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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 = CODEC_CAP_DR1,
131 };