1 /*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 #include "libavutil/intreadwrite.h"
20
21 #include "avcodec.h"
22
parse(AVCodecParserContext * s,AVCodecContext * avctx,const uint8_t ** poutbuf,int * poutbuf_size,const uint8_t * buf,int buf_size)23 static int parse(AVCodecParserContext *s,
24 AVCodecContext *avctx,
25 const uint8_t **poutbuf, int *poutbuf_size,
26 const uint8_t *buf, int buf_size)
27 {
28 unsigned int frame_type;
29 unsigned int profile;
30
31 *poutbuf = buf;
32 *poutbuf_size = buf_size;
33
34 if (buf_size < 3)
35 return buf_size;
36
37 frame_type = buf[0] & 1;
38 profile = (buf[0] >> 1) & 7;
39 if (profile > 3) {
40 av_log(avctx, AV_LOG_ERROR, "Invalid profile %u.\n", profile);
41 return buf_size;
42 }
43
44 avctx->profile = profile;
45 s->key_frame = frame_type == 0;
46 s->pict_type = frame_type ? AV_PICTURE_TYPE_P : AV_PICTURE_TYPE_I;
47 s->format = AV_PIX_FMT_YUV420P;
48 s->field_order = AV_FIELD_PROGRESSIVE;
49 s->picture_structure = AV_PICTURE_STRUCTURE_FRAME;
50
51 if (frame_type == 0) {
52 unsigned int sync_code;
53 unsigned int width, height;
54
55 if (buf_size < 10)
56 return buf_size;
57
58 sync_code = AV_RL24(buf + 3);
59 if (sync_code != 0x2a019d) {
60 av_log(avctx, AV_LOG_ERROR, "Invalid sync code %06x.\n", sync_code);
61 return buf_size;
62 }
63
64 width = AV_RL16(buf + 6) & 0x3fff;
65 height = AV_RL16(buf + 8) & 0x3fff;
66
67 s->width = width;
68 s->height = height;
69 s->coded_width = FFALIGN(width, 16);
70 s->coded_height = FFALIGN(height, 16);
71 }
72
73 return buf_size;
74 }
75
76 AVCodecParser ff_vp8_parser = {
77 .codec_ids = { AV_CODEC_ID_VP8 },
78 .parser_parse = parse,
79 };
80