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;
73 SparseCoeff *coeff_sort;
74 SparseCoeff *coeffs[VIDEO_WIDTH];
76 char *fontfile; /* using freetype */
77 int coeffs_len[VIDEO_WIDTH];
78 uint8_t fontcolor_value[VIDEO_WIDTH*3]; /* result of fontcolor option */
88 double timeclamp; /* lower timeclamp, time-accurate, higher timeclamp, freq-accurate (at low freq)*/
89 float coeffclamp; /* lower coeffclamp, more precise, higher coeffclamp, faster */
90 int fullhd; /* if true, output video is at full HD resolution, otherwise it will be halved */
91 float gamma; /* lower gamma, more contrast, higher gamma, more range */
92 float gamma2; /* gamma of bargraph */
93 int fps; /* the required fps is so strict, so it's enough to be int, but 24000/1001 etc cannot be encoded */
94 int count; /* fps * count = transform rate */
97 #define OFFSET(x) offsetof(ShowCQTContext, x)
98 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
100 static const AVOption showcqt_options[] = {
101 { "volume", "set volume", OFFSET(volume), AV_OPT_TYPE_STRING, { .str = "16" }, CHAR_MIN, CHAR_MAX, FLAGS },
102 { "tlength", "set transform length", OFFSET(tlength), AV_OPT_TYPE_STRING, { .str = TLENGTH_DEFAULT }, CHAR_MIN, CHAR_MAX, FLAGS },
103 { "timeclamp", "set timeclamp", OFFSET(timeclamp), AV_OPT_TYPE_DOUBLE, { .dbl = 0.17 }, 0.1, 1.0, FLAGS },
104 { "coeffclamp", "set coeffclamp", OFFSET(coeffclamp), AV_OPT_TYPE_FLOAT, { .dbl = 1 }, 0.1, 10, FLAGS },
105 { "gamma", "set gamma", OFFSET(gamma), AV_OPT_TYPE_FLOAT, { .dbl = 3 }, 1, 7, FLAGS },
106 { "gamma2", "set gamma of bargraph", OFFSET(gamma2), AV_OPT_TYPE_FLOAT, { .dbl = 1 }, 1, 7, FLAGS },
107 { "fullhd", "set full HD resolution", OFFSET(fullhd), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, FLAGS },
108 { "fps", "set video fps", OFFSET(fps), AV_OPT_TYPE_INT, { .i64 = 25 }, 10, 100, FLAGS },
109 { "count", "set number of transform per frame", OFFSET(count), AV_OPT_TYPE_INT, { .i64 = 6 }, 1, 30, FLAGS },
110 { "fontfile", "set font file", OFFSET(fontfile), AV_OPT_TYPE_STRING, { .str = NULL }, CHAR_MIN, CHAR_MAX, FLAGS },
111 { "fontcolor", "set font color", OFFSET(fontcolor), AV_OPT_TYPE_STRING, { .str = FONTCOLOR_DEFAULT }, CHAR_MIN, CHAR_MAX, FLAGS },
115 AVFILTER_DEFINE_CLASS(showcqt);
117 static av_cold void uninit(AVFilterContext *ctx)
121 ShowCQTContext *s = ctx->priv;
122 av_fft_end(s->fft_context);
123 s->fft_context = NULL;
124 for (k = 0; k < VIDEO_WIDTH; k++)
125 av_freep(&s->coeffs[k]);
126 av_freep(&s->fft_data);
127 av_freep(&s->fft_result);
128 av_freep(&s->coeff_sort);
129 av_freep(&s->spectogram);
130 av_freep(&s->font_alpha);
131 av_frame_free(&s->outpicref);
134 static int query_formats(AVFilterContext *ctx)
136 AVFilterFormats *formats = NULL;
137 AVFilterChannelLayouts *layouts = NULL;
138 AVFilterLink *inlink = ctx->inputs[0];
139 AVFilterLink *outlink = ctx->outputs[0];
140 static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_NONE };
141 static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_RGB24, AV_PIX_FMT_NONE };
142 static const int64_t channel_layouts[] = { AV_CH_LAYOUT_STEREO, AV_CH_LAYOUT_STEREO_DOWNMIX, -1 };
143 static const int samplerates[] = { 44100, 48000, -1 };
145 /* set input audio formats */
146 formats = ff_make_format_list(sample_fmts);
148 return AVERROR(ENOMEM);
149 ff_formats_ref(formats, &inlink->out_formats);
151 layouts = avfilter_make_format64_list(channel_layouts);
153 return AVERROR(ENOMEM);
154 ff_channel_layouts_ref(layouts, &inlink->out_channel_layouts);
156 formats = ff_make_format_list(samplerates);
158 return AVERROR(ENOMEM);
159 ff_formats_ref(formats, &inlink->out_samplerates);
161 /* set output video format */
162 formats = ff_make_format_list(pix_fmts);
164 return AVERROR(ENOMEM);
165 ff_formats_ref(formats, &outlink->in_formats);
170 #if CONFIG_LIBFREETYPE
171 static void load_freetype_font(AVFilterContext *ctx)
173 static const char str[] = "EF G A BC D ";
174 ShowCQTContext *s = ctx->priv;
175 FT_Library lib = NULL;
177 int video_scale = s->fullhd ? 2 : 1;
178 int video_width = (VIDEO_WIDTH/2) * video_scale;
179 int font_height = (FONT_HEIGHT/2) * video_scale;
180 int font_width = 8 * video_scale;
181 int font_repeat = font_width * 12;
182 int linear_hori_advance = font_width * 65536;
183 int non_monospace_warning = 0;
186 s->font_alpha = NULL;
191 if (FT_Init_FreeType(&lib))
194 if (FT_New_Face(lib, s->fontfile, 0, &face))
197 if (FT_Set_Char_Size(face, 16*64, 0, 0, 0))
200 if (FT_Load_Char(face, 'A', FT_LOAD_RENDER))
203 if (FT_Set_Char_Size(face, 16*64 * linear_hori_advance / face->glyph->linearHoriAdvance, 0, 0, 0))
206 s->font_alpha = av_malloc_array(font_height, video_width);
210 memset(s->font_alpha, 0, font_height * video_width);
212 for (x = 0; x < 12; x++) {
213 int sx, sy, rx, bx, by, dx, dy;
218 if (FT_Load_Char(face, str[x], FT_LOAD_RENDER))
221 if (face->glyph->advance.x != font_width*64 && !non_monospace_warning) {
222 av_log(ctx, AV_LOG_WARNING, "Font is not monospace\n");
223 non_monospace_warning = 1;
226 sy = font_height - 4*video_scale - face->glyph->bitmap_top;
227 for (rx = 0; rx < 10; rx++) {
228 sx = rx * font_repeat + x * font_width + face->glyph->bitmap_left;
229 for (by = 0; by < face->glyph->bitmap.rows; by++) {
233 if (dy >= font_height)
236 for (bx = 0; bx < face->glyph->bitmap.width; bx++) {
240 if (dx >= video_width)
242 s->font_alpha[dy*video_width+dx] = face->glyph->bitmap.buffer[by*face->glyph->bitmap.width+bx];
249 FT_Done_FreeType(lib);
253 av_log(ctx, AV_LOG_WARNING, "Error while loading freetype font, using default font instead\n");
255 FT_Done_FreeType(lib);
256 av_freep(&s->font_alpha);
261 static double a_weighting(void *p, double f)
263 double ret = 12200.0*12200.0 * (f*f*f*f);
264 ret /= (f*f + 20.6*20.6) * (f*f + 12200.0*12200.0) *
265 sqrt((f*f + 107.7*107.7) * (f*f + 737.9*737.9));
269 static double b_weighting(void *p, double f)
271 double ret = 12200.0*12200.0 * (f*f*f);
272 ret /= (f*f + 20.6*20.6) * (f*f + 12200.0*12200.0) * sqrt(f*f + 158.5*158.5);
276 static double c_weighting(void *p, double f)
278 double ret = 12200.0*12200.0 * (f*f);
279 ret /= (f*f + 20.6*20.6) * (f*f + 12200.0*12200.0);
283 static double midi(void *p, double f)
285 return log2(f/440.0) * 12.0 + 69.0;
288 static double r_func(void *p, double x)
290 x = av_clipd(x, 0.0, 1.0);
291 return (int)(x*255.0+0.5) << 16;
294 static double g_func(void *p, double x)
296 x = av_clipd(x, 0.0, 1.0);
297 return (int)(x*255.0+0.5) << 8;
300 static double b_func(void *p, double x)
302 x = av_clipd(x, 0.0, 1.0);
303 return (int)(x*255.0+0.5);
306 static inline int qsort_sparsecoeff(const SparseCoeff *a, const SparseCoeff *b)
308 if (fabsf(a->value) >= fabsf(b->value))
314 static int config_output(AVFilterLink *outlink)
316 AVFilterContext *ctx = outlink->src;
317 AVFilterLink *inlink = ctx->inputs[0];
318 ShowCQTContext *s = ctx->priv;
319 AVExpr *tlength_expr = NULL, *volume_expr = NULL, *fontcolor_expr = NULL;
320 uint8_t *fontcolor_value = s->fontcolor_value;
321 static const char * const expr_vars[] = { "timeclamp", "tc", "frequency", "freq", "f", NULL };
322 static const char * const expr_func_names[] = { "a_weighting", "b_weighting", "c_weighting", NULL };
323 static const char * const expr_fontcolor_func_names[] = { "midi", "r", "g", "b", NULL };
324 static double (* const expr_funcs[])(void *, double) = { a_weighting, b_weighting, c_weighting, NULL };
325 static double (* const expr_fontcolor_funcs[])(void *, double) = { midi, r_func, g_func, b_func, NULL };
326 int fft_len, k, x, y, ret;
328 int rate = inlink->sample_rate;
329 double max_len = rate * (double) s->timeclamp;
330 int64_t start_time, end_time;
331 int video_scale = s->fullhd ? 2 : 1;
332 int video_width = (VIDEO_WIDTH/2) * video_scale;
333 int video_height = (VIDEO_HEIGHT/2) * video_scale;
334 int spectogram_height = (SPECTOGRAM_HEIGHT/2) * video_scale;
336 s->fft_bits = ceil(log2(max_len));
337 fft_len = 1 << s->fft_bits;
339 if (rate % (s->fps * s->count)) {
340 av_log(ctx, AV_LOG_ERROR, "Rate (%u) is not divisible by fps*count (%u*%u)\n", rate, s->fps, s->count);
341 return AVERROR(EINVAL);
344 s->fft_data = av_malloc_array(fft_len, sizeof(*s->fft_data));
345 s->coeff_sort = av_malloc_array(fft_len, sizeof(*s->coeff_sort));
346 s->fft_result = av_malloc_array(fft_len + 1, sizeof(*s->fft_result));
347 s->fft_context = av_fft_init(s->fft_bits, 0);
349 if (!s->fft_data || !s->coeff_sort || !s->fft_result || !s->fft_context)
350 return AVERROR(ENOMEM);
352 #if CONFIG_LIBFREETYPE
353 load_freetype_font(ctx);
356 av_log(ctx, AV_LOG_WARNING, "Freetype is not available, ignoring fontfile option\n");
357 s->font_alpha = NULL;
360 av_log(ctx, AV_LOG_INFO, "Calculating spectral kernel, please wait\n");
361 start_time = av_gettime_relative();
362 ret = av_expr_parse(&tlength_expr, s->tlength, expr_vars, NULL, NULL, NULL, NULL, 0, ctx);
366 ret = av_expr_parse(&volume_expr, s->volume, expr_vars, expr_func_names,
367 expr_funcs, NULL, NULL, 0, ctx);
371 ret = av_expr_parse(&fontcolor_expr, s->fontcolor, expr_vars, expr_fontcolor_func_names,
372 expr_fontcolor_funcs, NULL, NULL, 0, ctx);
376 for (k = 0; k < VIDEO_WIDTH; k++) {
377 int hlen = fft_len >> 1;
380 double freq = BASE_FREQ * exp2(k * (1.0/192.0));
381 double tlen, tlength, volume;
382 double expr_vars_val[] = { s->timeclamp, s->timeclamp, freq, freq, freq, 0 };
383 /* a window function from Albert H. Nuttall,
384 * "Some Windows with Very Good Sidelobe Behavior"
385 * -93.32 dB peak sidelobe and 18 dB/octave asymptotic decay
386 * coefficient normalized to a0 = 1 */
387 double a0 = 0.355768;
388 double a1 = 0.487396/a0;
389 double a2 = 0.144232/a0;
390 double a3 = 0.012604/a0;
391 double sv_step, cv_step, sv, cv;
392 double sw_step, cw_step, sw, cw, w;
394 tlength = av_expr_eval(tlength_expr, expr_vars_val, NULL);
395 if (isnan(tlength)) {
396 av_log(ctx, AV_LOG_WARNING, "at freq %g: tlength is nan, setting it to %g\n", freq, s->timeclamp);
397 tlength = s->timeclamp;
398 } else if (tlength < TLENGTH_MIN) {
399 av_log(ctx, AV_LOG_WARNING, "at freq %g: tlength is %g, setting it to %g\n", freq, tlength, TLENGTH_MIN);
400 tlength = TLENGTH_MIN;
401 } else if (tlength > s->timeclamp) {
402 av_log(ctx, AV_LOG_WARNING, "at freq %g: tlength is %g, setting it to %g\n", freq, tlength, s->timeclamp);
403 tlength = s->timeclamp;
406 volume = FFABS(av_expr_eval(volume_expr, expr_vars_val, NULL));
408 av_log(ctx, AV_LOG_WARNING, "at freq %g: volume is nan, setting it to 0\n", freq);
410 } else if (volume < VOLUME_MIN) {
412 } else if (volume > VOLUME_MAX) {
413 av_log(ctx, AV_LOG_WARNING, "at freq %g: volume is %g, setting it to %g\n", freq, volume, VOLUME_MAX);
417 if (s->fullhd || !(k & 1)) {
418 int fontcolor = av_expr_eval(fontcolor_expr, expr_vars_val, NULL);
419 fontcolor_value[0] = (fontcolor >> 16) & 0xFF;
420 fontcolor_value[1] = (fontcolor >> 8) & 0xFF;
421 fontcolor_value[2] = fontcolor & 0xFF;
422 fontcolor_value += 3;
425 tlen = tlength * rate;
426 s->fft_data[0].re = 0;
427 s->fft_data[0].im = 0;
428 s->fft_data[hlen].re = (1.0 + a1 + a2 + a3) * (1.0/tlen) * volume * (1.0/fft_len);
429 s->fft_data[hlen].im = 0;
430 sv_step = sv = sin(2.0*M_PI*freq*(1.0/rate));
431 cv_step = cv = cos(2.0*M_PI*freq*(1.0/rate));
432 /* also optimizing window func */
433 sw_step = sw = sin(2.0*M_PI*(1.0/tlen));
434 cw_step = cw = cos(2.0*M_PI*(1.0/tlen));
435 for (x = 1; x < 0.5 * tlen; x++) {
436 double cv_tmp, cw_tmp;
437 double cw2, cw3, sw2;
439 cw2 = cw * cw - sw * sw;
440 sw2 = cw * sw + sw * cw;
441 cw3 = cw * cw2 - sw * sw2;
442 w = (1.0 + a1 * cw + a2 * cw2 + a3 * cw3) * (1.0/tlen) * volume * (1.0/fft_len);
443 s->fft_data[hlen + x].re = w * cv;
444 s->fft_data[hlen + x].im = w * sv;
445 s->fft_data[hlen - x].re = s->fft_data[hlen + x].re;
446 s->fft_data[hlen - x].im = -s->fft_data[hlen + x].im;
448 cv_tmp = cv * cv_step - sv * sv_step;
449 sv = sv * cv_step + cv * sv_step;
451 cw_tmp = cw * cw_step - sw * sw_step;
452 sw = sw * cw_step + cw * sw_step;
455 for (; x < hlen; x++) {
456 s->fft_data[hlen + x].re = 0;
457 s->fft_data[hlen + x].im = 0;
458 s->fft_data[hlen - x].re = 0;
459 s->fft_data[hlen - x].im = 0;
461 av_fft_permute(s->fft_context, s->fft_data);
462 av_fft_calc(s->fft_context, s->fft_data);
464 for (x = 0; x < fft_len; x++) {
465 s->coeff_sort[x].index = x;
466 s->coeff_sort[x].value = s->fft_data[x].re;
469 AV_QSORT(s->coeff_sort, fft_len, SparseCoeff, qsort_sparsecoeff);
470 for (x = 0; x < fft_len; x++)
471 total += fabsf(s->coeff_sort[x].value);
473 for (x = 0; x < fft_len; x++) {
474 partial += fabsf(s->coeff_sort[x].value);
475 if (partial > total * s->coeffclamp * COEFF_CLAMP) {
476 s->coeffs_len[k] = fft_len - x;
477 num_coeffs += s->coeffs_len[k];
478 s->coeffs[k] = av_malloc_array(s->coeffs_len[k], sizeof(*s->coeffs[k]));
480 ret = AVERROR(ENOMEM);
483 for (y = 0; y < s->coeffs_len[k]; y++)
484 s->coeffs[k][y] = s->coeff_sort[x+y];
489 av_expr_free(fontcolor_expr);
490 av_expr_free(volume_expr);
491 av_expr_free(tlength_expr);
492 end_time = av_gettime_relative();
493 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);
495 outlink->w = video_width;
496 outlink->h = video_height;
498 s->req_fullfilled = 0;
499 s->spectogram_index = 0;
501 s->spectogram_count = 0;
502 s->remaining_fill = fft_len >> 1;
503 memset(s->fft_data, 0, fft_len * sizeof(*s->fft_data));
505 s->outpicref = ff_get_video_buffer(outlink, outlink->w, outlink->h);
507 return AVERROR(ENOMEM);
509 s->spectogram = av_calloc(spectogram_height, s->outpicref->linesize[0]);
511 return AVERROR(ENOMEM);
513 outlink->sample_aspect_ratio = av_make_q(1, 1);
514 outlink->time_base = av_make_q(1, s->fps);
515 outlink->frame_rate = av_make_q(s->fps, 1);
519 av_expr_free(fontcolor_expr);
520 av_expr_free(volume_expr);
521 av_expr_free(tlength_expr);
525 static int plot_cqt(AVFilterLink *inlink)
527 AVFilterContext *ctx = inlink->dst;
528 ShowCQTContext *s = ctx->priv;
529 AVFilterLink *outlink = ctx->outputs[0];
530 int fft_len = 1 << s->fft_bits;
531 FFTSample result[VIDEO_WIDTH][4];
533 int linesize = s->outpicref->linesize[0];
534 int video_scale = s->fullhd ? 2 : 1;
535 int video_width = (VIDEO_WIDTH/2) * video_scale;
536 int spectogram_height = (SPECTOGRAM_HEIGHT/2) * video_scale;
537 int spectogram_start = (SPECTOGRAM_START/2) * video_scale;
538 int font_height = (FONT_HEIGHT/2) * video_scale;
540 /* real part contains left samples, imaginary part contains right samples */
541 memcpy(s->fft_result, s->fft_data, fft_len * sizeof(*s->fft_data));
542 av_fft_permute(s->fft_context, s->fft_result);
543 av_fft_calc(s->fft_context, s->fft_result);
544 s->fft_result[fft_len] = s->fft_result[0];
546 /* calculating cqt */
547 for (x = 0; x < VIDEO_WIDTH; x++) {
549 FFTComplex v = {0,0};
550 FFTComplex w = {0,0};
553 for (u = 0; u < s->coeffs_len[x]; u++) {
554 FFTSample value = s->coeffs[x][u].value;
555 int index = s->coeffs[x][u].index;
556 v.re += value * s->fft_result[index].re;
557 v.im += value * s->fft_result[index].im;
558 w.re += value * s->fft_result[fft_len - index].re;
559 w.im += value * s->fft_result[fft_len - index].im;
562 /* separate left and right, (and multiply by 2.0) */
567 /* result is power, not amplitude */
568 result[x][0] = l.re * l.re + l.im * l.im;
569 result[x][2] = r.re * r.re + r.im * r.im;
570 result[x][1] = 0.5f * (result[x][0] + result[x][2]);
572 if (s->gamma2 == 1.0f)
573 result[x][3] = result[x][1];
574 else if (s->gamma2 == 2.0f)
575 result[x][3] = sqrtf(result[x][1]);
576 else if (s->gamma2 == 3.0f)
577 result[x][3] = cbrtf(result[x][1]);
578 else if (s->gamma2 == 4.0f)
579 result[x][3] = sqrtf(sqrtf(result[x][1]));
581 result[x][3] = expf(logf(result[x][1]) * (1.0f / s->gamma2));
583 result[x][0] = FFMIN(1.0f, result[x][0]);
584 result[x][1] = FFMIN(1.0f, result[x][1]);
585 result[x][2] = FFMIN(1.0f, result[x][2]);
586 if (s->gamma == 1.0f) {
587 result[x][0] = 255.0f * result[x][0];
588 result[x][1] = 255.0f * result[x][1];
589 result[x][2] = 255.0f * result[x][2];
590 } else if (s->gamma == 2.0f) {
591 result[x][0] = 255.0f * sqrtf(result[x][0]);
592 result[x][1] = 255.0f * sqrtf(result[x][1]);
593 result[x][2] = 255.0f * sqrtf(result[x][2]);
594 } else if (s->gamma == 3.0f) {
595 result[x][0] = 255.0f * cbrtf(result[x][0]);
596 result[x][1] = 255.0f * cbrtf(result[x][1]);
597 result[x][2] = 255.0f * cbrtf(result[x][2]);
598 } else if (s->gamma == 4.0f) {
599 result[x][0] = 255.0f * sqrtf(sqrtf(result[x][0]));
600 result[x][1] = 255.0f * sqrtf(sqrtf(result[x][1]));
601 result[x][2] = 255.0f * sqrtf(sqrtf(result[x][2]));
603 result[x][0] = 255.0f * expf(logf(result[x][0]) * (1.0f / s->gamma));
604 result[x][1] = 255.0f * expf(logf(result[x][1]) * (1.0f / s->gamma));
605 result[x][2] = 255.0f * expf(logf(result[x][2]) * (1.0f / s->gamma));
610 for (x = 0; x < video_width; x++) {
611 result[x][0] = 0.5f * (result[2*x][0] + result[2*x+1][0]);
612 result[x][1] = 0.5f * (result[2*x][1] + result[2*x+1][1]);
613 result[x][2] = 0.5f * (result[2*x][2] + result[2*x+1][2]);
614 result[x][3] = 0.5f * (result[2*x][3] + result[2*x+1][3]);
618 for (x = 0; x < video_width; x++) {
619 s->spectogram[s->spectogram_index*linesize + 3*x] = result[x][0] + 0.5f;
620 s->spectogram[s->spectogram_index*linesize + 3*x + 1] = result[x][1] + 0.5f;
621 s->spectogram[s->spectogram_index*linesize + 3*x + 2] = result[x][2] + 0.5f;
625 if (!s->spectogram_count) {
626 uint8_t *data = (uint8_t*) s->outpicref->data[0];
627 float rcp_result[VIDEO_WIDTH];
628 int total_length = linesize * spectogram_height;
629 int back_length = linesize * s->spectogram_index;
631 for (x = 0; x < video_width; x++)
632 rcp_result[x] = 1.0f / (result[x][3]+0.0001f);
635 for (y = 0; y < spectogram_height; y++) {
636 float height = (spectogram_height - y) * (1.0f/spectogram_height);
637 uint8_t *lineptr = data + y * linesize;
638 for (x = 0; x < video_width; x++) {
640 if (result[x][3] <= height) {
645 mul = (result[x][3] - height) * rcp_result[x];
646 *lineptr++ = mul * result[x][0] + 0.5f;
647 *lineptr++ = mul * result[x][1] + 0.5f;
648 *lineptr++ = mul * result[x][2] + 0.5f;
655 for (y = 0; y < font_height; y++) {
656 uint8_t *lineptr = data + (spectogram_height + y) * linesize;
657 uint8_t *spectogram_src = s->spectogram + s->spectogram_index * linesize;
658 uint8_t *fontcolor_value = s->fontcolor_value;
659 for (x = 0; x < video_width; x++) {
660 uint8_t alpha = s->font_alpha[y*video_width+x];
661 lineptr[3*x] = (spectogram_src[3*x] * (255-alpha) + fontcolor_value[0] * alpha + 255) >> 8;
662 lineptr[3*x+1] = (spectogram_src[3*x+1] * (255-alpha) + fontcolor_value[1] * alpha + 255) >> 8;
663 lineptr[3*x+2] = (spectogram_src[3*x+2] * (255-alpha) + fontcolor_value[2] * alpha + 255) >> 8;
664 fontcolor_value += 3;
668 for (y = 0; y < font_height; y++) {
669 uint8_t *lineptr = data + (spectogram_height + y) * linesize;
670 memcpy(lineptr, s->spectogram + s->spectogram_index * linesize, video_width*3);
672 for (x = 0; x < video_width; x += video_width/10) {
674 static const char str[] = "EF G A BC D ";
675 uint8_t *startptr = data + spectogram_height * linesize + x * 3;
676 for (u = 0; str[u]; u++) {
678 for (v = 0; v < 16; v++) {
679 uint8_t *p = startptr + v * linesize * video_scale + 8 * 3 * u * video_scale;
680 int ux = x + 8 * u * video_scale;
682 for (mask = 0x80; mask; mask >>= 1) {
683 if (mask & avpriv_vga16_font[str[u] * 16 + v]) {
684 p[0] = s->fontcolor_value[3*ux];
685 p[1] = s->fontcolor_value[3*ux+1];
686 p[2] = s->fontcolor_value[3*ux+2];
687 if (video_scale == 2) {
689 p[linesize+1] = p[1];
690 p[linesize+2] = p[2];
691 p[3] = p[linesize+3] = s->fontcolor_value[3*ux+3];
692 p[4] = p[linesize+4] = s->fontcolor_value[3*ux+4];
693 p[5] = p[linesize+5] = s->fontcolor_value[3*ux+5];
696 p += 3 * video_scale;
704 /* drawing spectogram/sonogram */
705 data += spectogram_start * linesize;
706 memcpy(data, s->spectogram + s->spectogram_index*linesize, total_length - back_length);
708 data += total_length - back_length;
710 memcpy(data, s->spectogram, back_length);
712 s->outpicref->pts = s->frame_count;
713 ret = ff_filter_frame(outlink, av_frame_clone(s->outpicref));
714 s->req_fullfilled = 1;
717 s->spectogram_count = (s->spectogram_count + 1) % s->count;
718 s->spectogram_index = (s->spectogram_index + spectogram_height - 1) % spectogram_height;
722 static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
724 AVFilterContext *ctx = inlink->dst;
725 ShowCQTContext *s = ctx->priv;
726 int step = inlink->sample_rate / (s->fps * s->count);
727 int fft_len = 1 << s->fft_bits;
732 while (s->remaining_fill < (fft_len >> 1)) {
734 memset(&s->fft_data[fft_len - s->remaining_fill], 0, sizeof(*s->fft_data) * s->remaining_fill);
735 ret = plot_cqt(inlink);
738 for (x = 0; x < (fft_len-step); x++)
739 s->fft_data[x] = s->fft_data[x+step];
740 s->remaining_fill += step;
745 remaining = insamples->nb_samples;
746 audio_data = (float*) insamples->data[0];
749 if (remaining >= s->remaining_fill) {
750 int i = insamples->nb_samples - remaining;
751 int j = fft_len - s->remaining_fill;
753 for (m = 0; m < s->remaining_fill; m++) {
754 s->fft_data[j+m].re = audio_data[2*(i+m)];
755 s->fft_data[j+m].im = audio_data[2*(i+m)+1];
757 ret = plot_cqt(inlink);
759 av_frame_free(&insamples);
762 remaining -= s->remaining_fill;
763 for (m = 0; m < fft_len-step; m++)
764 s->fft_data[m] = s->fft_data[m+step];
765 s->remaining_fill = step;
767 int i = insamples->nb_samples - remaining;
768 int j = fft_len - s->remaining_fill;
770 for (m = 0; m < remaining; m++) {
771 s->fft_data[m+j].re = audio_data[2*(i+m)];
772 s->fft_data[m+j].im = audio_data[2*(i+m)+1];
774 s->remaining_fill -= remaining;
778 av_frame_free(&insamples);
782 static int request_frame(AVFilterLink *outlink)
784 ShowCQTContext *s = outlink->src->priv;
785 AVFilterLink *inlink = outlink->src->inputs[0];
788 s->req_fullfilled = 0;
790 ret = ff_request_frame(inlink);
791 } while (!s->req_fullfilled && ret >= 0);
793 if (ret == AVERROR_EOF && s->outpicref)
794 filter_frame(inlink, NULL);
798 static const AVFilterPad showcqt_inputs[] = {
801 .type = AVMEDIA_TYPE_AUDIO,
802 .filter_frame = filter_frame,
807 static const AVFilterPad showcqt_outputs[] = {
810 .type = AVMEDIA_TYPE_VIDEO,
811 .config_props = config_output,
812 .request_frame = request_frame,
817 AVFilter ff_avf_showcqt = {
819 .description = NULL_IF_CONFIG_SMALL("Convert input audio to a CQT (Constant Q Transform) spectrum video output."),
821 .query_formats = query_formats,
822 .priv_size = sizeof(ShowCQTContext),
823 .inputs = showcqt_inputs,
824 .outputs = showcqt_outputs,
825 .priv_class = &showcqt_class,