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"
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;
46 for (i = 0; i < buf_size; i++) {
47 state = (state << 8) | buf[i];
48 if (ff_dnxhd_check_header_prefix(state & 0xffffffffff00LL) != 0) {
58 if (pic_found && !dctx->remaining) {
59 if (!buf_size) /* EOF considered as end of frame */
61 for (; i < buf_size; i++) {
63 state = (state << 8) | buf[i];
65 if (dctx->cur_byte == 24) {
66 dctx->h = (state >> 32) & 0xFFFF;
67 } else if (dctx->cur_byte == 26) {
68 dctx->w = (state >> 32) & 0xFFFF;
69 } else if (dctx->cur_byte == 42) {
70 int cid = (state >> 32) & 0xFFFFFFFF;
75 dctx->remaining = avpriv_dnxhd_get_frame_size(cid);
76 if (dctx->remaining <= 0) {
77 dctx->remaining = ff_dnxhd_get_hr_frame_size(cid, dctx->w, dctx->h);
78 if (dctx->remaining <= 0)
79 return dctx->remaining;
81 if (buf_size - i + 47 >= dctx->remaining) {
82 int remaining = dctx->remaining;
84 pc->frame_start_found = 0;
90 dctx->remaining -= buf_size;
94 } else if (pic_found) {
95 if (dctx->remaining > buf_size) {
96 dctx->remaining -= buf_size;
98 int remaining = dctx->remaining;
100 pc->frame_start_found = 0;
107 pc->frame_start_found = pic_found;
109 return END_NOT_FOUND;
112 static int dnxhd_parse(AVCodecParserContext *s,
113 AVCodecContext *avctx,
114 const uint8_t **poutbuf, int *poutbuf_size,
115 const uint8_t *buf, int buf_size)
117 DNXHDParserContext *dctx = s->priv_data;
118 ParseContext *pc = &dctx->pc;
121 if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
124 next = dnxhd_find_frame_end(dctx, buf, buf_size);
125 if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
132 *poutbuf_size = buf_size;
136 AVCodecParser ff_dnxhd_parser = {
137 .codec_ids = { AV_CODEC_ID_DNXHD },
138 .priv_data_size = sizeof(DNXHDParserContext),
139 .parser_parse = dnxhd_parse,
140 .parser_close = ff_parse_close,