v210dec.c 3.51 KB
Newer Older
1 2 3 4 5 6
/*
 * V210 decoder
 *
 * Copyright (C) 2009 Michael Niedermayer <michaelni@gmx.at>
 * Copyright (c) 2009 Baptiste Coudurier <baptiste dot coudurier at gmail dot com>
 *
7
 * This file is part of Libav.
8
 *
9
 * Libav is free software; you can redistribute it and/or
10 11 12 13
 * 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.
 *
14
 * Libav is distributed in the hope that it will be useful,
15 16 17 18 19
 * 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
20
 * License along with Libav; if not, write to the Free Software
21 22 23 24
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "avcodec.h"
25
#include "internal.h"
26
#include "libavutil/bswap.h"
27 28
#include "libavutil/internal.h"
#include "libavutil/mem.h"
29 30 31 32 33

static av_cold int decode_init(AVCodecContext *avctx)
{
    if (avctx->width & 1) {
        av_log(avctx, AV_LOG_ERROR, "v210 needs even width\n");
34
        return AVERROR_INVALIDDATA;
35
    }
36
    avctx->pix_fmt             = AV_PIX_FMT_YUV422P10;
37 38 39 40 41
    avctx->bits_per_raw_sample = 10;

    return 0;
}

42
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
Diego Biurrun's avatar
Diego Biurrun committed
43
                        AVPacket *avpkt)
44
{
45
    int h, w, ret;
46
    AVFrame *pic = data;
47 48 49 50 51 52 53
    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 (avpkt->size < stride * avctx->height) {
        av_log(avctx, AV_LOG_ERROR, "packet too small\n");
54
        return AVERROR_INVALIDDATA;
55 56
    }

57
    if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
58
        return ret;
59

60 61 62
    y = (uint16_t*)pic->data[0];
    u = (uint16_t*)pic->data[1];
    v = (uint16_t*)pic->data[2];
63
    pic->pict_type = AV_PICTURE_TYPE_I;
64 65
    pic->key_frame = 1;

Diego Biurrun's avatar
Diego Biurrun committed
66 67
#define READ_PIXELS(a, b, c)         \
    do {                             \
68 69 70 71
        val  = av_le2ne32(*src++);   \
        *a++ =  val & 0x3FF;         \
        *b++ = (val >> 10) & 0x3FF;  \
        *c++ = (val >> 20) & 0x3FF;  \
72
    } while (0)
73 74

    for (h = 0; h < avctx->height; h++) {
75
        const uint32_t *src = (const uint32_t*)psrc;
76 77 78 79 80 81 82 83 84 85
        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);

86
            val  = av_le2ne32(*src++);
87
            *y++ =  val & 0x3FF;
88 89
        }
        if (w < avctx->width - 3) {
90 91
            *u++ = (val >> 10) & 0x3FF;
            *y++ = (val >> 20) & 0x3FF;
92

93
            val  = av_le2ne32(*src++);
94 95
            *v++ =  val & 0x3FF;
            *y++ = (val >> 10) & 0x3FF;
96 97 98
        }

        psrc += stride;
Diego Biurrun's avatar
Diego Biurrun committed
99 100 101
        y += pic->linesize[0] / 2 - avctx->width;
        u += pic->linesize[1] / 2 - avctx->width / 2;
        v += pic->linesize[2] / 2 - avctx->width / 2;
102 103
    }

104
    *got_frame      = 1;
105 106 107 108

    return avpkt->size;
}

109
AVCodec ff_v210_decoder = {
110
    .name           = "v210",
111
    .long_name      = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"),
112
    .type           = AVMEDIA_TYPE_VIDEO,
113
    .id             = AV_CODEC_ID_V210,
114 115
    .init           = decode_init,
    .decode         = decode_frame,
116
    .capabilities   = AV_CODEC_CAP_DR1,
117
};