1/*
2 * RV30/40 parser
3 * Copyright (c) 2011 Konstantin Shishkov
4 *
5 * This file is part of Libav.
6 *
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22/**
23 * @file
24 * RV30/40 parser
25 */
26
27#include "parser.h"
28#include "libavutil/intreadwrite.h"
29
30typedef struct {
31    ParseContext pc;
32    int64_t key_dts;
33    int key_pts;
34} RV34ParseContext;
35
36static const int rv_to_av_frame_type[4] = {
37    AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B,
38};
39
40static int rv34_parse(AVCodecParserContext *s,
41                      AVCodecContext *avctx,
42                      const uint8_t **poutbuf, int *poutbuf_size,
43                      const uint8_t *buf, int buf_size)
44{
45    RV34ParseContext *pc = s->priv_data;
46    int type, pts, hdr;
47
48    if (buf_size < 13 + *buf * 8) {
49        *poutbuf = buf;
50        *poutbuf_size = buf_size;
51        return buf_size;
52    }
53
54    hdr = AV_RB32(buf + 9 + *buf * 8);
55    if (avctx->codec_id == CODEC_ID_RV30) {
56        type = (hdr >> 27) & 3;
57        pts  = (hdr >>  7) & 0x1FFF;
58    } else {
59        type = (hdr >> 29) & 3;
60        pts  = (hdr >>  6) & 0x1FFF;
61    }
62
63    if (type != 3 && s->pts != AV_NOPTS_VALUE) {
64        pc->key_dts = s->pts;
65        pc->key_pts = pts;
66    } else {
67        if (type != 3)
68            s->pts = pc->key_dts + ((pts - pc->key_pts) & 0x1FFF);
69        else
70            s->pts = pc->key_dts - ((pc->key_pts - pts) & 0x1FFF);
71    }
72    s->pict_type = rv_to_av_frame_type[type];
73
74    *poutbuf = buf;
75    *poutbuf_size = buf_size;
76    return buf_size;
77}
78
79#ifdef CONFIG_RV30_PARSER
80AVCodecParser ff_rv30_parser = {
81    .codec_ids      = { CODEC_ID_RV30 },
82    .priv_data_size = sizeof(RV34ParseContext),
83    .parser_parse   = rv34_parse,
84};
85#endif
86
87#ifdef CONFIG_RV40_PARSER
88AVCodecParser ff_rv40_parser = {
89    .codec_ids      = { CODEC_ID_RV40 },
90    .priv_data_size = sizeof(RV34ParseContext),
91    .parser_parse   = rv34_parse,
92};
93#endif
94