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
28 #include "dnxhddata.h"
33 int cur_field; /* first field is 0, second is 1 */
36 static int dnxhd_find_frame_end(DNXHDParserContext *dctx,
37 const uint8_t *buf, int buf_size)
39 ParseContext *pc = &dctx->pc;
40 uint64_t state = pc->state64;
41 int pic_found = pc->frame_start_found;
43 int interlaced = dctx->interlaced;
44 int cur_field = dctx->cur_field;
47 for (i = 0; i < buf_size; i++) {
48 state = (state << 8) | buf[i];
49 if (ff_dnxhd_check_header_prefix(state & 0xffffffffff00LL) != 0) {
52 interlaced = (state&2)>>1; /* byte following the 5-byte header prefix */
60 if (!buf_size) /* EOF considered as end of frame */
62 for (; i < buf_size; i++) {
63 state = (state << 8) | buf[i];
64 if (ff_dnxhd_check_header_prefix(state & 0xffffffffff00LL) != 0) {
65 if (!interlaced || dctx->cur_field) {
66 pc->frame_start_found = 0;
68 dctx->interlaced = interlaced;
72 /* continue, to get the second field */
73 dctx->interlaced = interlaced = (state&2)>>1;
74 dctx->cur_field = cur_field = state&1;
79 pc->frame_start_found = pic_found;
81 dctx->interlaced = interlaced;
82 dctx->cur_field = cur_field;
86 static int dnxhd_parse(AVCodecParserContext *s,
87 AVCodecContext *avctx,
88 const uint8_t **poutbuf, int *poutbuf_size,
89 const uint8_t *buf, int buf_size)
91 DNXHDParserContext *dctx = s->priv_data;
92 ParseContext *pc = &dctx->pc;
95 if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
98 next = dnxhd_find_frame_end(dctx, buf, buf_size);
99 if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
106 *poutbuf_size = buf_size;
110 AVCodecParser ff_dnxhd_parser = {
111 .codec_ids = { AV_CODEC_ID_DNXHD },
112 .priv_data_size = sizeof(DNXHDParserContext),
113 .parser_parse = dnxhd_parse,
114 .parser_close = ff_parse_close,