1/*
2 * RV30/40 parser
3 * Copyright (c) 2011 Konstantin Shishkov
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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 "config_components.h"
28
29#include "parser.h"
30#include "libavutil/intreadwrite.h"
31
32typedef struct RV34ParseContext {
33    ParseContext pc;
34    int64_t key_dts;
35    int key_pts;
36} RV34ParseContext;
37
38static const int rv_to_av_frame_type[4] = {
39    AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B,
40};
41
42static int rv34_parse(AVCodecParserContext *s,
43                      AVCodecContext *avctx,
44                      const uint8_t **poutbuf, int *poutbuf_size,
45                      const uint8_t *buf, int buf_size)
46{
47    RV34ParseContext *pc = s->priv_data;
48    int type, pts, hdr;
49
50    if (buf_size < 13 + *buf * 8) {
51        *poutbuf = buf;
52        *poutbuf_size = buf_size;
53        return buf_size;
54    }
55
56    hdr = AV_RB32(buf + 9 + *buf * 8);
57    if (avctx->codec_id == AV_CODEC_ID_RV30) {
58        type = (hdr >> 27) & 3;
59        pts  = (hdr >>  7) & 0x1FFF;
60    } else {
61        type = (hdr >> 29) & 3;
62        pts  = (hdr >>  6) & 0x1FFF;
63    }
64
65    if (type != 3 && s->pts != AV_NOPTS_VALUE) {
66        pc->key_dts = s->pts;
67        pc->key_pts = pts;
68    } else {
69        if (type != 3)
70            s->pts = pc->key_dts + ((pts - pc->key_pts) & 0x1FFF);
71        else
72            s->pts = pc->key_dts - ((pc->key_pts - pts) & 0x1FFF);
73    }
74    s->pict_type = rv_to_av_frame_type[type];
75
76    *poutbuf = buf;
77    *poutbuf_size = buf_size;
78    return buf_size;
79}
80
81#if CONFIG_RV30_PARSER
82const AVCodecParser ff_rv30_parser = {
83    .codec_ids      = { AV_CODEC_ID_RV30 },
84    .priv_data_size = sizeof(RV34ParseContext),
85    .parser_parse   = rv34_parse,
86};
87#endif
88
89#if CONFIG_RV40_PARSER
90const AVCodecParser ff_rv40_parser = {
91    .codec_ids      = { AV_CODEC_ID_RV40 },
92    .priv_data_size = sizeof(RV34ParseContext),
93    .parser_parse   = rv34_parse,
94};
95#endif
96