Statistics
| Branch: | Revision:

ffmpeg / libavcodec / loco.c @ bb54f6ab

History | View | Annotate | Download (8.66 KB)

1 9c7fb608 Mike Melanson
/*
2
 * LOCO codec
3
 * Copyright (c) 2005 Konstantin Shishkov
4
 *
5 b78e7197 Diego Biurrun
 * This file is part of FFmpeg.
6
 *
7
 * FFmpeg is free software; you can redistribute it and/or
8 9c7fb608 Mike Melanson
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
10 b78e7197 Diego Biurrun
 * version 2.1 of the License, or (at your option) any later version.
11 9c7fb608 Mike Melanson
 *
12 b78e7197 Diego Biurrun
 * FFmpeg is distributed in the hope that it will be useful,
13 9c7fb608 Mike Melanson
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
16
 *
17
 * You should have received a copy of the GNU Lesser General Public
18 b78e7197 Diego Biurrun
 * License along with FFmpeg; if not, write to the Free Software
19 5509bffa Diego Biurrun
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 9c7fb608 Mike Melanson
 *
21
 */
22 115329f1 Diego Biurrun
23 9c7fb608 Mike Melanson
/**
24
 * @file loco.c
25
 * LOCO codec.
26
 */
27 115329f1 Diego Biurrun
28 9c7fb608 Mike Melanson
#include "avcodec.h"
29
#include "common.h"
30
#include "bitstream.h"
31
#include "golomb.h"
32
33 29846f48 Kostya Shishkov
enum LOCO_MODE {LOCO_UNKN=0, LOCO_CYUY2=-1, LOCO_CRGB=-2, LOCO_CRGBA=-3, LOCO_CYV12=-4,
34 9c7fb608 Mike Melanson
 LOCO_YUY2=1, LOCO_UYVY=2, LOCO_RGB=3, LOCO_RGBA=4, LOCO_YV12=5};
35
36
typedef struct LOCOContext{
37
    AVCodecContext *avctx;
38
    AVFrame pic;
39
    int lossy;
40
    int mode;
41
} LOCOContext;
42
43
typedef struct RICEContext{
44
    GetBitContext gb;
45
    int save, run, run2; /* internal rice decoder state */
46
    int sum, count; /* sum and count for getting rice parameter */
47 42ebf67d Michael Niedermayer
    int lossy;
48 9c7fb608 Mike Melanson
}RICEContext;
49
50
static int loco_get_rice_param(RICEContext *r)
51
{
52
    int cnt = 0;
53
    int val = r->count;
54 115329f1 Diego Biurrun
55 9c7fb608 Mike Melanson
    while(r->sum > val && cnt < 9) {
56
        val <<= 1;
57
        cnt++;
58
    }
59 115329f1 Diego Biurrun
60 9c7fb608 Mike Melanson
    return cnt;
61
}
62
63
static inline void loco_update_rice_param(RICEContext *r, int val)
64
{
65
    r->sum += val;
66
    r->count++;
67 115329f1 Diego Biurrun
68 9c7fb608 Mike Melanson
    if(r->count == 16) {
69
        r->sum >>= 1;
70
        r->count >>= 1;
71
    }
72
}
73
74
static inline int loco_get_rice(RICEContext *r)
75
{
76
    int v;
77
    if (r->run > 0) { /* we have zero run */
78
        r->run--;
79 42ebf67d Michael Niedermayer
        loco_update_rice_param(r, 0);
80 9c7fb608 Mike Melanson
        return 0;
81
    }
82 42ebf67d Michael Niedermayer
    v = get_ur_golomb_jpegls(&r->gb, loco_get_rice_param(r), INT_MAX, 0);
83
    loco_update_rice_param(r, (v+1)>>1);
84 9c7fb608 Mike Melanson
    if (!v) {
85
        if (r->save >= 0) {
86 42ebf67d Michael Niedermayer
            r->run = get_ur_golomb_jpegls(&r->gb, 2, INT_MAX, 0);
87 9c7fb608 Mike Melanson
            if(r->run > 1)
88
                r->save += r->run + 1;
89
            else
90
                r->save -= 3;
91
        }
92
        else
93
            r->run2++;
94 42ebf67d Michael Niedermayer
    } else {
95
        v = ((v>>1) + r->lossy) ^ -(v&1);
96
        if (r->run2 > 0) {
97
            if (r->run2 > 2)
98
                r->save += r->run2;
99
            else
100
                r->save -= 3;
101
            r->run2 = 0;
102
        }
103 9c7fb608 Mike Melanson
    }
104 115329f1 Diego Biurrun
105 9c7fb608 Mike Melanson
    return v;
106
}
107
108
/* LOCO main predictor - LOCO-I/JPEG-LS predictor */
109
static inline int loco_predict(uint8_t* data, int stride, int step)
110
{
111
    int a, b, c;
112 115329f1 Diego Biurrun
113 9c7fb608 Mike Melanson
    a = data[-stride];
114
    b = data[-step];
115
    c = data[-stride - step];
116 115329f1 Diego Biurrun
117 42ebf67d Michael Niedermayer
    return mid_pred(a, a + b - c, b);
118 9c7fb608 Mike Melanson
}
119
120
static int loco_decode_plane(LOCOContext *l, uint8_t *data, int width, int height,
121
                             int stride, uint8_t *buf, int buf_size, int step)
122
{
123
    RICEContext rc;
124
    int val;
125
    int i, j;
126 115329f1 Diego Biurrun
127 9c7fb608 Mike Melanson
    init_get_bits(&rc.gb, buf, buf_size*8);
128
    rc.save = 0;
129
    rc.run = 0;
130
    rc.run2 = 0;
131 115329f1 Diego Biurrun
    rc.lossy = l->lossy;
132
133 9c7fb608 Mike Melanson
    rc.sum = 8;
134
    rc.count = 1;
135 115329f1 Diego Biurrun
136 9c7fb608 Mike Melanson
    /* restore top left pixel */
137
    val = loco_get_rice(&rc);
138
    data[0] = 128 + val;
139
    /* restore top line */
140
    for (i = 1; i < width; i++) {
141
        val = loco_get_rice(&rc);
142
        data[i * step] = data[i * step - step] + val;
143
    }
144
    data += stride;
145
    for (j = 1; j < height; j++) {
146
        /* restore left column */
147
        val = loco_get_rice(&rc);
148
        data[0] = data[-stride] + val;
149
        /* restore all other pixels */
150
        for (i = 1; i < width; i++) {
151
            val = loco_get_rice(&rc);
152
            data[i * step] = loco_predict(&data[i * step], stride, step) + val;
153
        }
154
        data += stride;
155
    }
156 115329f1 Diego Biurrun
157 9c7fb608 Mike Melanson
    return ((get_bits_count(&rc.gb) + 7) >> 3);
158
}
159
160 115329f1 Diego Biurrun
static int decode_frame(AVCodecContext *avctx,
161 9c7fb608 Mike Melanson
                        void *data, int *data_size,
162
                        uint8_t *buf, int buf_size)
163
{
164
    LOCOContext * const l = avctx->priv_data;
165
    AVFrame * const p= (AVFrame*)&l->pic;
166
    int decoded;
167
168
    if(p->data[0])
169
        avctx->release_buffer(avctx, p);
170
171
    p->reference = 0;
172
    if(avctx->get_buffer(avctx, p) < 0){
173
        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
174
        return -1;
175
    }
176
    p->key_frame = 1;
177
178
    switch(l->mode) {
179
    case LOCO_CYUY2: case LOCO_YUY2: case LOCO_UYVY:
180
        decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height,
181
                                    p->linesize[0], buf, buf_size, 1);
182
        buf += decoded; buf_size -= decoded;
183
        decoded = loco_decode_plane(l, p->data[1], avctx->width / 2, avctx->height,
184
                                    p->linesize[1], buf, buf_size, 1);
185
        buf += decoded; buf_size -= decoded;
186
        decoded = loco_decode_plane(l, p->data[2], avctx->width / 2, avctx->height,
187
                                    p->linesize[2], buf, buf_size, 1);
188
        break;
189
    case LOCO_CYV12: case LOCO_YV12:
190
        decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height,
191
                                    p->linesize[0], buf, buf_size, 1);
192
        buf += decoded; buf_size -= decoded;
193
        decoded = loco_decode_plane(l, p->data[2], avctx->width / 2, avctx->height / 2,
194
                                    p->linesize[2], buf, buf_size, 1);
195 76d6abc1 Roberto Togni
        buf += decoded; buf_size -= decoded;
196
        decoded = loco_decode_plane(l, p->data[1], avctx->width / 2, avctx->height / 2,
197
                                    p->linesize[1], buf, buf_size, 1);
198 9c7fb608 Mike Melanson
        break;
199
    case LOCO_CRGB: case LOCO_RGB:
200 a18ba908 Jindřich Makovička
        decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1), avctx->width, avctx->height,
201
                                    -p->linesize[0], buf, buf_size, 3);
202 9c7fb608 Mike Melanson
        buf += decoded; buf_size -= decoded;
203 a18ba908 Jindřich Makovička
        decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 1, avctx->width, avctx->height,
204
                                    -p->linesize[0], buf, buf_size, 3);
205 9c7fb608 Mike Melanson
        buf += decoded; buf_size -= decoded;
206 a18ba908 Jindřich Makovička
        decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 2, avctx->width, avctx->height,
207
                                    -p->linesize[0], buf, buf_size, 3);
208 9c7fb608 Mike Melanson
        break;
209
    case LOCO_RGBA:
210
        decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height,
211
                                    p->linesize[0], buf, buf_size, 4);
212
        buf += decoded; buf_size -= decoded;
213
        decoded = loco_decode_plane(l, p->data[0] + 1, avctx->width, avctx->height,
214
                                    p->linesize[0], buf, buf_size, 4);
215
        buf += decoded; buf_size -= decoded;
216
        decoded = loco_decode_plane(l, p->data[0] + 2, avctx->width, avctx->height,
217
                                    p->linesize[0], buf, buf_size, 4);
218
        buf += decoded; buf_size -= decoded;
219
        decoded = loco_decode_plane(l, p->data[0] + 3, avctx->width, avctx->height,
220
                                    p->linesize[0], buf, buf_size, 4);
221
        break;
222
    }
223
224
    *data_size = sizeof(AVFrame);
225
    *(AVFrame*)data = l->pic;
226 115329f1 Diego Biurrun
227 9c7fb608 Mike Melanson
    return buf_size;
228
}
229
230
static int decode_init(AVCodecContext *avctx){
231
    LOCOContext * const l = avctx->priv_data;
232
    int version;
233
234
    l->avctx = avctx;
235
    if (avctx->extradata_size < 12) {
236
        av_log(avctx, AV_LOG_ERROR, "Extradata size must be >= 12 instead of %i\n",
237
               avctx->extradata_size);
238
        return -1;
239
    }
240
    version = LE_32(avctx->extradata);
241
    switch(version) {
242
    case 1:
243
        l->lossy = 0;
244
        break;
245
    case 2:
246
        l->lossy = LE_32(avctx->extradata + 8);
247
        break;
248
    default:
249
        l->lossy = LE_32(avctx->extradata + 8);
250
        av_log(avctx, AV_LOG_INFO, "This is LOCO codec version %i, please upload file for study\n", version);
251
    }
252 115329f1 Diego Biurrun
253 9c7fb608 Mike Melanson
    l->mode = LE_32(avctx->extradata + 4);
254
    switch(l->mode) {
255
    case LOCO_CYUY2: case LOCO_YUY2: case LOCO_UYVY:
256
        avctx->pix_fmt = PIX_FMT_YUV422P;
257
        break;
258
    case LOCO_CRGB: case LOCO_RGB:
259
        avctx->pix_fmt = PIX_FMT_BGR24;
260
        break;
261
    case LOCO_CYV12: case LOCO_YV12:
262
        avctx->pix_fmt = PIX_FMT_YUV420P;
263
        break;
264 29846f48 Kostya Shishkov
    case LOCO_CRGBA: case LOCO_RGBA:
265 9c7fb608 Mike Melanson
        avctx->pix_fmt = PIX_FMT_RGBA32;
266
        break;
267
    default:
268
        av_log(avctx, AV_LOG_INFO, "Unknown colorspace, index = %i\n", l->mode);
269
        return -1;
270
    }
271 42ebf67d Michael Niedermayer
    if(avctx->debug & FF_DEBUG_PICT_INFO)
272
        av_log(avctx, AV_LOG_INFO, "lossy:%i, version:%i, mode: %i\n", l->lossy, version, l->mode);
273 9c7fb608 Mike Melanson
274
    return 0;
275
}
276
277
AVCodec loco_decoder = {
278
    "loco",
279
    CODEC_TYPE_VIDEO,
280
    CODEC_ID_LOCO,
281
    sizeof(LOCOContext),
282
    decode_init,
283
    NULL,
284
    NULL,
285
    decode_frame,
286
    CODEC_CAP_DR1,
287
};