4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #include "mpegvideo.h"
24 /* don't understand why they choose a different header ! */
25 int ff_intel_h263_decode_picture_header(MpegEncContext *s)
30 if (get_bits_long(&s->gb, 22) != 0x20) {
31 av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n");
34 s->picture_number = get_bits(&s->gb, 8); /* picture timestamp */
36 if (get_bits1(&s->gb) != 1) {
37 av_log(s->avctx, AV_LOG_ERROR, "Bad marker\n");
38 return -1; /* marker */
40 if (get_bits1(&s->gb) != 0) {
41 av_log(s->avctx, AV_LOG_ERROR, "Bad H263 id\n");
42 return -1; /* h263 id */
44 skip_bits1(&s->gb); /* split screen off */
45 skip_bits1(&s->gb); /* camera off */
46 skip_bits1(&s->gb); /* freeze picture release off */
48 format = get_bits(&s->gb, 3);
49 if (format == 0 || format == 6) {
50 av_log(s->avctx, AV_LOG_ERROR, "Intel H263 free format not supported\n");
55 s->pict_type = FF_I_TYPE + get_bits1(&s->gb);
57 s->unrestricted_mv = get_bits1(&s->gb);
58 s->h263_long_vectors = s->unrestricted_mv;
60 if (get_bits1(&s->gb) != 0) {
61 av_log(s->avctx, AV_LOG_ERROR, "SAC not supported\n");
62 return -1; /* SAC: off */
64 s->obmc= get_bits1(&s->gb);
65 s->pb_frame = get_bits1(&s->gb);
68 s->width = h263_format[format][0];
69 s->height = h263_format[format][1];
70 s->avctx->sample_aspect_ratio.num=12;s->avctx->sample_aspect_ratio.den=11;
73 format = get_bits(&s->gb, 3);
74 if(format == 0 || format == 7){
75 av_log(s->avctx, AV_LOG_ERROR, "Wrong Intel H263 format\n");
78 if(get_bits(&s->gb, 2))
79 av_log(s->avctx, AV_LOG_ERROR, "Bad value for reserved field\n");
80 s->loop_filter = get_bits1(&s->gb);
82 av_log(s->avctx, AV_LOG_ERROR, "Bad value for reserved field\n");
85 if(get_bits(&s->gb, 5))
86 av_log(s->avctx, AV_LOG_ERROR, "Bad value for reserved field\n");
87 if(get_bits(&s->gb, 5) != 1)
88 av_log(s->avctx, AV_LOG_ERROR, "Invalid marker\n");
91 int ar = get_bits(&s->gb, 4);
92 skip_bits(&s->gb, 9); // display width
94 skip_bits(&s->gb, 9); // display height
96 s->avctx->sample_aspect_ratio.num = get_bits(&s->gb, 8); // aspect ratio - width
97 s->avctx->sample_aspect_ratio.den = get_bits(&s->gb, 8); // aspect ratio - height
100 s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[ar];
102 if(s->avctx->sample_aspect_ratio.num == 0)
103 av_log(s->avctx, AV_LOG_ERROR, "Invalid aspect ratio\n");
106 s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
107 skip_bits1(&s->gb); /* Continuous Presence Multipoint mode: off */
110 skip_bits(&s->gb, 3); //temporal reference for B-frame
111 skip_bits(&s->gb, 2); //dbquant
115 while (get_bits1(&s->gb) != 0) {
116 skip_bits(&s->gb, 8);
121 s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
123 ff_h263_show_pict_info(s);
128 AVCodec ff_h263i_decoder = {
132 sizeof(MpegEncContext),
136 ff_h263_decode_frame,
137 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
138 .long_name = NULL_IF_CONFIG_SMALL("Intel H.263"),
139 .pix_fmts= ff_pixfmt_list_420,