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FFmpeg/libavfilter/avf_showspectrum.c

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  1. /*

  2.  * Copyright (c) 2012-2013 Clément Bœsch

  3.  * Copyright (c) 2013 Rudolf Polzer <divverent@xonotic.org>

  4.  * Copyright (c) 2015 Paul B Mahol

  5.  *

  6.  * This file is part of FFmpeg.

  7.  *

  8.  * FFmpeg is free software; you can redistribute it and/or

  9.  * modify it under the terms of the GNU Lesser General Public

  10.  * License as published by the Free Software Foundation; either

  11.  * version 2.1 of the License, or (at your option) any later version.

  12.  *

  13.  * FFmpeg is distributed in the hope that it will be useful,

  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  16.  * Lesser General Public License for more details.

  17.  *

  18.  * You should have received a copy of the GNU Lesser General Public

  19.  * License along with FFmpeg; if not, write to the Free Software

  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  21.  */

  22. 

  23. /**

  24.  * @file

  25.  * audio to spectrum (video) transmedia filter, based on ffplay rdft showmode

  26.  * (by Michael Niedermayer) and lavfi/avf_showwaves (by Stefano Sabatini).

  27.  */

  28. 

  29. #include <math.h>

  30. 

  31. #include "libavcodec/avfft.h"

  32. #include "libavutil/audio_fifo.h"

  33. #include "libavutil/avassert.h"

  34. #include "libavutil/avstring.h"

  35. #include "libavutil/channel_layout.h"

  36. #include "libavutil/opt.h"

  37. #include "libavutil/parseutils.h"

  38. #include "libavutil/xga_font_data.h"

  39. #include "audio.h"

  40. #include "video.h"

  41. #include "avfilter.h"

  42. #include "filters.h"

  43. #include "internal.h"

  44. #include "window_func.h"

  45. 

  46. enum DisplayMode  { COMBINED, SEPARATE, NB_MODES };

  47. enum DataMode     { D_MAGNITUDE, D_PHASE, NB_DMODES };

  48. enum FrequencyScale { F_LINEAR, F_LOG, NB_FSCALES };

  49. enum DisplayScale { LINEAR, SQRT, CBRT, LOG, FOURTHRT, FIFTHRT, NB_SCALES };

  50. enum ColorMode    { CHANNEL, INTENSITY, RAINBOW, MORELAND, NEBULAE, FIRE, FIERY, FRUIT, COOL, MAGMA, GREEN, VIRIDIS, PLASMA, CIVIDIS, TERRAIN, NB_CLMODES };

  51. enum SlideMode    { REPLACE, SCROLL, FULLFRAME, RSCROLL, NB_SLIDES };

  52. enum Orientation  { VERTICAL, HORIZONTAL, NB_ORIENTATIONS };

  53. 

  54. typedef struct ShowSpectrumContext {

  55.     const AVClass *class;

  56.     int w, h;

  57.     char *rate_str;

  58.     AVRational auto_frame_rate;

  59.     AVRational frame_rate;

  60.     AVFrame *outpicref;

  61.     int nb_display_channels;

  62.     int orientation;

  63.     int channel_width;

  64.     int channel_height;

  65.     int sliding;                ///< 1 if sliding mode, 0 otherwise

  66.     int mode;                   ///< channel display mode

  67.     int color_mode;             ///< display color scheme

  68.     int scale;

  69.     int fscale;

  70.     float saturation;           ///< color saturation multiplier

  71.     float rotation;             ///< color rotation

  72.     int start, stop;            ///< zoom mode

  73.     int data;

  74.     int xpos;                   ///< x position (current column)

  75.     FFTContext **fft;           ///< Fast Fourier Transform context

  76.     FFTContext **ifft;          ///< Inverse Fast Fourier Transform context

  77.     int fft_bits;               ///< number of bits (FFT window size = 1<<fft_bits)

  78.     FFTComplex **fft_data;      ///< bins holder for each (displayed) channels

  79.     FFTComplex **fft_scratch;   ///< scratch buffers

  80.     float *window_func_lut;     ///< Window function LUT

  81.     float **magnitudes;

  82.     float **phases;

  83.     int win_func;

  84.     int win_size;

  85.     int buf_size;

  86.     double win_scale;

  87.     float overlap;

  88.     float gain;

  89.     int consumed;

  90.     int hop_size;

  91.     float *combine_buffer;      ///< color combining buffer (3 * h items)

  92.     float **color_buffer;       ///< color buffer (3 * h * ch items)

  93.     AVAudioFifo *fifo;

  94.     int64_t pts;

  95.     int64_t old_pts;

  96.     int old_len;

  97.     int single_pic;

  98.     int legend;

  99.     int start_x, start_y;

  100.     int (*plot_channel)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs);

  101. } ShowSpectrumContext;

  102. 

  103. #define OFFSET(x) offsetof(ShowSpectrumContext, x)

  104. #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

  105. 

  106. static const AVOption showspectrum_options[] = {

  107.     { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "640x512"}, 0, 0, FLAGS },

  108.     { "s",    "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "640x512"}, 0, 0, FLAGS },

  109.     { "slide", "set sliding mode", OFFSET(sliding), AV_OPT_TYPE_INT, {.i64 = 0}, 0, NB_SLIDES-1, FLAGS, "slide" },

  110.         { "replace", "replace old columns with new", 0, AV_OPT_TYPE_CONST, {.i64=REPLACE}, 0, 0, FLAGS, "slide" },

  111.         { "scroll", "scroll from right to left", 0, AV_OPT_TYPE_CONST, {.i64=SCROLL}, 0, 0, FLAGS, "slide" },

  112.         { "fullframe", "return full frames", 0, AV_OPT_TYPE_CONST, {.i64=FULLFRAME}, 0, 0, FLAGS, "slide" },

  113.         { "rscroll", "scroll from left to right", 0, AV_OPT_TYPE_CONST, {.i64=RSCROLL}, 0, 0, FLAGS, "slide" },

  114.     { "mode", "set channel display mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=COMBINED}, COMBINED, NB_MODES-1, FLAGS, "mode" },

  115.         { "combined", "combined mode", 0, AV_OPT_TYPE_CONST, {.i64=COMBINED}, 0, 0, FLAGS, "mode" },

  116.         { "separate", "separate mode", 0, AV_OPT_TYPE_CONST, {.i64=SEPARATE}, 0, 0, FLAGS, "mode" },

  117.     { "color", "set channel coloring", OFFSET(color_mode), AV_OPT_TYPE_INT, {.i64=CHANNEL}, CHANNEL, NB_CLMODES-1, FLAGS, "color" },

  118.         { "channel",   "separate color for each channel", 0, AV_OPT_TYPE_CONST, {.i64=CHANNEL},   0, 0, FLAGS, "color" },

  119.         { "intensity", "intensity based coloring",        0, AV_OPT_TYPE_CONST, {.i64=INTENSITY}, 0, 0, FLAGS, "color" },

  120.         { "rainbow",   "rainbow based coloring",          0, AV_OPT_TYPE_CONST, {.i64=RAINBOW},   0, 0, FLAGS, "color" },

  121.         { "moreland",  "moreland based coloring",         0, AV_OPT_TYPE_CONST, {.i64=MORELAND},  0, 0, FLAGS, "color" },

  122.         { "nebulae",   "nebulae based coloring",          0, AV_OPT_TYPE_CONST, {.i64=NEBULAE},   0, 0, FLAGS, "color" },

  123.         { "fire",      "fire based coloring",             0, AV_OPT_TYPE_CONST, {.i64=FIRE},      0, 0, FLAGS, "color" },

  124.         { "fiery",     "fiery based coloring",            0, AV_OPT_TYPE_CONST, {.i64=FIERY},     0, 0, FLAGS, "color" },

  125.         { "fruit",     "fruit based coloring",            0, AV_OPT_TYPE_CONST, {.i64=FRUIT},     0, 0, FLAGS, "color" },

  126.         { "cool",      "cool based coloring",             0, AV_OPT_TYPE_CONST, {.i64=COOL},      0, 0, FLAGS, "color" },

  127.         { "magma",     "magma based coloring",            0, AV_OPT_TYPE_CONST, {.i64=MAGMA},     0, 0, FLAGS, "color" },

  128.         { "green",     "green based coloring",            0, AV_OPT_TYPE_CONST, {.i64=GREEN},     0, 0, FLAGS, "color" },

  129.         { "viridis",   "viridis based coloring",          0, AV_OPT_TYPE_CONST, {.i64=VIRIDIS},   0, 0, FLAGS, "color" },

  130.         { "plasma",    "plasma based coloring",           0, AV_OPT_TYPE_CONST, {.i64=PLASMA},    0, 0, FLAGS, "color" },

  131.         { "cividis",   "cividis based coloring",          0, AV_OPT_TYPE_CONST, {.i64=CIVIDIS},   0, 0, FLAGS, "color" },

  132.         { "terrain",   "terrain based coloring",          0, AV_OPT_TYPE_CONST, {.i64=TERRAIN},   0, 0, FLAGS, "color" },

  133.     { "scale", "set display scale", OFFSET(scale), AV_OPT_TYPE_INT, {.i64=SQRT}, LINEAR, NB_SCALES-1, FLAGS, "scale" },

  134.         { "lin",  "linear",      0, AV_OPT_TYPE_CONST, {.i64=LINEAR}, 0, 0, FLAGS, "scale" },

  135.         { "sqrt", "square root", 0, AV_OPT_TYPE_CONST, {.i64=SQRT},   0, 0, FLAGS, "scale" },

  136.         { "cbrt", "cubic root",  0, AV_OPT_TYPE_CONST, {.i64=CBRT},   0, 0, FLAGS, "scale" },

  137.         { "log",  "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=LOG},    0, 0, FLAGS, "scale" },

  138.         { "4thrt","4th root",    0, AV_OPT_TYPE_CONST, {.i64=FOURTHRT}, 0, 0, FLAGS, "scale" },

  139.         { "5thrt","5th root",    0, AV_OPT_TYPE_CONST, {.i64=FIFTHRT},  0, 0, FLAGS, "scale" },

  140.     { "fscale", "set frequency scale", OFFSET(fscale), AV_OPT_TYPE_INT, {.i64=F_LINEAR}, 0, NB_FSCALES-1, FLAGS, "fscale" },

  141.         { "lin",  "linear",      0, AV_OPT_TYPE_CONST, {.i64=F_LINEAR}, 0, 0, FLAGS, "fscale" },

  142.         { "log",  "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=F_LOG},    0, 0, FLAGS, "fscale" },

  143.     { "saturation", "color saturation multiplier", OFFSET(saturation), AV_OPT_TYPE_FLOAT, {.dbl = 1}, -10, 10, FLAGS },

  144.     { "win_func", "set window function", OFFSET(win_func), AV_OPT_TYPE_INT, {.i64 = WFUNC_HANNING}, 0, NB_WFUNC-1, FLAGS, "win_func" },

  145.         { "rect",     "Rectangular",      0, AV_OPT_TYPE_CONST, {.i64=WFUNC_RECT},     0, 0, FLAGS, "win_func" },

  146.         { "bartlett", "Bartlett",         0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BARTLETT}, 0, 0, FLAGS, "win_func" },

  147.         { "hann",     "Hann",             0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HANNING},  0, 0, FLAGS, "win_func" },

  148.         { "hanning",  "Hanning",          0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HANNING},  0, 0, FLAGS, "win_func" },

  149.         { "hamming",  "Hamming",          0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HAMMING},  0, 0, FLAGS, "win_func" },

  150.         { "blackman", "Blackman",         0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BLACKMAN}, 0, 0, FLAGS, "win_func" },

  151.         { "welch",    "Welch",            0, AV_OPT_TYPE_CONST, {.i64=WFUNC_WELCH},    0, 0, FLAGS, "win_func" },

  152.         { "flattop",  "Flat-top",         0, AV_OPT_TYPE_CONST, {.i64=WFUNC_FLATTOP},  0, 0, FLAGS, "win_func" },

  153.         { "bharris",  "Blackman-Harris",  0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHARRIS},  0, 0, FLAGS, "win_func" },

  154.         { "bnuttall", "Blackman-Nuttall", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BNUTTALL}, 0, 0, FLAGS, "win_func" },

  155.         { "bhann",    "Bartlett-Hann",    0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHANN},    0, 0, FLAGS, "win_func" },

  156.         { "sine",     "Sine",             0, AV_OPT_TYPE_CONST, {.i64=WFUNC_SINE},     0, 0, FLAGS, "win_func" },

  157.         { "nuttall",  "Nuttall",          0, AV_OPT_TYPE_CONST, {.i64=WFUNC_NUTTALL},  0, 0, FLAGS, "win_func" },

  158.         { "lanczos",  "Lanczos",          0, AV_OPT_TYPE_CONST, {.i64=WFUNC_LANCZOS},  0, 0, FLAGS, "win_func" },

  159.         { "gauss",    "Gauss",            0, AV_OPT_TYPE_CONST, {.i64=WFUNC_GAUSS},    0, 0, FLAGS, "win_func" },

  160.         { "tukey",    "Tukey",            0, AV_OPT_TYPE_CONST, {.i64=WFUNC_TUKEY},    0, 0, FLAGS, "win_func" },

  161.         { "dolph",    "Dolph-Chebyshev",  0, AV_OPT_TYPE_CONST, {.i64=WFUNC_DOLPH},    0, 0, FLAGS, "win_func" },

  162.         { "cauchy",   "Cauchy",           0, AV_OPT_TYPE_CONST, {.i64=WFUNC_CAUCHY},   0, 0, FLAGS, "win_func" },

  163.         { "parzen",   "Parzen",           0, AV_OPT_TYPE_CONST, {.i64=WFUNC_PARZEN},   0, 0, FLAGS, "win_func" },

  164.         { "poisson",  "Poisson",          0, AV_OPT_TYPE_CONST, {.i64=WFUNC_POISSON},  0, 0, FLAGS, "win_func" },

  165.         { "bohman",   "Bohman",           0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BOHMAN},   0, 0, FLAGS, "win_func" },

  166.     { "orientation", "set orientation", OFFSET(orientation), AV_OPT_TYPE_INT, {.i64=VERTICAL}, 0, NB_ORIENTATIONS-1, FLAGS, "orientation" },

  167.         { "vertical",   NULL, 0, AV_OPT_TYPE_CONST, {.i64=VERTICAL},   0, 0, FLAGS, "orientation" },

  168.         { "horizontal", NULL, 0, AV_OPT_TYPE_CONST, {.i64=HORIZONTAL}, 0, 0, FLAGS, "orientation" },

  169.     { "overlap", "set window overlap", OFFSET(overlap), AV_OPT_TYPE_FLOAT, {.dbl = 0}, 0, 1, FLAGS },

  170.     { "gain", "set scale gain", OFFSET(gain), AV_OPT_TYPE_FLOAT, {.dbl = 1}, 0, 128, FLAGS },

  171.     { "data", "set data mode", OFFSET(data), AV_OPT_TYPE_INT, {.i64 = 0}, 0, NB_DMODES-1, FLAGS, "data" },

  172.         { "magnitude", NULL, 0, AV_OPT_TYPE_CONST, {.i64=D_MAGNITUDE}, 0, 0, FLAGS, "data" },

  173.         { "phase",     NULL, 0, AV_OPT_TYPE_CONST, {.i64=D_PHASE},     0, 0, FLAGS, "data" },

  174.     { "rotation", "color rotation", OFFSET(rotation), AV_OPT_TYPE_FLOAT, {.dbl = 0}, -1, 1, FLAGS },

  175.     { "start", "start frequency", OFFSET(start), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT32_MAX, FLAGS },

  176.     { "stop",  "stop frequency",  OFFSET(stop),  AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT32_MAX, FLAGS },

  177.     { "fps",   "set video rate",  OFFSET(rate_str), AV_OPT_TYPE_STRING, {.str = "auto"}, 0, 0, FLAGS },

  178.     { "legend", "draw legend", OFFSET(legend), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, FLAGS },

  179.     { NULL }

  180. };

  181. 

  182. AVFILTER_DEFINE_CLASS(showspectrum);

  183. 

  184. static const struct ColorTable {

  185.     float a, y, u, v;

  186. } color_table[][8] = {

  187.     [INTENSITY] = {

  188.     {    0,                  0,                  0,                   0 },

  189.     { 0.13, .03587126228984074,  .1573300977624594, -.02548747583751842 },

  190.     { 0.30, .18572281794568020,  .1772436246393981,  .17475554840414750 },

  191.     { 0.60, .28184980583656130, -.1593064119945782,  .47132074554608920 },

  192.     { 0.73, .65830621175547810, -.3716070802232764,  .24352759331252930 },

  193.     { 0.78, .76318535758242900, -.4307467689263783,  .16866496622310430 },

  194.     { 0.91, .95336363636363640, -.2045454545454546,  .03313636363636363 },

  195.     {    1,                  1,                  0,                   0 }},

  196.     [RAINBOW] = {

  197.     {    0,                  0,                  0,                   0 },

  198.     { 0.13,            44/256.,     (189-128)/256.,      (138-128)/256. },

  199.     { 0.25,            29/256.,     (186-128)/256.,      (119-128)/256. },

  200.     { 0.38,           119/256.,     (194-128)/256.,       (53-128)/256. },

  201.     { 0.60,           111/256.,      (73-128)/256.,       (59-128)/256. },

  202.     { 0.73,           205/256.,      (19-128)/256.,      (149-128)/256. },

  203.     { 0.86,           135/256.,      (83-128)/256.,      (200-128)/256. },

  204.     {    1,            73/256.,      (95-128)/256.,      (225-128)/256. }},

  205.     [MORELAND] = {

  206.     {    0,            44/256.,     (181-128)/256.,      (112-128)/256. },

  207.     { 0.13,           126/256.,     (177-128)/256.,      (106-128)/256. },

  208.     { 0.25,           164/256.,     (163-128)/256.,      (109-128)/256. },

  209.     { 0.38,           200/256.,     (140-128)/256.,      (120-128)/256. },

  210.     { 0.60,           201/256.,     (117-128)/256.,      (141-128)/256. },

  211.     { 0.73,           177/256.,     (103-128)/256.,      (165-128)/256. },

  212.     { 0.86,           136/256.,     (100-128)/256.,      (183-128)/256. },

  213.     {    1,            68/256.,     (117-128)/256.,      (203-128)/256. }},

  214.     [NEBULAE] = {

  215.     {    0,            10/256.,     (134-128)/256.,      (132-128)/256. },

  216.     { 0.23,            21/256.,     (137-128)/256.,      (130-128)/256. },

  217.     { 0.45,            35/256.,     (134-128)/256.,      (134-128)/256. },

  218.     { 0.57,            51/256.,     (130-128)/256.,      (139-128)/256. },

  219.     { 0.67,           104/256.,     (116-128)/256.,      (162-128)/256. },

  220.     { 0.77,           120/256.,     (105-128)/256.,      (188-128)/256. },

  221.     { 0.87,           140/256.,     (105-128)/256.,      (188-128)/256. },

  222.     {    1,                  1,                  0,                   0 }},

  223.     [FIRE] = {

  224.     {    0,                  0,                  0,                   0 },

  225.     { 0.23,            44/256.,     (132-128)/256.,      (127-128)/256. },

  226.     { 0.45,            62/256.,     (116-128)/256.,      (140-128)/256. },

  227.     { 0.57,            75/256.,     (105-128)/256.,      (152-128)/256. },

  228.     { 0.67,            95/256.,      (91-128)/256.,      (166-128)/256. },

  229.     { 0.77,           126/256.,      (74-128)/256.,      (172-128)/256. },

  230.     { 0.87,           164/256.,      (73-128)/256.,      (162-128)/256. },

  231.     {    1,                  1,                  0,                   0 }},

  232.     [FIERY] = {

  233.     {    0,                  0,                  0,                   0 },

  234.     { 0.23,            36/256.,     (116-128)/256.,      (163-128)/256. },

  235.     { 0.45,            52/256.,     (102-128)/256.,      (200-128)/256. },

  236.     { 0.57,           116/256.,      (84-128)/256.,      (196-128)/256. },

  237.     { 0.67,           157/256.,      (67-128)/256.,      (181-128)/256. },

  238.     { 0.77,           193/256.,      (40-128)/256.,      (155-128)/256. },

  239.     { 0.87,           221/256.,     (101-128)/256.,      (134-128)/256. },

  240.     {    1,                  1,                  0,                   0 }},

  241.     [FRUIT] = {

  242.     {    0,                  0,                  0,                   0 },

  243.     { 0.20,            29/256.,     (136-128)/256.,      (119-128)/256. },

  244.     { 0.30,            60/256.,     (119-128)/256.,       (90-128)/256. },

  245.     { 0.40,            85/256.,      (91-128)/256.,       (85-128)/256. },

  246.     { 0.50,           116/256.,      (70-128)/256.,      (105-128)/256. },

  247.     { 0.60,           151/256.,      (50-128)/256.,      (146-128)/256. },

  248.     { 0.70,           191/256.,      (63-128)/256.,      (178-128)/256. },

  249.     {    1,            98/256.,      (80-128)/256.,      (221-128)/256. }},

  250.     [COOL] = {

  251.     {    0,                  0,                  0,                   0 },

  252.     {  .15,                  0,                 .5,                 -.5 },

  253.     {    1,                  1,                -.5,                  .5 }},

  254.     [MAGMA] = {

  255.     {    0,                  0,                  0,                   0 },

  256.     { 0.10,            23/256.,     (175-128)/256.,      (120-128)/256. },

  257.     { 0.23,            43/256.,     (158-128)/256.,      (144-128)/256. },

  258.     { 0.35,            85/256.,     (138-128)/256.,      (179-128)/256. },

  259.     { 0.48,            96/256.,     (128-128)/256.,      (189-128)/256. },

  260.     { 0.64,           128/256.,     (103-128)/256.,      (214-128)/256. },

  261.     { 0.92,           205/256.,      (80-128)/256.,      (152-128)/256. },

  262.     {    1,                  1,                  0,                   0 }},

  263.     [GREEN] = {

  264.     {    0,                  0,                  0,                   0 },

  265.     {  .75,                 .5,                  0,                 -.5 },

  266.     {    1,                  1,                  0,                   0 }},

  267.     [VIRIDIS] = {

  268.     {    0,                  0,                  0,                   0 },

  269.     { 0.10,          0x39/255.,   (0x9D -128)/255.,    (0x8F -128)/255. },

  270.     { 0.23,          0x5C/255.,   (0x9A -128)/255.,    (0x68 -128)/255. },

  271.     { 0.35,          0x69/255.,   (0x93 -128)/255.,    (0x57 -128)/255. },

  272.     { 0.48,          0x76/255.,   (0x88 -128)/255.,    (0x4B -128)/255. },

  273.     { 0.64,          0x8A/255.,   (0x72 -128)/255.,    (0x4F -128)/255. },

  274.     { 0.80,          0xA3/255.,   (0x50 -128)/255.,    (0x66 -128)/255. },

  275.     {    1,          0xCC/255.,   (0x2F -128)/255.,    (0x87 -128)/255. }},

  276.     [PLASMA] = {

  277.     {    0,                  0,                  0,                   0 },

  278.     { 0.10,          0x27/255.,   (0xC2 -128)/255.,    (0x82 -128)/255. },

  279.     { 0.58,          0x5B/255.,   (0x9A -128)/255.,    (0xAE -128)/255. },

  280.     { 0.70,          0x89/255.,   (0x44 -128)/255.,    (0xAB -128)/255. },

  281.     { 0.80,          0xB4/255.,   (0x2B -128)/255.,    (0x9E -128)/255. },

  282.     { 0.91,          0xD2/255.,   (0x38 -128)/255.,    (0x92 -128)/255. },

  283.     {    1,                  1,                  0,                  0. }},

  284.     [CIVIDIS] = {

  285.     {    0,                  0,                  0,                   0 },

  286.     { 0.20,          0x28/255.,   (0x98 -128)/255.,    (0x6F -128)/255. },

  287.     { 0.50,          0x48/255.,   (0x95 -128)/255.,    (0x74 -128)/255. },

  288.     { 0.63,          0x69/255.,   (0x84 -128)/255.,    (0x7F -128)/255. },

  289.     { 0.76,          0x89/255.,   (0x75 -128)/255.,    (0x84 -128)/255. },

  290.     { 0.90,          0xCE/255.,   (0x35 -128)/255.,    (0x95 -128)/255. },

  291.     {    1,                  1,                  0,                  0. }},

  292.     [TERRAIN] = {

  293.     {    0,                  0,                  0,                   0 },

  294.     { 0.15,                  0,                 .5,                   0 },

  295.     { 0.60,                  1,                -.5,                 -.5 },

  296.     { 0.85,                  1,                -.5,                  .5 },

  297.     {    1,                  1,                  0,                   0 }},

  298. };

  299. 

  300. static av_cold void uninit(AVFilterContext *ctx)

  301. {

  302.     ShowSpectrumContext *s = ctx->priv;

  303.     int i;

  304. 

  305.     av_freep(&s->combine_buffer);

  306.     if (s->fft) {

  307.         for (i = 0; i < s->nb_display_channels; i++)

  308.             av_fft_end(s->fft[i]);

  309.     }

  310.     av_freep(&s->fft);

  311.     if (s->ifft) {

  312.         for (i = 0; i < s->nb_display_channels; i++)

  313.             av_fft_end(s->ifft[i]);

  314.     }

  315.     av_freep(&s->ifft);

  316.     if (s->fft_data) {

  317.         for (i = 0; i < s->nb_display_channels; i++)

  318.             av_freep(&s->fft_data[i]);

  319.     }

  320.     av_freep(&s->fft_data);

  321.     if (s->fft_scratch) {

  322.         for (i = 0; i < s->nb_display_channels; i++)

  323.             av_freep(&s->fft_scratch[i]);

  324.     }

  325.     av_freep(&s->fft_scratch);

  326.     if (s->color_buffer) {

  327.         for (i = 0; i < s->nb_display_channels; i++)

  328.             av_freep(&s->color_buffer[i]);

  329.     }

  330.     av_freep(&s->color_buffer);

  331.     av_freep(&s->window_func_lut);

  332.     if (s->magnitudes) {

  333.         for (i = 0; i < s->nb_display_channels; i++)

  334.             av_freep(&s->magnitudes[i]);

  335.     }

  336.     av_freep(&s->magnitudes);

  337.     av_frame_free(&s->outpicref);

  338.     av_audio_fifo_free(s->fifo);

  339.     if (s->phases) {

  340.         for (i = 0; i < s->nb_display_channels; i++)

  341.             av_freep(&s->phases[i]);

  342.     }

  343.     av_freep(&s->phases);

  344. }

  345. 

  346. static int query_formats(AVFilterContext *ctx)

  347. {

  348.     AVFilterFormats *formats = NULL;

  349.     AVFilterChannelLayouts *layouts = NULL;

  350.     AVFilterLink *inlink = ctx->inputs[0];

  351.     AVFilterLink *outlink = ctx->outputs[0];

  352.     static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_NONE };

  353.     static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_NONE };

  354.     int ret;

  355. 

  356.     /* set input audio formats */

  357.     formats = ff_make_format_list(sample_fmts);

  358.     if ((ret = ff_formats_ref(formats, &inlink->out_formats)) < 0)

  359.         return ret;

  360. 

  361.     layouts = ff_all_channel_layouts();

  362.     if ((ret = ff_channel_layouts_ref(layouts, &inlink->out_channel_layouts)) < 0)

  363.         return ret;

  364. 

  365.     formats = ff_all_samplerates();

  366.     if ((ret = ff_formats_ref(formats, &inlink->out_samplerates)) < 0)

  367.         return ret;

  368. 

  369.     /* set output video format */

  370.     formats = ff_make_format_list(pix_fmts);

  371.     if ((ret = ff_formats_ref(formats, &outlink->in_formats)) < 0)

  372.         return ret;

  373. 

  374.     return 0;

  375. }

  376. 

  377. static int run_channel_fft(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)

  378. {

  379.     ShowSpectrumContext *s = ctx->priv;

  380.     AVFilterLink *inlink = ctx->inputs[0];

  381.     const float *window_func_lut = s->window_func_lut;

  382.     AVFrame *fin = arg;

  383.     const int ch = jobnr;

  384.     int n;

  385. 

  386.     /* fill FFT input with the number of samples available */

  387.     const float *p = (float *)fin->extended_data[ch];

  388. 

  389.     for (n = 0; n < s->win_size; n++) {

  390.         s->fft_data[ch][n].re = p[n] * window_func_lut[n];

  391.         s->fft_data[ch][n].im = 0;

  392.     }

  393. 

  394.     if (s->stop) {

  395.         float theta, phi, psi, a, b, S, c;

  396.         FFTComplex *g = s->fft_data[ch];

  397.         FFTComplex *h = s->fft_scratch[ch];

  398.         int L = s->buf_size;

  399.         int N = s->win_size;

  400.         int M = s->win_size / 2;

  401. 

  402.         phi = 2.f * M_PI * (s->stop - s->start) / (float)inlink->sample_rate / (M - 1);

  403.         theta = 2.f * M_PI * s->start / (float)inlink->sample_rate;

  404. 

  405.         for (int n = 0; n < M; n++) {

  406.             h[n].re = cosf(n * n / 2.f * phi);

  407.             h[n].im = sinf(n * n / 2.f * phi);

  408.         }

  409. 

  410.         for (int n = M; n < L; n++) {

  411.             h[n].re = 0.f;

  412.             h[n].im = 0.f;

  413.         }

  414. 

  415.         for (int n = L - N; n < L; n++) {

  416.             h[n].re = cosf((L - n) * (L - n) / 2.f * phi);

  417.             h[n].im = sinf((L - n) * (L - n) / 2.f * phi);

  418.         }

  419. 

  420.         for (int n = 0; n < N; n++) {

  421.             g[n].re = s->fft_data[ch][n].re;

  422.             g[n].im = s->fft_data[ch][n].im;

  423.         }

  424. 

  425.         for (int n = N; n < L; n++) {

  426.             g[n].re = 0.f;

  427.             g[n].im = 0.f;

  428.         }

  429. 

  430.         for (int n = 0; n < N; n++) {

  431.             psi = n * theta + n * n / 2.f * phi;

  432.             c =  cosf(psi);

  433.             S = -sinf(psi);

  434.             a = c * g[n].re - S * g[n].im;

  435.             b = S * g[n].re + c * g[n].im;

  436.             g[n].re = a;

  437.             g[n].im = b;

  438.         }

  439. 

  440.         av_fft_permute(s->fft[ch], h);

  441.         av_fft_calc(s->fft[ch], h);

  442. 

  443.         av_fft_permute(s->fft[ch], g);

  444.         av_fft_calc(s->fft[ch], g);

  445. 

  446.         for (int n = 0; n < L; n++) {

  447.             c = g[n].re;

  448.             S = g[n].im;

  449.             a = c * h[n].re - S * h[n].im;

  450.             b = S * h[n].re + c * h[n].im;

  451. 

  452.             g[n].re = a / L;

  453.             g[n].im = b / L;

  454.         }

  455. 

  456.         av_fft_permute(s->ifft[ch], g);

  457.         av_fft_calc(s->ifft[ch], g);

  458. 

  459.         for (int k = 0; k < M; k++) {

  460.             psi = k * k / 2.f * phi;

  461.             c =  cosf(psi);

  462.             S = -sinf(psi);

  463.             a = c * g[k].re - S * g[k].im;

  464.             b = S * g[k].re + c * g[k].im;

  465.             s->fft_data[ch][k].re = a;

  466.             s->fft_data[ch][k].im = b;

  467.         }

  468.     } else {

  469.         /* run FFT on each samples set */

  470.         av_fft_permute(s->fft[ch], s->fft_data[ch]);

  471.         av_fft_calc(s->fft[ch], s->fft_data[ch]);

  472.     }

  473. 

  474.     return 0;

  475. }

  476. 

  477. static void drawtext(AVFrame *pic, int x, int y, const char *txt, int o)

  478. {

  479.     const uint8_t *font;

  480.     int font_height;

  481.     int i;

  482. 

  483.     font = avpriv_cga_font,   font_height =  8;

  484. 

  485.     for (i = 0; txt[i]; i++) {

  486.         int char_y, mask;

  487. 

  488.         if (o) {

  489.             for (char_y = font_height - 1; char_y >= 0; char_y--) {

  490.                 uint8_t *p = pic->data[0] + (y + i * 10) * pic->linesize[0] + x;

  491.                 for (mask = 0x80; mask; mask >>= 1) {

  492.                     if (font[txt[i] * font_height + font_height - 1 - char_y] & mask)

  493.                         p[char_y] = ~p[char_y];

  494.                     p += pic->linesize[0];

  495.                 }

  496.             }

  497.         } else {

  498.             uint8_t *p = pic->data[0] + y*pic->linesize[0] + (x + i*8);

  499.             for (char_y = 0; char_y < font_height; char_y++) {

  500.                 for (mask = 0x80; mask; mask >>= 1) {

  501.                     if (font[txt[i] * font_height + char_y] & mask)

  502.                         *p = ~(*p);

  503.                     p++;

  504.                 }

  505.                 p += pic->linesize[0] - 8;

  506.             }

  507.         }

  508.     }

  509. }

  510. 

  511. static void color_range(ShowSpectrumContext *s, int ch,

  512.                         float *yf, float *uf, float *vf)

  513. {

  514.     switch (s->mode) {

  515.     case COMBINED:

  516.         // reduce range by channel count

  517.         *yf = 256.0f / s->nb_display_channels;

  518.         switch (s->color_mode) {

  519.         case RAINBOW:

  520.         case MORELAND:

  521.         case NEBULAE:

  522.         case FIRE:

  523.         case FIERY:

  524.         case FRUIT:

  525.         case COOL:

  526.         case GREEN:

  527.         case VIRIDIS:

  528.         case PLASMA:

  529.         case CIVIDIS:

  530.         case TERRAIN:

  531.         case MAGMA:

  532.         case INTENSITY:

  533.             *uf = *yf;

  534.             *vf = *yf;

  535.             break;

  536.         case CHANNEL:

  537.             /* adjust saturation for mixed UV coloring */

  538.             /* this factor is correct for infinite channels, an approximation otherwise */

  539.             *uf = *yf * M_PI;

  540.             *vf = *yf * M_PI;

  541.             break;

  542.         default:

  543.             av_assert0(0);

  544.         }

  545.         break;

  546.     case SEPARATE:

  547.         // full range

  548.         *yf = 256.0f;

  549.         *uf = 256.0f;

  550.         *vf = 256.0f;

  551.         break;

  552.     default:

  553.         av_assert0(0);

  554.     }

  555. 

  556.     if (s->color_mode == CHANNEL) {

  557.         if (s->nb_display_channels > 1) {

  558.             *uf *= 0.5f * sinf((2 * M_PI * ch) / s->nb_display_channels + M_PI * s->rotation);

  559.             *vf *= 0.5f * cosf((2 * M_PI * ch) / s->nb_display_channels + M_PI * s->rotation);

  560.         } else {

  561.             *uf *= 0.5f * sinf(M_PI * s->rotation);

  562.             *vf *= 0.5f * cosf(M_PI * s->rotation + M_PI_2);

  563.         }

  564.     } else {

  565.         *uf += *uf * sinf(M_PI * s->rotation);

  566.         *vf += *vf * cosf(M_PI * s->rotation + M_PI_2);

  567.     }

  568. 

  569.     *uf *= s->saturation;

  570.     *vf *= s->saturation;

  571. }

  572. 

  573. static void pick_color(ShowSpectrumContext *s,

  574.                        float yf, float uf, float vf,

  575.                        float a, float *out)

  576. {

  577.     if (s->color_mode > CHANNEL) {

  578.         const int cm = s->color_mode;

  579.         float y, u, v;

  580.         int i;

  581. 

  582.         for (i = 1; i < FF_ARRAY_ELEMS(color_table[cm]) - 1; i++)

  583.             if (color_table[cm][i].a >= a)

  584.                 break;

  585.         // i now is the first item >= the color

  586.         // now we know to interpolate between item i - 1 and i

  587.         if (a <= color_table[cm][i - 1].a) {

  588.             y = color_table[cm][i - 1].y;

  589.             u = color_table[cm][i - 1].u;

  590.             v = color_table[cm][i - 1].v;

  591.         } else if (a >= color_table[cm][i].a) {

  592.             y = color_table[cm][i].y;

  593.             u = color_table[cm][i].u;

  594.             v = color_table[cm][i].v;

  595.         } else {

  596.             float start = color_table[cm][i - 1].a;

  597.             float end = color_table[cm][i].a;

  598.             float lerpfrac = (a - start) / (end - start);

  599.             y = color_table[cm][i - 1].y * (1.0f - lerpfrac)

  600.               + color_table[cm][i].y * lerpfrac;

  601.             u = color_table[cm][i - 1].u * (1.0f - lerpfrac)

  602.               + color_table[cm][i].u * lerpfrac;

  603.             v = color_table[cm][i - 1].v * (1.0f - lerpfrac)

  604.               + color_table[cm][i].v * lerpfrac;

  605.         }

  606. 

  607.         out[0] = y * yf;

  608.         out[1] = u * uf;

  609.         out[2] = v * vf;

  610.     } else {

  611.         out[0] = a * yf;

  612.         out[1] = a * uf;

  613.         out[2] = a * vf;

  614.     }

  615. }

  616. 

  617. static char *get_time(AVFilterContext *ctx, float seconds, int x)

  618. {

  619.     char *units;

  620. 

  621.     if (x == 0)

  622.         units = av_asprintf("0");

  623.     else if (log10(seconds) > 6)

  624.         units = av_asprintf("%.2fh", seconds / (60 * 60));

  625.     else if (log10(seconds) > 3)

  626.         units = av_asprintf("%.2fm", seconds / 60);

  627.     else

  628.         units = av_asprintf("%.2fs", seconds);

  629.     return units;

  630. }

  631. 

  632. static float log_scale(const float value, const float min, const float max)

  633. {

  634.     if (value < min)

  635.         return min;

  636.     if (value > max)

  637.         return max;

  638. 

  639.     {

  640.         const float b = logf(max / min) / (max - min);

  641.         const float a = max / expf(max * b);

  642. 

  643.         return expf(value * b) * a;

  644.     }

  645. }

  646. 

  647. static float get_log_hz(const int bin, const int num_bins, const float sample_rate)

  648. {

  649.     const float max_freq = sample_rate / 2;

  650.     const float hz_per_bin = max_freq / num_bins;

  651.     const float freq = hz_per_bin * bin;

  652.     const float scaled_freq = log_scale(freq + 1, 21, max_freq) - 1;

  653. 

  654.     return num_bins * scaled_freq / max_freq;

  655. }

  656. 

  657. static float inv_log_scale(const float value, const float min, const float max)

  658. {

  659.     if (value < min)

  660.         return min;

  661.     if (value > max)

  662.         return max;

  663. 

  664.     {

  665.         const float b = logf(max / min) / (max - min);

  666.         const float a = max / expf(max * b);

  667. 

  668.         return logf(value / a) / b;

  669.     }

  670. }

  671. 

  672. static float bin_pos(const int bin, const int num_bins, const float sample_rate)

  673. {

  674.     const float max_freq = sample_rate / 2;

  675.     const float hz_per_bin = max_freq / num_bins;

  676.     const float freq = hz_per_bin * bin;

  677.     const float scaled_freq = inv_log_scale(freq + 1, 21, max_freq) - 1;

  678. 

  679.     return num_bins * scaled_freq / max_freq;

  680. }

  681. 

  682. static int draw_legend(AVFilterContext *ctx, int samples)

  683. {

  684.     ShowSpectrumContext *s = ctx->priv;

  685.     AVFilterLink *inlink = ctx->inputs[0];

  686.     AVFilterLink *outlink = ctx->outputs[0];

  687.     int ch, y, x = 0, sz = s->orientation == VERTICAL ? s->w : s->h;

  688.     int multi = (s->mode == SEPARATE && s->color_mode == CHANNEL);

  689.     float spp = samples / (float)sz;

  690.     char *text;

  691.     uint8_t *dst;

  692.     char chlayout_str[128];

  693. 

  694.     av_get_channel_layout_string(chlayout_str, sizeof(chlayout_str), inlink->channels,

  695.                                  inlink->channel_layout);

  696. 

  697.     text = av_asprintf("%d Hz | %s", inlink->sample_rate, chlayout_str);

  698.     if (!text)

  699.         return AVERROR(ENOMEM);

  700. 

  701.     drawtext(s->outpicref, 2, outlink->h - 10, "CREATED BY LIBAVFILTER", 0);

  702.     drawtext(s->outpicref, outlink->w - 2 - strlen(text) * 10, outlink->h - 10, text, 0);

  703.     av_freep(&text);

  704.     if (s->stop) {

  705.         text = av_asprintf("Zoom: %d Hz - %d Hz", s->start, s->stop);

  706.         if (!text)

  707.             return AVERROR(ENOMEM);

  708.         drawtext(s->outpicref, outlink->w - 2 - strlen(text) * 10, 3, text, 0);

  709.         av_freep(&text);

  710.     }

  711. 

  712.     dst = s->outpicref->data[0] + (s->start_y - 1) * s->outpicref->linesize[0] + s->start_x - 1;

  713.     for (x = 0; x < s->w + 1; x++)

  714.         dst[x] = 200;

  715.     dst = s->outpicref->data[0] + (s->start_y + s->h) * s->outpicref->linesize[0] + s->start_x - 1;

  716.     for (x = 0; x < s->w + 1; x++)

  717.         dst[x] = 200;

  718.     for (y = 0; y < s->h + 2; y++) {

  719.         dst = s->outpicref->data[0] + (y + s->start_y - 1) * s->outpicref->linesize[0];

  720.         dst[s->start_x - 1] = 200;

  721.         dst[s->start_x + s->w] = 200;

  722.     }

  723.     if (s->orientation == VERTICAL) {

  724.         int h = s->mode == SEPARATE ? s->h / s->nb_display_channels : s->h;

  725.         int hh = s->mode == SEPARATE ? -(s->h % s->nb_display_channels) + 1 : 1;

  726.         for (ch = 0; ch < (s->mode == SEPARATE ? s->nb_display_channels : 1); ch++) {

  727.             for (y = 0; y < h; y += 20) {

  728.                 dst = s->outpicref->data[0] + (s->start_y + h * (ch + 1) - y - hh) * s->outpicref->linesize[0];

  729.                 dst[s->start_x - 2] = 200;

  730.                 dst[s->start_x + s->w + 1] = 200;

  731.             }

  732.             for (y = 0; y < h; y += 40) {

  733.                 dst = s->outpicref->data[0] + (s->start_y + h * (ch + 1) - y - hh) * s->outpicref->linesize[0];

  734.                 dst[s->start_x - 3] = 200;

  735.                 dst[s->start_x + s->w + 2] = 200;

  736.             }

  737.             dst = s->outpicref->data[0] + (s->start_y - 2) * s->outpicref->linesize[0] + s->start_x;

  738.             for (x = 0; x < s->w; x+=40)

  739.                 dst[x] = 200;

  740.             dst = s->outpicref->data[0] + (s->start_y - 3) * s->outpicref->linesize[0] + s->start_x;

  741.             for (x = 0; x < s->w; x+=80)

  742.                 dst[x] = 200;

  743.             dst = s->outpicref->data[0] + (s->h + s->start_y + 1) * s->outpicref->linesize[0] + s->start_x;

  744.             for (x = 0; x < s->w; x+=40) {

  745.                 dst[x] = 200;

  746.             }

  747.             dst = s->outpicref->data[0] + (s->h + s->start_y + 2) * s->outpicref->linesize[0] + s->start_x;

  748.             for (x = 0; x < s->w; x+=80) {

  749.                 dst[x] = 200;

  750.             }

  751.             for (y = 0; y < h; y += 40) {

  752.                 float range = s->stop ? s->stop - s->start : inlink->sample_rate / 2;

  753.                 float bin = s->fscale == F_LINEAR ? y : get_log_hz(y, h, inlink->sample_rate);

  754.                 float hertz = s->start + bin * range / (float)(1 << (int)ceil(log2(h)));

  755.                 char *units;

  756. 

  757.                 if (hertz == 0)

  758.                     units = av_asprintf("DC");

  759.                 else

  760.                     units = av_asprintf("%.2f", hertz);

  761.                 if (!units)

  762.                     return AVERROR(ENOMEM);

  763. 

  764.                 drawtext(s->outpicref, s->start_x - 8 * strlen(units) - 4, h * (ch + 1) + s->start_y - y - 4 - hh, units, 0);

  765.                 av_free(units);

  766.             }

  767.         }

  768. 

  769.         for (x = 0; x < s->w && s->single_pic; x+=80) {

  770.             float seconds = x * spp / inlink->sample_rate;

  771.             char *units = get_time(ctx, seconds, x);

  772.             if (!units)

  773.                 return AVERROR(ENOMEM);

  774. 

  775.             drawtext(s->outpicref, s->start_x + x - 4 * strlen(units), s->h + s->start_y + 6, units, 0);

  776.             drawtext(s->outpicref, s->start_x + x - 4 * strlen(units), s->start_y - 12, units, 0);

  777.             av_free(units);

  778.         }

  779. 

  780.         drawtext(s->outpicref, outlink->w / 2 - 4 * 4, outlink->h - s->start_y / 2, "TIME", 0);

  781.         drawtext(s->outpicref, s->start_x / 7, outlink->h / 2 - 14 * 4, "FREQUENCY (Hz)", 1);

  782.     } else {

  783.         int w = s->mode == SEPARATE ? s->w / s->nb_display_channels : s->w;

  784.         for (y = 0; y < s->h; y += 20) {

  785.             dst = s->outpicref->data[0] + (s->start_y + y) * s->outpicref->linesize[0];

  786.             dst[s->start_x - 2] = 200;

  787.             dst[s->start_x + s->w + 1] = 200;

  788.         }

  789.         for (y = 0; y < s->h; y += 40) {

  790.             dst = s->outpicref->data[0] + (s->start_y + y) * s->outpicref->linesize[0];

  791.             dst[s->start_x - 3] = 200;

  792.             dst[s->start_x + s->w + 2] = 200;

  793.         }

  794.         for (ch = 0; ch < (s->mode == SEPARATE ? s->nb_display_channels : 1); ch++) {

  795.             dst = s->outpicref->data[0] + (s->start_y - 2) * s->outpicref->linesize[0] + s->start_x + w * ch;

  796.             for (x = 0; x < w; x+=40)

  797.                 dst[x] = 200;

  798.             dst = s->outpicref->data[0] + (s->start_y - 3) * s->outpicref->linesize[0] + s->start_x + w * ch;

  799.             for (x = 0; x < w; x+=80)

  800.                 dst[x] = 200;

  801.             dst = s->outpicref->data[0] + (s->h + s->start_y + 1) * s->outpicref->linesize[0] + s->start_x + w * ch;

  802.             for (x = 0; x < w; x+=40) {

  803.                 dst[x] = 200;

  804.             }

  805.             dst = s->outpicref->data[0] + (s->h + s->start_y + 2) * s->outpicref->linesize[0] + s->start_x + w * ch;

  806.             for (x = 0; x < w; x+=80) {

  807.                 dst[x] = 200;

  808.             }

  809.             for (x = 0; x < w - 79; x += 80) {

  810.                 float range = s->stop ? s->stop - s->start : inlink->sample_rate / 2;

  811.                 float bin = s->fscale == F_LINEAR ? x : get_log_hz(x, w, inlink->sample_rate);

  812.                 float hertz = s->start + bin * range / (float)(1 << (int)ceil(log2(w)));

  813.                 char *units;

  814. 

  815.                 if (hertz == 0)

  816.                     units = av_asprintf("DC");

  817.                 else

  818.                     units = av_asprintf("%.2f", hertz);

  819.                 if (!units)

  820.                     return AVERROR(ENOMEM);

  821. 

  822.                 drawtext(s->outpicref, s->start_x - 4 * strlen(units) + x + w * ch, s->start_y - 12, units, 0);

  823.                 drawtext(s->outpicref, s->start_x - 4 * strlen(units) + x + w * ch, s->h + s->start_y + 6, units, 0);

  824.                 av_free(units);

  825.             }

  826.         }

  827.         for (y = 0; y < s->h && s->single_pic; y+=40) {

  828.             float seconds = y * spp / inlink->sample_rate;

  829.             char *units = get_time(ctx, seconds, x);

  830.             if (!units)

  831.                 return AVERROR(ENOMEM);

  832. 

  833.             drawtext(s->outpicref, s->start_x - 8 * strlen(units) - 4, s->start_y + y - 4, units, 0);

  834.             av_free(units);

  835.         }

  836.         drawtext(s->outpicref, s->start_x / 7, outlink->h / 2 - 4 * 4, "TIME", 1);

  837.         drawtext(s->outpicref, outlink->w / 2 - 14 * 4, outlink->h - s->start_y / 2, "FREQUENCY (Hz)", 0);

  838.     }

  839. 

  840.     for (ch = 0; ch < (multi ? s->nb_display_channels : 1); ch++) {

  841.         int h = multi ? s->h / s->nb_display_channels : s->h;

  842. 

  843.         for (y = 0; y < h; y++) {

  844.             float out[3] = { 0., 127.5, 127.5};

  845.             int chn;

  846. 

  847.             for (chn = 0; chn < (s->mode == SEPARATE ? 1 : s->nb_display_channels); chn++) {

  848.                 float yf, uf, vf;

  849.                 int channel = (multi) ? s->nb_display_channels - ch - 1 : chn;

  850.                 float lout[3];

  851. 

  852.                 color_range(s, channel, &yf, &uf, &vf);

  853.                 pick_color(s, yf, uf, vf, y / (float)h, lout);

  854.                 out[0] += lout[0];

  855.                 out[1] += lout[1];

  856.                 out[2] += lout[2];

  857.             }

  858.             memset(s->outpicref->data[0]+(s->start_y + h * (ch + 1) - y - 1) * s->outpicref->linesize[0] + s->w + s->start_x + 20, av_clip_uint8(out[0]), 10);

  859.             memset(s->outpicref->data[1]+(s->start_y + h * (ch + 1) - y - 1) * s->outpicref->linesize[1] + s->w + s->start_x + 20, av_clip_uint8(out[1]), 10);

  860.             memset(s->outpicref->data[2]+(s->start_y + h * (ch + 1) - y - 1) * s->outpicref->linesize[2] + s->w + s->start_x + 20, av_clip_uint8(out[2]), 10);

  861.         }

  862. 

  863.         for (y = 0; ch == 0 && y < h; y += h / 10) {

  864.             float value = 120.f * log10f(1.f - y / (float)h);

  865.             char *text;

  866. 

  867.             if (value < -120)

  868.                 break;

  869.             text = av_asprintf("%.0f dB", value);

  870.             if (!text)

  871.                 continue;

  872.             drawtext(s->outpicref, s->w + s->start_x + 35, s->start_y + y - 5, text, 0);

  873.             av_free(text);

  874.         }

  875.     }

  876. 

  877.     return 0;

  878. }

  879. 

  880. static float get_value(AVFilterContext *ctx, int ch, int y)

  881. {

  882.     ShowSpectrumContext *s = ctx->priv;

  883.     float *magnitudes = s->magnitudes[ch];

  884.     float *phases = s->phases[ch];

  885.     float a;

  886. 

  887.     switch (s->data) {

  888.     case D_MAGNITUDE:

  889.         /* get magnitude */

  890.         a = magnitudes[y];

  891.         break;

  892.     case D_PHASE:

  893.         /* get phase */

  894.         a = phases[y];

  895.         break;

  896.     default:

  897.         av_assert0(0);

  898.     }

  899. 

  900.     /* apply scale */

  901.     switch (s->scale) {

  902.     case LINEAR:

  903.         a = av_clipf(a, 0, 1);

  904.         break;

  905.     case SQRT:

  906.         a = av_clipf(sqrtf(a), 0, 1);

  907.         break;

  908.     case CBRT:

  909.         a = av_clipf(cbrtf(a), 0, 1);

  910.         break;

  911.     case FOURTHRT:

  912.         a = av_clipf(sqrtf(sqrtf(a)), 0, 1);

  913.         break;

  914.     case FIFTHRT:

  915.         a = av_clipf(powf(a, 0.20), 0, 1);

  916.         break;

  917.     case LOG:

  918.         a = 1.f + log10f(av_clipf(a, 1e-6, 1)) / 6.f; // zero = -120dBFS

  919.         break;

  920.     default:

  921.         av_assert0(0);

  922.     }

  923. 

  924.     return a;

  925. }

  926. 

  927. static int plot_channel_lin(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)

  928. {

  929.     ShowSpectrumContext *s = ctx->priv;

  930.     const int h = s->orientation == VERTICAL ? s->channel_height : s->channel_width;

  931.     const int ch = jobnr;

  932.     float yf, uf, vf;

  933.     int y;

  934. 

  935.     /* decide color range */

  936.     color_range(s, ch, &yf, &uf, &vf);

  937. 

  938.     /* draw the channel */

  939.     for (y = 0; y < h; y++) {

  940.         int row = (s->mode == COMBINED) ? y : ch * h + y;

  941.         float *out = &s->color_buffer[ch][3 * row];

  942.         float a = get_value(ctx, ch, y);

  943. 

  944.         pick_color(s, yf, uf, vf, a, out);

  945.     }

  946. 

  947.     return 0;

  948. }

  949. 

  950. static int plot_channel_log(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)

  951. {

  952.     ShowSpectrumContext *s = ctx->priv;

  953.     AVFilterLink *inlink = ctx->inputs[0];

  954.     const int h = s->orientation == VERTICAL ? s->channel_height : s->channel_width;

  955.     const int ch = jobnr;

  956.     float y, yf, uf, vf;

  957.     int yy = 0;

  958. 

  959.     /* decide color range */

  960.     color_range(s, ch, &yf, &uf, &vf);

  961. 

  962.     /* draw the channel */

  963.     for (y = 0; y < h && yy < h; yy++) {

  964.         float pos0 = bin_pos(yy+0, h, inlink->sample_rate);

  965.         float pos1 = bin_pos(yy+1, h, inlink->sample_rate);

  966.         float delta = pos1 - pos0;

  967.         float a0, a1;

  968. 

  969.         a0 = get_value(ctx, ch, yy+0);

  970.         a1 = get_value(ctx, ch, FFMIN(yy+1, h-1));

  971.         for (float j = pos0; j < pos1 && y + j - pos0 < h; j++) {

  972.             float row = (s->mode == COMBINED) ? y + j - pos0 : ch * h + y + j - pos0;

  973.             float *out = &s->color_buffer[ch][3 * FFMIN(lrintf(row), h-1)];

  974.             float lerpfrac = (j - pos0) / delta;

  975. 

  976.             pick_color(s, yf, uf, vf, lerpfrac * a1 + (1.f-lerpfrac) * a0, out);

  977.         }

  978.         y += delta;

  979.     }

  980. 

  981.     return 0;

  982. }

  983. 

  984. static int config_output(AVFilterLink *outlink)

  985. {

  986.     AVFilterContext *ctx = outlink->src;

  987.     AVFilterLink *inlink = ctx->inputs[0];

  988.     ShowSpectrumContext *s = ctx->priv;

  989.     int i, fft_bits, h, w;

  990.     float overlap;

  991. 

  992.     switch (s->fscale) {

  993.     case F_LINEAR: s->plot_channel = plot_channel_lin; break;

  994.     case F_LOG:    s->plot_channel = plot_channel_log; break;

  995.     default: return AVERROR_BUG;

  996.     }

  997. 

  998.     s->stop = FFMIN(s->stop, inlink->sample_rate / 2);

  999.     if (s->stop && s->stop <= s->start) {

  1000.         av_log(ctx, AV_LOG_ERROR, "Stop frequency should be greater than start.\n");

  1001.         return AVERROR(EINVAL);

  1002.     }

  1003. 

  1004.     if (!strcmp(ctx->filter->name, "showspectrumpic"))

  1005.         s->single_pic = 1;

  1006. 

  1007.     outlink->w = s->w;

  1008.     outlink->h = s->h;

  1009.     outlink->sample_aspect_ratio = (AVRational){1,1};

  1010. 

  1011.     if (s->legend) {

  1012.         s->start_x = (log10(inlink->sample_rate) + 1) * 25;

  1013.         s->start_y = 64;

  1014.         outlink->w += s->start_x * 2;

  1015.         outlink->h += s->start_y * 2;

  1016.     }

  1017. 

  1018.     h = (s->mode == COMBINED || s->orientation == HORIZONTAL) ? s->h : s->h / inlink->channels;

  1019.     w = (s->mode == COMBINED || s->orientation == VERTICAL)   ? s->w : s->w / inlink->channels;

  1020.     s->channel_height = h;

  1021.     s->channel_width  = w;

  1022. 

  1023.     if (s->orientation == VERTICAL) {

  1024.         /* FFT window size (precision) according to the requested output frame height */

  1025.         for (fft_bits = 1; 1 << fft_bits < 2 * h; fft_bits++);

  1026.     } else {

  1027.         /* FFT window size (precision) according to the requested output frame width */

  1028.         for (fft_bits = 1; 1 << fft_bits < 2 * w; fft_bits++);

  1029.     }

  1030. 

  1031.     s->win_size = 1 << fft_bits;

  1032.     s->buf_size = s->win_size << !!s->stop;

  1033. 

  1034.     if (!s->fft) {

  1035.         s->fft = av_calloc(inlink->channels, sizeof(*s->fft));

  1036.         if (!s->fft)

  1037.             return AVERROR(ENOMEM);

  1038.     }

  1039. 

  1040.     if (s->stop) {

  1041.         if (!s->ifft) {

  1042.             s->ifft = av_calloc(inlink->channels, sizeof(*s->ifft));

  1043.             if (!s->ifft)

  1044.                 return AVERROR(ENOMEM);

  1045.         }

  1046.     }

  1047. 

  1048.     /* (re-)configuration if the video output changed (or first init) */

  1049.     if (fft_bits != s->fft_bits) {

  1050.         AVFrame *outpicref;

  1051. 

  1052.         s->fft_bits = fft_bits;

  1053. 

  1054.         /* FFT buffers: x2 for each (display) channel buffer.

  1055.          * Note: we use free and malloc instead of a realloc-like function to

  1056.          * make sure the buffer is aligned in memory for the FFT functions. */

  1057.         for (i = 0; i < s->nb_display_channels; i++) {

  1058.             if (s->stop) {

  1059.                 av_fft_end(s->ifft[i]);

  1060.                 av_freep(&s->fft_scratch[i]);

  1061.             }

  1062.             av_fft_end(s->fft[i]);

  1063.             av_freep(&s->fft_data[i]);

  1064.         }

  1065.         av_freep(&s->fft_data);

  1066. 

  1067.         s->nb_display_channels = inlink->channels;

  1068.         for (i = 0; i < s->nb_display_channels; i++) {

  1069.             s->fft[i] = av_fft_init(fft_bits + !!s->stop, 0);

  1070.             if (s->stop) {

  1071.                 s->ifft[i] = av_fft_init(fft_bits + !!s->stop, 1);

  1072.                 if (!s->ifft[i]) {

  1073.                     av_log(ctx, AV_LOG_ERROR, "Unable to create Inverse FFT context. "

  1074.                            "The window size might be too high.\n");

  1075.                     return AVERROR(EINVAL);

  1076.                 }

  1077.             }

  1078.             if (!s->fft[i]) {

  1079.                 av_log(ctx, AV_LOG_ERROR, "Unable to create FFT context. "

  1080.                        "The window size might be too high.\n");

  1081.                 return AVERROR(EINVAL);

  1082.             }

  1083.         }

  1084. 

  1085.         s->magnitudes = av_calloc(s->nb_display_channels, sizeof(*s->magnitudes));

  1086.         if (!s->magnitudes)

  1087.             return AVERROR(ENOMEM);

  1088.         for (i = 0; i < s->nb_display_channels; i++) {

  1089.             s->magnitudes[i] = av_calloc(s->orientation == VERTICAL ? s->h : s->w, sizeof(**s->magnitudes));

  1090.             if (!s->magnitudes[i])

  1091.                 return AVERROR(ENOMEM);

  1092.         }

  1093. 

  1094.         s->phases = av_calloc(s->nb_display_channels, sizeof(*s->phases));

  1095.         if (!s->phases)

  1096.             return AVERROR(ENOMEM);

  1097.         for (i = 0; i < s->nb_display_channels; i++) {

  1098.             s->phases[i] = av_calloc(s->orientation == VERTICAL ? s->h : s->w, sizeof(**s->phases));

  1099.             if (!s->phases[i])

  1100.                 return AVERROR(ENOMEM);

  1101.         }

  1102. 

  1103.         av_freep(&s->color_buffer);

  1104.         s->color_buffer = av_calloc(s->nb_display_channels, sizeof(*s->color_buffer));

  1105.         if (!s->color_buffer)

  1106.             return AVERROR(ENOMEM);

  1107.         for (i = 0; i < s->nb_display_channels; i++) {

  1108.             s->color_buffer[i] = av_calloc(s->orientation == VERTICAL ? s->h * 3 : s->w * 3, sizeof(**s->color_buffer));

  1109.             if (!s->color_buffer[i])

  1110.                 return AVERROR(ENOMEM);

  1111.         }

  1112. 

  1113.         s->fft_data = av_calloc(s->nb_display_channels, sizeof(*s->fft_data));

  1114.         if (!s->fft_data)

  1115.             return AVERROR(ENOMEM);

  1116.         s->fft_scratch = av_calloc(s->nb_display_channels, sizeof(*s->fft_scratch));

  1117.         if (!s->fft_scratch)

  1118.             return AVERROR(ENOMEM);

  1119.         for (i = 0; i < s->nb_display_channels; i++) {

  1120.             s->fft_data[i] = av_calloc(s->buf_size, sizeof(**s->fft_data));

  1121.             if (!s->fft_data[i])

  1122.                 return AVERROR(ENOMEM);

  1123. 

  1124.             s->fft_scratch[i] = av_calloc(s->buf_size, sizeof(**s->fft_scratch));

  1125.             if (!s->fft_scratch[i])

  1126.                 return AVERROR(ENOMEM);

  1127.         }

  1128. 

  1129.         /* pre-calc windowing function */

  1130.         s->window_func_lut =

  1131.             av_realloc_f(s->window_func_lut, s->win_size,

  1132.                          sizeof(*s->window_func_lut));

  1133.         if (!s->window_func_lut)

  1134.             return AVERROR(ENOMEM);

  1135.         generate_window_func(s->window_func_lut, s->win_size, s->win_func, &overlap);

  1136.         if (s->overlap == 1)

  1137.             s->overlap = overlap;

  1138.         s->hop_size = (1.f - s->overlap) * s->win_size;

  1139.         if (s->hop_size < 1) {

  1140.             av_log(ctx, AV_LOG_ERROR, "overlap %f too big\n", s->overlap);

  1141.             return AVERROR(EINVAL);

  1142.         }

  1143. 

  1144.         for (s->win_scale = 0, i = 0; i < s->win_size; i++) {

  1145.             s->win_scale += s->window_func_lut[i] * s->window_func_lut[i];

  1146.         }

  1147.         s->win_scale = 1.f / sqrtf(s->win_scale);

  1148. 

  1149.         /* prepare the initial picref buffer (black frame) */

  1150.         av_frame_free(&s->outpicref);

  1151.         s->outpicref = outpicref =

  1152.             ff_get_video_buffer(outlink, outlink->w, outlink->h);

  1153.         if (!outpicref)

  1154.             return AVERROR(ENOMEM);

  1155.         outpicref->sample_aspect_ratio = (AVRational){1,1};

  1156.         for (i = 0; i < outlink->h; i++) {

  1157.             memset(outpicref->data[0] + i * outpicref->linesize[0],   0, outlink->w);

  1158.             memset(outpicref->data[1] + i * outpicref->linesize[1], 128, outlink->w);

  1159.             memset(outpicref->data[2] + i * outpicref->linesize[2], 128, outlink->w);

  1160.         }

  1161.         outpicref->color_range = AVCOL_RANGE_JPEG;

  1162. 

  1163.         if (!s->single_pic && s->legend)

  1164.             draw_legend(ctx, 0);

  1165.     }

  1166. 

  1167.     if ((s->orientation == VERTICAL   && s->xpos >= s->w) ||

  1168.         (s->orientation == HORIZONTAL && s->xpos >= s->h))

  1169.         s->xpos = 0;

  1170. 

  1171.     s->auto_frame_rate = av_make_q(inlink->sample_rate, s->hop_size);

  1172.     if (s->orientation == VERTICAL && s->sliding == FULLFRAME)

  1173.         s->auto_frame_rate.den *= s->w;

  1174.     if (s->orientation == HORIZONTAL && s->sliding == FULLFRAME)

  1175.         s->auto_frame_rate.den *= s->h;

  1176.     if (!s->single_pic && strcmp(s->rate_str, "auto")) {

  1177.         int ret = av_parse_video_rate(&s->frame_rate, s->rate_str);

  1178.         if (ret < 0)

  1179.             return ret;

  1180.     } else {

  1181.         s->frame_rate = s->auto_frame_rate;

  1182.     }

  1183.     outlink->frame_rate = s->frame_rate;

  1184.     outlink->time_base = av_inv_q(outlink->frame_rate);

  1185. 

  1186.     if (s->orientation == VERTICAL) {

  1187.         s->combine_buffer =

  1188.             av_realloc_f(s->combine_buffer, s->h * 3,

  1189.                          sizeof(*s->combine_buffer));

  1190.     } else {

  1191.         s->combine_buffer =

  1192.             av_realloc_f(s->combine_buffer, s->w * 3,

  1193.                          sizeof(*s->combine_buffer));

  1194.     }

  1195. 

  1196.     av_log(ctx, AV_LOG_VERBOSE, "s:%dx%d FFT window size:%d\n",

  1197.            s->w, s->h, s->win_size);

  1198. 

  1199.     av_audio_fifo_free(s->fifo);

  1200.     s->fifo = av_audio_fifo_alloc(inlink->format, inlink->channels, s->win_size);

  1201.     if (!s->fifo)

  1202.         return AVERROR(ENOMEM);

  1203.     return 0;

  1204. }

  1205. 

  1206. #define RE(y, ch) s->fft_data[ch][y].re

  1207. #define IM(y, ch) s->fft_data[ch][y].im

  1208. #define MAGNITUDE(y, ch) hypotf(RE(y, ch), IM(y, ch))

  1209. #define PHASE(y, ch) atan2f(IM(y, ch), RE(y, ch))

  1210. 

  1211. static int calc_channel_magnitudes(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)

  1212. {

  1213.     ShowSpectrumContext *s = ctx->priv;

  1214.     const double w = s->win_scale * (s->scale == LOG ? s->win_scale : 1);

  1215.     int y, h = s->orientation == VERTICAL ? s->h : s->w;

  1216.     const float f = s->gain * w;

  1217.     const int ch = jobnr;

  1218.     float *magnitudes = s->magnitudes[ch];

  1219. 

  1220.     for (y = 0; y < h; y++)

  1221.         magnitudes[y] = MAGNITUDE(y, ch) * f;

  1222. 

  1223.     return 0;

  1224. }

  1225. 

  1226. static int calc_channel_phases(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)

  1227. {

  1228.     ShowSpectrumContext *s = ctx->priv;

  1229.     const int h = s->orientation == VERTICAL ? s->h : s->w;

  1230.     const int ch = jobnr;

  1231.     float *phases = s->phases[ch];

  1232.     int y;

  1233. 

  1234.     for (y = 0; y < h; y++)

  1235.         phases[y] = (PHASE(y, ch) / M_PI + 1) / 2;

  1236. 

  1237.     return 0;

  1238. }

  1239. 

  1240. static void acalc_magnitudes(ShowSpectrumContext *s)

  1241. {

  1242.     const double w = s->win_scale * (s->scale == LOG ? s->win_scale : 1);

  1243.     int ch, y, h = s->orientation == VERTICAL ? s->h : s->w;

  1244.     const float f = s->gain * w;

  1245. 

  1246.     for (ch = 0; ch < s->nb_display_channels; ch++) {

  1247.         float *magnitudes = s->magnitudes[ch];

  1248. 

  1249.         for (y = 0; y < h; y++)

  1250.             magnitudes[y] += MAGNITUDE(y, ch) * f;

  1251.     }

  1252. }

  1253. 

  1254. static void scale_magnitudes(ShowSpectrumContext *s, float scale)

  1255. {

  1256.     int ch, y, h = s->orientation == VERTICAL ? s->h : s->w;

  1257. 

  1258.     for (ch = 0; ch < s->nb_display_channels; ch++) {

  1259.         float *magnitudes = s->magnitudes[ch];

  1260. 

  1261.         for (y = 0; y < h; y++)

  1262.             magnitudes[y] *= scale;

  1263.     }

  1264. }

  1265. 

  1266. static void clear_combine_buffer(ShowSpectrumContext *s, int size)

  1267. {

  1268.     int y;

  1269. 

  1270.     for (y = 0; y < size; y++) {

  1271.         s->combine_buffer[3 * y    ] = 0;

  1272.         s->combine_buffer[3 * y + 1] = 127.5;

  1273.         s->combine_buffer[3 * y + 2] = 127.5;

  1274.     }

  1275. }

  1276. 

  1277. static int plot_spectrum_column(AVFilterLink *inlink, AVFrame *insamples)

  1278. {

  1279.     AVFilterContext *ctx = inlink->dst;

  1280.     AVFilterLink *outlink = ctx->outputs[0];

  1281.     ShowSpectrumContext *s = ctx->priv;

  1282.     AVFrame *outpicref = s->outpicref;

  1283.     int ret, plane, x, y, z = s->orientation == VERTICAL ? s->h : s->w;

  1284. 

  1285.     /* fill a new spectrum column */

  1286.     /* initialize buffer for combining to black */

  1287.     clear_combine_buffer(s, z);

  1288. 

  1289.     ctx->internal->execute(ctx, s->plot_channel, NULL, NULL, s->nb_display_channels);

  1290. 

  1291.     for (y = 0; y < z * 3; y++) {

  1292.         for (x = 0; x < s->nb_display_channels; x++) {

  1293.             s->combine_buffer[y] += s->color_buffer[x][y];

  1294.         }

  1295.     }

  1296. 

  1297.     av_frame_make_writable(s->outpicref);

  1298.     /* copy to output */

  1299.     if (s->orientation == VERTICAL) {

  1300.         if (s->sliding == SCROLL) {

  1301.             for (plane = 0; plane < 3; plane++) {

  1302.                 for (y = 0; y < s->h; y++) {

  1303.                     uint8_t *p = outpicref->data[plane] + s->start_x +

  1304.                                  (y + s->start_y) * outpicref->linesize[plane];

  1305.                     memmove(p, p + 1, s->w - 1);

  1306.                 }

  1307.             }

  1308.             s->xpos = s->w - 1;

  1309.         } else if (s->sliding == RSCROLL) {

  1310.             for (plane = 0; plane < 3; plane++) {

  1311.                 for (y = 0; y < s->h; y++) {

  1312.                     uint8_t *p = outpicref->data[plane] + s->start_x +

  1313.                                  (y + s->start_y) * outpicref->linesize[plane];

  1314.                     memmove(p + 1, p, s->w - 1);

  1315.                 }

  1316.             }

  1317.             s->xpos = 0;

  1318.         }

  1319.         for (plane = 0; plane < 3; plane++) {

  1320.             uint8_t *p = outpicref->data[plane] + s->start_x +

  1321.                          (outlink->h - 1 - s->start_y) * outpicref->linesize[plane] +

  1322.                          s->xpos;

  1323.             for (y = 0; y < s->h; y++) {

  1324.                 *p = lrintf(av_clipf(s->combine_buffer[3 * y + plane], 0, 255));

  1325.                 p -= outpicref->linesize[plane];

  1326.             }

  1327.         }

  1328.     } else {

  1329.         if (s->sliding == SCROLL) {

  1330.             for (plane = 0; plane < 3; plane++) {

  1331.                 for (y = 1; y < s->h; y++) {

  1332.                     memmove(outpicref->data[plane] + (y-1 + s->start_y) * outpicref->linesize[plane] + s->start_x,

  1333.                             outpicref->data[plane] + (y   + s->start_y) * outpicref->linesize[plane] + s->start_x,

  1334.                             s->w);

  1335.                 }

  1336.             }

  1337.             s->xpos = s->h - 1;

  1338.         } else if (s->sliding == RSCROLL) {

  1339.             for (plane = 0; plane < 3; plane++) {

  1340.                 for (y = s->h - 1; y >= 1; y--) {

  1341.                     memmove(outpicref->data[plane] + (y   + s->start_y) * outpicref->linesize[plane] + s->start_x,

  1342.                             outpicref->data[plane] + (y-1 + s->start_y) * outpicref->linesize[plane] + s->start_x,

  1343.                             s->w);

  1344.                 }

  1345.             }

  1346.             s->xpos = 0;

  1347.         }

  1348.         for (plane = 0; plane < 3; plane++) {

  1349.             uint8_t *p = outpicref->data[plane] + s->start_x +

  1350.                          (s->xpos + s->start_y) * outpicref->linesize[plane];

  1351.             for (x = 0; x < s->w; x++) {

  1352.                 *p = lrintf(av_clipf(s->combine_buffer[3 * x + plane], 0, 255));

  1353.                 p++;

  1354.             }

  1355.         }

  1356.     }

  1357. 

  1358.     if (s->sliding != FULLFRAME || s->xpos == 0)

  1359.         outpicref->pts = av_rescale_q(insamples->pts, inlink->time_base, outlink->time_base);

  1360. 

  1361.     s->xpos++;

  1362.     if (s->orientation == VERTICAL && s->xpos >= s->w)

  1363.         s->xpos = 0;

  1364.     if (s->orientation == HORIZONTAL && s->xpos >= s->h)

  1365.         s->xpos = 0;

  1366.     if (!s->single_pic && (s->sliding != FULLFRAME || s->xpos == 0)) {

  1367.         if (s->old_pts < outpicref->pts) {

  1368.             AVFrame *clone;

  1369. 

  1370.             if (s->legend) {

  1371.                 char *units = get_time(ctx, insamples->pts /(float)inlink->sample_rate, x);

  1372.                 if (!units)

  1373.                     return AVERROR(ENOMEM);

  1374. 

  1375.                 if (s->orientation == VERTICAL) {

  1376.                     for (y = 0; y < 10; y++) {

  1377.                         memset(s->outpicref->data[0] + outlink->w / 2 - 4 * s->old_len +

  1378.                                (outlink->h - s->start_y / 2 - 20 + y) * s->outpicref->linesize[0], 0, 10 * s->old_len);

  1379.                     }

  1380.                     drawtext(s->outpicref,

  1381.                              outlink->w / 2 - 4 * strlen(units),

  1382.                              outlink->h - s->start_y / 2 - 20,

  1383.                              units, 0);

  1384.                 } else  {

  1385.                     for (y = 0; y < 10 * s->old_len; y++) {

  1386.                         memset(s->outpicref->data[0] + s->start_x / 7 + 20 +

  1387.                                (outlink->h / 2 - 4 * s->old_len + y) * s->outpicref->linesize[0], 0, 10);

  1388.                     }

  1389.                     drawtext(s->outpicref,

  1390.                              s->start_x / 7 + 20,

  1391.                              outlink->h / 2 - 4 * strlen(units),

  1392.                              units, 1);

  1393.                 }

  1394.                 s->old_len = strlen(units);

  1395.                 av_free(units);

  1396.             }

  1397.             s->old_pts = outpicref->pts;

  1398.             clone = av_frame_clone(s->outpicref);

  1399.             if (!clone)

  1400.                 return AVERROR(ENOMEM);

  1401.             ret = ff_filter_frame(outlink, clone);

  1402.             if (ret < 0)

  1403.                 return ret;

  1404.             return 0;

  1405.         }

  1406.     }

  1407. 

  1408.     return 1;

  1409. }

  1410. 

  1411. #if CONFIG_SHOWSPECTRUM_FILTER

  1412. 

  1413. static int activate(AVFilterContext *ctx)

  1414. {

  1415.     AVFilterLink *inlink = ctx->inputs[0];

  1416.     AVFilterLink *outlink = ctx->outputs[0];

  1417.     ShowSpectrumContext *s = ctx->priv;

  1418.     int ret;

  1419. 

  1420.     FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);

  1421. 

  1422.     if (av_audio_fifo_size(s->fifo) < s->win_size) {

  1423.         AVFrame *frame = NULL;

  1424. 

  1425.         ret = ff_inlink_consume_frame(inlink, &frame);

  1426.         if (ret < 0)

  1427.             return ret;

  1428.         if (ret > 0) {

  1429.             s->pts = frame->pts;

  1430.             s->consumed = 0;

  1431. 

  1432.             av_audio_fifo_write(s->fifo, (void **)frame->extended_data, frame->nb_samples);

  1433.             av_frame_free(&frame);

  1434.         }

  1435.     }

  1436. 

  1437.     if (s->outpicref && av_audio_fifo_size(s->fifo) >= s->win_size) {

  1438.         AVFrame *fin = ff_get_audio_buffer(inlink, s->win_size);

  1439.         if (!fin)

  1440.             return AVERROR(ENOMEM);

  1441. 

  1442.         fin->pts = s->pts + s->consumed;

  1443.         s->consumed += s->hop_size;

  1444.         ret = av_audio_fifo_peek(s->fifo, (void **)fin->extended_data,

  1445.                                  FFMIN(s->win_size, av_audio_fifo_size(s->fifo)));

  1446.         if (ret < 0) {

  1447.             av_frame_free(&fin);

  1448.             return ret;

  1449.         }

  1450. 

  1451.         av_assert0(fin->nb_samples == s->win_size);

  1452. 

  1453.         ctx->internal->execute(ctx, run_channel_fft, fin, NULL, s->nb_display_channels);

  1454. 

  1455.         if (s->data == D_MAGNITUDE)

  1456.             ctx->internal->execute(ctx, calc_channel_magnitudes, NULL, NULL, s->nb_display_channels);

  1457. 

  1458.         if (s->data == D_PHASE)

  1459.             ctx->internal->execute(ctx, calc_channel_phases, NULL, NULL, s->nb_display_channels);

  1460. 

  1461.         ret = plot_spectrum_column(inlink, fin);

  1462. 

  1463.         av_frame_free(&fin);

  1464.         av_audio_fifo_drain(s->fifo, s->hop_size);

  1465.         if (ret <= 0)

  1466.             return ret;

  1467.     }

  1468. 

  1469.     if (ff_outlink_get_status(inlink) == AVERROR_EOF &&

  1470.         s->sliding == FULLFRAME &&

  1471.         s->xpos > 0 && s->outpicref) {

  1472.         int64_t pts;

  1473. 

  1474.         if (s->orientation == VERTICAL) {

  1475.             for (int i = 0; i < outlink->h; i++) {

  1476.                 memset(s->outpicref->data[0] + i * s->outpicref->linesize[0] + s->xpos,   0, outlink->w - s->xpos);

  1477.                 memset(s->outpicref->data[1] + i * s->outpicref->linesize[1] + s->xpos, 128, outlink->w - s->xpos);

  1478.                 memset(s->outpicref->data[2] + i * s->outpicref->linesize[2] + s->xpos, 128, outlink->w - s->xpos);

  1479.             }

  1480.         } else {

  1481.             for (int i = s->xpos; i < outlink->h; i++) {

  1482.                 memset(s->outpicref->data[0] + i * s->outpicref->linesize[0],   0, outlink->w);

  1483.                 memset(s->outpicref->data[1] + i * s->outpicref->linesize[1], 128, outlink->w);

  1484.                 memset(s->outpicref->data[2] + i * s->outpicref->linesize[2], 128, outlink->w);

  1485.             }

  1486.         }

  1487.         s->outpicref->pts += s->consumed;

  1488.         pts = s->outpicref->pts;

  1489.         ret = ff_filter_frame(outlink, s->outpicref);

  1490.         s->outpicref = NULL;

  1491.         ff_outlink_set_status(outlink, AVERROR_EOF, pts);

  1492.         return 0;

  1493.     }

  1494. 

  1495.     FF_FILTER_FORWARD_STATUS(inlink, outlink);

  1496.     if (ff_outlink_frame_wanted(outlink) && av_audio_fifo_size(s->fifo) < s->win_size) {

  1497.         ff_inlink_request_frame(inlink);

  1498.         return 0;

  1499.     }

  1500. 

  1501.     if (av_audio_fifo_size(s->fifo) >= s->win_size) {

  1502.         ff_filter_set_ready(ctx, 10);

  1503.         return 0;

  1504.     }

  1505.     return FFERROR_NOT_READY;

  1506. }

  1507. 

  1508. static const AVFilterPad showspectrum_inputs[] = {

  1509.     {

  1510.         .name         = "default",

  1511.         .type         = AVMEDIA_TYPE_AUDIO,

  1512.     },

  1513.     { NULL }

  1514. };

  1515. 

  1516. static const AVFilterPad showspectrum_outputs[] = {

  1517.     {

  1518.         .name          = "default",

  1519.         .type          = AVMEDIA_TYPE_VIDEO,

  1520.         .config_props  = config_output,

  1521.     },

  1522.     { NULL }

  1523. };

  1524. 

  1525. AVFilter ff_avf_showspectrum = {

  1526.     .name          = "showspectrum",

  1527.     .description   = NULL_IF_CONFIG_SMALL("Convert input audio to a spectrum video output."),

  1528.     .uninit        = uninit,

  1529.     .query_formats = query_formats,

  1530.     .priv_size     = sizeof(ShowSpectrumContext),

  1531.     .inputs        = showspectrum_inputs,

  1532.     .outputs       = showspectrum_outputs,

  1533.     .activate      = activate,

  1534.     .priv_class    = &showspectrum_class,

  1535.     .flags         = AVFILTER_FLAG_SLICE_THREADS,

  1536. };

  1537. #endif // CONFIG_SHOWSPECTRUM_FILTER

  1538. 

  1539. #if CONFIG_SHOWSPECTRUMPIC_FILTER

  1540. 

  1541. static const AVOption showspectrumpic_options[] = {

  1542.     { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "4096x2048"}, 0, 0, FLAGS },

  1543.     { "s",    "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "4096x2048"}, 0, 0, FLAGS },

  1544.     { "mode", "set channel display mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=COMBINED}, 0, NB_MODES-1, FLAGS, "mode" },

  1545.         { "combined", "combined mode", 0, AV_OPT_TYPE_CONST, {.i64=COMBINED}, 0, 0, FLAGS, "mode" },

  1546.         { "separate", "separate mode", 0, AV_OPT_TYPE_CONST, {.i64=SEPARATE}, 0, 0, FLAGS, "mode" },

  1547.     { "color", "set channel coloring", OFFSET(color_mode), AV_OPT_TYPE_INT, {.i64=INTENSITY}, 0, NB_CLMODES-1, FLAGS, "color" },

  1548.         { "channel",   "separate color for each channel", 0, AV_OPT_TYPE_CONST, {.i64=CHANNEL},   0, 0, FLAGS, "color" },

  1549.         { "intensity", "intensity based coloring",        0, AV_OPT_TYPE_CONST, {.i64=INTENSITY}, 0, 0, FLAGS, "color" },

  1550.         { "rainbow",   "rainbow based coloring",          0, AV_OPT_TYPE_CONST, {.i64=RAINBOW},   0, 0, FLAGS, "color" },

  1551.         { "moreland",  "moreland based coloring",         0, AV_OPT_TYPE_CONST, {.i64=MORELAND},  0, 0, FLAGS, "color" },

  1552.         { "nebulae",   "nebulae based coloring",          0, AV_OPT_TYPE_CONST, {.i64=NEBULAE},   0, 0, FLAGS, "color" },

  1553.         { "fire",      "fire based coloring",             0, AV_OPT_TYPE_CONST, {.i64=FIRE},      0, 0, FLAGS, "color" },

  1554.         { "fiery",     "fiery based coloring",            0, AV_OPT_TYPE_CONST, {.i64=FIERY},     0, 0, FLAGS, "color" },

  1555.         { "fruit",     "fruit based coloring",            0, AV_OPT_TYPE_CONST, {.i64=FRUIT},     0, 0, FLAGS, "color" },

  1556.         { "cool",      "cool based coloring",             0, AV_OPT_TYPE_CONST, {.i64=COOL},      0, 0, FLAGS, "color" },

  1557.         { "magma",     "magma based coloring",            0, AV_OPT_TYPE_CONST, {.i64=MAGMA},     0, 0, FLAGS, "color" },

  1558.         { "green",     "green based coloring",            0, AV_OPT_TYPE_CONST, {.i64=GREEN},     0, 0, FLAGS, "color" },

  1559.         { "viridis",   "viridis based coloring",          0, AV_OPT_TYPE_CONST, {.i64=VIRIDIS},   0, 0, FLAGS, "color" },

  1560.         { "plasma",    "plasma based coloring",           0, AV_OPT_TYPE_CONST, {.i64=PLASMA},    0, 0, FLAGS, "color" },

  1561.         { "cividis",   "cividis based coloring",          0, AV_OPT_TYPE_CONST, {.i64=CIVIDIS},   0, 0, FLAGS, "color" },

  1562.         { "terrain",   "terrain based coloring",          0, AV_OPT_TYPE_CONST, {.i64=TERRAIN},   0, 0, FLAGS, "color" },

  1563.     { "scale", "set display scale", OFFSET(scale), AV_OPT_TYPE_INT, {.i64=LOG}, 0, NB_SCALES-1, FLAGS, "scale" },

  1564.         { "lin",  "linear",      0, AV_OPT_TYPE_CONST, {.i64=LINEAR}, 0, 0, FLAGS, "scale" },

  1565.         { "sqrt", "square root", 0, AV_OPT_TYPE_CONST, {.i64=SQRT},   0, 0, FLAGS, "scale" },

  1566.         { "cbrt", "cubic root",  0, AV_OPT_TYPE_CONST, {.i64=CBRT},   0, 0, FLAGS, "scale" },

  1567.         { "log",  "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=LOG},    0, 0, FLAGS, "scale" },

  1568.         { "4thrt","4th root",    0, AV_OPT_TYPE_CONST, {.i64=FOURTHRT}, 0, 0, FLAGS, "scale" },

  1569.         { "5thrt","5th root",    0, AV_OPT_TYPE_CONST, {.i64=FIFTHRT},  0, 0, FLAGS, "scale" },

  1570.     { "fscale", "set frequency scale", OFFSET(fscale), AV_OPT_TYPE_INT, {.i64=F_LINEAR}, 0, NB_FSCALES-1, FLAGS, "fscale" },

  1571.         { "lin",  "linear",      0, AV_OPT_TYPE_CONST, {.i64=F_LINEAR}, 0, 0, FLAGS, "fscale" },

  1572.         { "log",  "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=F_LOG},    0, 0, FLAGS, "fscale" },

  1573.     { "saturation", "color saturation multiplier", OFFSET(saturation), AV_OPT_TYPE_FLOAT, {.dbl = 1}, -10, 10, FLAGS },

  1574.     { "win_func", "set window function", OFFSET(win_func), AV_OPT_TYPE_INT, {.i64 = WFUNC_HANNING}, 0, NB_WFUNC-1, FLAGS, "win_func" },

  1575.         { "rect",     "Rectangular",      0, AV_OPT_TYPE_CONST, {.i64=WFUNC_RECT},     0, 0, FLAGS, "win_func" },

  1576.         { "bartlett", "Bartlett",         0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BARTLETT}, 0, 0, FLAGS, "win_func" },

  1577.         { "hann",     "Hann",             0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HANNING},  0, 0, FLAGS, "win_func" },

  1578.         { "hanning",  "Hanning",          0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HANNING},  0, 0, FLAGS, "win_func" },

  1579.         { "hamming",  "Hamming",          0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HAMMING},  0, 0, FLAGS, "win_func" },

  1580.         { "blackman", "Blackman",         0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BLACKMAN}, 0, 0, FLAGS, "win_func" },

  1581.         { "welch",    "Welch",            0, AV_OPT_TYPE_CONST, {.i64=WFUNC_WELCH},    0, 0, FLAGS, "win_func" },

  1582.         { "flattop",  "Flat-top",         0, AV_OPT_TYPE_CONST, {.i64=WFUNC_FLATTOP},  0, 0, FLAGS, "win_func" },

  1583.         { "bharris",  "Blackman-Harris",  0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHARRIS},  0, 0, FLAGS, "win_func" },

  1584.         { "bnuttall", "Blackman-Nuttall", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BNUTTALL}, 0, 0, FLAGS, "win_func" },

  1585.         { "bhann",    "Bartlett-Hann",    0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHANN},    0, 0, FLAGS, "win_func" },

  1586.         { "sine",     "Sine",             0, AV_OPT_TYPE_CONST, {.i64=WFUNC_SINE},     0, 0, FLAGS, "win_func" },

  1587.         { "nuttall",  "Nuttall",          0, AV_OPT_TYPE_CONST, {.i64=WFUNC_NUTTALL},  0, 0, FLAGS, "win_func" },

  1588.         { "lanczos",  "Lanczos",          0, AV_OPT_TYPE_CONST, {.i64=WFUNC_LANCZOS},  0, 0, FLAGS, "win_func" },

  1589.         { "gauss",    "Gauss",            0, AV_OPT_TYPE_CONST, {.i64=WFUNC_GAUSS},    0, 0, FLAGS, "win_func" },

  1590.         { "tukey",    "Tukey",            0, AV_OPT_TYPE_CONST, {.i64=WFUNC_TUKEY},    0, 0, FLAGS, "win_func" },

  1591.         { "dolph",    "Dolph-Chebyshev",  0, AV_OPT_TYPE_CONST, {.i64=WFUNC_DOLPH},    0, 0, FLAGS, "win_func" },

  1592.         { "cauchy",   "Cauchy",           0, AV_OPT_TYPE_CONST, {.i64=WFUNC_CAUCHY},   0, 0, FLAGS, "win_func" },

  1593.         { "parzen",   "Parzen",           0, AV_OPT_TYPE_CONST, {.i64=WFUNC_PARZEN},   0, 0, FLAGS, "win_func" },

  1594.         { "poisson",  "Poisson",          0, AV_OPT_TYPE_CONST, {.i64=WFUNC_POISSON},  0, 0, FLAGS, "win_func" },

  1595.         { "bohman",   "Bohman",           0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BOHMAN},   0, 0, FLAGS, "win_func" },

  1596.     { "orientation", "set orientation", OFFSET(orientation), AV_OPT_TYPE_INT, {.i64=VERTICAL}, 0, NB_ORIENTATIONS-1, FLAGS, "orientation" },

  1597.         { "vertical",   NULL, 0, AV_OPT_TYPE_CONST, {.i64=VERTICAL},   0, 0, FLAGS, "orientation" },

  1598.         { "horizontal", NULL, 0, AV_OPT_TYPE_CONST, {.i64=HORIZONTAL}, 0, 0, FLAGS, "orientation" },

  1599.     { "gain", "set scale gain", OFFSET(gain), AV_OPT_TYPE_FLOAT, {.dbl = 1}, 0, 128, FLAGS },

  1600.     { "legend", "draw legend", OFFSET(legend), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, FLAGS },

  1601.     { "rotation", "color rotation", OFFSET(rotation), AV_OPT_TYPE_FLOAT, {.dbl = 0}, -1, 1, FLAGS },

  1602.     { "start", "start frequency", OFFSET(start), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT32_MAX, FLAGS },

  1603.     { "stop",  "stop frequency",  OFFSET(stop),  AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT32_MAX, FLAGS },

  1604.     { NULL }

  1605. };

  1606. 

  1607. AVFILTER_DEFINE_CLASS(showspectrumpic);

  1608. 

  1609. static int showspectrumpic_request_frame(AVFilterLink *outlink)

  1610. {

  1611.     AVFilterContext *ctx = outlink->src;

  1612.     ShowSpectrumContext *s = ctx->priv;

  1613.     AVFilterLink *inlink = ctx->inputs[0];

  1614.     int ret, samples;

  1615. 

  1616.     ret = ff_request_frame(inlink);

  1617.     samples = av_audio_fifo_size(s->fifo);

  1618.     if (ret == AVERROR_EOF && s->outpicref && samples > 0) {

  1619.         int consumed = 0;

  1620.         int x = 0, sz = s->orientation == VERTICAL ? s->w : s->h;

  1621.         int ch, spf, spb;

  1622.         AVFrame *fin;

  1623. 

  1624.         spf = s->win_size * (samples / ((s->win_size * sz) * ceil(samples / (float)(s->win_size * sz))));

  1625.         spf = FFMAX(1, spf);

  1626. 

  1627.         spb = (samples / (spf * sz)) * spf;

  1628. 

  1629.         fin = ff_get_audio_buffer(inlink, s->win_size);

  1630.         if (!fin)

  1631.             return AVERROR(ENOMEM);

  1632. 

  1633.         while (x < sz) {

  1634.             ret = av_audio_fifo_peek(s->fifo, (void **)fin->extended_data, s->win_size);

  1635.             if (ret < 0) {

  1636.                 av_frame_free(&fin);

  1637.                 return ret;

  1638.             }

  1639. 

  1640.             av_audio_fifo_drain(s->fifo, spf);

  1641. 

  1642.             if (ret < s->win_size) {

  1643.                 for (ch = 0; ch < s->nb_display_channels; ch++) {

  1644.                     memset(fin->extended_data[ch] + ret * sizeof(float), 0,

  1645.                            (s->win_size - ret) * sizeof(float));

  1646.                 }

  1647.             }

  1648. 

  1649.             ctx->internal->execute(ctx, run_channel_fft, fin, NULL, s->nb_display_channels);

  1650.             acalc_magnitudes(s);

  1651. 

  1652.             consumed += spf;

  1653.             if (consumed >= spb) {

  1654.                 int h = s->orientation == VERTICAL ? s->h : s->w;

  1655. 

  1656.                 scale_magnitudes(s, 1.f / (consumed / spf));

  1657.                 plot_spectrum_column(inlink, fin);

  1658.                 consumed = 0;

  1659.                 x++;

  1660.                 for (ch = 0; ch < s->nb_display_channels; ch++)

  1661.                     memset(s->magnitudes[ch], 0, h * sizeof(float));

  1662.             }

  1663.         }

  1664. 

  1665.         av_frame_free(&fin);

  1666.         s->outpicref->pts = 0;

  1667. 

  1668.         if (s->legend)

  1669.             draw_legend(ctx, samples);

  1670. 

  1671.         ret = ff_filter_frame(outlink, s->outpicref);

  1672.         s->outpicref = NULL;

  1673.     }

  1674. 

  1675.     return ret;

  1676. }

  1677. 

  1678. static int showspectrumpic_filter_frame(AVFilterLink *inlink, AVFrame *insamples)

  1679. {

  1680.     AVFilterContext *ctx = inlink->dst;

  1681.     ShowSpectrumContext *s = ctx->priv;

  1682.     int ret;

  1683. 

  1684.     ret = av_audio_fifo_write(s->fifo, (void **)insamples->extended_data, insamples->nb_samples);

  1685.     av_frame_free(&insamples);

  1686.     return ret;

  1687. }

  1688. 

  1689. static const AVFilterPad showspectrumpic_inputs[] = {

  1690.     {

  1691.         .name         = "default",

  1692.         .type         = AVMEDIA_TYPE_AUDIO,

  1693.         .filter_frame = showspectrumpic_filter_frame,

  1694.     },

  1695.     { NULL }

  1696. };

  1697. 

  1698. static const AVFilterPad showspectrumpic_outputs[] = {

  1699.     {

  1700.         .name          = "default",

  1701.         .type          = AVMEDIA_TYPE_VIDEO,

  1702.         .config_props  = config_output,

  1703.         .request_frame = showspectrumpic_request_frame,

  1704.     },

  1705.     { NULL }

  1706. };

  1707. 

  1708. AVFilter ff_avf_showspectrumpic = {

  1709.     .name          = "showspectrumpic",

  1710.     .description   = NULL_IF_CONFIG_SMALL("Convert input audio to a spectrum video output single picture."),

  1711.     .uninit        = uninit,

  1712.     .query_formats = query_formats,

  1713.     .priv_size     = sizeof(ShowSpectrumContext),

  1714.     .inputs        = showspectrumpic_inputs,

  1715.     .outputs       = showspectrumpic_outputs,

  1716.     .priv_class    = &showspectrumpic_class,

  1717.     .flags         = AVFILTER_FLAG_SLICE_THREADS,

  1718. };

  1719. 

  1720. #endif // CONFIG_SHOWSPECTRUMPIC_FILTER