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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  }
73 
74  *poutbuf = buf;
75  *poutbuf_size = buf_size;
76  return buf_size;
77 }
78 
79 #if CONFIG_RV30_PARSER
80 AVCodecParser ff_rv30_parser = {
82  .priv_data_size = sizeof(RV34ParseContext),
83  .parser_parse = rv34_parse,
84 };
85 #endif
86 
87 #if CONFIG_RV40_PARSER
88 AVCodecParser ff_rv40_parser = {
90  .priv_data_size = sizeof(RV34ParseContext),
91  .parser_parse = rv34_parse,
92 };
93 #endif
const char * s
Definition: avisynth_c.h:631
static const int rv_to_av_frame_type[4]
Definition: rv34_parser.c:36
int codec_ids[5]
Definition: avcodec.h:5071
uint8_t
ParseContext pc
Definition: rv34_parser.c:31
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:87
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
enum AVCodecID codec_id
Definition: avcodec.h:1656
main external API structure.
Definition: avcodec.h:1639
void * buf
Definition: avisynth_c.h:553
GLint GLenum type
Definition: opengl_enc.c:105
static int64_t pts
Global timestamp for the audio frames.
Bi-dir predicted.
Definition: avutil.h:268
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:240
Predicted.
Definition: avutil.h:267