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v308dec.c
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1 /*
2  * v308 decoder
3  * Copyright (c) 2011 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 {
27  avctx->pix_fmt = AV_PIX_FMT_YUV444P;
28 
29  if (avctx->width & 1)
30  av_log(avctx, AV_LOG_WARNING, "v308 requires width to be even.\n");
31 
32  return 0;
33 }
34 
35 static int v308_decode_frame(AVCodecContext *avctx, void *data,
36  int *got_frame, AVPacket *avpkt)
37 {
38  AVFrame *pic = data;
39  const uint8_t *src = avpkt->data;
40  uint8_t *y, *u, *v;
41  int i, j, ret;
42 
43  if (avpkt->size < 3 * avctx->height * avctx->width) {
44  av_log(avctx, AV_LOG_ERROR, "Insufficient input data.\n");
45  return AVERROR(EINVAL);
46  }
47 
48  if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
49  return ret;
50 
51  pic->key_frame = 1;
53 
54  y = pic->data[0];
55  u = pic->data[1];
56  v = pic->data[2];
57 
58  for (i = 0; i < avctx->height; i++) {
59  for (j = 0; j < avctx->width; j++) {
60  v[j] = *src++;
61  y[j] = *src++;
62  u[j] = *src++;
63  }
64 
65  y += pic->linesize[0];
66  u += pic->linesize[1];
67  v += pic->linesize[2];
68  }
69 
70  *got_frame = 1;
71 
72  return avpkt->size;
73 }
74 
76  .name = "v308",
77  .type = AVMEDIA_TYPE_VIDEO,
78  .id = AV_CODEC_ID_V308,
79  .init = v308_decode_init,
80  .decode = v308_decode_frame,
81  .capabilities = CODEC_CAP_DR1,
82  .long_name = NULL_IF_CONFIG_SMALL("Uncompressed packed 4:4:4"),
83 };