3 * Copyright (c) 2013 Paul B Mahol
5 * This file is part of FFmpeg.
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.
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.
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
27 #include "libavutil/bswap.h"
30 typedef struct DPXParseContext {
34 uint32_t remaining_size;
38 static int dpx_parse(AVCodecParserContext *s, AVCodecContext *avctx,
39 const uint8_t **poutbuf, int *poutbuf_size,
40 const uint8_t *buf, int buf_size)
42 DPXParseContext *d = s->priv_data;
43 uint32_t state = d->pc.state;
44 int next = END_NOT_FOUND;
47 s->pict_type = AV_PICTURE_TYPE_I;
53 if (!d->pc.frame_start_found) {
54 for (; i < buf_size; i++) {
55 state = (state << 8) | buf[i];
56 if (state == MKBETAG('S','D','P','X') ||
57 state == MKTAG('S','D','P','X')) {
58 d->pc.frame_start_found = 1;
59 d->is_be = state == MKBETAG('S','D','P','X');
65 if (d->remaining_size) {
66 i = FFMIN(d->remaining_size, buf_size);
67 d->remaining_size -= i;
68 if (d->remaining_size)
74 for (;d->pc.frame_start_found && i < buf_size; i++) {
75 d->pc.state = (d->pc.state << 8) | buf[i];
77 d->fsize = d->is_be ? d->pc.state : av_bswap32(d->pc.state);
78 if (d->fsize <= 1664) {
79 d->index = d->pc.frame_start_found = 0;
83 if (d->fsize > buf_size - i + 19)
84 d->remaining_size = d->fsize - buf_size + i - 19;
86 next = d->fsize + i - 19;
93 if (ff_combine_frame(&d->pc, next, &buf, &buf_size) < 0)
96 d->index = d->pc.frame_start_found = 0;
99 *poutbuf_size = buf_size;
103 AVCodecParser ff_dpx_parser = {
104 .codec_ids = { AV_CODEC_ID_DPX },
105 .priv_data_size = sizeof(DPXParseContext),
106 .parser_parse = dpx_parse,
107 .parser_close = ff_parse_close,