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  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 "internal.h"
  33. #include "libavutil/internal.h"
  34. #include "libavutil/xga_font_data.h"
  35.  
  36. #include "cga_data.h"
  37.  
  38. static int tmv_decode_frame(AVCodecContext *avctx, void *data,
  39.                             int *got_frame, AVPacket *avpkt)
  40. {
  41.     AVFrame *frame     = data;
  42.     const uint8_t *src = avpkt->data;
  43.     uint8_t *dst;
  44.     unsigned char_cols = avctx->width >> 3;
  45.     unsigned char_rows = avctx->height >> 3;
  46.     unsigned x, y, fg, bg, c;
  47.     int ret;
  48.  
  49.     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
  50.         return ret;
  51.  
  52.     if (avpkt->size < 2*char_rows*char_cols) {
  53.         av_log(avctx, AV_LOG_ERROR,
  54.                "Input buffer too small, truncated sample?\n");
  55.         *got_frame = 0;
  56.         return AVERROR_INVALIDDATA;
  57.     }
  58.  
  59.     frame->pict_type = AV_PICTURE_TYPE_I;
  60.     frame->key_frame = 1;
  61.     dst              = frame->data[0];
  62.  
  63.     frame->palette_has_changed = 1;
  64.     memcpy(frame->data[1], ff_cga_palette, 16 * 4);
  65.     memset(frame->data[1] + 16 * 4, 0, AVPALETTE_SIZE - 16 * 4);
  66.  
  67.     for (y = 0; y < char_rows; y++) {
  68.         for (x = 0; x < char_cols; x++) {
  69.             c  = *src++;
  70.             bg = *src  >> 4;
  71.             fg = *src++ & 0xF;
  72.             ff_draw_pc_font(dst + x * 8, frame->linesize[0],
  73.                             avpriv_cga_font, 8, c, fg, bg);
  74.         }
  75.         dst += frame->linesize[0] * 8;
  76.     }
  77.  
  78.     *got_frame = 1;
  79.  
  80.     return avpkt->size;
  81. }
  82.  
  83. static av_cold int tmv_decode_init(AVCodecContext *avctx)
  84. {
  85.     avctx->pix_fmt = AV_PIX_FMT_PAL8;
  86.     return 0;
  87. }
  88.  
  89. AVCodec ff_tmv_decoder = {
  90.     .name           = "tmv",
  91.     .long_name      = NULL_IF_CONFIG_SMALL("8088flex TMV"),
  92.     .type           = AVMEDIA_TYPE_VIDEO,
  93.     .id             = AV_CODEC_ID_TMV,
  94.     .init           = tmv_decode_init,
  95.     .decode         = tmv_decode_frame,
  96.     .capabilities   = CODEC_CAP_DR1,
  97. };
  98.