Libav
v210dec.c
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1 /*
2  * V210 decoder
3  *
4  * Copyright (C) 2009 Michael Niedermayer <michaelni@gmx.at>
5  * Copyright (c) 2009 Baptiste Coudurier <baptiste dot coudurier at gmail dot com>
6  *
7  * This file is part of Libav.
8  *
9  * Libav is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU Lesser General Public
11  * License as published by the Free Software Foundation; either
12  * version 2.1 of the License, or (at your option) any later version.
13  *
14  * Libav is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17  * Lesser General Public License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with Libav; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22  */
23 
24 #include "avcodec.h"
25 #include "internal.h"
26 #include "libavutil/bswap.h"
27 #include "libavutil/internal.h"
28 #include "libavutil/mem.h"
29 
31 {
32  if (avctx->width & 1) {
33  av_log(avctx, AV_LOG_ERROR, "v210 needs even width\n");
34  return AVERROR_INVALIDDATA;
35  }
37  avctx->bits_per_raw_sample = 10;
38 
39  return 0;
40 }
41 
42 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
43  AVPacket *avpkt)
44 {
45  int h, w, ret;
46  AVFrame *pic = data;
47  const uint8_t *psrc = avpkt->data;
48  uint16_t *y, *u, *v;
49  int aligned_width = ((avctx->width + 47) / 48) * 48;
50  int stride = aligned_width * 8 / 3;
51 
52  if (avpkt->size < stride * avctx->height) {
53  av_log(avctx, AV_LOG_ERROR, "packet too small\n");
54  return AVERROR_INVALIDDATA;
55  }
56 
57  if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
58  return ret;
59 
60  y = (uint16_t*)pic->data[0];
61  u = (uint16_t*)pic->data[1];
62  v = (uint16_t*)pic->data[2];
64  pic->key_frame = 1;
65 
66 #define READ_PIXELS(a, b, c) \
67  do { \
68  val = av_le2ne32(*src++); \
69  *a++ = val & 0x3FF; \
70  *b++ = (val >> 10) & 0x3FF; \
71  *c++ = (val >> 20) & 0x3FF; \
72  } while (0)
73 
74  for (h = 0; h < avctx->height; h++) {
75  const uint32_t *src = (const uint32_t*)psrc;
76  uint32_t val;
77  for (w = 0; w < avctx->width - 5; w += 6) {
78  READ_PIXELS(u, y, v);
79  READ_PIXELS(y, u, y);
80  READ_PIXELS(v, y, u);
81  READ_PIXELS(y, v, y);
82  }
83  if (w < avctx->width - 1) {
84  READ_PIXELS(u, y, v);
85 
86  val = av_le2ne32(*src++);
87  *y++ = val & 0x3FF;
88  }
89  if (w < avctx->width - 3) {
90  *u++ = (val >> 10) & 0x3FF;
91  *y++ = (val >> 20) & 0x3FF;
92 
93  val = av_le2ne32(*src++);
94  *v++ = val & 0x3FF;
95  *y++ = (val >> 10) & 0x3FF;
96  }
97 
98  psrc += stride;
99  y += pic->linesize[0] / 2 - avctx->width;
100  u += pic->linesize[1] / 2 - avctx->width / 2;
101  v += pic->linesize[2] / 2 - avctx->width / 2;
102  }
103 
104  *got_frame = 1;
105 
106  return avpkt->size;
107 }
108 
110  .name = "v210",
111  .long_name = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"),
112  .type = AVMEDIA_TYPE_VIDEO,
113  .id = AV_CODEC_ID_V210,
114  .init = decode_init,
115  .decode = decode_frame,
116  .capabilities = CODEC_CAP_DR1,
117 };
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:54
This structure describes decoded (raw) audio or video data.
Definition: frame.h:135
int size
Definition: avcodec.h:974
void av_log(void *avcl, int level, const char *fmt,...) av_printf_format(3
Send the specified message to the log if the level is less than or equal to the current av_log_level...
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1254
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
Definition: avcodec.h:2514
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: v210dec.c:42
int stride
Definition: mace.c:144
AVCodec.
Definition: avcodec.h:2796
AVCodec ff_v210_decoder
Definition: v210dec.c:109
uint8_t
static av_cold int decode_init(AVCodecContext *avctx)
Definition: v210dec.c:30
#define b
Definition: input.c:52
const char * name
Name of the codec implementation.
Definition: avcodec.h:2803
#define CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:684
const char data[16]
Definition: mxf.c:70
#define READ_PIXELS(a, b, c)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:150
Libavcodec external API header.
common internal API header
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:196
int width
picture width / height.
Definition: avcodec.h:1224
static int width
Definition: utils.c:156
#define av_cold
Definition: attributes.h:66
main external API structure.
Definition: avcodec.h:1050
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: utils.c:612
uint8_t * data
Definition: avcodec.h:973
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:153
common internal api header.
#define av_le2ne32(x)
Definition: bswap.h:98
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:191
This structure stores compressed data.
Definition: avcodec.h:950
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:141
#define AV_PIX_FMT_YUV422P10
Definition: pixfmt.h:244