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ffmpeg / libavformat / flvdec.c @ 24c3da16

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1 d4f5d74a Garrick Meeker
/*
2 7fbde343 Aurelien Jacobs
 * FLV demuxer
3 d4f5d74a Garrick Meeker
 * Copyright (c) 2003 The FFmpeg Project.
4
 *
5 7b94177e Diego Biurrun
 * 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 b78e7197 Diego Biurrun
 * This file is part of FFmpeg.
11
 *
12
 * FFmpeg is free software; you can redistribute it and/or
13 d4f5d74a Garrick Meeker
 * modify it under the terms of the GNU Lesser General Public
14
 * License as published by the Free Software Foundation; either
15 b78e7197 Diego Biurrun
 * version 2.1 of the License, or (at your option) any later version.
16 d4f5d74a Garrick Meeker
 *
17 b78e7197 Diego Biurrun
 * FFmpeg is distributed in the hope that it will be useful,
18 d4f5d74a Garrick Meeker
 * 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 b78e7197 Diego Biurrun
 * License along with FFmpeg; if not, write to the Free Software
24 5509bffa Diego Biurrun
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 d4f5d74a Garrick Meeker
 */
26
#include "avformat.h"
27 6cac3a3b Allan Hsu
#include "flv.h"
28 d4f5d74a Garrick Meeker
29
static int flv_probe(AVProbeData *p)
30
{
31
    const uint8_t *d;
32
33
    d = p->buf;
34 74248229 Michael Niedermayer
    if (d[0] == 'F' && d[1] == 'L' && d[2] == 'V' && d[3] < 5 && d[5]==0) {
35
        return AVPROBE_SCORE_MAX;
36 d4f5d74a Garrick Meeker
    }
37
    return 0;
38
}
39
40 428cc588 Allan Hsu
static void flv_set_audio_codec(AVFormatContext *s, AVStream *astream, int flv_codecid) {
41
    AVCodecContext *acodec = astream->codec;
42
    switch(flv_codecid) {
43
        //no distinction between S16 and S8 PCM codec flags
44 44de39f9 Michael Niedermayer
        case FLV_CODECID_PCM:
45 58293e57 Michael Niedermayer
            acodec->codec_id = acodec->bits_per_sample == 8 ? CODEC_ID_PCM_S8 :
46
#ifdef WORDS_BIGENDIAN
47
                                CODEC_ID_PCM_S16BE;
48
#else
49
                                CODEC_ID_PCM_S16LE;
50
#endif
51
            break;
52 428cc588 Allan Hsu
        case FLV_CODECID_PCM_LE:
53
            acodec->codec_id = acodec->bits_per_sample == 8 ? CODEC_ID_PCM_S8 : CODEC_ID_PCM_S16LE; break;
54 04fd3e81 Baptiste Coudurier
        case FLV_CODECID_AAC  : acodec->codec_id = CODEC_ID_AAC;                                    break;
55 428cc588 Allan Hsu
        case FLV_CODECID_ADPCM: acodec->codec_id = CODEC_ID_ADPCM_SWF;                              break;
56 77b04435 Baptiste Coudurier
        case FLV_CODECID_SPEEX: acodec->codec_id = CODEC_ID_SPEEX;                                  break;
57 57004ff1 Aurelien Jacobs
        case FLV_CODECID_MP3  : acodec->codec_id = CODEC_ID_MP3      ; astream->need_parsing = AVSTREAM_PARSE_FULL; break;
58 428cc588 Allan Hsu
        case FLV_CODECID_NELLYMOSER_8HZ_MONO:
59
            acodec->sample_rate = 8000; //in case metadata does not otherwise declare samplerate
60
        case FLV_CODECID_NELLYMOSER:
61 636b13c5 Benjamin Larsson
            acodec->codec_id = CODEC_ID_NELLYMOSER;
62
            break;
63 428cc588 Allan Hsu
        default:
64
            av_log(s, AV_LOG_INFO, "Unsupported audio codec (%x)\n", flv_codecid >> FLV_AUDIO_CODECID_OFFSET);
65
            acodec->codec_tag = flv_codecid >> FLV_AUDIO_CODECID_OFFSET;
66
    }
67
}
68
69
static int flv_set_video_codec(AVFormatContext *s, AVStream *vstream, int flv_codecid) {
70
    AVCodecContext *vcodec = vstream->codec;
71
    switch(flv_codecid) {
72
        case FLV_CODECID_H263  : vcodec->codec_id = CODEC_ID_FLV1   ; break;
73
        case FLV_CODECID_SCREEN: vcodec->codec_id = CODEC_ID_FLASHSV; break;
74
        case FLV_CODECID_VP6   : vcodec->codec_id = CODEC_ID_VP6F   ;
75 99904603 Aurelien Jacobs
        case FLV_CODECID_VP6A  :
76
            if(flv_codecid == FLV_CODECID_VP6A)
77
                vcodec->codec_id = CODEC_ID_VP6A;
78 428cc588 Allan Hsu
            if(vcodec->extradata_size != 1) {
79
                vcodec->extradata_size = 1;
80
                vcodec->extradata = av_malloc(1);
81
            }
82 899681cd Björn Axelsson
            vcodec->extradata[0] = get_byte(s->pb);
83 428cc588 Allan Hsu
            return 1; // 1 byte body size adjustment for flv_read_packet()
84 04fd3e81 Baptiste Coudurier
        case FLV_CODECID_H264:
85
            vcodec->codec_id = CODEC_ID_H264;
86
            return 3; // not 4, reading packet type will consume one byte
87 428cc588 Allan Hsu
        default:
88
            av_log(s, AV_LOG_INFO, "Unsupported video codec (%x)\n", flv_codecid);
89
            vcodec->codec_tag = flv_codecid;
90
    }
91
92
    return 0;
93
}
94
95 896bcd2e Michael Niedermayer
static int amf_get_string(ByteIOContext *ioc, char *buffer, int buffsize) {
96 759dd138 Michael Niedermayer
    int length = get_be16(ioc);
97 896bcd2e Michael Niedermayer
    if(length >= buffsize) {
98
        url_fskip(ioc, length);
99 759dd138 Michael Niedermayer
        return -1;
100 896bcd2e Michael Niedermayer
    }
101
102
    get_buffer(ioc, buffer, length);
103
104
    buffer[length] = '\0';
105
106
    return length;
107
}
108
109 428cc588 Allan Hsu
static int amf_parse_object(AVFormatContext *s, AVStream *astream, AVStream *vstream, const char *key, unsigned int max_pos, int depth) {
110
    AVCodecContext *acodec, *vcodec;
111
    ByteIOContext *ioc;
112
    AMFDataType amf_type;
113
    char str_val[256];
114
    double num_val;
115
116
    num_val = 0;
117 899681cd Björn Axelsson
    ioc = s->pb;
118 428cc588 Allan Hsu
119
    amf_type = get_byte(ioc);
120
121
    switch(amf_type) {
122
        case AMF_DATA_TYPE_NUMBER:
123
            num_val = av_int2dbl(get_be64(ioc)); break;
124
        case AMF_DATA_TYPE_BOOL:
125
            num_val = get_byte(ioc); break;
126
        case AMF_DATA_TYPE_STRING:
127
            if(amf_get_string(ioc, str_val, sizeof(str_val)) < 0)
128
                return -1;
129
            break;
130
        case AMF_DATA_TYPE_OBJECT: {
131
            unsigned int keylen;
132
133
            while(url_ftell(ioc) < max_pos - 2 && (keylen = get_be16(ioc))) {
134
                url_fskip(ioc, keylen); //skip key string
135
                if(amf_parse_object(s, NULL, NULL, NULL, max_pos, depth + 1) < 0)
136
                    return -1; //if we couldn't skip, bomb out.
137
            }
138
            if(get_byte(ioc) != AMF_END_OF_OBJECT)
139
                return -1;
140
        }
141
            break;
142
        case AMF_DATA_TYPE_NULL:
143
        case AMF_DATA_TYPE_UNDEFINED:
144
        case AMF_DATA_TYPE_UNSUPPORTED:
145
            break; //these take up no additional space
146
        case AMF_DATA_TYPE_MIXEDARRAY:
147
            url_fskip(ioc, 4); //skip 32-bit max array index
148
            while(url_ftell(ioc) < max_pos - 2 && amf_get_string(ioc, str_val, sizeof(str_val)) > 0) {
149
                //this is the only case in which we would want a nested parse to not skip over the object
150
                if(amf_parse_object(s, astream, vstream, str_val, max_pos, depth + 1) < 0)
151
                    return -1;
152
            }
153
            if(get_byte(ioc) != AMF_END_OF_OBJECT)
154
                return -1;
155
            break;
156
        case AMF_DATA_TYPE_ARRAY: {
157
            unsigned int arraylen, i;
158
159
            arraylen = get_be32(ioc);
160
            for(i = 0; i < arraylen && url_ftell(ioc) < max_pos - 1; i++) {
161
                if(amf_parse_object(s, NULL, NULL, NULL, max_pos, depth + 1) < 0)
162
                    return -1; //if we couldn't skip, bomb out.
163
            }
164
        }
165
            break;
166
        case AMF_DATA_TYPE_DATE:
167
            url_fskip(ioc, 8 + 2); //timestamp (double) and UTC offset (int16)
168
            break;
169
        default: //unsupported type, we couldn't skip
170
            return -1;
171
    }
172
173
    if(depth == 1 && key) { //only look for metadata values when we are not nested and key != NULL
174
        acodec = astream ? astream->codec : NULL;
175
        vcodec = vstream ? vstream->codec : NULL;
176
177
        if(amf_type == AMF_DATA_TYPE_BOOL) {
178
            if(!strcmp(key, "stereo") && acodec) acodec->channels = num_val > 0 ? 2 : 1;
179
        } else if(amf_type == AMF_DATA_TYPE_NUMBER) {
180
            if(!strcmp(key, "duration")) s->duration = num_val * AV_TIME_BASE;
181 683ab79c Michael Niedermayer
//            else if(!strcmp(key, "width")  && vcodec && num_val > 0) vcodec->width  = num_val;
182
//            else if(!strcmp(key, "height") && vcodec && num_val > 0) vcodec->height = num_val;
183 c04c52d3 Pascal Massimino
            else if(!strcmp(key, "audiocodecid") && acodec && 0 <= (int)num_val)
184
                flv_set_audio_codec(s, astream, (int)num_val << FLV_AUDIO_CODECID_OFFSET);
185
            else if(!strcmp(key, "videocodecid") && vcodec && 0 <= (int)num_val)
186
                flv_set_video_codec(s, vstream, (int)num_val);
187
            else if(!strcmp(key, "audiosamplesize") && acodec && 0 < (int)num_val) {
188 428cc588 Allan Hsu
                acodec->bits_per_sample = num_val;
189
                //we may have to rewrite a previously read codecid because FLV only marks PCM endianness.
190
                if(num_val == 8 && (acodec->codec_id == CODEC_ID_PCM_S16BE || acodec->codec_id == CODEC_ID_PCM_S16LE))
191
                    acodec->codec_id = CODEC_ID_PCM_S8;
192
            }
193
            else if(!strcmp(key, "audiosamplerate") && acodec && num_val >= 0) {
194
                //some tools, like FLVTool2, write consistently approximate metadata sample rates
195 7b76c224 Benjamin Larsson
                if (!acodec->sample_rate) {
196 107b5f93 Benjamin Larsson
                    switch((int)num_val) {
197
                        case 44000: acodec->sample_rate = 44100  ; break;
198
                        case 22000: acodec->sample_rate = 22050  ; break;
199
                        case 11000: acodec->sample_rate = 11025  ; break;
200
                        case 5000 : acodec->sample_rate = 5512   ; break;
201
                        default   : acodec->sample_rate = num_val;
202
                    }
203 7b76c224 Benjamin Larsson
                }
204 428cc588 Allan Hsu
            }
205
        }
206
    }
207
208
    return 0;
209
}
210
211
static int flv_read_metabody(AVFormatContext *s, unsigned int next_pos) {
212
    AMFDataType type;
213
    AVStream *stream, *astream, *vstream;
214
    ByteIOContext *ioc;
215
    int i, keylen;
216
    char buffer[11]; //only needs to hold the string "onMetaData". Anything longer is something we don't want.
217
218
    astream = NULL;
219
    vstream = NULL;
220
    keylen = 0;
221 899681cd Björn Axelsson
    ioc = s->pb;
222 428cc588 Allan Hsu
223
    //first object needs to be "onMetaData" string
224
    type = get_byte(ioc);
225
    if(type != AMF_DATA_TYPE_STRING || amf_get_string(ioc, buffer, sizeof(buffer)) < 0 || strcmp(buffer, "onMetaData"))
226
        return -1;
227
228
    //find the streams now so that amf_parse_object doesn't need to do the lookup every time it is called.
229
    for(i = 0; i < s->nb_streams; i++) {
230
        stream = s->streams[i];
231
        if     (stream->codec->codec_type == CODEC_TYPE_AUDIO) astream = stream;
232
        else if(stream->codec->codec_type == CODEC_TYPE_VIDEO) vstream = stream;
233
    }
234
235
    //parse the second object (we want a mixed array)
236
    if(amf_parse_object(s, astream, vstream, buffer, next_pos, 0) < 0)
237
        return -1;
238
239
    return 0;
240
}
241
242 6f910bcf Michael Niedermayer
static AVStream *create_stream(AVFormatContext *s, int is_audio){
243
    AVStream *st = av_new_stream(s, is_audio);
244
    if (!st)
245
        return NULL;
246
    st->codec->codec_type = is_audio ? CODEC_TYPE_AUDIO : CODEC_TYPE_VIDEO;
247 19719bc6 Baptiste Coudurier
    av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
248 6f910bcf Michael Niedermayer
    return st;
249
}
250
251 d4f5d74a Garrick Meeker
static int flv_read_header(AVFormatContext *s,
252
                           AVFormatParameters *ap)
253
{
254 15f14fc7 Michael Niedermayer
    int offset, flags;
255 d4f5d74a Garrick Meeker
256 899681cd Björn Axelsson
    url_fskip(s->pb, 4);
257
    flags = get_byte(s->pb);
258 031311cb Alex Beregszaszi
    /* old flvtool cleared this field */
259
    /* FIXME: better fix needed */
260
    if (!flags) {
261
        flags = FLV_HEADER_FLAG_HASVIDEO | FLV_HEADER_FLAG_HASAUDIO;
262
        av_log(s, AV_LOG_WARNING, "Broken FLV file, which says no streams present, this might fail\n");
263
    }
264 d4f5d74a Garrick Meeker
265 b41497e9 Michael Niedermayer
    if((flags & (FLV_HEADER_FLAG_HASVIDEO|FLV_HEADER_FLAG_HASAUDIO))
266
             != (FLV_HEADER_FLAG_HASVIDEO|FLV_HEADER_FLAG_HASAUDIO))
267
        s->ctx_flags |= AVFMTCTX_NOHEADER;
268
269 4eb0c665 Michael Niedermayer
    if(flags & FLV_HEADER_FLAG_HASVIDEO){
270 6f910bcf Michael Niedermayer
        if(!create_stream(s, 0))
271 769e10f0 Panagiotis Issaris
            return AVERROR(ENOMEM);
272 4eb0c665 Michael Niedermayer
    }
273
    if(flags & FLV_HEADER_FLAG_HASAUDIO){
274 6f910bcf Michael Niedermayer
        if(!create_stream(s, 1))
275 769e10f0 Panagiotis Issaris
            return AVERROR(ENOMEM);
276 4eb0c665 Michael Niedermayer
    }
277
278 899681cd Björn Axelsson
    offset = get_be32(s->pb);
279
    url_fseek(s->pb, offset, SEEK_SET);
280 d4f5d74a Garrick Meeker
281 aeb20f7f Nazo
    s->start_time = 0;
282
283 d4f5d74a Garrick Meeker
    return 0;
284
}
285
286 04fd3e81 Baptiste Coudurier
static int flv_get_extradata(AVFormatContext *s, AVStream *st, int size)
287
{
288
    av_free(st->codec->extradata);
289
    st->codec->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);
290
    if (!st->codec->extradata)
291
        return AVERROR(ENOMEM);
292
    st->codec->extradata_size = size;
293
    get_buffer(s->pb, st->codec->extradata, st->codec->extradata_size);
294
    return 0;
295
}
296
297 d4f5d74a Garrick Meeker
static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
298
{
299 07a47ae2 Baptiste Coudurier
    int ret, i, type, size, flags, is_audio, next, pos;
300 7ef94d22 Baptiste Coudurier
    unsigned dts;
301 923bd441 Alex Beregszaszi
    AVStream *st = NULL;
302 115329f1 Diego Biurrun
303 04fd3e81 Baptiste Coudurier
 retry:
304 068f2a22 Michael Niedermayer
 for(;;){
305 899681cd Björn Axelsson
    pos = url_ftell(s->pb);
306
    url_fskip(s->pb, 4); /* size of previous packet */
307
    type = get_byte(s->pb);
308
    size = get_be24(s->pb);
309 7ef94d22 Baptiste Coudurier
    dts = get_be24(s->pb);
310
    dts |= get_byte(s->pb) << 24;
311
//    av_log(s, AV_LOG_DEBUG, "type:%d, size:%d, dts:%d\n", type, size, dts);
312 899681cd Björn Axelsson
    if (url_feof(s->pb))
313 6f3e0b21 Panagiotis Issaris
        return AVERROR(EIO);
314 899681cd Björn Axelsson
    url_fskip(s->pb, 3); /* stream id, always 0 */
315 d4f5d74a Garrick Meeker
    flags = 0;
316 115329f1 Diego Biurrun
317 068f2a22 Michael Niedermayer
    if(size == 0)
318
        continue;
319 115329f1 Diego Biurrun
320 899681cd Björn Axelsson
    next= size + url_ftell(s->pb);
321 dd9f5916 Michael Niedermayer
322 6cac3a3b Allan Hsu
    if (type == FLV_TAG_TYPE_AUDIO) {
323 068f2a22 Michael Niedermayer
        is_audio=1;
324 899681cd Björn Axelsson
        flags = get_byte(s->pb);
325 6298eb81 Baptiste Coudurier
        size--;
326 6cac3a3b Allan Hsu
    } else if (type == FLV_TAG_TYPE_VIDEO) {
327 068f2a22 Michael Niedermayer
        is_audio=0;
328 899681cd Björn Axelsson
        flags = get_byte(s->pb);
329 6298eb81 Baptiste Coudurier
        size--;
330 3d9aecb0 Baptiste Coudurier
        if ((flags & 0xf0) == 0x50) /* video info / command frame */
331
            goto skip;
332 d4f5d74a Garrick Meeker
    } else {
333 428cc588 Allan Hsu
        if (type == FLV_TAG_TYPE_META && size > 13+1+4)
334
            flv_read_metabody(s, next);
335
        else /* skip packet */
336
            av_log(s, AV_LOG_ERROR, "skipping flv packet: type %d, size %d, flags %d\n", type, size, flags);
337 3d9aecb0 Baptiste Coudurier
    skip:
338 899681cd Björn Axelsson
        url_fseek(s->pb, next, SEEK_SET);
339 068f2a22 Michael Niedermayer
        continue;
340 d4f5d74a Garrick Meeker
    }
341
342 ae58b54b Baptiste Coudurier
    /* skip empty data packets */
343
    if (!size)
344
        continue;
345
346 d4f5d74a Garrick Meeker
    /* now find stream */
347
    for(i=0;i<s->nb_streams;i++) {
348
        st = s->streams[i];
349 068f2a22 Michael Niedermayer
        if (st->id == is_audio)
350
            break;
351 d4f5d74a Garrick Meeker
    }
352 068f2a22 Michael Niedermayer
    if(i == s->nb_streams){
353 4eb0c665 Michael Niedermayer
        av_log(NULL, AV_LOG_ERROR, "invalid stream\n");
354 c8652b57 Michael Niedermayer
        st= create_stream(s, is_audio);
355 a33cfa30 Michael Niedermayer
        s->ctx_flags &= ~AVFMTCTX_NOHEADER;
356 6ed08157 Michael Niedermayer
    }
357 f3356e9c Michael Niedermayer
//    av_log(NULL, AV_LOG_DEBUG, "%d %X %d \n", is_audio, flags, st->discard);
358 6cac3a3b Allan Hsu
    if(  (st->discard >= AVDISCARD_NONKEY && !((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY ||         is_audio))
359
       ||(st->discard >= AVDISCARD_BIDIR  &&  ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_DISP_INTER && !is_audio))
360 f3356e9c Michael Niedermayer
       || st->discard >= AVDISCARD_ALL
361
       ){
362 899681cd Björn Axelsson
        url_fseek(s->pb, next, SEEK_SET);
363 b9866ebc Michael Niedermayer
        continue;
364
    }
365 6cac3a3b Allan Hsu
    if ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY)
366 7ef94d22 Baptiste Coudurier
        av_add_index_entry(st, pos, dts, size, 0, AVINDEX_KEYFRAME);
367 068f2a22 Michael Niedermayer
    break;
368
 }
369
370 15f14fc7 Michael Niedermayer
    // if not streamed and no duration from metadata then seek to end to find the duration from the timestamps
371 899681cd Björn Axelsson
    if(!url_is_streamed(s->pb) && s->duration==AV_NOPTS_VALUE){
372 15f14fc7 Michael Niedermayer
        int size;
373 899681cd Björn Axelsson
        const int pos= url_ftell(s->pb);
374
        const int fsize= url_fsize(s->pb);
375
        url_fseek(s->pb, fsize-4, SEEK_SET);
376
        size= get_be32(s->pb);
377
        url_fseek(s->pb, fsize-3-size, SEEK_SET);
378
        if(size == get_be24(s->pb) + 11){
379
            s->duration= get_be24(s->pb) * (int64_t)AV_TIME_BASE / 1000;
380 15f14fc7 Michael Niedermayer
        }
381 899681cd Björn Axelsson
        url_fseek(s->pb, pos, SEEK_SET);
382 15f14fc7 Michael Niedermayer
    }
383
384 068f2a22 Michael Niedermayer
    if(is_audio){
385 428cc588 Allan Hsu
        if(!st->codec->sample_rate || !st->codec->bits_per_sample || (!st->codec->codec_id && !st->codec->codec_tag)) {
386 6cac3a3b Allan Hsu
            st->codec->channels = (flags & FLV_AUDIO_CHANNEL_MASK) == FLV_STEREO ? 2 : 1;
387
            if((flags & FLV_AUDIO_CODECID_MASK) == FLV_CODECID_NELLYMOSER_8HZ_MONO)
388 01f4895c Michael Niedermayer
                st->codec->sample_rate= 8000;
389 068f2a22 Michael Niedermayer
            else
390 6cac3a3b Allan Hsu
                st->codec->sample_rate = (44100 << ((flags & FLV_AUDIO_SAMPLERATE_MASK) >> FLV_AUDIO_SAMPLERATE_OFFSET) >> 3);
391
            st->codec->bits_per_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;
392 428cc588 Allan Hsu
            flv_set_audio_codec(s, st, flags & FLV_AUDIO_CODECID_MASK);
393 068f2a22 Michael Niedermayer
        }
394
    }else{
395 428cc588 Allan Hsu
        size -= flv_set_video_codec(s, st, flags & FLV_VIDEO_CODECID_MASK);
396 bb01a3f0 Michael Niedermayer
    }
397
398 04fd3e81 Baptiste Coudurier
    if (st->codec->codec_id == CODEC_ID_AAC ||
399
        st->codec->codec_id == CODEC_ID_H264) {
400
        int type = get_byte(s->pb);
401
        size--;
402
        if (st->codec->codec_id == CODEC_ID_H264) {
403
            // cts offset ignored because it might to be signed
404
            // and would cause pts < dts
405
            get_be24(s->pb);
406
        }
407
        if (type == 0) {
408 6298eb81 Baptiste Coudurier
            if ((ret = flv_get_extradata(s, st, size)) < 0)
409 04fd3e81 Baptiste Coudurier
                return ret;
410
            goto retry;
411
        }
412
    }
413
414 6298eb81 Baptiste Coudurier
    ret= av_get_packet(s->pb, pkt, size);
415 d4f5d74a Garrick Meeker
    if (ret <= 0) {
416 6f3e0b21 Panagiotis Issaris
        return AVERROR(EIO);
417 d4f5d74a Garrick Meeker
    }
418
    /* note: we need to modify the packet size here to handle the last
419
       packet */
420
    pkt->size = ret;
421 7ef94d22 Baptiste Coudurier
    pkt->dts = dts;
422 d4f5d74a Garrick Meeker
    pkt->stream_index = st->index;
423 115329f1 Diego Biurrun
424 6cac3a3b Allan Hsu
    if (is_audio || ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY))
425 bb270c08 Diego Biurrun
        pkt->flags |= PKT_FLAG_KEY;
426 115329f1 Diego Biurrun
427 d4f5d74a Garrick Meeker
    return ret;
428
}
429
430 d2a067d1 Måns Rullgård
AVInputFormat flv_demuxer = {
431 d4f5d74a Garrick Meeker
    "flv",
432 bde15e74 Stefano Sabatini
    NULL_IF_CONFIG_SMALL("FLV format"),
433 df63f130 Aurelien Jacobs
    0,
434 d4f5d74a Garrick Meeker
    flv_probe,
435
    flv_read_header,
436
    flv_read_packet,
437
    .extensions = "flv",
438
    .value = CODEC_ID_FLV1,
439
};