2 * Copyright (c) 2014 Muhammad Faiz <mfcc64@gmail.com>
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavcodec/avfft.h"
23 #include "libavutil/avassert.h"
24 #include "libavutil/channel_layout.h"
25 #include "libavutil/opt.h"
26 #include "libavutil/xga_font_data.h"
27 #include "libavutil/qsort.h"
28 #include "libavutil/time.h"
29 #include "libavutil/eval.h"
36 #if CONFIG_LIBFREETYPE
38 #include FT_FREETYPE_H
41 /* this filter is designed to do 16 bins/semitones constant Q transform with Brown-Puckette algorithm
42 * start from E0 to D#10 (10 octaves)
43 * so there are 16 bins/semitones * 12 semitones/octaves * 10 octaves = 1920 bins
44 * match with full HD resolution */
46 #define VIDEO_WIDTH 1920
47 #define VIDEO_HEIGHT 1080
48 #define FONT_HEIGHT 32
49 #define SPECTOGRAM_HEIGHT ((VIDEO_HEIGHT-FONT_HEIGHT)/2)
50 #define SPECTOGRAM_START (VIDEO_HEIGHT-SPECTOGRAM_HEIGHT)
51 #define BASE_FREQ 20.051392800492
52 #define COEFF_CLAMP 1.0e-4
53 #define TLENGTH_MIN 0.001
54 #define TLENGTH_DEFAULT "384/f*tc/(384/f+tc)"
55 #define VOLUME_MIN 1e-10
56 #define VOLUME_MAX 100.0
57 #define FONTCOLOR_DEFAULT "st(0, (midi(f)-59.5)/12);" \
58 "st(1, if(between(ld(0),0,1), 0.5-0.5*cos(2*PI*ld(0)), 0));" \
59 "r(1-ld(1)) + b(ld(1))"
69 FFTContext *fft_context;
71 FFTComplex *fft_result_left;
72 FFTComplex *fft_result_right;
74 SparseCoeff *coeff_sort;
75 SparseCoeff *coeffs[VIDEO_WIDTH];
77 char *fontfile; /* using freetype */
78 int coeffs_len[VIDEO_WIDTH];
79 uint8_t fontcolor_value[VIDEO_WIDTH*3]; /* result of fontcolor option */
89 double timeclamp; /* lower timeclamp, time-accurate, higher timeclamp, freq-accurate (at low freq)*/
90 float coeffclamp; /* lower coeffclamp, more precise, higher coeffclamp, faster */
91 int fullhd; /* if true, output video is at full HD resolution, otherwise it will be halved */
92 float gamma; /* lower gamma, more contrast, higher gamma, more range */
93 float gamma2; /* gamma of bargraph */
94 int fps; /* the required fps is so strict, so it's enough to be int, but 24000/1001 etc cannot be encoded */
95 int count; /* fps * count = transform rate */
98 #define OFFSET(x) offsetof(ShowCQTContext, x)
99 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
101 static const AVOption showcqt_options[] = {
102 { "volume", "set volume", OFFSET(volume), AV_OPT_TYPE_STRING, { .str = "16" }, CHAR_MIN, CHAR_MAX, FLAGS },
103 { "tlength", "set transform length", OFFSET(tlength), AV_OPT_TYPE_STRING, { .str = TLENGTH_DEFAULT }, CHAR_MIN, CHAR_MAX, FLAGS },
104 { "timeclamp", "set timeclamp", OFFSET(timeclamp), AV_OPT_TYPE_DOUBLE, { .dbl = 0.17 }, 0.1, 1.0, FLAGS },
105 { "coeffclamp", "set coeffclamp", OFFSET(coeffclamp), AV_OPT_TYPE_FLOAT, { .dbl = 1 }, 0.1, 10, FLAGS },
106 { "gamma", "set gamma", OFFSET(gamma), AV_OPT_TYPE_FLOAT, { .dbl = 3 }, 1, 7, FLAGS },
107 { "gamma2", "set gamma of bargraph", OFFSET(gamma2), AV_OPT_TYPE_FLOAT, { .dbl = 1 }, 1, 7, FLAGS },
108 { "fullhd", "set full HD resolution", OFFSET(fullhd), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, FLAGS },
109 { "fps", "set video fps", OFFSET(fps), AV_OPT_TYPE_INT, { .i64 = 25 }, 10, 100, FLAGS },
110 { "count", "set number of transform per frame", OFFSET(count), AV_OPT_TYPE_INT, { .i64 = 6 }, 1, 30, FLAGS },
111 { "fontfile", "set font file", OFFSET(fontfile), AV_OPT_TYPE_STRING, { .str = NULL }, CHAR_MIN, CHAR_MAX, FLAGS },
112 { "fontcolor", "set font color", OFFSET(fontcolor), AV_OPT_TYPE_STRING, { .str = FONTCOLOR_DEFAULT }, CHAR_MIN, CHAR_MAX, FLAGS },
116 AVFILTER_DEFINE_CLASS(showcqt);
118 static av_cold void uninit(AVFilterContext *ctx)
122 ShowCQTContext *s = ctx->priv;
123 av_fft_end(s->fft_context);
124 s->fft_context = NULL;
125 for (k = 0; k < VIDEO_WIDTH; k++)
126 av_freep(&s->coeffs[k]);
127 av_freep(&s->fft_data);
128 av_freep(&s->fft_result_left);
129 av_freep(&s->fft_result_right);
130 av_freep(&s->coeff_sort);
131 av_freep(&s->spectogram);
132 av_freep(&s->font_alpha);
133 av_frame_free(&s->outpicref);
136 static int query_formats(AVFilterContext *ctx)
138 AVFilterFormats *formats = NULL;
139 AVFilterChannelLayouts *layouts = NULL;
140 AVFilterLink *inlink = ctx->inputs[0];
141 AVFilterLink *outlink = ctx->outputs[0];
142 static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_NONE };
143 static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_RGB24, AV_PIX_FMT_NONE };
144 static const int64_t channel_layouts[] = { AV_CH_LAYOUT_STEREO, AV_CH_LAYOUT_STEREO_DOWNMIX, -1 };
145 static const int samplerates[] = { 44100, 48000, -1 };
147 /* set input audio formats */
148 formats = ff_make_format_list(sample_fmts);
150 return AVERROR(ENOMEM);
151 ff_formats_ref(formats, &inlink->out_formats);
153 layouts = avfilter_make_format64_list(channel_layouts);
155 return AVERROR(ENOMEM);
156 ff_channel_layouts_ref(layouts, &inlink->out_channel_layouts);
158 formats = ff_make_format_list(samplerates);
160 return AVERROR(ENOMEM);
161 ff_formats_ref(formats, &inlink->out_samplerates);
163 /* set output video format */
164 formats = ff_make_format_list(pix_fmts);
166 return AVERROR(ENOMEM);
167 ff_formats_ref(formats, &outlink->in_formats);
172 #if CONFIG_LIBFREETYPE
173 static void load_freetype_font(AVFilterContext *ctx)
175 static const char str[] = "EF G A BC D ";
176 ShowCQTContext *s = ctx->priv;
177 FT_Library lib = NULL;
179 int video_scale = s->fullhd ? 2 : 1;
180 int video_width = (VIDEO_WIDTH/2) * video_scale;
181 int font_height = (FONT_HEIGHT/2) * video_scale;
182 int font_width = 8 * video_scale;
183 int font_repeat = font_width * 12;
184 int linear_hori_advance = font_width * 65536;
185 int non_monospace_warning = 0;
188 s->font_alpha = NULL;
193 if (FT_Init_FreeType(&lib))
196 if (FT_New_Face(lib, s->fontfile, 0, &face))
199 if (FT_Set_Char_Size(face, 16*64, 0, 0, 0))
202 if (FT_Load_Char(face, 'A', FT_LOAD_RENDER))
205 if (FT_Set_Char_Size(face, 16*64 * linear_hori_advance / face->glyph->linearHoriAdvance, 0, 0, 0))
208 s->font_alpha = av_malloc_array(font_height, video_width);
212 memset(s->font_alpha, 0, font_height * video_width);
214 for (x = 0; x < 12; x++) {
215 int sx, sy, rx, bx, by, dx, dy;
220 if (FT_Load_Char(face, str[x], FT_LOAD_RENDER))
223 if (face->glyph->advance.x != font_width*64 && !non_monospace_warning) {
224 av_log(ctx, AV_LOG_WARNING, "Font is not monospace\n");
225 non_monospace_warning = 1;
228 sy = font_height - 4*video_scale - face->glyph->bitmap_top;
229 for (rx = 0; rx < 10; rx++) {
230 sx = rx * font_repeat + x * font_width + face->glyph->bitmap_left;
231 for (by = 0; by < face->glyph->bitmap.rows; by++) {
235 if (dy >= font_height)
238 for (bx = 0; bx < face->glyph->bitmap.width; bx++) {
242 if (dx >= video_width)
244 s->font_alpha[dy*video_width+dx] = face->glyph->bitmap.buffer[by*face->glyph->bitmap.width+bx];
251 FT_Done_FreeType(lib);
255 av_log(ctx, AV_LOG_WARNING, "Error while loading freetype font, using default font instead\n");
257 FT_Done_FreeType(lib);
258 av_freep(&s->font_alpha);
263 static double a_weighting(void *p, double f)
265 double ret = 12200.0*12200.0 * (f*f*f*f);
266 ret /= (f*f + 20.6*20.6) * (f*f + 12200.0*12200.0) *
267 sqrt((f*f + 107.7*107.7) * (f*f + 737.9*737.9));
271 static double b_weighting(void *p, double f)
273 double ret = 12200.0*12200.0 * (f*f*f);
274 ret /= (f*f + 20.6*20.6) * (f*f + 12200.0*12200.0) * sqrt(f*f + 158.5*158.5);
278 static double c_weighting(void *p, double f)
280 double ret = 12200.0*12200.0 * (f*f);
281 ret /= (f*f + 20.6*20.6) * (f*f + 12200.0*12200.0);
285 static double midi(void *p, double f)
287 return log2(f/440.0) * 12.0 + 69.0;
290 static double r_func(void *p, double x)
292 x = av_clipd(x, 0.0, 1.0);
293 return (int)(x*255.0+0.5) << 16;
296 static double g_func(void *p, double x)
298 x = av_clipd(x, 0.0, 1.0);
299 return (int)(x*255.0+0.5) << 8;
302 static double b_func(void *p, double x)
304 x = av_clipd(x, 0.0, 1.0);
305 return (int)(x*255.0+0.5);
308 static inline int qsort_sparsecoeff(const SparseCoeff *a, const SparseCoeff *b)
310 if (fabsf(a->value) >= fabsf(b->value))
316 static int config_output(AVFilterLink *outlink)
318 AVFilterContext *ctx = outlink->src;
319 AVFilterLink *inlink = ctx->inputs[0];
320 ShowCQTContext *s = ctx->priv;
321 AVExpr *tlength_expr = NULL, *volume_expr = NULL, *fontcolor_expr = NULL;
322 uint8_t *fontcolor_value = s->fontcolor_value;
323 static const char * const expr_vars[] = { "timeclamp", "tc", "frequency", "freq", "f", NULL };
324 static const char * const expr_func_names[] = { "a_weighting", "b_weighting", "c_weighting", NULL };
325 static const char * const expr_fontcolor_func_names[] = { "midi", "r", "g", "b", NULL };
326 static double (* const expr_funcs[])(void *, double) = { a_weighting, b_weighting, c_weighting, NULL };
327 static double (* const expr_fontcolor_funcs[])(void *, double) = { midi, r_func, g_func, b_func, NULL };
328 int fft_len, k, x, y, ret;
330 int rate = inlink->sample_rate;
331 double max_len = rate * (double) s->timeclamp;
332 int64_t start_time, end_time;
333 int video_scale = s->fullhd ? 2 : 1;
334 int video_width = (VIDEO_WIDTH/2) * video_scale;
335 int video_height = (VIDEO_HEIGHT/2) * video_scale;
336 int spectogram_height = (SPECTOGRAM_HEIGHT/2) * video_scale;
338 s->fft_bits = ceil(log2(max_len));
339 fft_len = 1 << s->fft_bits;
341 if (rate % (s->fps * s->count)) {
342 av_log(ctx, AV_LOG_ERROR, "Rate (%u) is not divisible by fps*count (%u*%u)\n", rate, s->fps, s->count);
343 return AVERROR(EINVAL);
346 s->fft_data = av_malloc_array(fft_len, sizeof(*s->fft_data));
347 s->coeff_sort = av_malloc_array(fft_len, sizeof(*s->coeff_sort));
348 s->fft_result_left = av_malloc_array(fft_len, sizeof(*s->fft_result_left));
349 s->fft_result_right = av_malloc_array(fft_len, sizeof(*s->fft_result_right));
350 s->fft_context = av_fft_init(s->fft_bits, 0);
352 if (!s->fft_data || !s->coeff_sort || !s->fft_result_left || !s->fft_result_right || !s->fft_context)
353 return AVERROR(ENOMEM);
355 #if CONFIG_LIBFREETYPE
356 load_freetype_font(ctx);
359 av_log(ctx, AV_LOG_WARNING, "Freetype is not available, ignoring fontfile option\n");
360 s->font_alpha = NULL;
363 av_log(ctx, AV_LOG_INFO, "Calculating spectral kernel, please wait\n");
364 start_time = av_gettime_relative();
365 ret = av_expr_parse(&tlength_expr, s->tlength, expr_vars, NULL, NULL, NULL, NULL, 0, ctx);
369 ret = av_expr_parse(&volume_expr, s->volume, expr_vars, expr_func_names,
370 expr_funcs, NULL, NULL, 0, ctx);
374 ret = av_expr_parse(&fontcolor_expr, s->fontcolor, expr_vars, expr_fontcolor_func_names,
375 expr_fontcolor_funcs, NULL, NULL, 0, ctx);
379 for (k = 0; k < VIDEO_WIDTH; k++) {
380 int hlen = fft_len >> 1;
383 double freq = BASE_FREQ * exp2(k * (1.0/192.0));
384 double tlen, tlength, volume;
385 double expr_vars_val[] = { s->timeclamp, s->timeclamp, freq, freq, freq, 0 };
386 /* a window function from Albert H. Nuttall,
387 * "Some Windows with Very Good Sidelobe Behavior"
388 * -93.32 dB peak sidelobe and 18 dB/octave asymptotic decay
389 * coefficient normalized to a0 = 1 */
390 double a0 = 0.355768;
391 double a1 = 0.487396/a0;
392 double a2 = 0.144232/a0;
393 double a3 = 0.012604/a0;
394 double sv_step, cv_step, sv, cv;
395 double sw_step, cw_step, sw, cw, w;
397 tlength = av_expr_eval(tlength_expr, expr_vars_val, NULL);
398 if (isnan(tlength)) {
399 av_log(ctx, AV_LOG_WARNING, "at freq %g: tlength is nan, setting it to %g\n", freq, s->timeclamp);
400 tlength = s->timeclamp;
401 } else if (tlength < TLENGTH_MIN) {
402 av_log(ctx, AV_LOG_WARNING, "at freq %g: tlength is %g, setting it to %g\n", freq, tlength, TLENGTH_MIN);
403 tlength = TLENGTH_MIN;
404 } else if (tlength > s->timeclamp) {
405 av_log(ctx, AV_LOG_WARNING, "at freq %g: tlength is %g, setting it to %g\n", freq, tlength, s->timeclamp);
406 tlength = s->timeclamp;
409 volume = FFABS(av_expr_eval(volume_expr, expr_vars_val, NULL));
411 av_log(ctx, AV_LOG_WARNING, "at freq %g: volume is nan, setting it to 0\n", freq);
413 } else if (volume < VOLUME_MIN) {
415 } else if (volume > VOLUME_MAX) {
416 av_log(ctx, AV_LOG_WARNING, "at freq %g: volume is %g, setting it to %g\n", freq, volume, VOLUME_MAX);
420 if (s->fullhd || !(k & 1)) {
421 int fontcolor = av_expr_eval(fontcolor_expr, expr_vars_val, NULL);
422 fontcolor_value[0] = (fontcolor >> 16) & 0xFF;
423 fontcolor_value[1] = (fontcolor >> 8) & 0xFF;
424 fontcolor_value[2] = fontcolor & 0xFF;
425 fontcolor_value += 3;
428 tlen = tlength * rate;
429 s->fft_data[0].re = 0;
430 s->fft_data[0].im = 0;
431 s->fft_data[hlen].re = (1.0 + a1 + a2 + a3) * (1.0/tlen) * volume * (1.0/fft_len);
432 s->fft_data[hlen].im = 0;
433 sv_step = sv = sin(2.0*M_PI*freq*(1.0/rate));
434 cv_step = cv = cos(2.0*M_PI*freq*(1.0/rate));
435 /* also optimizing window func */
436 sw_step = sw = sin(2.0*M_PI*(1.0/tlen));
437 cw_step = cw = cos(2.0*M_PI*(1.0/tlen));
438 for (x = 1; x < 0.5 * tlen; x++) {
439 double cv_tmp, cw_tmp;
440 double cw2, cw3, sw2;
442 cw2 = cw * cw - sw * sw;
443 sw2 = cw * sw + sw * cw;
444 cw3 = cw * cw2 - sw * sw2;
445 w = (1.0 + a1 * cw + a2 * cw2 + a3 * cw3) * (1.0/tlen) * volume * (1.0/fft_len);
446 s->fft_data[hlen + x].re = w * cv;
447 s->fft_data[hlen + x].im = w * sv;
448 s->fft_data[hlen - x].re = s->fft_data[hlen + x].re;
449 s->fft_data[hlen - x].im = -s->fft_data[hlen + x].im;
451 cv_tmp = cv * cv_step - sv * sv_step;
452 sv = sv * cv_step + cv * sv_step;
454 cw_tmp = cw * cw_step - sw * sw_step;
455 sw = sw * cw_step + cw * sw_step;
458 for (; x < hlen; x++) {
459 s->fft_data[hlen + x].re = 0;
460 s->fft_data[hlen + x].im = 0;
461 s->fft_data[hlen - x].re = 0;
462 s->fft_data[hlen - x].im = 0;
464 av_fft_permute(s->fft_context, s->fft_data);
465 av_fft_calc(s->fft_context, s->fft_data);
467 for (x = 0; x < fft_len; x++) {
468 s->coeff_sort[x].index = x;
469 s->coeff_sort[x].value = s->fft_data[x].re;
472 AV_QSORT(s->coeff_sort, fft_len, SparseCoeff, qsort_sparsecoeff);
473 for (x = 0; x < fft_len; x++)
474 total += fabsf(s->coeff_sort[x].value);
476 for (x = 0; x < fft_len; x++) {
477 partial += fabsf(s->coeff_sort[x].value);
478 if (partial > total * s->coeffclamp * COEFF_CLAMP) {
479 s->coeffs_len[k] = fft_len - x;
480 num_coeffs += s->coeffs_len[k];
481 s->coeffs[k] = av_malloc_array(s->coeffs_len[k], sizeof(*s->coeffs[k]));
483 ret = AVERROR(ENOMEM);
486 for (y = 0; y < s->coeffs_len[k]; y++)
487 s->coeffs[k][y] = s->coeff_sort[x+y];
492 av_expr_free(fontcolor_expr);
493 av_expr_free(volume_expr);
494 av_expr_free(tlength_expr);
495 end_time = av_gettime_relative();
496 av_log(ctx, AV_LOG_INFO, "Elapsed time %.6f s (fft_len=%u, num_coeffs=%u)\n", 1e-6 * (end_time-start_time), fft_len, num_coeffs);
498 outlink->w = video_width;
499 outlink->h = video_height;
501 s->req_fullfilled = 0;
502 s->spectogram_index = 0;
504 s->spectogram_count = 0;
505 s->remaining_fill = fft_len >> 1;
506 memset(s->fft_data, 0, fft_len * sizeof(*s->fft_data));
508 s->outpicref = ff_get_video_buffer(outlink, outlink->w, outlink->h);
510 return AVERROR(ENOMEM);
512 s->spectogram = av_calloc(spectogram_height, s->outpicref->linesize[0]);
514 return AVERROR(ENOMEM);
516 outlink->sample_aspect_ratio = av_make_q(1, 1);
517 outlink->time_base = av_make_q(1, s->fps);
518 outlink->frame_rate = av_make_q(s->fps, 1);
522 av_expr_free(fontcolor_expr);
523 av_expr_free(volume_expr);
524 av_expr_free(tlength_expr);
528 static int plot_cqt(AVFilterLink *inlink)
530 AVFilterContext *ctx = inlink->dst;
531 ShowCQTContext *s = ctx->priv;
532 AVFilterLink *outlink = ctx->outputs[0];
533 int fft_len = 1 << s->fft_bits;
534 FFTSample result[VIDEO_WIDTH][4];
536 int linesize = s->outpicref->linesize[0];
537 int video_scale = s->fullhd ? 2 : 1;
538 int video_width = (VIDEO_WIDTH/2) * video_scale;
539 int spectogram_height = (SPECTOGRAM_HEIGHT/2) * video_scale;
540 int spectogram_start = (SPECTOGRAM_START/2) * video_scale;
541 int font_height = (FONT_HEIGHT/2) * video_scale;
543 /* real part contains left samples, imaginary part contains right samples */
544 memcpy(s->fft_result_left, s->fft_data, fft_len * sizeof(*s->fft_data));
545 av_fft_permute(s->fft_context, s->fft_result_left);
546 av_fft_calc(s->fft_context, s->fft_result_left);
548 /* separate left and right, (and multiply by 2.0) */
549 s->fft_result_right[0].re = 2.0f * s->fft_result_left[0].im;
550 s->fft_result_right[0].im = 0;
551 s->fft_result_left[0].re = 2.0f * s->fft_result_left[0].re;
552 s->fft_result_left[0].im = 0;
553 for (x = 1; x <= fft_len >> 1; x++) {
554 FFTSample tmpy = s->fft_result_left[fft_len-x].im - s->fft_result_left[x].im;
556 s->fft_result_right[x].re = s->fft_result_left[x].im + s->fft_result_left[fft_len-x].im;
557 s->fft_result_right[x].im = s->fft_result_left[x].re - s->fft_result_left[fft_len-x].re;
558 s->fft_result_right[fft_len-x].re = s->fft_result_right[x].re;
559 s->fft_result_right[fft_len-x].im = -s->fft_result_right[x].im;
561 s->fft_result_left[x].re = s->fft_result_left[x].re + s->fft_result_left[fft_len-x].re;
562 s->fft_result_left[x].im = tmpy;
563 s->fft_result_left[fft_len-x].re = s->fft_result_left[x].re;
564 s->fft_result_left[fft_len-x].im = -s->fft_result_left[x].im;
567 /* calculating cqt */
568 for (x = 0; x < VIDEO_WIDTH; x++) {
570 FFTComplex l = {0,0};
571 FFTComplex r = {0,0};
573 for (u = 0; u < s->coeffs_len[x]; u++) {
574 FFTSample value = s->coeffs[x][u].value;
575 int index = s->coeffs[x][u].index;
576 l.re += value * s->fft_result_left[index].re;
577 l.im += value * s->fft_result_left[index].im;
578 r.re += value * s->fft_result_right[index].re;
579 r.im += value * s->fft_result_right[index].im;
581 /* result is power, not amplitude */
582 result[x][0] = l.re * l.re + l.im * l.im;
583 result[x][2] = r.re * r.re + r.im * r.im;
584 result[x][1] = 0.5f * (result[x][0] + result[x][2]);
586 if (s->gamma2 == 1.0f)
587 result[x][3] = result[x][1];
588 else if (s->gamma2 == 2.0f)
589 result[x][3] = sqrtf(result[x][1]);
590 else if (s->gamma2 == 3.0f)
591 result[x][3] = cbrtf(result[x][1]);
592 else if (s->gamma2 == 4.0f)
593 result[x][3] = sqrtf(sqrtf(result[x][1]));
595 result[x][3] = expf(logf(result[x][1]) * (1.0f / s->gamma2));
597 result[x][0] = FFMIN(1.0f, result[x][0]);
598 result[x][1] = FFMIN(1.0f, result[x][1]);
599 result[x][2] = FFMIN(1.0f, result[x][2]);
600 if (s->gamma == 1.0f) {
601 result[x][0] = 255.0f * result[x][0];
602 result[x][1] = 255.0f * result[x][1];
603 result[x][2] = 255.0f * result[x][2];
604 } else if (s->gamma == 2.0f) {
605 result[x][0] = 255.0f * sqrtf(result[x][0]);
606 result[x][1] = 255.0f * sqrtf(result[x][1]);
607 result[x][2] = 255.0f * sqrtf(result[x][2]);
608 } else if (s->gamma == 3.0f) {
609 result[x][0] = 255.0f * cbrtf(result[x][0]);
610 result[x][1] = 255.0f * cbrtf(result[x][1]);
611 result[x][2] = 255.0f * cbrtf(result[x][2]);
612 } else if (s->gamma == 4.0f) {
613 result[x][0] = 255.0f * sqrtf(sqrtf(result[x][0]));
614 result[x][1] = 255.0f * sqrtf(sqrtf(result[x][1]));
615 result[x][2] = 255.0f * sqrtf(sqrtf(result[x][2]));
617 result[x][0] = 255.0f * expf(logf(result[x][0]) * (1.0f / s->gamma));
618 result[x][1] = 255.0f * expf(logf(result[x][1]) * (1.0f / s->gamma));
619 result[x][2] = 255.0f * expf(logf(result[x][2]) * (1.0f / s->gamma));
624 for (x = 0; x < video_width; x++) {
625 result[x][0] = 0.5f * (result[2*x][0] + result[2*x+1][0]);
626 result[x][1] = 0.5f * (result[2*x][1] + result[2*x+1][1]);
627 result[x][2] = 0.5f * (result[2*x][2] + result[2*x+1][2]);
628 result[x][3] = 0.5f * (result[2*x][3] + result[2*x+1][3]);
632 for (x = 0; x < video_width; x++) {
633 s->spectogram[s->spectogram_index*linesize + 3*x] = result[x][0] + 0.5f;
634 s->spectogram[s->spectogram_index*linesize + 3*x + 1] = result[x][1] + 0.5f;
635 s->spectogram[s->spectogram_index*linesize + 3*x + 2] = result[x][2] + 0.5f;
639 if (!s->spectogram_count) {
640 uint8_t *data = (uint8_t*) s->outpicref->data[0];
641 float rcp_result[VIDEO_WIDTH];
642 int total_length = linesize * spectogram_height;
643 int back_length = linesize * s->spectogram_index;
645 for (x = 0; x < video_width; x++)
646 rcp_result[x] = 1.0f / (result[x][3]+0.0001f);
649 for (y = 0; y < spectogram_height; y++) {
650 float height = (spectogram_height - y) * (1.0f/spectogram_height);
651 uint8_t *lineptr = data + y * linesize;
652 for (x = 0; x < video_width; x++) {
654 if (result[x][3] <= height) {
659 mul = (result[x][3] - height) * rcp_result[x];
660 *lineptr++ = mul * result[x][0] + 0.5f;
661 *lineptr++ = mul * result[x][1] + 0.5f;
662 *lineptr++ = mul * result[x][2] + 0.5f;
669 for (y = 0; y < font_height; y++) {
670 uint8_t *lineptr = data + (spectogram_height + y) * linesize;
671 uint8_t *spectogram_src = s->spectogram + s->spectogram_index * linesize;
672 uint8_t *fontcolor_value = s->fontcolor_value;
673 for (x = 0; x < video_width; x++) {
674 uint8_t alpha = s->font_alpha[y*video_width+x];
675 lineptr[3*x] = (spectogram_src[3*x] * (255-alpha) + fontcolor_value[0] * alpha + 255) >> 8;
676 lineptr[3*x+1] = (spectogram_src[3*x+1] * (255-alpha) + fontcolor_value[1] * alpha + 255) >> 8;
677 lineptr[3*x+2] = (spectogram_src[3*x+2] * (255-alpha) + fontcolor_value[2] * alpha + 255) >> 8;
678 fontcolor_value += 3;
682 for (y = 0; y < font_height; y++) {
683 uint8_t *lineptr = data + (spectogram_height + y) * linesize;
684 memcpy(lineptr, s->spectogram + s->spectogram_index * linesize, video_width*3);
686 for (x = 0; x < video_width; x += video_width/10) {
688 static const char str[] = "EF G A BC D ";
689 uint8_t *startptr = data + spectogram_height * linesize + x * 3;
690 for (u = 0; str[u]; u++) {
692 for (v = 0; v < 16; v++) {
693 uint8_t *p = startptr + v * linesize * video_scale + 8 * 3 * u * video_scale;
694 int ux = x + 8 * u * video_scale;
696 for (mask = 0x80; mask; mask >>= 1) {
697 if (mask & avpriv_vga16_font[str[u] * 16 + v]) {
698 p[0] = s->fontcolor_value[3*ux];
699 p[1] = s->fontcolor_value[3*ux+1];
700 p[2] = s->fontcolor_value[3*ux+2];
701 if (video_scale == 2) {
703 p[linesize+1] = p[1];
704 p[linesize+2] = p[2];
705 p[3] = p[linesize+3] = s->fontcolor_value[3*ux+3];
706 p[4] = p[linesize+4] = s->fontcolor_value[3*ux+4];
707 p[5] = p[linesize+5] = s->fontcolor_value[3*ux+5];
710 p += 3 * video_scale;
718 /* drawing spectogram/sonogram */
719 data += spectogram_start * linesize;
720 memcpy(data, s->spectogram + s->spectogram_index*linesize, total_length - back_length);
722 data += total_length - back_length;
724 memcpy(data, s->spectogram, back_length);
726 s->outpicref->pts = s->frame_count;
727 ret = ff_filter_frame(outlink, av_frame_clone(s->outpicref));
728 s->req_fullfilled = 1;
731 s->spectogram_count = (s->spectogram_count + 1) % s->count;
732 s->spectogram_index = (s->spectogram_index + spectogram_height - 1) % spectogram_height;
736 static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
738 AVFilterContext *ctx = inlink->dst;
739 ShowCQTContext *s = ctx->priv;
740 int step = inlink->sample_rate / (s->fps * s->count);
741 int fft_len = 1 << s->fft_bits;
746 while (s->remaining_fill < (fft_len >> 1)) {
748 memset(&s->fft_data[fft_len - s->remaining_fill], 0, sizeof(*s->fft_data) * s->remaining_fill);
749 ret = plot_cqt(inlink);
752 for (x = 0; x < (fft_len-step); x++)
753 s->fft_data[x] = s->fft_data[x+step];
754 s->remaining_fill += step;
759 remaining = insamples->nb_samples;
760 audio_data = (float*) insamples->data[0];
763 if (remaining >= s->remaining_fill) {
764 int i = insamples->nb_samples - remaining;
765 int j = fft_len - s->remaining_fill;
767 for (m = 0; m < s->remaining_fill; m++) {
768 s->fft_data[j+m].re = audio_data[2*(i+m)];
769 s->fft_data[j+m].im = audio_data[2*(i+m)+1];
771 ret = plot_cqt(inlink);
773 av_frame_free(&insamples);
776 remaining -= s->remaining_fill;
777 for (m = 0; m < fft_len-step; m++)
778 s->fft_data[m] = s->fft_data[m+step];
779 s->remaining_fill = step;
781 int i = insamples->nb_samples - remaining;
782 int j = fft_len - s->remaining_fill;
784 for (m = 0; m < remaining; m++) {
785 s->fft_data[m+j].re = audio_data[2*(i+m)];
786 s->fft_data[m+j].im = audio_data[2*(i+m)+1];
788 s->remaining_fill -= remaining;
792 av_frame_free(&insamples);
796 static int request_frame(AVFilterLink *outlink)
798 ShowCQTContext *s = outlink->src->priv;
799 AVFilterLink *inlink = outlink->src->inputs[0];
802 s->req_fullfilled = 0;
804 ret = ff_request_frame(inlink);
805 } while (!s->req_fullfilled && ret >= 0);
807 if (ret == AVERROR_EOF && s->outpicref)
808 filter_frame(inlink, NULL);
812 static const AVFilterPad showcqt_inputs[] = {
815 .type = AVMEDIA_TYPE_AUDIO,
816 .filter_frame = filter_frame,
821 static const AVFilterPad showcqt_outputs[] = {
824 .type = AVMEDIA_TYPE_VIDEO,
825 .config_props = config_output,
826 .request_frame = request_frame,
831 AVFilter ff_avf_showcqt = {
833 .description = NULL_IF_CONFIG_SMALL("Convert input audio to a CQT (Constant Q Transform) spectrum video output."),
835 .query_formats = query_formats,
836 .priv_size = sizeof(ShowCQTContext),
837 .inputs = showcqt_inputs,
838 .outputs = showcqt_outputs,
839 .priv_class = &showcqt_class,