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2ba45a60 DM |
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 | if (get_bits_left(&s->gb) == 64) { /* special dummy frames */ | |
30 | return FRAME_SKIPPED; | |
31 | } | |
32 | ||
33 | /* picture header */ | |
34 | if (get_bits_long(&s->gb, 22) != 0x20) { | |
35 | av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n"); | |
36 | return -1; | |
37 | } | |
38 | s->picture_number = get_bits(&s->gb, 8); /* picture timestamp */ | |
39 | ||
40 | if (get_bits1(&s->gb) != 1) { | |
41 | av_log(s->avctx, AV_LOG_ERROR, "Bad marker\n"); | |
42 | return -1; /* marker */ | |
43 | } | |
44 | if (get_bits1(&s->gb) != 0) { | |
45 | av_log(s->avctx, AV_LOG_ERROR, "Bad H263 id\n"); | |
46 | return -1; /* h263 id */ | |
47 | } | |
48 | skip_bits1(&s->gb); /* split screen off */ | |
49 | skip_bits1(&s->gb); /* camera off */ | |
50 | skip_bits1(&s->gb); /* freeze picture release off */ | |
51 | ||
52 | format = get_bits(&s->gb, 3); | |
53 | if (format == 0 || format == 6) { | |
54 | av_log(s->avctx, AV_LOG_ERROR, "Intel H263 free format not supported\n"); | |
55 | return -1; | |
56 | } | |
57 | s->h263_plus = 0; | |
58 | ||
59 | s->pict_type = AV_PICTURE_TYPE_I + get_bits1(&s->gb); | |
60 | ||
61 | s->h263_long_vectors = get_bits1(&s->gb); | |
62 | ||
63 | if (get_bits1(&s->gb) != 0) { | |
64 | av_log(s->avctx, AV_LOG_ERROR, "SAC not supported\n"); | |
65 | return -1; /* SAC: off */ | |
66 | } | |
67 | s->obmc= get_bits1(&s->gb); | |
68 | s->unrestricted_mv = s->obmc || s->h263_long_vectors; | |
69 | s->pb_frame = get_bits1(&s->gb); | |
70 | ||
71 | if (format < 6) { | |
72 | s->width = ff_h263_format[format][0]; | |
73 | s->height = ff_h263_format[format][1]; | |
74 | s->avctx->sample_aspect_ratio.num = 12; | |
75 | s->avctx->sample_aspect_ratio.den = 11; | |
76 | } else { | |
77 | format = get_bits(&s->gb, 3); | |
78 | if(format == 0 || format == 7){ | |
79 | av_log(s->avctx, AV_LOG_ERROR, "Wrong Intel H263 format\n"); | |
80 | return -1; | |
81 | } | |
82 | if(get_bits(&s->gb, 2)) | |
83 | av_log(s->avctx, AV_LOG_ERROR, "Bad value for reserved field\n"); | |
84 | s->loop_filter = get_bits1(&s->gb) * !s->avctx->lowres; | |
85 | if(get_bits1(&s->gb)) | |
86 | av_log(s->avctx, AV_LOG_ERROR, "Bad value for reserved field\n"); | |
87 | if(get_bits1(&s->gb)) | |
88 | s->pb_frame = 2; | |
89 | if(get_bits(&s->gb, 5)) | |
90 | av_log(s->avctx, AV_LOG_ERROR, "Bad value for reserved field\n"); | |
91 | if(get_bits(&s->gb, 5) != 1) | |
92 | av_log(s->avctx, AV_LOG_ERROR, "Invalid marker\n"); | |
93 | } | |
94 | if(format == 6){ | |
95 | int ar = get_bits(&s->gb, 4); | |
96 | skip_bits(&s->gb, 9); // display width | |
97 | skip_bits1(&s->gb); | |
98 | skip_bits(&s->gb, 9); // display height | |
99 | if(ar == 15){ | |
100 | s->avctx->sample_aspect_ratio.num = get_bits(&s->gb, 8); // aspect ratio - width | |
101 | s->avctx->sample_aspect_ratio.den = get_bits(&s->gb, 8); // aspect ratio - height | |
102 | } else { | |
103 | s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[ar]; | |
104 | } | |
105 | if (s->avctx->sample_aspect_ratio.num == 0) | |
106 | av_log(s->avctx, AV_LOG_ERROR, "Invalid aspect ratio.\n"); | |
107 | } | |
108 | ||
109 | s->chroma_qscale= s->qscale = get_bits(&s->gb, 5); | |
110 | skip_bits1(&s->gb); /* Continuous Presence Multipoint mode: off */ | |
111 | ||
112 | if(s->pb_frame){ | |
113 | skip_bits(&s->gb, 3); //temporal reference for B-frame | |
114 | skip_bits(&s->gb, 2); //dbquant | |
115 | } | |
116 | ||
117 | /* PEI */ | |
118 | if (skip_1stop_8data_bits(&s->gb) < 0) | |
119 | return AVERROR_INVALIDDATA; | |
120 | s->f_code = 1; | |
121 | ||
122 | s->y_dc_scale_table= | |
123 | s->c_dc_scale_table= ff_mpeg1_dc_scale_table; | |
124 | ||
125 | ff_h263_show_pict_info(s); | |
126 | ||
127 | return 0; | |
128 | } | |
129 | ||
130 | AVCodec ff_h263i_decoder = { | |
131 | .name = "h263i", | |
132 | .long_name = NULL_IF_CONFIG_SMALL("Intel H.263"), | |
133 | .type = AVMEDIA_TYPE_VIDEO, | |
134 | .id = AV_CODEC_ID_H263I, | |
135 | .priv_data_size = sizeof(MpegEncContext), | |
136 | .init = ff_h263_decode_init, | |
137 | .close = ff_h263_decode_end, | |
138 | .decode = ff_h263_decode_frame, | |
139 | .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1, | |
140 | .pix_fmts = (const enum AVPixelFormat[]) { | |
141 | AV_PIX_FMT_YUV420P, | |
142 | AV_PIX_FMT_NONE | |
143 | }, | |
144 | }; |