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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 | ||
27 | static 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 | ||
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 | ||
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 | ||
151 | AVCodec 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 | }; |