aboutsummaryrefslogtreecommitdiffstats
path: root/libavcodec/kgv1dec.c
blob: 1774f36c3b47465c6afd030e6d2eee3c4db224f6 (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
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
/*
 * Kega Game Video (KGV1) decoder
 * Copyright (c) 2010 Daniel Verkamp
 *
 * This file is part of Libav.
 *
 * Libav 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.
 *
 * Libav 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 Libav; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * Kega Game Video decoder
 */

#include "libavutil/common.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/imgutils.h"
#include "avcodec.h"
#include "internal.h"

typedef struct {
    AVCodecContext *avctx;
    AVFrame prev;
} KgvContext;

static void decode_flush(AVCodecContext *avctx)
{
    KgvContext * const c = avctx->priv_data;

    av_frame_unref(&c->prev);
}

static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
                        AVPacket *avpkt)
{
    AVFrame *frame = data;
    const uint8_t *buf = avpkt->data;
    const uint8_t *buf_end = buf + avpkt->size;
    KgvContext * const c = avctx->priv_data;
    int offsets[8];
    uint16_t *out, *prev;
    int outcnt = 0, maxcnt;
    int w, h, i, res;

    if (avpkt->size < 2)
        return AVERROR_INVALIDDATA;

    w = (buf[0] + 1) * 8;
    h = (buf[1] + 1) * 8;
    buf += 2;

    if ((res = av_image_check_size(w, h, 0, avctx)) < 0)
        return res;

    if (w != avctx->width || h != avctx->height) {
        av_frame_unref(&c->prev);
        avcodec_set_dimensions(avctx, w, h);
    }

    maxcnt = w * h;

    if ((res = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
        return res;
    out  = (uint16_t *) frame->data[0];
    if (c->prev.data[0]) {
        prev = (uint16_t *) c->prev.data[0];
    } else {
        prev = NULL;
    }

    for (i = 0; i < 8; i++)
        offsets[i] = -1;

    while (outcnt < maxcnt && buf_end - 2 > buf) {
        int code = AV_RL16(buf);
        buf += 2;

        if (!(code & 0x8000)) {
            out[outcnt++] = code; // rgb555 pixel coded directly
        } else {
            int count;
            int inp_off;
            uint16_t *inp;

            if ((code & 0x6000) == 0x6000) {
                // copy from previous frame
                int oidx = (code >> 10) & 7;
                int start;

                count = (code & 0x3FF) + 3;

                if (offsets[oidx] < 0) {
                    if (buf_end - 3 < buf)
                        break;
                    offsets[oidx] = AV_RL24(buf);
                    buf += 3;
                }

                start = (outcnt + offsets[oidx]) % maxcnt;

                if (maxcnt - start < count)
                    break;

                if (!prev) {
                    av_log(avctx, AV_LOG_ERROR,
                           "Frame reference does not exist\n");
                    break;
                }

                inp = prev;
                inp_off = start;
            } else {
                // copy from earlier in this frame
                int offset = (code & 0x1FFF) + 1;

                if (!(code & 0x6000)) {
                    count = 2;
                } else if ((code & 0x6000) == 0x2000) {
                    count = 3;
                } else {
                    if (buf_end - 1 < buf)
                        break;
                    count = 4 + *buf++;
                }

                if (outcnt < offset)
                    break;

                inp = out;
                inp_off = outcnt - offset;
            }

            if (maxcnt - outcnt < count)
                break;

            for (i = inp_off; i < count + inp_off; i++) {
                out[outcnt++] = inp[i];
            }
        }
    }

    if (outcnt - maxcnt)
        av_log(avctx, AV_LOG_DEBUG, "frame finished with %d diff\n", outcnt - maxcnt);

    av_frame_unref(&c->prev);
    if ((res = av_frame_ref(&c->prev, frame)) < 0)
        return res;

    *got_frame = 1;

    return avpkt->size;
}

static av_cold int decode_init(AVCodecContext *avctx)
{
    KgvContext * const c = avctx->priv_data;

    c->avctx = avctx;
    avctx->pix_fmt = AV_PIX_FMT_RGB555;
    avctx->flags  |= CODEC_FLAG_EMU_EDGE;

    return 0;
}

static av_cold int decode_end(AVCodecContext *avctx)
{
    decode_flush(avctx);
    return 0;
}

AVCodec ff_kgv1_decoder = {
    .name           = "kgv1",
    .long_name      = NULL_IF_CONFIG_SMALL("Kega Game Video"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_KGV1,
    .priv_data_size = sizeof(KgvContext),
    .init           = decode_init,
    .close          = decode_end,
    .decode         = decode_frame,
    .flush          = decode_flush,
    .capabilities   = CODEC_CAP_DR1,
};