mpegvideo: Move tables to a separate file
[libav.git] / libavcodec / flvdec.c
1 /*
2 * FLV decoding.
3 *
4 * This file is part of Libav.
5 *
6 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #include "libavutil/imgutils.h"
22
23 #include "flv.h"
24 #include "h263.h"
25 #include "mpegvideo.h"
26 #include "mpegvideodata.h"
27
28 void ff_flv2_decode_ac_esc(GetBitContext *gb, int *level, int *run, int *last)
29 {
30 int is11 = get_bits1(gb);
31 *last = get_bits1(gb);
32 *run = get_bits(gb, 6);
33 if (is11)
34 *level = get_sbits(gb, 11);
35 else
36 *level = get_sbits(gb, 7);
37 }
38
39 int ff_flv_decode_picture_header(MpegEncContext *s)
40 {
41 int format, width, height;
42
43 /* picture header */
44 if (get_bits_long(&s->gb, 17) != 1) {
45 av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n");
46 return -1;
47 }
48 format = get_bits(&s->gb, 5);
49 if (format != 0 && format != 1) {
50 av_log(s->avctx, AV_LOG_ERROR, "Bad picture format\n");
51 return -1;
52 }
53 s->h263_flv = format + 1;
54 s->picture_number = get_bits(&s->gb, 8); /* picture timestamp */
55 format = get_bits(&s->gb, 3);
56 switch (format) {
57 case 0:
58 width = get_bits(&s->gb, 8);
59 height = get_bits(&s->gb, 8);
60 break;
61 case 1:
62 width = get_bits(&s->gb, 16);
63 height = get_bits(&s->gb, 16);
64 break;
65 case 2:
66 width = 352;
67 height = 288;
68 break;
69 case 3:
70 width = 176;
71 height = 144;
72 break;
73 case 4:
74 width = 128;
75 height = 96;
76 break;
77 case 5:
78 width = 320;
79 height = 240;
80 break;
81 case 6:
82 width = 160;
83 height = 120;
84 break;
85 default:
86 width = height = 0;
87 break;
88 }
89 if (av_image_check_size(width, height, 0, s->avctx))
90 return -1;
91 s->width = width;
92 s->height = height;
93
94 s->pict_type = AV_PICTURE_TYPE_I + get_bits(&s->gb, 2);
95 s->droppable = s->pict_type > AV_PICTURE_TYPE_P;
96 if (s->droppable)
97 s->pict_type = AV_PICTURE_TYPE_P;
98
99 skip_bits1(&s->gb); /* deblocking flag */
100 s->chroma_qscale = s->qscale = get_bits(&s->gb, 5);
101
102 s->h263_plus = 0;
103
104 s->unrestricted_mv = 1;
105 s->h263_long_vectors = 0;
106
107 /* PEI */
108 while (get_bits1(&s->gb) != 0)
109 skip_bits(&s->gb, 8);
110 s->f_code = 1;
111
112 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
113 av_log(s->avctx, AV_LOG_DEBUG, "%c esc_type:%d, qp:%d num:%d\n",
114 s->droppable ? 'D' : av_get_picture_type_char(s->pict_type),
115 s->h263_flv - 1, s->qscale, s->picture_number);
116 }
117
118 s->y_dc_scale_table = s->c_dc_scale_table = ff_mpeg1_dc_scale_table;
119
120 return 0;
121 }
122
123 AVCodec ff_flv_decoder = {
124 .name = "flv",
125 .long_name = NULL_IF_CONFIG_SMALL("FLV / Sorenson Spark / Sorenson H.263 (Flash Video)"),
126 .type = AVMEDIA_TYPE_VIDEO,
127 .id = AV_CODEC_ID_FLV1,
128 .priv_data_size = sizeof(MpegEncContext),
129 .init = ff_h263_decode_init,
130 .close = ff_h263_decode_end,
131 .decode = ff_h263_decode_frame,
132 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
133 .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
134 AV_PIX_FMT_NONE },
135 };