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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * 8088flex TMV video decoder |
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| 3 | * Copyright (c) 2009 Daniel Verkamp |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | /** |
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| 23 | * @file |
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| 24 | * 8088flex TMV video decoder |
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| 25 | * @author Daniel Verkamp |
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| 26 | * @see http://www.oldskool.org/pc/8088_Corruption |
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| 27 | */ |
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| 28 | |||
| 29 | #include |
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| 30 | |||
| 31 | #include "avcodec.h" |
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| 32 | #include "internal.h" |
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| 33 | #include "libavutil/internal.h" |
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| 34 | #include "libavutil/xga_font_data.h" |
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| 35 | |||
| 36 | #include "cga_data.h" |
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| 37 | |||
| 38 | static int tmv_decode_frame(AVCodecContext *avctx, void *data, |
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| 39 | int *got_frame, AVPacket *avpkt) |
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| 40 | { |
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| 41 | AVFrame *frame = data; |
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| 42 | const uint8_t *src = avpkt->data; |
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| 43 | uint8_t *dst; |
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| 44 | unsigned char_cols = avctx->width >> 3; |
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| 45 | unsigned char_rows = avctx->height >> 3; |
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| 46 | unsigned x, y, fg, bg, c; |
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| 47 | int ret; |
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| 48 | |||
| 49 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
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| 50 | return ret; |
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| 51 | |||
| 52 | if (avpkt->size < 2*char_rows*char_cols) { |
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| 53 | av_log(avctx, AV_LOG_ERROR, |
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| 54 | "Input buffer too small, truncated sample?\n"); |
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| 55 | *got_frame = 0; |
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| 56 | return AVERROR_INVALIDDATA; |
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| 57 | } |
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| 58 | |||
| 59 | frame->pict_type = AV_PICTURE_TYPE_I; |
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| 60 | frame->key_frame = 1; |
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| 61 | dst = frame->data[0]; |
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| 62 | |||
| 63 | frame->palette_has_changed = 1; |
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| 64 | memcpy(frame->data[1], ff_cga_palette, 16 * 4); |
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| 65 | memset(frame->data[1] + 16 * 4, 0, AVPALETTE_SIZE - 16 * 4); |
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| 66 | |||
| 67 | for (y = 0; y < char_rows; y++) { |
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| 68 | for (x = 0; x < char_cols; x++) { |
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| 69 | c = *src++; |
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| 70 | bg = *src >> 4; |
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| 71 | fg = *src++ & 0xF; |
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| 72 | ff_draw_pc_font(dst + x * 8, frame->linesize[0], |
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| 73 | avpriv_cga_font, 8, c, fg, bg); |
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| 74 | } |
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| 75 | dst += frame->linesize[0] * 8; |
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| 76 | } |
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| 77 | |||
| 78 | *got_frame = 1; |
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| 79 | |||
| 80 | return avpkt->size; |
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| 81 | } |
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| 82 | |||
| 83 | static av_cold int tmv_decode_init(AVCodecContext *avctx) |
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| 84 | { |
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| 85 | avctx->pix_fmt = AV_PIX_FMT_PAL8; |
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| 86 | return 0; |
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| 87 | } |
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| 88 | |||
| 89 | AVCodec ff_tmv_decoder = { |
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| 90 | .name = "tmv", |
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| 91 | .long_name = NULL_IF_CONFIG_SMALL("8088flex TMV"), |
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| 92 | .type = AVMEDIA_TYPE_VIDEO, |
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| 93 | .id = AV_CODEC_ID_TMV, |
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| 94 | .init = tmv_decode_init, |
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| 95 | .decode = tmv_decode_frame, |
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| 96 | .capabilities = CODEC_CAP_DR1, |
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| 97 | }; |