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1 | /* |
2 | * V210 decoder | |
3 | * | |
4 | * Copyright (C) 2009 Michael Niedermayer <michaelni@gmx.at> | |
5 | * Copyright (c) 2009 Baptiste Coudurier <baptiste dot coudurier at gmail dot com> | |
6 | * | |
7 | * This file is part of FFmpeg. | |
8 | * | |
9 | * FFmpeg is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU Lesser General Public | |
11 | * License as published by the Free Software Foundation; either | |
12 | * version 2.1 of the License, or (at your option) any later version. | |
13 | * | |
14 | * FFmpeg is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * Lesser General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU Lesser General Public | |
20 | * License along with FFmpeg; if not, write to the Free Software | |
21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
22 | */ | |
23 | ||
24 | #include "avcodec.h" | |
25 | #include "libavutil/bswap.h" | |
26 | ||
27 | static av_cold int decode_init(AVCodecContext *avctx) | |
28 | { | |
29 | if (avctx->width & 1) { | |
30 | av_log(avctx, AV_LOG_ERROR, "v210 needs even width\n"); | |
31 | return -1; | |
32 | } | |
33 | if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) | |
34 | return -1; | |
35 | avctx->pix_fmt = PIX_FMT_YUV422P16; | |
36 | avctx->bits_per_raw_sample = 10; | |
37 | ||
38 | avctx->coded_frame = avcodec_alloc_frame(); | |
39 | ||
40 | return 0; | |
41 | } | |
42 | ||
43 | static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt) | |
44 | { | |
45 | int h, w; | |
46 | AVFrame *pic = avctx->coded_frame; | |
47 | const uint8_t *psrc = avpkt->data; | |
48 | uint16_t *y, *u, *v; | |
49 | int aligned_width = ((avctx->width + 47) / 48) * 48; | |
50 | int stride = aligned_width * 8 / 3; | |
51 | ||
52 | if (pic->data[0]) | |
53 | avctx->release_buffer(avctx, pic); | |
54 | ||
55 | if (avpkt->size < stride * avctx->height) { | |
56 | av_log(avctx, AV_LOG_ERROR, "packet too small\n"); | |
57 | return -1; | |
58 | } | |
59 | ||
60 | pic->reference = 0; | |
61 | if (avctx->get_buffer(avctx, pic) < 0) | |
62 | return -1; | |
63 | ||
64 | y = pic->data[0]; | |
65 | u = pic->data[1]; | |
66 | v = pic->data[2]; | |
67 | pic->pict_type = FF_I_TYPE; | |
68 | pic->key_frame = 1; | |
69 | ||
70 | #define READ_PIXELS(a, b, c) \ | |
71 | do { \ | |
72 | val = le2me_32(*src++); \ | |
73 | *a++ = val << 6; \ | |
74 | *b++ = (val >> 4) & 0xFFC0; \ | |
75 | *c++ = (val >> 14) & 0xFFC0; \ | |
76 | } while (0); | |
77 | ||
78 | for (h = 0; h < avctx->height; h++) { | |
79 | const uint32_t *src = psrc; | |
80 | uint32_t val; | |
81 | for (w = 0; w < avctx->width - 5; w += 6) { | |
82 | READ_PIXELS(u, y, v); | |
83 | READ_PIXELS(y, u, y); | |
84 | READ_PIXELS(v, y, u); | |
85 | READ_PIXELS(y, v, y); | |
86 | } | |
87 | if (w < avctx->width - 1) { | |
88 | READ_PIXELS(u, y, v); | |
89 | ||
90 | val = le2me_32(*src++); | |
91 | *y++ = val << 6; | |
92 | } | |
93 | if (w < avctx->width - 3) { | |
94 | *u++ = (val >> 4) & 0xFFC0; | |
95 | *y++ = (val >> 14) & 0xFFC0; | |
96 | ||
97 | val = le2me_32(*src++); | |
98 | *v++ = val << 6; | |
99 | *y++ = (val >> 4) & 0xFFC0; | |
100 | } | |
101 | ||
102 | psrc += stride; | |
103 | y += pic->linesize[0]/2 - avctx->width; | |
104 | u += pic->linesize[1]/2 - avctx->width/2; | |
105 | v += pic->linesize[2]/2 - avctx->width/2; | |
106 | } | |
107 | ||
108 | *data_size = sizeof(AVFrame); | |
109 | *(AVFrame*)data = *avctx->coded_frame; | |
110 | ||
111 | return avpkt->size; | |
112 | } | |
113 | ||
114 | static av_cold int decode_close(AVCodecContext *avctx) | |
115 | { | |
116 | av_freep(&avctx->coded_frame); | |
117 | ||
118 | return 0; | |
119 | } | |
120 | ||
121 | AVCodec v210_decoder = { | |
122 | "v210", | |
123 | CODEC_TYPE_VIDEO, | |
124 | CODEC_ID_V210, | |
125 | 0, | |
126 | decode_init, | |
127 | NULL, | |
128 | decode_close, | |
129 | decode_frame, | |
130 | CODEC_CAP_DR1, | |
131 | .long_name = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"), | |
132 | }; |