summaryrefslogtreecommitdiffstats
path: root/libavcodec/cdxl.c
blob: 80a367163d7ef94ed47b82981ab2befa20ebd7da (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
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
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
/*
 * CDXL video decoder
 * Copyright (c) 2011-2012 Paul B Mahol
 *
 * 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
 */

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

#define BIT_PLANAR   0x00
#define BYTE_PLANAR  0x20
#define CHUNKY       0x40
#define BIT_LINE     0x80
#define BYTE_LINE    0xC0

typedef struct {
    AVCodecContext *avctx;
    int            bpp;
    int            format;
    int            padded_bits;
    const uint8_t  *palette;
    int            palette_size;
    const uint8_t  *video;
    int            video_size;
    uint8_t        *new_video;
    int            new_video_size;
} CDXLVideoContext;

static av_cold int cdxl_decode_init(AVCodecContext *avctx)
{
    CDXLVideoContext *c = avctx->priv_data;

    c->new_video_size = 0;
    c->avctx          = avctx;

    return 0;
}

static void import_palette(CDXLVideoContext *c, uint32_t *new_palette)
{
    int i;

    for (i = 0; i < c->palette_size / 2; i++) {
        unsigned rgb = AV_RB16(&c->palette[i * 2]);
        unsigned r   = ((rgb >> 8) & 0xF) * 0x11;
        unsigned g   = ((rgb >> 4) & 0xF) * 0x11;
        unsigned b   =  (rgb       & 0xF) * 0x11;
        AV_WN32(&new_palette[i], (r << 16) | (g << 8) | b);
    }
}

static void bitplanar2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
{
    GetBitContext gb;
    int x, y, plane;

    init_get_bits(&gb, c->video, c->video_size * 8);
    for (plane = 0; plane < c->bpp; plane++) {
        for (y = 0; y < c->avctx->height; y++) {
            for (x = 0; x < c->avctx->width; x++)
                out[linesize * y + x] |= get_bits1(&gb) << plane;
            skip_bits(&gb, c->padded_bits);
        }
    }
}

static void bitline2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
{
    GetBitContext  gb;
    int x, y, plane;

    init_get_bits(&gb, c->video, c->video_size * 8);
    for (y = 0; y < c->avctx->height; y++) {
        for (plane = 0; plane < c->bpp; plane++) {
            for (x = 0; x < c->avctx->width; x++)
                out[linesize * y + x] |= get_bits1(&gb) << plane;
            skip_bits(&gb, c->padded_bits);
        }
    }
}

static void import_format(CDXLVideoContext *c, int linesize, uint8_t *out)
{
    memset(out, 0, linesize * c->avctx->height);

    switch (c->format) {
    case BIT_PLANAR:
        bitplanar2chunky(c, linesize, out);
        break;
    case BIT_LINE:
        bitline2chunky(c, linesize, out);
        break;
    }
}

static void cdxl_decode_rgb(CDXLVideoContext *c, AVFrame *frame)
{
    uint32_t *new_palette = (uint32_t *)frame->data[1];

    import_palette(c, new_palette);
    import_format(c, frame->linesize[0], frame->data[0]);
}

static void cdxl_decode_ham6(CDXLVideoContext *c, AVFrame *frame)
{
    AVCodecContext *avctx = c->avctx;
    uint32_t new_palette[16], r, g, b;
    uint8_t *ptr, *out, index, op;
    int x, y;

    ptr = c->new_video;
    out = frame->data[0];

    import_palette(c, new_palette);
    import_format(c, avctx->width, c->new_video);

    for (y = 0; y < avctx->height; y++) {
        r = new_palette[0] & 0xFF0000;
        g = new_palette[0] & 0xFF00;
        b = new_palette[0] & 0xFF;
        for (x = 0; x < avctx->width; x++) {
            index  = *ptr++;
            op     = index >> 4;
            index &= 15;
            switch (op) {
            case 0:
                r = new_palette[index] & 0xFF0000;
                g = new_palette[index] & 0xFF00;
                b = new_palette[index] & 0xFF;
                break;
            case 1:
                b = index * 0x11;
                break;
            case 2:
                r = index * 0x11 << 16;
                break;
            case 3:
                g = index * 0x11 << 8;
                break;
            }
            AV_WL24(out + x * 3, r | g | b);
        }
        out += frame->linesize[0];
    }
}

static void cdxl_decode_ham8(CDXLVideoContext *c, AVFrame *frame)
{
    AVCodecContext *avctx = c->avctx;
    uint32_t new_palette[64], r, g, b;
    uint8_t *ptr, *out, index, op;
    int x, y;

    ptr = c->new_video;
    out = frame->data[0];

    import_palette(c, new_palette);
    import_format(c, avctx->width, c->new_video);

    for (y = 0; y < avctx->height; y++) {
        r = new_palette[0] & 0xFF0000;
        g = new_palette[0] & 0xFF00;
        b = new_palette[0] & 0xFF;
        for (x = 0; x < avctx->width; x++) {
            index  = *ptr++;
            op     = index >> 6;
            index &= 63;
            switch (op) {
            case 0:
                r = new_palette[index] & 0xFF0000;
                g = new_palette[index] & 0xFF00;
                b = new_palette[index] & 0xFF;
                break;
            case 1:
                b = (index <<  2) | (b & 3);
                break;
            case 2:
                r = (index << 18) | (r & (3 << 16));
                break;
            case 3:
                g = (index << 10) | (g & (3 << 8));
                break;
            }
            AV_WL24(out + x * 3, r | g | b);
        }
        out += frame->linesize[0];
    }
}

static int cdxl_decode_frame(AVCodecContext *avctx, void *data,
                             int *got_frame, AVPacket *pkt)
{
    CDXLVideoContext *c = avctx->priv_data;
    AVFrame * const p = data;
    int ret, w, h, encoding, aligned_width, buf_size = pkt->size;
    const uint8_t *buf = pkt->data;

    if (buf_size < 32)
        return AVERROR_INVALIDDATA;
    encoding        = buf[1] & 7;
    c->format       = buf[1] & 0xE0;
    w               = AV_RB16(&buf[14]);
    h               = AV_RB16(&buf[16]);
    c->bpp          = buf[19];
    c->palette_size = AV_RB16(&buf[20]);
    c->palette      = buf + 32;
    c->video        = c->palette + c->palette_size;
    c->video_size   = buf_size - c->palette_size - 32;

    if (c->palette_size > 512)
        return AVERROR_INVALIDDATA;
    if (buf_size < c->palette_size + 32)
        return AVERROR_INVALIDDATA;
    if (c->bpp < 1)
        return AVERROR_INVALIDDATA;
    if (c->format != BIT_PLANAR && c->format != BIT_LINE) {
        avpriv_request_sample(avctx, "Pixel format 0x%0x", c->format);
        return AVERROR_PATCHWELCOME;
    }

    if ((ret = ff_set_dimensions(avctx, w, h)) < 0)
        return ret;

    aligned_width = FFALIGN(c->avctx->width, 16);
    c->padded_bits  = aligned_width - c->avctx->width;
    if (c->video_size < aligned_width * avctx->height * c->bpp / 8)
        return AVERROR_INVALIDDATA;
    if (!encoding && c->palette_size && c->bpp <= 8) {
        avctx->pix_fmt = AV_PIX_FMT_PAL8;
    } else if (encoding == 1 && (c->bpp == 6 || c->bpp == 8)) {
        if (c->palette_size != (1 << (c->bpp - 1)))
            return AVERROR_INVALIDDATA;
        avctx->pix_fmt = AV_PIX_FMT_BGR24;
    } else {
        avpriv_request_sample(avctx, "Encoding %d and bpp %d",
                              encoding, c->bpp);
        return AVERROR_PATCHWELCOME;
    }

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

    if (encoding) {
        av_fast_padded_malloc(&c->new_video, &c->new_video_size,
                              h * w + FF_INPUT_BUFFER_PADDING_SIZE);
        if (!c->new_video)
            return AVERROR(ENOMEM);
        if (c->bpp == 8)
            cdxl_decode_ham8(c, p);
        else
            cdxl_decode_ham6(c, p);
    } else {
        cdxl_decode_rgb(c, p);
    }
    *got_frame = 1;

    return buf_size;
}

static av_cold int cdxl_decode_end(AVCodecContext *avctx)
{
    CDXLVideoContext *c = avctx->priv_data;

    av_free(c->new_video);

    return 0;
}

AVCodec ff_cdxl_decoder = {
    .name           = "cdxl",
    .long_name      = NULL_IF_CONFIG_SMALL("Commodore CDXL video"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_CDXL,
    .priv_data_size = sizeof(CDXLVideoContext),
    .init           = cdxl_decode_init,
    .close          = cdxl_decode_end,
    .decode         = cdxl_decode_frame,
    .capabilities   = CODEC_CAP_DR1,
};
OpenPOWER on IntegriCloud