FFmpeg
v210x.c
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1 /*
2  * Copyright (C) 2009 Michael Niedermayer <michaelni@gmx.at>
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include "avcodec.h"
22 #include "internal.h"
23 #include "libavutil/bswap.h"
24 #include "libavutil/internal.h"
25 #include "libavutil/mem.h"
26 
28 {
29  if (avctx->width & 1) {
30  av_log(avctx, AV_LOG_ERROR, "v210x needs even width\n");
31  return AVERROR(EINVAL);
32  }
34  avctx->bits_per_raw_sample = 10;
35 
36  return 0;
37 }
38 
39 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
40  AVPacket *avpkt)
41 {
42  const uint32_t *src = (const uint32_t *)avpkt->data;
43  AVFrame *pic = data;
44  int width = avctx->width;
45  int y = 0;
46  uint16_t *ydst, *udst, *vdst, *yend;
47  int ret;
48 
49  if (avpkt->size < avctx->width * avctx->height * 8 / 3) {
50  av_log(avctx, AV_LOG_ERROR, "Packet too small\n");
51  return AVERROR_INVALIDDATA;
52  }
53 
54  if (avpkt->size > avctx->width * avctx->height * 8 / 3) {
55  avpriv_request_sample(avctx, "(Probably) padded data");
56  }
57 
58  if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
59  return ret;
60 
61  ydst = (uint16_t *)pic->data[0];
62  udst = (uint16_t *)pic->data[1];
63  vdst = (uint16_t *)pic->data[2];
64  yend = ydst + width;
65  pic->pict_type = AV_PICTURE_TYPE_I;
66  pic->key_frame = 1;
67 
68  for (;;) {
69  uint32_t v = av_be2ne32(*src++);
70  *udst++ = (v >> 16) & 0xFFC0;
71  *ydst++ = (v >> 6 ) & 0xFFC0;
72  *vdst++ = (v << 4 ) & 0xFFC0;
73 
74  v = av_be2ne32(*src++);
75  *ydst++ = (v >> 16) & 0xFFC0;
76 
77  if (ydst >= yend) {
78  ydst += pic->linesize[0] / 2 - width;
79  udst += pic->linesize[1] / 2 - width / 2;
80  vdst += pic->linesize[2] / 2 - width / 2;
81  yend = ydst + width;
82  if (++y >= avctx->height)
83  break;
84  }
85 
86  *udst++ = (v >> 6 ) & 0xFFC0;
87  *ydst++ = (v << 4 ) & 0xFFC0;
88 
89  v = av_be2ne32(*src++);
90  *vdst++ = (v >> 16) & 0xFFC0;
91  *ydst++ = (v >> 6 ) & 0xFFC0;
92 
93  if (ydst >= yend) {
94  ydst += pic->linesize[0] / 2 - width;
95  udst += pic->linesize[1] / 2 - width / 2;
96  vdst += pic->linesize[2] / 2 - width / 2;
97  yend = ydst + width;
98  if (++y >= avctx->height)
99  break;
100  }
101 
102  *udst++ = (v << 4 ) & 0xFFC0;
103 
104  v = av_be2ne32(*src++);
105  *ydst++ = (v >> 16) & 0xFFC0;
106  *vdst++ = (v >> 6 ) & 0xFFC0;
107  *ydst++ = (v << 4 ) & 0xFFC0;
108  if (ydst >= yend) {
109  ydst += pic->linesize[0] / 2 - width;
110  udst += pic->linesize[1] / 2 - width / 2;
111  vdst += pic->linesize[2] / 2 - width / 2;
112  yend = ydst + width;
113  if (++y >= avctx->height)
114  break;
115  }
116  }
117 
118  *got_frame = 1;
119 
120  return avpkt->size;
121 }
122 
124  .name = "v210x",
125  .long_name = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"),
126  .type = AVMEDIA_TYPE_VIDEO,
127  .id = AV_CODEC_ID_V210X,
128  .init = decode_init,
129  .decode = decode_frame,
130  .capabilities = AV_CODEC_CAP_DR1,
131  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
132 };
AVCodec
AVCodec.
Definition: codec.h:197
FF_CODEC_CAP_INIT_THREADSAFE
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
Definition: internal.h:41
decode_init
static av_cold int decode_init(AVCodecContext *avctx)
Definition: v210x.c:27
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:303
internal.h
AVPacket::data
uint8_t * data
Definition: packet.h:365
data
const char data[16]
Definition: mxf.c:142
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:181
av_cold
#define av_cold
Definition: attributes.h:90
AV_PIX_FMT_YUV422P16
#define AV_PIX_FMT_YUV422P16
Definition: pixfmt.h:401
width
#define width
AVCodecContext::bits_per_raw_sample
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
Definition: avcodec.h:1531
if
if(ret)
Definition: filter_design.txt:179
av_be2ne32
#define av_be2ne32(x)
Definition: bswap.h:93
AV_PICTURE_TYPE_I
@ AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:274
src
#define src
Definition: vp8dsp.c:255
for
for(j=16;j >0;--j)
Definition: h264pred_template.c:469
ff_get_buffer
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1638
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:366
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
AV_CODEC_ID_V210X
@ AV_CODEC_ID_V210X
Definition: codec_id.h:174
internal.h
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:204
AVCodecContext::height
int height
Definition: avcodec.h:674
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:711
avcodec.h
decode_frame
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: v210x.c:39
ret
ret
Definition: filter_design.txt:187
bswap.h
AVCodecContext
main external API structure.
Definition: avcodec.h:501
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
mem.h
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:39
AVPacket
This structure stores compressed data.
Definition: packet.h:342
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:674
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
ff_v210x_decoder
const AVCodec ff_v210x_decoder
Definition: v210x.c:123