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/*
* 8088flex TMV video decoder
* Copyright (c) 2009 Daniel Verkamp <daniel at drv.nu>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/** |
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* @file |
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* 8088flex TMV video decoder |
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* @author Daniel Verkamp |
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* @see http://www.oldskool.org/pc/8088_Corruption |
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*/
|
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#include <string.h>
|
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#include "avcodec.h" |
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#include "internal.h" |
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#include "libavutil/internal.h" |
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#include "libavutil/xga_font_data.h" |
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#include "cga_data.h"
static int tmv_decode_frame(AVCodecContext *avctx, void *data, |
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int *got_frame, AVPacket *avpkt) |
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{ |
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AVFrame *frame = data; |
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const uint8_t *src = avpkt->data; |
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uint8_t *dst; |
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unsigned char_cols = avctx->width >> 3;
unsigned char_rows = avctx->height >> 3; |
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unsigned x, y, fg, bg, c; |
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int ret; |
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|
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if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
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return ret; |
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|
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if (avpkt->size < 2*char_rows*char_cols) {
av_log(avctx, AV_LOG_ERROR,
"Input buffer too small, truncated sample?\n"); |
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*got_frame = 0; |
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return AVERROR_INVALIDDATA; |
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}
|
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frame->pict_type = AV_PICTURE_TYPE_I;
frame->key_frame = 1;
dst = frame->data[0]; |
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|
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frame->palette_has_changed = 1;
memcpy(frame->data[1], ff_cga_palette, 16 * 4); |
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memset(frame->data[1] + 16 * 4, 0, AVPALETTE_SIZE - 16 * 4); |
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for (y = 0; y < char_rows; y++) {
for (x = 0; x < char_cols; x++) { |
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c = *src++; |
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bg = *src >> 4;
fg = *src++ & 0xF; |
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ff_draw_pc_font(dst + x * 8, frame->linesize[0], |
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avpriv_cga_font, 8, c, fg, bg); |
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} |
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dst += frame->linesize[0] * 8; |
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}
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*got_frame = 1; |
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|
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return avpkt->size;
}
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static av_cold int tmv_decode_init(AVCodecContext *avctx)
{ |
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avctx->pix_fmt = AV_PIX_FMT_PAL8; |
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return 0;
}
|
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AVCodec ff_tmv_decoder = { |
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.name = "tmv", |
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.long_name = NULL_IF_CONFIG_SMALL("8088flex TMV"), |
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.type = AVMEDIA_TYPE_VIDEO, |
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.id = AV_CODEC_ID_TMV, |
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.init = tmv_decode_init, |
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.decode = tmv_decode_frame, |
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.capabilities = AV_CODEC_CAP_DR1, |
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}; |