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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 
30 
31  if (!avctx->coded_frame) {
32  av_log(avctx, AV_LOG_ERROR, "Could not allocate frame.\n");
33  return AVERROR(ENOMEM);
34  }
35 
36  return 0;
37 }
38 
39 static int v408_decode_frame(AVCodecContext *avctx, void *data,
40  int *got_frame, AVPacket *avpkt)
41 {
42  AVFrame *pic = avctx->coded_frame;
43  const uint8_t *src = avpkt->data;
44  uint8_t *y, *u, *v, *a;
45  int i, j;
46 
47  if (pic->data[0])
48  avctx->release_buffer(avctx, pic);
49 
50  if (avpkt->size < 4 * avctx->height * avctx->width) {
51  av_log(avctx, AV_LOG_ERROR, "Insufficient input data.\n");
52  return AVERROR(EINVAL);
53  }
54 
55  pic->reference = 0;
56 
57  if (ff_get_buffer(avctx, pic) < 0) {
58  av_log(avctx, AV_LOG_ERROR, "Could not allocate buffer.\n");
59  return AVERROR(ENOMEM);
60  }
61 
62  pic->key_frame = 1;
64 
65  y = pic->data[0];
66  u = pic->data[1];
67  v = pic->data[2];
68  a = pic->data[3];
69 
70  for (i = 0; i < avctx->height; i++) {
71  for (j = 0; j < avctx->width; j++) {
72  if (avctx->codec_id==AV_CODEC_ID_AYUV) {
73  v[j] = *src++;
74  u[j] = *src++;
75  y[j] = *src++;
76  a[j] = *src++;
77  } else {
78  u[j] = *src++;
79  y[j] = *src++;
80  v[j] = *src++;
81  a[j] = *src++;
82  }
83  }
84 
85  y += pic->linesize[0];
86  u += pic->linesize[1];
87  v += pic->linesize[2];
88  a += pic->linesize[3];
89  }
90 
91  *got_frame = 1;
92  *(AVFrame *)data = *pic;
93 
94  return avpkt->size;
95 }
96 
98 {
99  if (avctx->coded_frame->data[0])
100  avctx->release_buffer(avctx, avctx->coded_frame);
101 
102  av_freep(&avctx->coded_frame);
103 
104  return 0;
105 }
106 
107 #if CONFIG_AYUV_DECODER
108 AVCodec ff_ayuv_decoder = {
109  .name = "ayuv",
110  .type = AVMEDIA_TYPE_VIDEO,
111  .id = AV_CODEC_ID_AYUV,
112  .init = v408_decode_init,
113  .decode = v408_decode_frame,
114  .close = v408_decode_close,
115  .capabilities = CODEC_CAP_DR1,
116  .long_name = NULL_IF_CONFIG_SMALL("Uncompressed packed MS 4:4:4:4"),
117 };
118 #endif
119 #if CONFIG_V408_DECODER
120 AVCodec ff_v408_decoder = {
121  .name = "v408",
122  .type = AVMEDIA_TYPE_VIDEO,
123  .id = AV_CODEC_ID_V408,
124  .init = v408_decode_init,
125  .decode = v408_decode_frame,
126  .close = v408_decode_close,
127  .capabilities = CODEC_CAP_DR1,
128  .long_name = NULL_IF_CONFIG_SMALL("Uncompressed packed QT 4:4:4:4"),
129 };
130 #endif