vp8: Return stream format information from parser
[libav.git] / libavcodec / vp8_parser.c
1 /*
2 * This file is part of Libav.
3 *
4 * Libav 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 * Libav 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 Libav; 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
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 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 }
69
70 *poutbuf = buf;
71 *poutbuf_size = buf_size;
72 return buf_size;
73 }
74
75 AVCodecParser ff_vp8_parser = {
76 .codec_ids = { AV_CODEC_ID_VP8 },
77 .parser_parse = parse,
78 };