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
29typedef struct IPUParseContext {
30    ParseContext pc;
31} IPUParseContext;
32
33static int ipu_parse(AVCodecParserContext *s, AVCodecContext *avctx,
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
41    s->pict_type = AV_PICTURE_TYPE_NONE;
42    s->duration  = 1;
43
44    *poutbuf_size = 0;
45    *poutbuf = NULL;
46
47    if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
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
72const AVCodecParser ff_ipu_parser = {
73    .codec_ids      = { AV_CODEC_ID_IPU },
74    .priv_data_size = sizeof(IPUParseContext),
75    .parser_parse   = ipu_parse,
76    .parser_close   = ff_parse_close,
77};
78