AVOptions: remove AVOption.offset <= 0 checks
[libav.git] / libavcodec / v210dec.c
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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 *
2912e87a 7 * This file is part of Libav.
ca0bb1c4 8 *
2912e87a 9 * Libav is free software; you can redistribute it and/or
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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 *
2912e87a 14 * Libav is distributed in the hope that it will be useful,
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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
2912e87a 20 * License along with Libav; if not, write to the Free Software
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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
27static 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 }
d87d5025 33 avctx->pix_fmt = PIX_FMT_YUV422P16;
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34 avctx->bits_per_raw_sample = 10;
35
d87d5025 36 avctx->coded_frame = avcodec_alloc_frame();
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37
38 return 0;
39}
40
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41static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
42 AVPacket *avpkt)
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43{
44 int h, w;
45 AVFrame *pic = avctx->coded_frame;
46 const uint8_t *psrc = avpkt->data;
47 uint16_t *y, *u, *v;
48 int aligned_width = ((avctx->width + 47) / 48) * 48;
49 int stride = aligned_width * 8 / 3;
50
51 if (pic->data[0])
52 avctx->release_buffer(avctx, pic);
53
54 if (avpkt->size < stride * avctx->height) {
55 av_log(avctx, AV_LOG_ERROR, "packet too small\n");
56 return -1;
57 }
58
59 pic->reference = 0;
60 if (avctx->get_buffer(avctx, pic) < 0)
61 return -1;
62
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63 y = (uint16_t*)pic->data[0];
64 u = (uint16_t*)pic->data[1];
65 v = (uint16_t*)pic->data[2];
975a1447 66 pic->pict_type = AV_PICTURE_TYPE_I;
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67 pic->key_frame = 1;
68
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69#define READ_PIXELS(a, b, c) \
70 do { \
8fc0162a 71 val = av_le2ne32(*src++); \
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72 *a++ = val << 6; \
73 *b++ = (val >> 4) & 0xFFC0; \
74 *c++ = (val >> 14) & 0xFFC0; \
e20b196d 75 } while (0)
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76
77 for (h = 0; h < avctx->height; h++) {
03e4f1ed 78 const uint32_t *src = (const uint32_t*)psrc;
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79 uint32_t val;
80 for (w = 0; w < avctx->width - 5; w += 6) {
81 READ_PIXELS(u, y, v);
82 READ_PIXELS(y, u, y);
83 READ_PIXELS(v, y, u);
84 READ_PIXELS(y, v, y);
85 }
86 if (w < avctx->width - 1) {
87 READ_PIXELS(u, y, v);
88
8fc0162a 89 val = av_le2ne32(*src++);
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90 *y++ = val << 6;
91 }
92 if (w < avctx->width - 3) {
93 *u++ = (val >> 4) & 0xFFC0;
94 *y++ = (val >> 14) & 0xFFC0;
95
8fc0162a 96 val = av_le2ne32(*src++);
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97 *v++ = val << 6;
98 *y++ = (val >> 4) & 0xFFC0;
99 }
100
101 psrc += stride;
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102 y += pic->linesize[0] / 2 - avctx->width;
103 u += pic->linesize[1] / 2 - avctx->width / 2;
104 v += pic->linesize[2] / 2 - avctx->width / 2;
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105 }
106
107 *data_size = sizeof(AVFrame);
108 *(AVFrame*)data = *avctx->coded_frame;
109
110 return avpkt->size;
111}
112
113static av_cold int decode_close(AVCodecContext *avctx)
114{
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115 AVFrame *pic = avctx->coded_frame;
116 if (pic->data[0])
117 avctx->release_buffer(avctx, pic);
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118 av_freep(&avctx->coded_frame);
119
120 return 0;
121}
122
d36beb3f 123AVCodec ff_v210_decoder = {
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124 .name = "v210",
125 .type = AVMEDIA_TYPE_VIDEO,
126 .id = CODEC_ID_V210,
127 .init = decode_init,
128 .close = decode_close,
129 .decode = decode_frame,
130 .capabilities = CODEC_CAP_DR1,
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131 .long_name = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"),
132};