aboutsummaryrefslogtreecommitdiffhomepage
path: root/libmpcodecs/vf_geq.c
blob: ed855d1b7dde133ace30d0a22e46272a94e82cc9 (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
/*
 * Copyright (C) 2006 Michael Niedermayer <michaelni@gmx.at>
 *
 * This file is part of MPlayer.
 *
 * MPlayer is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * MPlayer 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with MPlayer; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <inttypes.h>

#include "config.h"

#include "mp_msg.h"
#include "cpudetect.h"

#include "img_format.h"
#include "mp_image.h"
#include "vf.h"

#include "libavcodec/avcodec.h"
#include "libavutil/eval.h"

struct vf_priv_s {
    AVExpr * e[3];
    int framenum;
    mp_image_t *mpi;
};

static int config(struct vf_instance *vf,
        int width, int height, int d_width, int d_height,
        unsigned int flags, unsigned int outfmt){
    return vf_next_config(vf,width,height,d_width,d_height,flags,outfmt);
}

static inline double getpix(struct vf_instance *vf, double x, double y, int plane){
    int xi, yi;
    mp_image_t *mpi= vf->priv->mpi;
    int stride= mpi->stride[plane];
    uint8_t *src=  mpi->planes[plane];
    xi=x= FFMIN(FFMAX(x, 0), (mpi->w >> (plane ? mpi->chroma_x_shift : 0))-1);
    yi=y= FFMIN(FFMAX(y, 0), (mpi->h >> (plane ? mpi->chroma_y_shift : 0))-1);

    x-=xi;
    y-=yi;

    return
     (1-y)*((1-x)*src[xi +  yi    * stride] + x*src[xi + 1 +  yi    * stride])
    +   y *((1-x)*src[xi + (yi+1) * stride] + x*src[xi + 1 + (yi+1) * stride]);
}

//FIXME cubic interpolate
//FIXME keep the last few frames
static double lum(void *vf, double x, double y){
    return getpix(vf, x, y, 0);
}

static double cb(void *vf, double x, double y){
    return getpix(vf, x, y, 1);
}

static double cr(void *vf, double x, double y){
    return getpix(vf, x, y, 2);
}

static int put_image(struct vf_instance *vf, mp_image_t *mpi, double pts){
    mp_image_t *dmpi;
    int x,y, plane;

    if(!(mpi->flags&MP_IMGFLAG_DIRECT)){
        // no DR, so get a new image! hope we'll get DR buffer:
        vf->dmpi=vf_get_image(vf->next,mpi->imgfmt, MP_IMGTYPE_TEMP,
                              MP_IMGFLAG_ACCEPT_STRIDE|MP_IMGFLAG_PREFER_ALIGNED_STRIDE,
                              mpi->w,mpi->h);
    }

    dmpi= vf->dmpi;
    vf->priv->mpi= mpi;

    vf_clone_mpi_attributes(dmpi, mpi);

    for(plane=0; plane<3; plane++){
        int w= mpi->w >> (plane ? mpi->chroma_x_shift : 0);
        int h= mpi->h >> (plane ? mpi->chroma_y_shift : 0);
        uint8_t *dst  = dmpi->planes[plane];
        int dst_stride= dmpi->stride[plane];
        double const_values[]={
            M_PI,
            M_E,
            0,
            0,
            w,
            h,
            vf->priv->framenum,
            w/(double)mpi->w,
            h/(double)mpi->h,
            0
        };
        if (!vf->priv->e[plane]) continue;
        for(y=0; y<h; y++){
            const_values[3]=y;
            for(x=0; x<w; x++){
                const_values[2]=x;
                dst[x + y * dst_stride] = av_eval_expr(vf->priv->e[plane],
                                                       const_values, vf);
            }
        }
    }

    vf->priv->framenum++;

    return vf_next_put_image(vf,dmpi, pts);
}

static void uninit(struct vf_instance *vf){
    av_free(vf->priv);
    vf->priv=NULL;
}

//===========================================================================//
static int vf_open(vf_instance_t *vf, char *args){
    char eq[3][2000] = { { 0 }, { 0 }, { 0 } };
    int plane, res;

    vf->config=config;
    vf->put_image=put_image;
//    vf->get_image=get_image;
    vf->uninit=uninit;
    vf->priv=av_malloc(sizeof(struct vf_priv_s));
    memset(vf->priv, 0, sizeof(struct vf_priv_s));

    if (args) sscanf(args, "%1999[^:]:%1999[^:]:%1999[^:]", eq[0], eq[1], eq[2]);

    if (!eq[1][0]) strncpy(eq[1], eq[0], sizeof(eq[0])-1);
    if (!eq[2][0]) strncpy(eq[2], eq[1], sizeof(eq[0])-1);

    for(plane=0; plane<3; plane++){
        const char * const const_names[]={
            "PI",
            "E",
            "X",
            "Y",
            "W",
            "H",
            "N",
            "SW",
            "SH",
            NULL
        };
        const char * const func2_names[]={
            "lum",
            "cb",
            "cr",
            "p",
            NULL
        };
        double (*func2[])(void *, double, double)={
            lum,
            cb,
            cr,
            plane==0 ? lum : (plane==1 ? cb : cr),
            NULL
        };
        res = av_parse_expr(&vf->priv->e[plane], eq[plane], const_names, NULL, NULL, func2_names, func2, 0, NULL);

        if (res < 0) {
            mp_msg(MSGT_VFILTER, MSGL_ERR, "geq: error loading equation `%s'\n", eq[plane]);
            return 0;
        }
    }

    return 1;
}

const vf_info_t vf_info_geq = {
    "generic equation filter",
    "geq",
    "Michael Niedermayer",
    "",
    vf_open,
    NULL
};