| /* |
| * 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 |
| * @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 av_cold int tmv_decode_init(AVCodecContext *avctx) |
| { |
| TMVContext *tmv = avctx->priv_data; |
| |
| avcodec_get_frame_defaults(&tmv->pic); |
| return 0; |
| } |
| |
| 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; |
| unsigned char_cols = avctx->width >> 3; |
| unsigned char_rows = avctx->height >> 3; |
| unsigned x, 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 = AV_PICTURE_TYPE_I; |
| 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++; |
| bg = *src >> 4; |
| fg = *src++ & 0xF; |
| ff_draw_pc_font(dst + x * 8, tmv->pic.linesize[0], |
| ff_cga_font, 8, c, fg, bg); |
| } |
| 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 ff_tmv_decoder = { |
| .name = "tmv", |
| .type = AVMEDIA_TYPE_VIDEO, |
| .id = CODEC_ID_TMV, |
| .priv_data_size = sizeof(TMVContext), |
| .init = tmv_decode_init, |
| .close = tmv_decode_close, |
| .decode = tmv_decode_frame, |
| .capabilities = CODEC_CAP_DR1, |
| .long_name = NULL_IF_CONFIG_SMALL("8088flex TMV"), |
| }; |