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 };