FFmpeg
rv34_parser.c
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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 "parser.h"
28 #include "libavutil/intreadwrite.h"
29 
30 typedef struct RV34ParseContext {
32  int64_t key_dts;
33  int key_pts;
35 
36 static const int rv_to_av_frame_type[4] = {
38 };
39 
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 == AV_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 #if CONFIG_RV30_PARSER
82  .priv_data_size = sizeof(RV34ParseContext),
83  .parser_parse = rv34_parse,
84 };
85 #endif
86 
87 #if CONFIG_RV40_PARSER
90  .priv_data_size = sizeof(RV34ParseContext),
91  .parser_parse = rv34_parse,
92 };
93 #endif
rv34_parse
static int rv34_parse(AVCodecParserContext *s, AVCodecContext *avctx, const uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size)
Definition: rv34_parser.c:40
rv_to_av_frame_type
static const int rv_to_av_frame_type[4]
Definition: rv34_parser.c:36
RV34ParseContext::key_pts
int key_pts
Definition: rv34_parser.c:33
ParseContext
Definition: parser.h:28
type
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf type
Definition: writing_filters.txt:86
pts
static int64_t pts
Definition: transcode_aac.c:652
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:257
ff_rv40_parser
const AVCodecParser ff_rv40_parser
RV34ParseContext::pc
ParseContext pc
Definition: rv34_parser.c:31
AVCodecContext::codec_id
enum AVCodecID codec_id
Definition: avcodec.h:394
AVCodecParser::codec_ids
int codec_ids[5]
Definition: avcodec.h:2922
ff_rv30_parser
const AVCodecParser ff_rv30_parser
AV_PICTURE_TYPE_I
@ AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:274
AV_NOPTS_VALUE
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
AV_RB32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
Definition: bytestream.h:96
AV_CODEC_ID_RV30
@ AV_CODEC_ID_RV30
Definition: codec_id.h:118
AV_CODEC_ID_RV40
@ AV_CODEC_ID_RV40
Definition: codec_id.h:119
RV34ParseContext::key_dts
int64_t key_dts
Definition: rv34_parser.c:32
parser.h
AVCodecParserContext
Definition: avcodec.h:2762
AVCodecContext
main external API structure.
Definition: avcodec.h:384
AV_PICTURE_TYPE_B
@ AV_PICTURE_TYPE_B
Bi-dir predicted.
Definition: avutil.h:276
AV_PICTURE_TYPE_P
@ AV_PICTURE_TYPE_P
Predicted.
Definition: avutil.h:275
AVCodecParser
Definition: avcodec.h:2921
RV34ParseContext
Definition: rv34_parser.c:30