/* * 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 */ /** * @file * 8088flex TMV video decoder * @author Daniel Verkamp * @see http://www.oldskool.org/pc/8088_Corruption */ #include <string.h> #include "avcodec.h" #include "internal.h" #include "libavutil/internal.h" #include "libavutil/xga_font_data.h" #include "cga_data.h" static int tmv_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt) { AVFrame *frame = data; const uint8_t *src = avpkt->data; uint8_t *dst; unsigned char_cols = avctx->width >> 3; unsigned char_rows = avctx->height >> 3; unsigned x, y, fg, bg, c; int ret; if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) return ret; if (avpkt->size < 2*char_rows*char_cols) { av_log(avctx, AV_LOG_ERROR, "Input buffer too small, truncated sample?\n"); *got_frame = 0; return AVERROR_INVALIDDATA; } frame->pict_type = AV_PICTURE_TYPE_I; frame->key_frame = 1; dst = frame->data[0]; frame->palette_has_changed = 1; memcpy(frame->data[1], ff_cga_palette, 16 * 4); memset(frame->data[1] + 16 * 4, 0, AVPALETTE_SIZE - 16 * 4); for (y = 0; y < char_rows; y++) { for (x = 0; x < char_cols; x++) { c = *src++; bg = *src >> 4; fg = *src++ & 0xF; ff_draw_pc_font(dst + x * 8, frame->linesize[0], avpriv_cga_font, 8, c, fg, bg); } dst += frame->linesize[0] * 8; } *got_frame = 1; return avpkt->size; } static av_cold int tmv_decode_init(AVCodecContext *avctx) { avctx->pix_fmt = AV_PIX_FMT_PAL8; return 0; } AVCodec ff_tmv_decoder = { .name = "tmv", .long_name = NULL_IF_CONFIG_SMALL("8088flex TMV"), .type = AVMEDIA_TYPE_VIDEO, .id = AV_CODEC_ID_TMV, .init = tmv_decode_init, .decode = tmv_decode_frame, .capabilities = CODEC_CAP_DR1, };