3 * Copyright (c) 2008 Baptiste Coudurier <baptiste.coudurier@free.fr>
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
29 #define DNXHD_HEADER_PREFIX 0x000002800100
34 int cur_field; /* first field is 0, second is 1 */
37 static int dnxhd_find_frame_end(DNXHDParserContext *dctx,
38 const uint8_t *buf, int buf_size)
40 ParseContext *pc = &dctx->pc;
41 uint64_t state = pc->state64;
42 int pic_found = pc->frame_start_found;
44 int interlaced = dctx->interlaced;
45 int cur_field = dctx->cur_field;
48 for (i = 0; i < buf_size; i++) {
49 state = (state << 8) | buf[i];
50 if ((state & 0xffffffffff00LL) == DNXHD_HEADER_PREFIX) {
53 interlaced = (state&2)>>1; /* byte following the 5-byte header prefix */
61 if (!buf_size) /* EOF considered as end of frame */
63 for (; i < buf_size; i++) {
64 state = (state << 8) | buf[i];
65 if ((state & 0xffffffffff00LL) == DNXHD_HEADER_PREFIX) {
66 if (!interlaced || dctx->cur_field) {
67 pc->frame_start_found = 0;
69 dctx->interlaced = interlaced;
73 /* continue, to get the second field */
74 dctx->interlaced = interlaced = (state&2)>>1;
75 dctx->cur_field = cur_field = state&1;
80 pc->frame_start_found = pic_found;
82 dctx->interlaced = interlaced;
83 dctx->cur_field = cur_field;
87 static int dnxhd_parse(AVCodecParserContext *s,
88 AVCodecContext *avctx,
89 const uint8_t **poutbuf, int *poutbuf_size,
90 const uint8_t *buf, int buf_size)
92 DNXHDParserContext *dctx = s->priv_data;
93 ParseContext *pc = &dctx->pc;
96 if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
99 next = dnxhd_find_frame_end(dctx, buf, buf_size);
100 if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
107 *poutbuf_size = buf_size;
111 AVCodecParser ff_dnxhd_parser = {
112 .codec_ids = { AV_CODEC_ID_DNXHD },
113 .priv_data_size = sizeof(DNXHDParserContext),
114 .parser_parse = dnxhd_parse,
115 .parser_close = ff_parse_close,