aboutsummaryrefslogtreecommitdiffstats
path: root/libavfilter/avf_showvolume.c
blob: 7ab2fcfc4cb23b5efbcda0456583a9945882c500 (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
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
/*
 * Copyright (c) 2015 Paul B Mahol
 *
 * 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
 */

#include "libavutil/avstring.h"
#include "libavutil/channel_layout.h"
#include "libavutil/eval.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
#include "libavutil/xga_font_data.h"
#include "avfilter.h"
#include "filters.h"
#include "formats.h"
#include "audio.h"
#include "video.h"
#include "internal.h"

static const char *const var_names[] = {   "VOLUME",   "CHANNEL",   "PEAK",        NULL };
enum                                   { VAR_VOLUME, VAR_CHANNEL, VAR_PEAK, VAR_VARS_NB };
enum DisplayScale   { LINEAR, LOG, NB_DISPLAY_SCALE };

typedef struct ShowVolumeContext {
    const AVClass *class;
    int w, h;
    int b;
    double f;
    AVRational frame_rate;
    char *color;
    int orientation;
    int step;
    float bgopacity;
    int mode;

    int nb_samples;
    AVFrame *out;
    AVExpr *c_expr;
    int draw_text;
    int draw_volume;
    double *values;
    uint32_t *color_lut;
    float *max;
    float rms_factor;
    int display_scale;

    double draw_persistent_duration; /* in second */
    uint8_t persistant_max_rgba[4];
    int persistent_max_frames; /* number of frames to check max value */
    float *max_persistent; /* max value for draw_persistent_max for each channel */
    int *nb_frames_max_display; /* number of frame for each channel, for displaying the max value */

    void (*meter)(float *src, int nb_samples, float *max, float factor);
} ShowVolumeContext;

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

static const AVOption showvolume_options[] = {
    { "rate", "set video rate",  OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, INT_MAX, FLAGS },
    { "r",    "set video rate",  OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, INT_MAX, FLAGS },
    { "b", "set border width",   OFFSET(b), AV_OPT_TYPE_INT, {.i64=1}, 0, 5, FLAGS },
    { "w", "set channel width",  OFFSET(w), AV_OPT_TYPE_INT, {.i64=400}, 80, 8192, FLAGS },
    { "h", "set channel height", OFFSET(h), AV_OPT_TYPE_INT, {.i64=20}, 1, 900, FLAGS },
    { "f", "set fade",           OFFSET(f), AV_OPT_TYPE_DOUBLE, {.dbl=0.95}, 0, 1, FLAGS },
    { "c", "set volume color expression", OFFSET(color), AV_OPT_TYPE_STRING, {.str="PEAK*255+floor((1-PEAK)*255)*256+0xff000000"}, 0, 0, FLAGS },
    { "t", "display channel names", OFFSET(draw_text), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS },
    { "v", "display volume value", OFFSET(draw_volume), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS },
    { "dm", "duration for max value display", OFFSET(draw_persistent_duration), AV_OPT_TYPE_DOUBLE, {.dbl=0.}, 0, 9000, FLAGS},
    { "dmc","set color of the max value line", OFFSET(persistant_max_rgba), AV_OPT_TYPE_COLOR, {.str = "orange"}, 0, 0, FLAGS },
    { "o", "set orientation", OFFSET(orientation), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "orientation" },
    {   "h", "horizontal", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "orientation" },
    {   "v", "vertical",   0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "orientation" },
    { "s", "set step size", OFFSET(step), AV_OPT_TYPE_INT, {.i64=0}, 0, 5, FLAGS },
    { "p", "set background opacity", OFFSET(bgopacity), AV_OPT_TYPE_FLOAT, {.dbl=0}, 0, 1, FLAGS },
    { "m", "set mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "mode" },
    {   "p", "peak", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "mode" },
    {   "r", "rms",  0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "mode" },
    { "ds", "set display scale", OFFSET(display_scale), AV_OPT_TYPE_INT, {.i64=LINEAR}, LINEAR, NB_DISPLAY_SCALE - 1, FLAGS, "display_scale" },
    {   "lin", "linear", 0, AV_OPT_TYPE_CONST, {.i64=LINEAR}, 0, 0, FLAGS, "display_scale" },
    {   "log", "log",  0, AV_OPT_TYPE_CONST, {.i64=LOG}, 0, 0, FLAGS, "display_scale" },
    { NULL }
};

AVFILTER_DEFINE_CLASS(showvolume);

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

    if (s->color) {
        ret = av_expr_parse(&s->c_expr, s->color, var_names,
                            NULL, NULL, NULL, NULL, 0, ctx);
        if (ret < 0)
            return ret;
    }

    return 0;
}

static int query_formats(AVFilterContext *ctx)
{
    AVFilterFormats *formats = NULL;
    AVFilterChannelLayouts *layouts = NULL;
    AVFilterLink *inlink = ctx->inputs[0];
    AVFilterLink *outlink = ctx->outputs[0];
    static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_NONE };
    static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_RGBA, AV_PIX_FMT_NONE };
    int ret;

    formats = ff_make_format_list(sample_fmts);
    if ((ret = ff_formats_ref(formats, &inlink->out_formats)) < 0)
        return ret;

    layouts = ff_all_channel_counts();
    if ((ret = ff_channel_layouts_ref(layouts, &inlink->out_channel_layouts)) < 0)
        return ret;

    formats = ff_all_samplerates();
    if ((ret = ff_formats_ref(formats, &inlink->out_samplerates)) < 0)
        return ret;

    formats = ff_make_format_list(pix_fmts);
    if ((ret = ff_formats_ref(formats, &outlink->in_formats)) < 0)
        return ret;

    return 0;
}

static void find_peak(float *src, int nb_samples, float *peak, float factor)
{
    int i;

    *peak = 0;
    for (i = 0; i < nb_samples; i++)
        *peak = FFMAX(*peak, FFABS(src[i]));
}

static void find_rms(float *src, int nb_samples, float *rms, float factor)
{
    int i;

    for (i = 0; i < nb_samples; i++)
        *rms += factor * (src[i] * src[i] - *rms);
}

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

    s->nb_samples = FFMAX(1, av_rescale(inlink->sample_rate, s->frame_rate.den, s->frame_rate.num));
    s->values = av_calloc(inlink->channels * VAR_VARS_NB, sizeof(double));
    if (!s->values)
        return AVERROR(ENOMEM);

    s->color_lut = av_calloc(s->w, sizeof(*s->color_lut) * inlink->channels);
    if (!s->color_lut)
        return AVERROR(ENOMEM);

    s->max = av_calloc(inlink->channels, sizeof(*s->max));
    if (!s->max)
        return AVERROR(ENOMEM);

    s->rms_factor = 10000. / inlink->sample_rate;

    switch (s->mode) {
    case 0: s->meter = find_peak; break;
    case 1: s->meter = find_rms;  break;
    default: return AVERROR_BUG;
    }

    if (s->draw_persistent_duration > 0.) {
        s->persistent_max_frames = (int) FFMAX(av_q2d(s->frame_rate) * s->draw_persistent_duration, 1.);
        s->max_persistent = av_calloc(inlink->channels * s->persistent_max_frames, sizeof(*s->max_persistent));
        s->nb_frames_max_display = av_calloc(inlink->channels * s->persistent_max_frames, sizeof(*s->nb_frames_max_display));
    }
    return 0;
}

static int config_output(AVFilterLink *outlink)
{
    ShowVolumeContext *s = outlink->src->priv;
    AVFilterLink *inlink = outlink->src->inputs[0];
    int ch;

    if (s->orientation) {
        outlink->h = s->w;
        outlink->w = s->h * inlink->channels + (inlink->channels - 1) * s->b;
    } else {
        outlink->w = s->w;
        outlink->h = s->h * inlink->channels + (inlink->channels - 1) * s->b;
    }

    outlink->sample_aspect_ratio = (AVRational){1,1};
    outlink->frame_rate = s->frame_rate;

    for (ch = 0; ch < inlink->channels; ch++) {
        int i;

        for (i = 0; i < s->w; i++) {
            float max = i / (float)(s->w - 1);

            s->values[ch * VAR_VARS_NB + VAR_PEAK] = max;
            s->values[ch * VAR_VARS_NB + VAR_VOLUME] = 20.0 * log10(max);
            s->values[ch * VAR_VARS_NB + VAR_CHANNEL] = ch;
            s->color_lut[ch * s->w + i] = av_expr_eval(s->c_expr, &s->values[ch * VAR_VARS_NB], NULL);
        }
    }

    return 0;
}

static void drawtext(AVFrame *pic, int x, int y, const char *txt, int o)
{
    const uint8_t *font;
    int font_height;
    int i;

    font = avpriv_cga_font,   font_height =  8;

    for (i = 0; txt[i]; i++) {
        int char_y, mask;

        if (o) { /* vertical orientation */
            for (char_y = font_height - 1; char_y >= 0; char_y--) {
                uint8_t *p = pic->data[0] + (y + i * 10) * pic->linesize[0] + x * 4;
                for (mask = 0x80; mask; mask >>= 1) {
                    if (font[txt[i] * font_height + font_height - 1 - char_y] & mask)
                        AV_WN32(&p[char_y * 4], ~AV_RN32(&p[char_y * 4]));
                    p += pic->linesize[0];
                }
            }
        } else { /* horizontal orientation */
            uint8_t *p = pic->data[0] + y * pic->linesize[0] + (x + i * 8) * 4;
            for (char_y = 0; char_y < font_height; char_y++) {
                for (mask = 0x80; mask; mask >>= 1) {
                    if (font[txt[i] * font_height + char_y] & mask)
                        AV_WN32(p, ~AV_RN32(p));
                    p += 4;
                }
                p += pic->linesize[0] - 8 * 4;
            }
        }
    }
}

static void clear_picture(ShowVolumeContext *s, AVFilterLink *outlink)
{
    int i, j;
    const uint32_t bg = (uint32_t)(s->bgopacity * 255) << 24;

    for (i = 0; i < outlink->h; i++) {
        uint32_t *dst = (uint32_t *)(s->out->data[0] + i * s->out->linesize[0]);
        for (j = 0; j < outlink->w; j++)
            AV_WN32A(dst + j, bg);
    }
}

static inline int calc_max_draw(ShowVolumeContext *s, AVFilterLink *outlink, float max)
{
    float max_val;
    if (s->display_scale == LINEAR) {
        max_val = max;
    } else { /* log */
        max_val = av_clipf(0.21 * log10(max) + 1, 0, 1);
    }
    if (s->orientation) { /* vertical */
        return outlink->h - outlink->h * max_val;
    } else { /* horizontal */
        return s->w * max_val;
    }
}

static inline void calc_persistent_max(ShowVolumeContext *s, float max, int channel)
{
    /* update max value for persistent max display */
    if ((max >= s->max_persistent[channel]) || (s->nb_frames_max_display[channel] >= s->persistent_max_frames)) { /* update max value for display */
        s->max_persistent[channel] = max;
        s->nb_frames_max_display[channel] = 0;
    } else {
        s->nb_frames_max_display[channel] += 1; /* incremente display frame count */
    }
}

static inline void draw_max_line(ShowVolumeContext *s, int max_draw, int channel)
{
    int k;
    if (s->orientation) { /* vertical */
        uint8_t *dst = s->out->data[0] + max_draw * s->out->linesize[0] + channel * (s->b + s->h) * 4;
        for (k = 0; k < s->h; k++) {
            memcpy(dst + k * 4, s->persistant_max_rgba, sizeof(s->persistant_max_rgba));
        }
    } else { /* horizontal */
        for (k = 0; k < s->h; k++) {
            uint8_t *dst = s->out->data[0] + (channel * s->h + channel * s->b + k) * s->out->linesize[0];
            memcpy(dst + max_draw * 4, s->persistant_max_rgba, sizeof(s->persistant_max_rgba));
        }
    }
}

static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
{
    AVFilterContext *ctx = inlink->dst;
    AVFilterLink *outlink = ctx->outputs[0];
    ShowVolumeContext *s = ctx->priv;
    const int step = s->step;
    int c, j, k, max_draw;
    AVFrame *out;

    if (!s->out || s->out->width  != outlink->w ||
                   s->out->height != outlink->h) {
        av_frame_free(&s->out);
        s->out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
        if (!s->out) {
            av_frame_free(&insamples);
            return AVERROR(ENOMEM);
        }
        clear_picture(s, outlink);
    }
    s->out->pts = insamples->pts;

    if ((s->f < 1.) && (s->f > 0.)) {
        for (j = 0; j < outlink->h; j++) {
            uint8_t *dst = s->out->data[0] + j * s->out->linesize[0];
            const uint32_t alpha = s->bgopacity * 255;

            for (k = 0; k < outlink->w; k++) {
                dst[k * 4 + 0] = FFMAX(dst[k * 4 + 0] * s->f, 0);
                dst[k * 4 + 1] = FFMAX(dst[k * 4 + 1] * s->f, 0);
                dst[k * 4 + 2] = FFMAX(dst[k * 4 + 2] * s->f, 0);
                dst[k * 4 + 3] = FFMAX(dst[k * 4 + 3] * s->f, alpha);
            }
        }
    } else if (s->f == 0.) {
        clear_picture(s, outlink);
    }

    if (s->orientation) { /* vertical */
        for (c = 0; c < inlink->channels; c++) {
            float *src = (float *)insamples->extended_data[c];
            uint32_t *lut = s->color_lut + s->w * c;
            float max;

            s->meter(src, insamples->nb_samples, &s->max[c], s->rms_factor);
            max = s->max[c];

            s->values[c * VAR_VARS_NB + VAR_VOLUME] = 20.0 * log10(max);
            max = av_clipf(max, 0, 1);
            max_draw = calc_max_draw(s, outlink, max);

            for (j = max_draw; j < s->w; j++) {
                uint8_t *dst = s->out->data[0] + j * s->out->linesize[0] + c * (s->b + s->h) * 4;
                for (k = 0; k < s->h; k++) {
                    AV_WN32A(&dst[k * 4], lut[s->w - j - 1]);
                    if (j & step)
                        j += step;
                }
            }

            if (s->h >= 8 && s->draw_text) {
                const char *channel_name = av_get_channel_name(av_channel_layout_extract_channel(insamples->channel_layout, c));
                if (!channel_name)
                    continue;
                drawtext(s->out, c * (s->h + s->b) + (s->h - 10) / 2, outlink->h - 35, channel_name, 1);
            }

            if (s->draw_persistent_duration > 0.) {
                calc_persistent_max(s, max, c);
                max_draw = FFMAX(0, calc_max_draw(s, outlink, s->max_persistent[c]) - 1);
                draw_max_line(s, max_draw, c);
            }
        }
    } else { /* horizontal */
        for (c = 0; c < inlink->channels; c++) {
            float *src = (float *)insamples->extended_data[c];
            uint32_t *lut = s->color_lut + s->w * c;
            float max;

            s->meter(src, insamples->nb_samples, &s->max[c], s->rms_factor);
            max = s->max[c];

            s->values[c * VAR_VARS_NB + VAR_VOLUME] = 20.0 * log10(max);
            max = av_clipf(max, 0, 1);
            max_draw = calc_max_draw(s, outlink, max);

            for (j = 0; j < s->h; j++) {
                uint8_t *dst = s->out->data[0] + (c * s->h + c * s->b + j) * s->out->linesize[0];

                for (k = 0; k < max_draw; k++) {
                    AV_WN32A(dst + k * 4, lut[k]);
                    if (k & step)
                        k += step;
                }
            }

            if (s->h >= 8 && s->draw_text) {
                const char *channel_name = av_get_channel_name(av_channel_layout_extract_channel(insamples->channel_layout, c));
                if (!channel_name)
                    continue;
                drawtext(s->out, 2, c * (s->h + s->b) + (s->h - 8) / 2, channel_name, 0);
            }

            if (s->draw_persistent_duration > 0.) {
                calc_persistent_max(s, max, c);
                max_draw = FFMAX(0, calc_max_draw(s, outlink, s->max_persistent[c]) - 1);
                draw_max_line(s, max_draw, c);
            }
        }
    }

    av_frame_free(&insamples);
    out = av_frame_clone(s->out);
    if (!out)
        return AVERROR(ENOMEM);
    av_frame_make_writable(out);

    /* draw volume level */
    for (c = 0; c < inlink->channels && s->h >= 8 && s->draw_volume; c++) {
        char buf[16];

        if (s->orientation) { /* vertical */
            snprintf(buf, sizeof(buf), "%.2f", s->values[c * VAR_VARS_NB + VAR_VOLUME]);
            drawtext(out, c * (s->h + s->b) + (s->h - 8) / 2, 2, buf, 1);
        } else { /* horizontal */
            snprintf(buf, sizeof(buf), "%.2f", s->values[c * VAR_VARS_NB + VAR_VOLUME]);
            drawtext(out, FFMAX(0, s->w - 8 * (int)strlen(buf)), c * (s->h + s->b) + (s->h - 8) / 2, buf, 0);
        }
    }

    return ff_filter_frame(outlink, out);
}

static int activate(AVFilterContext *ctx)
{
    AVFilterLink *inlink = ctx->inputs[0];
    AVFilterLink *outlink = ctx->outputs[0];
    ShowVolumeContext *s = ctx->priv;
    AVFrame *in = NULL;
    int ret;

    FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);

    ret = ff_inlink_consume_samples(inlink, s->nb_samples, s->nb_samples, &in);
    if (ret < 0)
        return ret;
    if (ret > 0)
        return filter_frame(inlink, in);

    FF_FILTER_FORWARD_STATUS(inlink, outlink);
    FF_FILTER_FORWARD_WANTED(outlink, inlink);

    return FFERROR_NOT_READY;
}

static av_cold void uninit(AVFilterContext *ctx)
{
    ShowVolumeContext *s = ctx->priv;

    av_frame_free(&s->out);
    av_expr_free(s->c_expr);
    av_freep(&s->values);
    av_freep(&s->color_lut);
    av_freep(&s->max);
}

static const AVFilterPad showvolume_inputs[] = {
    {
        .name         = "default",
        .type         = AVMEDIA_TYPE_AUDIO,
        .config_props = config_input,
    },
    { NULL }
};

static const AVFilterPad showvolume_outputs[] = {
    {
        .name         = "default",
        .type         = AVMEDIA_TYPE_VIDEO,
        .config_props = config_output,
    },
    { NULL }
};

AVFilter ff_avf_showvolume = {
    .name          = "showvolume",
    .description   = NULL_IF_CONFIG_SMALL("Convert input audio volume to video output."),
    .init          = init,
    .activate      = activate,
    .uninit        = uninit,
    .query_formats = query_formats,
    .priv_size     = sizeof(ShowVolumeContext),
    .inputs        = showvolume_inputs,
    .outputs       = showvolume_outputs,
    .priv_class    = &showvolume_class,
};