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/eval.h"
34 #if CONFIG_LIBFREETYPE
36 #include FT_FREETYPE_H
39 /* this filter is designed to do 16 bins/semitones constant Q transform with Brown-Puckette algorithm
40 * start from E0 to D#10 (10 octaves)
41 * so there are 16 bins/semitones * 12 semitones/octaves * 10 octaves = 1920 bins
42 * match with full HD resolution */
44 #define VIDEO_WIDTH 1920
45 #define VIDEO_HEIGHT 1080
46 #define FONT_HEIGHT 32
47 #define SPECTOGRAM_HEIGHT ((VIDEO_HEIGHT-FONT_HEIGHT)/2)
48 #define SPECTOGRAM_START (VIDEO_HEIGHT-SPECTOGRAM_HEIGHT)
49 #define BASE_FREQ 20.051392800492
50 #define TLENGTH_MIN 0.001
51 #define TLENGTH_DEFAULT "384/f*tc/(384/f+tc)"
52 #define VOLUME_MIN 1e-10
53 #define VOLUME_MAX 100.0
54 #define FONTCOLOR_DEFAULT "st(0, (midi(f)-59.5)/12);" \
55 "st(1, if(between(ld(0),0,1), 0.5-0.5*cos(2*PI*ld(0)), 0));" \
56 "r(1-ld(1)) + b(ld(1))"
66 FFTContext *fft_context;
68 FFTComplex *fft_result;
70 Coeffs coeffs[VIDEO_WIDTH];
72 char *fontfile; /* using freetype */
73 uint8_t fontcolor_value[VIDEO_WIDTH*3]; /* result of fontcolor option */
82 double timeclamp; /* lower timeclamp, time-accurate, higher timeclamp, freq-accurate (at low freq)*/
83 float coeffclamp; /* lower coeffclamp, more precise, higher coeffclamp, faster */
84 int fullhd; /* if true, output video is at full HD resolution, otherwise it will be halved */
85 float gamma; /* lower gamma, more contrast, higher gamma, more range */
86 float gamma2; /* gamma of bargraph */
87 int fps; /* the required fps is so strict, so it's enough to be int, but 24000/1001 etc cannot be encoded */
88 int count; /* fps * count = transform rate */
92 #define OFFSET(x) offsetof(ShowCQTContext, x)
93 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
95 static const AVOption showcqt_options[] = {
96 { "volume", "set volume", OFFSET(volume), AV_OPT_TYPE_STRING, { .str = "16" }, CHAR_MIN, CHAR_MAX, FLAGS },
97 { "tlength", "set transform length", OFFSET(tlength), AV_OPT_TYPE_STRING, { .str = TLENGTH_DEFAULT }, CHAR_MIN, CHAR_MAX, FLAGS },
98 { "timeclamp", "set timeclamp", OFFSET(timeclamp), AV_OPT_TYPE_DOUBLE, { .dbl = 0.17 }, 0.1, 1.0, FLAGS },
99 { "coeffclamp", "set coeffclamp", OFFSET(coeffclamp), AV_OPT_TYPE_FLOAT, { .dbl = 1 }, 0.1, 10, FLAGS },
100 { "gamma", "set gamma", OFFSET(gamma), AV_OPT_TYPE_FLOAT, { .dbl = 3 }, 1, 7, FLAGS },
101 { "gamma2", "set gamma of bargraph", OFFSET(gamma2), AV_OPT_TYPE_FLOAT, { .dbl = 1 }, 1, 7, FLAGS },
102 { "fullhd", "set full HD resolution", OFFSET(fullhd), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, FLAGS },
103 { "fps", "set video fps", OFFSET(fps), AV_OPT_TYPE_INT, { .i64 = 25 }, 10, 100, FLAGS },
104 { "count", "set number of transform per frame", OFFSET(count), AV_OPT_TYPE_INT, { .i64 = 6 }, 1, 30, FLAGS },
105 { "fontfile", "set font file", OFFSET(fontfile), AV_OPT_TYPE_STRING, { .str = NULL }, CHAR_MIN, CHAR_MAX, FLAGS },
106 { "fontcolor", "set font color", OFFSET(fontcolor), AV_OPT_TYPE_STRING, { .str = FONTCOLOR_DEFAULT }, CHAR_MIN, CHAR_MAX, FLAGS },
107 { "text", "draw text", OFFSET(draw_text), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, FLAGS },
111 AVFILTER_DEFINE_CLASS(showcqt);
113 static av_cold void uninit(AVFilterContext *ctx)
117 ShowCQTContext *s = ctx->priv;
118 av_fft_end(s->fft_context);
119 s->fft_context = NULL;
120 for (k = 0; k < VIDEO_WIDTH; k++)
121 av_freep(&s->coeffs[k].values);
122 av_freep(&s->fft_data);
123 av_freep(&s->fft_result);
124 av_freep(&s->spectogram);
125 av_freep(&s->font_alpha);
126 av_frame_free(&s->outpicref);
129 static int query_formats(AVFilterContext *ctx)
131 AVFilterFormats *formats = NULL;
132 AVFilterChannelLayouts *layouts = NULL;
133 AVFilterLink *inlink = ctx->inputs[0];
134 AVFilterLink *outlink = ctx->outputs[0];
135 static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_NONE };
136 static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_RGB24, AV_PIX_FMT_NONE };
137 static const int64_t channel_layouts[] = { AV_CH_LAYOUT_STEREO, AV_CH_LAYOUT_STEREO_DOWNMIX, -1 };
138 static const int samplerates[] = { 44100, 48000, -1 };
141 /* set input audio formats */
142 formats = ff_make_format_list(sample_fmts);
143 if ((ret = ff_formats_ref(formats, &inlink->out_formats)) < 0)
146 layouts = avfilter_make_format64_list(channel_layouts);
147 if ((ret = ff_channel_layouts_ref(layouts, &inlink->out_channel_layouts)) < 0)
150 formats = ff_make_format_list(samplerates);
151 if ((ret = ff_formats_ref(formats, &inlink->out_samplerates)) < 0)
154 /* set output video format */
155 formats = ff_make_format_list(pix_fmts);
156 if ((ret = ff_formats_ref(formats, &outlink->in_formats)) < 0)
162 #if CONFIG_LIBFREETYPE
163 static void load_freetype_font(AVFilterContext *ctx)
165 static const char str[] = "EF G A BC D ";
166 ShowCQTContext *s = ctx->priv;
167 FT_Library lib = NULL;
169 int video_scale = s->fullhd ? 2 : 1;
170 int video_width = (VIDEO_WIDTH/2) * video_scale;
171 int font_height = (FONT_HEIGHT/2) * video_scale;
172 int font_width = 8 * video_scale;
173 int font_repeat = font_width * 12;
174 int linear_hori_advance = font_width * 65536;
175 int non_monospace_warning = 0;
178 s->font_alpha = NULL;
183 if (FT_Init_FreeType(&lib))
186 if (FT_New_Face(lib, s->fontfile, 0, &face))
189 if (FT_Set_Char_Size(face, 16*64, 0, 0, 0))
192 if (FT_Load_Char(face, 'A', FT_LOAD_RENDER))
195 if (FT_Set_Char_Size(face, 16*64 * linear_hori_advance / face->glyph->linearHoriAdvance, 0, 0, 0))
198 s->font_alpha = av_malloc_array(font_height, video_width);
202 memset(s->font_alpha, 0, font_height * video_width);
204 for (x = 0; x < 12; x++) {
205 int sx, sy, rx, bx, by, dx, dy;
210 if (FT_Load_Char(face, str[x], FT_LOAD_RENDER))
213 if (face->glyph->advance.x != font_width*64 && !non_monospace_warning) {
214 av_log(ctx, AV_LOG_WARNING, "Font is not monospace\n");
215 non_monospace_warning = 1;
218 sy = font_height - 4*video_scale - face->glyph->bitmap_top;
219 for (rx = 0; rx < 10; rx++) {
220 sx = rx * font_repeat + x * font_width + face->glyph->bitmap_left;
221 for (by = 0; by < face->glyph->bitmap.rows; by++) {
225 if (dy >= font_height)
228 for (bx = 0; bx < face->glyph->bitmap.width; bx++) {
232 if (dx >= video_width)
234 s->font_alpha[dy*video_width+dx] = face->glyph->bitmap.buffer[by*face->glyph->bitmap.width+bx];
241 FT_Done_FreeType(lib);
245 av_log(ctx, AV_LOG_WARNING, "Error while loading freetype font, using default font instead\n");
247 FT_Done_FreeType(lib);
248 av_freep(&s->font_alpha);
253 static double a_weighting(void *p, double f)
255 double ret = 12200.0*12200.0 * (f*f*f*f);
256 ret /= (f*f + 20.6*20.6) * (f*f + 12200.0*12200.0) *
257 sqrt((f*f + 107.7*107.7) * (f*f + 737.9*737.9));
261 static double b_weighting(void *p, double f)
263 double ret = 12200.0*12200.0 * (f*f*f);
264 ret /= (f*f + 20.6*20.6) * (f*f + 12200.0*12200.0) * sqrt(f*f + 158.5*158.5);
268 static double c_weighting(void *p, double f)
270 double ret = 12200.0*12200.0 * (f*f);
271 ret /= (f*f + 20.6*20.6) * (f*f + 12200.0*12200.0);
275 static double midi(void *p, double f)
277 return log2(f/440.0) * 12.0 + 69.0;
280 static double r_func(void *p, double x)
282 x = av_clipd(x, 0.0, 1.0);
283 return (int)(x*255.0+0.5) << 16;
286 static double g_func(void *p, double x)
288 x = av_clipd(x, 0.0, 1.0);
289 return (int)(x*255.0+0.5) << 8;
292 static double b_func(void *p, double x)
294 x = av_clipd(x, 0.0, 1.0);
295 return (int)(x*255.0+0.5);
298 static int config_output(AVFilterLink *outlink)
300 AVFilterContext *ctx = outlink->src;
301 AVFilterLink *inlink = ctx->inputs[0];
302 ShowCQTContext *s = ctx->priv;
303 AVExpr *tlength_expr = NULL, *volume_expr = NULL, *fontcolor_expr = NULL;
304 uint8_t *fontcolor_value = s->fontcolor_value;
305 static const char * const expr_vars[] = { "timeclamp", "tc", "frequency", "freq", "f", NULL };
306 static const char * const expr_func_names[] = { "a_weighting", "b_weighting", "c_weighting", NULL };
307 static const char * const expr_fontcolor_func_names[] = { "midi", "r", "g", "b", NULL };
308 static double (* const expr_funcs[])(void *, double) = { a_weighting, b_weighting, c_weighting, NULL };
309 static double (* const expr_fontcolor_funcs[])(void *, double) = { midi, r_func, g_func, b_func, NULL };
310 int fft_len, k, x, ret;
312 int rate = inlink->sample_rate;
313 double max_len = rate * (double) s->timeclamp;
314 int video_scale = s->fullhd ? 2 : 1;
315 int video_width = (VIDEO_WIDTH/2) * video_scale;
316 int video_height = (VIDEO_HEIGHT/2) * video_scale;
317 int spectogram_height = (SPECTOGRAM_HEIGHT/2) * video_scale;
319 s->fft_bits = ceil(log2(max_len));
320 fft_len = 1 << s->fft_bits;
322 if (rate % (s->fps * s->count)) {
323 av_log(ctx, AV_LOG_ERROR, "Rate (%u) is not divisible by fps*count (%u*%u)\n", rate, s->fps, s->count);
324 return AVERROR(EINVAL);
327 s->fft_data = av_malloc_array(fft_len, sizeof(*s->fft_data));
328 s->fft_result = av_malloc_array(fft_len + 1, sizeof(*s->fft_result));
329 s->fft_context = av_fft_init(s->fft_bits, 0);
331 if (!s->fft_data || !s->fft_result || !s->fft_context)
332 return AVERROR(ENOMEM);
334 #if CONFIG_LIBFREETYPE
335 load_freetype_font(ctx);
338 av_log(ctx, AV_LOG_WARNING, "Freetype is not available, ignoring fontfile option\n");
339 s->font_alpha = NULL;
342 ret = av_expr_parse(&tlength_expr, s->tlength, expr_vars, NULL, NULL, NULL, NULL, 0, ctx);
346 ret = av_expr_parse(&volume_expr, s->volume, expr_vars, expr_func_names,
347 expr_funcs, NULL, NULL, 0, ctx);
351 ret = av_expr_parse(&fontcolor_expr, s->fontcolor, expr_vars, expr_fontcolor_func_names,
352 expr_fontcolor_funcs, NULL, NULL, 0, ctx);
356 for (k = 0; k < VIDEO_WIDTH; k++) {
357 double freq = BASE_FREQ * exp2(k * (1.0/192.0));
358 double flen, center, tlength, volume;
360 double expr_vars_val[] = { s->timeclamp, s->timeclamp, freq, freq, freq, 0 };
362 tlength = av_expr_eval(tlength_expr, expr_vars_val, NULL);
363 if (isnan(tlength)) {
364 av_log(ctx, AV_LOG_WARNING, "at freq %g: tlength is nan, setting it to %g\n", freq, s->timeclamp);
365 tlength = s->timeclamp;
366 } else if (tlength < TLENGTH_MIN) {
367 av_log(ctx, AV_LOG_WARNING, "at freq %g: tlength is %g, setting it to %g\n", freq, tlength, TLENGTH_MIN);
368 tlength = TLENGTH_MIN;
369 } else if (tlength > s->timeclamp) {
370 av_log(ctx, AV_LOG_WARNING, "at freq %g: tlength is %g, setting it to %g\n", freq, tlength, s->timeclamp);
371 tlength = s->timeclamp;
374 volume = fabs(av_expr_eval(volume_expr, expr_vars_val, NULL));
376 av_log(ctx, AV_LOG_WARNING, "at freq %g: volume is nan, setting it to 0\n", freq);
378 } else if (volume < VOLUME_MIN) {
380 } else if (volume > VOLUME_MAX) {
381 av_log(ctx, AV_LOG_WARNING, "at freq %g: volume is %g, setting it to %g\n", freq, volume, VOLUME_MAX);
385 if (s->fullhd || !(k & 1)) {
386 int fontcolor = av_expr_eval(fontcolor_expr, expr_vars_val, NULL);
387 fontcolor_value[0] = (fontcolor >> 16) & 0xFF;
388 fontcolor_value[1] = (fontcolor >> 8) & 0xFF;
389 fontcolor_value[2] = fontcolor & 0xFF;
390 fontcolor_value += 3;
393 /* direct frequency domain windowing */
394 flen = 8.0 * fft_len / (tlength * rate);
395 center = freq * fft_len / rate;
396 start = FFMAX(0, ceil(center - 0.5 * flen));
397 end = FFMIN(fft_len, floor(center + 0.5 * flen));
398 s->coeffs[k].len = end - start + 1;
399 s->coeffs[k].start = start;
400 num_coeffs += s->coeffs[k].len;
401 s->coeffs[k].values = av_malloc_array(s->coeffs[k].len, sizeof(*s->coeffs[k].values));
402 if (!s->coeffs[k].values) {
403 ret = AVERROR(ENOMEM);
406 for (x = start; x <= end; x++) {
407 int sign = (x & 1) ? (-1) : 1;
408 double u = 2.0 * M_PI * (x - center) * (1.0/flen);
410 double w = 0.355768 + 0.487396 * cos(u) + 0.144232 * cos(2*u) + 0.012604 * cos(3*u);
411 s->coeffs[k].values[x-start] = sign * volume * (1.0/fft_len) * w;
414 av_expr_free(fontcolor_expr);
415 av_expr_free(volume_expr);
416 av_expr_free(tlength_expr);
417 av_log(ctx, AV_LOG_INFO, "fft_len=%u, num_coeffs=%u\n", fft_len, num_coeffs);
419 outlink->w = video_width;
420 outlink->h = video_height;
422 s->spectogram_index = 0;
424 s->spectogram_count = 0;
425 s->remaining_fill = fft_len >> 1;
426 memset(s->fft_data, 0, fft_len * sizeof(*s->fft_data));
428 s->outpicref = ff_get_video_buffer(outlink, outlink->w, outlink->h);
430 return AVERROR(ENOMEM);
432 s->spectogram = av_calloc(spectogram_height, s->outpicref->linesize[0]);
434 return AVERROR(ENOMEM);
436 outlink->sample_aspect_ratio = av_make_q(1, 1);
437 outlink->time_base = av_make_q(1, s->fps);
438 outlink->frame_rate = av_make_q(s->fps, 1);
442 av_expr_free(fontcolor_expr);
443 av_expr_free(volume_expr);
444 av_expr_free(tlength_expr);
448 static int plot_cqt(AVFilterLink *inlink)
450 AVFilterContext *ctx = inlink->dst;
451 ShowCQTContext *s = ctx->priv;
452 AVFilterLink *outlink = ctx->outputs[0];
453 int fft_len = 1 << s->fft_bits;
454 FFTSample result[VIDEO_WIDTH][4];
456 int linesize = s->outpicref->linesize[0];
457 int video_scale = s->fullhd ? 2 : 1;
458 int video_width = (VIDEO_WIDTH/2) * video_scale;
459 int spectogram_height = (SPECTOGRAM_HEIGHT/2) * video_scale;
460 int spectogram_start = (SPECTOGRAM_START/2) * video_scale;
461 int font_height = (FONT_HEIGHT/2) * video_scale;
463 /* real part contains left samples, imaginary part contains right samples */
464 memcpy(s->fft_result, s->fft_data, fft_len * sizeof(*s->fft_data));
465 av_fft_permute(s->fft_context, s->fft_result);
466 av_fft_calc(s->fft_context, s->fft_result);
467 s->fft_result[fft_len] = s->fft_result[0];
469 /* calculating cqt */
470 for (x = 0; x < VIDEO_WIDTH; x++) {
472 FFTComplex v = {0,0};
473 FFTComplex w = {0,0};
476 for (u = 0; u < s->coeffs[x].len; u++) {
477 FFTSample value = s->coeffs[x].values[u];
478 int index = s->coeffs[x].start + u;
479 v.re += value * s->fft_result[index].re;
480 v.im += value * s->fft_result[index].im;
481 w.re += value * s->fft_result[fft_len - index].re;
482 w.im += value * s->fft_result[fft_len - index].im;
485 /* separate left and right, (and multiply by 2.0) */
490 /* result is power, not amplitude */
491 result[x][0] = l.re * l.re + l.im * l.im;
492 result[x][2] = r.re * r.re + r.im * r.im;
493 result[x][1] = 0.5f * (result[x][0] + result[x][2]);
495 if (s->gamma2 == 1.0f)
496 result[x][3] = result[x][1];
497 else if (s->gamma2 == 2.0f)
498 result[x][3] = sqrtf(result[x][1]);
499 else if (s->gamma2 == 3.0f)
500 result[x][3] = cbrtf(result[x][1]);
501 else if (s->gamma2 == 4.0f)
502 result[x][3] = sqrtf(sqrtf(result[x][1]));
504 result[x][3] = expf(logf(result[x][1]) * (1.0f / s->gamma2));
506 result[x][0] = FFMIN(1.0f, result[x][0]);
507 result[x][1] = FFMIN(1.0f, result[x][1]);
508 result[x][2] = FFMIN(1.0f, result[x][2]);
509 if (s->gamma == 1.0f) {
510 result[x][0] = 255.0f * result[x][0];
511 result[x][1] = 255.0f * result[x][1];
512 result[x][2] = 255.0f * result[x][2];
513 } else if (s->gamma == 2.0f) {
514 result[x][0] = 255.0f * sqrtf(result[x][0]);
515 result[x][1] = 255.0f * sqrtf(result[x][1]);
516 result[x][2] = 255.0f * sqrtf(result[x][2]);
517 } else if (s->gamma == 3.0f) {
518 result[x][0] = 255.0f * cbrtf(result[x][0]);
519 result[x][1] = 255.0f * cbrtf(result[x][1]);
520 result[x][2] = 255.0f * cbrtf(result[x][2]);
521 } else if (s->gamma == 4.0f) {
522 result[x][0] = 255.0f * sqrtf(sqrtf(result[x][0]));
523 result[x][1] = 255.0f * sqrtf(sqrtf(result[x][1]));
524 result[x][2] = 255.0f * sqrtf(sqrtf(result[x][2]));
526 result[x][0] = 255.0f * expf(logf(result[x][0]) * (1.0f / s->gamma));
527 result[x][1] = 255.0f * expf(logf(result[x][1]) * (1.0f / s->gamma));
528 result[x][2] = 255.0f * expf(logf(result[x][2]) * (1.0f / s->gamma));
533 for (x = 0; x < video_width; x++) {
534 result[x][0] = 0.5f * (result[2*x][0] + result[2*x+1][0]);
535 result[x][1] = 0.5f * (result[2*x][1] + result[2*x+1][1]);
536 result[x][2] = 0.5f * (result[2*x][2] + result[2*x+1][2]);
537 result[x][3] = 0.5f * (result[2*x][3] + result[2*x+1][3]);
541 for (x = 0; x < video_width; x++) {
542 s->spectogram[s->spectogram_index*linesize + 3*x] = result[x][0] + 0.5f;
543 s->spectogram[s->spectogram_index*linesize + 3*x + 1] = result[x][1] + 0.5f;
544 s->spectogram[s->spectogram_index*linesize + 3*x + 2] = result[x][2] + 0.5f;
548 if (!s->spectogram_count) {
549 uint8_t *data = (uint8_t*) s->outpicref->data[0];
550 float rcp_result[VIDEO_WIDTH];
551 int total_length = linesize * spectogram_height;
552 int back_length = linesize * s->spectogram_index;
554 for (x = 0; x < video_width; x++)
555 rcp_result[x] = 1.0f / (result[x][3]+0.0001f);
558 for (y = 0; y < spectogram_height; y++) {
559 float height = (spectogram_height - y) * (1.0f/spectogram_height);
560 uint8_t *lineptr = data + y * linesize;
561 for (x = 0; x < video_width; x++) {
563 if (result[x][3] <= height) {
568 mul = (result[x][3] - height) * rcp_result[x];
569 *lineptr++ = mul * result[x][0] + 0.5f;
570 *lineptr++ = mul * result[x][1] + 0.5f;
571 *lineptr++ = mul * result[x][2] + 0.5f;
577 if (s->font_alpha && s->draw_text) {
578 for (y = 0; y < font_height; y++) {
579 uint8_t *lineptr = data + (spectogram_height + y) * linesize;
580 uint8_t *spectogram_src = s->spectogram + s->spectogram_index * linesize;
581 uint8_t *fontcolor_value = s->fontcolor_value;
582 for (x = 0; x < video_width; x++) {
583 uint8_t alpha = s->font_alpha[y*video_width+x];
584 lineptr[3*x] = (spectogram_src[3*x] * (255-alpha) + fontcolor_value[0] * alpha + 255) >> 8;
585 lineptr[3*x+1] = (spectogram_src[3*x+1] * (255-alpha) + fontcolor_value[1] * alpha + 255) >> 8;
586 lineptr[3*x+2] = (spectogram_src[3*x+2] * (255-alpha) + fontcolor_value[2] * alpha + 255) >> 8;
587 fontcolor_value += 3;
590 } else if (s->draw_text) {
591 for (y = 0; y < font_height; y++) {
592 uint8_t *lineptr = data + (spectogram_height + y) * linesize;
593 memcpy(lineptr, s->spectogram + s->spectogram_index * linesize, video_width*3);
595 for (x = 0; x < video_width; x += video_width/10) {
597 static const char str[] = "EF G A BC D ";
598 uint8_t *startptr = data + spectogram_height * linesize + x * 3;
599 for (u = 0; str[u]; u++) {
601 for (v = 0; v < 16; v++) {
602 uint8_t *p = startptr + v * linesize * video_scale + 8 * 3 * u * video_scale;
603 int ux = x + 8 * u * video_scale;
605 for (mask = 0x80; mask; mask >>= 1) {
606 if (mask & avpriv_vga16_font[str[u] * 16 + v]) {
607 p[0] = s->fontcolor_value[3*ux];
608 p[1] = s->fontcolor_value[3*ux+1];
609 p[2] = s->fontcolor_value[3*ux+2];
610 if (video_scale == 2) {
612 p[linesize+1] = p[1];
613 p[linesize+2] = p[2];
614 p[3] = p[linesize+3] = s->fontcolor_value[3*ux+3];
615 p[4] = p[linesize+4] = s->fontcolor_value[3*ux+4];
616 p[5] = p[linesize+5] = s->fontcolor_value[3*ux+5];
619 p += 3 * video_scale;
626 for (y = 0; y < font_height; y++) {
627 uint8_t *lineptr = data + (spectogram_height + y) * linesize;
628 uint8_t *spectogram_src = s->spectogram + s->spectogram_index * linesize;
629 for (x = 0; x < video_width; x++) {
630 lineptr[3*x] = spectogram_src[3*x];
631 lineptr[3*x+1] = spectogram_src[3*x+1];
632 lineptr[3*x+2] = spectogram_src[3*x+2];
637 /* drawing spectogram/sonogram */
638 data += spectogram_start * linesize;
639 memcpy(data, s->spectogram + s->spectogram_index*linesize, total_length - back_length);
641 data += total_length - back_length;
643 memcpy(data, s->spectogram, back_length);
645 s->outpicref->pts = s->frame_count;
646 ret = ff_filter_frame(outlink, av_frame_clone(s->outpicref));
649 s->spectogram_count = (s->spectogram_count + 1) % s->count;
650 s->spectogram_index = (s->spectogram_index + spectogram_height - 1) % spectogram_height;
654 static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
656 AVFilterContext *ctx = inlink->dst;
657 ShowCQTContext *s = ctx->priv;
658 int step = inlink->sample_rate / (s->fps * s->count);
659 int fft_len = 1 << s->fft_bits;
664 while (s->remaining_fill < (fft_len >> 1)) {
666 memset(&s->fft_data[fft_len - s->remaining_fill], 0, sizeof(*s->fft_data) * s->remaining_fill);
667 ret = plot_cqt(inlink);
670 for (x = 0; x < (fft_len-step); x++)
671 s->fft_data[x] = s->fft_data[x+step];
672 s->remaining_fill += step;
677 remaining = insamples->nb_samples;
678 audio_data = (float*) insamples->data[0];
681 if (remaining >= s->remaining_fill) {
682 int i = insamples->nb_samples - remaining;
683 int j = fft_len - s->remaining_fill;
685 for (m = 0; m < s->remaining_fill; m++) {
686 s->fft_data[j+m].re = audio_data[2*(i+m)];
687 s->fft_data[j+m].im = audio_data[2*(i+m)+1];
689 ret = plot_cqt(inlink);
691 av_frame_free(&insamples);
694 remaining -= s->remaining_fill;
695 for (m = 0; m < fft_len-step; m++)
696 s->fft_data[m] = s->fft_data[m+step];
697 s->remaining_fill = step;
699 int i = insamples->nb_samples - remaining;
700 int j = fft_len - s->remaining_fill;
702 for (m = 0; m < remaining; m++) {
703 s->fft_data[m+j].re = audio_data[2*(i+m)];
704 s->fft_data[m+j].im = audio_data[2*(i+m)+1];
706 s->remaining_fill -= remaining;
710 av_frame_free(&insamples);
714 static int request_frame(AVFilterLink *outlink)
716 ShowCQTContext *s = outlink->src->priv;
717 AVFilterLink *inlink = outlink->src->inputs[0];
720 ret = ff_request_frame(inlink);
721 if (ret == AVERROR_EOF && s->outpicref)
722 filter_frame(inlink, NULL);
726 static const AVFilterPad showcqt_inputs[] = {
729 .type = AVMEDIA_TYPE_AUDIO,
730 .filter_frame = filter_frame,
735 static const AVFilterPad showcqt_outputs[] = {
738 .type = AVMEDIA_TYPE_VIDEO,
739 .config_props = config_output,
740 .request_frame = request_frame,
745 AVFilter ff_avf_showcqt = {
747 .description = NULL_IF_CONFIG_SMALL("Convert input audio to a CQT (Constant Q Transform) spectrum video output."),
749 .query_formats = query_formats,
750 .priv_size = sizeof(ShowCQTContext),
751 .inputs = showcqt_inputs,
752 .outputs = showcqt_outputs,
753 .priv_class = &showcqt_class,