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ffmpeg / libavformat / flvdec.c @ 470bce2b

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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 ebd61055 Baptiste Coudurier
typedef struct {
30
    int wrong_dts; ///< wrong dts due to negative cts
31
} FLVContext;
32
33 d4f5d74a Garrick Meeker
static int flv_probe(AVProbeData *p)
34
{
35
    const uint8_t *d;
36
37
    d = p->buf;
38 74248229 Michael Niedermayer
    if (d[0] == 'F' && d[1] == 'L' && d[2] == 'V' && d[3] < 5 && d[5]==0) {
39
        return AVPROBE_SCORE_MAX;
40 d4f5d74a Garrick Meeker
    }
41
    return 0;
42
}
43
44 428cc588 Allan Hsu
static void flv_set_audio_codec(AVFormatContext *s, AVStream *astream, int flv_codecid) {
45
    AVCodecContext *acodec = astream->codec;
46
    switch(flv_codecid) {
47
        //no distinction between S16 and S8 PCM codec flags
48 44de39f9 Michael Niedermayer
        case FLV_CODECID_PCM:
49 dd1c8f3e Luca Abeni
            acodec->codec_id = acodec->bits_per_coded_sample == 8 ? CODEC_ID_PCM_S8 :
50 58293e57 Michael Niedermayer
#ifdef WORDS_BIGENDIAN
51
                                CODEC_ID_PCM_S16BE;
52
#else
53
                                CODEC_ID_PCM_S16LE;
54
#endif
55
            break;
56 428cc588 Allan Hsu
        case FLV_CODECID_PCM_LE:
57 dd1c8f3e Luca Abeni
            acodec->codec_id = acodec->bits_per_coded_sample == 8 ? CODEC_ID_PCM_S8 : CODEC_ID_PCM_S16LE; break;
58 04fd3e81 Baptiste Coudurier
        case FLV_CODECID_AAC  : acodec->codec_id = CODEC_ID_AAC;                                    break;
59 428cc588 Allan Hsu
        case FLV_CODECID_ADPCM: acodec->codec_id = CODEC_ID_ADPCM_SWF;                              break;
60 f96d0eef Baptiste Coudurier
        case FLV_CODECID_SPEEX:
61
            acodec->codec_id = CODEC_ID_SPEEX;
62
            acodec->sample_rate = 16000;
63
            break;
64 57004ff1 Aurelien Jacobs
        case FLV_CODECID_MP3  : acodec->codec_id = CODEC_ID_MP3      ; astream->need_parsing = AVSTREAM_PARSE_FULL; break;
65 88cb61bb Alexander Wichers
        case FLV_CODECID_NELLYMOSER_8KHZ_MONO:
66 428cc588 Allan Hsu
            acodec->sample_rate = 8000; //in case metadata does not otherwise declare samplerate
67
        case FLV_CODECID_NELLYMOSER:
68 636b13c5 Benjamin Larsson
            acodec->codec_id = CODEC_ID_NELLYMOSER;
69
            break;
70 428cc588 Allan Hsu
        default:
71
            av_log(s, AV_LOG_INFO, "Unsupported audio codec (%x)\n", flv_codecid >> FLV_AUDIO_CODECID_OFFSET);
72
            acodec->codec_tag = flv_codecid >> FLV_AUDIO_CODECID_OFFSET;
73
    }
74
}
75
76
static int flv_set_video_codec(AVFormatContext *s, AVStream *vstream, int flv_codecid) {
77
    AVCodecContext *vcodec = vstream->codec;
78
    switch(flv_codecid) {
79
        case FLV_CODECID_H263  : vcodec->codec_id = CODEC_ID_FLV1   ; break;
80
        case FLV_CODECID_SCREEN: vcodec->codec_id = CODEC_ID_FLASHSV; break;
81
        case FLV_CODECID_VP6   : vcodec->codec_id = CODEC_ID_VP6F   ;
82 99904603 Aurelien Jacobs
        case FLV_CODECID_VP6A  :
83
            if(flv_codecid == FLV_CODECID_VP6A)
84
                vcodec->codec_id = CODEC_ID_VP6A;
85 428cc588 Allan Hsu
            if(vcodec->extradata_size != 1) {
86
                vcodec->extradata_size = 1;
87
                vcodec->extradata = av_malloc(1);
88
            }
89 899681cd Björn Axelsson
            vcodec->extradata[0] = get_byte(s->pb);
90 428cc588 Allan Hsu
            return 1; // 1 byte body size adjustment for flv_read_packet()
91 04fd3e81 Baptiste Coudurier
        case FLV_CODECID_H264:
92
            vcodec->codec_id = CODEC_ID_H264;
93
            return 3; // not 4, reading packet type will consume one byte
94 428cc588 Allan Hsu
        default:
95
            av_log(s, AV_LOG_INFO, "Unsupported video codec (%x)\n", flv_codecid);
96
            vcodec->codec_tag = flv_codecid;
97
    }
98
99
    return 0;
100
}
101
102 896bcd2e Michael Niedermayer
static int amf_get_string(ByteIOContext *ioc, char *buffer, int buffsize) {
103 759dd138 Michael Niedermayer
    int length = get_be16(ioc);
104 896bcd2e Michael Niedermayer
    if(length >= buffsize) {
105
        url_fskip(ioc, length);
106 759dd138 Michael Niedermayer
        return -1;
107 896bcd2e Michael Niedermayer
    }
108
109
    get_buffer(ioc, buffer, length);
110
111
    buffer[length] = '\0';
112
113
    return length;
114
}
115
116 4fe8a452 Pascal Massimino
static int amf_parse_object(AVFormatContext *s, AVStream *astream, AVStream *vstream, const char *key, int64_t max_pos, int depth) {
117 428cc588 Allan Hsu
    AVCodecContext *acodec, *vcodec;
118
    ByteIOContext *ioc;
119
    AMFDataType amf_type;
120
    char str_val[256];
121
    double num_val;
122
123
    num_val = 0;
124 899681cd Björn Axelsson
    ioc = s->pb;
125 428cc588 Allan Hsu
126
    amf_type = get_byte(ioc);
127
128
    switch(amf_type) {
129
        case AMF_DATA_TYPE_NUMBER:
130
            num_val = av_int2dbl(get_be64(ioc)); break;
131
        case AMF_DATA_TYPE_BOOL:
132
            num_val = get_byte(ioc); break;
133
        case AMF_DATA_TYPE_STRING:
134
            if(amf_get_string(ioc, str_val, sizeof(str_val)) < 0)
135
                return -1;
136
            break;
137
        case AMF_DATA_TYPE_OBJECT: {
138
            unsigned int keylen;
139
140
            while(url_ftell(ioc) < max_pos - 2 && (keylen = get_be16(ioc))) {
141
                url_fskip(ioc, keylen); //skip key string
142
                if(amf_parse_object(s, NULL, NULL, NULL, max_pos, depth + 1) < 0)
143
                    return -1; //if we couldn't skip, bomb out.
144
            }
145
            if(get_byte(ioc) != AMF_END_OF_OBJECT)
146
                return -1;
147
        }
148
            break;
149
        case AMF_DATA_TYPE_NULL:
150
        case AMF_DATA_TYPE_UNDEFINED:
151
        case AMF_DATA_TYPE_UNSUPPORTED:
152
            break; //these take up no additional space
153
        case AMF_DATA_TYPE_MIXEDARRAY:
154
            url_fskip(ioc, 4); //skip 32-bit max array index
155
            while(url_ftell(ioc) < max_pos - 2 && amf_get_string(ioc, str_val, sizeof(str_val)) > 0) {
156
                //this is the only case in which we would want a nested parse to not skip over the object
157
                if(amf_parse_object(s, astream, vstream, str_val, max_pos, depth + 1) < 0)
158
                    return -1;
159
            }
160
            if(get_byte(ioc) != AMF_END_OF_OBJECT)
161
                return -1;
162
            break;
163
        case AMF_DATA_TYPE_ARRAY: {
164
            unsigned int arraylen, i;
165
166
            arraylen = get_be32(ioc);
167
            for(i = 0; i < arraylen && url_ftell(ioc) < max_pos - 1; i++) {
168
                if(amf_parse_object(s, NULL, NULL, NULL, max_pos, depth + 1) < 0)
169
                    return -1; //if we couldn't skip, bomb out.
170
            }
171
        }
172
            break;
173
        case AMF_DATA_TYPE_DATE:
174
            url_fskip(ioc, 8 + 2); //timestamp (double) and UTC offset (int16)
175
            break;
176
        default: //unsupported type, we couldn't skip
177
            return -1;
178
    }
179
180
    if(depth == 1 && key) { //only look for metadata values when we are not nested and key != NULL
181
        acodec = astream ? astream->codec : NULL;
182
        vcodec = vstream ? vstream->codec : NULL;
183
184
        if(amf_type == AMF_DATA_TYPE_BOOL) {
185
            if(!strcmp(key, "stereo") && acodec) acodec->channels = num_val > 0 ? 2 : 1;
186
        } else if(amf_type == AMF_DATA_TYPE_NUMBER) {
187
            if(!strcmp(key, "duration")) s->duration = num_val * AV_TIME_BASE;
188 683ab79c Michael Niedermayer
//            else if(!strcmp(key, "width")  && vcodec && num_val > 0) vcodec->width  = num_val;
189
//            else if(!strcmp(key, "height") && vcodec && num_val > 0) vcodec->height = num_val;
190 c04c52d3 Pascal Massimino
            else if(!strcmp(key, "audiocodecid") && acodec && 0 <= (int)num_val)
191
                flv_set_audio_codec(s, astream, (int)num_val << FLV_AUDIO_CODECID_OFFSET);
192
            else if(!strcmp(key, "videocodecid") && vcodec && 0 <= (int)num_val)
193
                flv_set_video_codec(s, vstream, (int)num_val);
194
            else if(!strcmp(key, "audiosamplesize") && acodec && 0 < (int)num_val) {
195 dd1c8f3e Luca Abeni
                acodec->bits_per_coded_sample = num_val;
196 428cc588 Allan Hsu
                //we may have to rewrite a previously read codecid because FLV only marks PCM endianness.
197
                if(num_val == 8 && (acodec->codec_id == CODEC_ID_PCM_S16BE || acodec->codec_id == CODEC_ID_PCM_S16LE))
198
                    acodec->codec_id = CODEC_ID_PCM_S8;
199
            }
200
            else if(!strcmp(key, "audiosamplerate") && acodec && num_val >= 0) {
201
                //some tools, like FLVTool2, write consistently approximate metadata sample rates
202 7b76c224 Benjamin Larsson
                if (!acodec->sample_rate) {
203 107b5f93 Benjamin Larsson
                    switch((int)num_val) {
204
                        case 44000: acodec->sample_rate = 44100  ; break;
205
                        case 22000: acodec->sample_rate = 22050  ; break;
206
                        case 11000: acodec->sample_rate = 11025  ; break;
207
                        case 5000 : acodec->sample_rate = 5512   ; break;
208
                        default   : acodec->sample_rate = num_val;
209
                    }
210 7b76c224 Benjamin Larsson
                }
211 428cc588 Allan Hsu
            }
212
        }
213
    }
214
215
    return 0;
216
}
217
218 4fe8a452 Pascal Massimino
static int flv_read_metabody(AVFormatContext *s, int64_t next_pos) {
219 428cc588 Allan Hsu
    AMFDataType type;
220
    AVStream *stream, *astream, *vstream;
221
    ByteIOContext *ioc;
222
    int i, keylen;
223
    char buffer[11]; //only needs to hold the string "onMetaData". Anything longer is something we don't want.
224
225
    astream = NULL;
226
    vstream = NULL;
227
    keylen = 0;
228 899681cd Björn Axelsson
    ioc = s->pb;
229 428cc588 Allan Hsu
230
    //first object needs to be "onMetaData" string
231
    type = get_byte(ioc);
232
    if(type != AMF_DATA_TYPE_STRING || amf_get_string(ioc, buffer, sizeof(buffer)) < 0 || strcmp(buffer, "onMetaData"))
233
        return -1;
234
235
    //find the streams now so that amf_parse_object doesn't need to do the lookup every time it is called.
236
    for(i = 0; i < s->nb_streams; i++) {
237
        stream = s->streams[i];
238
        if     (stream->codec->codec_type == CODEC_TYPE_AUDIO) astream = stream;
239
        else if(stream->codec->codec_type == CODEC_TYPE_VIDEO) vstream = stream;
240
    }
241
242
    //parse the second object (we want a mixed array)
243
    if(amf_parse_object(s, astream, vstream, buffer, next_pos, 0) < 0)
244
        return -1;
245
246
    return 0;
247
}
248
249 6f910bcf Michael Niedermayer
static AVStream *create_stream(AVFormatContext *s, int is_audio){
250
    AVStream *st = av_new_stream(s, is_audio);
251
    if (!st)
252
        return NULL;
253
    st->codec->codec_type = is_audio ? CODEC_TYPE_AUDIO : CODEC_TYPE_VIDEO;
254 19719bc6 Baptiste Coudurier
    av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
255 6f910bcf Michael Niedermayer
    return st;
256
}
257
258 d4f5d74a Garrick Meeker
static int flv_read_header(AVFormatContext *s,
259
                           AVFormatParameters *ap)
260
{
261 15f14fc7 Michael Niedermayer
    int offset, flags;
262 d4f5d74a Garrick Meeker
263 899681cd Björn Axelsson
    url_fskip(s->pb, 4);
264
    flags = get_byte(s->pb);
265 031311cb Alex Beregszaszi
    /* old flvtool cleared this field */
266
    /* FIXME: better fix needed */
267
    if (!flags) {
268
        flags = FLV_HEADER_FLAG_HASVIDEO | FLV_HEADER_FLAG_HASAUDIO;
269
        av_log(s, AV_LOG_WARNING, "Broken FLV file, which says no streams present, this might fail\n");
270
    }
271 d4f5d74a Garrick Meeker
272 b41497e9 Michael Niedermayer
    if((flags & (FLV_HEADER_FLAG_HASVIDEO|FLV_HEADER_FLAG_HASAUDIO))
273
             != (FLV_HEADER_FLAG_HASVIDEO|FLV_HEADER_FLAG_HASAUDIO))
274
        s->ctx_flags |= AVFMTCTX_NOHEADER;
275
276 4eb0c665 Michael Niedermayer
    if(flags & FLV_HEADER_FLAG_HASVIDEO){
277 6f910bcf Michael Niedermayer
        if(!create_stream(s, 0))
278 769e10f0 Panagiotis Issaris
            return AVERROR(ENOMEM);
279 4eb0c665 Michael Niedermayer
    }
280
    if(flags & FLV_HEADER_FLAG_HASAUDIO){
281 6f910bcf Michael Niedermayer
        if(!create_stream(s, 1))
282 769e10f0 Panagiotis Issaris
            return AVERROR(ENOMEM);
283 4eb0c665 Michael Niedermayer
    }
284
285 899681cd Björn Axelsson
    offset = get_be32(s->pb);
286
    url_fseek(s->pb, offset, SEEK_SET);
287 d4f5d74a Garrick Meeker
288 aeb20f7f Nazo
    s->start_time = 0;
289
290 d4f5d74a Garrick Meeker
    return 0;
291
}
292
293 04fd3e81 Baptiste Coudurier
static int flv_get_extradata(AVFormatContext *s, AVStream *st, int size)
294
{
295
    av_free(st->codec->extradata);
296
    st->codec->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);
297
    if (!st->codec->extradata)
298
        return AVERROR(ENOMEM);
299
    st->codec->extradata_size = size;
300
    get_buffer(s->pb, st->codec->extradata, st->codec->extradata_size);
301
    return 0;
302
}
303
304 d4f5d74a Garrick Meeker
static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
305
{
306 ebd61055 Baptiste Coudurier
    FLVContext *flv = s->priv_data;
307 4fe8a452 Pascal Massimino
    int ret, i, type, size, flags, is_audio;
308
    int64_t next, pos;
309 ebd61055 Baptiste Coudurier
    int64_t dts, pts = AV_NOPTS_VALUE;
310 923bd441 Alex Beregszaszi
    AVStream *st = NULL;
311 115329f1 Diego Biurrun
312 04fd3e81 Baptiste Coudurier
 retry:
313 068f2a22 Michael Niedermayer
 for(;;){
314 899681cd Björn Axelsson
    pos = url_ftell(s->pb);
315
    url_fskip(s->pb, 4); /* size of previous packet */
316
    type = get_byte(s->pb);
317
    size = get_be24(s->pb);
318 7ef94d22 Baptiste Coudurier
    dts = get_be24(s->pb);
319
    dts |= get_byte(s->pb) << 24;
320
//    av_log(s, AV_LOG_DEBUG, "type:%d, size:%d, dts:%d\n", type, size, dts);
321 899681cd Björn Axelsson
    if (url_feof(s->pb))
322 6f3e0b21 Panagiotis Issaris
        return AVERROR(EIO);
323 899681cd Björn Axelsson
    url_fskip(s->pb, 3); /* stream id, always 0 */
324 d4f5d74a Garrick Meeker
    flags = 0;
325 115329f1 Diego Biurrun
326 068f2a22 Michael Niedermayer
    if(size == 0)
327
        continue;
328 115329f1 Diego Biurrun
329 899681cd Björn Axelsson
    next= size + url_ftell(s->pb);
330 dd9f5916 Michael Niedermayer
331 6cac3a3b Allan Hsu
    if (type == FLV_TAG_TYPE_AUDIO) {
332 068f2a22 Michael Niedermayer
        is_audio=1;
333 899681cd Björn Axelsson
        flags = get_byte(s->pb);
334 6298eb81 Baptiste Coudurier
        size--;
335 6cac3a3b Allan Hsu
    } else if (type == FLV_TAG_TYPE_VIDEO) {
336 068f2a22 Michael Niedermayer
        is_audio=0;
337 899681cd Björn Axelsson
        flags = get_byte(s->pb);
338 6298eb81 Baptiste Coudurier
        size--;
339 3d9aecb0 Baptiste Coudurier
        if ((flags & 0xf0) == 0x50) /* video info / command frame */
340
            goto skip;
341 d4f5d74a Garrick Meeker
    } else {
342 428cc588 Allan Hsu
        if (type == FLV_TAG_TYPE_META && size > 13+1+4)
343
            flv_read_metabody(s, next);
344
        else /* skip packet */
345
            av_log(s, AV_LOG_ERROR, "skipping flv packet: type %d, size %d, flags %d\n", type, size, flags);
346 3d9aecb0 Baptiste Coudurier
    skip:
347 899681cd Björn Axelsson
        url_fseek(s->pb, next, SEEK_SET);
348 068f2a22 Michael Niedermayer
        continue;
349 d4f5d74a Garrick Meeker
    }
350
351 ae58b54b Baptiste Coudurier
    /* skip empty data packets */
352
    if (!size)
353
        continue;
354
355 d4f5d74a Garrick Meeker
    /* now find stream */
356
    for(i=0;i<s->nb_streams;i++) {
357
        st = s->streams[i];
358 068f2a22 Michael Niedermayer
        if (st->id == is_audio)
359
            break;
360 d4f5d74a Garrick Meeker
    }
361 068f2a22 Michael Niedermayer
    if(i == s->nb_streams){
362 4eb0c665 Michael Niedermayer
        av_log(NULL, AV_LOG_ERROR, "invalid stream\n");
363 c8652b57 Michael Niedermayer
        st= create_stream(s, is_audio);
364 a33cfa30 Michael Niedermayer
        s->ctx_flags &= ~AVFMTCTX_NOHEADER;
365 6ed08157 Michael Niedermayer
    }
366 f3356e9c Michael Niedermayer
//    av_log(NULL, AV_LOG_DEBUG, "%d %X %d \n", is_audio, flags, st->discard);
367 6cac3a3b Allan Hsu
    if(  (st->discard >= AVDISCARD_NONKEY && !((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY ||         is_audio))
368
       ||(st->discard >= AVDISCARD_BIDIR  &&  ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_DISP_INTER && !is_audio))
369 f3356e9c Michael Niedermayer
       || st->discard >= AVDISCARD_ALL
370
       ){
371 899681cd Björn Axelsson
        url_fseek(s->pb, next, SEEK_SET);
372 b9866ebc Michael Niedermayer
        continue;
373
    }
374 6cac3a3b Allan Hsu
    if ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY)
375 7ef94d22 Baptiste Coudurier
        av_add_index_entry(st, pos, dts, size, 0, AVINDEX_KEYFRAME);
376 068f2a22 Michael Niedermayer
    break;
377
 }
378
379 15f14fc7 Michael Niedermayer
    // if not streamed and no duration from metadata then seek to end to find the duration from the timestamps
380 899681cd Björn Axelsson
    if(!url_is_streamed(s->pb) && s->duration==AV_NOPTS_VALUE){
381 15f14fc7 Michael Niedermayer
        int size;
382 4fe8a452 Pascal Massimino
        const int64_t pos= url_ftell(s->pb);
383
        const int64_t fsize= url_fsize(s->pb);
384 899681cd Björn Axelsson
        url_fseek(s->pb, fsize-4, SEEK_SET);
385
        size= get_be32(s->pb);
386
        url_fseek(s->pb, fsize-3-size, SEEK_SET);
387
        if(size == get_be24(s->pb) + 11){
388
            s->duration= get_be24(s->pb) * (int64_t)AV_TIME_BASE / 1000;
389 15f14fc7 Michael Niedermayer
        }
390 899681cd Björn Axelsson
        url_fseek(s->pb, pos, SEEK_SET);
391 15f14fc7 Michael Niedermayer
    }
392
393 068f2a22 Michael Niedermayer
    if(is_audio){
394 2f3d7ea9 Michael Niedermayer
        if(!st->codec->channels || !st->codec->sample_rate || !st->codec->bits_per_coded_sample) {
395 6cac3a3b Allan Hsu
            st->codec->channels = (flags & FLV_AUDIO_CHANNEL_MASK) == FLV_STEREO ? 2 : 1;
396 7f8cd075 Baptiste Coudurier
            st->codec->sample_rate = (44100 << ((flags & FLV_AUDIO_SAMPLERATE_MASK) >> FLV_AUDIO_SAMPLERATE_OFFSET) >> 3);
397 dd1c8f3e Luca Abeni
            st->codec->bits_per_coded_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;
398 2f3d7ea9 Michael Niedermayer
        }
399
        if(!st->codec->codec_id){
400 428cc588 Allan Hsu
            flv_set_audio_codec(s, st, flags & FLV_AUDIO_CODECID_MASK);
401 068f2a22 Michael Niedermayer
        }
402
    }else{
403 428cc588 Allan Hsu
        size -= flv_set_video_codec(s, st, flags & FLV_VIDEO_CODECID_MASK);
404 bb01a3f0 Michael Niedermayer
    }
405
406 04fd3e81 Baptiste Coudurier
    if (st->codec->codec_id == CODEC_ID_AAC ||
407
        st->codec->codec_id == CODEC_ID_H264) {
408
        int type = get_byte(s->pb);
409
        size--;
410
        if (st->codec->codec_id == CODEC_ID_H264) {
411 ebd61055 Baptiste Coudurier
            int32_t cts = (get_be24(s->pb)+0xff800000)^0xff800000; // sign extension
412
            pts = dts + cts;
413
            if (cts < 0) { // dts are wrong
414
                flv->wrong_dts = 1;
415
                av_log(s, AV_LOG_WARNING, "negative cts, previous timestamps might be wrong\n");
416
            }
417
            if (flv->wrong_dts)
418
                dts = AV_NOPTS_VALUE;
419 04fd3e81 Baptiste Coudurier
        }
420
        if (type == 0) {
421 6298eb81 Baptiste Coudurier
            if ((ret = flv_get_extradata(s, st, size)) < 0)
422 04fd3e81 Baptiste Coudurier
                return ret;
423
            goto retry;
424
        }
425
    }
426
427 6298eb81 Baptiste Coudurier
    ret= av_get_packet(s->pb, pkt, size);
428 d4f5d74a Garrick Meeker
    if (ret <= 0) {
429 6f3e0b21 Panagiotis Issaris
        return AVERROR(EIO);
430 d4f5d74a Garrick Meeker
    }
431
    /* note: we need to modify the packet size here to handle the last
432
       packet */
433
    pkt->size = ret;
434 7ef94d22 Baptiste Coudurier
    pkt->dts = dts;
435 ebd61055 Baptiste Coudurier
    pkt->pts = pts == AV_NOPTS_VALUE ? dts : pts;
436 d4f5d74a Garrick Meeker
    pkt->stream_index = st->index;
437 115329f1 Diego Biurrun
438 6cac3a3b Allan Hsu
    if (is_audio || ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY))
439 bb270c08 Diego Biurrun
        pkt->flags |= PKT_FLAG_KEY;
440 115329f1 Diego Biurrun
441 d4f5d74a Garrick Meeker
    return ret;
442
}
443
444 d2a067d1 Måns Rullgård
AVInputFormat flv_demuxer = {
445 d4f5d74a Garrick Meeker
    "flv",
446 bde15e74 Stefano Sabatini
    NULL_IF_CONFIG_SMALL("FLV format"),
447 ebd61055 Baptiste Coudurier
    sizeof(FLVContext),
448 d4f5d74a Garrick Meeker
    flv_probe,
449
    flv_read_header,
450
    flv_read_packet,
451
    .extensions = "flv",
452
    .value = CODEC_ID_FLV1,
453
};