3 * Copyright (c) 2004-2007 Michael Niedermayer
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/intreadwrite.h"
23 #include "libavutil/mathematics.h"
24 #include "libavutil/tree.h"
25 #include "libavutil/dict.h"
26 #include "libavutil/avassert.h"
27 #include "libavcodec/mpegaudiodata.h"
30 #include "avio_internal.h"
33 static int find_expected_header(AVCodecContext *c, int size, int key_frame,
36 int sample_rate = c->sample_rate;
43 if (c->codec_id == AV_CODEC_ID_MPEG4) {
50 } else if (c->codec_id == AV_CODEC_ID_MPEG1VIDEO ||
51 c->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
53 } else if (c->codec_id == AV_CODEC_ID_H264) {
55 } else if (c->codec_id == AV_CODEC_ID_MP3 ||
56 c->codec_id == AV_CODEC_ID_MP2) {
57 int lsf, mpeg25, sample_rate_index, bitrate_index, frame_size;
58 int layer = c->codec_id == AV_CODEC_ID_MP3 ? 3 : 2;
59 unsigned int header = 0xFFF00000;
61 lsf = sample_rate < (24000 + 32000) / 2;
62 mpeg25 = sample_rate < (12000 + 16000) / 2;
63 sample_rate <<= lsf + mpeg25;
64 if (sample_rate < (32000 + 44100) / 2) sample_rate_index = 2;
65 else if (sample_rate < (44100 + 48000) / 2) sample_rate_index = 0;
66 else sample_rate_index = 1;
68 sample_rate = avpriv_mpa_freq_tab[sample_rate_index] >> (lsf + mpeg25);
70 for (bitrate_index = 2; bitrate_index < 30; bitrate_index++) {
72 avpriv_mpa_bitrate_tab[lsf][layer - 1][bitrate_index >> 1];
73 frame_size = (frame_size * 144000) / (sample_rate << lsf) +
76 if (frame_size == size)
80 header |= (!lsf) << 19;
81 header |= (4 - layer) << 17;
82 header |= 1 << 16; //no crc
85 return 2; //we guess there is no crc, if there is one the user clearly does not care about overhead
86 if (bitrate_index == 30)
87 return -1; //something is wrong ...
89 header |= (bitrate_index >> 1) << 12;
90 header |= sample_rate_index << 10;
91 header |= (bitrate_index & 1) << 9;
93 return 2; //FIXME actually put the needed ones in build_elision_headers()
94 //return 3; //we guess that the private bit is not set
95 //FIXME the above assumptions should be checked, if these turn out false too often something should be done
100 static int find_header_idx(AVFormatContext *s, AVCodecContext *c, int size, int frame_type)
102 NUTContext *nut = s->priv_data;
105 int len = find_expected_header(c, size, frame_type, out);
107 for (i = 1; i < nut->header_count; i++) {
108 if (len == nut->header_len[i] && !memcmp(out, nut->header[i], len)) {
116 static void build_elision_headers(AVFormatContext *s)
118 NUTContext *nut = s->priv_data;
121 //FIXME write a 2pass mode to find the maximal headers
122 static const uint8_t headers[][5] = {
123 { 3, 0x00, 0x00, 0x01 },
124 { 4, 0x00, 0x00, 0x01, 0xB6},
125 { 2, 0xFF, 0xFA }, //mp3+crc
126 { 2, 0xFF, 0xFB }, //mp3
127 { 2, 0xFF, 0xFC }, //mp2+crc
128 { 2, 0xFF, 0xFD }, //mp2
131 nut->header_count = 7;
132 for (i = 1; i < nut->header_count; i++) {
133 nut->header_len[i] = headers[i - 1][0];
134 nut->header[i] = &headers[i - 1][1];
138 static void build_frame_code(AVFormatContext *s)
140 NUTContext *nut = s->priv_data;
141 int key_frame, index, pred, stream_id;
144 int keyframe_0_esc = s->nb_streams > 2;
148 ft = &nut->frame_code[start];
149 ft->flags = FLAG_CODED;
154 if (keyframe_0_esc) {
155 /* keyframe = 0 escape */
156 FrameCode *ft = &nut->frame_code[start];
157 ft->flags = FLAG_STREAM_ID | FLAG_SIZE_MSB | FLAG_CODED_PTS;
162 for (stream_id = 0; stream_id < s->nb_streams; stream_id++) {
163 int start2 = start + (end - start) * stream_id / s->nb_streams;
164 int end2 = start + (end - start) * (stream_id + 1) / s->nb_streams;
165 AVCodecContext *codec = s->streams[stream_id]->codec;
166 int is_audio = codec->codec_type == AVMEDIA_TYPE_AUDIO;
167 int intra_only = /*codec->intra_only || */ is_audio;
171 if (codec->codec_type == AVMEDIA_TYPE_AUDIO) {
172 frame_size = av_get_audio_frame_duration(codec, 0);
173 if (codec->codec_id == AV_CODEC_ID_VORBIS && !frame_size)
176 AVRational f = av_div_q(codec->time_base, *nut->stream[stream_id].time_base);
177 if (f.den == 1 && f.num>0)
183 for (key_frame = 0; key_frame < 2; key_frame++) {
184 if (!intra_only || !keyframe_0_esc || key_frame != 0) {
185 FrameCode *ft = &nut->frame_code[start2];
186 ft->flags = FLAG_KEY * key_frame;
187 ft->flags |= FLAG_SIZE_MSB | FLAG_CODED_PTS;
188 ft->stream_id = stream_id;
191 ft->header_idx = find_header_idx(s, codec, -1, key_frame);
196 key_frame = intra_only;
199 int frame_bytes = codec->frame_size * (int64_t)codec->bit_rate /
200 (8 * codec->sample_rate);
202 for (pts = 0; pts < 2; pts++) {
203 for (pred = 0; pred < 2; pred++) {
204 FrameCode *ft = &nut->frame_code[start2];
205 ft->flags = FLAG_KEY * key_frame;
206 ft->stream_id = stream_id;
207 ft->size_mul = frame_bytes + 2;
208 ft->size_lsb = frame_bytes + pred;
209 ft->pts_delta = pts * frame_size;
210 ft->header_idx = find_header_idx(s, codec, 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;
219 ft->pts_delta = frame_size;
224 if (codec->has_b_frames) {
231 } else if (codec->codec_id == AV_CODEC_ID_VORBIS) {
241 for (pred = 0; pred < pred_count; pred++) {
242 int start3 = start2 + (end2 - start2) * pred / pred_count;
243 int end3 = start2 + (end2 - start2) * (pred + 1) / pred_count;
245 pred_table[pred] *= frame_size;
247 for (index = start3; index < end3; index++) {
248 FrameCode *ft = &nut->frame_code[index];
249 ft->flags = FLAG_KEY * key_frame;
250 ft->flags |= FLAG_SIZE_MSB;
251 ft->stream_id = stream_id;
252 //FIXME use single byte size and pred from last
253 ft->size_mul = end3 - start3;
254 ft->size_lsb = index - start3;
255 ft->pts_delta = pred_table[pred];
257 ft->header_idx = find_header_idx(s, codec, -1, key_frame);
261 memmove(&nut->frame_code['N' + 1], &nut->frame_code['N'], sizeof(FrameCode) * (255 - 'N'));
262 nut->frame_code[0].flags =
263 nut->frame_code[255].flags =
264 nut->frame_code['N'].flags = FLAG_INVALID;
267 static void put_tt(NUTContext *nut, AVRational *time_base, AVIOContext *bc, uint64_t val)
269 val *= nut->time_base_count;
270 val += time_base - nut->time_base;
274 * Store a string as vb.
276 static void put_str(AVIOContext *bc, const char *string)
278 int len = strlen(string);
281 avio_write(bc, string, len);
284 static void put_s(AVIOContext *bc, int64_t val)
286 ff_put_v(bc, 2 * FFABS(val) - (val > 0));
290 static inline void ff_put_v_trace(AVIOContext *bc, uint64_t v, const char *file,
291 const char *func, int line)
293 av_log(NULL, AV_LOG_DEBUG, "ff_put_v %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
298 static inline void put_s_trace(AVIOContext *bc, int64_t v, const char *file, const char *func, int line)
300 av_log(NULL, AV_LOG_DEBUG, "put_s %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
304 #define ff_put_v(bc, v) ff_put_v_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
305 #define put_s(bc, v) put_s_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
308 //FIXME remove calculate_checksum
309 static void put_packet(NUTContext *nut, AVIOContext *bc, AVIOContext *dyn_bc,
310 int calculate_checksum, uint64_t startcode)
312 uint8_t *dyn_buf = NULL;
313 int dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf);
314 int forw_ptr = dyn_size + 4 * calculate_checksum;
317 ffio_init_checksum(bc, ff_crc04C11DB7_update, 0);
318 avio_wb64(bc, startcode);
319 ff_put_v(bc, forw_ptr);
321 avio_wl32(bc, ffio_get_checksum(bc));
323 if (calculate_checksum)
324 ffio_init_checksum(bc, ff_crc04C11DB7_update, 0);
325 avio_write(bc, dyn_buf, dyn_size);
326 if (calculate_checksum)
327 avio_wl32(bc, ffio_get_checksum(bc));
332 static void write_mainheader(NUTContext *nut, AVIOContext *bc)
334 int i, j, tmp_pts, tmp_flags, tmp_stream, tmp_mul, tmp_size, tmp_fields,
338 ff_put_v(bc, NUT_VERSION);
339 ff_put_v(bc, nut->avf->nb_streams);
340 ff_put_v(bc, nut->max_distance);
341 ff_put_v(bc, nut->time_base_count);
343 for (i = 0; i < nut->time_base_count; i++) {
344 ff_put_v(bc, nut->time_base[i].num);
345 ff_put_v(bc, nut->time_base[i].den);
351 tmp_match = 1 - (1LL << 62);
353 for (i = 0; i < 256; ) {
357 if (tmp_pts != nut->frame_code[i].pts_delta ) tmp_fields = 1;
358 if (tmp_mul != nut->frame_code[i].size_mul ) tmp_fields = 2;
359 if (tmp_stream != nut->frame_code[i].stream_id ) tmp_fields = 3;
360 if (tmp_size != nut->frame_code[i].size_lsb ) tmp_fields = 4;
361 // if (tmp_res != nut->frame_code[i].res ) tmp_fields=5;
362 if (tmp_head_idx != nut->frame_code[i].header_idx) tmp_fields = 8;
364 tmp_pts = nut->frame_code[i].pts_delta;
365 tmp_flags = nut->frame_code[i].flags;
366 tmp_stream = nut->frame_code[i].stream_id;
367 tmp_mul = nut->frame_code[i].size_mul;
368 tmp_size = nut->frame_code[i].size_lsb;
369 // tmp_res = nut->frame_code[i].res;
370 tmp_head_idx = nut->frame_code[i].header_idx;
372 for (j = 0; i < 256; j++, i++) {
377 if (nut->frame_code[i].pts_delta != tmp_pts ||
378 nut->frame_code[i].flags != tmp_flags ||
379 nut->frame_code[i].stream_id != tmp_stream ||
380 nut->frame_code[i].size_mul != tmp_mul ||
381 nut->frame_code[i].size_lsb != tmp_size + j ||
382 // nut->frame_code[i].res != tmp_res ||
383 nut->frame_code[i].header_idx != tmp_head_idx)
386 if (j != tmp_mul - tmp_size)
389 ff_put_v(bc, tmp_flags);
390 ff_put_v(bc, tmp_fields);
391 if (tmp_fields > 0) put_s(bc, tmp_pts);
392 if (tmp_fields > 1) ff_put_v(bc, tmp_mul);
393 if (tmp_fields > 2) ff_put_v(bc, tmp_stream);
394 if (tmp_fields > 3) ff_put_v(bc, tmp_size);
395 if (tmp_fields > 4) ff_put_v(bc, 0 /*tmp_res*/);
396 if (tmp_fields > 5) ff_put_v(bc, j);
397 if (tmp_fields > 6) ff_put_v(bc, tmp_match);
398 if (tmp_fields > 7) 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;
414 switch (codec->codec_type) {
415 case AVMEDIA_TYPE_VIDEO: ff_put_v(bc, 0); break;
416 case AVMEDIA_TYPE_AUDIO: ff_put_v(bc, 1); break;
417 case AVMEDIA_TYPE_SUBTITLE: ff_put_v(bc, 2); break;
418 default: ff_put_v(bc, 3); break;
421 if (codec->codec_tag) {
422 avio_wl32(bc, codec->codec_tag);
424 av_log(avctx, AV_LOG_ERROR, "No codec tag defined for stream %d\n", i);
425 return AVERROR(EINVAL);
428 ff_put_v(bc, nut->stream[i].time_base - nut->time_base);
429 ff_put_v(bc, nut->stream[i].msb_pts_shift);
430 ff_put_v(bc, nut->stream[i].max_pts_distance);
431 ff_put_v(bc, codec->has_b_frames);
432 avio_w8(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */
434 ff_put_v(bc, codec->extradata_size);
435 avio_write(bc, codec->extradata, codec->extradata_size);
437 switch (codec->codec_type) {
438 case AVMEDIA_TYPE_AUDIO:
439 ff_put_v(bc, codec->sample_rate);
441 ff_put_v(bc, codec->channels);
443 case AVMEDIA_TYPE_VIDEO:
444 ff_put_v(bc, codec->width);
445 ff_put_v(bc, codec->height);
447 if (st->sample_aspect_ratio.num <= 0 ||
448 st->sample_aspect_ratio.den <= 0) {
452 ff_put_v(bc, st->sample_aspect_ratio.num);
453 ff_put_v(bc, st->sample_aspect_ratio.den);
455 ff_put_v(bc, 0); /* csp type -- unknown */
463 static int add_info(AVIOContext *bc, const char *type, const char *value)
471 static int write_globalinfo(NUTContext *nut, AVIOContext *bc)
473 AVFormatContext *s = nut->avf;
474 AVDictionaryEntry *t = NULL;
476 uint8_t *dyn_buf = NULL;
477 int count = 0, dyn_size;
478 int ret = avio_open_dyn_buf(&dyn_bc);
482 while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX)))
483 count += add_info(dyn_bc, t->key, t->value);
485 ff_put_v(bc, 0); //stream_if_plus1
486 ff_put_v(bc, 0); //chapter_id
487 ff_put_v(bc, 0); //timestamp_start
488 ff_put_v(bc, 0); //length
492 dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf);
493 avio_write(bc, dyn_buf, dyn_size);
498 static int write_streaminfo(NUTContext *nut, AVIOContext *bc, int stream_id) {
499 AVFormatContext *s= nut->avf;
500 AVStream* st = s->streams[stream_id];
501 AVDictionaryEntry *t = NULL;
503 uint8_t *dyn_buf=NULL;
504 int count=0, dyn_size, i;
505 int ret = avio_open_dyn_buf(&dyn_bc);
509 while ((t = av_dict_get(st->metadata, "", t, AV_DICT_IGNORE_SUFFIX)))
510 count += add_info(dyn_bc, t->key, t->value);
511 for (i=0; ff_nut_dispositions[i].flag; ++i) {
512 if (st->disposition & ff_nut_dispositions[i].flag)
513 count += add_info(dyn_bc, "Disposition", ff_nut_dispositions[i].str);
515 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
517 snprintf(buf, sizeof(buf), "%d/%d", st->codec->time_base.den, st->codec->time_base.num);
518 count += add_info(dyn_bc, "r_frame_rate", buf);
520 dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf);
523 ff_put_v(bc, stream_id + 1); //stream_id_plus1
524 ff_put_v(bc, 0); //chapter_id
525 ff_put_v(bc, 0); //timestamp_start
526 ff_put_v(bc, 0); //length
530 avio_write(bc, dyn_buf, dyn_size);
537 static int write_chapter(NUTContext *nut, AVIOContext *bc, int id)
540 uint8_t *dyn_buf = NULL;
541 AVDictionaryEntry *t = NULL;
542 AVChapter *ch = nut->avf->chapters[id];
543 int ret, dyn_size, count = 0;
545 ret = avio_open_dyn_buf(&dyn_bc);
549 ff_put_v(bc, 0); // stream_id_plus1
550 put_s(bc, id + 1); // chapter_id
551 put_tt(nut, nut->chapter[id].time_base, bc, ch->start); // chapter_start
552 ff_put_v(bc, ch->end - ch->start); // chapter_len
554 while ((t = av_dict_get(ch->metadata, "", t, AV_DICT_IGNORE_SUFFIX)))
555 count += add_info(dyn_bc, t->key, t->value);
559 dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf);
560 avio_write(bc, dyn_buf, dyn_size);
565 static int write_index(NUTContext *nut, AVIOContext *bc) {
567 Syncpoint dummy= { .pos= 0 };
568 Syncpoint *next_node[2] = { NULL };
569 int64_t startpos = avio_tell(bc);
570 int64_t payload_size;
572 put_tt(nut, nut->max_pts_tb, bc, nut->max_pts);
574 ff_put_v(bc, nut->sp_count);
576 for (i=0; i<nut->sp_count; i++) {
577 av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp, (void**)next_node);
578 ff_put_v(bc, (next_node[1]->pos >> 4) - (dummy.pos>>4));
579 dummy.pos = next_node[1]->pos;
582 for (i=0; i<nut->avf->nb_streams; i++) {
583 StreamContext *nus= &nut->stream[i];
584 int64_t last_pts= -1;
586 for (j=0; j<nut->sp_count; j++) {
587 int flag = (nus->keyframe_pts[j] != AV_NOPTS_VALUE) ^ (j+1 == nut->sp_count);
589 for (; j<nut->sp_count && (nus->keyframe_pts[j] != AV_NOPTS_VALUE) == flag; j++)
592 ff_put_v(bc, 1 + 2*flag + 4*n);
593 for (k= j - n; k<=j && k<nut->sp_count; k++) {
594 if (nus->keyframe_pts[k] == AV_NOPTS_VALUE)
596 av_assert0(nus->keyframe_pts[k] > last_pts);
597 ff_put_v(bc, nus->keyframe_pts[k] - last_pts);
598 last_pts = nus->keyframe_pts[k];
603 payload_size = avio_tell(bc) - startpos + 8 + 4;
605 avio_wb64(bc, 8 + payload_size + av_log2(payload_size) / 7 + 1 + 4*(payload_size > 4096));
610 static int write_headers(AVFormatContext *avctx, AVIOContext *bc)
612 NUTContext *nut = avctx->priv_data;
616 ff_metadata_conv_ctx(avctx, ff_nut_metadata_conv, NULL);
618 ret = avio_open_dyn_buf(&dyn_bc);
621 write_mainheader(nut, dyn_bc);
622 put_packet(nut, bc, dyn_bc, 1, MAIN_STARTCODE);
624 for (i = 0; i < nut->avf->nb_streams; i++) {
625 ret = avio_open_dyn_buf(&dyn_bc);
628 ret = write_streamheader(avctx, dyn_bc, nut->avf->streams[i], i);
631 put_packet(nut, bc, dyn_bc, 1, STREAM_STARTCODE);
634 ret = avio_open_dyn_buf(&dyn_bc);
637 write_globalinfo(nut, dyn_bc);
638 put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
640 for (i = 0; i < nut->avf->nb_streams; i++) {
641 ret = avio_open_dyn_buf(&dyn_bc);
644 ret = write_streaminfo(nut, dyn_bc, i);
648 put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
651 avio_close_dyn_buf(dyn_bc, &buf);
656 for (i = 0; i < nut->avf->nb_chapters; i++) {
657 ret = avio_open_dyn_buf(&dyn_bc);
660 ret = write_chapter(nut, dyn_bc, i);
663 avio_close_dyn_buf(dyn_bc, &buf);
667 put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
670 nut->last_syncpoint_pos = INT_MIN;
675 static int nut_write_header(AVFormatContext *s)
677 NUTContext *nut = s->priv_data;
678 AVIOContext *bc = s->pb;
683 nut->stream = av_calloc(s->nb_streams, sizeof(*nut->stream ));
684 nut->chapter = av_calloc(s->nb_chapters, sizeof(*nut->chapter));
685 nut->time_base= av_calloc(s->nb_streams +
686 s->nb_chapters, sizeof(*nut->time_base));
687 if (!nut->stream || !nut->chapter || !nut->time_base) {
688 av_freep(&nut->stream);
689 av_freep(&nut->chapter);
690 av_freep(&nut->time_base);
691 return AVERROR(ENOMEM);
694 for (i = 0; i < s->nb_streams; i++) {
695 AVStream *st = s->streams[i];
697 AVRational time_base;
698 ff_parse_specific_params(st->codec, &time_base.den, &ssize, &time_base.num);
700 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->codec->sample_rate) {
701 time_base = (AVRational) {1, st->codec->sample_rate};
703 time_base = ff_choose_timebase(s, st, 48000);
706 avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
708 for (j = 0; j < nut->time_base_count; j++)
709 if (!memcmp(&time_base, &nut->time_base[j], sizeof(AVRational))) {
712 nut->time_base[j] = time_base;
713 nut->stream[i].time_base = &nut->time_base[j];
714 if (j == nut->time_base_count)
715 nut->time_base_count++;
717 if (INT64_C(1000) * time_base.num >= time_base.den)
718 nut->stream[i].msb_pts_shift = 7;
720 nut->stream[i].msb_pts_shift = 14;
721 nut->stream[i].max_pts_distance =
722 FFMAX(time_base.den, time_base.num) / time_base.num;
725 for (i = 0; i < s->nb_chapters; i++) {
726 AVChapter *ch = s->chapters[i];
728 for (j = 0; j < nut->time_base_count; j++)
729 if (!memcmp(&ch->time_base, &nut->time_base[j], sizeof(AVRational)))
732 nut->time_base[j] = ch->time_base;
733 nut->chapter[i].time_base = &nut->time_base[j];
734 if (j == nut->time_base_count)
735 nut->time_base_count++;
738 nut->max_distance = MAX_DISTANCE;
739 build_elision_headers(s);
741 av_assert0(nut->frame_code['N'].flags == FLAG_INVALID);
743 avio_write(bc, ID_STRING, strlen(ID_STRING));
746 if ((ret = write_headers(s, bc)) < 0)
749 if (s->avoid_negative_ts < 0)
750 s->avoid_negative_ts = 1;
757 static int get_needed_flags(NUTContext *nut, StreamContext *nus, FrameCode *fc,
762 if (pkt->flags & AV_PKT_FLAG_KEY)
764 if (pkt->stream_index != fc->stream_id)
765 flags |= FLAG_STREAM_ID;
766 if (pkt->size / fc->size_mul)
767 flags |= FLAG_SIZE_MSB;
768 if (pkt->pts - nus->last_pts != fc->pts_delta)
769 flags |= FLAG_CODED_PTS;
770 if (pkt->size > 2 * nut->max_distance)
771 flags |= FLAG_CHECKSUM;
772 if (FFABS(pkt->pts - nus->last_pts) > nus->max_pts_distance)
773 flags |= FLAG_CHECKSUM;
774 if (pkt->size < nut->header_len[fc->header_idx] ||
775 (pkt->size > 4096 && fc->header_idx) ||
776 memcmp(pkt->data, nut->header[fc->header_idx],
777 nut->header_len[fc->header_idx]))
778 flags |= FLAG_HEADER_IDX;
780 return flags | (fc->flags & FLAG_CODED);
783 static int find_best_header_idx(NUTContext *nut, AVPacket *pkt)
789 if (pkt->size > 4096)
792 for (i = 1; i < nut->header_count; i++)
793 if (pkt->size >= nut->header_len[i]
794 && nut->header_len[i] > best_len
795 && !memcmp(pkt->data, nut->header[i], nut->header_len[i])) {
797 best_len = nut->header_len[i];
802 static int nut_write_packet(AVFormatContext *s, AVPacket *pkt)
804 NUTContext *nut = s->priv_data;
805 StreamContext *nus = &nut->stream[pkt->stream_index];
806 AVIOContext *bc = s->pb, *dyn_bc;
809 int best_length, frame_code, flags, needed_flags, i, header_idx;
811 int key_frame = !!(pkt->flags & AV_PKT_FLAG_KEY);
816 av_log(s, AV_LOG_ERROR,
817 "Negative pts not supported stream %d, pts %"PRId64"\n",
818 pkt->stream_index, pkt->pts);
819 return AVERROR(EINVAL);
822 if (1LL << (20 + 3 * nut->header_count) <= avio_tell(bc))
823 write_headers(s, bc);
825 if (key_frame && !(nus->last_flags & FLAG_KEY))
828 if (pkt->size + 30 /*FIXME check*/ + avio_tell(bc) >= nut->last_syncpoint_pos + nut->max_distance)
831 //FIXME: Ensure store_sp is 1 in the first place.
834 Syncpoint *sp, dummy = { .pos = INT64_MAX };
836 ff_nut_reset_ts(nut, *nus->time_base, pkt->dts);
837 for (i = 0; i < s->nb_streams; i++) {
838 AVStream *st = s->streams[i];
839 int64_t dts_tb = av_rescale_rnd(pkt->dts,
840 nus->time_base->num * (int64_t)nut->stream[i].time_base->den,
841 nus->time_base->den * (int64_t)nut->stream[i].time_base->num,
843 int index = av_index_search_timestamp(st, dts_tb,
844 AVSEEK_FLAG_BACKWARD);
846 dummy.pos = FFMIN(dummy.pos, st->index_entries[index].pos);
848 if (dummy.pos == INT64_MAX)
850 sp = av_tree_find(nut->syncpoints, &dummy, (void *)ff_nut_sp_pos_cmp,
853 nut->last_syncpoint_pos = avio_tell(bc);
854 ret = avio_open_dyn_buf(&dyn_bc);
857 put_tt(nut, nus->time_base, dyn_bc, pkt->dts);
858 ff_put_v(dyn_bc, sp ? (nut->last_syncpoint_pos - sp->pos) >> 4 : 0);
859 put_packet(nut, bc, dyn_bc, 1, SYNCPOINT_STARTCODE);
861 if ((ret = ff_nut_add_sp(nut, nut->last_syncpoint_pos, 0 /*unused*/, pkt->dts)) < 0)
864 if ((1ll<<60) % nut->sp_count == 0)
865 for (i=0; i<s->nb_streams; i++) {
867 StreamContext *nus = &nut->stream[i];
868 av_reallocp_array(&nus->keyframe_pts, 2*nut->sp_count, sizeof(*nus->keyframe_pts));
869 if (!nus->keyframe_pts)
870 return AVERROR(ENOMEM);
871 for (j=nut->sp_count == 1 ? 0 : nut->sp_count; j<2*nut->sp_count; j++)
872 nus->keyframe_pts[j] = AV_NOPTS_VALUE;
875 av_assert0(nus->last_pts != AV_NOPTS_VALUE);
877 coded_pts = pkt->pts & ((1 << nus->msb_pts_shift) - 1);
878 if (ff_lsb2full(nus, coded_pts) != pkt->pts)
879 coded_pts = pkt->pts + (1 << nus->msb_pts_shift);
881 best_header_idx = find_best_header_idx(nut, pkt);
883 best_length = INT_MAX;
885 for (i = 0; i < 256; i++) {
887 FrameCode *fc = &nut->frame_code[i];
888 int flags = fc->flags;
890 if (flags & FLAG_INVALID)
892 needed_flags = get_needed_flags(nut, nus, fc, pkt);
894 if (flags & FLAG_CODED) {
896 flags = needed_flags;
899 if ((flags & needed_flags) != needed_flags)
902 if ((flags ^ needed_flags) & FLAG_KEY)
905 if (flags & FLAG_STREAM_ID)
906 length += ff_get_v_length(pkt->stream_index);
908 if (pkt->size % fc->size_mul != fc->size_lsb)
910 if (flags & FLAG_SIZE_MSB)
911 length += ff_get_v_length(pkt->size / fc->size_mul);
913 if (flags & FLAG_CHECKSUM)
916 if (flags & FLAG_CODED_PTS)
917 length += ff_get_v_length(coded_pts);
919 if ( (flags & FLAG_CODED)
920 && nut->header_len[best_header_idx] > nut->header_len[fc->header_idx] + 1) {
921 flags |= FLAG_HEADER_IDX;
924 if (flags & FLAG_HEADER_IDX) {
925 length += 1 - nut->header_len[best_header_idx];
927 length -= nut->header_len[fc->header_idx];
931 length += !(flags & FLAG_CODED_PTS);
932 length += !(flags & FLAG_CHECKSUM);
934 if (length < best_length) {
935 best_length = length;
939 av_assert0(frame_code != -1);
940 fc = &nut->frame_code[frame_code];
942 needed_flags = get_needed_flags(nut, nus, fc, pkt);
943 header_idx = fc->header_idx;
945 ffio_init_checksum(bc, ff_crc04C11DB7_update, 0);
946 avio_w8(bc, frame_code);
947 if (flags & FLAG_CODED) {
948 ff_put_v(bc, (flags ^ needed_flags) & ~(FLAG_CODED));
949 flags = needed_flags;
951 if (flags & FLAG_STREAM_ID) ff_put_v(bc, pkt->stream_index);
952 if (flags & FLAG_CODED_PTS) ff_put_v(bc, coded_pts);
953 if (flags & FLAG_SIZE_MSB ) ff_put_v(bc, pkt->size / fc->size_mul);
954 if (flags & FLAG_HEADER_IDX) ff_put_v(bc, header_idx = best_header_idx);
956 if (flags & FLAG_CHECKSUM) avio_wl32(bc, ffio_get_checksum(bc));
957 else ffio_get_checksum(bc);
959 avio_write(bc, pkt->data + nut->header_len[header_idx], pkt->size - nut->header_len[header_idx]);
960 nus->last_flags = flags;
961 nus->last_pts = pkt->pts;
963 //FIXME just store one per syncpoint
964 if (flags & FLAG_KEY) {
966 s->streams[pkt->stream_index],
967 nut->last_syncpoint_pos,
972 if (nus->keyframe_pts && nus->keyframe_pts[nut->sp_count] == AV_NOPTS_VALUE)
973 nus->keyframe_pts[nut->sp_count] = pkt->pts;
976 if (!nut->max_pts_tb || av_compare_ts(nut->max_pts, *nut->max_pts_tb, pkt->pts, *nus->time_base) < 0) {
977 nut->max_pts = pkt->pts;
978 nut->max_pts_tb = nus->time_base;
984 static int nut_write_trailer(AVFormatContext *s)
986 NUTContext *nut = s->priv_data;
987 AVIOContext *bc = s->pb, *dyn_bc;
990 while (nut->header_count < 3)
991 write_headers(s, bc);
993 ret = avio_open_dyn_buf(&dyn_bc);
994 if (ret >= 0 && nut->sp_count) {
995 write_index(nut, dyn_bc);
996 put_packet(nut, bc, dyn_bc, 1, INDEX_STARTCODE);
1000 for (i=0; i<s->nb_streams; i++)
1001 av_freep(&nut->stream[i].keyframe_pts);
1003 av_freep(&nut->stream);
1004 av_freep(&nut->chapter);
1005 av_freep(&nut->time_base);
1010 AVOutputFormat ff_nut_muxer = {
1012 .long_name = NULL_IF_CONFIG_SMALL("NUT"),
1013 .mime_type = "video/x-nut",
1014 .extensions = "nut",
1015 .priv_data_size = sizeof(NUTContext),
1016 .audio_codec = CONFIG_LIBVORBIS ? AV_CODEC_ID_VORBIS :
1017 CONFIG_LIBMP3LAME ? AV_CODEC_ID_MP3 : AV_CODEC_ID_MP2,
1018 .video_codec = AV_CODEC_ID_MPEG4,
1019 .write_header = nut_write_header,
1020 .write_packet = nut_write_packet,
1021 .write_trailer = nut_write_trailer,
1022 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS,
1023 .codec_tag = ff_nut_codec_tags,