1 /*
2 * Miro VideoXL codec
3 * Copyright (c) 2004 Konstantin Shishkov
4 *
5 * This file is part of FFmpeg.
6 *
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.
11 *
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.
16 *
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
20 */
21
22 /**
23 * @file
24 * Miro VideoXL codec.
25 */
26
31
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
37 };
38
40 void *
data,
int *got_frame,
42 {
44 int buf_size = avpkt->
size;
47 int i, j, ret;
50 int y0, y1, y2, y3 = 0, c0 = 0,
c1 = 0;
51
52 if (avctx->
width % 4) {
55 }
59 }
60
62 return ret;
65
69
70 stride = avctx->
width - 4;
71
72 for (i = 0; i < avctx->
height; i++) {
73 /* lines are stored in reversed order */
75
76 for (j = 0; j < avctx->
width; j += 4) {
77 /* value is stored in LE dword with word swapped */
79 buf -= 4;
80 val = ((val >> 16) & 0xFFFF) | ((val & 0xFFFF) << 16);
81
82 if (!j)
83 y0 = (val & 0x1F) << 2;
84 else
86 val >>= 5;
87 y1 = y0 + xl_table[val & 0x1F];
88 val >>= 5;
89 y2 = y1 + xl_table[val & 0x1F];
90 val >>= 6; /* align to word */
91 y3 = y2 + xl_table[val & 0x1F];
92 val >>= 5;
93 if (!j)
94 c0 = (val & 0x1F) << 2;
95 else
96 c0 += xl_table[val & 0x1F];
97 val >>= 5;
98 if (!j)
99 c1 = (val & 0x1F) << 2;
100 else
101 c1 += xl_table[val & 0x1F];
102
103 Y[j + 0] = y0 << 1;
104 Y[j + 1] = y1 << 1;
105 Y[j + 2] = y2 << 1;
106 Y[j + 3] = y3 << 1;
107
108 U[j >> 2] = c0 << 1;
110 }
111
112 buf += avctx->
width + 4;
116 }
117
118 *got_frame = 1;
119
120 return buf_size;
121 }
122
124 {
126
127 return 0;
128 }
129
138 };
const char const char void * val
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
This structure describes decoded (raw) audio or video data.
ptrdiff_t const GLvoid * data
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
static const int xl_table[32]
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
const char * name
Name of the codec implementation.
enum AVPictureType pict_type
Picture type of the frame.
static av_cold int decode_init(AVCodecContext *avctx)
int width
picture width / height.
Libavcodec external API header.
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
main external API structure.
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
common internal api header.
common internal and external API header
planar YUV 4:1:1, 12bpp, (1 Cr & Cb sample per 4x1 Y samples)
int key_frame
1 -> keyframe, 0-> not
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
This structure stores compressed data.
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.