yading@10: /*
yading@10:  * 8088flex TMV video decoder
yading@10:  * Copyright (c) 2009 Daniel Verkamp <daniel at drv.nu>
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * 8088flex TMV video decoder
yading@10:  * @author Daniel Verkamp
yading@10:  * @see http://www.oldskool.org/pc/8088_Corruption
yading@10:  */
yading@10: 
yading@10: #include <string.h>
yading@10: 
yading@10: #include "avcodec.h"
yading@10: #include "internal.h"
yading@10: #include "libavutil/internal.h"
yading@10: #include "libavutil/xga_font_data.h"
yading@10: 
yading@10: #include "cga_data.h"
yading@10: 
yading@10: static int tmv_decode_frame(AVCodecContext *avctx, void *data,
yading@10:                             int *got_frame, AVPacket *avpkt)
yading@10: {
yading@10:     AVFrame *frame     = data;
yading@10:     const uint8_t *src = avpkt->data;
yading@10:     uint8_t *dst;
yading@10:     unsigned char_cols = avctx->width >> 3;
yading@10:     unsigned char_rows = avctx->height >> 3;
yading@10:     unsigned x, y, fg, bg, c;
yading@10:     int ret;
yading@10: 
yading@10:     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     if (avpkt->size < 2*char_rows*char_cols) {
yading@10:         av_log(avctx, AV_LOG_ERROR,
yading@10:                "Input buffer too small, truncated sample?\n");
yading@10:         *got_frame = 0;
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     frame->pict_type = AV_PICTURE_TYPE_I;
yading@10:     frame->key_frame = 1;
yading@10:     dst              = frame->data[0];
yading@10: 
yading@10:     frame->palette_has_changed = 1;
yading@10:     memcpy(frame->data[1], ff_cga_palette, 16 * 4);
yading@10:     memset(frame->data[1] + 16 * 4, 0, AVPALETTE_SIZE - 16 * 4);
yading@10: 
yading@10:     for (y = 0; y < char_rows; y++) {
yading@10:         for (x = 0; x < char_cols; x++) {
yading@10:             c  = *src++;
yading@10:             bg = *src  >> 4;
yading@10:             fg = *src++ & 0xF;
yading@10:             ff_draw_pc_font(dst + x * 8, frame->linesize[0],
yading@10:                             avpriv_cga_font, 8, c, fg, bg);
yading@10:         }
yading@10:         dst += frame->linesize[0] * 8;
yading@10:     }
yading@10: 
yading@10:     *got_frame = 1;
yading@10: 
yading@10:     return avpkt->size;
yading@10: }
yading@10: 
yading@10: static av_cold int tmv_decode_init(AVCodecContext *avctx)
yading@10: {
yading@10:     avctx->pix_fmt = AV_PIX_FMT_PAL8;
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: AVCodec ff_tmv_decoder = {
yading@10:     .name           = "tmv",
yading@10:     .type           = AVMEDIA_TYPE_VIDEO,
yading@10:     .id             = AV_CODEC_ID_TMV,
yading@10:     .init           = tmv_decode_init,
yading@10:     .decode         = tmv_decode_frame,
yading@10:     .capabilities   = CODEC_CAP_DR1,
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("8088flex TMV"),
yading@10: };