Add ff_ prefix to data symbols of encoders, decoders, hwaccel, parsers, bsf.
[libav.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 != 7) {
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 == 7){
68 format = get_bits(&s->gb, 3);
69 if(format == 0 || format == 7){
70 av_log(s->avctx, AV_LOG_ERROR, "Wrong Intel H263 format\n");
71 return -1;
72 }
73 if(get_bits(&s->gb, 2))
74 av_log(s->avctx, AV_LOG_ERROR, "Bad value for reserved field\n");
75 s->loop_filter = get_bits1(&s->gb);
76 if(get_bits1(&s->gb))
77 av_log(s->avctx, AV_LOG_ERROR, "Bad value for reserved field\n");
78 if(get_bits1(&s->gb))
79 s->pb_frame = 2;
80 if(get_bits(&s->gb, 5))
81 av_log(s->avctx, AV_LOG_ERROR, "Bad value for reserved field\n");
82 if(get_bits(&s->gb, 5) != 1)
83 av_log(s->avctx, AV_LOG_ERROR, "Invalid marker\n");
84 }
85 if(format == 6){
86 int ar = get_bits(&s->gb, 4);
87 skip_bits(&s->gb, 9); // display width
88 skip_bits1(&s->gb);
89 skip_bits(&s->gb, 9); // display height
90 if(ar == 15){
91 skip_bits(&s->gb, 8); // aspect ratio - width
92 skip_bits(&s->gb, 8); // aspect ratio - height
93 }
94 }
95
96 s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
97 skip_bits1(&s->gb); /* Continuous Presence Multipoint mode: off */
98
99 if(s->pb_frame){
100 skip_bits(&s->gb, 3); //temporal reference for B-frame
101 skip_bits(&s->gb, 2); //dbquant
102 }
103
104 /* PEI */
105 while (get_bits1(&s->gb) != 0) {
106 skip_bits(&s->gb, 8);
107 }
108 s->f_code = 1;
109
110 s->y_dc_scale_table=
111 s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
112
113 ff_h263_show_pict_info(s);
114
115 return 0;
116 }
117
118 AVCodec ff_h263i_decoder = {
119 "h263i",
120 AVMEDIA_TYPE_VIDEO,
121 CODEC_ID_H263I,
122 sizeof(MpegEncContext),
123 ff_h263_decode_init,
124 NULL,
125 ff_h263_decode_end,
126 ff_h263_decode_frame,
127 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
128 .long_name = NULL_IF_CONFIG_SMALL("Intel H.263"),
129 .pix_fmts= ff_pixfmt_list_420,
130 };
131