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 static const int xl_table
[32] = {
33 0, 1, 2, 3, 4, 5, 6, 7,
34 8, 9, 12, 15, 20, 25, 34, 46,
35 64, 82, 94, 103, 108, 113, 116, 119,
36 120, 121, 122, 123, 124, 125, 126, 127
39 static int decode_frame(AVCodecContext
*avctx
,
40 void *data
, int *got_frame
,
43 const uint8_t *buf
= avpkt
->data
;
44 int buf_size
= avpkt
->size
;
45 AVFrame
*const p
= data
;
50 int y0
, y1
, y2
, y3
= 0, c0
= 0, c1
= 0;
52 if (avctx
->width
% 4) {
53 av_log(avctx
, AV_LOG_ERROR
, "width is not a multiple of 4\n");
54 return AVERROR_INVALIDDATA
;
56 if (buf_size
< avctx
->width
* avctx
->height
) {
57 av_log(avctx
, AV_LOG_ERROR
, "Packet is too small\n");
58 return AVERROR_INVALIDDATA
;
61 if ((ret
= ff_get_buffer(avctx
, p
, 0)) < 0)
63 p
->pict_type
= AV_PICTURE_TYPE_I
;
70 stride
= avctx
->width
- 4;
72 for (i
= 0; i
< avctx
->height
; i
++) {
73 /* lines are stored in reversed order */
76 for (j
= 0; j
< avctx
->width
; j
+= 4) {
77 /* value is stored in LE dword with word swapped */
80 val
= ((val
>> 16) & 0xFFFF) | ((val
& 0xFFFF) << 16);
83 y0
= (val
& 0x1F) << 2;
85 y0
= y3
+ xl_table
[val
& 0x1F];
87 y1
= y0
+ xl_table
[val
& 0x1F];
89 y2
= y1
+ xl_table
[val
& 0x1F];
90 val
>>= 6; /* align to word */
91 y3
= y2
+ xl_table
[val
& 0x1F];
94 c0
= (val
& 0x1F) << 2;
96 c0
+= xl_table
[val
& 0x1F];
99 c1
= (val
& 0x1F) << 2;
101 c1
+= xl_table
[val
& 0x1F];
112 buf
+= avctx
->width
+ 4;
123 static av_cold
int decode_init(AVCodecContext
*avctx
)
125 avctx
->pix_fmt
= AV_PIX_FMT_YUV411P
;
130 AVCodec ff_xl_decoder
= {
132 .long_name
= NULL_IF_CONFIG_SMALL("Miro VideoXL"),
133 .type
= AVMEDIA_TYPE_VIDEO
,
134 .id
= AV_CODEC_ID_VIXL
,
136 .decode
= decode_frame
,
137 .capabilities
= CODEC_CAP_DR1
,