| Line | Branch | Exec | Source |
|---|---|---|---|
| 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 "codec_internal.h" | ||
| 33 | #include "decode.h" | ||
| 34 | #include "libavutil/internal.h" | ||
| 35 | #include "libavutil/xga_font_data.h" | ||
| 36 | |||
| 37 | #include "cga_data.h" | ||
| 38 | |||
| 39 | 111 | static int tmv_decode_frame(AVCodecContext *avctx, AVFrame *frame, | |
| 40 | int *got_frame, AVPacket *avpkt) | ||
| 41 | { | ||
| 42 | 111 | const uint8_t *src = avpkt->data; | |
| 43 | uint8_t *dst; | ||
| 44 | 111 | unsigned char_cols = avctx->width >> 3; | |
| 45 | 111 | unsigned char_rows = avctx->height >> 3; | |
| 46 | unsigned x, y, fg, bg, c; | ||
| 47 | int ret; | ||
| 48 | |||
| 49 |
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111 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
| 50 | ✗ | return ret; | |
| 51 | |||
| 52 |
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111 | if (avpkt->size < 2*char_rows*char_cols) { |
| 53 | 1 | av_log(avctx, AV_LOG_ERROR, | |
| 54 | "Input buffer too small, truncated sample?\n"); | ||
| 55 | 1 | *got_frame = 0; | |
| 56 | 1 | return AVERROR_INVALIDDATA; | |
| 57 | } | ||
| 58 | |||
| 59 | 110 | frame->pict_type = AV_PICTURE_TYPE_I; | |
| 60 | 110 | frame->flags |= AV_FRAME_FLAG_KEY; | |
| 61 | 110 | dst = frame->data[0]; | |
| 62 | |||
| 63 | #if FF_API_PALETTE_HAS_CHANGED | ||
| 64 | FF_DISABLE_DEPRECATION_WARNINGS | ||
| 65 | 110 | frame->palette_has_changed = 1; | |
| 66 | FF_ENABLE_DEPRECATION_WARNINGS | ||
| 67 | #endif | ||
| 68 | 110 | memcpy(frame->data[1], ff_cga_palette, 16 * 4); | |
| 69 | 110 | memset(frame->data[1] + 16 * 4, 0, AVPALETTE_SIZE - 16 * 4); | |
| 70 | |||
| 71 |
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2860 | for (y = 0; y < char_rows; y++) { |
| 72 |
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112750 | for (x = 0; x < char_cols; x++) { |
| 73 | 110000 | c = *src++; | |
| 74 | 110000 | bg = *src >> 4; | |
| 75 | 110000 | fg = *src++ & 0xF; | |
| 76 | 110000 | ff_draw_pc_font(dst + x * 8, frame->linesize[0], | |
| 77 | avpriv_cga_font, 8, c, fg, bg); | ||
| 78 | } | ||
| 79 | 2750 | dst += frame->linesize[0] * 8; | |
| 80 | } | ||
| 81 | |||
| 82 | 110 | *got_frame = 1; | |
| 83 | |||
| 84 | 110 | return avpkt->size; | |
| 85 | } | ||
| 86 | |||
| 87 | 2 | static av_cold int tmv_decode_init(AVCodecContext *avctx) | |
| 88 | { | ||
| 89 | 2 | avctx->pix_fmt = AV_PIX_FMT_PAL8; | |
| 90 | 2 | return 0; | |
| 91 | } | ||
| 92 | |||
| 93 | const FFCodec ff_tmv_decoder = { | ||
| 94 | .p.name = "tmv", | ||
| 95 | CODEC_LONG_NAME("8088flex TMV"), | ||
| 96 | .p.type = AVMEDIA_TYPE_VIDEO, | ||
| 97 | .p.id = AV_CODEC_ID_TMV, | ||
| 98 | .init = tmv_decode_init, | ||
| 99 | FF_CODEC_DECODE_CB(tmv_decode_frame), | ||
| 100 | .p.capabilities = AV_CODEC_CAP_DR1, | ||
| 101 | }; | ||
| 102 |