Statistics
| Branch: | Revision:

ffmpeg / libavformat / oggenc.c @ dc05b6af

History | View | Annotate | Download (16.8 KB)

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 "libavutil/crc.h"
23
#include "libavutil/opt.h"
24
#include "libavutil/random_seed.h"
25
#include "libavcodec/xiph.h"
26
#include "libavcodec/bytestream.h"
27
#include "libavcodec/flac.h"
28
#include "avformat.h"
29
#include "avio_internal.h"
30
#include "internal.h"
31
#include "vorbiscomment.h"
32

    
33
#define MAX_PAGE_SIZE 65025
34

    
35
typedef struct {
36
    int64_t granule;
37
    int stream_index;
38
    uint8_t flags;
39
    uint8_t segments_count;
40
    uint8_t segments[255];
41
    uint8_t data[MAX_PAGE_SIZE];
42
    uint16_t size;
43
} OGGPage;
44

    
45
typedef struct {
46
    unsigned page_counter;
47
    uint8_t *header[3];
48
    int header_len[3];
49
    /** for theora granule */
50
    int kfgshift;
51
    int64_t last_kf_pts;
52
    int vrev;
53
    int eos;
54
    unsigned page_count; ///< number of page buffered
55
    OGGPage page; ///< current page
56
    unsigned serial_num; ///< serial number
57
    int64_t last_granule; ///< last packet granule
58
} OGGStreamContext;
59

    
60
typedef struct OGGPageList {
61
    OGGPage page;
62
    struct OGGPageList *next;
63
} OGGPageList;
64

    
65
typedef struct {
66
    const AVClass *class;
67
    OGGPageList *page_list;
68
    int pref_size; ///< preferred page size (0 => fill all segments)
69
} OGGContext;
70

    
71

    
72
static const AVOption options[] = {
73
    { "oggpagesize", "Set preferred Ogg page size.",
74
      offsetof(OGGContext, pref_size), FF_OPT_TYPE_INT, 0, 0, MAX_PAGE_SIZE, AV_OPT_FLAG_ENCODING_PARAM},
75
    { NULL },
76
};
77

    
78
static const AVClass ogg_muxer_class = {
79
    "Ogg muxer",
80
    av_default_item_name,
81
    options,
82
    LIBAVUTIL_VERSION_INT,
83
};
84

    
85

    
86
static void ogg_update_checksum(AVFormatContext *s, AVIOContext *pb, int64_t crc_offset)
87
{
88
    int64_t pos = avio_tell(pb);
89
    uint32_t checksum = ffio_get_checksum(pb);
90
    avio_seek(pb, crc_offset, SEEK_SET);
91
    avio_wb32(pb, checksum);
92
    avio_seek(pb, pos, SEEK_SET);
93
}
94

    
95
static int ogg_write_page(AVFormatContext *s, OGGPage *page, int extra_flags)
96
{
97
    OGGStreamContext *oggstream = s->streams[page->stream_index]->priv_data;
98
    AVIOContext *pb;
99
    int64_t crc_offset;
100
    int ret, size;
101
    uint8_t *buf;
102

    
103
    ret = avio_open_dyn_buf(&pb);
104
    if (ret < 0)
105
        return ret;
106
    ffio_init_checksum(pb, ff_crc04C11DB7_update, 0);
107
    ffio_wfourcc(pb, "OggS");
108
    avio_w8(pb, 0);
109
    avio_w8(pb, page->flags | extra_flags);
110
    avio_wl64(pb, page->granule);
111
    avio_wl32(pb, oggstream->serial_num);
112
    avio_wl32(pb, oggstream->page_counter++);
113
    crc_offset = avio_tell(pb);
114
    avio_wl32(pb, 0); // crc
115
    avio_w8(pb, page->segments_count);
116
    avio_write(pb, page->segments, page->segments_count);
117
    avio_write(pb, page->data, page->size);
118

    
119
    ogg_update_checksum(s, pb, crc_offset);
120
    avio_flush(pb);
121

    
122
    size = avio_close_dyn_buf(pb, &buf);
123
    if (size < 0)
124
        return size;
125

    
126
    avio_write(s->pb, buf, size);
127
    avio_flush(s->pb);
128
    av_free(buf);
129
    oggstream->page_count--;
130
    return 0;
131
}
132

    
133
static int64_t ogg_granule_to_timestamp(OGGStreamContext *oggstream, int64_t granule)
134
{
135
    if (oggstream->kfgshift)
136
        return (granule>>oggstream->kfgshift) +
137
            (granule & ((1<<oggstream->kfgshift)-1));
138
    else
139
        return granule;
140
}
141

    
142
static int ogg_compare_granule(AVFormatContext *s, OGGPage *next, OGGPage *page)
143
{
144
    AVStream *st2 = s->streams[next->stream_index];
145
    AVStream *st  = s->streams[page->stream_index];
146
    int64_t next_granule, cur_granule;
147

    
148
    if (next->granule == -1 || page->granule == -1)
149
        return 0;
150

    
151
    next_granule = av_rescale_q(ogg_granule_to_timestamp(st2->priv_data, next->granule),
152
                                st2->time_base, AV_TIME_BASE_Q);
153
    cur_granule  = av_rescale_q(ogg_granule_to_timestamp(st->priv_data, page->granule),
154
                                st ->time_base, AV_TIME_BASE_Q);
155
    return next_granule > cur_granule;
156
}
157

    
158
static int ogg_reset_cur_page(OGGStreamContext *oggstream)
159
{
160
    oggstream->page.granule = -1;
161
    oggstream->page.flags = 0;
162
    oggstream->page.segments_count = 0;
163
    oggstream->page.size = 0;
164
    return 0;
165
}
166

    
167
static int ogg_buffer_page(AVFormatContext *s, OGGStreamContext *oggstream)
168
{
169
    OGGContext *ogg = s->priv_data;
170
    OGGPageList **p = &ogg->page_list;
171
    OGGPageList *l = av_mallocz(sizeof(*l));
172

    
173
    if (!l)
174
        return AVERROR(ENOMEM);
175
    l->page = oggstream->page;
176

    
177
    oggstream->page_count++;
178
    ogg_reset_cur_page(oggstream);
179

    
180
    while (*p) {
181
        if (ogg_compare_granule(s, &(*p)->page, &l->page))
182
            break;
183
        p = &(*p)->next;
184
    }
185
    l->next = *p;
186
    *p = l;
187

    
188
    return 0;
189
}
190

    
191
static int ogg_buffer_data(AVFormatContext *s, AVStream *st,
192
                           uint8_t *data, unsigned size, int64_t granule)
193
{
194
    OGGStreamContext *oggstream = st->priv_data;
195
    OGGContext *ogg = s->priv_data;
196
    int total_segments = size / 255 + 1;
197
    uint8_t *p = data;
198
    int i, segments, len, flush = 0;
199

    
200
    // Handles VFR by flushing page because this frame needs to have a timestamp
201
    if (st->codec->codec_id == CODEC_ID_THEORA &&
202
        ogg_granule_to_timestamp(oggstream, granule) >
203
        ogg_granule_to_timestamp(oggstream, oggstream->last_granule) + 1) {
204
        if (oggstream->page.granule != -1)
205
            ogg_buffer_page(s, oggstream);
206
        flush = 1;
207
    }
208

    
209
    for (i = 0; i < total_segments; ) {
210
        OGGPage *page = &oggstream->page;
211

    
212
        segments = FFMIN(total_segments - i, 255 - page->segments_count);
213

    
214
        if (i && !page->segments_count)
215
            page->flags |= 1; // continued packet
216

    
217
        memset(page->segments+page->segments_count, 255, segments - 1);
218
        page->segments_count += segments - 1;
219

    
220
        len = FFMIN(size, segments*255);
221
        page->segments[page->segments_count++] = len - (segments-1)*255;
222
        memcpy(page->data+page->size, p, len);
223
        p += len;
224
        size -= len;
225
        i += segments;
226
        page->size += len;
227

    
228
        if (i == total_segments)
229
            page->granule = granule;
230

    
231
        if(page->segments_count == 255 ||
232
           (ogg->pref_size > 0 && page->size >= ogg->pref_size)) {
233
           ogg_buffer_page(s, oggstream);
234
        }
235
    }
236

    
237
    if (flush && oggstream->page.granule != -1)
238
        ogg_buffer_page(s, oggstream);
239

    
240
    return 0;
241
}
242

    
243
static uint8_t *ogg_write_vorbiscomment(int offset, int bitexact,
244
                                        int *header_len, AVMetadata **m, int framing_bit)
245
{
246
    const char *vendor = bitexact ? "ffmpeg" : LIBAVFORMAT_IDENT;
247
    int size;
248
    uint8_t *p, *p0;
249
    unsigned int count;
250

    
251
    ff_metadata_conv(m, ff_vorbiscomment_metadata_conv, NULL);
252

    
253
    size = offset + ff_vorbiscomment_length(*m, vendor, &count) + framing_bit;
254
    p = av_mallocz(size);
255
    if (!p)
256
        return NULL;
257
    p0 = p;
258

    
259
    p += offset;
260
    ff_vorbiscomment_write(&p, m, vendor, count);
261
    if (framing_bit)
262
        bytestream_put_byte(&p, 1);
263

    
264
    *header_len = size;
265
    return p0;
266
}
267

    
268
static int ogg_build_flac_headers(AVCodecContext *avctx,
269
                                  OGGStreamContext *oggstream, int bitexact,
270
                                  AVMetadata **m)
271
{
272
    enum FLACExtradataFormat format;
273
    uint8_t *streaminfo;
274
    uint8_t *p;
275

    
276
    if (!ff_flac_is_extradata_valid(avctx, &format, &streaminfo))
277
        return -1;
278

    
279
    // first packet: STREAMINFO
280
    oggstream->header_len[0] = 51;
281
    oggstream->header[0] = av_mallocz(51); // per ogg flac specs
282
    p = oggstream->header[0];
283
    if (!p)
284
        return AVERROR(ENOMEM);
285
    bytestream_put_byte(&p, 0x7F);
286
    bytestream_put_buffer(&p, "FLAC", 4);
287
    bytestream_put_byte(&p, 1); // major version
288
    bytestream_put_byte(&p, 0); // minor version
289
    bytestream_put_be16(&p, 1); // headers packets without this one
290
    bytestream_put_buffer(&p, "fLaC", 4);
291
    bytestream_put_byte(&p, 0x00); // streaminfo
292
    bytestream_put_be24(&p, 34);
293
    bytestream_put_buffer(&p, streaminfo, FLAC_STREAMINFO_SIZE);
294

    
295
    // second packet: VorbisComment
296
    p = ogg_write_vorbiscomment(4, bitexact, &oggstream->header_len[1], m, 0);
297
    if (!p)
298
        return AVERROR(ENOMEM);
299
    oggstream->header[1] = p;
300
    bytestream_put_byte(&p, 0x84); // last metadata block and vorbis comment
301
    bytestream_put_be24(&p, oggstream->header_len[1] - 4);
302

    
303
    return 0;
304
}
305

    
306
#define SPEEX_HEADER_SIZE 80
307

    
308
static int ogg_build_speex_headers(AVCodecContext *avctx,
309
                                   OGGStreamContext *oggstream, int bitexact,
310
                                   AVMetadata **m)
311
{
312
    uint8_t *p;
313

    
314
    if (avctx->extradata_size < SPEEX_HEADER_SIZE)
315
        return -1;
316

    
317
    // first packet: Speex header
318
    p = av_mallocz(SPEEX_HEADER_SIZE);
319
    if (!p)
320
        return AVERROR(ENOMEM);
321
    oggstream->header[0] = p;
322
    oggstream->header_len[0] = SPEEX_HEADER_SIZE;
323
    bytestream_put_buffer(&p, avctx->extradata, SPEEX_HEADER_SIZE);
324
    AV_WL32(&oggstream->header[0][68], 0);  // set extra_headers to 0
325

    
326
    // second packet: VorbisComment
327
    p = ogg_write_vorbiscomment(0, bitexact, &oggstream->header_len[1], m, 0);
328
    if (!p)
329
        return AVERROR(ENOMEM);
330
    oggstream->header[1] = p;
331

    
332
    return 0;
333
}
334

    
335
static int ogg_write_header(AVFormatContext *s)
336
{
337
    OGGStreamContext *oggstream;
338
    int i, j;
339

    
340
    for (i = 0; i < s->nb_streams; i++) {
341
        AVStream *st = s->streams[i];
342
        unsigned serial_num = i;
343

    
344
        if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO)
345
            av_set_pts_info(st, 64, 1, st->codec->sample_rate);
346
        else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO)
347
            av_set_pts_info(st, 64, st->codec->time_base.num, st->codec->time_base.den);
348
        if (st->codec->codec_id != CODEC_ID_VORBIS &&
349
            st->codec->codec_id != CODEC_ID_THEORA &&
350
            st->codec->codec_id != CODEC_ID_SPEEX  &&
351
            st->codec->codec_id != CODEC_ID_FLAC) {
352
            av_log(s, AV_LOG_ERROR, "Unsupported codec id in stream %d\n", i);
353
            return -1;
354
        }
355

    
356
        if (!st->codec->extradata || !st->codec->extradata_size) {
357
            av_log(s, AV_LOG_ERROR, "No extradata present\n");
358
            return -1;
359
        }
360
        oggstream = av_mallocz(sizeof(*oggstream));
361
        oggstream->page.stream_index = i;
362

    
363
        if (!(st->codec->flags & CODEC_FLAG_BITEXACT))
364
            do {
365
                serial_num = av_get_random_seed();
366
                for (j = 0; j < i; j++) {
367
                    OGGStreamContext *sc = s->streams[j]->priv_data;
368
                    if (serial_num == sc->serial_num)
369
                        break;
370
                }
371
            } while (j < i);
372
        oggstream->serial_num = serial_num;
373

    
374
        st->priv_data = oggstream;
375
        if (st->codec->codec_id == CODEC_ID_FLAC) {
376
            int err = ogg_build_flac_headers(st->codec, oggstream,
377
                                             st->codec->flags & CODEC_FLAG_BITEXACT,
378
                                             &s->metadata);
379
            if (err) {
380
                av_log(s, AV_LOG_ERROR, "Error writing FLAC headers\n");
381
                av_freep(&st->priv_data);
382
                return err;
383
            }
384
        } else if (st->codec->codec_id == CODEC_ID_SPEEX) {
385
            int err = ogg_build_speex_headers(st->codec, oggstream,
386
                                              st->codec->flags & CODEC_FLAG_BITEXACT,
387
                                              &s->metadata);
388
            if (err) {
389
                av_log(s, AV_LOG_ERROR, "Error writing Speex headers\n");
390
                av_freep(&st->priv_data);
391
                return err;
392
            }
393
        } else {
394
            uint8_t *p;
395
            const char *cstr = st->codec->codec_id == CODEC_ID_VORBIS ? "vorbis" : "theora";
396
            int header_type = st->codec->codec_id == CODEC_ID_VORBIS ? 3 : 0x81;
397
            int framing_bit = st->codec->codec_id == CODEC_ID_VORBIS ? 1 : 0;
398

    
399
            if (ff_split_xiph_headers(st->codec->extradata, st->codec->extradata_size,
400
                                      st->codec->codec_id == CODEC_ID_VORBIS ? 30 : 42,
401
                                      oggstream->header, oggstream->header_len) < 0) {
402
                av_log(s, AV_LOG_ERROR, "Extradata corrupted\n");
403
                av_freep(&st->priv_data);
404
                return -1;
405
            }
406

    
407
            p = ogg_write_vorbiscomment(7, st->codec->flags & CODEC_FLAG_BITEXACT,
408
                                        &oggstream->header_len[1], &s->metadata,
409
                                        framing_bit);
410
            if (!p)
411
                return AVERROR(ENOMEM);
412

    
413
            oggstream->header[1] = p;
414
            bytestream_put_byte(&p, header_type);
415
            bytestream_put_buffer(&p, cstr, 6);
416

    
417
            if (st->codec->codec_id == CODEC_ID_THEORA) {
418
                /** KFGSHIFT is the width of the less significant section of the granule position
419
                    The less significant section is the frame count since the last keyframe */
420
                oggstream->kfgshift = ((oggstream->header[0][40]&3)<<3)|(oggstream->header[0][41]>>5);
421
                oggstream->vrev = oggstream->header[0][9];
422
                av_log(s, AV_LOG_DEBUG, "theora kfgshift %d, vrev %d\n",
423
                       oggstream->kfgshift, oggstream->vrev);
424
            }
425
        }
426
    }
427

    
428
    for (j = 0; j < s->nb_streams; j++) {
429
        OGGStreamContext *oggstream = s->streams[j]->priv_data;
430
        ogg_buffer_data(s, s->streams[j], oggstream->header[0],
431
                        oggstream->header_len[0], 0);
432
        oggstream->page.flags |= 2; // bos
433
        ogg_buffer_page(s, oggstream);
434
    }
435
    for (j = 0; j < s->nb_streams; j++) {
436
        AVStream *st = s->streams[j];
437
        OGGStreamContext *oggstream = st->priv_data;
438
        for (i = 1; i < 3; i++) {
439
            if (oggstream && oggstream->header_len[i])
440
                ogg_buffer_data(s, st, oggstream->header[i],
441
                                oggstream->header_len[i], 0);
442
        }
443
        ogg_buffer_page(s, oggstream);
444
    }
445
    return 0;
446
}
447

    
448
static void ogg_write_pages(AVFormatContext *s, int flush)
449
{
450
    OGGContext *ogg = s->priv_data;
451
    OGGPageList *next, *p;
452

    
453
    if (!ogg->page_list)
454
        return;
455

    
456
    for (p = ogg->page_list; p; ) {
457
        OGGStreamContext *oggstream =
458
            s->streams[p->page.stream_index]->priv_data;
459
        if (oggstream->page_count < 2 && !flush)
460
            break;
461
        ogg_write_page(s, &p->page,
462
                       flush && oggstream->page_count == 1 ? 4 : 0); // eos
463
        next = p->next;
464
        av_freep(&p);
465
        p = next;
466
    }
467
    ogg->page_list = p;
468
}
469

    
470
static int ogg_write_packet(AVFormatContext *s, AVPacket *pkt)
471
{
472
    AVStream *st = s->streams[pkt->stream_index];
473
    OGGStreamContext *oggstream = st->priv_data;
474
    int ret;
475
    int64_t granule;
476

    
477
    if (st->codec->codec_id == CODEC_ID_THEORA) {
478
        int64_t pts = oggstream->vrev < 1 ? pkt->pts : pkt->pts + pkt->duration;
479
        int pframe_count;
480
        if (pkt->flags & AV_PKT_FLAG_KEY)
481
            oggstream->last_kf_pts = pts;
482
        pframe_count = pts - oggstream->last_kf_pts;
483
        // prevent frame count from overflow if key frame flag is not set
484
        if (pframe_count >= (1<<oggstream->kfgshift)) {
485
            oggstream->last_kf_pts += pframe_count;
486
            pframe_count = 0;
487
        }
488
        granule = (oggstream->last_kf_pts<<oggstream->kfgshift) | pframe_count;
489
    } else
490
        granule = pkt->pts + pkt->duration;
491

    
492
    ret = ogg_buffer_data(s, st, pkt->data, pkt->size, granule);
493
    if (ret < 0)
494
        return ret;
495

    
496
    ogg_write_pages(s, 0);
497

    
498
    oggstream->last_granule = granule;
499

    
500
    return 0;
501
}
502

    
503
static int ogg_write_trailer(AVFormatContext *s)
504
{
505
    int i;
506

    
507
    /* flush current page */
508
    for (i = 0; i < s->nb_streams; i++)
509
        ogg_buffer_page(s, s->streams[i]->priv_data);
510

    
511
    ogg_write_pages(s, 1);
512

    
513
    for (i = 0; i < s->nb_streams; i++) {
514
        AVStream *st = s->streams[i];
515
        OGGStreamContext *oggstream = st->priv_data;
516
        if (st->codec->codec_id == CODEC_ID_FLAC ||
517
            st->codec->codec_id == CODEC_ID_SPEEX) {
518
            av_free(oggstream->header[0]);
519
            av_free(oggstream->header[1]);
520
        }
521
        av_freep(&st->priv_data);
522
    }
523
    return 0;
524
}
525

    
526
AVOutputFormat ff_ogg_muxer = {
527
    "ogg",
528
    NULL_IF_CONFIG_SMALL("Ogg"),
529
    "application/ogg",
530
    "ogg,ogv,spx",
531
    sizeof(OGGContext),
532
    CODEC_ID_FLAC,
533
    CODEC_ID_THEORA,
534
    ogg_write_header,
535
    ogg_write_packet,
536
    ogg_write_trailer,
537
    .priv_class = &ogg_muxer_class,
538
};