
1209 .extensions = "nut",
1210 .priv_data_size = sizeof(NUTContext),
1211 .audio_codec = CONFIG_LIBVORBIS ? AV_CODEC_ID_VORBIS :
1212 CONFIG_LIBMP3LAME ? AV_CODEC_ID_MP3 : AV_CODEC_ID_MP2,
1213 .video_codec = AV_CODEC_ID_MPEG4,
1214 .write_header = nut_write_header,
1215 .write_packet = nut_write_packet,
1216 .write_trailer = nut_write_trailer,
1217 .deinit = nut_write_deinit,
1218 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS,
1219 .codec_tag = ff_nut_codec_tags,
1220 .priv_class = &class,