0,0 → 1,97 |
/* |
* 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 |
*/ |
|
/** |
* @file |
* 8088flex TMV video decoder |
* @author Daniel Verkamp |
* @see http://www.oldskool.org/pc/8088_Corruption |
*/ |
|
#include <string.h> |
|
#include "avcodec.h" |
#include "internal.h" |
#include "libavutil/internal.h" |
#include "libavutil/xga_font_data.h" |
|
#include "cga_data.h" |
|
static int tmv_decode_frame(AVCodecContext *avctx, void *data, |
int *got_frame, AVPacket *avpkt) |
{ |
AVFrame *frame = data; |
const uint8_t *src = avpkt->data; |
uint8_t *dst; |
unsigned char_cols = avctx->width >> 3; |
unsigned char_rows = avctx->height >> 3; |
unsigned x, y, fg, bg, c; |
int ret; |
|
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
return ret; |
|
if (avpkt->size < 2*char_rows*char_cols) { |
av_log(avctx, AV_LOG_ERROR, |
"Input buffer too small, truncated sample?\n"); |
*got_frame = 0; |
return AVERROR_INVALIDDATA; |
} |
|
frame->pict_type = AV_PICTURE_TYPE_I; |
frame->key_frame = 1; |
dst = frame->data[0]; |
|
frame->palette_has_changed = 1; |
memcpy(frame->data[1], ff_cga_palette, 16 * 4); |
memset(frame->data[1] + 16 * 4, 0, AVPALETTE_SIZE - 16 * 4); |
|
for (y = 0; y < char_rows; y++) { |
for (x = 0; x < char_cols; x++) { |
c = *src++; |
bg = *src >> 4; |
fg = *src++ & 0xF; |
ff_draw_pc_font(dst + x * 8, frame->linesize[0], |
avpriv_cga_font, 8, c, fg, bg); |
} |
dst += frame->linesize[0] * 8; |
} |
|
*got_frame = 1; |
|
return avpkt->size; |
} |
|
static av_cold int tmv_decode_init(AVCodecContext *avctx) |
{ |
avctx->pix_fmt = AV_PIX_FMT_PAL8; |
return 0; |
} |
|
AVCodec ff_tmv_decoder = { |
.name = "tmv", |
.long_name = NULL_IF_CONFIG_SMALL("8088flex TMV"), |
.type = AVMEDIA_TYPE_VIDEO, |
.id = AV_CODEC_ID_TMV, |
.init = tmv_decode_init, |
.decode = tmv_decode_frame, |
.capabilities = CODEC_CAP_DR1, |
}; |