vp8: Return stream format information from parser
[libav.git] / libavcodec / vp8_parser.c
CommitLineData
4717f872 1/*
2912e87a 2 * This file is part of Libav.
4717f872 3 *
2912e87a 4 * Libav is free software; you can redistribute it and/or
4717f872
DC
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 *
2912e87a 9 * Libav is distributed in the hope that it will be useful,
4717f872
DC
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
2912e87a 15 * License along with Libav; if not, write to the Free Software
4717f872
DC
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
182cf170
MT
19#include "libavutil/intreadwrite.h"
20
21#include "avcodec.h"
4717f872
DC
22
23static int parse(AVCodecParserContext *s,
53c20f17
VG
24 AVCodecContext *avctx,
25 const uint8_t **poutbuf, int *poutbuf_size,
26 const uint8_t *buf, int buf_size)
4717f872 27{
182cf170
MT
28 unsigned int frame_type;
29 unsigned int profile;
30
31 if (buf_size < 3)
32 return AVERROR_INVALIDDATA;
33
34 frame_type = buf[0] & 1;
35 profile = (buf[0] >> 1) & 7;
36 if (profile > 3) {
37 av_log(avctx, AV_LOG_ERROR, "Invalid profile %u.\n", profile);
38 return AVERROR_INVALIDDATA;
39 }
40
41 avctx->profile = profile;
42 s->key_frame = frame_type == 0;
43 s->pict_type = frame_type ? AV_PICTURE_TYPE_P : AV_PICTURE_TYPE_I;
44 s->format = AV_PIX_FMT_YUV420P;
45 s->field_order = AV_FIELD_PROGRESSIVE;
46 s->picture_structure = AV_PICTURE_STRUCTURE_FRAME;
47
48 if (frame_type == 0) {
49 unsigned int sync_code;
50 unsigned int width, height;
51
52 if (buf_size < 10)
53 return AVERROR_INVALIDDATA;
54
55 sync_code = AV_RL24(buf + 3);
56 if (sync_code != 0x2a019d) {
57 av_log(avctx, AV_LOG_ERROR, "Invalid sync code %06x.\n", sync_code);
58 return AVERROR_INVALIDDATA;
59 }
60
61 width = AV_RL16(buf + 6) & 0x3fff;
62 height = AV_RL16(buf + 8) & 0x3fff;
63
64 s->width = width;
65 s->height = height;
66 s->coded_width = FFALIGN(width, 16);
67 s->coded_height = FFALIGN(height, 16);
68 }
4717f872 69
53c20f17 70 *poutbuf = buf;
4717f872
DC
71 *poutbuf_size = buf_size;
72 return buf_size;
73}
74
d36beb3f 75AVCodecParser ff_vp8_parser = {
53c20f17
VG
76 .codec_ids = { AV_CODEC_ID_VP8 },
77 .parser_parse = parse,
4717f872 78};