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
27 #include "libavutil/common.h"
28 #include "libavutil/intreadwrite.h"
32 typedef struct VideoXLContext{
33 AVCodecContext *avctx;
37 static const int xl_table[32] = {
38 0, 1, 2, 3, 4, 5, 6, 7,
39 8, 9, 12, 15, 20, 25, 34, 46,
40 64, 82, 94, 103, 108, 113, 116, 119,
41 120, 121, 122, 123, 124, 125, 126, 127
44 static int decode_frame(AVCodecContext *avctx,
45 void *data, int *got_frame,
48 const uint8_t *buf = avpkt->data;
49 int buf_size = avpkt->size;
50 VideoXLContext * const a = avctx->priv_data;
51 AVFrame * const p = &a->pic;
56 int y0, y1, y2, y3 = 0, c0 = 0, c1 = 0;
58 if (avctx->width & 3) {
59 av_log(avctx, AV_LOG_ERROR, "width is not a multiple of 4\n");
60 return AVERROR_INVALIDDATA;
63 if (buf_size < avctx->width * avctx->height) {
64 av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
65 return AVERROR_INVALIDDATA;
69 avctx->release_buffer(avctx, p);
72 if ((ret = ff_get_buffer(avctx, p)) < 0){
73 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
76 p->pict_type = AV_PICTURE_TYPE_I;
83 stride = avctx->width - 4;
85 for (i = 0; i < avctx->height; i++) {
86 /* lines are stored in reversed order */
89 for (j = 0; j < avctx->width; j += 4) {
90 /* value is stored in LE dword with word swapped */
93 val = ((val >> 16) & 0xFFFF) | ((val & 0xFFFF) << 16);
96 y0 = (val & 0x1F) << 2;
98 y0 = y3 + xl_table[val & 0x1F];
100 y1 = y0 + xl_table[val & 0x1F];
102 y2 = y1 + xl_table[val & 0x1F];
103 val >>= 6; /* align to word */
104 y3 = y2 + xl_table[val & 0x1F];
107 c0 = (val & 0x1F) << 2;
109 c0 += xl_table[val & 0x1F];
112 c1 = (val & 0x1F) << 2;
114 c1 += xl_table[val & 0x1F];
125 buf += avctx->width + 4;
126 Y += a->pic.linesize[0];
127 U += a->pic.linesize[1];
128 V += a->pic.linesize[2];
132 *(AVFrame*)data = a->pic;
137 static av_cold int decode_init(AVCodecContext *avctx)
139 VideoXLContext * const a = avctx->priv_data;
141 avcodec_get_frame_defaults(&a->pic);
142 avctx->pix_fmt = AV_PIX_FMT_YUV411P;
147 static av_cold int decode_end(AVCodecContext *avctx)
149 VideoXLContext * const a = avctx->priv_data;
150 AVFrame *pic = &a->pic;
153 avctx->release_buffer(avctx, pic);
158 AVCodec ff_xl_decoder = {
160 .type = AVMEDIA_TYPE_VIDEO,
161 .id = AV_CODEC_ID_VIXL,
162 .priv_data_size = sizeof(VideoXLContext),
165 .decode = decode_frame,
166 .capabilities = CODEC_CAP_DR1,
167 .long_name = NULL_IF_CONFIG_SMALL("Miro VideoXL"),