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ffmpeg / libavformat / flvdec.c @ ba667e60

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1 d4f5d74a Garrick Meeker
/*
2 7fbde343 Aurelien Jacobs
 * FLV demuxer
3 406792e7 Diego Biurrun
 * Copyright (c) 2003 The FFmpeg Project
4 d4f5d74a Garrick Meeker
 *
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 d2718187 Baptiste Coudurier
27 df2bd71a Aurelien Jacobs
#include "libavutil/avstring.h"
28 c1c206b3 Justin Ruggles
#include "libavcodec/bytestream.h"
29 d2718187 Baptiste Coudurier
#include "libavcodec/mpeg4audio.h"
30 d4f5d74a Garrick Meeker
#include "avformat.h"
31 933e90a6 Anton Khirnov
#include "avio_internal.h"
32 6cac3a3b Allan Hsu
#include "flv.h"
33 d4f5d74a Garrick Meeker
34 ebd61055 Baptiste Coudurier
typedef struct {
35
    int wrong_dts; ///< wrong dts due to negative cts
36
} FLVContext;
37
38 d4f5d74a Garrick Meeker
static int flv_probe(AVProbeData *p)
39
{
40
    const uint8_t *d;
41
42
    d = p->buf;
43 37e34df5 Michael Niedermayer
    if (d[0] == 'F' && d[1] == 'L' && d[2] == 'V' && d[3] < 5 && d[5]==0 && AV_RB32(d+5)>8) {
44 74248229 Michael Niedermayer
        return AVPROBE_SCORE_MAX;
45 d4f5d74a Garrick Meeker
    }
46
    return 0;
47
}
48
49 428cc588 Allan Hsu
static void flv_set_audio_codec(AVFormatContext *s, AVStream *astream, int flv_codecid) {
50
    AVCodecContext *acodec = astream->codec;
51
    switch(flv_codecid) {
52
        //no distinction between S16 and S8 PCM codec flags
53 44de39f9 Michael Niedermayer
        case FLV_CODECID_PCM:
54 8e9efe43 Daniel Verkamp
            acodec->codec_id = acodec->bits_per_coded_sample == 8 ? CODEC_ID_PCM_U8 :
55 63613fe6 Måns Rullgård
#if HAVE_BIGENDIAN
56 58293e57 Michael Niedermayer
                                CODEC_ID_PCM_S16BE;
57
#else
58
                                CODEC_ID_PCM_S16LE;
59
#endif
60
            break;
61 428cc588 Allan Hsu
        case FLV_CODECID_PCM_LE:
62 8e9efe43 Daniel Verkamp
            acodec->codec_id = acodec->bits_per_coded_sample == 8 ? CODEC_ID_PCM_U8 : CODEC_ID_PCM_S16LE; break;
63 04fd3e81 Baptiste Coudurier
        case FLV_CODECID_AAC  : acodec->codec_id = CODEC_ID_AAC;                                    break;
64 428cc588 Allan Hsu
        case FLV_CODECID_ADPCM: acodec->codec_id = CODEC_ID_ADPCM_SWF;                              break;
65 f96d0eef Baptiste Coudurier
        case FLV_CODECID_SPEEX:
66
            acodec->codec_id = CODEC_ID_SPEEX;
67
            acodec->sample_rate = 16000;
68
            break;
69 57004ff1 Aurelien Jacobs
        case FLV_CODECID_MP3  : acodec->codec_id = CODEC_ID_MP3      ; astream->need_parsing = AVSTREAM_PARSE_FULL; break;
70 88cb61bb Alexander Wichers
        case FLV_CODECID_NELLYMOSER_8KHZ_MONO:
71 428cc588 Allan Hsu
            acodec->sample_rate = 8000; //in case metadata does not otherwise declare samplerate
72 caa7ad5d Thierry Foucu
            acodec->codec_id = CODEC_ID_NELLYMOSER;
73
            break;
74
        case FLV_CODECID_NELLYMOSER_16KHZ_MONO:
75
            acodec->sample_rate = 16000;
76
            acodec->codec_id = CODEC_ID_NELLYMOSER;
77
            break;
78 428cc588 Allan Hsu
        case FLV_CODECID_NELLYMOSER:
79 636b13c5 Benjamin Larsson
            acodec->codec_id = CODEC_ID_NELLYMOSER;
80
            break;
81 428cc588 Allan Hsu
        default:
82
            av_log(s, AV_LOG_INFO, "Unsupported audio codec (%x)\n", flv_codecid >> FLV_AUDIO_CODECID_OFFSET);
83
            acodec->codec_tag = flv_codecid >> FLV_AUDIO_CODECID_OFFSET;
84
    }
85
}
86
87
static int flv_set_video_codec(AVFormatContext *s, AVStream *vstream, int flv_codecid) {
88
    AVCodecContext *vcodec = vstream->codec;
89
    switch(flv_codecid) {
90
        case FLV_CODECID_H263  : vcodec->codec_id = CODEC_ID_FLV1   ; break;
91
        case FLV_CODECID_SCREEN: vcodec->codec_id = CODEC_ID_FLASHSV; break;
92 0aa6a518 Daniel Verkamp
        case FLV_CODECID_SCREEN2: vcodec->codec_id = CODEC_ID_FLASHSV2; break;
93 428cc588 Allan Hsu
        case FLV_CODECID_VP6   : vcodec->codec_id = CODEC_ID_VP6F   ;
94 99904603 Aurelien Jacobs
        case FLV_CODECID_VP6A  :
95
            if(flv_codecid == FLV_CODECID_VP6A)
96
                vcodec->codec_id = CODEC_ID_VP6A;
97 428cc588 Allan Hsu
            if(vcodec->extradata_size != 1) {
98
                vcodec->extradata_size = 1;
99
                vcodec->extradata = av_malloc(1);
100
            }
101 e63a3628 Anton Khirnov
            vcodec->extradata[0] = avio_r8(s->pb);
102 428cc588 Allan Hsu
            return 1; // 1 byte body size adjustment for flv_read_packet()
103 04fd3e81 Baptiste Coudurier
        case FLV_CODECID_H264:
104
            vcodec->codec_id = CODEC_ID_H264;
105
            return 3; // not 4, reading packet type will consume one byte
106 428cc588 Allan Hsu
        default:
107
            av_log(s, AV_LOG_INFO, "Unsupported video codec (%x)\n", flv_codecid);
108
            vcodec->codec_tag = flv_codecid;
109
    }
110
111
    return 0;
112
}
113
114 471fe57e Anton Khirnov
static int amf_get_string(AVIOContext *ioc, char *buffer, int buffsize) {
115 e63a3628 Anton Khirnov
    int length = avio_rb16(ioc);
116 cc38e063 Michael Niedermayer
    if(length >= buffsize) {
117 45a8a02a Anton Khirnov
        avio_skip(ioc, length);
118 cc38e063 Michael Niedermayer
        return -1;
119
    }
120 896bcd2e Michael Niedermayer
121 e63a3628 Anton Khirnov
    avio_read(ioc, buffer, length);
122 896bcd2e Michael Niedermayer
123 cc38e063 Michael Niedermayer
    buffer[length] = '\0';
124 896bcd2e Michael Niedermayer
125 cc38e063 Michael Niedermayer
    return length;
126 896bcd2e Michael Niedermayer
}
127
128 cb7e2c1c Kharkov Alexander
static int parse_keyframes_index(AVFormatContext *s, AVIOContext *ioc, AVStream *vstream, int64_t max_pos) {
129 0c4d4a93 Michael Niedermayer
    unsigned int timeslen = 0, fileposlen = 0, i;
130 cb7e2c1c Kharkov Alexander
    char str_val[256];
131
    int64_t *times = NULL;
132
    int64_t *filepositions = NULL;
133
    int ret = 0;
134 ba667e60 Kharkov Alexander
    int64_t initial_pos = url_ftell(ioc);
135 cb7e2c1c Kharkov Alexander
136
    while (avio_tell(ioc) < max_pos - 2 && amf_get_string(ioc, str_val, sizeof(str_val)) > 0) {
137 0c4d4a93 Michael Niedermayer
        int64_t** current_array;
138
        unsigned int arraylen;
139 cb7e2c1c Kharkov Alexander
140
        // Expect array object in context
141
        if (avio_r8(ioc) != AMF_DATA_TYPE_ARRAY)
142
            break;
143
144
        arraylen = avio_rb32(ioc);
145 0c4d4a93 Michael Niedermayer
        if(arraylen>>28)
146 cb7e2c1c Kharkov Alexander
            break;
147
148 0c4d4a93 Michael Niedermayer
        if       (!strcmp(KEYFRAMES_TIMESTAMP_TAG , str_val) && !times){
149
            current_array= &times;
150
            timeslen= arraylen;
151
        }else if (!strcmp(KEYFRAMES_BYTEOFFSET_TAG, str_val) && !filepositions){
152
            current_array= &filepositions;
153
            fileposlen= arraylen;
154
        }else // unexpected metatag inside keyframes, will not use such metadata for indexing
155
            break;
156
157
        if (!(*current_array = av_mallocz(sizeof(**current_array) * arraylen))) {
158
            ret = AVERROR(ENOMEM);
159
            goto finish;
160
        }
161
162 cb7e2c1c Kharkov Alexander
        for (i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++) {
163
            if (avio_r8(ioc) != AMF_DATA_TYPE_NUMBER)
164
                goto finish;
165 0c4d4a93 Michael Niedermayer
            current_array[0][i] = av_int2dbl(avio_rb64(ioc));
166 cb7e2c1c Kharkov Alexander
        }
167
    }
168
169 0c4d4a93 Michael Niedermayer
    if (timeslen == fileposlen) {
170
         for(i = 0; i < timeslen; i++)
171 cb7e2c1c Kharkov Alexander
             av_add_index_entry(vstream, filepositions[i], times[i]*1000, 0, 0, AVINDEX_KEYFRAME);
172 0c4d4a93 Michael Niedermayer
    } else
173 cb7e2c1c Kharkov Alexander
        av_log(s, AV_LOG_WARNING, "Invalid keyframes object, skipping.\n");
174
175
finish:
176
    av_freep(&times);
177
    av_freep(&filepositions);
178 ba667e60 Kharkov Alexander
    avio_seek(ioc, initial_pos, SEEK_SET);
179 cb7e2c1c Kharkov Alexander
    return ret;
180
}
181
182 4fe8a452 Pascal Massimino
static int amf_parse_object(AVFormatContext *s, AVStream *astream, AVStream *vstream, const char *key, int64_t max_pos, int depth) {
183 428cc588 Allan Hsu
    AVCodecContext *acodec, *vcodec;
184 471fe57e Anton Khirnov
    AVIOContext *ioc;
185 428cc588 Allan Hsu
    AMFDataType amf_type;
186 cc38e063 Michael Niedermayer
    char str_val[256];
187 428cc588 Allan Hsu
    double num_val;
188
189
    num_val = 0;
190 899681cd Björn Axelsson
    ioc = s->pb;
191 428cc588 Allan Hsu
192 e63a3628 Anton Khirnov
    amf_type = avio_r8(ioc);
193 428cc588 Allan Hsu
194
    switch(amf_type) {
195
        case AMF_DATA_TYPE_NUMBER:
196 e63a3628 Anton Khirnov
            num_val = av_int2dbl(avio_rb64(ioc)); break;
197 428cc588 Allan Hsu
        case AMF_DATA_TYPE_BOOL:
198 e63a3628 Anton Khirnov
            num_val = avio_r8(ioc); break;
199 428cc588 Allan Hsu
        case AMF_DATA_TYPE_STRING:
200 cc38e063 Michael Niedermayer
            if(amf_get_string(ioc, str_val, sizeof(str_val)) < 0)
201 428cc588 Allan Hsu
                return -1;
202
            break;
203
        case AMF_DATA_TYPE_OBJECT: {
204
            unsigned int keylen;
205
206 deff8a6d Justin Ruggles
            if (key && !strcmp(KEYFRAMES_TAG, key) && depth == 1)
207 cb7e2c1c Kharkov Alexander
                if (parse_keyframes_index(s, ioc, vstream, max_pos) < 0)
208
                    return -1;
209
210 384c9c2f Anton Khirnov
            while(avio_tell(ioc) < max_pos - 2 && (keylen = avio_rb16(ioc))) {
211 45a8a02a Anton Khirnov
                avio_skip(ioc, keylen); //skip key string
212 428cc588 Allan Hsu
                if(amf_parse_object(s, NULL, NULL, NULL, max_pos, depth + 1) < 0)
213
                    return -1; //if we couldn't skip, bomb out.
214
            }
215 e63a3628 Anton Khirnov
            if(avio_r8(ioc) != AMF_END_OF_OBJECT)
216 428cc588 Allan Hsu
                return -1;
217
        }
218
            break;
219
        case AMF_DATA_TYPE_NULL:
220
        case AMF_DATA_TYPE_UNDEFINED:
221
        case AMF_DATA_TYPE_UNSUPPORTED:
222
            break; //these take up no additional space
223
        case AMF_DATA_TYPE_MIXEDARRAY:
224 45a8a02a Anton Khirnov
            avio_skip(ioc, 4); //skip 32-bit max array index
225 384c9c2f Anton Khirnov
            while(avio_tell(ioc) < max_pos - 2 && amf_get_string(ioc, str_val, sizeof(str_val)) > 0) {
226 428cc588 Allan Hsu
                //this is the only case in which we would want a nested parse to not skip over the object
227 cc38e063 Michael Niedermayer
                if(amf_parse_object(s, astream, vstream, str_val, max_pos, depth + 1) < 0)
228 428cc588 Allan Hsu
                    return -1;
229
            }
230 e63a3628 Anton Khirnov
            if(avio_r8(ioc) != AMF_END_OF_OBJECT)
231 428cc588 Allan Hsu
                return -1;
232
            break;
233
        case AMF_DATA_TYPE_ARRAY: {
234
            unsigned int arraylen, i;
235
236 e63a3628 Anton Khirnov
            arraylen = avio_rb32(ioc);
237 384c9c2f Anton Khirnov
            for(i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++) {
238 428cc588 Allan Hsu
                if(amf_parse_object(s, NULL, NULL, NULL, max_pos, depth + 1) < 0)
239
                    return -1; //if we couldn't skip, bomb out.
240
            }
241
        }
242
            break;
243
        case AMF_DATA_TYPE_DATE:
244 45a8a02a Anton Khirnov
            avio_skip(ioc, 8 + 2); //timestamp (double) and UTC offset (int16)
245 428cc588 Allan Hsu
            break;
246
        default: //unsupported type, we couldn't skip
247
            return -1;
248
    }
249
250
    if(depth == 1 && key) { //only look for metadata values when we are not nested and key != NULL
251
        acodec = astream ? astream->codec : NULL;
252
        vcodec = vstream ? vstream->codec : NULL;
253
254
        if(amf_type == AMF_DATA_TYPE_BOOL) {
255 cc38e063 Michael Niedermayer
            av_strlcpy(str_val, num_val > 0 ? "true" : "false", sizeof(str_val));
256 2ef6c124 Stefano Sabatini
            av_metadata_set2(&s->metadata, key, str_val, 0);
257 428cc588 Allan Hsu
        } else if(amf_type == AMF_DATA_TYPE_NUMBER) {
258 cc38e063 Michael Niedermayer
            snprintf(str_val, sizeof(str_val), "%.f", num_val);
259 2ef6c124 Stefano Sabatini
            av_metadata_set2(&s->metadata, key, str_val, 0);
260 428cc588 Allan Hsu
            if(!strcmp(key, "duration")) s->duration = num_val * AV_TIME_BASE;
261 9a354fe3 Stefan de Konink
            else if(!strcmp(key, "videodatarate") && vcodec && 0 <= (int)(num_val * 1024.0))
262
                vcodec->bit_rate = num_val * 1024.0;
263 7e939205 Howard Chu
            else if(!strcmp(key, "audiodatarate") && acodec && 0 <= (int)(num_val * 1024.0))
264
                acodec->bit_rate = num_val * 1024.0;
265 df2bd71a Aurelien Jacobs
        } else if (amf_type == AMF_DATA_TYPE_STRING)
266 2ef6c124 Stefano Sabatini
            av_metadata_set2(&s->metadata, key, str_val, 0);
267 428cc588 Allan Hsu
    }
268
269
    return 0;
270
}
271
272 4fe8a452 Pascal Massimino
static int flv_read_metabody(AVFormatContext *s, int64_t next_pos) {
273 428cc588 Allan Hsu
    AMFDataType type;
274
    AVStream *stream, *astream, *vstream;
275 471fe57e Anton Khirnov
    AVIOContext *ioc;
276 4eec2606 Michael Niedermayer
    int i;
277 cc38e063 Michael Niedermayer
    char buffer[11]; //only needs to hold the string "onMetaData". Anything longer is something we don't want.
278 428cc588 Allan Hsu
279
    astream = NULL;
280
    vstream = NULL;
281 899681cd Björn Axelsson
    ioc = s->pb;
282 428cc588 Allan Hsu
283
    //first object needs to be "onMetaData" string
284 e63a3628 Anton Khirnov
    type = avio_r8(ioc);
285 cc38e063 Michael Niedermayer
    if(type != AMF_DATA_TYPE_STRING || amf_get_string(ioc, buffer, sizeof(buffer)) < 0 || strcmp(buffer, "onMetaData"))
286 428cc588 Allan Hsu
        return -1;
287
288
    //find the streams now so that amf_parse_object doesn't need to do the lookup every time it is called.
289
    for(i = 0; i < s->nb_streams; i++) {
290
        stream = s->streams[i];
291 72415b2a Stefano Sabatini
        if     (stream->codec->codec_type == AVMEDIA_TYPE_AUDIO) astream = stream;
292
        else if(stream->codec->codec_type == AVMEDIA_TYPE_VIDEO) vstream = stream;
293 428cc588 Allan Hsu
    }
294
295
    //parse the second object (we want a mixed array)
296 cc38e063 Michael Niedermayer
    if(amf_parse_object(s, astream, vstream, buffer, next_pos, 0) < 0)
297 428cc588 Allan Hsu
        return -1;
298
299
    return 0;
300
}
301
302 6f910bcf Michael Niedermayer
static AVStream *create_stream(AVFormatContext *s, int is_audio){
303
    AVStream *st = av_new_stream(s, is_audio);
304
    if (!st)
305
        return NULL;
306 72415b2a Stefano Sabatini
    st->codec->codec_type = is_audio ? AVMEDIA_TYPE_AUDIO : AVMEDIA_TYPE_VIDEO;
307 19719bc6 Baptiste Coudurier
    av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
308 6f910bcf Michael Niedermayer
    return st;
309
}
310
311 d4f5d74a Garrick Meeker
static int flv_read_header(AVFormatContext *s,
312
                           AVFormatParameters *ap)
313
{
314 15f14fc7 Michael Niedermayer
    int offset, flags;
315 d4f5d74a Garrick Meeker
316 45a8a02a Anton Khirnov
    avio_skip(s->pb, 4);
317 e63a3628 Anton Khirnov
    flags = avio_r8(s->pb);
318 031311cb Alex Beregszaszi
    /* old flvtool cleared this field */
319
    /* FIXME: better fix needed */
320
    if (!flags) {
321
        flags = FLV_HEADER_FLAG_HASVIDEO | FLV_HEADER_FLAG_HASAUDIO;
322
        av_log(s, AV_LOG_WARNING, "Broken FLV file, which says no streams present, this might fail\n");
323
    }
324 d4f5d74a Garrick Meeker
325 b41497e9 Michael Niedermayer
    if((flags & (FLV_HEADER_FLAG_HASVIDEO|FLV_HEADER_FLAG_HASAUDIO))
326
             != (FLV_HEADER_FLAG_HASVIDEO|FLV_HEADER_FLAG_HASAUDIO))
327
        s->ctx_flags |= AVFMTCTX_NOHEADER;
328
329 4eb0c665 Michael Niedermayer
    if(flags & FLV_HEADER_FLAG_HASVIDEO){
330 6f910bcf Michael Niedermayer
        if(!create_stream(s, 0))
331 769e10f0 Panagiotis Issaris
            return AVERROR(ENOMEM);
332 4eb0c665 Michael Niedermayer
    }
333
    if(flags & FLV_HEADER_FLAG_HASAUDIO){
334 6f910bcf Michael Niedermayer
        if(!create_stream(s, 1))
335 769e10f0 Panagiotis Issaris
            return AVERROR(ENOMEM);
336 4eb0c665 Michael Niedermayer
    }
337
338 e63a3628 Anton Khirnov
    offset = avio_rb32(s->pb);
339 f59d8ff8 Anton Khirnov
    avio_seek(s->pb, offset, SEEK_SET);
340 45a8a02a Anton Khirnov
    avio_skip(s->pb, 4);
341 d4f5d74a Garrick Meeker
342 aeb20f7f Nazo
    s->start_time = 0;
343
344 d4f5d74a Garrick Meeker
    return 0;
345
}
346
347 04fd3e81 Baptiste Coudurier
static int flv_get_extradata(AVFormatContext *s, AVStream *st, int size)
348
{
349
    av_free(st->codec->extradata);
350
    st->codec->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);
351
    if (!st->codec->extradata)
352
        return AVERROR(ENOMEM);
353
    st->codec->extradata_size = size;
354 e63a3628 Anton Khirnov
    avio_read(s->pb, st->codec->extradata, st->codec->extradata_size);
355 04fd3e81 Baptiste Coudurier
    return 0;
356
}
357
358 d4f5d74a Garrick Meeker
static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
359
{
360 ebd61055 Baptiste Coudurier
    FLVContext *flv = s->priv_data;
361 4fe8a452 Pascal Massimino
    int ret, i, type, size, flags, is_audio;
362
    int64_t next, pos;
363 ebd61055 Baptiste Coudurier
    int64_t dts, pts = AV_NOPTS_VALUE;
364 923bd441 Alex Beregszaszi
    AVStream *st = NULL;
365 115329f1 Diego Biurrun
366 45a8a02a Anton Khirnov
 for(;;avio_skip(s->pb, 4)){ /* pkt size is repeated at end. skip it */
367 384c9c2f Anton Khirnov
    pos = avio_tell(s->pb);
368 e63a3628 Anton Khirnov
    type = avio_r8(s->pb);
369
    size = avio_rb24(s->pb);
370
    dts = avio_rb24(s->pb);
371
    dts |= avio_r8(s->pb) << 24;
372 7ef94d22 Baptiste Coudurier
//    av_log(s, AV_LOG_DEBUG, "type:%d, size:%d, dts:%d\n", type, size, dts);
373 899681cd Björn Axelsson
    if (url_feof(s->pb))
374 0e9602ef Peter Ross
        return AVERROR_EOF;
375 45a8a02a Anton Khirnov
    avio_skip(s->pb, 3); /* stream id, always 0 */
376 d4f5d74a Garrick Meeker
    flags = 0;
377 115329f1 Diego Biurrun
378 068f2a22 Michael Niedermayer
    if(size == 0)
379
        continue;
380 115329f1 Diego Biurrun
381 384c9c2f Anton Khirnov
    next= size + avio_tell(s->pb);
382 dd9f5916 Michael Niedermayer
383 6cac3a3b Allan Hsu
    if (type == FLV_TAG_TYPE_AUDIO) {
384 068f2a22 Michael Niedermayer
        is_audio=1;
385 e63a3628 Anton Khirnov
        flags = avio_r8(s->pb);
386 6298eb81 Baptiste Coudurier
        size--;
387 6cac3a3b Allan Hsu
    } else if (type == FLV_TAG_TYPE_VIDEO) {
388 068f2a22 Michael Niedermayer
        is_audio=0;
389 e63a3628 Anton Khirnov
        flags = avio_r8(s->pb);
390 6298eb81 Baptiste Coudurier
        size--;
391 3d9aecb0 Baptiste Coudurier
        if ((flags & 0xf0) == 0x50) /* video info / command frame */
392
            goto skip;
393 d4f5d74a Garrick Meeker
    } else {
394 09e54e1f Aurelien Jacobs
        if (type == FLV_TAG_TYPE_META && size > 13+1+4)
395 428cc588 Allan Hsu
            flv_read_metabody(s, next);
396
        else /* skip packet */
397 e1d8d7bb Art Clarke
            av_log(s, AV_LOG_DEBUG, "skipping flv packet: type %d, size %d, flags %d\n", type, size, flags);
398 3d9aecb0 Baptiste Coudurier
    skip:
399 f59d8ff8 Anton Khirnov
        avio_seek(s->pb, next, SEEK_SET);
400 ded01499 Michael Niedermayer
        continue;
401 d4f5d74a Garrick Meeker
    }
402
403 ae58b54b Baptiste Coudurier
    /* skip empty data packets */
404
    if (!size)
405
        continue;
406
407 d4f5d74a Garrick Meeker
    /* now find stream */
408
    for(i=0;i<s->nb_streams;i++) {
409
        st = s->streams[i];
410 068f2a22 Michael Niedermayer
        if (st->id == is_audio)
411
            break;
412 d4f5d74a Garrick Meeker
    }
413 068f2a22 Michael Niedermayer
    if(i == s->nb_streams){
414 c1023470 Benoit Fouet
        av_log(s, AV_LOG_ERROR, "invalid stream\n");
415 c8652b57 Michael Niedermayer
        st= create_stream(s, is_audio);
416 a33cfa30 Michael Niedermayer
        s->ctx_flags &= ~AVFMTCTX_NOHEADER;
417 6ed08157 Michael Niedermayer
    }
418 c1023470 Benoit Fouet
//    av_log(s, AV_LOG_DEBUG, "%d %X %d \n", is_audio, flags, st->discard);
419 6cac3a3b Allan Hsu
    if(  (st->discard >= AVDISCARD_NONKEY && !((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY ||         is_audio))
420
       ||(st->discard >= AVDISCARD_BIDIR  &&  ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_DISP_INTER && !is_audio))
421 f3356e9c Michael Niedermayer
       || st->discard >= AVDISCARD_ALL
422
       ){
423 f59d8ff8 Anton Khirnov
        avio_seek(s->pb, next, SEEK_SET);
424 ded01499 Michael Niedermayer
        continue;
425 b9866ebc Michael Niedermayer
    }
426 6cac3a3b Allan Hsu
    if ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY)
427 7ef94d22 Baptiste Coudurier
        av_add_index_entry(st, pos, dts, size, 0, AVINDEX_KEYFRAME);
428 068f2a22 Michael Niedermayer
    break;
429
 }
430
431 15f14fc7 Michael Niedermayer
    // if not streamed and no duration from metadata then seek to end to find the duration from the timestamps
432 8978feda Anton Khirnov
    if(s->pb->seekable && (!s->duration || s->duration==AV_NOPTS_VALUE)){
433 15f14fc7 Michael Niedermayer
        int size;
434 384c9c2f Anton Khirnov
        const int64_t pos= avio_tell(s->pb);
435 db44ea96 Anton Khirnov
        const int64_t fsize= avio_size(s->pb);
436 f59d8ff8 Anton Khirnov
        avio_seek(s->pb, fsize-4, SEEK_SET);
437 e63a3628 Anton Khirnov
        size= avio_rb32(s->pb);
438 f59d8ff8 Anton Khirnov
        avio_seek(s->pb, fsize-3-size, SEEK_SET);
439 e63a3628 Anton Khirnov
        if(size == avio_rb24(s->pb) + 11){
440
            uint32_t ts = avio_rb24(s->pb);
441
            ts |= avio_r8(s->pb) << 24;
442 b126dee9 Martin Storsjö
            s->duration = ts * (int64_t)AV_TIME_BASE / 1000;
443 15f14fc7 Michael Niedermayer
        }
444 f59d8ff8 Anton Khirnov
        avio_seek(s->pb, pos, SEEK_SET);
445 15f14fc7 Michael Niedermayer
    }
446
447 068f2a22 Michael Niedermayer
    if(is_audio){
448 2f3d7ea9 Michael Niedermayer
        if(!st->codec->channels || !st->codec->sample_rate || !st->codec->bits_per_coded_sample) {
449 6cac3a3b Allan Hsu
            st->codec->channels = (flags & FLV_AUDIO_CHANNEL_MASK) == FLV_STEREO ? 2 : 1;
450 7f8cd075 Baptiste Coudurier
            st->codec->sample_rate = (44100 << ((flags & FLV_AUDIO_SAMPLERATE_MASK) >> FLV_AUDIO_SAMPLERATE_OFFSET) >> 3);
451 dd1c8f3e Luca Abeni
            st->codec->bits_per_coded_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;
452 2f3d7ea9 Michael Niedermayer
        }
453
        if(!st->codec->codec_id){
454 428cc588 Allan Hsu
            flv_set_audio_codec(s, st, flags & FLV_AUDIO_CODECID_MASK);
455 068f2a22 Michael Niedermayer
        }
456
    }else{
457 428cc588 Allan Hsu
        size -= flv_set_video_codec(s, st, flags & FLV_VIDEO_CODECID_MASK);
458 bb01a3f0 Michael Niedermayer
    }
459
460 04fd3e81 Baptiste Coudurier
    if (st->codec->codec_id == CODEC_ID_AAC ||
461
        st->codec->codec_id == CODEC_ID_H264) {
462 e63a3628 Anton Khirnov
        int type = avio_r8(s->pb);
463 04fd3e81 Baptiste Coudurier
        size--;
464
        if (st->codec->codec_id == CODEC_ID_H264) {
465 e63a3628 Anton Khirnov
            int32_t cts = (avio_rb24(s->pb)+0xff800000)^0xff800000; // sign extension
466 ebd61055 Baptiste Coudurier
            pts = dts + cts;
467
            if (cts < 0) { // dts are wrong
468
                flv->wrong_dts = 1;
469
                av_log(s, AV_LOG_WARNING, "negative cts, previous timestamps might be wrong\n");
470
            }
471
            if (flv->wrong_dts)
472
                dts = AV_NOPTS_VALUE;
473 04fd3e81 Baptiste Coudurier
        }
474
        if (type == 0) {
475 6298eb81 Baptiste Coudurier
            if ((ret = flv_get_extradata(s, st, size)) < 0)
476 04fd3e81 Baptiste Coudurier
                return ret;
477 d2718187 Baptiste Coudurier
            if (st->codec->codec_id == CODEC_ID_AAC) {
478
                MPEG4AudioConfig cfg;
479
                ff_mpeg4audio_get_config(&cfg, st->codec->extradata,
480
                                         st->codec->extradata_size);
481 5aea268d Alex Converse
                st->codec->channels = cfg.channels;
482 7d6096e4 Baptiste Coudurier
                if (cfg.ext_sample_rate)
483
                    st->codec->sample_rate = cfg.ext_sample_rate;
484
                else
485
                    st->codec->sample_rate = cfg.sample_rate;
486 9ef5a9de Luca Barbato
                av_dlog(s, "mp4a config channels %d sample rate %d\n",
487 d2718187 Baptiste Coudurier
                        st->codec->channels, st->codec->sample_rate);
488
            }
489
490 527c2e64 Howard Chu
            ret = AVERROR(EAGAIN);
491
            goto leave;
492 04fd3e81 Baptiste Coudurier
        }
493
    }
494
495 fcb4228c Baptiste Coudurier
    /* skip empty data packets */
496 527c2e64 Howard Chu
    if (!size) {
497
        ret = AVERROR(EAGAIN);
498
        goto leave;
499
    }
500 fcb4228c Baptiste Coudurier
501 6298eb81 Baptiste Coudurier
    ret= av_get_packet(s->pb, pkt, size);
502 634b927f Michael Niedermayer
    if (ret < 0) {
503 6f3e0b21 Panagiotis Issaris
        return AVERROR(EIO);
504 d4f5d74a Garrick Meeker
    }
505
    /* note: we need to modify the packet size here to handle the last
506
       packet */
507
    pkt->size = ret;
508 7ef94d22 Baptiste Coudurier
    pkt->dts = dts;
509 ebd61055 Baptiste Coudurier
    pkt->pts = pts == AV_NOPTS_VALUE ? dts : pts;
510 d4f5d74a Garrick Meeker
    pkt->stream_index = st->index;
511 115329f1 Diego Biurrun
512 6cac3a3b Allan Hsu
    if (is_audio || ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY))
513 cc947f04 Jean-Daniel Dupas
        pkt->flags |= AV_PKT_FLAG_KEY;
514 115329f1 Diego Biurrun
515 527c2e64 Howard Chu
leave:
516 45a8a02a Anton Khirnov
    avio_skip(s->pb, 4);
517 d4f5d74a Garrick Meeker
    return ret;
518
}
519
520 fc8fa007 Howard Chu
static int flv_read_seek(AVFormatContext *s, int stream_index,
521
    int64_t ts, int flags)
522
{
523 933e90a6 Anton Khirnov
    return ffio_read_seek(s->pb, stream_index, ts, flags);
524 fc8fa007 Howard Chu
}
525
526
#if 0 /* don't know enough to implement this */
527
static int flv_read_seek2(AVFormatContext *s, int stream_index,
528
    int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
529
{
530
    int ret = AVERROR(ENOSYS);
531

532
    if (ts - min_ts > (uint64_t)(max_ts - ts)) flags |= AVSEEK_FLAG_BACKWARD;
533

534 8978feda Anton Khirnov
    if (!s->pb->seekable) {
535 fc8fa007 Howard Chu
        if (stream_index < 0) {
536
            stream_index = av_find_default_stream_index(s);
537
            if (stream_index < 0)
538
                return -1;
539

540
            /* timestamp for default must be expressed in AV_TIME_BASE units */
541
            ts = av_rescale_rnd(ts, 1000, AV_TIME_BASE,
542
                flags & AVSEEK_FLAG_BACKWARD ? AV_ROUND_DOWN : AV_ROUND_UP);
543
        }
544 933e90a6 Anton Khirnov
        ret = ffio_read_seek(s->pb, stream_index, ts, flags);
545 fc8fa007 Howard Chu
    }
546

547
    if (ret == AVERROR(ENOSYS))
548
        ret = av_seek_frame(s, stream_index, ts, flags);
549
    return ret;
550
}
551
#endif
552
553 66355be3 Diego Elio Pettenò
AVInputFormat ff_flv_demuxer = {
554 d4f5d74a Garrick Meeker
    "flv",
555 bde15e74 Stefano Sabatini
    NULL_IF_CONFIG_SMALL("FLV format"),
556 ebd61055 Baptiste Coudurier
    sizeof(FLVContext),
557 d4f5d74a Garrick Meeker
    flv_probe,
558
    flv_read_header,
559
    flv_read_packet,
560 fc8fa007 Howard Chu
    .read_seek = flv_read_seek,
561
#if 0
562
    .read_seek2 = flv_read_seek2,
563
#endif
564 d4f5d74a Garrick Meeker
    .extensions = "flv",
565
    .value = CODEC_ID_FLV1,
566
};