Libav
v410dec.c
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1 /*
2  * v410 decoder
3  *
4  * Copyright (c) 2011 Derek Buitenhuis
5  *
6  * This file is part of Libav.
7  *
8  * Libav is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * Libav is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with Libav; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include "libavutil/common.h"
24 #include "libavutil/intreadwrite.h"
25 #include "avcodec.h"
26 #include "internal.h"
27 
29 {
31  avctx->bits_per_raw_sample = 10;
32 
33  if (avctx->width & 1) {
34  if (avctx->err_recognition & AV_EF_EXPLODE) {
35  av_log(avctx, AV_LOG_ERROR, "v410 requires width to be even.\n");
36  return AVERROR_INVALIDDATA;
37  } else {
38  av_log(avctx, AV_LOG_WARNING, "v410 requires width to be even, continuing anyway.\n");
39  }
40  }
41 
42  return 0;
43 }
44 
45 static int v410_decode_frame(AVCodecContext *avctx, void *data,
46  int *got_frame, AVPacket *avpkt)
47 {
48  AVFrame *pic = data;
49  uint8_t *src = avpkt->data;
50  uint16_t *y, *u, *v;
51  uint32_t val;
52  int i, j;
53 
54  if (avpkt->size < 4 * avctx->height * avctx->width) {
55  av_log(avctx, AV_LOG_ERROR, "Insufficient input data.\n");
56  return AVERROR(EINVAL);
57  }
58 
59  if (ff_get_buffer(avctx, pic, 0) < 0) {
60  av_log(avctx, AV_LOG_ERROR, "Could not allocate buffer.\n");
61  return AVERROR(ENOMEM);
62  }
63 
64  pic->key_frame = 1;
66 
67  y = (uint16_t *)pic->data[0];
68  u = (uint16_t *)pic->data[1];
69  v = (uint16_t *)pic->data[2];
70 
71  for (i = 0; i < avctx->height; i++) {
72  for (j = 0; j < avctx->width; j++) {
73  val = AV_RL32(src);
74 
75  u[j] = (val >> 2) & 0x3FF;
76  y[j] = (val >> 12) & 0x3FF;
77  v[j] = (val >> 22);
78 
79  src += 4;
80  }
81 
82  y += pic->linesize[0] >> 1;
83  u += pic->linesize[1] >> 1;
84  v += pic->linesize[2] >> 1;
85  }
86 
87  *got_frame = 1;
88 
89  return avpkt->size;
90 }
91 
93  .name = "v410",
94  .long_name = NULL_IF_CONFIG_SMALL("Uncompressed 4:4:4 10-bit"),
95  .type = AVMEDIA_TYPE_VIDEO,
96  .id = AV_CODEC_ID_V410,
97  .init = v410_decode_init,
98  .decode = v410_decode_frame,
99  .capabilities = CODEC_CAP_DR1,
100 };