/* * 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 */ /** * 8088flex TMV video decoder * @file libavcodec/tmv.c * @author Daniel Verkamp * @sa http://www.oldskool.org/pc/8088_Corruption */ #include "avcodec.h" #include "cga_data.h" typedef struct TMVContext { AVFrame pic; } TMVContext; static int tmv_decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt) { TMVContext *tmv = avctx->priv_data; const uint8_t *src = avpkt->data; uint8_t *dst, *dst_char; unsigned char_cols = avctx->width >> 3; unsigned char_rows = avctx->height >> 3; unsigned x, y, mask, char_y, fg, bg, c; if (tmv->pic.data[0]) avctx->release_buffer(avctx, &tmv->pic); if (avctx->get_buffer(avctx, &tmv->pic) < 0) { av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); return -1; } if (avpkt->size < 2*char_rows*char_cols) { av_log(avctx, AV_LOG_ERROR, "Input buffer too small, truncated sample?\n"); *data_size = 0; return -1; } tmv->pic.pict_type = FF_I_TYPE; tmv->pic.key_frame = 1; dst = tmv->pic.data[0]; tmv->pic.palette_has_changed = 1; memcpy(tmv->pic.data[1], ff_cga_palette, 16 * 4); for (y = 0; y < char_rows; y++) { for (x = 0; x < char_cols; x++) { c = *src++ * 8; bg = *src >> 4; fg = *src++ & 0xF; dst_char = dst + x * 8; for (char_y = 0; char_y < 8; char_y++) { for (mask = 0x80; mask; mask >>= 1) { *dst_char++ = ff_cga_font[c + char_y] & mask ? fg : bg; } dst_char += tmv->pic.linesize[0] - 8; } } dst += tmv->pic.linesize[0] * 8; } *data_size = sizeof(AVFrame); *(AVFrame *)data = tmv->pic; return avpkt->size; } static av_cold int tmv_decode_close(AVCodecContext *avctx) { TMVContext *tmv = avctx->priv_data; if (tmv->pic.data[0]) avctx->release_buffer(avctx, &tmv->pic); return 0; } AVCodec tmv_decoder = { .name = "tmv", .type = CODEC_TYPE_VIDEO, .id = CODEC_ID_TMV, .priv_data_size = sizeof(TMVContext), .close = tmv_decode_close, .decode = tmv_decode_frame, .capabilities = CODEC_CAP_DR1, .long_name = NULL_IF_CONFIG_SMALL("8088flex TMV"), };