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targa_y216dec.c
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1 /*
2  * Pinnacle TARGA CineWave YUV16 decoder
3  * Copyright (c) 2012 Carl Eugen Hoyos
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "avcodec.h"
23 #include "internal.h"
24 
26 {
28  avctx->bits_per_raw_sample = 14;
29 
30  return 0;
31 }
32 
33 static int y216_decode_frame(AVCodecContext *avctx, void *data,
34  int *got_frame, AVPacket *avpkt)
35 {
36  AVFrame *pic = data;
37  const uint16_t *src = (uint16_t *)avpkt->data;
38  uint16_t *y, *u, *v, aligned_width = FFALIGN(avctx->width, 4);
39  int i, j, ret;
40 
41  if (avpkt->size < 4 * avctx->height * aligned_width) {
42  av_log(avctx, AV_LOG_ERROR, "Insufficient input data.\n");
43  return AVERROR(EINVAL);
44  }
45 
46  if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
47  return ret;
48 
49  pic->key_frame = 1;
51 
52  y = (uint16_t *)pic->data[0];
53  u = (uint16_t *)pic->data[1];
54  v = (uint16_t *)pic->data[2];
55 
56  for (i = 0; i < avctx->height; i++) {
57  for (j = 0; j < avctx->width >> 1; j++) {
58  u[ j ] = src[4 * j ] << 2 | src[4 * j ] >> 14;
59  y[2 * j ] = src[4 * j + 1] << 2 | src[4 * j + 1] >> 14;
60  v[ j ] = src[4 * j + 2] << 2 | src[4 * j + 2] >> 14;
61  y[2 * j + 1] = src[4 * j + 3] << 2 | src[4 * j + 3] >> 14;
62  }
63 
64  y += pic->linesize[0] >> 1;
65  u += pic->linesize[1] >> 1;
66  v += pic->linesize[2] >> 1;
67  src += aligned_width << 1;
68  }
69 
70  *got_frame = 1;
71 
72  return avpkt->size;
73 }
74 
76 {
77 
78  return 0;
79 }
80 
82  .name = "targa_y216",
83  .type = AVMEDIA_TYPE_VIDEO,
85  .init = y216_decode_init,
86  .decode = y216_decode_frame,
87  .close = y216_decode_close,
88  .capabilities = CODEC_CAP_DR1,
89  .long_name = NULL_IF_CONFIG_SMALL("Pinnacle TARGA CineWave YUV16"),
90 };