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 */
83 double timeclamp; /* lower timeclamp, time-accurate, higher timeclamp, freq-accurate (at low freq)*/
84 float coeffclamp; /* lower coeffclamp, more precise, higher coeffclamp, faster */
85 int fullhd; /* if true, output video is at full HD resolution, otherwise it will be halved */
86 float gamma; /* lower gamma, more contrast, higher gamma, more range */
87 float gamma2; /* gamma of bargraph */
88 int fps; /* the required fps is so strict, so it's enough to be int, but 24000/1001 etc cannot be encoded */
89 int count; /* fps * count = transform rate */
93 #define OFFSET(x) offsetof(ShowCQTContext, x)
94 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
96 static const AVOption showcqt_options[] = {
97 { "volume", "set volume", OFFSET(volume), AV_OPT_TYPE_STRING, { .str = "16" }, CHAR_MIN, CHAR_MAX, FLAGS },
98 { "tlength", "set transform length", OFFSET(tlength), AV_OPT_TYPE_STRING, { .str = TLENGTH_DEFAULT }, CHAR_MIN, CHAR_MAX, FLAGS },
99 { "timeclamp", "set timeclamp", OFFSET(timeclamp), AV_OPT_TYPE_DOUBLE, { .dbl = 0.17 }, 0.1, 1.0, FLAGS },
100 { "coeffclamp", "set coeffclamp", OFFSET(coeffclamp), AV_OPT_TYPE_FLOAT, { .dbl = 1 }, 0.1, 10, FLAGS },
101 { "gamma", "set gamma", OFFSET(gamma), AV_OPT_TYPE_FLOAT, { .dbl = 3 }, 1, 7, FLAGS },
102 { "gamma2", "set gamma of bargraph", OFFSET(gamma2), AV_OPT_TYPE_FLOAT, { .dbl = 1 }, 1, 7, FLAGS },
103 { "fullhd", "set full HD resolution", OFFSET(fullhd), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, FLAGS },
104 { "fps", "set video fps", OFFSET(fps), AV_OPT_TYPE_INT, { .i64 = 25 }, 10, 100, FLAGS },
105 { "count", "set number of transform per frame", OFFSET(count), AV_OPT_TYPE_INT, { .i64 = 6 }, 1, 30, FLAGS },
106 { "fontfile", "set font file", OFFSET(fontfile), AV_OPT_TYPE_STRING, { .str = NULL }, CHAR_MIN, CHAR_MAX, FLAGS },
107 { "fontcolor", "set font color", OFFSET(fontcolor), AV_OPT_TYPE_STRING, { .str = FONTCOLOR_DEFAULT }, CHAR_MIN, CHAR_MAX, FLAGS },
108 { "text", "draw text", OFFSET(draw_text), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, FLAGS },
112 AVFILTER_DEFINE_CLASS(showcqt);
114 static av_cold void uninit(AVFilterContext *ctx)
118 ShowCQTContext *s = ctx->priv;
119 av_fft_end(s->fft_context);
120 s->fft_context = NULL;
121 for (k = 0; k < VIDEO_WIDTH; k++)
122 av_freep(&s->coeffs[k].values);
123 av_freep(&s->fft_data);
124 av_freep(&s->fft_result);
125 av_freep(&s->spectogram);
126 av_freep(&s->font_alpha);
127 av_frame_free(&s->outpicref);
130 static int query_formats(AVFilterContext *ctx)
132 AVFilterFormats *formats = NULL;
133 AVFilterChannelLayouts *layouts = NULL;
134 AVFilterLink *inlink = ctx->inputs[0];
135 AVFilterLink *outlink = ctx->outputs[0];
136 static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_NONE };
137 static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_RGB24, AV_PIX_FMT_NONE };
138 static const int64_t channel_layouts[] = { AV_CH_LAYOUT_STEREO, AV_CH_LAYOUT_STEREO_DOWNMIX, -1 };
139 static const int samplerates[] = { 44100, 48000, -1 };
141 /* set input audio formats */
142 formats = ff_make_format_list(sample_fmts);
144 return AVERROR(ENOMEM);
145 ff_formats_ref(formats, &inlink->out_formats);
147 layouts = avfilter_make_format64_list(channel_layouts);
149 return AVERROR(ENOMEM);
150 ff_channel_layouts_ref(layouts, &inlink->out_channel_layouts);
152 formats = ff_make_format_list(samplerates);
154 return AVERROR(ENOMEM);
155 ff_formats_ref(formats, &inlink->out_samplerates);
157 /* set output video format */
158 formats = ff_make_format_list(pix_fmts);
160 return AVERROR(ENOMEM);
161 ff_formats_ref(formats, &outlink->in_formats);
166 #if CONFIG_LIBFREETYPE
167 static void load_freetype_font(AVFilterContext *ctx)
169 static const char str[] = "EF G A BC D ";
170 ShowCQTContext *s = ctx->priv;
171 FT_Library lib = NULL;
173 int video_scale = s->fullhd ? 2 : 1;
174 int video_width = (VIDEO_WIDTH/2) * video_scale;
175 int font_height = (FONT_HEIGHT/2) * video_scale;
176 int font_width = 8 * video_scale;
177 int font_repeat = font_width * 12;
178 int linear_hori_advance = font_width * 65536;
179 int non_monospace_warning = 0;
182 s->font_alpha = NULL;
187 if (FT_Init_FreeType(&lib))
190 if (FT_New_Face(lib, s->fontfile, 0, &face))
193 if (FT_Set_Char_Size(face, 16*64, 0, 0, 0))
196 if (FT_Load_Char(face, 'A', FT_LOAD_RENDER))
199 if (FT_Set_Char_Size(face, 16*64 * linear_hori_advance / face->glyph->linearHoriAdvance, 0, 0, 0))
202 s->font_alpha = av_malloc_array(font_height, video_width);
206 memset(s->font_alpha, 0, font_height * video_width);
208 for (x = 0; x < 12; x++) {
209 int sx, sy, rx, bx, by, dx, dy;
214 if (FT_Load_Char(face, str[x], FT_LOAD_RENDER))
217 if (face->glyph->advance.x != font_width*64 && !non_monospace_warning) {
218 av_log(ctx, AV_LOG_WARNING, "Font is not monospace\n");
219 non_monospace_warning = 1;
222 sy = font_height - 4*video_scale - face->glyph->bitmap_top;
223 for (rx = 0; rx < 10; rx++) {
224 sx = rx * font_repeat + x * font_width + face->glyph->bitmap_left;
225 for (by = 0; by < face->glyph->bitmap.rows; by++) {
229 if (dy >= font_height)
232 for (bx = 0; bx < face->glyph->bitmap.width; bx++) {
236 if (dx >= video_width)
238 s->font_alpha[dy*video_width+dx] = face->glyph->bitmap.buffer[by*face->glyph->bitmap.width+bx];
245 FT_Done_FreeType(lib);
249 av_log(ctx, AV_LOG_WARNING, "Error while loading freetype font, using default font instead\n");
251 FT_Done_FreeType(lib);
252 av_freep(&s->font_alpha);
257 static double a_weighting(void *p, double f)
259 double ret = 12200.0*12200.0 * (f*f*f*f);
260 ret /= (f*f + 20.6*20.6) * (f*f + 12200.0*12200.0) *
261 sqrt((f*f + 107.7*107.7) * (f*f + 737.9*737.9));
265 static double b_weighting(void *p, double f)
267 double ret = 12200.0*12200.0 * (f*f*f);
268 ret /= (f*f + 20.6*20.6) * (f*f + 12200.0*12200.0) * sqrt(f*f + 158.5*158.5);
272 static double c_weighting(void *p, double f)
274 double ret = 12200.0*12200.0 * (f*f);
275 ret /= (f*f + 20.6*20.6) * (f*f + 12200.0*12200.0);
279 static double midi(void *p, double f)
281 return log2(f/440.0) * 12.0 + 69.0;
284 static double r_func(void *p, double x)
286 x = av_clipd(x, 0.0, 1.0);
287 return (int)(x*255.0+0.5) << 16;
290 static double g_func(void *p, double x)
292 x = av_clipd(x, 0.0, 1.0);
293 return (int)(x*255.0+0.5) << 8;
296 static double b_func(void *p, double x)
298 x = av_clipd(x, 0.0, 1.0);
299 return (int)(x*255.0+0.5);
302 static int config_output(AVFilterLink *outlink)
304 AVFilterContext *ctx = outlink->src;
305 AVFilterLink *inlink = ctx->inputs[0];
306 ShowCQTContext *s = ctx->priv;
307 AVExpr *tlength_expr = NULL, *volume_expr = NULL, *fontcolor_expr = NULL;
308 uint8_t *fontcolor_value = s->fontcolor_value;
309 static const char * const expr_vars[] = { "timeclamp", "tc", "frequency", "freq", "f", NULL };
310 static const char * const expr_func_names[] = { "a_weighting", "b_weighting", "c_weighting", NULL };
311 static const char * const expr_fontcolor_func_names[] = { "midi", "r", "g", "b", NULL };
312 static double (* const expr_funcs[])(void *, double) = { a_weighting, b_weighting, c_weighting, NULL };
313 static double (* const expr_fontcolor_funcs[])(void *, double) = { midi, r_func, g_func, b_func, NULL };
314 int fft_len, k, x, ret;
316 int rate = inlink->sample_rate;
317 double max_len = rate * (double) s->timeclamp;
318 int video_scale = s->fullhd ? 2 : 1;
319 int video_width = (VIDEO_WIDTH/2) * video_scale;
320 int video_height = (VIDEO_HEIGHT/2) * video_scale;
321 int spectogram_height = (SPECTOGRAM_HEIGHT/2) * video_scale;
323 s->fft_bits = ceil(log2(max_len));
324 fft_len = 1 << s->fft_bits;
326 if (rate % (s->fps * s->count)) {
327 av_log(ctx, AV_LOG_ERROR, "Rate (%u) is not divisible by fps*count (%u*%u)\n", rate, s->fps, s->count);
328 return AVERROR(EINVAL);
331 s->fft_data = av_malloc_array(fft_len, sizeof(*s->fft_data));
332 s->fft_result = av_malloc_array(fft_len + 1, sizeof(*s->fft_result));
333 s->fft_context = av_fft_init(s->fft_bits, 0);
335 if (!s->fft_data || !s->fft_result || !s->fft_context)
336 return AVERROR(ENOMEM);
338 #if CONFIG_LIBFREETYPE
339 load_freetype_font(ctx);
342 av_log(ctx, AV_LOG_WARNING, "Freetype is not available, ignoring fontfile option\n");
343 s->font_alpha = NULL;
346 ret = av_expr_parse(&tlength_expr, s->tlength, expr_vars, NULL, NULL, NULL, NULL, 0, ctx);
350 ret = av_expr_parse(&volume_expr, s->volume, expr_vars, expr_func_names,
351 expr_funcs, NULL, NULL, 0, ctx);
355 ret = av_expr_parse(&fontcolor_expr, s->fontcolor, expr_vars, expr_fontcolor_func_names,
356 expr_fontcolor_funcs, NULL, NULL, 0, ctx);
360 for (k = 0; k < VIDEO_WIDTH; k++) {
361 double freq = BASE_FREQ * exp2(k * (1.0/192.0));
362 double flen, center, tlength, volume;
364 double expr_vars_val[] = { s->timeclamp, s->timeclamp, freq, freq, freq, 0 };
366 tlength = av_expr_eval(tlength_expr, expr_vars_val, NULL);
367 if (isnan(tlength)) {
368 av_log(ctx, AV_LOG_WARNING, "at freq %g: tlength is nan, setting it to %g\n", freq, s->timeclamp);
369 tlength = s->timeclamp;
370 } else if (tlength < TLENGTH_MIN) {
371 av_log(ctx, AV_LOG_WARNING, "at freq %g: tlength is %g, setting it to %g\n", freq, tlength, TLENGTH_MIN);
372 tlength = TLENGTH_MIN;
373 } else if (tlength > s->timeclamp) {
374 av_log(ctx, AV_LOG_WARNING, "at freq %g: tlength is %g, setting it to %g\n", freq, tlength, s->timeclamp);
375 tlength = s->timeclamp;
378 volume = FFABS(av_expr_eval(volume_expr, expr_vars_val, NULL));
380 av_log(ctx, AV_LOG_WARNING, "at freq %g: volume is nan, setting it to 0\n", freq);
382 } else if (volume < VOLUME_MIN) {
384 } else if (volume > VOLUME_MAX) {
385 av_log(ctx, AV_LOG_WARNING, "at freq %g: volume is %g, setting it to %g\n", freq, volume, VOLUME_MAX);
389 if (s->fullhd || !(k & 1)) {
390 int fontcolor = av_expr_eval(fontcolor_expr, expr_vars_val, NULL);
391 fontcolor_value[0] = (fontcolor >> 16) & 0xFF;
392 fontcolor_value[1] = (fontcolor >> 8) & 0xFF;
393 fontcolor_value[2] = fontcolor & 0xFF;
394 fontcolor_value += 3;
397 /* direct frequency domain windowing */
398 flen = 8.0 * fft_len / (tlength * rate);
399 center = freq * fft_len / rate;
400 start = FFMAX(0, ceil(center - 0.5 * flen));
401 end = FFMIN(fft_len, floor(center + 0.5 * flen));
402 s->coeffs[k].len = end - start + 1;
403 s->coeffs[k].start = start;
404 num_coeffs += s->coeffs[k].len;
405 s->coeffs[k].values = av_malloc_array(s->coeffs[k].len, sizeof(*s->coeffs[k].values));
406 if (!s->coeffs[k].values) {
407 ret = AVERROR(ENOMEM);
410 for (x = start; x <= end; x++) {
411 int sign = (x & 1) ? (-1) : 1;
412 double u = 2.0 * M_PI * (x - center) * (1.0/flen);
414 double w = 0.355768 + 0.487396 * cos(u) + 0.144232 * cos(2*u) + 0.012604 * cos(3*u);
415 s->coeffs[k].values[x-start] = sign * volume * (1.0/fft_len) * w;
418 av_expr_free(fontcolor_expr);
419 av_expr_free(volume_expr);
420 av_expr_free(tlength_expr);
421 av_log(ctx, AV_LOG_INFO, "fft_len=%u, num_coeffs=%u\n", fft_len, num_coeffs);
423 outlink->w = video_width;
424 outlink->h = video_height;
426 s->req_fullfilled = 0;
427 s->spectogram_index = 0;
429 s->spectogram_count = 0;
430 s->remaining_fill = fft_len >> 1;
431 memset(s->fft_data, 0, fft_len * sizeof(*s->fft_data));
433 s->outpicref = ff_get_video_buffer(outlink, outlink->w, outlink->h);
435 return AVERROR(ENOMEM);
437 s->spectogram = av_calloc(spectogram_height, s->outpicref->linesize[0]);
439 return AVERROR(ENOMEM);
441 outlink->sample_aspect_ratio = av_make_q(1, 1);
442 outlink->time_base = av_make_q(1, s->fps);
443 outlink->frame_rate = av_make_q(s->fps, 1);
447 av_expr_free(fontcolor_expr);
448 av_expr_free(volume_expr);
449 av_expr_free(tlength_expr);
453 static int plot_cqt(AVFilterLink *inlink)
455 AVFilterContext *ctx = inlink->dst;
456 ShowCQTContext *s = ctx->priv;
457 AVFilterLink *outlink = ctx->outputs[0];
458 int fft_len = 1 << s->fft_bits;
459 FFTSample result[VIDEO_WIDTH][4];
461 int linesize = s->outpicref->linesize[0];
462 int video_scale = s->fullhd ? 2 : 1;
463 int video_width = (VIDEO_WIDTH/2) * video_scale;
464 int spectogram_height = (SPECTOGRAM_HEIGHT/2) * video_scale;
465 int spectogram_start = (SPECTOGRAM_START/2) * video_scale;
466 int font_height = (FONT_HEIGHT/2) * video_scale;
468 /* real part contains left samples, imaginary part contains right samples */
469 memcpy(s->fft_result, s->fft_data, fft_len * sizeof(*s->fft_data));
470 av_fft_permute(s->fft_context, s->fft_result);
471 av_fft_calc(s->fft_context, s->fft_result);
472 s->fft_result[fft_len] = s->fft_result[0];
474 /* calculating cqt */
475 for (x = 0; x < VIDEO_WIDTH; x++) {
477 FFTComplex v = {0,0};
478 FFTComplex w = {0,0};
481 for (u = 0; u < s->coeffs[x].len; u++) {
482 FFTSample value = s->coeffs[x].values[u];
483 int index = s->coeffs[x].start + u;
484 v.re += value * s->fft_result[index].re;
485 v.im += value * s->fft_result[index].im;
486 w.re += value * s->fft_result[fft_len - index].re;
487 w.im += value * s->fft_result[fft_len - index].im;
490 /* separate left and right, (and multiply by 2.0) */
495 /* result is power, not amplitude */
496 result[x][0] = l.re * l.re + l.im * l.im;
497 result[x][2] = r.re * r.re + r.im * r.im;
498 result[x][1] = 0.5f * (result[x][0] + result[x][2]);
500 if (s->gamma2 == 1.0f)
501 result[x][3] = result[x][1];
502 else if (s->gamma2 == 2.0f)
503 result[x][3] = sqrtf(result[x][1]);
504 else if (s->gamma2 == 3.0f)
505 result[x][3] = cbrtf(result[x][1]);
506 else if (s->gamma2 == 4.0f)
507 result[x][3] = sqrtf(sqrtf(result[x][1]));
509 result[x][3] = expf(logf(result[x][1]) * (1.0f / s->gamma2));
511 result[x][0] = FFMIN(1.0f, result[x][0]);
512 result[x][1] = FFMIN(1.0f, result[x][1]);
513 result[x][2] = FFMIN(1.0f, result[x][2]);
514 if (s->gamma == 1.0f) {
515 result[x][0] = 255.0f * result[x][0];
516 result[x][1] = 255.0f * result[x][1];
517 result[x][2] = 255.0f * result[x][2];
518 } else if (s->gamma == 2.0f) {
519 result[x][0] = 255.0f * sqrtf(result[x][0]);
520 result[x][1] = 255.0f * sqrtf(result[x][1]);
521 result[x][2] = 255.0f * sqrtf(result[x][2]);
522 } else if (s->gamma == 3.0f) {
523 result[x][0] = 255.0f * cbrtf(result[x][0]);
524 result[x][1] = 255.0f * cbrtf(result[x][1]);
525 result[x][2] = 255.0f * cbrtf(result[x][2]);
526 } else if (s->gamma == 4.0f) {
527 result[x][0] = 255.0f * sqrtf(sqrtf(result[x][0]));
528 result[x][1] = 255.0f * sqrtf(sqrtf(result[x][1]));
529 result[x][2] = 255.0f * sqrtf(sqrtf(result[x][2]));
531 result[x][0] = 255.0f * expf(logf(result[x][0]) * (1.0f / s->gamma));
532 result[x][1] = 255.0f * expf(logf(result[x][1]) * (1.0f / s->gamma));
533 result[x][2] = 255.0f * expf(logf(result[x][2]) * (1.0f / s->gamma));
538 for (x = 0; x < video_width; x++) {
539 result[x][0] = 0.5f * (result[2*x][0] + result[2*x+1][0]);
540 result[x][1] = 0.5f * (result[2*x][1] + result[2*x+1][1]);
541 result[x][2] = 0.5f * (result[2*x][2] + result[2*x+1][2]);
542 result[x][3] = 0.5f * (result[2*x][3] + result[2*x+1][3]);
546 for (x = 0; x < video_width; x++) {
547 s->spectogram[s->spectogram_index*linesize + 3*x] = result[x][0] + 0.5f;
548 s->spectogram[s->spectogram_index*linesize + 3*x + 1] = result[x][1] + 0.5f;
549 s->spectogram[s->spectogram_index*linesize + 3*x + 2] = result[x][2] + 0.5f;
553 if (!s->spectogram_count) {
554 uint8_t *data = (uint8_t*) s->outpicref->data[0];
555 float rcp_result[VIDEO_WIDTH];
556 int total_length = linesize * spectogram_height;
557 int back_length = linesize * s->spectogram_index;
559 for (x = 0; x < video_width; x++)
560 rcp_result[x] = 1.0f / (result[x][3]+0.0001f);
563 for (y = 0; y < spectogram_height; y++) {
564 float height = (spectogram_height - y) * (1.0f/spectogram_height);
565 uint8_t *lineptr = data + y * linesize;
566 for (x = 0; x < video_width; x++) {
568 if (result[x][3] <= height) {
573 mul = (result[x][3] - height) * rcp_result[x];
574 *lineptr++ = mul * result[x][0] + 0.5f;
575 *lineptr++ = mul * result[x][1] + 0.5f;
576 *lineptr++ = mul * result[x][2] + 0.5f;
582 if (s->font_alpha && s->draw_text) {
583 for (y = 0; y < font_height; y++) {
584 uint8_t *lineptr = data + (spectogram_height + y) * linesize;
585 uint8_t *spectogram_src = s->spectogram + s->spectogram_index * linesize;
586 uint8_t *fontcolor_value = s->fontcolor_value;
587 for (x = 0; x < video_width; x++) {
588 uint8_t alpha = s->font_alpha[y*video_width+x];
589 lineptr[3*x] = (spectogram_src[3*x] * (255-alpha) + fontcolor_value[0] * alpha + 255) >> 8;
590 lineptr[3*x+1] = (spectogram_src[3*x+1] * (255-alpha) + fontcolor_value[1] * alpha + 255) >> 8;
591 lineptr[3*x+2] = (spectogram_src[3*x+2] * (255-alpha) + fontcolor_value[2] * alpha + 255) >> 8;
592 fontcolor_value += 3;
595 } else if (s->draw_text) {
596 for (y = 0; y < font_height; y++) {
597 uint8_t *lineptr = data + (spectogram_height + y) * linesize;
598 memcpy(lineptr, s->spectogram + s->spectogram_index * linesize, video_width*3);
600 for (x = 0; x < video_width; x += video_width/10) {
602 static const char str[] = "EF G A BC D ";
603 uint8_t *startptr = data + spectogram_height * linesize + x * 3;
604 for (u = 0; str[u]; u++) {
606 for (v = 0; v < 16; v++) {
607 uint8_t *p = startptr + v * linesize * video_scale + 8 * 3 * u * video_scale;
608 int ux = x + 8 * u * video_scale;
610 for (mask = 0x80; mask; mask >>= 1) {
611 if (mask & avpriv_vga16_font[str[u] * 16 + v]) {
612 p[0] = s->fontcolor_value[3*ux];
613 p[1] = s->fontcolor_value[3*ux+1];
614 p[2] = s->fontcolor_value[3*ux+2];
615 if (video_scale == 2) {
617 p[linesize+1] = p[1];
618 p[linesize+2] = p[2];
619 p[3] = p[linesize+3] = s->fontcolor_value[3*ux+3];
620 p[4] = p[linesize+4] = s->fontcolor_value[3*ux+4];
621 p[5] = p[linesize+5] = s->fontcolor_value[3*ux+5];
624 p += 3 * video_scale;
631 for (y = 0; y < font_height; y++) {
632 uint8_t *lineptr = data + (spectogram_height + y) * linesize;
633 uint8_t *spectogram_src = s->spectogram + s->spectogram_index * linesize;
634 for (x = 0; x < video_width; x++) {
635 lineptr[3*x] = spectogram_src[3*x];
636 lineptr[3*x+1] = spectogram_src[3*x+1];
637 lineptr[3*x+2] = spectogram_src[3*x+2];
642 /* drawing spectogram/sonogram */
643 data += spectogram_start * linesize;
644 memcpy(data, s->spectogram + s->spectogram_index*linesize, total_length - back_length);
646 data += total_length - back_length;
648 memcpy(data, s->spectogram, back_length);
650 s->outpicref->pts = s->frame_count;
651 ret = ff_filter_frame(outlink, av_frame_clone(s->outpicref));
652 s->req_fullfilled = 1;
655 s->spectogram_count = (s->spectogram_count + 1) % s->count;
656 s->spectogram_index = (s->spectogram_index + spectogram_height - 1) % spectogram_height;
660 static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
662 AVFilterContext *ctx = inlink->dst;
663 ShowCQTContext *s = ctx->priv;
664 int step = inlink->sample_rate / (s->fps * s->count);
665 int fft_len = 1 << s->fft_bits;
670 while (s->remaining_fill < (fft_len >> 1)) {
672 memset(&s->fft_data[fft_len - s->remaining_fill], 0, sizeof(*s->fft_data) * s->remaining_fill);
673 ret = plot_cqt(inlink);
676 for (x = 0; x < (fft_len-step); x++)
677 s->fft_data[x] = s->fft_data[x+step];
678 s->remaining_fill += step;
683 remaining = insamples->nb_samples;
684 audio_data = (float*) insamples->data[0];
687 if (remaining >= s->remaining_fill) {
688 int i = insamples->nb_samples - remaining;
689 int j = fft_len - s->remaining_fill;
691 for (m = 0; m < s->remaining_fill; m++) {
692 s->fft_data[j+m].re = audio_data[2*(i+m)];
693 s->fft_data[j+m].im = audio_data[2*(i+m)+1];
695 ret = plot_cqt(inlink);
697 av_frame_free(&insamples);
700 remaining -= s->remaining_fill;
701 for (m = 0; m < fft_len-step; m++)
702 s->fft_data[m] = s->fft_data[m+step];
703 s->remaining_fill = step;
705 int i = insamples->nb_samples - remaining;
706 int j = fft_len - s->remaining_fill;
708 for (m = 0; m < remaining; m++) {
709 s->fft_data[m+j].re = audio_data[2*(i+m)];
710 s->fft_data[m+j].im = audio_data[2*(i+m)+1];
712 s->remaining_fill -= remaining;
716 av_frame_free(&insamples);
720 static int request_frame(AVFilterLink *outlink)
722 ShowCQTContext *s = outlink->src->priv;
723 AVFilterLink *inlink = outlink->src->inputs[0];
726 s->req_fullfilled = 0;
728 ret = ff_request_frame(inlink);
729 } while (!s->req_fullfilled && ret >= 0);
731 if (ret == AVERROR_EOF && s->outpicref)
732 filter_frame(inlink, NULL);
736 static const AVFilterPad showcqt_inputs[] = {
739 .type = AVMEDIA_TYPE_AUDIO,
740 .filter_frame = filter_frame,
745 static const AVFilterPad showcqt_outputs[] = {
748 .type = AVMEDIA_TYPE_VIDEO,
749 .config_props = config_output,
750 .request_frame = request_frame,
755 AVFilter ff_avf_showcqt = {
757 .description = NULL_IF_CONFIG_SMALL("Convert input audio to a CQT (Constant Q Transform) spectrum video output."),
759 .query_formats = query_formats,
760 .priv_size = sizeof(ShowCQTContext),
761 .inputs = showcqt_inputs,
762 .outputs = showcqt_outputs,
763 .priv_class = &showcqt_class,