summaryrefslogtreecommitdiffstats
path: root/libavcodec/frwu.c
blob: 43feb012f2498e797e6a844dfa610ded1f8de0ff (plain)
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
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
/*
 * Forward Uncompressed
 *
 * Copyright (c) 2009 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
 *
 * 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 "bytestream.h"
#include "internal.h"
#include "libavutil/opt.h"

typedef struct {
    AVClass *av_class;
    int change_field_order;
} FRWUContext;

static av_cold int decode_init(AVCodecContext *avctx)
{
    if (avctx->width & 1) {
        av_log(avctx, AV_LOG_ERROR, "frwu needs even width\n");
        return AVERROR(EINVAL);
    }
    avctx->pix_fmt = AV_PIX_FMT_UYVY422;

    avctx->coded_frame = avcodec_alloc_frame();
    if (!avctx->coded_frame)
        return AVERROR(ENOMEM);

    return 0;
}

static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
                        AVPacket *avpkt)
{
    FRWUContext *s = avctx->priv_data;
    int field, ret;
    AVFrame *pic = avctx->coded_frame;
    const uint8_t *buf = avpkt->data;
    const uint8_t *buf_end = buf + avpkt->size;

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

    if (avpkt->size < avctx->width * 2 * avctx->height + 4 + 2*8) {
        av_log(avctx, AV_LOG_ERROR, "Packet is too small.\n");
        return AVERROR_INVALIDDATA;
    }
    if (bytestream_get_le32(&buf) != MKTAG('F', 'R', 'W', '1')) {
        av_log(avctx, AV_LOG_ERROR, "incorrect marker\n");
        return AVERROR_INVALIDDATA;
    }

    pic->reference = 0;
    if ((ret = ff_get_buffer(avctx, pic)) < 0) {
        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
        return ret;
    }

    pic->pict_type = AV_PICTURE_TYPE_I;
    pic->key_frame = 1;

    for (field = 0; field < 2; field++) {
        int i;
        int field_h = (avctx->height + !field) >> 1;
        int field_size, min_field_size = avctx->width * 2 * field_h;
        uint8_t *dst = pic->data[0];
        if (buf_end - buf < 8)
            return AVERROR_INVALIDDATA;
        buf += 4; // flags? 0x80 == bottom field maybe?
        field_size = bytestream_get_le32(&buf);
        if (field_size < min_field_size) {
            av_log(avctx, AV_LOG_ERROR, "Field size %i is too small (required %i)\n", field_size, min_field_size);
            return AVERROR_INVALIDDATA;
        }
        if (buf_end - buf < field_size) {
            av_log(avctx, AV_LOG_ERROR, "Packet is too small, need %i, have %i\n", field_size, (int)(buf_end - buf));
            return AVERROR_INVALIDDATA;
        }
        if (field ^ s->change_field_order) {
            dst += pic->linesize[0];
        } else if (s->change_field_order) {
            dst += 2 * pic->linesize[0];
        }
        for (i = 0; i < field_h; i++) {
            if (s->change_field_order && field && i == field_h - 1)
                dst = pic->data[0];
            memcpy(dst, buf, avctx->width * 2);
            buf += avctx->width * 2;
            dst += pic->linesize[0] << 1;
        }
        buf += field_size - min_field_size;
    }

    *got_frame = 1;
    *(AVFrame*)data = *pic;

    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;
}

static const AVOption frwu_options[] = {
    {"change_field_order", "Change field order", offsetof(FRWUContext, change_field_order), FF_OPT_TYPE_INT,
     {.i64 = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM},
    {NULL}
};

static const AVClass frwu_class = {
    .class_name = "frwu Decoder",
    .item_name  = av_default_item_name,
    .option     = frwu_options,
    .version    = LIBAVUTIL_VERSION_INT,
};

AVCodec ff_frwu_decoder = {
    .name           = "frwu",
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_FRWU,
    .priv_data_size = sizeof(FRWUContext),
    .init           = decode_init,
    .close          = decode_close,
    .decode         = decode_frame,
    .capabilities   = CODEC_CAP_DR1,
    .long_name      = NULL_IF_CONFIG_SMALL("Forward Uncompressed"),
    .priv_class     = &frwu_class,
};
OpenPOWER on IntegriCloud