Remove a tab, somehow it sneaked past the hooks in the merge war.
[ffmpeg.git] / libavcodec / intelh263dec.c
1 /*
2  * H.263i decoder
3  *
4  * This file is part of FFmpeg.
5  *
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.
10  *
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.
15  *
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
19  */
20
21 #include "mpegvideo.h"
22 #include "h263.h"
23
24 /* don't understand why they choose a different header ! */
25 int ff_intel_h263_decode_picture_header(MpegEncContext *s)
26 {
27     int format;
28
29     /* picture header */
30     if (get_bits_long(&s->gb, 22) != 0x20) {
31         av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n");
32         return -1;
33     }
34     s->picture_number = get_bits(&s->gb, 8); /* picture timestamp */
35
36     if (get_bits1(&s->gb) != 1) {
37         av_log(s->avctx, AV_LOG_ERROR, "Bad marker\n");
38         return -1;      /* marker */
39     }
40     if (get_bits1(&s->gb) != 0) {
41         av_log(s->avctx, AV_LOG_ERROR, "Bad H263 id\n");
42         return -1;      /* h263 id */
43     }
44     skip_bits1(&s->gb);         /* split screen off */
45     skip_bits1(&s->gb);         /* camera  off */
46     skip_bits1(&s->gb);         /* freeze picture release off */
47
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");
51         return -1;
52     }
53     s->h263_plus = 0;
54
55     s->pict_type = FF_I_TYPE + get_bits1(&s->gb);
56
57     s->unrestricted_mv = get_bits1(&s->gb);
58     s->h263_long_vectors = s->unrestricted_mv;
59
60     if (get_bits1(&s->gb) != 0) {
61         av_log(s->avctx, AV_LOG_ERROR, "SAC not supported\n");
62         return -1;      /* SAC: off */
63     }
64     s->obmc= get_bits1(&s->gb);
65     s->pb_frame = get_bits1(&s->gb);
66
67     if (format < 6) {
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;
71     }
72     else {
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");
76             return -1;
77         }
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);
81         if(get_bits1(&s->gb))
82             av_log(s->avctx, AV_LOG_ERROR, "Bad value for reserved field\n");
83         if(get_bits1(&s->gb))
84             s->pb_frame = 2;
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");
89     }
90     if(format == 6){
91         int ar = get_bits(&s->gb, 4);
92         skip_bits(&s->gb, 9); // display width
93         skip_bits1(&s->gb);
94         skip_bits(&s->gb, 9); // display height
95         if(ar == 15){
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
98         }
99         else {
100             s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[ar];
101         }
102         if(s->avctx->sample_aspect_ratio.num == 0)
103             av_log(s->avctx, AV_LOG_ERROR, "Invalid aspect ratio\n");
104     }
105
106     s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
107     skip_bits1(&s->gb); /* Continuous Presence Multipoint mode: off */
108
109     if(s->pb_frame){
110         skip_bits(&s->gb, 3); //temporal reference for B-frame
111         skip_bits(&s->gb, 2); //dbquant
112     }
113
114     /* PEI */
115     while (get_bits1(&s->gb) != 0) {
116         skip_bits(&s->gb, 8);
117     }
118     s->f_code = 1;
119
120     s->y_dc_scale_table=
121     s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
122
123     ff_h263_show_pict_info(s);
124
125     return 0;
126 }
127
128 AVCodec ff_h263i_decoder = {
129     "h263i",
130     AVMEDIA_TYPE_VIDEO,
131     CODEC_ID_H263I,
132     sizeof(MpegEncContext),
133     ff_h263_decode_init,
134     NULL,
135     ff_h263_decode_end,
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,
140 };
141