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2ba45a60 DM |
1 | /* |
2 | * 8088flex TMV video decoder | |
3 | * Copyright (c) 2009 Daniel Verkamp <daniel at drv.nu> | |
4 | * | |
5 | * This file is part of FFmpeg. | |
6 | * | |
7 | * FFmpeg is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU Lesser General Public | |
9 | * License as published by the Free Software Foundation; either | |
10 | * version 2.1 of the License, or (at your option) any later version. | |
11 | * | |
12 | * FFmpeg is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * Lesser General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU Lesser General Public | |
18 | * License along with FFmpeg; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | */ | |
21 | ||
22 | /** | |
23 | * @file | |
24 | * 8088flex TMV video decoder | |
25 | * @author Daniel Verkamp | |
26 | * @see http://www.oldskool.org/pc/8088_Corruption | |
27 | */ | |
28 | ||
29 | #include <string.h> | |
30 | ||
31 | #include "avcodec.h" | |
32 | #include "internal.h" | |
33 | #include "libavutil/internal.h" | |
34 | #include "libavutil/xga_font_data.h" | |
35 | ||
36 | #include "cga_data.h" | |
37 | ||
38 | static int tmv_decode_frame(AVCodecContext *avctx, void *data, | |
39 | int *got_frame, AVPacket *avpkt) | |
40 | { | |
41 | AVFrame *frame = data; | |
42 | const uint8_t *src = avpkt->data; | |
43 | uint8_t *dst; | |
44 | unsigned char_cols = avctx->width >> 3; | |
45 | unsigned char_rows = avctx->height >> 3; | |
46 | unsigned x, y, fg, bg, c; | |
47 | int ret; | |
48 | ||
49 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) | |
50 | return ret; | |
51 | ||
52 | if (avpkt->size < 2*char_rows*char_cols) { | |
53 | av_log(avctx, AV_LOG_ERROR, | |
54 | "Input buffer too small, truncated sample?\n"); | |
55 | *got_frame = 0; | |
56 | return AVERROR_INVALIDDATA; | |
57 | } | |
58 | ||
59 | frame->pict_type = AV_PICTURE_TYPE_I; | |
60 | frame->key_frame = 1; | |
61 | dst = frame->data[0]; | |
62 | ||
63 | frame->palette_has_changed = 1; | |
64 | memcpy(frame->data[1], ff_cga_palette, 16 * 4); | |
65 | memset(frame->data[1] + 16 * 4, 0, AVPALETTE_SIZE - 16 * 4); | |
66 | ||
67 | for (y = 0; y < char_rows; y++) { | |
68 | for (x = 0; x < char_cols; x++) { | |
69 | c = *src++; | |
70 | bg = *src >> 4; | |
71 | fg = *src++ & 0xF; | |
72 | ff_draw_pc_font(dst + x * 8, frame->linesize[0], | |
73 | avpriv_cga_font, 8, c, fg, bg); | |
74 | } | |
75 | dst += frame->linesize[0] * 8; | |
76 | } | |
77 | ||
78 | *got_frame = 1; | |
79 | ||
80 | return avpkt->size; | |
81 | } | |
82 | ||
83 | static av_cold int tmv_decode_init(AVCodecContext *avctx) | |
84 | { | |
85 | avctx->pix_fmt = AV_PIX_FMT_PAL8; | |
86 | return 0; | |
87 | } | |
88 | ||
89 | AVCodec ff_tmv_decoder = { | |
90 | .name = "tmv", | |
91 | .long_name = NULL_IF_CONFIG_SMALL("8088flex TMV"), | |
92 | .type = AVMEDIA_TYPE_VIDEO, | |
93 | .id = AV_CODEC_ID_TMV, | |
94 | .init = tmv_decode_init, | |
95 | .decode = tmv_decode_frame, | |
96 | .capabilities = CODEC_CAP_DR1, | |
97 | }; |