3 * Copyright (c) 2004 Konstantin Shishkov
5 * This file is part of FFmpeg.
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.
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.
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
28 #include "mpegvideo.h"
30 typedef struct VideoXLContext{
31 AVCodecContext *avctx;
35 static const int xl_table[32] = {
36 0, 1, 2, 3, 4, 5, 6, 7,
37 8, 9, 12, 15, 20, 25, 34, 46,
38 64, 82, 94, 103, 108, 113, 116, 119,
39 120, 121, 122, 123, 124, 125, 126, 127};
41 static int decode_frame(AVCodecContext *avctx,
42 void *data, int *data_size,
43 uint8_t *buf, int buf_size)
45 VideoXLContext * const a = avctx->priv_data;
46 AVFrame * const p= (AVFrame*)&a->pic;
51 int y0, y1, y2, y3, c0, c1;
54 avctx->release_buffer(avctx, p);
57 if(avctx->get_buffer(avctx, p) < 0){
58 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
68 stride = avctx->width - 4;
69 for (i = 0; i < avctx->height; i++) {
70 /* lines are stored in reversed order */
73 for (j = 0; j < avctx->width; j += 4) {
74 /* value is stored in LE dword with word swapped */
77 val = ((val >> 16) & 0xFFFF) | ((val & 0xFFFF) << 16);
80 y0 = (val & 0x1F) << 2;
82 y0 = y3 + xl_table[val & 0x1F];
84 y1 = y0 + xl_table[val & 0x1F];
86 y2 = y1 + xl_table[val & 0x1F];
87 val >>= 6; /* align to word */
88 y3 = y2 + xl_table[val & 0x1F];
91 c0 = (val & 0x1F) << 2;
93 c0 += xl_table[val & 0x1F];
96 c1 = (val & 0x1F) << 2;
98 c1 += xl_table[val & 0x1F];
109 buf += avctx->width + 4;
110 Y += a->pic.linesize[0];
111 U += a->pic.linesize[1];
112 V += a->pic.linesize[2];
115 *data_size = sizeof(AVFrame);
116 *(AVFrame*)data = a->pic;
121 static int decode_init(AVCodecContext *avctx){
122 // VideoXLContext * const a = avctx->priv_data;
124 avctx->pix_fmt= PIX_FMT_YUV411P;
129 AVCodec xl_decoder = {
133 sizeof(VideoXLContext),