FFmpeg
xl.c
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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 
27 #include "libavutil/common.h"
28 #include "libavutil/intreadwrite.h"
29 #include "avcodec.h"
30 #include "codec_internal.h"
31 #include "internal.h"
32 
33 static const int xl_table[32] = {
34  0, 1, 2, 3, 4, 5, 6, 7,
35  8, 9, 12, 15, 20, 25, 34, 46,
36  64, 82, 94, 103, 108, 113, 116, 119,
37  120, 121, 122, 123, 124, 125, 126, 127
38 };
39 
40 static int decode_frame(AVCodecContext *avctx, AVFrame *p,
41  int *got_frame, AVPacket *avpkt)
42 {
43  const uint8_t *buf = avpkt->data;
44  int buf_size = avpkt->size;
45  uint8_t *Y, *U, *V;
46  int i, j, ret;
47  int stride;
48  uint32_t val;
49  int y0, y1, y2, y3 = 0, c0 = 0, c1 = 0;
50 
51  if (avctx->width % 4) {
52  av_log(avctx, AV_LOG_ERROR, "width is not a multiple of 4\n");
53  return AVERROR_INVALIDDATA;
54  }
55  if (buf_size < avctx->width * avctx->height) {
56  av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
57  return AVERROR_INVALIDDATA;
58  }
59 
60  if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
61  return ret;
63  p->key_frame = 1;
64 
65  Y = p->data[0];
66  U = p->data[1];
67  V = p->data[2];
68 
69  stride = avctx->width - 4;
70 
71  for (i = 0; i < avctx->height; i++) {
72  /* lines are stored in reversed order */
73  buf += stride;
74 
75  for (j = 0; j < avctx->width; j += 4) {
76  /* value is stored in LE dword with word swapped */
77  val = AV_RL32(buf);
78  buf -= 4;
79  val = ((val >> 16) & 0xFFFF) | ((val & 0xFFFF) << 16);
80 
81  if (!j)
82  y0 = (val & 0x1F) << 2;
83  else
84  y0 = y3 + xl_table[val & 0x1F];
85  val >>= 5;
86  y1 = y0 + xl_table[val & 0x1F];
87  val >>= 5;
88  y2 = y1 + xl_table[val & 0x1F];
89  val >>= 6; /* align to word */
90  y3 = y2 + xl_table[val & 0x1F];
91  val >>= 5;
92  if (!j)
93  c0 = (val & 0x1F) << 2;
94  else
95  c0 += xl_table[val & 0x1F];
96  val >>= 5;
97  if (!j)
98  c1 = (val & 0x1F) << 2;
99  else
100  c1 += xl_table[val & 0x1F];
101 
102  Y[j + 0] = y0 << 1;
103  Y[j + 1] = y1 << 1;
104  Y[j + 2] = y2 << 1;
105  Y[j + 3] = y3 << 1;
106 
107  U[j >> 2] = c0 << 1;
108  V[j >> 2] = c1 << 1;
109  }
110 
111  buf += avctx->width + 4;
112  Y += p->linesize[0];
113  U += p->linesize[1];
114  V += p->linesize[2];
115  }
116 
117  *got_frame = 1;
118 
119  return buf_size;
120 }
121 
123 {
124  avctx->pix_fmt = AV_PIX_FMT_YUV411P;
125 
126  return 0;
127 }
128 
130  .p.name = "xl",
131  .p.long_name = NULL_IF_CONFIG_SMALL("Miro VideoXL"),
132  .p.type = AVMEDIA_TYPE_VIDEO,
133  .p.id = AV_CODEC_ID_VIXL,
134  .init = decode_init,
136  .p.capabilities = AV_CODEC_CAP_DR1,
137 };
decode_init
static av_cold int decode_init(AVCodecContext *avctx)
Definition: xl.c:122
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:325
internal.h
AVPacket::data
uint8_t * data
Definition: packet.h:374
FFCodec
Definition: codec_internal.h:118
c1
static const uint64_t c1
Definition: murmur3.c:51
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:346
ff_xl_decoder
const FFCodec ff_xl_decoder
Definition: xl.c:129
FFCodec::p
AVCodec p
The public AVCodec.
Definition: codec_internal.h:122
AVFrame::key_frame
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:417
val
static double val(void *priv, double ch)
Definition: aeval.c:77
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
av_cold
#define av_cold
Definition: attributes.h:90
width
#define width
FF_CODEC_DECODE_CB
#define FF_CODEC_DECODE_CB(func)
Definition: codec_internal.h:260
intreadwrite.h
V
#define V
Definition: avdct.c:30
AV_PICTURE_TYPE_I
@ AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:274
AVFrame::pict_type
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:422
ff_get_buffer
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1462
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
AVPacket::size
int size
Definition: packet.h:375
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
codec_internal.h
decode_frame
static int decode_frame(AVCodecContext *avctx, AVFrame *p, int *got_frame, AVPacket *avpkt)
Definition: xl.c:40
Y
#define Y
Definition: boxblur.h:37
xl_table
static const int xl_table[32]
Definition: xl.c:33
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
common.h
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:211
AV_CODEC_ID_VIXL
@ AV_CODEC_ID_VIXL
Definition: codec_id.h:109
AVCodecContext::height
int height
Definition: avcodec.h:571
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:608
avcodec.h
stride
#define stride
Definition: h264pred_template.c:537
ret
ret
Definition: filter_design.txt:187
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:92
U
#define U(x)
Definition: vpx_arith.h:37
AVCodecContext
main external API structure.
Definition: avcodec.h:398
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AVPacket
This structure stores compressed data.
Definition: packet.h:351
AV_PIX_FMT_YUV411P
@ AV_PIX_FMT_YUV411P
planar YUV 4:1:1, 12bpp, (1 Cr & Cb sample per 4x1 Y samples)
Definition: pixfmt.h:73
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:571
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, a positive or negative value, which is typically indicating the size in bytes of each pict...
Definition: frame.h:370
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61