Statistics
| Branch: | Revision:

ffmpeg / libavcodec / v210dec.c @ 2912e87a

History | View | Annotate | Download (3.71 KB)

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 Libav.
8
 *
9
 * Libav 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
 * Libav 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 Libav; 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
    avctx->pix_fmt             = PIX_FMT_YUV422P16;
34
    avctx->bits_per_raw_sample = 10;
35

    
36
    avctx->coded_frame         = avcodec_alloc_frame();
37

    
38
    return 0;
39
}
40

    
41
static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
42
                        AVPacket *avpkt)
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

    
63
    y = (uint16_t*)pic->data[0];
64
    u = (uint16_t*)pic->data[1];
65
    v = (uint16_t*)pic->data[2];
66
    pic->pict_type = FF_I_TYPE;
67
    pic->key_frame = 1;
68

    
69
#define READ_PIXELS(a, b, c)         \
70
    do {                             \
71
        val  = av_le2ne32(*src++);     \
72
        *a++ =  val <<  6;           \
73
        *b++ = (val >>  4) & 0xFFC0; \
74
        *c++ = (val >> 14) & 0xFFC0; \
75
    } while (0)
76

    
77
    for (h = 0; h < avctx->height; h++) {
78
        const uint32_t *src = (const uint32_t*)psrc;
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

    
89
            val  = av_le2ne32(*src++);
90
            *y++ =  val <<  6;
91
        }
92
        if (w < avctx->width - 3) {
93
            *u++ = (val >>  4) & 0xFFC0;
94
            *y++ = (val >> 14) & 0xFFC0;
95

    
96
            val  = av_le2ne32(*src++);
97
            *v++ =  val <<  6;
98
            *y++ = (val >>  4) & 0xFFC0;
99
        }
100

    
101
        psrc += stride;
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;
105
    }
106

    
107
    *data_size = sizeof(AVFrame);
108
    *(AVFrame*)data = *avctx->coded_frame;
109

    
110
    return avpkt->size;
111
}
112

    
113
static av_cold int decode_close(AVCodecContext *avctx)
114
{
115
    AVFrame *pic = avctx->coded_frame;
116
    if (pic->data[0])
117
        avctx->release_buffer(avctx, pic);
118
    av_freep(&avctx->coded_frame);
119

    
120
    return 0;
121
}
122

    
123
AVCodec ff_v210_decoder = {
124
    "v210",
125
    AVMEDIA_TYPE_VIDEO,
126
    CODEC_ID_V210,
127
    0,
128
    decode_init,
129
    NULL,
130
    decode_close,
131
    decode_frame,
132
    CODEC_CAP_DR1,
133
    .long_name = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"),
134
};