aboutsummaryrefslogtreecommitdiffstats
path: root/libavcodec/v210dec.c
blob: 61e9566c8778beaaddf02bc0c052118d270aa97a (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
/*
 * V210 decoder
 *
 * Copyright (C) 2009 Michael Niedermayer <michaelni@gmx.at>
 * Copyright (c) 2009 Baptiste Coudurier <baptiste dot coudurier at gmail dot com>
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "avcodec.h"
#include "libavutil/bswap.h"

static av_cold int decode_init(AVCodecContext *avctx)
{
    if (avctx->width & 1) {
        av_log(avctx, AV_LOG_ERROR, "v210 needs even width\n");
        return -1;
    }
    avctx->pix_fmt             = PIX_FMT_YUV422P16;
    avctx->bits_per_raw_sample = 10;

    avctx->coded_frame         = avcodec_alloc_frame();

    return 0;
}

static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
                        AVPacket *avpkt)
{
    int h, w;
    AVFrame *pic = avctx->coded_frame;
    const uint8_t *psrc = avpkt->data;
    uint16_t *y, *u, *v;
    int aligned_width = ((avctx->width + 47) / 48) * 48;
    int stride = aligned_width * 8 / 3;

    if (pic->data[0])
        avctx->release_buffer(avctx, pic);

    if (avpkt->size < stride * avctx->height) {
        av_log(avctx, AV_LOG_ERROR, "packet too small\n");
        return -1;
    }

    pic->reference = 0;
    if (avctx->get_buffer(avctx, pic) < 0)
        return -1;

    y = (uint16_t*)pic->data[0];
    u = (uint16_t*)pic->data[1];
    v = (uint16_t*)pic->data[2];
    pic->pict_type = FF_I_TYPE;
    pic->key_frame = 1;

#define READ_PIXELS(a, b, c)         \
    do {                             \
        val  = av_le2ne32(*src++);     \
        *a++ =  val <<  6;           \
        *b++ = (val >>  4) & 0xFFC0; \
        *c++ = (val >> 14) & 0xFFC0; \
    } while (0)

    for (h = 0; h < avctx->height; h++) {
        const uint32_t *src = (const uint32_t*)psrc;
        uint32_t val;
        for (w = 0; w < avctx->width - 5; w += 6) {
            READ_PIXELS(u, y, v);
            READ_PIXELS(y, u, y);
            READ_PIXELS(v, y, u);
            READ_PIXELS(y, v, y);
        }
        if (w < avctx->width - 1) {
            READ_PIXELS(u, y, v);

            val  = av_le2ne32(*src++);
            *y++ =  val <<  6;
        }
        if (w < avctx->width - 3) {
            *u++ = (val >>  4) & 0xFFC0;
            *y++ = (val >> 14) & 0xFFC0;

            val  = av_le2ne32(*src++);
            *v++ =  val <<  6;
            *y++ = (val >>  4) & 0xFFC0;
        }

        psrc += stride;
        y += pic->linesize[0] / 2 - avctx->width;
        u += pic->linesize[1] / 2 - avctx->width / 2;
        v += pic->linesize[2] / 2 - avctx->width / 2;
    }

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

    return avpkt->size;
}

static av_cold int decode_close(AVCodecContext *avctx)
{
    AVFrame *pic = avctx->coded_frame;
    if (pic->data[0])
        avctx->release_buffer(avctx, pic);
    av_freep(&avctx->coded_frame);

    return 0;
}

AVCodec v210_decoder = {
    "v210",
    AVMEDIA_TYPE_VIDEO,
    CODEC_ID_V210,
    0,
    decode_init,
    NULL,
    decode_close,
    decode_frame,
    CODEC_CAP_DR1,
    .long_name = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"),
};