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v408dec.c
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1 /*
2  * v408 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 
29  return 0;
30 }
31 
32 static int v408_decode_frame(AVCodecContext *avctx, void *data,
33  int *got_frame, AVPacket *avpkt)
34 {
35  AVFrame *pic = data;
36  const uint8_t *src = avpkt->data;
37  uint8_t *y, *u, *v, *a;
38  int i, j, ret;
39 
40  if (avpkt->size < 4 * avctx->height * avctx->width) {
41  av_log(avctx, AV_LOG_ERROR, "Insufficient input data.\n");
42  return AVERROR(EINVAL);
43  }
44 
45  if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
46  return ret;
47 
48  pic->key_frame = 1;
50 
51  y = pic->data[0];
52  u = pic->data[1];
53  v = pic->data[2];
54  a = pic->data[3];
55 
56  for (i = 0; i < avctx->height; i++) {
57  for (j = 0; j < avctx->width; j++) {
58  if (avctx->codec_id==AV_CODEC_ID_AYUV) {
59  v[j] = *src++;
60  u[j] = *src++;
61  y[j] = *src++;
62  a[j] = *src++;
63  } else {
64  u[j] = *src++;
65  y[j] = *src++;
66  v[j] = *src++;
67  a[j] = *src++;
68  }
69  }
70 
71  y += pic->linesize[0];
72  u += pic->linesize[1];
73  v += pic->linesize[2];
74  a += pic->linesize[3];
75  }
76 
77  *got_frame = 1;
78 
79  return avpkt->size;
80 }
81 
82 #if CONFIG_AYUV_DECODER
83 AVCodec ff_ayuv_decoder = {
84  .name = "ayuv",
85  .long_name = NULL_IF_CONFIG_SMALL("Uncompressed packed MS 4:4:4:4"),
86  .type = AVMEDIA_TYPE_VIDEO,
87  .id = AV_CODEC_ID_AYUV,
88  .init = v408_decode_init,
89  .decode = v408_decode_frame,
90  .capabilities = CODEC_CAP_DR1,
91 };
92 #endif
93 #if CONFIG_V408_DECODER
94 AVCodec ff_v408_decoder = {
95  .name = "v408",
96  .long_name = NULL_IF_CONFIG_SMALL("Uncompressed packed QT 4:4:4:4"),
97  .type = AVMEDIA_TYPE_VIDEO,
98  .id = AV_CODEC_ID_V408,
99  .init = v408_decode_init,
100  .decode = v408_decode_frame,
101  .capabilities = CODEC_CAP_DR1,
102 };
103 #endif