Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / 012v.c
CommitLineData
2ba45a60
DM
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
27static av_cold int zero12v_decode_init(AVCodecContext *avctx)
28{
29 avctx->pix_fmt = AV_PIX_FMT_YUV422P16;
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
38static 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
67 pic->pict_type = AV_PICTURE_TYPE_I;
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
151AVCodec ff_zero12v_decoder = {
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};