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ffmpeg / libavformat / flvdec.c @ e3c007bb

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1
/*
2
 * FLV demuxer
3
 * Copyright (c) 2003 The Libav Project
4
 *
5
 * This demuxer will generate a 1 byte extradata for VP6F content.
6
 * It is composed of:
7
 *  - upper 4bits: difference between encoded width and visible width
8
 *  - lower 4bits: difference between encoded height and visible height
9
 *
10
 * This file is part of Libav.
11
 *
12
 * Libav is free software; you can redistribute it and/or
13
 * modify it under the terms of the GNU Lesser General Public
14
 * License as published by the Free Software Foundation; either
15
 * version 2.1 of the License, or (at your option) any later version.
16
 *
17
 * Libav is distributed in the hope that it will be useful,
18
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
20
 * Lesser General Public License for more details.
21
 *
22
 * You should have received a copy of the GNU Lesser General Public
23
 * License along with Libav; if not, write to the Free Software
24
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25
 */
26

    
27
#include "libavutil/avstring.h"
28
#include "libavcodec/bytestream.h"
29
#include "libavcodec/mpeg4audio.h"
30
#include "avformat.h"
31
#include "avio_internal.h"
32
#include "flv.h"
33

    
34
#define KEYFRAMES_TAG            "keyframes"
35
#define KEYFRAMES_TIMESTAMP_TAG  "times"
36
#define KEYFRAMES_BYTEOFFSET_TAG "filepositions"
37

    
38
typedef struct {
39
    int wrong_dts; ///< wrong dts due to negative cts
40
} FLVContext;
41

    
42
static int flv_probe(AVProbeData *p)
43
{
44
    const uint8_t *d;
45

    
46
    d = p->buf;
47
    if (d[0] == 'F' && d[1] == 'L' && d[2] == 'V' && d[3] < 5 && d[5]==0 && AV_RB32(d+5)>8) {
48
        return AVPROBE_SCORE_MAX;
49
    }
50
    return 0;
51
}
52

    
53
static void flv_set_audio_codec(AVFormatContext *s, AVStream *astream, int flv_codecid) {
54
    AVCodecContext *acodec = astream->codec;
55
    switch(flv_codecid) {
56
        //no distinction between S16 and S8 PCM codec flags
57
        case FLV_CODECID_PCM:
58
            acodec->codec_id = acodec->bits_per_coded_sample == 8 ? CODEC_ID_PCM_U8 :
59
#if HAVE_BIGENDIAN
60
                                CODEC_ID_PCM_S16BE;
61
#else
62
                                CODEC_ID_PCM_S16LE;
63
#endif
64
            break;
65
        case FLV_CODECID_PCM_LE:
66
            acodec->codec_id = acodec->bits_per_coded_sample == 8 ? CODEC_ID_PCM_U8 : CODEC_ID_PCM_S16LE; break;
67
        case FLV_CODECID_AAC  : acodec->codec_id = CODEC_ID_AAC;                                    break;
68
        case FLV_CODECID_ADPCM: acodec->codec_id = CODEC_ID_ADPCM_SWF;                              break;
69
        case FLV_CODECID_SPEEX:
70
            acodec->codec_id = CODEC_ID_SPEEX;
71
            acodec->sample_rate = 16000;
72
            break;
73
        case FLV_CODECID_MP3  : acodec->codec_id = CODEC_ID_MP3      ; astream->need_parsing = AVSTREAM_PARSE_FULL; break;
74
        case FLV_CODECID_NELLYMOSER_8KHZ_MONO:
75
            acodec->sample_rate = 8000; //in case metadata does not otherwise declare samplerate
76
            acodec->codec_id = CODEC_ID_NELLYMOSER;
77
            break;
78
        case FLV_CODECID_NELLYMOSER_16KHZ_MONO:
79
            acodec->sample_rate = 16000;
80
            acodec->codec_id = CODEC_ID_NELLYMOSER;
81
            break;
82
        case FLV_CODECID_NELLYMOSER:
83
            acodec->codec_id = CODEC_ID_NELLYMOSER;
84
            break;
85
        default:
86
            av_log(s, AV_LOG_INFO, "Unsupported audio codec (%x)\n", flv_codecid >> FLV_AUDIO_CODECID_OFFSET);
87
            acodec->codec_tag = flv_codecid >> FLV_AUDIO_CODECID_OFFSET;
88
    }
89
}
90

    
91
static int flv_set_video_codec(AVFormatContext *s, AVStream *vstream, int flv_codecid) {
92
    AVCodecContext *vcodec = vstream->codec;
93
    switch(flv_codecid) {
94
        case FLV_CODECID_H263  : vcodec->codec_id = CODEC_ID_FLV1   ; break;
95
        case FLV_CODECID_SCREEN: vcodec->codec_id = CODEC_ID_FLASHSV; break;
96
        case FLV_CODECID_SCREEN2: vcodec->codec_id = CODEC_ID_FLASHSV2; break;
97
        case FLV_CODECID_VP6   : vcodec->codec_id = CODEC_ID_VP6F   ;
98
        case FLV_CODECID_VP6A  :
99
            if(flv_codecid == FLV_CODECID_VP6A)
100
                vcodec->codec_id = CODEC_ID_VP6A;
101
            if(vcodec->extradata_size != 1) {
102
                vcodec->extradata_size = 1;
103
                vcodec->extradata = av_malloc(1);
104
            }
105
            vcodec->extradata[0] = avio_r8(s->pb);
106
            return 1; // 1 byte body size adjustment for flv_read_packet()
107
        case FLV_CODECID_H264:
108
            vcodec->codec_id = CODEC_ID_H264;
109
            return 3; // not 4, reading packet type will consume one byte
110
        default:
111
            av_log(s, AV_LOG_INFO, "Unsupported video codec (%x)\n", flv_codecid);
112
            vcodec->codec_tag = flv_codecid;
113
    }
114

    
115
    return 0;
116
}
117

    
118
static int amf_get_string(AVIOContext *ioc, char *buffer, int buffsize) {
119
    int length = avio_rb16(ioc);
120
    if(length >= buffsize) {
121
        avio_skip(ioc, length);
122
        return -1;
123
    }
124

    
125
    avio_read(ioc, buffer, length);
126

    
127
    buffer[length] = '\0';
128

    
129
    return length;
130
}
131

    
132
static int parse_keyframes_index(AVFormatContext *s, AVIOContext *ioc, AVStream *vstream, int64_t max_pos) {
133
    unsigned int arraylen = 0, timeslen = 0, fileposlen = 0, i;
134
    double num_val;
135
    char str_val[256];
136
    int64_t *times = NULL;
137
    int64_t *filepositions = NULL;
138
    int ret = 0;
139

    
140
    while (avio_tell(ioc) < max_pos - 2 && amf_get_string(ioc, str_val, sizeof(str_val)) > 0) {
141
        int64_t* current_array;
142

    
143
        // Expect array object in context
144
        if (avio_r8(ioc) != AMF_DATA_TYPE_ARRAY)
145
            break;
146

    
147
        arraylen = avio_rb32(ioc);
148
        /*
149
         * Expect only 'times' or 'filepositions' sub-arrays in other case refuse to use such metadata
150
         * for indexing
151
         */
152
        if (!strcmp(KEYFRAMES_TIMESTAMP_TAG, str_val) && !times) {
153
            if (!(times = av_mallocz(sizeof(*times) * arraylen))) {
154
                ret = AVERROR(ENOMEM);
155
                goto finish;
156
            }
157
            timeslen = arraylen;
158
            current_array = times;
159
        } else if (!strcmp(KEYFRAMES_BYTEOFFSET_TAG, str_val) && !filepositions) {
160
            if (!(filepositions = av_mallocz(sizeof(*filepositions) * arraylen))) {
161
                ret = AVERROR(ENOMEM);
162
                goto finish;
163
            }
164
            fileposlen = arraylen;
165
            current_array = filepositions;
166
        } else // unexpected metatag inside keyframes, will not use such metadata for indexing
167
            break;
168

    
169
        for (i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++) {
170
            if (avio_r8(ioc) != AMF_DATA_TYPE_NUMBER)
171
                goto finish;
172
            num_val = av_int2dbl(avio_rb64(ioc));
173
            current_array[i] = num_val;
174
        }
175
    }
176

    
177
    if (timeslen == fileposlen)
178
         for(i = 0; i < arraylen; i++)
179
             av_add_index_entry(vstream, filepositions[i], times[i]*1000, 0, 0, AVINDEX_KEYFRAME);
180
    else
181
        av_log(s, AV_LOG_WARNING, "Invalid keyframes object, skipping.\n");
182

    
183
finish:
184
    av_freep(&times);
185
    av_freep(&filepositions);
186
    avio_seek(ioc, max_pos, SEEK_SET);
187
    return ret;
188
}
189

    
190
static int amf_parse_object(AVFormatContext *s, AVStream *astream, AVStream *vstream, const char *key, int64_t max_pos, int depth) {
191
    AVCodecContext *acodec, *vcodec;
192
    AVIOContext *ioc;
193
    AMFDataType amf_type;
194
    char str_val[256];
195
    double num_val;
196

    
197
    num_val = 0;
198
    ioc = s->pb;
199

    
200
    amf_type = avio_r8(ioc);
201

    
202
    switch(amf_type) {
203
        case AMF_DATA_TYPE_NUMBER:
204
            num_val = av_int2dbl(avio_rb64(ioc)); break;
205
        case AMF_DATA_TYPE_BOOL:
206
            num_val = avio_r8(ioc); break;
207
        case AMF_DATA_TYPE_STRING:
208
            if(amf_get_string(ioc, str_val, sizeof(str_val)) < 0)
209
                return -1;
210
            break;
211
        case AMF_DATA_TYPE_OBJECT: {
212
            unsigned int keylen;
213

    
214
            if (key && !strcmp(KEYFRAMES_TAG, key) && depth == 1)
215
                if (parse_keyframes_index(s, ioc, vstream, max_pos) < 0)
216
                    return -1;
217

    
218
            while(avio_tell(ioc) < max_pos - 2 && (keylen = avio_rb16(ioc))) {
219
                avio_skip(ioc, keylen); //skip key string
220
                if(amf_parse_object(s, NULL, NULL, NULL, max_pos, depth + 1) < 0)
221
                    return -1; //if we couldn't skip, bomb out.
222
            }
223
            if(avio_r8(ioc) != AMF_END_OF_OBJECT)
224
                return -1;
225
        }
226
            break;
227
        case AMF_DATA_TYPE_NULL:
228
        case AMF_DATA_TYPE_UNDEFINED:
229
        case AMF_DATA_TYPE_UNSUPPORTED:
230
            break; //these take up no additional space
231
        case AMF_DATA_TYPE_MIXEDARRAY:
232
            avio_skip(ioc, 4); //skip 32-bit max array index
233
            while(avio_tell(ioc) < max_pos - 2 && amf_get_string(ioc, str_val, sizeof(str_val)) > 0) {
234
                //this is the only case in which we would want a nested parse to not skip over the object
235
                if(amf_parse_object(s, astream, vstream, str_val, max_pos, depth + 1) < 0)
236
                    return -1;
237
            }
238
            if(avio_r8(ioc) != AMF_END_OF_OBJECT)
239
                return -1;
240
            break;
241
        case AMF_DATA_TYPE_ARRAY: {
242
            unsigned int arraylen, i;
243

    
244
            arraylen = avio_rb32(ioc);
245
            for(i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++) {
246
                if(amf_parse_object(s, NULL, NULL, NULL, max_pos, depth + 1) < 0)
247
                    return -1; //if we couldn't skip, bomb out.
248
            }
249
        }
250
            break;
251
        case AMF_DATA_TYPE_DATE:
252
            avio_skip(ioc, 8 + 2); //timestamp (double) and UTC offset (int16)
253
            break;
254
        default: //unsupported type, we couldn't skip
255
            return -1;
256
    }
257

    
258
    if(depth == 1 && key) { //only look for metadata values when we are not nested and key != NULL
259
        acodec = astream ? astream->codec : NULL;
260
        vcodec = vstream ? vstream->codec : NULL;
261

    
262
        if(amf_type == AMF_DATA_TYPE_BOOL) {
263
            av_strlcpy(str_val, num_val > 0 ? "true" : "false", sizeof(str_val));
264
            av_metadata_set2(&s->metadata, key, str_val, 0);
265
        } else if(amf_type == AMF_DATA_TYPE_NUMBER) {
266
            snprintf(str_val, sizeof(str_val), "%.f", num_val);
267
            av_metadata_set2(&s->metadata, key, str_val, 0);
268
            if(!strcmp(key, "duration")) s->duration = num_val * AV_TIME_BASE;
269
            else if(!strcmp(key, "videodatarate") && vcodec && 0 <= (int)(num_val * 1024.0))
270
                vcodec->bit_rate = num_val * 1024.0;
271
            else if(!strcmp(key, "audiodatarate") && acodec && 0 <= (int)(num_val * 1024.0))
272
                acodec->bit_rate = num_val * 1024.0;
273
        } else if (amf_type == AMF_DATA_TYPE_STRING)
274
            av_metadata_set2(&s->metadata, key, str_val, 0);
275
    }
276

    
277
    return 0;
278
}
279

    
280
static int flv_read_metabody(AVFormatContext *s, int64_t next_pos) {
281
    AMFDataType type;
282
    AVStream *stream, *astream, *vstream;
283
    AVIOContext *ioc;
284
    int i;
285
    char buffer[11]; //only needs to hold the string "onMetaData". Anything longer is something we don't want.
286

    
287
    astream = NULL;
288
    vstream = NULL;
289
    ioc = s->pb;
290

    
291
    //first object needs to be "onMetaData" string
292
    type = avio_r8(ioc);
293
    if(type != AMF_DATA_TYPE_STRING || amf_get_string(ioc, buffer, sizeof(buffer)) < 0 || strcmp(buffer, "onMetaData"))
294
        return -1;
295

    
296
    //find the streams now so that amf_parse_object doesn't need to do the lookup every time it is called.
297
    for(i = 0; i < s->nb_streams; i++) {
298
        stream = s->streams[i];
299
        if     (stream->codec->codec_type == AVMEDIA_TYPE_AUDIO) astream = stream;
300
        else if(stream->codec->codec_type == AVMEDIA_TYPE_VIDEO) vstream = stream;
301
    }
302

    
303
    //parse the second object (we want a mixed array)
304
    if(amf_parse_object(s, astream, vstream, buffer, next_pos, 0) < 0)
305
        return -1;
306

    
307
    return 0;
308
}
309

    
310
static AVStream *create_stream(AVFormatContext *s, int is_audio){
311
    AVStream *st = av_new_stream(s, is_audio);
312
    if (!st)
313
        return NULL;
314
    st->codec->codec_type = is_audio ? AVMEDIA_TYPE_AUDIO : AVMEDIA_TYPE_VIDEO;
315
    av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
316
    return st;
317
}
318

    
319
static int flv_read_header(AVFormatContext *s,
320
                           AVFormatParameters *ap)
321
{
322
    int offset, flags;
323

    
324
    avio_skip(s->pb, 4);
325
    flags = avio_r8(s->pb);
326
    /* old flvtool cleared this field */
327
    /* FIXME: better fix needed */
328
    if (!flags) {
329
        flags = FLV_HEADER_FLAG_HASVIDEO | FLV_HEADER_FLAG_HASAUDIO;
330
        av_log(s, AV_LOG_WARNING, "Broken FLV file, which says no streams present, this might fail\n");
331
    }
332

    
333
    if((flags & (FLV_HEADER_FLAG_HASVIDEO|FLV_HEADER_FLAG_HASAUDIO))
334
             != (FLV_HEADER_FLAG_HASVIDEO|FLV_HEADER_FLAG_HASAUDIO))
335
        s->ctx_flags |= AVFMTCTX_NOHEADER;
336

    
337
    if(flags & FLV_HEADER_FLAG_HASVIDEO){
338
        if(!create_stream(s, 0))
339
            return AVERROR(ENOMEM);
340
    }
341
    if(flags & FLV_HEADER_FLAG_HASAUDIO){
342
        if(!create_stream(s, 1))
343
            return AVERROR(ENOMEM);
344
    }
345

    
346
    offset = avio_rb32(s->pb);
347
    avio_seek(s->pb, offset, SEEK_SET);
348
    avio_skip(s->pb, 4);
349

    
350
    s->start_time = 0;
351

    
352
    return 0;
353
}
354

    
355
static int flv_get_extradata(AVFormatContext *s, AVStream *st, int size)
356
{
357
    av_free(st->codec->extradata);
358
    st->codec->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);
359
    if (!st->codec->extradata)
360
        return AVERROR(ENOMEM);
361
    st->codec->extradata_size = size;
362
    avio_read(s->pb, st->codec->extradata, st->codec->extradata_size);
363
    return 0;
364
}
365

    
366
static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
367
{
368
    FLVContext *flv = s->priv_data;
369
    int ret, i, type, size, flags, is_audio;
370
    int64_t next, pos;
371
    int64_t dts, pts = AV_NOPTS_VALUE;
372
    AVStream *st = NULL;
373

    
374
 for(;;avio_skip(s->pb, 4)){ /* pkt size is repeated at end. skip it */
375
    pos = avio_tell(s->pb);
376
    type = avio_r8(s->pb);
377
    size = avio_rb24(s->pb);
378
    dts = avio_rb24(s->pb);
379
    dts |= avio_r8(s->pb) << 24;
380
//    av_log(s, AV_LOG_DEBUG, "type:%d, size:%d, dts:%d\n", type, size, dts);
381
    if (s->pb->eof_reached)
382
        return AVERROR_EOF;
383
    avio_skip(s->pb, 3); /* stream id, always 0 */
384
    flags = 0;
385

    
386
    if(size == 0)
387
        continue;
388

    
389
    next= size + avio_tell(s->pb);
390

    
391
    if (type == FLV_TAG_TYPE_AUDIO) {
392
        is_audio=1;
393
        flags = avio_r8(s->pb);
394
        size--;
395
    } else if (type == FLV_TAG_TYPE_VIDEO) {
396
        is_audio=0;
397
        flags = avio_r8(s->pb);
398
        size--;
399
        if ((flags & 0xf0) == 0x50) /* video info / command frame */
400
            goto skip;
401
    } else {
402
        if (type == FLV_TAG_TYPE_META && size > 13+1+4)
403
            flv_read_metabody(s, next);
404
        else /* skip packet */
405
            av_log(s, AV_LOG_DEBUG, "skipping flv packet: type %d, size %d, flags %d\n", type, size, flags);
406
    skip:
407
        avio_seek(s->pb, next, SEEK_SET);
408
        continue;
409
    }
410

    
411
    /* skip empty data packets */
412
    if (!size)
413
        continue;
414

    
415
    /* now find stream */
416
    for(i=0;i<s->nb_streams;i++) {
417
        st = s->streams[i];
418
        if (st->id == is_audio)
419
            break;
420
    }
421
    if(i == s->nb_streams){
422
        av_log(s, AV_LOG_ERROR, "invalid stream\n");
423
        st= create_stream(s, is_audio);
424
        s->ctx_flags &= ~AVFMTCTX_NOHEADER;
425
    }
426
//    av_log(s, AV_LOG_DEBUG, "%d %X %d \n", is_audio, flags, st->discard);
427
    if(  (st->discard >= AVDISCARD_NONKEY && !((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY ||         is_audio))
428
       ||(st->discard >= AVDISCARD_BIDIR  &&  ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_DISP_INTER && !is_audio))
429
       || st->discard >= AVDISCARD_ALL
430
       ){
431
        avio_seek(s->pb, next, SEEK_SET);
432
        continue;
433
    }
434
    if ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY)
435
        av_add_index_entry(st, pos, dts, size, 0, AVINDEX_KEYFRAME);
436
    break;
437
 }
438

    
439
    // if not streamed and no duration from metadata then seek to end to find the duration from the timestamps
440
    if(s->pb->seekable && (!s->duration || s->duration==AV_NOPTS_VALUE)){
441
        int size;
442
        const int64_t pos= avio_tell(s->pb);
443
        const int64_t fsize= avio_size(s->pb);
444
        avio_seek(s->pb, fsize-4, SEEK_SET);
445
        size= avio_rb32(s->pb);
446
        avio_seek(s->pb, fsize-3-size, SEEK_SET);
447
        if(size == avio_rb24(s->pb) + 11){
448
            uint32_t ts = avio_rb24(s->pb);
449
            ts |= avio_r8(s->pb) << 24;
450
            s->duration = ts * (int64_t)AV_TIME_BASE / 1000;
451
        }
452
        avio_seek(s->pb, pos, SEEK_SET);
453
    }
454

    
455
    if(is_audio){
456
        if(!st->codec->channels || !st->codec->sample_rate || !st->codec->bits_per_coded_sample) {
457
            st->codec->channels = (flags & FLV_AUDIO_CHANNEL_MASK) == FLV_STEREO ? 2 : 1;
458
            st->codec->sample_rate = (44100 << ((flags & FLV_AUDIO_SAMPLERATE_MASK) >> FLV_AUDIO_SAMPLERATE_OFFSET) >> 3);
459
            st->codec->bits_per_coded_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;
460
        }
461
        if(!st->codec->codec_id){
462
            flv_set_audio_codec(s, st, flags & FLV_AUDIO_CODECID_MASK);
463
        }
464
    }else{
465
        size -= flv_set_video_codec(s, st, flags & FLV_VIDEO_CODECID_MASK);
466
    }
467

    
468
    if (st->codec->codec_id == CODEC_ID_AAC ||
469
        st->codec->codec_id == CODEC_ID_H264) {
470
        int type = avio_r8(s->pb);
471
        size--;
472
        if (st->codec->codec_id == CODEC_ID_H264) {
473
            int32_t cts = (avio_rb24(s->pb)+0xff800000)^0xff800000; // sign extension
474
            pts = dts + cts;
475
            if (cts < 0) { // dts are wrong
476
                flv->wrong_dts = 1;
477
                av_log(s, AV_LOG_WARNING, "negative cts, previous timestamps might be wrong\n");
478
            }
479
            if (flv->wrong_dts)
480
                dts = AV_NOPTS_VALUE;
481
        }
482
        if (type == 0) {
483
            if ((ret = flv_get_extradata(s, st, size)) < 0)
484
                return ret;
485
            if (st->codec->codec_id == CODEC_ID_AAC) {
486
                MPEG4AudioConfig cfg;
487
                ff_mpeg4audio_get_config(&cfg, st->codec->extradata,
488
                                         st->codec->extradata_size);
489
                st->codec->channels = cfg.channels;
490
                if (cfg.ext_sample_rate)
491
                    st->codec->sample_rate = cfg.ext_sample_rate;
492
                else
493
                    st->codec->sample_rate = cfg.sample_rate;
494
                av_dlog(s, "mp4a config channels %d sample rate %d\n",
495
                        st->codec->channels, st->codec->sample_rate);
496
            }
497

    
498
            ret = AVERROR(EAGAIN);
499
            goto leave;
500
        }
501
    }
502

    
503
    /* skip empty data packets */
504
    if (!size) {
505
        ret = AVERROR(EAGAIN);
506
        goto leave;
507
    }
508

    
509
    ret= av_get_packet(s->pb, pkt, size);
510
    if (ret < 0) {
511
        return AVERROR(EIO);
512
    }
513
    /* note: we need to modify the packet size here to handle the last
514
       packet */
515
    pkt->size = ret;
516
    pkt->dts = dts;
517
    pkt->pts = pts == AV_NOPTS_VALUE ? dts : pts;
518
    pkt->stream_index = st->index;
519

    
520
    if (is_audio || ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY))
521
        pkt->flags |= AV_PKT_FLAG_KEY;
522

    
523
leave:
524
    avio_skip(s->pb, 4);
525
    return ret;
526
}
527

    
528
static int flv_read_seek(AVFormatContext *s, int stream_index,
529
    int64_t ts, int flags)
530
{
531
    return ffio_read_seek(s->pb, stream_index, ts, flags);
532
}
533

    
534
#if 0 /* don't know enough to implement this */
535
static int flv_read_seek2(AVFormatContext *s, int stream_index,
536
    int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
537
{
538
    int ret = AVERROR(ENOSYS);
539

540
    if (ts - min_ts > (uint64_t)(max_ts - ts)) flags |= AVSEEK_FLAG_BACKWARD;
541

542
    if (!s->pb->seekable) {
543
        if (stream_index < 0) {
544
            stream_index = av_find_default_stream_index(s);
545
            if (stream_index < 0)
546
                return -1;
547

548
            /* timestamp for default must be expressed in AV_TIME_BASE units */
549
            ts = av_rescale_rnd(ts, 1000, AV_TIME_BASE,
550
                flags & AVSEEK_FLAG_BACKWARD ? AV_ROUND_DOWN : AV_ROUND_UP);
551
        }
552
        ret = ffio_read_seek(s->pb, stream_index, ts, flags);
553
    }
554

555
    if (ret == AVERROR(ENOSYS))
556
        ret = av_seek_frame(s, stream_index, ts, flags);
557
    return ret;
558
}
559
#endif
560

    
561
AVInputFormat ff_flv_demuxer = {
562
    "flv",
563
    NULL_IF_CONFIG_SMALL("FLV format"),
564
    sizeof(FLVContext),
565
    flv_probe,
566
    flv_read_header,
567
    flv_read_packet,
568
    .read_seek = flv_read_seek,
569
#if 0
570
    .read_seek2 = flv_read_seek2,
571
#endif
572
    .extensions = "flv",
573
    .value = CODEC_ID_FLV1,
574
};