LCOV - code coverage report
Current view: top level - libavcodec - tmv.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 28 29 96.6 %
Date: 2017-12-10 21:22:29 Functions: 2 2 100.0 %

          Line data    Source code
       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         111 : static int tmv_decode_frame(AVCodecContext *avctx, void *data,
      39             :                             int *got_frame, AVPacket *avpkt)
      40             : {
      41         111 :     AVFrame *frame     = data;
      42         111 :     const uint8_t *src = avpkt->data;
      43             :     uint8_t *dst;
      44         111 :     unsigned char_cols = avctx->width >> 3;
      45         111 :     unsigned char_rows = avctx->height >> 3;
      46             :     unsigned x, y, fg, bg, c;
      47             :     int ret;
      48             : 
      49         111 :     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
      50           0 :         return ret;
      51             : 
      52         111 :     if (avpkt->size < 2*char_rows*char_cols) {
      53           1 :         av_log(avctx, AV_LOG_ERROR,
      54             :                "Input buffer too small, truncated sample?\n");
      55           1 :         *got_frame = 0;
      56           1 :         return AVERROR_INVALIDDATA;
      57             :     }
      58             : 
      59         110 :     frame->pict_type = AV_PICTURE_TYPE_I;
      60         110 :     frame->key_frame = 1;
      61         110 :     dst              = frame->data[0];
      62             : 
      63         110 :     frame->palette_has_changed = 1;
      64         110 :     memcpy(frame->data[1], ff_cga_palette, 16 * 4);
      65         110 :     memset(frame->data[1] + 16 * 4, 0, AVPALETTE_SIZE - 16 * 4);
      66             : 
      67        2860 :     for (y = 0; y < char_rows; y++) {
      68      112750 :         for (x = 0; x < char_cols; x++) {
      69      110000 :             c  = *src++;
      70      110000 :             bg = *src  >> 4;
      71      110000 :             fg = *src++ & 0xF;
      72      110000 :             ff_draw_pc_font(dst + x * 8, frame->linesize[0],
      73             :                             avpriv_cga_font, 8, c, fg, bg);
      74             :         }
      75        2750 :         dst += frame->linesize[0] * 8;
      76             :     }
      77             : 
      78         110 :     *got_frame = 1;
      79             : 
      80         110 :     return avpkt->size;
      81             : }
      82             : 
      83           2 : static av_cold int tmv_decode_init(AVCodecContext *avctx)
      84             : {
      85           2 :     avctx->pix_fmt = AV_PIX_FMT_PAL8;
      86           2 :     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   = AV_CODEC_CAP_DR1,
      97             : };

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