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 "libavcodec/bytestream.h"
30 #include "libavcodec/mpegaudiodata.h"
33 #include "avio_internal.h"
36 static int find_expected_header(AVCodecContext *c, int size, int key_frame,
39 int sample_rate = c->sample_rate;
46 if (c->codec_id == AV_CODEC_ID_MPEG4) {
53 } else if (c->codec_id == AV_CODEC_ID_MPEG1VIDEO ||
54 c->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
56 } else if (c->codec_id == AV_CODEC_ID_H264) {
58 } else if (c->codec_id == AV_CODEC_ID_MP3 ||
59 c->codec_id == AV_CODEC_ID_MP2) {
60 int lsf, mpeg25, sample_rate_index, bitrate_index, frame_size;
61 int layer = c->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) sample_rate_index = 2;
68 else if (sample_rate < (44100 + 48000) / 2) sample_rate_index = 0;
69 else sample_rate_index = 1;
71 sample_rate = avpriv_mpa_freq_tab[sample_rate_index] >> (lsf + mpeg25);
73 for (bitrate_index = 2; bitrate_index < 30; bitrate_index++) {
75 avpriv_mpa_bitrate_tab[lsf][layer - 1][bitrate_index >> 1];
76 frame_size = (frame_size * 144000) / (sample_rate << lsf) +
79 if (frame_size == size)
83 header |= (!lsf) << 19;
84 header |= (4 - layer) << 17;
85 header |= 1 << 16; //no crc
88 return 2; //we guess there is no crc, if there is one the user clearly does not care about overhead
89 if (bitrate_index == 30)
90 return -1; //something is wrong ...
92 header |= (bitrate_index >> 1) << 12;
93 header |= sample_rate_index << 10;
94 header |= (bitrate_index & 1) << 9;
96 return 2; //FIXME actually put the needed ones in build_elision_headers()
97 //return 3; //we guess that the private bit is not set
98 //FIXME the above assumptions should be checked, if these turn out false too often something should be done
103 static int find_header_idx(AVFormatContext *s, AVCodecContext *c, int size, int frame_type)
105 NUTContext *nut = s->priv_data;
108 int len = find_expected_header(c, size, frame_type, out);
110 for (i = 1; i < nut->header_count; i++) {
111 if (len == nut->header_len[i] && !memcmp(out, nut->header[i], len)) {
119 static void build_elision_headers(AVFormatContext *s)
121 NUTContext *nut = s->priv_data;
124 //FIXME write a 2pass mode to find the maximal headers
125 static const uint8_t headers[][5] = {
126 { 3, 0x00, 0x00, 0x01 },
127 { 4, 0x00, 0x00, 0x01, 0xB6},
128 { 2, 0xFF, 0xFA }, //mp3+crc
129 { 2, 0xFF, 0xFB }, //mp3
130 { 2, 0xFF, 0xFC }, //mp2+crc
131 { 2, 0xFF, 0xFD }, //mp2
134 nut->header_count = 7;
135 for (i = 1; i < nut->header_count; i++) {
136 nut->header_len[i] = headers[i - 1][0];
137 nut->header[i] = &headers[i - 1][1];
141 static void build_frame_code(AVFormatContext *s)
143 NUTContext *nut = s->priv_data;
144 int key_frame, index, pred, stream_id;
147 int keyframe_0_esc = s->nb_streams > 2;
151 ft = &nut->frame_code[start];
152 ft->flags = FLAG_CODED;
157 if (keyframe_0_esc) {
158 /* keyframe = 0 escape */
159 FrameCode *ft = &nut->frame_code[start];
160 ft->flags = FLAG_STREAM_ID | FLAG_SIZE_MSB | FLAG_CODED_PTS;
165 for (stream_id = 0; stream_id < s->nb_streams; stream_id++) {
166 int start2 = start + (end - start) * stream_id / s->nb_streams;
167 int end2 = start + (end - start) * (stream_id + 1) / s->nb_streams;
168 AVCodecContext *codec = s->streams[stream_id]->codec;
169 int is_audio = codec->codec_type == AVMEDIA_TYPE_AUDIO;
170 int intra_only = /*codec->intra_only || */ is_audio;
174 if (codec->codec_type == AVMEDIA_TYPE_AUDIO) {
175 frame_size = av_get_audio_frame_duration(codec, 0);
176 if (codec->codec_id == AV_CODEC_ID_VORBIS && !frame_size)
179 AVRational f = av_div_q(codec->time_base, *nut->stream[stream_id].time_base);
180 if (f.den == 1 && f.num>0)
186 for (key_frame = 0; key_frame < 2; key_frame++) {
187 if (!intra_only || !keyframe_0_esc || key_frame != 0) {
188 FrameCode *ft = &nut->frame_code[start2];
189 ft->flags = FLAG_KEY * key_frame;
190 ft->flags |= FLAG_SIZE_MSB | FLAG_CODED_PTS;
191 ft->stream_id = stream_id;
194 ft->header_idx = find_header_idx(s, codec, -1, key_frame);
199 key_frame = intra_only;
202 int frame_bytes = codec->frame_size * (int64_t)codec->bit_rate /
203 (8 * codec->sample_rate);
205 for (pts = 0; pts < 2; pts++) {
206 for (pred = 0; pred < 2; pred++) {
207 FrameCode *ft = &nut->frame_code[start2];
208 ft->flags = FLAG_KEY * key_frame;
209 ft->stream_id = stream_id;
210 ft->size_mul = frame_bytes + 2;
211 ft->size_lsb = frame_bytes + pred;
212 ft->pts_delta = pts * frame_size;
213 ft->header_idx = find_header_idx(s, codec, frame_bytes + pred, key_frame);
218 FrameCode *ft = &nut->frame_code[start2];
219 ft->flags = FLAG_KEY | FLAG_SIZE_MSB;
220 ft->stream_id = stream_id;
222 ft->pts_delta = frame_size;
227 if (codec->has_b_frames) {
234 } else if (codec->codec_id == AV_CODEC_ID_VORBIS) {
244 for (pred = 0; pred < pred_count; pred++) {
245 int start3 = start2 + (end2 - start2) * pred / pred_count;
246 int end3 = start2 + (end2 - start2) * (pred + 1) / pred_count;
248 pred_table[pred] *= frame_size;
250 for (index = start3; index < end3; index++) {
251 FrameCode *ft = &nut->frame_code[index];
252 ft->flags = FLAG_KEY * key_frame;
253 ft->flags |= FLAG_SIZE_MSB;
254 ft->stream_id = stream_id;
255 //FIXME use single byte size and pred from last
256 ft->size_mul = end3 - start3;
257 ft->size_lsb = index - start3;
258 ft->pts_delta = pred_table[pred];
260 ft->header_idx = find_header_idx(s, codec, -1, key_frame);
264 memmove(&nut->frame_code['N' + 1], &nut->frame_code['N'], sizeof(FrameCode) * (255 - 'N'));
265 nut->frame_code[0].flags =
266 nut->frame_code[255].flags =
267 nut->frame_code['N'].flags = FLAG_INVALID;
270 static void put_tt(NUTContext *nut, AVRational *time_base, AVIOContext *bc, uint64_t val)
272 val *= nut->time_base_count;
273 val += time_base - nut->time_base;
277 * Store a string as vb.
279 static void put_str(AVIOContext *bc, const char *string)
281 int len = strlen(string);
284 avio_write(bc, string, len);
287 static void put_s(AVIOContext *bc, int64_t val)
289 ff_put_v(bc, 2 * FFABS(val) - (val > 0));
293 static inline void ff_put_v_trace(AVIOContext *bc, uint64_t v, const char *file,
294 const char *func, int line)
296 av_log(NULL, AV_LOG_DEBUG, "ff_put_v %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
301 static inline void put_s_trace(AVIOContext *bc, int64_t v, const char *file, const char *func, int line)
303 av_log(NULL, AV_LOG_DEBUG, "put_s %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
307 #define ff_put_v(bc, v) ff_put_v_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
308 #define put_s(bc, v) put_s_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
311 //FIXME remove calculate_checksum
312 static void put_packet(NUTContext *nut, AVIOContext *bc, AVIOContext *dyn_bc,
313 int calculate_checksum, uint64_t startcode)
315 uint8_t *dyn_buf = NULL;
316 int dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf);
317 int forw_ptr = dyn_size + 4 * calculate_checksum;
320 ffio_init_checksum(bc, ff_crc04C11DB7_update, 0);
321 avio_wb64(bc, startcode);
322 ff_put_v(bc, forw_ptr);
324 avio_wl32(bc, ffio_get_checksum(bc));
326 if (calculate_checksum)
327 ffio_init_checksum(bc, ff_crc04C11DB7_update, 0);
328 avio_write(bc, dyn_buf, dyn_size);
329 if (calculate_checksum)
330 avio_wl32(bc, ffio_get_checksum(bc));
335 static void write_mainheader(NUTContext *nut, AVIOContext *bc)
337 int i, j, tmp_pts, tmp_flags, tmp_stream, tmp_mul, tmp_size, tmp_fields,
341 ff_put_v(bc, nut->version = NUT_VERSION);
342 if (nut->version > 3)
343 ff_put_v(bc, nut->minor_version);
344 ff_put_v(bc, nut->avf->nb_streams);
345 ff_put_v(bc, nut->max_distance);
346 ff_put_v(bc, nut->time_base_count);
348 for (i = 0; i < nut->time_base_count; i++) {
349 ff_put_v(bc, nut->time_base[i].num);
350 ff_put_v(bc, nut->time_base[i].den);
356 tmp_match = 1 - (1LL << 62);
358 for (i = 0; i < 256; ) {
362 if (tmp_pts != nut->frame_code[i].pts_delta ) tmp_fields = 1;
363 if (tmp_mul != nut->frame_code[i].size_mul ) tmp_fields = 2;
364 if (tmp_stream != nut->frame_code[i].stream_id ) tmp_fields = 3;
365 if (tmp_size != nut->frame_code[i].size_lsb ) tmp_fields = 4;
366 // if (tmp_res != nut->frame_code[i].res ) tmp_fields=5;
367 if (tmp_head_idx != nut->frame_code[i].header_idx) tmp_fields = 8;
369 tmp_pts = nut->frame_code[i].pts_delta;
370 tmp_flags = nut->frame_code[i].flags;
371 tmp_stream = nut->frame_code[i].stream_id;
372 tmp_mul = nut->frame_code[i].size_mul;
373 tmp_size = nut->frame_code[i].size_lsb;
374 // tmp_res = nut->frame_code[i].res;
375 tmp_head_idx = nut->frame_code[i].header_idx;
377 for (j = 0; i < 256; j++, i++) {
382 if (nut->frame_code[i].pts_delta != tmp_pts ||
383 nut->frame_code[i].flags != tmp_flags ||
384 nut->frame_code[i].stream_id != tmp_stream ||
385 nut->frame_code[i].size_mul != tmp_mul ||
386 nut->frame_code[i].size_lsb != tmp_size + j ||
387 // nut->frame_code[i].res != tmp_res ||
388 nut->frame_code[i].header_idx != tmp_head_idx)
391 if (j != tmp_mul - tmp_size)
394 ff_put_v(bc, tmp_flags);
395 ff_put_v(bc, tmp_fields);
396 if (tmp_fields > 0) put_s(bc, tmp_pts);
397 if (tmp_fields > 1) ff_put_v(bc, tmp_mul);
398 if (tmp_fields > 2) ff_put_v(bc, tmp_stream);
399 if (tmp_fields > 3) ff_put_v(bc, tmp_size);
400 if (tmp_fields > 4) ff_put_v(bc, 0 /*tmp_res*/);
401 if (tmp_fields > 5) ff_put_v(bc, j);
402 if (tmp_fields > 6) ff_put_v(bc, tmp_match);
403 if (tmp_fields > 7) ff_put_v(bc, tmp_head_idx);
405 ff_put_v(bc, nut->header_count - 1);
406 for (i = 1; i < nut->header_count; i++) {
407 ff_put_v(bc, nut->header_len[i]);
408 avio_write(bc, nut->header[i], nut->header_len[i]);
412 static int write_streamheader(AVFormatContext *avctx, AVIOContext *bc,
415 NUTContext *nut = avctx->priv_data;
416 AVCodecContext *codec = st->codec;
419 switch (codec->codec_type) {
420 case AVMEDIA_TYPE_VIDEO: ff_put_v(bc, 0); break;
421 case AVMEDIA_TYPE_AUDIO: ff_put_v(bc, 1); break;
422 case AVMEDIA_TYPE_SUBTITLE: ff_put_v(bc, 2); break;
423 default: ff_put_v(bc, 3); break;
426 if (codec->codec_tag) {
427 avio_wl32(bc, codec->codec_tag);
429 av_log(avctx, AV_LOG_ERROR, "No codec tag defined for stream %d\n", i);
430 return AVERROR(EINVAL);
433 ff_put_v(bc, nut->stream[i].time_base - nut->time_base);
434 ff_put_v(bc, nut->stream[i].msb_pts_shift);
435 ff_put_v(bc, nut->stream[i].max_pts_distance);
436 ff_put_v(bc, codec->has_b_frames);
437 avio_w8(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */
439 ff_put_v(bc, codec->extradata_size);
440 avio_write(bc, codec->extradata, codec->extradata_size);
442 switch (codec->codec_type) {
443 case AVMEDIA_TYPE_AUDIO:
444 ff_put_v(bc, codec->sample_rate);
446 ff_put_v(bc, codec->channels);
448 case AVMEDIA_TYPE_VIDEO:
449 ff_put_v(bc, codec->width);
450 ff_put_v(bc, codec->height);
452 if (st->sample_aspect_ratio.num <= 0 ||
453 st->sample_aspect_ratio.den <= 0) {
457 ff_put_v(bc, st->sample_aspect_ratio.num);
458 ff_put_v(bc, st->sample_aspect_ratio.den);
460 ff_put_v(bc, 0); /* csp type -- unknown */
468 static int add_info(AVIOContext *bc, const char *type, const char *value)
476 static int write_globalinfo(NUTContext *nut, AVIOContext *bc)
478 AVFormatContext *s = nut->avf;
479 AVDictionaryEntry *t = NULL;
481 uint8_t *dyn_buf = NULL;
482 int count = 0, dyn_size;
483 int ret = avio_open_dyn_buf(&dyn_bc);
487 while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX)))
488 count += add_info(dyn_bc, t->key, t->value);
490 ff_put_v(bc, 0); //stream_if_plus1
491 ff_put_v(bc, 0); //chapter_id
492 ff_put_v(bc, 0); //timestamp_start
493 ff_put_v(bc, 0); //length
497 dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf);
498 avio_write(bc, dyn_buf, dyn_size);
503 static int write_streaminfo(NUTContext *nut, AVIOContext *bc, int stream_id) {
504 AVFormatContext *s= nut->avf;
505 AVStream* st = s->streams[stream_id];
506 AVDictionaryEntry *t = NULL;
508 uint8_t *dyn_buf=NULL;
509 int count=0, dyn_size, i;
510 int ret = avio_open_dyn_buf(&dyn_bc);
514 while ((t = av_dict_get(st->metadata, "", t, AV_DICT_IGNORE_SUFFIX)))
515 count += add_info(dyn_bc, t->key, t->value);
516 for (i=0; ff_nut_dispositions[i].flag; ++i) {
517 if (st->disposition & ff_nut_dispositions[i].flag)
518 count += add_info(dyn_bc, "Disposition", ff_nut_dispositions[i].str);
520 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
522 snprintf(buf, sizeof(buf), "%d/%d", st->codec->time_base.den, st->codec->time_base.num);
523 count += add_info(dyn_bc, "r_frame_rate", buf);
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_index(NUTContext *nut, AVIOContext *bc) {
572 Syncpoint dummy= { .pos= 0 };
573 Syncpoint *next_node[2] = { NULL };
574 int64_t startpos = avio_tell(bc);
575 int64_t payload_size;
577 put_tt(nut, nut->max_pts_tb, bc, nut->max_pts);
579 ff_put_v(bc, nut->sp_count);
581 for (i=0; i<nut->sp_count; i++) {
582 av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp, (void**)next_node);
583 ff_put_v(bc, (next_node[1]->pos >> 4) - (dummy.pos>>4));
584 dummy.pos = next_node[1]->pos;
587 for (i=0; i<nut->avf->nb_streams; i++) {
588 StreamContext *nus= &nut->stream[i];
589 int64_t last_pts= -1;
591 for (j=0; j<nut->sp_count; j++) {
595 if (j && nus->keyframe_pts[j] == nus->keyframe_pts[j-1]) {
596 av_log(nut->avf, AV_LOG_WARNING, "Multiple keyframes with same PTS\n");
597 nus->keyframe_pts[j] = AV_NOPTS_VALUE;
600 flag = (nus->keyframe_pts[j] != AV_NOPTS_VALUE) ^ (j+1 == nut->sp_count);
601 for (; j<nut->sp_count && (nus->keyframe_pts[j] != AV_NOPTS_VALUE) == flag; j++)
604 ff_put_v(bc, 1 + 2*flag + 4*n);
605 for (k= j - n; k<=j && k<nut->sp_count; k++) {
606 if (nus->keyframe_pts[k] == AV_NOPTS_VALUE)
608 av_assert0(nus->keyframe_pts[k] > last_pts);
609 ff_put_v(bc, nus->keyframe_pts[k] - last_pts);
610 last_pts = nus->keyframe_pts[k];
615 payload_size = avio_tell(bc) - startpos + 8 + 4;
617 avio_wb64(bc, 8 + payload_size + av_log2(payload_size) / 7 + 1 + 4*(payload_size > 4096));
622 static int write_headers(AVFormatContext *avctx, AVIOContext *bc)
624 NUTContext *nut = avctx->priv_data;
628 ff_metadata_conv_ctx(avctx, ff_nut_metadata_conv, NULL);
630 ret = avio_open_dyn_buf(&dyn_bc);
633 write_mainheader(nut, dyn_bc);
634 put_packet(nut, bc, dyn_bc, 1, MAIN_STARTCODE);
636 for (i = 0; i < nut->avf->nb_streams; i++) {
637 ret = avio_open_dyn_buf(&dyn_bc);
640 ret = write_streamheader(avctx, dyn_bc, nut->avf->streams[i], i);
643 put_packet(nut, bc, dyn_bc, 1, STREAM_STARTCODE);
646 ret = avio_open_dyn_buf(&dyn_bc);
649 write_globalinfo(nut, dyn_bc);
650 put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
652 for (i = 0; i < nut->avf->nb_streams; i++) {
653 ret = avio_open_dyn_buf(&dyn_bc);
656 ret = write_streaminfo(nut, dyn_bc, i);
660 put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
663 avio_close_dyn_buf(dyn_bc, &buf);
668 for (i = 0; i < nut->avf->nb_chapters; i++) {
669 ret = avio_open_dyn_buf(&dyn_bc);
672 ret = write_chapter(nut, dyn_bc, i);
675 avio_close_dyn_buf(dyn_bc, &buf);
679 put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
682 nut->last_syncpoint_pos = INT_MIN;
687 static int nut_write_header(AVFormatContext *s)
689 NUTContext *nut = s->priv_data;
690 AVIOContext *bc = s->pb;
695 nut->stream = av_calloc(s->nb_streams, sizeof(*nut->stream ));
696 nut->chapter = av_calloc(s->nb_chapters, sizeof(*nut->chapter));
697 nut->time_base= av_calloc(s->nb_streams +
698 s->nb_chapters, sizeof(*nut->time_base));
699 if (!nut->stream || !nut->chapter || !nut->time_base) {
700 av_freep(&nut->stream);
701 av_freep(&nut->chapter);
702 av_freep(&nut->time_base);
703 return AVERROR(ENOMEM);
706 for (i = 0; i < s->nb_streams; i++) {
707 AVStream *st = s->streams[i];
709 AVRational time_base;
710 ff_parse_specific_params(st->codec, &time_base.den, &ssize, &time_base.num);
712 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->codec->sample_rate) {
713 time_base = (AVRational) {1, st->codec->sample_rate};
715 time_base = ff_choose_timebase(s, st, 48000);
718 avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
720 for (j = 0; j < nut->time_base_count; j++)
721 if (!memcmp(&time_base, &nut->time_base[j], sizeof(AVRational))) {
724 nut->time_base[j] = time_base;
725 nut->stream[i].time_base = &nut->time_base[j];
726 if (j == nut->time_base_count)
727 nut->time_base_count++;
729 if (INT64_C(1000) * time_base.num >= time_base.den)
730 nut->stream[i].msb_pts_shift = 7;
732 nut->stream[i].msb_pts_shift = 14;
733 nut->stream[i].max_pts_distance =
734 FFMAX(time_base.den, time_base.num) / time_base.num;
737 for (i = 0; i < s->nb_chapters; i++) {
738 AVChapter *ch = s->chapters[i];
740 for (j = 0; j < nut->time_base_count; j++)
741 if (!memcmp(&ch->time_base, &nut->time_base[j], sizeof(AVRational)))
744 nut->time_base[j] = ch->time_base;
745 nut->chapter[i].time_base = &nut->time_base[j];
746 if (j == nut->time_base_count)
747 nut->time_base_count++;
750 nut->max_distance = MAX_DISTANCE;
751 build_elision_headers(s);
753 av_assert0(nut->frame_code['N'].flags == FLAG_INVALID);
755 avio_write(bc, ID_STRING, strlen(ID_STRING));
758 if ((ret = write_headers(s, bc)) < 0)
761 if (s->avoid_negative_ts < 0)
762 s->avoid_negative_ts = 1;
769 static int get_needed_flags(NUTContext *nut, StreamContext *nus, FrameCode *fc,
774 if (pkt->flags & AV_PKT_FLAG_KEY)
776 if (pkt->stream_index != fc->stream_id)
777 flags |= FLAG_STREAM_ID;
778 if (pkt->size / fc->size_mul)
779 flags |= FLAG_SIZE_MSB;
780 if (pkt->pts - nus->last_pts != fc->pts_delta)
781 flags |= FLAG_CODED_PTS;
782 if (pkt->side_data_elems && nut->version > 3)
783 flags |= FLAG_SM_DATA;
784 if (pkt->size > 2 * nut->max_distance)
785 flags |= FLAG_CHECKSUM;
786 if (FFABS(pkt->pts - nus->last_pts) > nus->max_pts_distance)
787 flags |= FLAG_CHECKSUM;
788 if (pkt->size < nut->header_len[fc->header_idx] ||
789 (pkt->size > 4096 && fc->header_idx) ||
790 memcmp(pkt->data, nut->header[fc->header_idx],
791 nut->header_len[fc->header_idx]))
792 flags |= FLAG_HEADER_IDX;
794 return flags | (fc->flags & FLAG_CODED);
797 static int find_best_header_idx(NUTContext *nut, AVPacket *pkt)
803 if (pkt->size > 4096)
806 for (i = 1; i < nut->header_count; i++)
807 if (pkt->size >= nut->header_len[i]
808 && nut->header_len[i] > best_len
809 && !memcmp(pkt->data, nut->header[i], nut->header_len[i])) {
811 best_len = nut->header_len[i];
816 static int write_sm_data(AVFormatContext *s, AVIOContext *bc, AVPacket *pkt, int is_meta)
818 AVStream *st = s->streams[pkt->stream_index];
819 int ret, i, dyn_size;
822 int sm_data_count = 0;
826 ret = avio_open_dyn_buf(&dyn_bc);
830 for (i = 0; i<pkt->side_data_elems; i++) {
831 const uint8_t *data = pkt->side_data[i].data;
832 int size = pkt->side_data[i].size;
833 const uint8_t *data_end = data + size;
836 if ( pkt->side_data[i].type == AV_PKT_DATA_METADATA_UPDATE
837 || pkt->side_data[i].type == AV_PKT_DATA_STRINGS_METADATA) {
838 if (!size || data[size-1])
839 return AVERROR(EINVAL);
840 while (data < data_end) {
841 const uint8_t *key = data;
842 const uint8_t *val = data + strlen(key) + 1;
845 return AVERROR(EINVAL);
846 put_str(dyn_bc, key);
848 put_str(dyn_bc, val);
849 data = val + strlen(val) + 1;
854 switch (pkt->side_data[i].type) {
855 case AV_PKT_DATA_PALETTE:
856 case AV_PKT_DATA_NEW_EXTRADATA:
857 case AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL:
859 if (pkt->side_data[i].type == AV_PKT_DATA_PALETTE) {
860 put_str(dyn_bc, "Palette");
861 } else if(pkt->side_data[i].type == AV_PKT_DATA_NEW_EXTRADATA) {
862 put_str(dyn_bc, "Extradata");
863 } else if(pkt->side_data[i].type == AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL) {
864 snprintf(tmp, sizeof(tmp), "CodecSpecificSide%"PRId64"", AV_RB64(data));
865 put_str(dyn_bc, tmp);
867 snprintf(tmp, sizeof(tmp), "UserData%s-SD-%d",
868 (st->codec->flags & CODEC_FLAG_BITEXACT) ? "Lavf" : LIBAVFORMAT_IDENT,
869 pkt->side_data[i].type);
870 put_str(dyn_bc, tmp);
873 put_str(dyn_bc, "bin");
874 ff_put_v(dyn_bc, pkt->side_data[i].size);
875 avio_write(dyn_bc, data, pkt->side_data[i].size);
878 case AV_PKT_DATA_PARAM_CHANGE:
879 flags = bytestream_get_le32(&data);
880 if (flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT) {
881 put_str(dyn_bc, "Channels");
882 put_s(dyn_bc, bytestream_get_le32(&data));
885 if (flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT) {
886 put_str(dyn_bc, "ChannelLayout");
888 put_str(dyn_bc, "u64");
890 avio_write(dyn_bc, data, 8); data+=8;
893 if (flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE) {
894 put_str(dyn_bc, "SampleRate");
895 put_s(dyn_bc, bytestream_get_le32(&data));
898 if (flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS) {
899 put_str(dyn_bc, "Width");
900 put_s(dyn_bc, bytestream_get_le32(&data));
901 put_str(dyn_bc, "Height");
902 put_s(dyn_bc, bytestream_get_le32(&data));
905 case AV_PKT_DATA_SKIP_SAMPLES:
907 put_str(dyn_bc, "SkipStart");
908 put_s(dyn_bc, (unsigned)AV_RL32(data));
911 if (AV_RL32(data+4)) {
912 put_str(dyn_bc, "SkipEnd");
913 put_s(dyn_bc, (unsigned)AV_RL32(data+4));
917 case AV_PKT_DATA_METADATA_UPDATE:
918 case AV_PKT_DATA_STRINGS_METADATA:
919 // belongs into meta, not side data
925 ff_put_v(bc, sm_data_count);
926 dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf);
927 avio_write(bc, dyn_buf, dyn_size);
933 static int nut_write_packet(AVFormatContext *s, AVPacket *pkt)
935 NUTContext *nut = s->priv_data;
936 StreamContext *nus = &nut->stream[pkt->stream_index];
937 AVIOContext *bc = s->pb, *dyn_bc, *sm_bc = NULL;
940 int best_length, frame_code, flags, needed_flags, i, header_idx;
942 int key_frame = !!(pkt->flags & AV_PKT_FLAG_KEY);
946 int data_size = pkt->size;
950 av_log(s, AV_LOG_ERROR,
951 "Negative pts not supported stream %d, pts %"PRId64"\n",
952 pkt->stream_index, pkt->pts);
953 return AVERROR(EINVAL);
956 if (pkt->side_data_elems && nut->version > 3) {
957 ret = avio_open_dyn_buf(&sm_bc);
960 write_sm_data(s, sm_bc, pkt, 0);
961 write_sm_data(s, sm_bc, pkt, 1);
962 sm_size = avio_close_dyn_buf(sm_bc, &sm_buf);
963 data_size += sm_size;
966 if (1LL << (20 + 3 * nut->header_count) <= avio_tell(bc))
967 write_headers(s, bc);
969 if (key_frame && !(nus->last_flags & FLAG_KEY))
972 if (data_size + 30 /*FIXME check*/ + avio_tell(bc) >= nut->last_syncpoint_pos + nut->max_distance)
975 //FIXME: Ensure store_sp is 1 in the first place.
978 Syncpoint *sp, dummy = { .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 dummy.pos = FFMIN(dummy.pos, st->index_entries[index].pos);
992 if (dummy.pos == INT64_MAX)
994 sp = av_tree_find(nut->syncpoints, &dummy, (void *)ff_nut_sp_pos_cmp,
997 nut->last_syncpoint_pos = avio_tell(bc);
998 ret = avio_open_dyn_buf(&dyn_bc);
1001 put_tt(nut, nus->time_base, dyn_bc, pkt->dts);
1002 ff_put_v(dyn_bc, sp ? (nut->last_syncpoint_pos - sp->pos) >> 4 : 0);
1003 put_packet(nut, bc, dyn_bc, 1, SYNCPOINT_STARTCODE);
1005 if ((ret = ff_nut_add_sp(nut, nut->last_syncpoint_pos, 0 /*unused*/, pkt->dts)) < 0)
1008 if ((1ll<<60) % nut->sp_count == 0)
1009 for (i=0; i<s->nb_streams; i++) {
1011 StreamContext *nus = &nut->stream[i];
1012 av_reallocp_array(&nus->keyframe_pts, 2*nut->sp_count, sizeof(*nus->keyframe_pts));
1013 if (!nus->keyframe_pts)
1014 return AVERROR(ENOMEM);
1015 for (j=nut->sp_count == 1 ? 0 : nut->sp_count; j<2*nut->sp_count; j++)
1016 nus->keyframe_pts[j] = AV_NOPTS_VALUE;
1019 av_assert0(nus->last_pts != AV_NOPTS_VALUE);
1021 coded_pts = pkt->pts & ((1 << nus->msb_pts_shift) - 1);
1022 if (ff_lsb2full(nus, coded_pts) != pkt->pts)
1023 coded_pts = pkt->pts + (1 << nus->msb_pts_shift);
1025 best_header_idx = find_best_header_idx(nut, pkt);
1027 best_length = INT_MAX;
1029 for (i = 0; i < 256; i++) {
1031 FrameCode *fc = &nut->frame_code[i];
1032 int flags = fc->flags;
1034 if (flags & FLAG_INVALID)
1036 needed_flags = get_needed_flags(nut, nus, fc, pkt);
1038 if (flags & FLAG_CODED) {
1040 flags = needed_flags;
1043 if ((flags & needed_flags) != needed_flags)
1046 if ((flags ^ needed_flags) & FLAG_KEY)
1049 if (flags & FLAG_STREAM_ID)
1050 length += ff_get_v_length(pkt->stream_index);
1052 if (data_size % fc->size_mul != fc->size_lsb)
1054 if (flags & FLAG_SIZE_MSB)
1055 length += ff_get_v_length(data_size / fc->size_mul);
1057 if (flags & FLAG_CHECKSUM)
1060 if (flags & FLAG_CODED_PTS)
1061 length += ff_get_v_length(coded_pts);
1063 if ( (flags & FLAG_CODED)
1064 && nut->header_len[best_header_idx] > nut->header_len[fc->header_idx] + 1) {
1065 flags |= FLAG_HEADER_IDX;
1068 if (flags & FLAG_HEADER_IDX) {
1069 length += 1 - nut->header_len[best_header_idx];
1071 length -= nut->header_len[fc->header_idx];
1075 length += !(flags & FLAG_CODED_PTS);
1076 length += !(flags & FLAG_CHECKSUM);
1078 if (length < best_length) {
1079 best_length = length;
1083 av_assert0(frame_code != -1);
1084 fc = &nut->frame_code[frame_code];
1086 needed_flags = get_needed_flags(nut, nus, fc, pkt);
1087 header_idx = fc->header_idx;
1089 ffio_init_checksum(bc, ff_crc04C11DB7_update, 0);
1090 avio_w8(bc, frame_code);
1091 if (flags & FLAG_CODED) {
1092 ff_put_v(bc, (flags ^ needed_flags) & ~(FLAG_CODED));
1093 flags = needed_flags;
1095 if (flags & FLAG_STREAM_ID) ff_put_v(bc, pkt->stream_index);
1096 if (flags & FLAG_CODED_PTS) ff_put_v(bc, coded_pts);
1097 if (flags & FLAG_SIZE_MSB ) ff_put_v(bc, data_size / fc->size_mul);
1098 if (flags & FLAG_HEADER_IDX) ff_put_v(bc, header_idx = best_header_idx);
1100 if (flags & FLAG_CHECKSUM) avio_wl32(bc, ffio_get_checksum(bc));
1101 else ffio_get_checksum(bc);
1103 if (flags & FLAG_SM_DATA) {
1104 avio_write(bc, sm_buf, sm_size);
1107 avio_write(bc, pkt->data + nut->header_len[header_idx], pkt->size - nut->header_len[header_idx]);
1109 nus->last_flags = flags;
1110 nus->last_pts = pkt->pts;
1112 //FIXME just store one per syncpoint
1113 if (flags & FLAG_KEY) {
1115 s->streams[pkt->stream_index],
1116 nut->last_syncpoint_pos,
1121 if (nus->keyframe_pts && nus->keyframe_pts[nut->sp_count] == AV_NOPTS_VALUE)
1122 nus->keyframe_pts[nut->sp_count] = pkt->pts;
1125 if (!nut->max_pts_tb || av_compare_ts(nut->max_pts, *nut->max_pts_tb, pkt->pts, *nus->time_base) < 0) {
1126 nut->max_pts = pkt->pts;
1127 nut->max_pts_tb = nus->time_base;
1133 static int nut_write_trailer(AVFormatContext *s)
1135 NUTContext *nut = s->priv_data;
1136 AVIOContext *bc = s->pb, *dyn_bc;
1139 while (nut->header_count < 3)
1140 write_headers(s, bc);
1142 ret = avio_open_dyn_buf(&dyn_bc);
1143 if (ret >= 0 && nut->sp_count) {
1144 write_index(nut, dyn_bc);
1145 put_packet(nut, bc, dyn_bc, 1, INDEX_STARTCODE);
1148 ff_nut_free_sp(nut);
1149 for (i=0; i<s->nb_streams; i++)
1150 av_freep(&nut->stream[i].keyframe_pts);
1152 av_freep(&nut->stream);
1153 av_freep(&nut->chapter);
1154 av_freep(&nut->time_base);
1159 AVOutputFormat ff_nut_muxer = {
1161 .long_name = NULL_IF_CONFIG_SMALL("NUT"),
1162 .mime_type = "video/x-nut",
1163 .extensions = "nut",
1164 .priv_data_size = sizeof(NUTContext),
1165 .audio_codec = CONFIG_LIBVORBIS ? AV_CODEC_ID_VORBIS :
1166 CONFIG_LIBMP3LAME ? AV_CODEC_ID_MP3 : AV_CODEC_ID_MP2,
1167 .video_codec = AV_CODEC_ID_MPEG4,
1168 .write_header = nut_write_header,
1169 .write_packet = nut_write_packet,
1170 .write_trailer = nut_write_trailer,
1171 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS,
1172 .codec_tag = ff_nut_codec_tags,