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012v.c
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1 /*
2  * 012v decoder
3  *
4  * Copyright (C) 2012 Carl Eugen Hoyos
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include "avcodec.h"
24 #include "internal.h"
25 #include "libavutil/intreadwrite.h"
26 
28 {
30  avctx->bits_per_raw_sample = 10;
31 
32  if (avctx->codec_tag == MKTAG('a', '1', '2', 'v'))
33  avpriv_request_sample(avctx, "transparency");
34 
35  return 0;
36 }
37 
38 static int zero12v_decode_frame(AVCodecContext *avctx, void *data,
39  int *got_frame, AVPacket *avpkt)
40 {
41  int line = 0, ret;
42  const int width = avctx->width;
43  AVFrame *pic = data;
44  uint16_t *y, *u, *v;
45  const uint8_t *line_end, *src = avpkt->data;
46  int stride = avctx->width * 8 / 3;
47 
48  if (width == 1) {
49  av_log(avctx, AV_LOG_ERROR, "Width 1 not supported.\n");
50  return AVERROR_INVALIDDATA;
51  }
52 
53  if ( avctx->codec_tag == MKTAG('0', '1', '2', 'v')
54  && avpkt->size % avctx->height == 0
55  && avpkt->size / avctx->height * 3 >= width * 8)
56  stride = avpkt->size / avctx->height;
57 
58  if (avpkt->size < avctx->height * stride) {
59  av_log(avctx, AV_LOG_ERROR, "Packet too small: %d instead of %d\n",
60  avpkt->size, avctx->height * stride);
61  return AVERROR_INVALIDDATA;
62  }
63 
64  if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
65  return ret;
66 
68  pic->key_frame = 1;
69 
70  y = (uint16_t *)pic->data[0];
71  u = (uint16_t *)pic->data[1];
72  v = (uint16_t *)pic->data[2];
73  line_end = avpkt->data + stride;
74 
75  while (line++ < avctx->height) {
76  while (1) {
77  uint32_t t = AV_RL32(src);
78  src += 4;
79  *u++ = t << 6 & 0xFFC0;
80  *y++ = t >> 4 & 0xFFC0;
81  *v++ = t >> 14 & 0xFFC0;
82 
83  if (src >= line_end - 1) {
84  *y = 0x80;
85  src++;
86  line_end += stride;
87  y = (uint16_t *)(pic->data[0] + line * pic->linesize[0]);
88  u = (uint16_t *)(pic->data[1] + line * pic->linesize[1]);
89  v = (uint16_t *)(pic->data[2] + line * pic->linesize[2]);
90  break;
91  }
92 
93  t = AV_RL32(src);
94  src += 4;
95  *y++ = t << 6 & 0xFFC0;
96  *u++ = t >> 4 & 0xFFC0;
97  *y++ = t >> 14 & 0xFFC0;
98  if (src >= line_end - 2) {
99  if (!(width & 1)) {
100  *y = 0x80;
101  src += 2;
102  }
103  line_end += stride;
104  y = (uint16_t *)(pic->data[0] + line * pic->linesize[0]);
105  u = (uint16_t *)(pic->data[1] + line * pic->linesize[1]);
106  v = (uint16_t *)(pic->data[2] + line * pic->linesize[2]);
107  break;
108  }
109 
110  t = AV_RL32(src);
111  src += 4;
112  *v++ = t << 6 & 0xFFC0;
113  *y++ = t >> 4 & 0xFFC0;
114  *u++ = t >> 14 & 0xFFC0;
115 
116  if (src >= line_end - 1) {
117  *y = 0x80;
118  src++;
119  line_end += stride;
120  y = (uint16_t *)(pic->data[0] + line * pic->linesize[0]);
121  u = (uint16_t *)(pic->data[1] + line * pic->linesize[1]);
122  v = (uint16_t *)(pic->data[2] + line * pic->linesize[2]);
123  break;
124  }
125 
126  t = AV_RL32(src);
127  src += 4;
128  *y++ = t << 6 & 0xFFC0;
129  *v++ = t >> 4 & 0xFFC0;
130  *y++ = t >> 14 & 0xFFC0;
131 
132  if (src >= line_end - 2) {
133  if (width & 1) {
134  *y = 0x80;
135  src += 2;
136  }
137  line_end += stride;
138  y = (uint16_t *)(pic->data[0] + line * pic->linesize[0]);
139  u = (uint16_t *)(pic->data[1] + line * pic->linesize[1]);
140  v = (uint16_t *)(pic->data[2] + line * pic->linesize[2]);
141  break;
142  }
143  }
144  }
145 
146  *got_frame = 1;
147 
148  return avpkt->size;
149 }
150 
152  .name = "012v",
153  .long_name = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"),
154  .type = AVMEDIA_TYPE_VIDEO,
155  .id = AV_CODEC_ID_012V,
156  .init = zero12v_decode_init,
157  .decode = zero12v_decode_frame,
158  .capabilities = CODEC_CAP_DR1,
159 };