avformat/http: return EINVAL if ff_http_do_new_request is called with non-http URLContext
[ffmpeg.git] / libavformat / oggenc.c
1 /*
2  * Ogg muxer
3  * Copyright (c) 2007 Baptiste Coudurier <baptiste dot coudurier at free dot fr>
4  *
5  * This file is part of FFmpeg.
6  *
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.
11  *
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.
16  *
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
20  */
21
22 #include <stdint.h>
23
24 #include "libavutil/crc.h"
25 #include "libavutil/mathematics.h"
26 #include "libavutil/opt.h"
27 #include "libavutil/random_seed.h"
28 #include "libavcodec/xiph.h"
29 #include "libavcodec/bytestream.h"
30 #include "libavcodec/flac.h"
31 #include "avformat.h"
32 #include "avio_internal.h"
33 #include "internal.h"
34 #include "vorbiscomment.h"
35
36 #define MAX_PAGE_SIZE 65025
37
38 typedef struct OGGPage {
39     int64_t start_granule;
40     int64_t granule;
41     int stream_index;
42     uint8_t flags;
43     uint8_t segments_count;
44     uint8_t segments[255];
45     uint8_t data[MAX_PAGE_SIZE];
46     uint16_t size;
47 } OGGPage;
48
49 typedef struct OGGStreamContext {
50     unsigned page_counter;
51     uint8_t *header[3];
52     int header_len[3];
53     /** for theora granule */
54     int kfgshift;
55     int64_t last_kf_pts;
56     int vrev;
57     /* for VP8 granule */
58     int isvp8;
59     int eos;
60     unsigned page_count; ///< number of page buffered
61     OGGPage page; ///< current page
62     unsigned serial_num; ///< serial number
63     int64_t last_granule; ///< last packet granule
64 } OGGStreamContext;
65
66 typedef struct OGGPageList {
67     OGGPage page;
68     struct OGGPageList *next;
69 } OGGPageList;
70
71 typedef struct OGGContext {
72     const AVClass *class;
73     OGGPageList *page_list;
74     int pref_size; ///< preferred page size (0 => fill all segments)
75     int64_t pref_duration;      ///< preferred page duration (0 => fill all segments)
76     int serial_offset;
77 } OGGContext;
78
79 #define OFFSET(x) offsetof(OGGContext, x)
80 #define PARAM AV_OPT_FLAG_ENCODING_PARAM
81
82 static const AVOption options[] = {
83     { "serial_offset", "serial number offset",
84         OFFSET(serial_offset), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, PARAM },
85     { "oggpagesize", "Set preferred Ogg page size.",
86       OFFSET(pref_size), AV_OPT_TYPE_INT, {.i64 = 0}, 0, MAX_PAGE_SIZE, PARAM},
87     { "pagesize", "preferred page size in bytes (deprecated)",
88         OFFSET(pref_size), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, MAX_PAGE_SIZE, PARAM },
89     { "page_duration", "preferred page duration, in microseconds",
90         OFFSET(pref_duration), AV_OPT_TYPE_INT64, { .i64 = 1000000 }, 0, INT64_MAX, PARAM },
91     { NULL },
92 };
93
94 #define OGG_CLASS(flavor, name)\
95 static const AVClass flavor ## _muxer_class = {\
96     .class_name = #name " muxer",\
97     .item_name  = av_default_item_name,\
98     .option     = options,\
99     .version    = LIBAVUTIL_VERSION_INT,\
100 };
101
102 static void ogg_update_checksum(AVFormatContext *s, AVIOContext *pb, int64_t crc_offset)
103 {
104     int64_t pos = avio_tell(pb);
105     uint32_t checksum = ffio_get_checksum(pb);
106     avio_seek(pb, crc_offset, SEEK_SET);
107     avio_wb32(pb, checksum);
108     avio_seek(pb, pos, SEEK_SET);
109 }
110
111 static int ogg_write_page(AVFormatContext *s, OGGPage *page, int extra_flags)
112 {
113     OGGStreamContext *oggstream = s->streams[page->stream_index]->priv_data;
114     AVIOContext *pb;
115     int64_t crc_offset;
116     int ret, size;
117     uint8_t *buf;
118
119     ret = avio_open_dyn_buf(&pb);
120     if (ret < 0)
121         return ret;
122     ffio_init_checksum(pb, ff_crc04C11DB7_update, 0);
123     ffio_wfourcc(pb, "OggS");
124     avio_w8(pb, 0);
125     avio_w8(pb, page->flags | extra_flags);
126     avio_wl64(pb, page->granule);
127     avio_wl32(pb, oggstream->serial_num);
128     avio_wl32(pb, oggstream->page_counter++);
129     crc_offset = avio_tell(pb);
130     avio_wl32(pb, 0); // crc
131     avio_w8(pb, page->segments_count);
132     avio_write(pb, page->segments, page->segments_count);
133     avio_write(pb, page->data, page->size);
134
135     ogg_update_checksum(s, pb, crc_offset);
136     avio_flush(pb);
137
138     size = avio_close_dyn_buf(pb, &buf);
139     if (size < 0)
140         return size;
141
142     avio_write(s->pb, buf, size);
143     avio_flush(s->pb);
144     av_free(buf);
145     oggstream->page_count--;
146     return 0;
147 }
148
149 static int ogg_key_granule(OGGStreamContext *oggstream, int64_t granule)
150 {
151     return (oggstream->kfgshift && !(granule & ((1<<oggstream->kfgshift)-1))) ||
152            (oggstream->isvp8    && !((granule >> 3) & 0x07ffffff));
153 }
154
155 static int64_t ogg_granule_to_timestamp(OGGStreamContext *oggstream, int64_t granule)
156 {
157     if (oggstream->kfgshift)
158         return (granule>>oggstream->kfgshift) +
159             (granule & ((1<<oggstream->kfgshift)-1));
160     else if (oggstream->isvp8)
161         return granule >> 32;
162     else
163         return granule;
164 }
165
166 static int ogg_compare_granule(AVFormatContext *s, OGGPage *next, OGGPage *page)
167 {
168     AVStream *st2 = s->streams[next->stream_index];
169     AVStream *st  = s->streams[page->stream_index];
170     int64_t next_granule, cur_granule;
171
172     if (next->granule == -1 || page->granule == -1)
173         return 0;
174
175     next_granule = av_rescale_q(ogg_granule_to_timestamp(st2->priv_data, next->granule),
176                                 st2->time_base, AV_TIME_BASE_Q);
177     cur_granule  = av_rescale_q(ogg_granule_to_timestamp(st->priv_data, page->granule),
178                                 st ->time_base, AV_TIME_BASE_Q);
179     return next_granule > cur_granule;
180 }
181
182 static int ogg_reset_cur_page(OGGStreamContext *oggstream)
183 {
184     oggstream->page.granule = -1;
185     oggstream->page.flags = 0;
186     oggstream->page.segments_count = 0;
187     oggstream->page.size = 0;
188     return 0;
189 }
190
191 static int ogg_buffer_page(AVFormatContext *s, OGGStreamContext *oggstream)
192 {
193     OGGContext *ogg = s->priv_data;
194     OGGPageList **p = &ogg->page_list;
195     OGGPageList *l = av_mallocz(sizeof(*l));
196
197     if (!l)
198         return AVERROR(ENOMEM);
199     l->page = oggstream->page;
200
201     oggstream->page.start_granule = ogg_granule_to_timestamp(oggstream, oggstream->page.granule);
202     oggstream->page_count++;
203     ogg_reset_cur_page(oggstream);
204
205     while (*p) {
206         if (ogg_compare_granule(s, &(*p)->page, &l->page))
207             break;
208         p = &(*p)->next;
209     }
210     l->next = *p;
211     *p = l;
212
213     return 0;
214 }
215
216 static int ogg_buffer_data(AVFormatContext *s, AVStream *st,
217                            uint8_t *data, unsigned size, int64_t granule,
218                            int header)
219 {
220     OGGStreamContext *oggstream = st->priv_data;
221     OGGContext *ogg = s->priv_data;
222     int total_segments = size / 255 + 1;
223     uint8_t *p = data;
224     int i, segments, len, flush = 0;
225
226     // Handles VFR by flushing page because this frame needs to have a timestamp
227     // For theora and VP8, keyframes also need to have a timestamp to correctly mark
228     // them as such, otherwise seeking will not work correctly at the very
229     // least with old libogg versions.
230     // Do not try to flush header packets though, that will create broken files.
231     if ((st->codecpar->codec_id == AV_CODEC_ID_THEORA || st->codecpar->codec_id == AV_CODEC_ID_VP8) && !header &&
232         (ogg_granule_to_timestamp(oggstream, granule) >
233          ogg_granule_to_timestamp(oggstream, oggstream->last_granule) + 1 ||
234          ogg_key_granule(oggstream, granule))) {
235         if (oggstream->page.granule != -1)
236             ogg_buffer_page(s, oggstream);
237         flush = 1;
238     }
239
240     // avoid a continued page
241     if (!header && oggstream->page.size > 0 &&
242         MAX_PAGE_SIZE - oggstream->page.size < size) {
243         ogg_buffer_page(s, oggstream);
244     }
245
246     for (i = 0; i < total_segments; ) {
247         OGGPage *page = &oggstream->page;
248
249         segments = FFMIN(total_segments - i, 255 - page->segments_count);
250
251         if (i && !page->segments_count)
252             page->flags |= 1; // continued packet
253
254         memset(page->segments+page->segments_count, 255, segments - 1);
255         page->segments_count += segments - 1;
256
257         len = FFMIN(size, segments*255);
258         page->segments[page->segments_count++] = len - (segments-1)*255;
259         memcpy(page->data+page->size, p, len);
260         p += len;
261         size -= len;
262         i += segments;
263         page->size += len;
264
265         if (i == total_segments)
266             page->granule = granule;
267
268         {
269             AVStream *st = s->streams[page->stream_index];
270
271             int64_t start = av_rescale_q(page->start_granule, st->time_base,
272                                          AV_TIME_BASE_Q);
273             int64_t next  = av_rescale_q(ogg_granule_to_timestamp(oggstream, page->granule),
274                                          st->time_base, AV_TIME_BASE_Q);
275
276             if (page->segments_count == 255) {
277                 ogg_buffer_page(s, oggstream);
278             } else if (!header) {
279                 if ((ogg->pref_size     > 0 && page->size   >= ogg->pref_size) ||
280                     (ogg->pref_duration > 0 && next - start >= ogg->pref_duration)) {
281                     ogg_buffer_page(s, oggstream);
282                 }
283             }
284         }
285     }
286
287     if (flush && oggstream->page.granule != -1)
288         ogg_buffer_page(s, oggstream);
289
290     return 0;
291 }
292
293 static uint8_t *ogg_write_vorbiscomment(int64_t offset, int bitexact,
294                                         int *header_len, AVDictionary **m, int framing_bit)
295 {
296     const char *vendor = bitexact ? "ffmpeg" : LIBAVFORMAT_IDENT;
297     int64_t size;
298     uint8_t *p, *p0;
299
300     ff_metadata_conv(m, ff_vorbiscomment_metadata_conv, NULL);
301
302     size = offset + ff_vorbiscomment_length(*m, vendor) + framing_bit;
303     if (size > INT_MAX)
304         return NULL;
305     p = av_mallocz(size);
306     if (!p)
307         return NULL;
308     p0 = p;
309
310     p += offset;
311     ff_vorbiscomment_write(&p, m, vendor);
312     if (framing_bit)
313         bytestream_put_byte(&p, 1);
314
315     *header_len = size;
316     return p0;
317 }
318
319 static int ogg_build_flac_headers(AVCodecParameters *par,
320                                   OGGStreamContext *oggstream, int bitexact,
321                                   AVDictionary **m)
322 {
323     uint8_t *p;
324
325     if (par->extradata_size < FLAC_STREAMINFO_SIZE)
326         return AVERROR(EINVAL);
327
328     // first packet: STREAMINFO
329     oggstream->header_len[0] = 51;
330     oggstream->header[0] = av_mallocz(51); // per ogg flac specs
331     p = oggstream->header[0];
332     if (!p)
333         return AVERROR(ENOMEM);
334     bytestream_put_byte(&p, 0x7F);
335     bytestream_put_buffer(&p, "FLAC", 4);
336     bytestream_put_byte(&p, 1); // major version
337     bytestream_put_byte(&p, 0); // minor version
338     bytestream_put_be16(&p, 1); // headers packets without this one
339     bytestream_put_buffer(&p, "fLaC", 4);
340     bytestream_put_byte(&p, 0x00); // streaminfo
341     bytestream_put_be24(&p, 34);
342     bytestream_put_buffer(&p, par->extradata, FLAC_STREAMINFO_SIZE);
343
344     // second packet: VorbisComment
345     p = ogg_write_vorbiscomment(4, bitexact, &oggstream->header_len[1], m, 0);
346     if (!p)
347         return AVERROR(ENOMEM);
348     oggstream->header[1] = p;
349     bytestream_put_byte(&p, 0x84); // last metadata block and vorbis comment
350     bytestream_put_be24(&p, oggstream->header_len[1] - 4);
351
352     return 0;
353 }
354
355 #define SPEEX_HEADER_SIZE 80
356
357 static int ogg_build_speex_headers(AVCodecParameters *par,
358                                    OGGStreamContext *oggstream, int bitexact,
359                                    AVDictionary **m)
360 {
361     uint8_t *p;
362
363     if (par->extradata_size < SPEEX_HEADER_SIZE)
364         return AVERROR_INVALIDDATA;
365
366     // first packet: Speex header
367     p = av_mallocz(SPEEX_HEADER_SIZE);
368     if (!p)
369         return AVERROR(ENOMEM);
370     oggstream->header[0] = p;
371     oggstream->header_len[0] = SPEEX_HEADER_SIZE;
372     bytestream_put_buffer(&p, par->extradata, SPEEX_HEADER_SIZE);
373     AV_WL32(&oggstream->header[0][68], 0);  // set extra_headers to 0
374
375     // second packet: VorbisComment
376     p = ogg_write_vorbiscomment(0, bitexact, &oggstream->header_len[1], m, 0);
377     if (!p)
378         return AVERROR(ENOMEM);
379     oggstream->header[1] = p;
380
381     return 0;
382 }
383
384 #define OPUS_HEADER_SIZE 19
385
386 static int ogg_build_opus_headers(AVCodecParameters *par,
387                                   OGGStreamContext *oggstream, int bitexact,
388                                   AVDictionary **m)
389 {
390     uint8_t *p;
391
392     if (par->extradata_size < OPUS_HEADER_SIZE)
393         return AVERROR_INVALIDDATA;
394
395     /* first packet: Opus header */
396     p = av_mallocz(par->extradata_size);
397     if (!p)
398         return AVERROR(ENOMEM);
399     oggstream->header[0] = p;
400     oggstream->header_len[0] = par->extradata_size;
401     bytestream_put_buffer(&p, par->extradata, par->extradata_size);
402
403     /* second packet: VorbisComment */
404     p = ogg_write_vorbiscomment(8, bitexact, &oggstream->header_len[1], m, 0);
405     if (!p)
406         return AVERROR(ENOMEM);
407     oggstream->header[1] = p;
408     bytestream_put_buffer(&p, "OpusTags", 8);
409
410     return 0;
411 }
412
413 #define VP8_HEADER_SIZE 26
414
415 static int ogg_build_vp8_headers(AVFormatContext *s, AVStream *st,
416                                  OGGStreamContext *oggstream, int bitexact)
417 {
418     AVCodecParameters *par = st->codecpar;
419     uint8_t *p;
420
421     /* first packet: VP8 header */
422     p = av_mallocz(VP8_HEADER_SIZE);
423     if (!p)
424         return AVERROR(ENOMEM);
425     oggstream->header[0] = p;
426     oggstream->header_len[0] = VP8_HEADER_SIZE;
427     bytestream_put_byte(&p, 0x4f); // HDRID
428     bytestream_put_buffer(&p, "VP80", 4); // Identifier
429     bytestream_put_byte(&p, 1); // HDRTYP
430     bytestream_put_byte(&p, 1); // VMAJ
431     bytestream_put_byte(&p, 0); // VMIN
432     bytestream_put_be16(&p, par->width);
433     bytestream_put_be16(&p, par->height);
434     bytestream_put_be24(&p, par->sample_aspect_ratio.num);
435     bytestream_put_be24(&p, par->sample_aspect_ratio.den);
436     if (st->r_frame_rate.num > 0 && st->r_frame_rate.den > 0) {
437         // OggVP8 requires pts to increase by 1 per visible frame, so use the least common
438         // multiple framerate if available.
439         av_log(s, AV_LOG_DEBUG, "Changing time base from %d/%d to %d/%d\n",
440                st->time_base.num, st->time_base.den,
441                st->r_frame_rate.den, st->r_frame_rate.num);
442         avpriv_set_pts_info(st, 64, st->r_frame_rate.den, st->r_frame_rate.num);
443     }
444     bytestream_put_be32(&p, st->time_base.den);
445     bytestream_put_be32(&p, st->time_base.num);
446
447     /* optional second packet: VorbisComment */
448     if (av_dict_get(st->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX)) {
449         p = ogg_write_vorbiscomment(7, bitexact, &oggstream->header_len[1], &st->metadata, 0);
450         if (!p)
451             return AVERROR(ENOMEM);
452         oggstream->header[1] = p;
453         bytestream_put_byte(&p, 0x4f); // HDRID
454         bytestream_put_buffer(&p, "VP80", 4); // Identifier
455         bytestream_put_byte(&p, 2); // HDRTYP
456         bytestream_put_byte(&p, 0x20);
457     }
458
459     oggstream->isvp8 = 1;
460
461     return 0;
462 }
463
464 static void ogg_write_pages(AVFormatContext *s, int flush)
465 {
466     OGGContext *ogg = s->priv_data;
467     OGGPageList *next, *p;
468
469     if (!ogg->page_list)
470         return;
471
472     for (p = ogg->page_list; p; ) {
473         OGGStreamContext *oggstream =
474             s->streams[p->page.stream_index]->priv_data;
475         if (oggstream->page_count < 2 && !flush)
476             break;
477         ogg_write_page(s, &p->page,
478                        flush == 1 && oggstream->page_count == 1 ? 4 : 0); // eos
479         next = p->next;
480         av_freep(&p);
481         p = next;
482     }
483     ogg->page_list = p;
484 }
485
486 static int ogg_init(AVFormatContext *s)
487 {
488     OGGContext *ogg = s->priv_data;
489     OGGStreamContext *oggstream = NULL;
490     int i, j;
491
492     if (ogg->pref_size)
493         av_log(s, AV_LOG_WARNING, "The pagesize option is deprecated\n");
494
495     for (i = 0; i < s->nb_streams; i++) {
496         AVStream *st = s->streams[i];
497         unsigned serial_num = i + ogg->serial_offset;
498
499         if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
500             if (st->codecpar->codec_id == AV_CODEC_ID_OPUS)
501                 /* Opus requires a fixed 48kHz clock */
502                 avpriv_set_pts_info(st, 64, 1, 48000);
503             else
504                 avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
505         }
506
507         if (st->codecpar->codec_id != AV_CODEC_ID_VORBIS &&
508             st->codecpar->codec_id != AV_CODEC_ID_THEORA &&
509             st->codecpar->codec_id != AV_CODEC_ID_SPEEX  &&
510             st->codecpar->codec_id != AV_CODEC_ID_FLAC   &&
511             st->codecpar->codec_id != AV_CODEC_ID_OPUS   &&
512             st->codecpar->codec_id != AV_CODEC_ID_VP8) {
513             av_log(s, AV_LOG_ERROR, "Unsupported codec id in stream %d\n", i);
514             return AVERROR(EINVAL);
515         }
516
517         if ((!st->codecpar->extradata || !st->codecpar->extradata_size) &&
518             st->codecpar->codec_id != AV_CODEC_ID_VP8) {
519             av_log(s, AV_LOG_ERROR, "No extradata present\n");
520             return AVERROR_INVALIDDATA;
521         }
522         oggstream = av_mallocz(sizeof(*oggstream));
523         if (!oggstream)
524             return AVERROR(ENOMEM);
525
526         oggstream->page.stream_index = i;
527
528         if (!(s->flags & AVFMT_FLAG_BITEXACT))
529             do {
530                 serial_num = av_get_random_seed();
531                 for (j = 0; j < i; j++) {
532                     OGGStreamContext *sc = s->streams[j]->priv_data;
533                     if (serial_num == sc->serial_num)
534                         break;
535                 }
536             } while (j < i);
537         oggstream->serial_num = serial_num;
538
539         av_dict_copy(&st->metadata, s->metadata, AV_DICT_DONT_OVERWRITE);
540
541         st->priv_data = oggstream;
542         if (st->codecpar->codec_id == AV_CODEC_ID_FLAC) {
543             int err = ogg_build_flac_headers(st->codecpar, oggstream,
544                                              s->flags & AVFMT_FLAG_BITEXACT,
545                                              &st->metadata);
546             if (err) {
547                 av_log(s, AV_LOG_ERROR, "Error writing FLAC headers\n");
548                 av_freep(&st->priv_data);
549                 return err;
550             }
551         } else if (st->codecpar->codec_id == AV_CODEC_ID_SPEEX) {
552             int err = ogg_build_speex_headers(st->codecpar, oggstream,
553                                               s->flags & AVFMT_FLAG_BITEXACT,
554                                               &st->metadata);
555             if (err) {
556                 av_log(s, AV_LOG_ERROR, "Error writing Speex headers\n");
557                 av_freep(&st->priv_data);
558                 return err;
559             }
560         } else if (st->codecpar->codec_id == AV_CODEC_ID_OPUS) {
561             int err = ogg_build_opus_headers(st->codecpar, oggstream,
562                                              s->flags & AVFMT_FLAG_BITEXACT,
563                                              &st->metadata);
564             if (err) {
565                 av_log(s, AV_LOG_ERROR, "Error writing Opus headers\n");
566                 av_freep(&st->priv_data);
567                 return err;
568             }
569         } else if (st->codecpar->codec_id == AV_CODEC_ID_VP8) {
570             int err = ogg_build_vp8_headers(s, st, oggstream,
571                                             s->flags & AVFMT_FLAG_BITEXACT);
572             if (err) {
573                 av_log(s, AV_LOG_ERROR, "Error writing VP8 headers\n");
574                 av_freep(&st->priv_data);
575                 return err;
576             }
577         } else {
578             uint8_t *p;
579             const char *cstr = st->codecpar->codec_id == AV_CODEC_ID_VORBIS ? "vorbis" : "theora";
580             int header_type = st->codecpar->codec_id == AV_CODEC_ID_VORBIS ? 3 : 0x81;
581             int framing_bit = st->codecpar->codec_id == AV_CODEC_ID_VORBIS ? 1 : 0;
582
583             if (avpriv_split_xiph_headers(st->codecpar->extradata, st->codecpar->extradata_size,
584                                       st->codecpar->codec_id == AV_CODEC_ID_VORBIS ? 30 : 42,
585                                       (const uint8_t**)oggstream->header, oggstream->header_len) < 0) {
586                 av_log(s, AV_LOG_ERROR, "Extradata corrupted\n");
587                 av_freep(&st->priv_data);
588                 return AVERROR_INVALIDDATA;
589             }
590
591             p = ogg_write_vorbiscomment(7, s->flags & AVFMT_FLAG_BITEXACT,
592                                         &oggstream->header_len[1], &st->metadata,
593                                         framing_bit);
594             oggstream->header[1] = p;
595             if (!p)
596                 return AVERROR(ENOMEM);
597
598             bytestream_put_byte(&p, header_type);
599             bytestream_put_buffer(&p, cstr, 6);
600
601             if (st->codecpar->codec_id == AV_CODEC_ID_THEORA) {
602                 int den = AV_RB32(oggstream->header[0] + 22), num = AV_RB32(oggstream->header[0] + 26);
603                 /* Make sure to use time base stored in the Theora stream header to write
604                    correct timestamps */
605                 if (st->time_base.num != num || st->time_base.den != den) {
606                     av_log(s, AV_LOG_DEBUG, "Changing time base from %d/%d to %d/%d\n",
607                            st->time_base.num, st->time_base.den, num, den);
608                     avpriv_set_pts_info(st, 64, num, den);
609                 }
610                 /** KFGSHIFT is the width of the less significant section of the granule position
611                     The less significant section is the frame count since the last keyframe */
612                 oggstream->kfgshift = ((oggstream->header[0][40]&3)<<3)|(oggstream->header[0][41]>>5);
613                 oggstream->vrev = oggstream->header[0][9];
614                 av_log(s, AV_LOG_DEBUG, "theora kfgshift %d, vrev %d\n",
615                        oggstream->kfgshift, oggstream->vrev);
616             }
617         }
618     }
619
620     return 0;
621 }
622
623 static int ogg_write_header(AVFormatContext *s)
624 {
625     OGGStreamContext *oggstream = NULL;
626     int i, j;
627
628     for (j = 0; j < s->nb_streams; j++) {
629         oggstream = s->streams[j]->priv_data;
630         ogg_buffer_data(s, s->streams[j], oggstream->header[0],
631                         oggstream->header_len[0], 0, 1);
632         oggstream->page.flags |= 2; // bos
633         ogg_buffer_page(s, oggstream);
634     }
635     for (j = 0; j < s->nb_streams; j++) {
636         AVStream *st = s->streams[j];
637         oggstream = st->priv_data;
638         for (i = 1; i < 3; i++) {
639             if (oggstream->header_len[i])
640                 ogg_buffer_data(s, st, oggstream->header[i],
641                                 oggstream->header_len[i], 0, 1);
642         }
643         ogg_buffer_page(s, oggstream);
644     }
645
646     oggstream->page.start_granule = AV_NOPTS_VALUE;
647
648     ogg_write_pages(s, 2);
649
650     return 0;
651 }
652
653 static int ogg_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
654 {
655     AVStream *st = s->streams[pkt->stream_index];
656     OGGStreamContext *oggstream = st->priv_data;
657     int ret;
658     int64_t granule;
659
660     if (st->codecpar->codec_id == AV_CODEC_ID_THEORA) {
661         int64_t pts = oggstream->vrev < 1 ? pkt->pts : pkt->pts + pkt->duration;
662         int pframe_count;
663         if (pkt->flags & AV_PKT_FLAG_KEY)
664             oggstream->last_kf_pts = pts;
665         pframe_count = pts - oggstream->last_kf_pts;
666         // prevent frame count from overflow if key frame flag is not set
667         if (pframe_count >= (1<<oggstream->kfgshift)) {
668             oggstream->last_kf_pts += pframe_count;
669             pframe_count = 0;
670         }
671         granule = (oggstream->last_kf_pts<<oggstream->kfgshift) | pframe_count;
672     } else if (st->codecpar->codec_id == AV_CODEC_ID_OPUS)
673         granule = pkt->pts + pkt->duration +
674                   av_rescale_q(st->codecpar->initial_padding,
675                                (AVRational){ 1, st->codecpar->sample_rate },
676                                st->time_base);
677     else if (st->codecpar->codec_id == AV_CODEC_ID_VP8) {
678         int64_t pts, invcnt, dist;
679         int visible;
680
681         visible = (pkt->data[0] >> 4) & 1;
682         pts     = pkt->pts + pkt->duration;
683         invcnt  = (oggstream->last_granule >> 30) & 3;
684         invcnt  = visible ? 3 : (invcnt == 3 ? 0 : invcnt + 1);
685         dist    = (pkt->flags & AV_PKT_FLAG_KEY) ? 0 : ((oggstream->last_granule >> 3) & 0x07ffffff) + 1;
686
687         granule = (pts << 32) | (invcnt << 30) | (dist << 3);
688     } else
689         granule = pkt->pts + pkt->duration;
690
691     if (oggstream->page.start_granule == AV_NOPTS_VALUE)
692         oggstream->page.start_granule = pkt->pts;
693
694     ret = ogg_buffer_data(s, st, pkt->data, pkt->size, granule, 0);
695     if (ret < 0)
696         return ret;
697
698     ogg_write_pages(s, 0);
699
700     oggstream->last_granule = granule;
701
702     return 0;
703 }
704
705 static int ogg_write_packet(AVFormatContext *s, AVPacket *pkt)
706 {
707     int i;
708
709     if (pkt)
710         return ogg_write_packet_internal(s, pkt);
711
712     for (i = 0; i < s->nb_streams; i++) {
713         OGGStreamContext *oggstream = s->streams[i]->priv_data;
714         if (oggstream->page.segments_count)
715             ogg_buffer_page(s, oggstream);
716     }
717
718     ogg_write_pages(s, 2);
719     return 1;
720 }
721
722 static int ogg_write_trailer(AVFormatContext *s)
723 {
724     int i;
725
726     /* flush current page if needed */
727     for (i = 0; i < s->nb_streams; i++) {
728         OGGStreamContext *oggstream = s->streams[i]->priv_data;
729
730         if (oggstream->page.size > 0)
731             ogg_buffer_page(s, oggstream);
732     }
733
734     ogg_write_pages(s, 1);
735
736     return 0;
737 }
738
739 static void ogg_free(AVFormatContext *s)
740 {
741     int i;
742
743     for (i = 0; i < s->nb_streams; i++) {
744         AVStream *st = s->streams[i];
745         OGGStreamContext *oggstream = st->priv_data;
746         if (!oggstream)
747             continue;
748         if (st->codecpar->codec_id == AV_CODEC_ID_FLAC ||
749             st->codecpar->codec_id == AV_CODEC_ID_SPEEX ||
750             st->codecpar->codec_id == AV_CODEC_ID_OPUS ||
751             st->codecpar->codec_id == AV_CODEC_ID_VP8) {
752             av_freep(&oggstream->header[0]);
753         }
754         av_freep(&oggstream->header[1]);
755         av_freep(&st->priv_data);
756     }
757 }
758
759 #if CONFIG_OGG_MUXER
760 OGG_CLASS(ogg, Ogg)
761 AVOutputFormat ff_ogg_muxer = {
762     .name              = "ogg",
763     .long_name         = NULL_IF_CONFIG_SMALL("Ogg"),
764     .mime_type         = "application/ogg",
765     .extensions        = "ogg"
766 #if !CONFIG_OGV_MUXER
767                          ",ogv"
768 #endif
769 #if !CONFIG_SPX_MUXER
770                          ",spx"
771 #endif
772 #if !CONFIG_OPUS_MUXER
773                          ",opus"
774 #endif
775                          ,
776     .priv_data_size    = sizeof(OGGContext),
777     .audio_codec       = CONFIG_LIBVORBIS_ENCODER ?
778                          AV_CODEC_ID_VORBIS : AV_CODEC_ID_FLAC,
779     .video_codec       = AV_CODEC_ID_THEORA,
780     .init              = ogg_init,
781     .write_header      = ogg_write_header,
782     .write_packet      = ogg_write_packet,
783     .write_trailer     = ogg_write_trailer,
784     .deinit            = ogg_free,
785     .flags             = AVFMT_TS_NEGATIVE | AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
786     .priv_class        = &ogg_muxer_class,
787 };
788 #endif
789
790 #if CONFIG_OGA_MUXER
791 OGG_CLASS(oga, Ogg audio)
792 AVOutputFormat ff_oga_muxer = {
793     .name              = "oga",
794     .long_name         = NULL_IF_CONFIG_SMALL("Ogg Audio"),
795     .mime_type         = "audio/ogg",
796     .extensions        = "oga",
797     .priv_data_size    = sizeof(OGGContext),
798     .audio_codec       = AV_CODEC_ID_FLAC,
799     .init              = ogg_init,
800     .write_header      = ogg_write_header,
801     .write_packet      = ogg_write_packet,
802     .write_trailer     = ogg_write_trailer,
803     .deinit            = ogg_free,
804     .flags             = AVFMT_TS_NEGATIVE | AVFMT_ALLOW_FLUSH,
805     .priv_class        = &oga_muxer_class,
806 };
807 #endif
808
809 #if CONFIG_OGV_MUXER
810 OGG_CLASS(ogv, Ogg video)
811 AVOutputFormat ff_ogv_muxer = {
812     .name              = "ogv",
813     .long_name         = NULL_IF_CONFIG_SMALL("Ogg Video"),
814     .mime_type         = "video/ogg",
815     .extensions        = "ogv",
816     .priv_data_size    = sizeof(OGGContext),
817     .audio_codec       = CONFIG_LIBVORBIS_ENCODER ?
818                          AV_CODEC_ID_VORBIS : AV_CODEC_ID_FLAC,
819     .video_codec       = CONFIG_LIBTHEORA_ENCODER ?
820                          AV_CODEC_ID_THEORA : AV_CODEC_ID_VP8,
821     .init              = ogg_init,
822     .write_header      = ogg_write_header,
823     .write_packet      = ogg_write_packet,
824     .write_trailer     = ogg_write_trailer,
825     .deinit            = ogg_free,
826     .flags             = AVFMT_TS_NEGATIVE | AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,
827     .priv_class        = &ogv_muxer_class,
828 };
829 #endif
830
831 #if CONFIG_SPX_MUXER
832 OGG_CLASS(spx, Ogg Speex)
833 AVOutputFormat ff_spx_muxer = {
834     .name              = "spx",
835     .long_name         = NULL_IF_CONFIG_SMALL("Ogg Speex"),
836     .mime_type         = "audio/ogg",
837     .extensions        = "spx",
838     .priv_data_size    = sizeof(OGGContext),
839     .audio_codec       = AV_CODEC_ID_SPEEX,
840     .init              = ogg_init,
841     .write_header      = ogg_write_header,
842     .write_packet      = ogg_write_packet,
843     .write_trailer     = ogg_write_trailer,
844     .deinit            = ogg_free,
845     .flags             = AVFMT_TS_NEGATIVE | AVFMT_ALLOW_FLUSH,
846     .priv_class        = &spx_muxer_class,
847 };
848 #endif
849
850 #if CONFIG_OPUS_MUXER
851 OGG_CLASS(opus, Ogg Opus)
852 AVOutputFormat ff_opus_muxer = {
853     .name              = "opus",
854     .long_name         = NULL_IF_CONFIG_SMALL("Ogg Opus"),
855     .mime_type         = "audio/ogg",
856     .extensions        = "opus",
857     .priv_data_size    = sizeof(OGGContext),
858     .audio_codec       = AV_CODEC_ID_OPUS,
859     .init              = ogg_init,
860     .write_header      = ogg_write_header,
861     .write_packet      = ogg_write_packet,
862     .write_trailer     = ogg_write_trailer,
863     .deinit            = ogg_free,
864     .flags             = AVFMT_TS_NEGATIVE | AVFMT_ALLOW_FLUSH,
865     .priv_class        = &opus_muxer_class,
866 };
867 #endif