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2ba45a60 DM |
1 | /* |
2 | * FLV decoding. | |
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 "libavutil/imgutils.h" | |
22 | ||
23 | #include "flv.h" | |
24 | #include "h263.h" | |
25 | #include "mpegvideo.h" | |
26 | ||
27 | int ff_flv_decode_picture_header(MpegEncContext *s) | |
28 | { | |
29 | int format, width, height; | |
30 | ||
31 | /* picture header */ | |
32 | if (get_bits_long(&s->gb, 17) != 1) { | |
33 | av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n"); | |
34 | return AVERROR_INVALIDDATA; | |
35 | } | |
36 | format = get_bits(&s->gb, 5); | |
37 | if (format != 0 && format != 1) { | |
38 | av_log(s->avctx, AV_LOG_ERROR, "Bad picture format\n"); | |
39 | return AVERROR_INVALIDDATA; | |
40 | } | |
41 | s->h263_flv = format + 1; | |
42 | s->picture_number = get_bits(&s->gb, 8); /* picture timestamp */ | |
43 | format = get_bits(&s->gb, 3); | |
44 | switch (format) { | |
45 | case 0: | |
46 | width = get_bits(&s->gb, 8); | |
47 | height = get_bits(&s->gb, 8); | |
48 | break; | |
49 | case 1: | |
50 | width = get_bits(&s->gb, 16); | |
51 | height = get_bits(&s->gb, 16); | |
52 | break; | |
53 | case 2: | |
54 | width = 352; | |
55 | height = 288; | |
56 | break; | |
57 | case 3: | |
58 | width = 176; | |
59 | height = 144; | |
60 | break; | |
61 | case 4: | |
62 | width = 128; | |
63 | height = 96; | |
64 | break; | |
65 | case 5: | |
66 | width = 320; | |
67 | height = 240; | |
68 | break; | |
69 | case 6: | |
70 | width = 160; | |
71 | height = 120; | |
72 | break; | |
73 | default: | |
74 | width = height = 0; | |
75 | break; | |
76 | } | |
77 | if (av_image_check_size(width, height, 0, s->avctx)) | |
78 | return AVERROR(EINVAL); | |
79 | s->width = width; | |
80 | s->height = height; | |
81 | ||
82 | s->pict_type = AV_PICTURE_TYPE_I + get_bits(&s->gb, 2); | |
83 | s->droppable = s->pict_type > AV_PICTURE_TYPE_P; | |
84 | if (s->droppable) | |
85 | s->pict_type = AV_PICTURE_TYPE_P; | |
86 | ||
87 | skip_bits1(&s->gb); /* deblocking flag */ | |
88 | s->chroma_qscale = s->qscale = get_bits(&s->gb, 5); | |
89 | ||
90 | s->h263_plus = 0; | |
91 | ||
92 | s->unrestricted_mv = 1; | |
93 | s->h263_long_vectors = 0; | |
94 | ||
95 | /* PEI */ | |
96 | if (skip_1stop_8data_bits(&s->gb) < 0) | |
97 | return AVERROR_INVALIDDATA; | |
98 | ||
99 | s->f_code = 1; | |
100 | ||
101 | if (s->ehc_mode) | |
102 | s->avctx->sample_aspect_ratio= (AVRational){1,2}; | |
103 | ||
104 | if (s->avctx->debug & FF_DEBUG_PICT_INFO) { | |
105 | av_log(s->avctx, AV_LOG_DEBUG, "%c esc_type:%d, qp:%d num:%d\n", | |
106 | s->droppable ? 'D' : av_get_picture_type_char(s->pict_type), | |
107 | s->h263_flv - 1, s->qscale, s->picture_number); | |
108 | } | |
109 | ||
110 | s->y_dc_scale_table = s->c_dc_scale_table = ff_mpeg1_dc_scale_table; | |
111 | ||
112 | return 0; | |
113 | } | |
114 | ||
115 | AVCodec ff_flv_decoder = { | |
116 | .name = "flv", | |
117 | .long_name = NULL_IF_CONFIG_SMALL("FLV / Sorenson Spark / Sorenson H.263 (Flash Video)"), | |
118 | .type = AVMEDIA_TYPE_VIDEO, | |
119 | .id = AV_CODEC_ID_FLV1, | |
120 | .priv_data_size = sizeof(MpegEncContext), | |
121 | .init = ff_h263_decode_init, | |
122 | .close = ff_h263_decode_end, | |
123 | .decode = ff_h263_decode_frame, | |
124 | .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1, | |
125 | .max_lowres = 3, | |
126 | .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P, | |
127 | AV_PIX_FMT_NONE }, | |
128 | }; |