FFmpeg
 All Data Structures Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
targa_y216dec.c
Go to the documentation of this file.
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 
31 
32  if (!avctx->coded_frame) {
33  av_log(avctx, AV_LOG_ERROR, "Could not allocate frame.\n");
34  return AVERROR(ENOMEM);
35  }
36 
37  return 0;
38 }
39 
40 static int y216_decode_frame(AVCodecContext *avctx, void *data,
41  int *got_frame, AVPacket *avpkt)
42 {
43  AVFrame *pic = avctx->coded_frame;
44  const uint16_t *src = (uint16_t *)avpkt->data;
45  uint16_t *y, *u, *v, aligned_width = FFALIGN(avctx->width, 4);
46  int i, j;
47 
48  if (pic->data[0])
49  avctx->release_buffer(avctx, pic);
50 
51  if (avpkt->size < 4 * avctx->height * aligned_width) {
52  av_log(avctx, AV_LOG_ERROR, "Insufficient input data.\n");
53  return AVERROR(EINVAL);
54  }
55 
56  pic->reference = 0;
57 
58  if (ff_get_buffer(avctx, pic) < 0) {
59  av_log(avctx, AV_LOG_ERROR, "Could not allocate buffer.\n");
60  return AVERROR(ENOMEM);
61  }
62 
63  pic->key_frame = 1;
65 
66  y = (uint16_t *)pic->data[0];
67  u = (uint16_t *)pic->data[1];
68  v = (uint16_t *)pic->data[2];
69 
70  for (i = 0; i < avctx->height; i++) {
71  for (j = 0; j < avctx->width >> 1; j++) {
72  u[ j ] = src[4 * j ] << 2 | src[4 * j ] >> 14;
73  y[2 * j ] = src[4 * j + 1] << 2 | src[4 * j + 1] >> 14;
74  v[ j ] = src[4 * j + 2] << 2 | src[4 * j + 2] >> 14;
75  y[2 * j + 1] = src[4 * j + 3] << 2 | src[4 * j + 3] >> 14;
76  }
77 
78  y += pic->linesize[0] >> 1;
79  u += pic->linesize[1] >> 1;
80  v += pic->linesize[2] >> 1;
81  src += aligned_width << 1;
82  }
83 
84  *got_frame = 1;
85  *(AVFrame *)data = *pic;
86 
87  return avpkt->size;
88 }
89 
91 {
92  if (avctx->coded_frame->data[0])
93  avctx->release_buffer(avctx, avctx->coded_frame);
94 
95  av_freep(&avctx->coded_frame);
96 
97  return 0;
98 }
99 
101  .name = "targa_y216",
102  .type = AVMEDIA_TYPE_VIDEO,
104  .init = y216_decode_init,
105  .decode = y216_decode_frame,
106  .close = y216_decode_close,
107  .capabilities = CODEC_CAP_DR1,
108  .long_name = NULL_IF_CONFIG_SMALL("Pinnacle TARGA CineWave YUV16"),
109 };