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FFmpeg/libavfilter/avf_showcqt.c

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  1. /*

  2.  * Copyright (c) 2014 Muhammad Faiz <mfcc64@gmail.com>

  3.  *

  4.  * This file is part of FFmpeg.

  5.  *

  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.

  10.  *

  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.

  15.  *

  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

  19.  */

  20. 

  21. #include "config.h"

  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"

  30. #include "avfilter.h"

  31. #include "internal.h"

  32. 

  33. #include <math.h>

  34. #include <stdlib.h>

  35. 

  36. #if CONFIG_LIBFREETYPE

  37. #include <ft2build.h>

  38. #include FT_FREETYPE_H

  39. #endif

  40. 

  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 */

  45. 

  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))"

  60. 

  61. typedef struct {

  62.     FFTSample value;

  63.     int index;

  64. } SparseCoeff;

  65. 

  66. typedef struct {

  67.     const AVClass *class;

  68.     AVFrame *outpicref;

  69.     FFTContext *fft_context;

  70.     FFTComplex *fft_data;

  71.     FFTComplex *fft_result_left;

  72.     FFTComplex *fft_result_right;

  73.     uint8_t *spectogram;

  74.     SparseCoeff *coeff_sort;

  75.     SparseCoeff *coeffs[VIDEO_WIDTH];

  76.     uint8_t *font_alpha;

  77.     char *fontfile;     /* using freetype */

  78.     int coeffs_len[VIDEO_WIDTH];

  79.     uint8_t fontcolor_value[VIDEO_WIDTH*3];  /* result of fontcolor option */

  80.     int64_t frame_count;

  81.     int spectogram_count;

  82.     int spectogram_index;

  83.     int fft_bits;

  84.     int req_fullfilled;

  85.     int remaining_fill;

  86.     char *tlength;

  87.     char *volume;

  88.     char *fontcolor;

  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 */

  96. } ShowCQTContext;

  97. 

  98. #define OFFSET(x) offsetof(ShowCQTContext, x)

  99. #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

  100. 

  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_INT, { .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 },

  113.     { NULL }

  114. };

  115. 

  116. AVFILTER_DEFINE_CLASS(showcqt);

  117. 

  118. static av_cold void uninit(AVFilterContext *ctx)

  119. {

  120.     int k;

  121. 

  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);

  134. }

  135. 

  136. static int query_formats(AVFilterContext *ctx)

  137. {

  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 };

  146. 

  147.     /* set input audio formats */

  148.     formats = ff_make_format_list(sample_fmts);

  149.     if (!formats)

  150.         return AVERROR(ENOMEM);

  151.     ff_formats_ref(formats, &inlink->out_formats);

  152. 

  153.     layouts = avfilter_make_format64_list(channel_layouts);

  154.     if (!layouts)

  155.         return AVERROR(ENOMEM);

  156.     ff_channel_layouts_ref(layouts, &inlink->out_channel_layouts);

  157. 

  158.     formats = ff_make_format_list(samplerates);

  159.     if (!formats)

  160.         return AVERROR(ENOMEM);

  161.     ff_formats_ref(formats, &inlink->out_samplerates);

  162. 

  163.     /* set output video format */

  164.     formats = ff_make_format_list(pix_fmts);

  165.     if (!formats)

  166.         return AVERROR(ENOMEM);

  167.     ff_formats_ref(formats, &outlink->in_formats);

  168. 

  169.     return 0;

  170. }

  171. 

  172. #if CONFIG_LIBFREETYPE

  173. static void load_freetype_font(AVFilterContext *ctx)

  174. {

  175.     static const char str[] = "EF G A BC D ";

  176.     ShowCQTContext *s = ctx->priv;

  177.     FT_Library lib = NULL;

  178.     FT_Face face = 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;

  186.     int x;

  187. 

  188.     s->font_alpha = NULL;

  189. 

  190.     if (!s->fontfile)

  191.         return;

  192. 

  193.     if (FT_Init_FreeType(&lib))

  194.         goto fail;

  195. 

  196.     if (FT_New_Face(lib, s->fontfile, 0, &face))

  197.         goto fail;

  198. 

  199.     if (FT_Set_Char_Size(face, 16*64, 0, 0, 0))

  200.         goto fail;

  201. 

  202.     if (FT_Load_Char(face, 'A', FT_LOAD_RENDER))

  203.         goto fail;

  204. 

  205.     if (FT_Set_Char_Size(face, 16*64 * linear_hori_advance / face->glyph->linearHoriAdvance, 0, 0, 0))

  206.         goto fail;

  207. 

  208.     s->font_alpha = av_malloc_array(font_height, video_width);

  209.     if (!s->font_alpha)

  210.         goto fail;

  211. 

  212.     memset(s->font_alpha, 0, font_height * video_width);

  213. 

  214.     for (x = 0; x < 12; x++) {

  215.         int sx, sy, rx, bx, by, dx, dy;

  216. 

  217.         if (str[x] == ' ')

  218.             continue;

  219. 

  220.         if (FT_Load_Char(face, str[x], FT_LOAD_RENDER))

  221.             goto fail;

  222. 

  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;

  226.         }

  227. 

  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++) {

  232.                 dy = by + sy;

  233.                 if (dy < 0)

  234.                     continue;

  235.                 if (dy >= font_height)

  236.                     break;

  237. 

  238.                 for (bx = 0; bx < face->glyph->bitmap.width; bx++) {

  239.                     dx = bx + sx;

  240.                     if (dx < 0)

  241.                         continue;

  242.                     if (dx >= video_width)

  243.                         break;

  244.                     s->font_alpha[dy*video_width+dx] = face->glyph->bitmap.buffer[by*face->glyph->bitmap.width+bx];

  245.                 }

  246.             }

  247.         }

  248.     }

  249. 

  250.     FT_Done_Face(face);

  251.     FT_Done_FreeType(lib);

  252.     return;

  253. 

  254.     fail:

  255.     av_log(ctx, AV_LOG_WARNING, "Error while loading freetype font, using default font instead\n");

  256.     FT_Done_Face(face);

  257.     FT_Done_FreeType(lib);

  258.     av_freep(&s->font_alpha);

  259.     return;

  260. }

  261. #endif

  262. 

  263. static double a_weighting(void *p, double f)

  264. {

  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));

  268.     return ret;

  269. }

  270. 

  271. static double b_weighting(void *p, double f)

  272. {

  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);

  275.     return ret;

  276. }

  277. 

  278. static double c_weighting(void *p, double f)

  279. {

  280.     double ret = 12200.0*12200.0 * (f*f);

  281.     ret /= (f*f + 20.6*20.6) * (f*f + 12200.0*12200.0);

  282.     return ret;

  283. }

  284. 

  285. static double midi(void *p, double f)

  286. {

  287.     return log2(f/440.0) * 12.0 + 69.0;

  288. }

  289. 

  290. static double r_func(void *p, double x)

  291. {

  292.     x = av_clipd(x, 0.0, 1.0);

  293.     return (int)(x*255.0+0.5) << 16;

  294. }

  295. 

  296. static double g_func(void *p, double x)

  297. {

  298.     x = av_clipd(x, 0.0, 1.0);

  299.     return (int)(x*255.0+0.5) << 8;

  300. }

  301. 

  302. static double b_func(void *p, double x)

  303. {

  304.     x = av_clipd(x, 0.0, 1.0);

  305.     return (int)(x*255.0+0.5);

  306. }

  307. 

  308. static inline int qsort_sparsecoeff(const SparseCoeff *a, const SparseCoeff *b)

  309. {

  310.     if (fabsf(a->value) >= fabsf(b->value))

  311.         return 1;

  312.     else

  313.         return -1;

  314. }

  315. 

  316. static int config_output(AVFilterLink *outlink)

  317. {

  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;

  329.     int num_coeffs = 0;

  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;

  337. 

  338.     s->fft_bits = ceil(log2(max_len));

  339.     fft_len = 1 << s->fft_bits;

  340. 

  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);

  344.     }

  345. 

  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);

  351. 

  352.     if (!s->fft_data || !s->coeff_sort || !s->fft_result_left || !s->fft_result_right || !s->fft_context)

  353.         return AVERROR(ENOMEM);

  354. 

  355. #if CONFIG_LIBFREETYPE

  356.     load_freetype_font(ctx);

  357. #else

  358.     if (s->fontfile)

  359.         av_log(ctx, AV_LOG_WARNING, "Freetype is not available, ignoring fontfile option\n");

  360.     s->font_alpha = NULL;

  361. #endif

  362. 

  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);

  366.     if (ret < 0)

  367.         goto eval_error;

  368. 

  369.     ret = av_expr_parse(&volume_expr, s->volume, expr_vars, expr_func_names,

  370.                         expr_funcs, NULL, NULL, 0, ctx);

  371.     if (ret < 0)

  372.         goto eval_error;

  373. 

  374.     ret = av_expr_parse(&fontcolor_expr, s->fontcolor, expr_vars, expr_fontcolor_func_names,

  375.                         expr_fontcolor_funcs, NULL, NULL, 0, ctx);

  376.     if (ret < 0)

  377.         goto eval_error;

  378. 

  379.     for (k = 0; k < VIDEO_WIDTH; k++) {

  380.         int hlen = fft_len >> 1;

  381.         float total = 0;

  382.         float partial = 0;

  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;

  396. 

  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;

  407.         }

  408. 

  409.         volume = FFABS(av_expr_eval(volume_expr, expr_vars_val, NULL));

  410.         if (isnan(volume)) {

  411.             av_log(ctx, AV_LOG_WARNING, "at freq %g: volume is nan, setting it to 0\n", freq);

  412.             volume = VOLUME_MIN;

  413.         } else if (volume < VOLUME_MIN) {

  414.             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);

  417.             volume = VOLUME_MAX;

  418.         }

  419. 

  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;

  426.         }

  427. 

  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;

  441. 

  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;

  450. 

  451.             cv_tmp = cv * cv_step - sv * sv_step;

  452.             sv = sv * cv_step + cv * sv_step;

  453.             cv = cv_tmp;

  454.             cw_tmp = cw * cw_step - sw * sw_step;

  455.             sw = sw * cw_step + cw * sw_step;

  456.             cw = cw_tmp;

  457.         }

  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;

  463.         }

  464.         av_fft_permute(s->fft_context, s->fft_data);

  465.         av_fft_calc(s->fft_context, s->fft_data);

  466. 

  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;

  470.         }

  471. 

  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);

  475. 

  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]));

  482.                 if (!s->coeffs[k]) {

  483.                     ret = AVERROR(ENOMEM);

  484.                     goto eval_error;

  485.                 }

  486.                 for (y = 0; y < s->coeffs_len[k]; y++)

  487.                     s->coeffs[k][y] = s->coeff_sort[x+y];

  488.                 break;

  489.             }

  490.         }

  491.     }

  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);

  497. 

  498.     outlink->w = video_width;

  499.     outlink->h = video_height;

  500. 

  501.     s->req_fullfilled = 0;

  502.     s->spectogram_index = 0;

  503.     s->frame_count = 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));

  507. 

  508.     s->outpicref = ff_get_video_buffer(outlink, outlink->w, outlink->h);

  509.     if (!s->outpicref)

  510.         return AVERROR(ENOMEM);

  511. 

  512.     s->spectogram = av_calloc(spectogram_height, s->outpicref->linesize[0]);

  513.     if (!s->spectogram)

  514.         return AVERROR(ENOMEM);

  515. 

  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);

  519.     return 0;

  520. 

  521. eval_error:

  522.     av_expr_free(fontcolor_expr);

  523.     av_expr_free(volume_expr);

  524.     av_expr_free(tlength_expr);

  525.     return ret;

  526. }

  527. 

  528. static int plot_cqt(AVFilterLink *inlink)

  529. {

  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];

  535.     int x, y, ret = 0;

  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;

  542. 

  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);

  547. 

  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;

  555. 

  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;

  560. 

  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;

  565.     }

  566. 

  567.     /* calculating cqt */

  568.     for (x = 0; x < VIDEO_WIDTH; x++) {

  569.         int u;

  570.         FFTComplex l = {0,0};

  571.         FFTComplex r = {0,0};

  572. 

  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;

  580.         }

  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]);

  585. 

  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]));

  594.         else

  595.             result[x][3] = expf(logf(result[x][1]) * (1.0f / s->gamma2));

  596. 

  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]));

  616.         } else {

  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));

  620.         }

  621.     }

  622. 

  623.     if (!s->fullhd) {

  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]);

  629.         }

  630.     }

  631. 

  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;

  636.     }

  637. 

  638.     /* drawing */

  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;

  644. 

  645.         for (x = 0; x < video_width; x++)

  646.             rcp_result[x] = 1.0f / (result[x][3]+0.0001f);

  647. 

  648.         /* drawing bar */

  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++) {

  653.                 float mul;

  654.                 if (result[x][3] <= height) {

  655.                     *lineptr++ = 0;

  656.                     *lineptr++ = 0;

  657.                     *lineptr++ = 0;

  658.                 } else {

  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;

  663.                 }

  664.             }

  665.         }

  666. 

  667.         /* drawing font */

  668.         if (s->font_alpha) {

  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;

  679.                 }

  680.             }

  681.         } else {

  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);

  685.             }

  686.             for (x = 0; x < video_width; x += video_width/10) {

  687.                 int u;

  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++) {

  691.                     int v;

  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;

  695.                         int mask;

  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) {

  702.                                     p[linesize] = p[0];

  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];

  708.                                 }

  709.                             }

  710.                             p  += 3 * video_scale;

  711.                             ux += video_scale;

  712.                         }

  713.                     }

  714.                 }

  715.             }

  716.         }

  717. 

  718.         /* drawing spectogram/sonogram */

  719.         data += spectogram_start * linesize;

  720.         memcpy(data, s->spectogram + s->spectogram_index*linesize, total_length - back_length);

  721. 

  722.         data += total_length - back_length;

  723.         if (back_length)

  724.             memcpy(data, s->spectogram, back_length);

  725. 

  726.         s->outpicref->pts = s->frame_count;

  727.         ret = ff_filter_frame(outlink, av_frame_clone(s->outpicref));

  728.         s->req_fullfilled = 1;

  729.         s->frame_count++;

  730.     }

  731.     s->spectogram_count = (s->spectogram_count + 1) % s->count;

  732.     s->spectogram_index = (s->spectogram_index + spectogram_height - 1) % spectogram_height;

  733.     return ret;

  734. }

  735. 

  736. static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)

  737. {

  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;

  742.     int remaining;

  743.     float *audio_data;

  744. 

  745.     if (!insamples) {

  746.         while (s->remaining_fill < (fft_len >> 1)) {

  747.             int ret, x;

  748.             memset(&s->fft_data[fft_len - s->remaining_fill], 0, sizeof(*s->fft_data) * s->remaining_fill);

  749.             ret = plot_cqt(inlink);

  750.             if (ret < 0)

  751.                 return ret;

  752.             for (x = 0; x < (fft_len-step); x++)

  753.                 s->fft_data[x] = s->fft_data[x+step];

  754.             s->remaining_fill += step;

  755.         }

  756.         return AVERROR_EOF;

  757.     }

  758. 

  759.     remaining = insamples->nb_samples;

  760.     audio_data = (float*) insamples->data[0];

  761. 

  762.     while (remaining) {

  763.         if (remaining >= s->remaining_fill) {

  764.             int i = insamples->nb_samples - remaining;

  765.             int j = fft_len - s->remaining_fill;

  766.             int m, ret;

  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];

  770.             }

  771.             ret = plot_cqt(inlink);

  772.             if (ret < 0) {

  773.                 av_frame_free(&insamples);

  774.                 return ret;

  775.             }

  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;

  780.         } else {

  781.             int i = insamples->nb_samples - remaining;

  782.             int j = fft_len - s->remaining_fill;

  783.             int m;

  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];

  787.             }

  788.             s->remaining_fill -= remaining;

  789.             remaining = 0;

  790.         }

  791.     }

  792.     av_frame_free(&insamples);

  793.     return 0;

  794. }

  795. 

  796. static int request_frame(AVFilterLink *outlink)

  797. {

  798.     ShowCQTContext *s = outlink->src->priv;

  799.     AVFilterLink *inlink = outlink->src->inputs[0];

  800.     int ret;

  801. 

  802.     s->req_fullfilled = 0;

  803.     do {

  804.         ret = ff_request_frame(inlink);

  805.     } while (!s->req_fullfilled && ret >= 0);

  806. 

  807.     if (ret == AVERROR_EOF && s->outpicref)

  808.         filter_frame(inlink, NULL);

  809.     return ret;

  810. }

  811. 

  812. static const AVFilterPad showcqt_inputs[] = {

  813.     {

  814.         .name         = "default",

  815.         .type         = AVMEDIA_TYPE_AUDIO,

  816.         .filter_frame = filter_frame,

  817.     },

  818.     { NULL }

  819. };

  820. 

  821. static const AVFilterPad showcqt_outputs[] = {

  822.     {

  823.         .name          = "default",

  824.         .type          = AVMEDIA_TYPE_VIDEO,

  825.         .config_props  = config_output,

  826.         .request_frame = request_frame,

  827.     },

  828.     { NULL }

  829. };

  830. 

  831. AVFilter ff_avf_showcqt = {

  832.     .name          = "showcqt",

  833.     .description   = NULL_IF_CONFIG_SMALL("Convert input audio to a CQT (Constant Q Transform) spectrum video output."),

  834.     .uninit        = uninit,

  835.     .query_formats = query_formats,

  836.     .priv_size     = sizeof(ShowCQTContext),

  837.     .inputs        = showcqt_inputs,

  838.     .outputs       = showcqt_outputs,

  839.     .priv_class    = &showcqt_class,

  840. };