mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-27 09:52:17 +00:00
111 lines
3.2 KiB
C
111 lines
3.2 KiB
C
/*
|
|
* 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
|
|
*/
|
|
|
|
/**
|
|
* 8088flex TMV video decoder
|
|
* @file libavcodec/tmv.c
|
|
* @author Daniel Verkamp
|
|
* @sa http://www.oldskool.org/pc/8088_Corruption
|
|
*/
|
|
|
|
#include "avcodec.h"
|
|
|
|
#include "cga_data.h"
|
|
|
|
typedef struct TMVContext {
|
|
AVFrame pic;
|
|
} TMVContext;
|
|
|
|
static int tmv_decode_frame(AVCodecContext *avctx, void *data,
|
|
int *data_size, AVPacket *avpkt)
|
|
{
|
|
TMVContext *tmv = avctx->priv_data;
|
|
const uint8_t *src = avpkt->data;
|
|
uint8_t *dst, *dst_char;
|
|
unsigned char_cols = avctx->width >> 3;
|
|
unsigned char_rows = avctx->height >> 3;
|
|
unsigned x, y, mask, char_y, fg, bg, c;
|
|
|
|
if (tmv->pic.data[0])
|
|
avctx->release_buffer(avctx, &tmv->pic);
|
|
|
|
if (avctx->get_buffer(avctx, &tmv->pic) < 0) {
|
|
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
|
|
return -1;
|
|
}
|
|
|
|
if (avpkt->size < 2*char_rows*char_cols) {
|
|
av_log(avctx, AV_LOG_ERROR,
|
|
"Input buffer too small, truncated sample?\n");
|
|
*data_size = 0;
|
|
return -1;
|
|
}
|
|
|
|
tmv->pic.pict_type = FF_I_TYPE;
|
|
tmv->pic.key_frame = 1;
|
|
dst = tmv->pic.data[0];
|
|
|
|
tmv->pic.palette_has_changed = 1;
|
|
memcpy(tmv->pic.data[1], ff_cga_palette, 16 * 4);
|
|
|
|
for (y = 0; y < char_rows; y++) {
|
|
for (x = 0; x < char_cols; x++) {
|
|
c = *src++ * 8;
|
|
bg = *src >> 4;
|
|
fg = *src++ & 0xF;
|
|
|
|
dst_char = dst + x * 8;
|
|
for (char_y = 0; char_y < 8; char_y++) {
|
|
for (mask = 0x80; mask; mask >>= 1) {
|
|
*dst_char++ = ff_cga_font[c + char_y] & mask ? fg : bg;
|
|
}
|
|
dst_char += tmv->pic.linesize[0] - 8;
|
|
}
|
|
}
|
|
dst += tmv->pic.linesize[0] * 8;
|
|
}
|
|
|
|
*data_size = sizeof(AVFrame);
|
|
*(AVFrame *)data = tmv->pic;
|
|
return avpkt->size;
|
|
}
|
|
|
|
static av_cold int tmv_decode_close(AVCodecContext *avctx)
|
|
{
|
|
TMVContext *tmv = avctx->priv_data;
|
|
|
|
if (tmv->pic.data[0])
|
|
avctx->release_buffer(avctx, &tmv->pic);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec tmv_decoder = {
|
|
.name = "tmv",
|
|
.type = CODEC_TYPE_VIDEO,
|
|
.id = CODEC_ID_TMV,
|
|
.priv_data_size = sizeof(TMVContext),
|
|
.close = tmv_decode_close,
|
|
.decode = tmv_decode_frame,
|
|
.capabilities = CODEC_CAP_DR1,
|
|
.long_name = NULL_IF_CONFIG_SMALL("8088flex TMV"),
|
|
};
|