FFmpeg
ipu_parser.c
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1 /*
2  * IPU parser
3  * Copyright (c) 2020 Paul B Mahol
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  * IPU parser
25  */
26 
27 #include "parser.h"
28 
29 typedef struct IPUParseContext {
32 
34  const uint8_t **poutbuf, int *poutbuf_size,
35  const uint8_t *buf, int buf_size)
36 {
37  IPUParseContext *ipc = s->priv_data;
38  uint32_t state = ipc->pc.state;
39  int next = END_NOT_FOUND, i = 0;
40 
42  s->duration = 1;
43 
44  *poutbuf_size = 0;
45  *poutbuf = NULL;
46 
48  next = buf_size;
49  } else {
50  for (; i < buf_size; i++) {
51  state = (state << 8) | buf[i];
52  if (state == 0x1b0) {
53  next = i + 1;
54  break;
55  }
56  }
57 
58  ipc->pc.state = state;
59  if (ff_combine_frame(&ipc->pc, next, &buf, &buf_size) < 0) {
60  *poutbuf = NULL;
61  *poutbuf_size = 0;
62  return buf_size;
63  }
64  }
65 
66  *poutbuf = buf;
67  *poutbuf_size = buf_size;
68 
69  return next;
70 }
71 
74  .priv_data_size = sizeof(IPUParseContext),
75  .parser_parse = ipu_parse,
76  .parser_close = ff_parse_close,
77 };
#define NULL
Definition: coverity.c:32
int codec_ids[5]
Definition: avcodec.h:3533
int duration
Duration of the current frame.
Definition: avcodec.h:3487
Undefined.
Definition: avutil.h:273
ParseContext pc
Definition: ipu_parser.c:30
uint8_t
int ff_combine_frame(ParseContext *pc, int next, const uint8_t **buf, int *buf_size)
Combine the (truncated) bitstream to a complete frame.
Definition: parser.c:234
void ff_parse_close(AVCodecParserContext *s)
Definition: parser.c:319
#define s(width, name)
Definition: cbs_vp9.c:257
static int ipu_parse(AVCodecParserContext *s, AVCodecContext *avctx, const uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size)
Definition: ipu_parser.c:33
main external API structure.
Definition: avcodec.h:531
uint32_t state
contains the last few bytes in MSB order
Definition: parser.h:33
AVCodecParser ff_ipu_parser
Definition: ipu_parser.c:72
#define END_NOT_FOUND
Definition: parser.h:40
static struct @323 state
#define PARSER_FLAG_COMPLETE_FRAMES
Definition: avcodec.h:3399
int i
Definition: input.c:407