aboutsummaryrefslogtreecommitdiffstats
path: root/libavfilter/vf_vmafmotion.c
blob: a8adc6701931c331da51cca916d08ab2009b8149 (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
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
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
/*
 * Copyright (c) 2017 Ronald S. Bultje <rsbultje@gmail.com>
 * Copyright (c) 2017 Ashish Pratap Singh <ashk43712@gmail.com>
 *
 * 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
 */

/**
 * @file
 * Calculate VMAF Motion score.
 */

#include "libavutil/file_open.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "filters.h"
#include "formats.h"
#include "video.h"
#include "vmaf_motion.h"

#define BIT_SHIFT 15

static const float FILTER_5[5] = {
    0.054488685,
    0.244201342,
    0.402619947,
    0.244201342,
    0.054488685
};

typedef struct VMAFMotionContext {
    const AVClass *class;
    VMAFMotionData data;
    FILE *stats_file;
    char *stats_file_str;
} VMAFMotionContext;

#define OFFSET(x) offsetof(VMAFMotionContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

static const AVOption vmafmotion_options[] = {
    {"stats_file", "Set file where to store per-frame difference information", OFFSET(stats_file_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
    { NULL }
};

AVFILTER_DEFINE_CLASS(vmafmotion);

static uint64_t image_sad(const uint16_t *img1, const uint16_t *img2, int w,
                          int h, ptrdiff_t _img1_stride, ptrdiff_t _img2_stride)
{
    ptrdiff_t img1_stride = _img1_stride / sizeof(*img1);
    ptrdiff_t img2_stride = _img2_stride / sizeof(*img2);
    uint64_t sum = 0;
    int i, j;

    for (i = 0; i < h; i++) {
        for (j = 0; j < w; j++) {
            sum += abs(img1[j] - img2[j]);
        }
        img1 += img1_stride;
        img2 += img2_stride;
    }

    return sum;
}

static void convolution_x(const uint16_t *filter, int filt_w, const uint16_t *src,
                          uint16_t *dst, int w, int h, ptrdiff_t _src_stride,
                          ptrdiff_t _dst_stride)
{
    ptrdiff_t src_stride = _src_stride / sizeof(*src);
    ptrdiff_t dst_stride = _dst_stride / sizeof(*dst);
    int radius = filt_w / 2;
    int borders_left = radius;
    int borders_right = w - (filt_w - radius);
    int i, j, k;

    for (i = 0; i < h; i++) {
        for (j = 0; j < borders_left; j++) {
            int sum = 0;
            for (k = 0; k < filt_w; k++) {
                int j_tap = FFABS(j - radius + k);
                if (j_tap >= w) {
                    j_tap = w - (j_tap - w + 1);
                }
                sum += filter[k] * src[i * src_stride + j_tap];
            }
            dst[i * dst_stride + j] = sum >> BIT_SHIFT;
        }

        for (j = borders_left; j < borders_right; j++) {
            int sum = 0;
            for (k = 0; k < filt_w; k++) {
                sum += filter[k] * src[i * src_stride + j - radius + k];
            }
            dst[i * dst_stride + j] = sum >> BIT_SHIFT;
        }

        for (j = borders_right; j < w; j++) {
            int sum = 0;
            for (k = 0; k < filt_w; k++) {
                int j_tap = FFABS(j - radius + k);
                if (j_tap >= w) {
                    j_tap = w - (j_tap - w + 1);
                }
                sum += filter[k] * src[i * src_stride + j_tap];
            }
            dst[i * dst_stride + j] = sum >> BIT_SHIFT;
        }
    }
}

#define conv_y_fn(type, bits) \
static void convolution_y_##bits##bit(const uint16_t *filter, int filt_w, \
                                      const uint8_t *_src, uint16_t *dst, \
                                      int w, int h, ptrdiff_t _src_stride, \
                                      ptrdiff_t _dst_stride) \
{ \
    const type *src = (const type *) _src; \
    ptrdiff_t src_stride = _src_stride / sizeof(*src); \
    ptrdiff_t dst_stride = _dst_stride / sizeof(*dst); \
    int radius = filt_w / 2; \
    int borders_top = radius; \
    int borders_bottom = h - (filt_w - radius); \
    int i, j, k; \
    int sum = 0; \
    \
    for (i = 0; i < borders_top; i++) { \
        for (j = 0; j < w; j++) { \
            sum = 0; \
            for (k = 0; k < filt_w; k++) { \
                int i_tap = FFABS(i - radius + k); \
                if (i_tap >= h) { \
                    i_tap = h - (i_tap - h + 1); \
                } \
                sum += filter[k] * src[i_tap * src_stride + j]; \
            } \
            dst[i * dst_stride + j] = sum >> bits; \
        } \
    } \
    for (i = borders_top; i < borders_bottom; i++) { \
        for (j = 0; j < w; j++) { \
            sum = 0; \
            for (k = 0; k < filt_w; k++) { \
                sum += filter[k] * src[(i - radius + k) * src_stride + j]; \
            } \
            dst[i * dst_stride + j] = sum >> bits; \
        } \
    } \
    for (i = borders_bottom; i < h; i++) { \
        for (j = 0; j < w; j++) { \
            sum = 0; \
            for (k = 0; k < filt_w; k++) { \
                int i_tap = FFABS(i - radius + k); \
                if (i_tap >= h) { \
                    i_tap = h - (i_tap - h + 1); \
                } \
                sum += filter[k] * src[i_tap * src_stride + j]; \
            } \
            dst[i * dst_stride + j] = sum >> bits; \
        } \
    } \
}

conv_y_fn(uint8_t, 8)
conv_y_fn(uint16_t, 10)

static void vmafmotiondsp_init(VMAFMotionDSPContext *dsp, int bpp) {
    dsp->convolution_x = convolution_x;
    dsp->convolution_y = bpp == 10 ? convolution_y_10bit : convolution_y_8bit;
    dsp->sad = image_sad;
}

double ff_vmafmotion_process(VMAFMotionData *s, AVFrame *ref)
{
    double score;

    s->vmafdsp.convolution_y(s->filter, 5, ref->data[0], s->temp_data,
                             s->width, s->height, ref->linesize[0], s->stride);
    s->vmafdsp.convolution_x(s->filter, 5, s->temp_data, s->blur_data[0],
                             s->width, s->height, s->stride, s->stride);

    if (!s->nb_frames) {
        score = 0.0;
    } else {
        uint64_t sad = s->vmafdsp.sad(s->blur_data[1], s->blur_data[0],
                                      s->width, s->height, s->stride, s->stride);
        // the output score is always normalized to 8 bits
        score = (double) (sad * 1.0 / (s->width * s->height << (BIT_SHIFT - 8)));
    }

    FFSWAP(uint16_t *, s->blur_data[0], s->blur_data[1]);
    s->nb_frames++;
    s->motion_sum += score;

    return score;
}

static void set_meta(AVDictionary **metadata, const char *key, float d)
{
    char value[128];
    snprintf(value, sizeof(value), "%0.2f", d);
    av_dict_set(metadata, key, value, 0);
}

static void do_vmafmotion(AVFilterContext *ctx, AVFrame *ref)
{
    VMAFMotionContext *s = ctx->priv;
    double score;

    score = ff_vmafmotion_process(&s->data, ref);
    set_meta(&ref->metadata, "lavfi.vmafmotion.score", score);
    if (s->stats_file) {
        fprintf(s->stats_file,
                "n:%"PRId64" motion:%0.2lf\n", s->data.nb_frames, score);
    }
}


int ff_vmafmotion_init(VMAFMotionData *s,
                       int w, int h, enum AVPixelFormat fmt)
{
    size_t data_sz;
    int i;
    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);

    if (w < 3 || h < 3)
        return AVERROR(EINVAL);

    s->width = w;
    s->height = h;
    s->stride = FFALIGN(w * sizeof(uint16_t), 32);

    data_sz = (size_t) s->stride * h;
    if (!(s->blur_data[0] = av_malloc(data_sz)) ||
        !(s->blur_data[1] = av_malloc(data_sz)) ||
        !(s->temp_data    = av_malloc(data_sz))) {
        return AVERROR(ENOMEM);
    }

    for (i = 0; i < 5; i++) {
        s->filter[i] = lrint(FILTER_5[i] * (1 << BIT_SHIFT));
    }

    vmafmotiondsp_init(&s->vmafdsp, desc->comp[0].depth);

    return 0;
}

static int query_formats(AVFilterContext *ctx)
{
    AVFilterFormats *fmts_list = NULL;
    int format, ret;

    for (format = 0; av_pix_fmt_desc_get(format); format++) {
        const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(format);
        if (!(desc->flags & (AV_PIX_FMT_FLAG_RGB | AV_PIX_FMT_FLAG_HWACCEL | AV_PIX_FMT_FLAG_BITSTREAM | AV_PIX_FMT_FLAG_PAL)) &&
            (desc->flags & AV_PIX_FMT_FLAG_PLANAR || desc->nb_components == 1) &&
            (!(desc->flags & AV_PIX_FMT_FLAG_BE) == !HAVE_BIGENDIAN || desc->comp[0].depth == 8) &&
            (desc->comp[0].depth == 8 || desc->comp[0].depth == 10) &&
            (ret = ff_add_format(&fmts_list, format)) < 0)
            return ret;
    }

    return ff_set_common_formats(ctx, fmts_list);
}

static int config_input_ref(AVFilterLink *inlink)
{
    AVFilterContext *ctx  = inlink->dst;
    VMAFMotionContext *s = ctx->priv;

    return ff_vmafmotion_init(&s->data, ctx->inputs[0]->w,
                              ctx->inputs[0]->h, ctx->inputs[0]->format);
}

double ff_vmafmotion_uninit(VMAFMotionData *s)
{
    av_free(s->blur_data[0]);
    av_free(s->blur_data[1]);
    av_free(s->temp_data);

    return s->nb_frames > 0 ? s->motion_sum / s->nb_frames : 0.0;
}

static int filter_frame(AVFilterLink *inlink, AVFrame *ref)
{
    AVFilterContext *ctx = inlink->dst;
    do_vmafmotion(ctx, ref);
    return ff_filter_frame(ctx->outputs[0], ref);
}

static av_cold int init(AVFilterContext *ctx)
{
    VMAFMotionContext *s = ctx->priv;

    if (s->stats_file_str) {
        if (!strcmp(s->stats_file_str, "-")) {
            s->stats_file = stdout;
        } else {
            s->stats_file = avpriv_fopen_utf8(s->stats_file_str, "w");
            if (!s->stats_file) {
                int err = AVERROR(errno);
                av_log(ctx, AV_LOG_ERROR, "Could not open stats file %s: %s\n",
                       s->stats_file_str, av_err2str(err));
                return err;
            }
        }
    }

    return 0;
}

static av_cold void uninit(AVFilterContext *ctx)
{
    VMAFMotionContext *s = ctx->priv;
    double avg_motion = ff_vmafmotion_uninit(&s->data);

    if (s->data.nb_frames > 0) {
        av_log(ctx, AV_LOG_INFO, "VMAF Motion avg: %.3f\n", avg_motion);
    }

    if (s->stats_file && s->stats_file != stdout)
        fclose(s->stats_file);
}

static const AVFilterPad vmafmotion_inputs[] = {
    {
        .name         = "reference",
        .type         = AVMEDIA_TYPE_VIDEO,
        .filter_frame = filter_frame,
        .config_props = config_input_ref,
    },
};

const AVFilter ff_vf_vmafmotion = {
    .name          = "vmafmotion",
    .description   = NULL_IF_CONFIG_SMALL("Calculate the VMAF Motion score."),
    .init          = init,
    .uninit        = uninit,
    .priv_size     = sizeof(VMAFMotionContext),
    .priv_class    = &vmafmotion_class,
    .flags         = AVFILTER_FLAG_METADATA_ONLY,
    FILTER_INPUTS(vmafmotion_inputs),
    FILTER_OUTPUTS(ff_video_default_filterpad),
    FILTER_QUERY_FUNC(query_formats),
};