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/* |
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* 8088flex TMV video decoder |
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* Copyright (c) 2009 Daniel Verkamp <daniel at drv.nu> |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/** |
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* @file |
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* 8088flex TMV video decoder |
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* @author Daniel Verkamp |
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* @see http://www.oldskool.org/pc/8088_Corruption |
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*/ |
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#include <string.h> |
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#include "avcodec.h" |
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#include "internal.h" |
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#include "libavutil/internal.h" |
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#include "libavutil/xga_font_data.h" |
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#include "cga_data.h" |
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static int tmv_decode_frame(AVCodecContext *avctx, void *data, |
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int *got_frame, AVPacket *avpkt) |
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{ |
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AVFrame *frame = data; |
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const uint8_t *src = avpkt->data; |
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uint8_t *dst; |
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unsigned char_cols = avctx->width >> 3; |
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unsigned char_rows = avctx->height >> 3; |
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unsigned x, y, fg, bg, c; |
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int ret; |
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✗✓ |
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if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
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return ret; |
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✓✓ |
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if (avpkt->size < 2*char_rows*char_cols) { |
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av_log(avctx, AV_LOG_ERROR, |
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"Input buffer too small, truncated sample?\n"); |
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*got_frame = 0; |
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return AVERROR_INVALIDDATA; |
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} |
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frame->pict_type = AV_PICTURE_TYPE_I; |
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frame->key_frame = 1; |
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dst = frame->data[0]; |
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frame->palette_has_changed = 1; |
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memcpy(frame->data[1], ff_cga_palette, 16 * 4); |
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memset(frame->data[1] + 16 * 4, 0, AVPALETTE_SIZE - 16 * 4); |
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✓✓ |
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for (y = 0; y < char_rows; y++) { |
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✓✓ |
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for (x = 0; x < char_cols; x++) { |
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c = *src++; |
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bg = *src >> 4; |
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fg = *src++ & 0xF; |
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ff_draw_pc_font(dst + x * 8, frame->linesize[0], |
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avpriv_cga_font, 8, c, fg, bg); |
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} |
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dst += frame->linesize[0] * 8; |
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} |
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*got_frame = 1; |
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return avpkt->size; |
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} |
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static av_cold int tmv_decode_init(AVCodecContext *avctx) |
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{ |
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avctx->pix_fmt = AV_PIX_FMT_PAL8; |
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return 0; |
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} |
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AVCodec ff_tmv_decoder = { |
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.name = "tmv", |
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.long_name = NULL_IF_CONFIG_SMALL("8088flex TMV"), |
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.type = AVMEDIA_TYPE_VIDEO, |
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.id = AV_CODEC_ID_TMV, |
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.init = tmv_decode_init, |
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.decode = tmv_decode_frame, |
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.capabilities = AV_CODEC_CAP_DR1, |
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}; |