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"
35 #if CONFIG_LIBFREETYPE
37 #include FT_FREETYPE_H
40 /* this filter is designed to do 16 bins/semitones constant Q transform with Brown-Puckette algorithm
41 * start from E0 to D#10 (10 octaves)
42 * so there are 16 bins/semitones * 12 semitones/octaves * 10 octaves = 1920 bins
43 * match with full HD resolution */
45 #define VIDEO_WIDTH 1920
46 #define VIDEO_HEIGHT 1080
47 #define FONT_HEIGHT 32
48 #define SPECTOGRAM_HEIGHT ((VIDEO_HEIGHT-FONT_HEIGHT)/2)
49 #define SPECTOGRAM_START (VIDEO_HEIGHT-SPECTOGRAM_HEIGHT)
50 #define BASE_FREQ 20.051392800492
51 #define COEFF_CLAMP 1.0e-4
61 FFTContext *fft_context;
63 FFTComplex *fft_result_left;
64 FFTComplex *fft_result_right;
66 SparseCoeff *coeff_sort;
67 SparseCoeff *coeffs[VIDEO_WIDTH];
69 char *fontfile; /* using freetype */
70 int coeffs_len[VIDEO_WIDTH];
71 uint8_t font_color[VIDEO_WIDTH];
79 double timeclamp; /* lower timeclamp, time-accurate, higher timeclamp, freq-accurate (at low freq)*/
80 float coeffclamp; /* lower coeffclamp, more precise, higher coeffclamp, faster */
81 int fullhd; /* if true, output video is at full HD resolution, otherwise it will be halved */
82 float gamma; /* lower gamma, more contrast, higher gamma, more range */
83 int fps; /* the required fps is so strict, so it's enough to be int, but 24000/1001 etc cannot be encoded */
84 int count; /* fps * count = transform rate */
87 #define OFFSET(x) offsetof(ShowCQTContext, x)
88 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
90 static const AVOption showcqt_options[] = {
91 { "volume", "set volume", OFFSET(volume), AV_OPT_TYPE_DOUBLE, { .dbl = 16 }, 0.1, 100, FLAGS },
92 { "timeclamp", "set timeclamp", OFFSET(timeclamp), AV_OPT_TYPE_DOUBLE, { .dbl = 0.17 }, 0.1, 1.0, FLAGS },
93 { "coeffclamp", "set coeffclamp", OFFSET(coeffclamp), AV_OPT_TYPE_FLOAT, { .dbl = 1 }, 0.1, 10, FLAGS },
94 { "gamma", "set gamma", OFFSET(gamma), AV_OPT_TYPE_FLOAT, { .dbl = 3 }, 1, 7, FLAGS },
95 { "fullhd", "set full HD resolution", OFFSET(fullhd), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, FLAGS },
96 { "fps", "set video fps", OFFSET(fps), AV_OPT_TYPE_INT, { .i64 = 25 }, 10, 100, FLAGS },
97 { "count", "set number of transform per frame", OFFSET(count), AV_OPT_TYPE_INT, { .i64 = 6 }, 1, 30, FLAGS },
98 { "fontfile", "set font file", OFFSET(fontfile), AV_OPT_TYPE_STRING, { .str = NULL }, CHAR_MIN, CHAR_MAX, FLAGS },
102 AVFILTER_DEFINE_CLASS(showcqt);
104 static av_cold void uninit(AVFilterContext *ctx)
108 ShowCQTContext *s = ctx->priv;
109 av_fft_end(s->fft_context);
110 s->fft_context = NULL;
111 for (k = 0; k < VIDEO_WIDTH; k++)
112 av_freep(&s->coeffs[k]);
113 av_freep(&s->fft_data);
114 av_freep(&s->fft_result_left);
115 av_freep(&s->fft_result_right);
116 av_freep(&s->coeff_sort);
117 av_freep(&s->spectogram);
118 av_freep(&s->font_alpha);
119 av_frame_free(&s->outpicref);
122 static int query_formats(AVFilterContext *ctx)
124 AVFilterFormats *formats = NULL;
125 AVFilterChannelLayouts *layouts = NULL;
126 AVFilterLink *inlink = ctx->inputs[0];
127 AVFilterLink *outlink = ctx->outputs[0];
128 static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_NONE };
129 static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_RGB24, AV_PIX_FMT_NONE };
130 static const int64_t channel_layouts[] = { AV_CH_LAYOUT_STEREO, AV_CH_LAYOUT_STEREO_DOWNMIX, -1 };
131 static const int samplerates[] = { 44100, 48000, -1 };
133 /* set input audio formats */
134 formats = ff_make_format_list(sample_fmts);
136 return AVERROR(ENOMEM);
137 ff_formats_ref(formats, &inlink->out_formats);
139 layouts = avfilter_make_format64_list(channel_layouts);
141 return AVERROR(ENOMEM);
142 ff_channel_layouts_ref(layouts, &inlink->out_channel_layouts);
144 formats = ff_make_format_list(samplerates);
146 return AVERROR(ENOMEM);
147 ff_formats_ref(formats, &inlink->out_samplerates);
149 /* set output video format */
150 formats = ff_make_format_list(pix_fmts);
152 return AVERROR(ENOMEM);
153 ff_formats_ref(formats, &outlink->in_formats);
158 #if CONFIG_LIBFREETYPE
159 static void load_freetype_font(AVFilterContext *ctx)
161 static const char str[] = "EF G A BC D ";
162 ShowCQTContext *s = ctx->priv;
163 FT_Library lib = NULL;
165 int video_scale = s->fullhd ? 2 : 1;
166 int video_width = (VIDEO_WIDTH/2) * video_scale;
167 int font_height = (FONT_HEIGHT/2) * video_scale;
168 int font_width = 8 * video_scale;
169 int font_repeat = font_width * 12;
170 int linear_hori_advance = font_width * 65536;
171 int non_monospace_warning = 0;
174 s->font_alpha = NULL;
179 if (FT_Init_FreeType(&lib))
182 if (FT_New_Face(lib, s->fontfile, 0, &face))
185 if (FT_Set_Char_Size(face, 16*64, 0, 0, 0))
188 if (FT_Load_Char(face, 'A', FT_LOAD_RENDER))
191 if (FT_Set_Char_Size(face, 16*64 * linear_hori_advance / face->glyph->linearHoriAdvance, 0, 0, 0))
194 s->font_alpha = av_malloc(font_height * video_width);
198 memset(s->font_alpha, 0, font_height * video_width);
200 for (x = 0; x < 12; x++) {
201 int sx, sy, rx, bx, by, dx, dy;
206 if (FT_Load_Char(face, str[x], FT_LOAD_RENDER))
209 if (face->glyph->advance.x != font_width*64 && !non_monospace_warning) {
210 av_log(ctx, AV_LOG_WARNING, "Font is not monospace\n");
211 non_monospace_warning = 1;
214 sy = font_height - 4*video_scale - face->glyph->bitmap_top;
215 for (rx = 0; rx < 10; rx++) {
216 sx = rx * font_repeat + x * font_width + face->glyph->bitmap_left;
217 for (by = 0; by < face->glyph->bitmap.rows; by++) {
221 if (dy >= font_height)
224 for (bx = 0; bx < face->glyph->bitmap.width; bx++) {
228 if (dx >= video_width)
230 s->font_alpha[dy*video_width+dx] = face->glyph->bitmap.buffer[by*face->glyph->bitmap.width+bx];
237 FT_Done_FreeType(lib);
241 av_log(ctx, AV_LOG_WARNING, "Error while loading freetype font, using default font instead\n");
243 FT_Done_FreeType(lib);
244 av_freep(&s->font_alpha);
249 static inline int qsort_sparsecoeff(const SparseCoeff *a, const SparseCoeff *b)
251 if (fabsf(a->value) >= fabsf(b->value))
257 static int config_output(AVFilterLink *outlink)
259 AVFilterContext *ctx = outlink->src;
260 AVFilterLink *inlink = ctx->inputs[0];
261 ShowCQTContext *s = ctx->priv;
262 int fft_len, k, x, y;
264 int rate = inlink->sample_rate;
265 double max_len = rate * (double) s->timeclamp;
266 int64_t start_time, end_time;
267 int video_scale = s->fullhd ? 2 : 1;
268 int video_width = (VIDEO_WIDTH/2) * video_scale;
269 int video_height = (VIDEO_HEIGHT/2) * video_scale;
270 int spectogram_height = (SPECTOGRAM_HEIGHT/2) * video_scale;
272 s->fft_bits = ceil(log2(max_len));
273 fft_len = 1 << s->fft_bits;
275 if (rate % (s->fps * s->count)) {
276 av_log(ctx, AV_LOG_ERROR, "Rate (%u) is not divisible by fps*count (%u*%u)\n", rate, s->fps, s->count);
277 return AVERROR(EINVAL);
280 s->fft_data = av_malloc_array(fft_len, sizeof(*s->fft_data));
281 s->coeff_sort = av_malloc_array(fft_len, sizeof(*s->coeff_sort));
282 s->fft_result_left = av_malloc_array(fft_len, sizeof(*s->fft_result_left));
283 s->fft_result_right = av_malloc_array(fft_len, sizeof(*s->fft_result_right));
284 s->fft_context = av_fft_init(s->fft_bits, 0);
286 if (!s->fft_data || !s->coeff_sort || !s->fft_result_left || !s->fft_result_right || !s->fft_context)
287 return AVERROR(ENOMEM);
289 /* initializing font */
290 for (x = 0; x < video_width; x++) {
291 if (x >= (12*3+8)*8*video_scale && x < (12*4+8)*8*video_scale) {
292 float fx = (x-(12*3+8)*8*video_scale) * (2.0f/(192.0f*video_scale));
293 float sv = sinf(M_PI*fx);
294 s->font_color[x] = sv*sv*255.0f + 0.5f;
296 s->font_color[x] = 0;
300 #if CONFIG_LIBFREETYPE
301 load_freetype_font(ctx);
304 av_log(ctx, AV_LOG_WARNING, "Freetype is not available, ignoring fontfile option\n");
305 s->font_alpha = NULL;
308 av_log(ctx, AV_LOG_INFO, "Calculating spectral kernel, please wait\n");
309 start_time = av_gettime_relative();
310 for (k = 0; k < VIDEO_WIDTH; k++) {
311 int hlen = fft_len >> 1;
314 double freq = BASE_FREQ * exp2(k * (1.0/192.0));
315 double tlen = rate * (24.0 * 16.0) /freq;
316 /* a window function from Albert H. Nuttall,
317 * "Some Windows with Very Good Sidelobe Behavior"
318 * -93.32 dB peak sidelobe and 18 dB/octave asymptotic decay
319 * coefficient normalized to a0 = 1 */
320 double a0 = 0.355768;
321 double a1 = 0.487396/a0;
322 double a2 = 0.144232/a0;
323 double a3 = 0.012604/a0;
324 double sv_step, cv_step, sv, cv;
325 double sw_step, cw_step, sw, cw, w;
327 tlen = tlen * max_len / (tlen + max_len);
328 s->fft_data[0].re = 0;
329 s->fft_data[0].im = 0;
330 s->fft_data[hlen].re = (1.0 + a1 + a2 + a3) * (1.0/tlen) * s->volume * (1.0/fft_len);
331 s->fft_data[hlen].im = 0;
332 sv_step = sv = sin(2.0*M_PI*freq*(1.0/rate));
333 cv_step = cv = cos(2.0*M_PI*freq*(1.0/rate));
334 /* also optimizing window func */
335 sw_step = sw = sin(2.0*M_PI*(1.0/tlen));
336 cw_step = cw = cos(2.0*M_PI*(1.0/tlen));
337 for (x = 1; x < 0.5 * tlen; x++) {
338 double cv_tmp, cw_tmp;
339 double cw2, cw3, sw2;
341 cw2 = cw * cw - sw * sw;
342 sw2 = cw * sw + sw * cw;
343 cw3 = cw * cw2 - sw * sw2;
344 w = (1.0 + a1 * cw + a2 * cw2 + a3 * cw3) * (1.0/tlen) * s->volume * (1.0/fft_len);
345 s->fft_data[hlen + x].re = w * cv;
346 s->fft_data[hlen + x].im = w * sv;
347 s->fft_data[hlen - x].re = s->fft_data[hlen + x].re;
348 s->fft_data[hlen - x].im = -s->fft_data[hlen + x].im;
350 cv_tmp = cv * cv_step - sv * sv_step;
351 sv = sv * cv_step + cv * sv_step;
353 cw_tmp = cw * cw_step - sw * sw_step;
354 sw = sw * cw_step + cw * sw_step;
357 for (; x < hlen; x++) {
358 s->fft_data[hlen + x].re = 0;
359 s->fft_data[hlen + x].im = 0;
360 s->fft_data[hlen - x].re = 0;
361 s->fft_data[hlen - x].im = 0;
363 av_fft_permute(s->fft_context, s->fft_data);
364 av_fft_calc(s->fft_context, s->fft_data);
366 for (x = 0; x < fft_len; x++) {
367 s->coeff_sort[x].index = x;
368 s->coeff_sort[x].value = s->fft_data[x].re;
371 AV_QSORT(s->coeff_sort, fft_len, SparseCoeff, qsort_sparsecoeff);
372 for (x = 0; x < fft_len; x++)
373 total += fabsf(s->coeff_sort[x].value);
375 for (x = 0; x < fft_len; x++) {
376 partial += fabsf(s->coeff_sort[x].value);
377 if (partial > total * s->coeffclamp * COEFF_CLAMP) {
378 s->coeffs_len[k] = fft_len - x;
379 num_coeffs += s->coeffs_len[k];
380 s->coeffs[k] = av_malloc_array(s->coeffs_len[k], sizeof(*s->coeffs[k]));
382 return AVERROR(ENOMEM);
383 for (y = 0; y < s->coeffs_len[k]; y++)
384 s->coeffs[k][y] = s->coeff_sort[x+y];
389 end_time = av_gettime_relative();
390 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);
392 outlink->w = video_width;
393 outlink->h = video_height;
395 s->req_fullfilled = 0;
396 s->spectogram_index = 0;
398 s->spectogram_count = 0;
399 s->remaining_fill = fft_len >> 1;
400 memset(s->fft_data, 0, fft_len * sizeof(*s->fft_data));
402 s->outpicref = ff_get_video_buffer(outlink, outlink->w, outlink->h);
404 return AVERROR(ENOMEM);
406 s->spectogram = av_calloc(spectogram_height, s->outpicref->linesize[0]);
408 return AVERROR(ENOMEM);
410 outlink->sample_aspect_ratio = av_make_q(1, 1);
411 outlink->time_base = av_make_q(1, s->fps);
412 outlink->frame_rate = av_make_q(s->fps, 1);
416 static int plot_cqt(AVFilterLink *inlink)
418 AVFilterContext *ctx = inlink->dst;
419 ShowCQTContext *s = ctx->priv;
420 AVFilterLink *outlink = ctx->outputs[0];
421 int fft_len = 1 << s->fft_bits;
422 FFTSample result[VIDEO_WIDTH][4];
424 int linesize = s->outpicref->linesize[0];
425 int video_scale = s->fullhd ? 2 : 1;
426 int video_width = (VIDEO_WIDTH/2) * video_scale;
427 int spectogram_height = (SPECTOGRAM_HEIGHT/2) * video_scale;
428 int spectogram_start = (SPECTOGRAM_START/2) * video_scale;
429 int font_height = (FONT_HEIGHT/2) * video_scale;
431 /* real part contains left samples, imaginary part contains right samples */
432 memcpy(s->fft_result_left, s->fft_data, fft_len * sizeof(*s->fft_data));
433 av_fft_permute(s->fft_context, s->fft_result_left);
434 av_fft_calc(s->fft_context, s->fft_result_left);
436 /* separate left and right, (and multiply by 2.0) */
437 s->fft_result_right[0].re = 2.0f * s->fft_result_left[0].im;
438 s->fft_result_right[0].im = 0;
439 s->fft_result_left[0].re = 2.0f * s->fft_result_left[0].re;
440 s->fft_result_left[0].im = 0;
441 for (x = 1; x <= fft_len >> 1; x++) {
442 FFTSample tmpy = s->fft_result_left[fft_len-x].im - s->fft_result_left[x].im;
444 s->fft_result_right[x].re = s->fft_result_left[x].im + s->fft_result_left[fft_len-x].im;
445 s->fft_result_right[x].im = s->fft_result_left[x].re - s->fft_result_left[fft_len-x].re;
446 s->fft_result_right[fft_len-x].re = s->fft_result_right[x].re;
447 s->fft_result_right[fft_len-x].im = -s->fft_result_right[x].im;
449 s->fft_result_left[x].re = s->fft_result_left[x].re + s->fft_result_left[fft_len-x].re;
450 s->fft_result_left[x].im = tmpy;
451 s->fft_result_left[fft_len-x].re = s->fft_result_left[x].re;
452 s->fft_result_left[fft_len-x].im = -s->fft_result_left[x].im;
455 /* calculating cqt */
456 for (x = 0; x < VIDEO_WIDTH; x++) {
458 float g = 1.0f / s->gamma;
459 FFTComplex l = {0,0};
460 FFTComplex r = {0,0};
462 for (u = 0; u < s->coeffs_len[x]; u++) {
463 FFTSample value = s->coeffs[x][u].value;
464 int index = s->coeffs[x][u].index;
465 l.re += value * s->fft_result_left[index].re;
466 l.im += value * s->fft_result_left[index].im;
467 r.re += value * s->fft_result_right[index].re;
468 r.im += value * s->fft_result_right[index].im;
470 /* result is power, not amplitude */
471 result[x][0] = l.re * l.re + l.im * l.im;
472 result[x][2] = r.re * r.re + r.im * r.im;
473 result[x][1] = 0.5f * (result[x][0] + result[x][2]);
474 result[x][3] = result[x][1];
475 result[x][0] = 255.0f * powf(FFMIN(1.0f,result[x][0]), g);
476 result[x][1] = 255.0f * powf(FFMIN(1.0f,result[x][1]), g);
477 result[x][2] = 255.0f * powf(FFMIN(1.0f,result[x][2]), g);
481 for (x = 0; x < video_width; x++) {
482 result[x][0] = 0.5f * (result[2*x][0] + result[2*x+1][0]);
483 result[x][1] = 0.5f * (result[2*x][1] + result[2*x+1][1]);
484 result[x][2] = 0.5f * (result[2*x][2] + result[2*x+1][2]);
485 result[x][3] = 0.5f * (result[2*x][3] + result[2*x+1][3]);
489 for (x = 0; x < video_width; x++) {
490 s->spectogram[s->spectogram_index*linesize + 3*x] = result[x][0] + 0.5f;
491 s->spectogram[s->spectogram_index*linesize + 3*x + 1] = result[x][1] + 0.5f;
492 s->spectogram[s->spectogram_index*linesize + 3*x + 2] = result[x][2] + 0.5f;
496 if (!s->spectogram_count) {
497 uint8_t *data = (uint8_t*) s->outpicref->data[0];
498 float rcp_result[VIDEO_WIDTH];
499 int total_length = linesize * spectogram_height;
500 int back_length = linesize * s->spectogram_index;
502 for (x = 0; x < video_width; x++)
503 rcp_result[x] = 1.0f / (result[x][3]+0.0001f);
506 for (y = 0; y < spectogram_height; y++) {
507 float height = (spectogram_height - y) * (1.0f/spectogram_height);
508 uint8_t *lineptr = data + y * linesize;
509 for (x = 0; x < video_width; x++) {
511 if (result[x][3] <= height) {
516 mul = (result[x][3] - height) * rcp_result[x];
517 *lineptr++ = mul * result[x][0] + 0.5f;
518 *lineptr++ = mul * result[x][1] + 0.5f;
519 *lineptr++ = mul * result[x][2] + 0.5f;
526 for (y = 0; y < font_height; y++) {
527 uint8_t *lineptr = data + (spectogram_height + y) * linesize;
528 uint8_t *spectogram_src = s->spectogram + s->spectogram_index * linesize;
529 for (x = 0; x < video_width; x++) {
530 uint8_t alpha = s->font_alpha[y*video_width+x];
531 uint8_t color = s->font_color[x];
532 lineptr[3*x] = (spectogram_src[3*x] * (255-alpha) + (255-color) * alpha + 255) >> 8;
533 lineptr[3*x+1] = (spectogram_src[3*x+1] * (255-alpha) + 255) >> 8;
534 lineptr[3*x+2] = (spectogram_src[3*x+2] * (255-alpha) + color * alpha + 255) >> 8;
538 for (y = 0; y < font_height; y++) {
539 uint8_t *lineptr = data + (spectogram_height + y) * linesize;
540 memcpy(lineptr, s->spectogram + s->spectogram_index * linesize, video_width*3);
542 for (x = 0; x < video_width; x += video_width/10) {
544 static const char str[] = "EF G A BC D ";
545 uint8_t *startptr = data + spectogram_height * linesize + x * 3;
546 for (u = 0; str[u]; u++) {
548 for (v = 0; v < 16; v++) {
549 uint8_t *p = startptr + v * linesize * video_scale + 8 * 3 * u * video_scale;
550 int ux = x + 8 * u * video_scale;
552 for (mask = 0x80; mask; mask >>= 1) {
553 if (mask & avpriv_vga16_font[str[u] * 16 + v]) {
554 p[0] = 255 - s->font_color[ux];
556 p[2] = s->font_color[ux];
557 if (video_scale == 2) {
559 p[linesize+1] = p[1];
560 p[linesize+2] = p[2];
561 p[3] = p[linesize+3] = 255 - s->font_color[ux+1];
562 p[4] = p[linesize+4] = 0;
563 p[5] = p[linesize+5] = s->font_color[ux+1];
566 p += 3 * video_scale;
574 /* drawing spectogram/sonogram */
575 data += spectogram_start * linesize;
576 memcpy(data, s->spectogram + s->spectogram_index*linesize, total_length - back_length);
578 data += total_length - back_length;
580 memcpy(data, s->spectogram, back_length);
582 s->outpicref->pts = s->frame_count;
583 ret = ff_filter_frame(outlink, av_frame_clone(s->outpicref));
584 s->req_fullfilled = 1;
587 s->spectogram_count = (s->spectogram_count + 1) % s->count;
588 s->spectogram_index = (s->spectogram_index + spectogram_height - 1) % spectogram_height;
592 static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
594 AVFilterContext *ctx = inlink->dst;
595 ShowCQTContext *s = ctx->priv;
596 int step = inlink->sample_rate / (s->fps * s->count);
597 int fft_len = 1 << s->fft_bits;
602 while (s->remaining_fill < (fft_len >> 1)) {
604 memset(&s->fft_data[fft_len - s->remaining_fill], 0, sizeof(*s->fft_data) * s->remaining_fill);
605 ret = plot_cqt(inlink);
608 for (x = 0; x < (fft_len-step); x++)
609 s->fft_data[x] = s->fft_data[x+step];
610 s->remaining_fill += step;
615 remaining = insamples->nb_samples;
616 audio_data = (float*) insamples->data[0];
619 if (remaining >= s->remaining_fill) {
620 int i = insamples->nb_samples - remaining;
621 int j = fft_len - s->remaining_fill;
623 for (m = 0; m < s->remaining_fill; m++) {
624 s->fft_data[j+m].re = audio_data[2*(i+m)];
625 s->fft_data[j+m].im = audio_data[2*(i+m)+1];
627 ret = plot_cqt(inlink);
629 av_frame_free(&insamples);
632 remaining -= s->remaining_fill;
633 for (m = 0; m < fft_len-step; m++)
634 s->fft_data[m] = s->fft_data[m+step];
635 s->remaining_fill = step;
637 int i = insamples->nb_samples - remaining;
638 int j = fft_len - s->remaining_fill;
640 for (m = 0; m < remaining; m++) {
641 s->fft_data[m+j].re = audio_data[2*(i+m)];
642 s->fft_data[m+j].im = audio_data[2*(i+m)+1];
644 s->remaining_fill -= remaining;
648 av_frame_free(&insamples);
652 static int request_frame(AVFilterLink *outlink)
654 ShowCQTContext *s = outlink->src->priv;
655 AVFilterLink *inlink = outlink->src->inputs[0];
658 s->req_fullfilled = 0;
660 ret = ff_request_frame(inlink);
661 } while (!s->req_fullfilled && ret >= 0);
663 if (ret == AVERROR_EOF && s->outpicref)
664 filter_frame(inlink, NULL);
668 static const AVFilterPad showcqt_inputs[] = {
671 .type = AVMEDIA_TYPE_AUDIO,
672 .filter_frame = filter_frame,
677 static const AVFilterPad showcqt_outputs[] = {
680 .type = AVMEDIA_TYPE_VIDEO,
681 .config_props = config_output,
682 .request_frame = request_frame,
687 AVFilter ff_avf_showcqt = {
689 .description = NULL_IF_CONFIG_SMALL("Convert input audio to a CQT (Constant Q Transform) spectrum video output."),
691 .query_formats = query_formats,
692 .priv_size = sizeof(ShowCQTContext),
693 .inputs = showcqt_inputs,
694 .outputs = showcqt_outputs,
695 .priv_class = &showcqt_class,