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

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

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

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

  52. 

  53. typedef struct ShowSpectrumContext {

  54.     const AVClass *class;

  55.     int w, h;

  56.     char *rate_str;

  57.     AVRational auto_frame_rate;

  58.     AVRational frame_rate;

  59.     AVFrame *outpicref;

  60.     int nb_display_channels;

  61.     int orientation;

  62.     int channel_width;

  63.     int channel_height;

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

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

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

  67.     int scale;

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

  69.     float rotation;             ///< color rotation

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

  71.     int data;

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

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

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

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

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

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

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

  79.     float **magnitudes;

  80.     float **phases;

  81.     int win_func;

  82.     int win_size;

  83.     int buf_size;

  84.     double win_scale;

  85.     float overlap;

  86.     float gain;

  87.     int consumed;

  88.     int hop_size;

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

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

  91.     AVAudioFifo *fifo;

  92.     int64_t pts;

  93.     int64_t old_pts;

  94.     int old_len;

  95.     int single_pic;

  96.     int legend;

  97.     int start_x, start_y;

  98. } ShowSpectrumContext;

  99. 

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

  101. #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

  102. 

  103. static const AVOption showspectrum_options[] = {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  135.         { "4thrt","4th root",    0, AV_OPT_TYPE_CONST, {.i64=FOURTHRT}, 0, 0, FLAGS, "scale" },

  136.         { "5thrt","5th root",    0, AV_OPT_TYPE_CONST, {.i64=FIFTHRT},  0, 0, FLAGS, "scale" },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  173.     { NULL }

  174. };

  175. 

  176. AVFILTER_DEFINE_CLASS(showspectrum);

  177. 

  178. static const struct ColorTable {

  179.     float a, y, u, v;

  180. } color_table[][8] = {

  181.     [INTENSITY] = {

  182.     {    0,                  0,                  0,                   0 },

  183.     { 0.13, .03587126228984074,  .1573300977624594, -.02548747583751842 },

  184.     { 0.30, .18572281794568020,  .1772436246393981,  .17475554840414750 },

  185.     { 0.60, .28184980583656130, -.1593064119945782,  .47132074554608920 },

  186.     { 0.73, .65830621175547810, -.3716070802232764,  .24352759331252930 },

  187.     { 0.78, .76318535758242900, -.4307467689263783,  .16866496622310430 },

  188.     { 0.91, .95336363636363640, -.2045454545454546,  .03313636363636363 },

  189.     {    1,                  1,                  0,                   0 }},

  190.     [RAINBOW] = {

  191.     {    0,                  0,                  0,                   0 },

  192.     { 0.13,            44/256.,     (189-128)/256.,      (138-128)/256. },

  193.     { 0.25,            29/256.,     (186-128)/256.,      (119-128)/256. },

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

  195.     { 0.60,           111/256.,      (73-128)/256.,       (59-128)/256. },

  196.     { 0.73,           205/256.,      (19-128)/256.,      (149-128)/256. },

  197.     { 0.86,           135/256.,      (83-128)/256.,      (200-128)/256. },

  198.     {    1,            73/256.,      (95-128)/256.,      (225-128)/256. }},

  199.     [MORELAND] = {

  200.     {    0,            44/256.,     (181-128)/256.,      (112-128)/256. },

  201.     { 0.13,           126/256.,     (177-128)/256.,      (106-128)/256. },

  202.     { 0.25,           164/256.,     (163-128)/256.,      (109-128)/256. },

  203.     { 0.38,           200/256.,     (140-128)/256.,      (120-128)/256. },

  204.     { 0.60,           201/256.,     (117-128)/256.,      (141-128)/256. },

  205.     { 0.73,           177/256.,     (103-128)/256.,      (165-128)/256. },

  206.     { 0.86,           136/256.,     (100-128)/256.,      (183-128)/256. },

  207.     {    1,            68/256.,     (117-128)/256.,      (203-128)/256. }},

  208.     [NEBULAE] = {

  209.     {    0,            10/256.,     (134-128)/256.,      (132-128)/256. },

  210.     { 0.23,            21/256.,     (137-128)/256.,      (130-128)/256. },

  211.     { 0.45,            35/256.,     (134-128)/256.,      (134-128)/256. },

  212.     { 0.57,            51/256.,     (130-128)/256.,      (139-128)/256. },

  213.     { 0.67,           104/256.,     (116-128)/256.,      (162-128)/256. },

  214.     { 0.77,           120/256.,     (105-128)/256.,      (188-128)/256. },

  215.     { 0.87,           140/256.,     (105-128)/256.,      (188-128)/256. },

  216.     {    1,                  1,                  0,                   0 }},

  217.     [FIRE] = {

  218.     {    0,                  0,                  0,                   0 },

  219.     { 0.23,            44/256.,     (132-128)/256.,      (127-128)/256. },

  220.     { 0.45,            62/256.,     (116-128)/256.,      (140-128)/256. },

  221.     { 0.57,            75/256.,     (105-128)/256.,      (152-128)/256. },

  222.     { 0.67,            95/256.,      (91-128)/256.,      (166-128)/256. },

  223.     { 0.77,           126/256.,      (74-128)/256.,      (172-128)/256. },

  224.     { 0.87,           164/256.,      (73-128)/256.,      (162-128)/256. },

  225.     {    1,                  1,                  0,                   0 }},

  226.     [FIERY] = {

  227.     {    0,                  0,                  0,                   0 },

  228.     { 0.23,            36/256.,     (116-128)/256.,      (163-128)/256. },

  229.     { 0.45,            52/256.,     (102-128)/256.,      (200-128)/256. },

  230.     { 0.57,           116/256.,      (84-128)/256.,      (196-128)/256. },

  231.     { 0.67,           157/256.,      (67-128)/256.,      (181-128)/256. },

  232.     { 0.77,           193/256.,      (40-128)/256.,      (155-128)/256. },

  233.     { 0.87,           221/256.,     (101-128)/256.,      (134-128)/256. },

  234.     {    1,                  1,                  0,                   0 }},

  235.     [FRUIT] = {

  236.     {    0,                  0,                  0,                   0 },

  237.     { 0.20,            29/256.,     (136-128)/256.,      (119-128)/256. },

  238.     { 0.30,            60/256.,     (119-128)/256.,       (90-128)/256. },

  239.     { 0.40,            85/256.,      (91-128)/256.,       (85-128)/256. },

  240.     { 0.50,           116/256.,      (70-128)/256.,      (105-128)/256. },

  241.     { 0.60,           151/256.,      (50-128)/256.,      (146-128)/256. },

  242.     { 0.70,           191/256.,      (63-128)/256.,      (178-128)/256. },

  243.     {    1,            98/256.,      (80-128)/256.,      (221-128)/256. }},

  244.     [COOL] = {

  245.     {    0,                  0,                  0,                   0 },

  246.     {  .15,                  0,                 .5,                 -.5 },

  247.     {    1,                  1,                -.5,                  .5 }},

  248.     [MAGMA] = {

  249.     {    0,                  0,                  0,                   0 },

  250.     { 0.10,            23/256.,     (175-128)/256.,      (120-128)/256. },

  251.     { 0.23,            43/256.,     (158-128)/256.,      (144-128)/256. },

  252.     { 0.35,            85/256.,     (138-128)/256.,      (179-128)/256. },

  253.     { 0.48,            96/256.,     (128-128)/256.,      (189-128)/256. },

  254.     { 0.64,           128/256.,     (103-128)/256.,      (214-128)/256. },

  255.     { 0.92,           205/256.,      (80-128)/256.,      (152-128)/256. },

  256.     {    1,                  1,                  0,                   0 }},

  257.     [GREEN] = {

  258.     {    0,                  0,                  0,                   0 },

  259.     {  .75,                 .5,                  0,                 -.5 },

  260.     {    1,                  1,                  0,                   0 }},

  261.     [VIRIDIS] = {

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

  263.     { 0.10,          0x39/255.,   (0x9D -128)/255.,    (0x8F -128)/255. },

  264.     { 0.23,          0x5C/255.,   (0x9A -128)/255.,    (0x68 -128)/255. },

  265.     { 0.35,          0x69/255.,   (0x93 -128)/255.,    (0x57 -128)/255. },

  266.     { 0.48,          0x76/255.,   (0x88 -128)/255.,    (0x4B -128)/255. },

  267.     { 0.64,          0x8A/255.,   (0x72 -128)/255.,    (0x4F -128)/255. },

  268.     { 0.80,          0xA3/255.,   (0x50 -128)/255.,    (0x66 -128)/255. },

  269.     {    1,          0xCC/255.,   (0x2F -128)/255.,    (0x87 -128)/255. }},

  270.     [PLASMA] = {

  271.     {    0,                  0,                  0,                   0 },

  272.     { 0.10,          0x27/255.,   (0xC2 -128)/255.,    (0x82 -128)/255. },

  273.     { 0.58,          0x5B/255.,   (0x9A -128)/255.,    (0xAE -128)/255. },

  274.     { 0.70,          0x89/255.,   (0x44 -128)/255.,    (0xAB -128)/255. },

  275.     { 0.80,          0xB4/255.,   (0x2B -128)/255.,    (0x9E -128)/255. },

  276.     { 0.91,          0xD2/255.,   (0x38 -128)/255.,    (0x92 -128)/255. },

  277.     {    1,                  1,                  0,                  0. }},

  278.     [CIVIDIS] = {

  279.     {    0,                  0,                  0,                   0 },

  280.     { 0.20,          0x28/255.,   (0x98 -128)/255.,    (0x6F -128)/255. },

  281.     { 0.50,          0x48/255.,   (0x95 -128)/255.,    (0x74 -128)/255. },

  282.     { 0.63,          0x69/255.,   (0x84 -128)/255.,    (0x7F -128)/255. },

  283.     { 0.76,          0x89/255.,   (0x75 -128)/255.,    (0x84 -128)/255. },

  284.     { 0.90,          0xCE/255.,   (0x35 -128)/255.,    (0x95 -128)/255. },

  285.     {    1,                  1,                  0,                  0. }},

  286.     [TERRAIN] = {

  287.     {    0,                  0,                  0,                   0 },

  288.     { 0.15,                  0,                 .5,                   0 },

  289.     { 0.60,                  1,                -.5,                 -.5 },

  290.     { 0.85,                  1,                -.5,                  .5 },

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

  292. };

  293. 

  294. static av_cold void uninit(AVFilterContext *ctx)

  295. {

  296.     ShowSpectrumContext *s = ctx->priv;

  297.     int i;

  298. 

  299.     av_freep(&s->combine_buffer);

  300.     if (s->fft) {

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

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

  303.     }

  304.     av_freep(&s->fft);

  305.     if (s->ifft) {

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

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

  308.     }

  309.     av_freep(&s->ifft);

  310.     if (s->fft_data) {

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

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

  313.     }

  314.     av_freep(&s->fft_data);

  315.     if (s->fft_scratch) {

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

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

  318.     }

  319.     av_freep(&s->fft_scratch);

  320.     if (s->color_buffer) {

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

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

  323.     }

  324.     av_freep(&s->color_buffer);

  325.     av_freep(&s->window_func_lut);

  326.     if (s->magnitudes) {

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

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

  329.     }

  330.     av_freep(&s->magnitudes);

  331.     av_frame_free(&s->outpicref);

  332.     av_audio_fifo_free(s->fifo);

  333.     if (s->phases) {

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

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

  336.     }

  337.     av_freep(&s->phases);

  338. }

  339. 

  340. static int query_formats(AVFilterContext *ctx)

  341. {

  342.     AVFilterFormats *formats = NULL;

  343.     AVFilterChannelLayouts *layouts = NULL;

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

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

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

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

  348.     int ret;

  349. 

  350.     /* set input audio formats */

  351.     formats = ff_make_format_list(sample_fmts);

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

  353.         return ret;

  354. 

  355.     layouts = ff_all_channel_layouts();

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

  357.         return ret;

  358. 

  359.     formats = ff_all_samplerates();

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

  361.         return ret;

  362. 

  363.     /* set output video format */

  364.     formats = ff_make_format_list(pix_fmts);

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

  366.         return ret;

  367. 

  368.     return 0;

  369. }

  370. 

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

  372. {

  373.     ShowSpectrumContext *s = ctx->priv;

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

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

  376.     AVFrame *fin = arg;

  377.     const int ch = jobnr;

  378.     int n;

  379. 

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

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

  382. 

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

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

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

  386.     }

  387. 

  388.     if (s->stop) {

  389.         double theta, phi, psi, a, b, S, c;

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

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

  392.         int L = s->buf_size;

  393.         int N = s->win_size;

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

  395. 

  396.         phi = 2.0 * M_PI * (s->stop - s->start) / (double)inlink->sample_rate / (M - 1);

  397.         theta = 2.0 * M_PI * s->start / (double)inlink->sample_rate;

  398. 

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

  400.             h[n].re = cos(n * n / 2.0 * phi);

  401.             h[n].im = sin(n * n / 2.0 * phi);

  402.         }

  403. 

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

  405.             h[n].re = 0.0;

  406.             h[n].im = 0.0;

  407.         }

  408. 

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

  410.             h[n].re = cos((L - n) * (L - n) / 2.0 * phi);

  411.             h[n].im = sin((L - n) * (L - n) / 2.0 * phi);

  412.         }

  413. 

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

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

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

  417.         }

  418. 

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

  420.             g[n].re = 0.;

  421.             g[n].im = 0.;

  422.         }

  423. 

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

  425.             psi = n * theta + n * n / 2.0 * phi;

  426.             c =  cos(psi);

  427.             S = -sin(psi);

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

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

  430.             g[n].re = a;

  431.             g[n].im = b;

  432.         }

  433. 

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

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

  436. 

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

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

  439. 

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

  441.             c = g[n].re;

  442.             S = g[n].im;

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

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

  445. 

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

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

  448.         }

  449. 

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

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

  452. 

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

  454.             psi = k * k / 2.0 * phi;

  455.             c =  cos(psi);

  456.             S = -sin(psi);

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

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

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

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

  461.         }

  462.     } else {

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

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

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

  466.     }

  467. 

  468.     return 0;

  469. }

  470. 

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

  472. {

  473.     const uint8_t *font;

  474.     int font_height;

  475.     int i;

  476. 

  477.     font = avpriv_cga_font,   font_height =  8;

  478. 

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

  480.         int char_y, mask;

  481. 

  482.         if (o) {

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

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

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

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

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

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

  489.                 }

  490.             }

  491.         } else {

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

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

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

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

  496.                         *p = ~(*p);

  497.                     p++;

  498.                 }

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

  500.             }

  501.         }

  502.     }

  503. }

  504. 

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

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

  507. {

  508.     switch (s->mode) {

  509.     case COMBINED:

  510.         // reduce range by channel count

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

  512.         switch (s->color_mode) {

  513.         case RAINBOW:

  514.         case MORELAND:

  515.         case NEBULAE:

  516.         case FIRE:

  517.         case FIERY:

  518.         case FRUIT:

  519.         case COOL:

  520.         case GREEN:

  521.         case VIRIDIS:

  522.         case PLASMA:

  523.         case CIVIDIS:

  524.         case TERRAIN:

  525.         case MAGMA:

  526.         case INTENSITY:

  527.             *uf = *yf;

  528.             *vf = *yf;

  529.             break;

  530.         case CHANNEL:

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

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

  533.             *uf = *yf * M_PI;

  534.             *vf = *yf * M_PI;

  535.             break;

  536.         default:

  537.             av_assert0(0);

  538.         }

  539.         break;

  540.     case SEPARATE:

  541.         // full range

  542.         *yf = 256.0f;

  543.         *uf = 256.0f;

  544.         *vf = 256.0f;

  545.         break;

  546.     default:

  547.         av_assert0(0);

  548.     }

  549. 

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

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

  552.             *uf *= 0.5 * sin((2 * M_PI * ch) / s->nb_display_channels + M_PI * s->rotation);

  553.             *vf *= 0.5 * cos((2 * M_PI * ch) / s->nb_display_channels + M_PI * s->rotation);

  554.         } else {

  555.             *uf *= 0.5 * sin(M_PI * s->rotation);

  556.             *vf *= 0.5 * cos(M_PI * s->rotation + M_PI_2);

  557.         }

  558.     } else {

  559.         *uf += *uf * sin(M_PI * s->rotation);

  560.         *vf += *vf * cos(M_PI * s->rotation + M_PI_2);

  561.     }

  562. 

  563.     *uf *= s->saturation;

  564.     *vf *= s->saturation;

  565. }

  566. 

  567. static void pick_color(ShowSpectrumContext *s,

  568.                        float yf, float uf, float vf,

  569.                        float a, float *out)

  570. {

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

  572.         const int cm = s->color_mode;

  573.         float y, u, v;

  574.         int i;

  575. 

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

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

  578.                 break;

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

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

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

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

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

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

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

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

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

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

  589.         } else {

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

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

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

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

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

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

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

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

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

  599.         }

  600. 

  601.         out[0] = y * yf;

  602.         out[1] = u * uf;

  603.         out[2] = v * vf;

  604.     } else {

  605.         out[0] = a * yf;

  606.         out[1] = a * uf;

  607.         out[2] = a * vf;

  608.     }

  609. }

  610. 

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

  612. {

  613.     char *units;

  614. 

  615.     if (x == 0)

  616.         units = av_asprintf("0");

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

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

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

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

  621.     else

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

  623.     return units;

  624. }

  625. 

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

  627. {

  628.     ShowSpectrumContext *s = ctx->priv;

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

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

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

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

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

  634.     char *text;

  635.     uint8_t *dst;

  636.     char chlayout_str[128];

  637. 

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

  639.                                  inlink->channel_layout);

  640. 

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

  642. 

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

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

  645.     if (s->stop) {

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

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

  648.         av_freep(&text);

  649.     }

  650. 

  651.     av_freep(&text);

  652. 

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

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

  655.         dst[x] = 200;

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

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

  658.         dst[x] = 200;

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

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

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

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

  663.     }

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

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

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

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

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

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

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

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

  672.             }

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

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

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

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

  677.             }

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

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

  680.                 dst[x] = 200;

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

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

  683.                 dst[x] = 200;

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

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

  686.                 dst[x] = 200;

  687.             }

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

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

  690.                 dst[x] = 200;

  691.             }

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

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

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

  695.                 char *units;

  696. 

  697.                 if (hertz == 0)

  698.                     units = av_asprintf("DC");

  699.                 else

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

  701.                 if (!units)

  702.                     return AVERROR(ENOMEM);

  703. 

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

  705.                 av_free(units);

  706.             }

  707.         }

  708. 

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

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

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

  712. 

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

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

  715.             av_free(units);

  716.         }

  717. 

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

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

  720.     } else {

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

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

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

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

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

  726.         }

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

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

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

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

  731.         }

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

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

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

  735.                 dst[x] = 200;

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

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

  738.                 dst[x] = 200;

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

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

  741.                 dst[x] = 200;

  742.             }

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

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

  745.                 dst[x] = 200;

  746.             }

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

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

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

  750.                 char *units;

  751. 

  752.                 if (hertz == 0)

  753.                     units = av_asprintf("DC");

  754.                 else

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

  756.                 if (!units)

  757.                     return AVERROR(ENOMEM);

  758. 

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

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

  761.                 av_free(units);

  762.             }

  763.         }

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

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

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

  767. 

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

  769.             av_free(units);

  770.         }

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

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

  773.     }

  774. 

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

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

  777. 

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

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

  780.             int chn;

  781. 

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

  783.                 float yf, uf, vf;

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

  785.                 float lout[3];

  786. 

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

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

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

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

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

  792.             }

  793.             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);

  794.             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);

  795.             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);

  796.         }

  797. 

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

  799.             float value = 120.0 * log10(1. - y / (float)h);

  800.             char *text;

  801. 

  802.             if (value < -120)

  803.                 break;

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

  805.             if (!text)

  806.                 continue;

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

  808.             av_free(text);

  809.         }

  810.     }

  811. 

  812.     return 0;

  813. }

  814. 

  815. static int config_output(AVFilterLink *outlink)

  816. {

  817.     AVFilterContext *ctx = outlink->src;

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

  819.     ShowSpectrumContext *s = ctx->priv;

  820.     int i, fft_bits, h, w;

  821.     float overlap;

  822. 

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

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

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

  826.         return AVERROR(EINVAL);

  827.     }

  828. 

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

  830.         s->single_pic = 1;

  831. 

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

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

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

  835. 

  836.     if (s->legend) {

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

  838.         s->start_y = 64;

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

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

  841.     }

  842. 

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

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

  845.     s->channel_height = h;

  846.     s->channel_width  = w;

  847. 

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

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

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

  851.     } else {

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

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

  854.     }

  855. 

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

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

  858. 

  859.     if (!s->fft) {

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

  861.         if (!s->fft)

  862.             return AVERROR(ENOMEM);

  863.     }

  864. 

  865.     if (s->stop) {

  866.         if (!s->ifft) {

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

  868.             if (!s->ifft)

  869.                 return AVERROR(ENOMEM);

  870.         }

  871.     }

  872. 

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

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

  875.         AVFrame *outpicref;

  876. 

  877.         s->fft_bits = fft_bits;

  878. 

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

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

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

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

  883.             if (s->stop) {

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

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

  886.             }

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

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

  889.         }

  890.         av_freep(&s->fft_data);

  891. 

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

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

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

  895.             if (s->stop) {

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

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

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

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

  900.                     return AVERROR(EINVAL);

  901.                 }

  902.             }

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

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

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

  906.                 return AVERROR(EINVAL);

  907.             }

  908.         }

  909. 

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

  911.         if (!s->magnitudes)

  912.             return AVERROR(ENOMEM);

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

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

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

  916.                 return AVERROR(ENOMEM);

  917.         }

  918. 

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

  920.         if (!s->phases)

  921.             return AVERROR(ENOMEM);

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

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

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

  925.                 return AVERROR(ENOMEM);

  926.         }

  927. 

  928.         av_freep(&s->color_buffer);

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

  930.         if (!s->color_buffer)

  931.             return AVERROR(ENOMEM);

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

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

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

  935.                 return AVERROR(ENOMEM);

  936.         }

  937. 

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

  939.         if (!s->fft_data)

  940.             return AVERROR(ENOMEM);

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

  942.         if (!s->fft_scratch)

  943.             return AVERROR(ENOMEM);

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

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

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

  947.                 return AVERROR(ENOMEM);

  948. 

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

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

  951.                 return AVERROR(ENOMEM);

  952.         }

  953. 

  954.         /* pre-calc windowing function */

  955.         s->window_func_lut =

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

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

  958.         if (!s->window_func_lut)

  959.             return AVERROR(ENOMEM);

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

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

  962.             s->overlap = overlap;

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

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

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

  966.             return AVERROR(EINVAL);

  967.         }

  968. 

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

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

  971.         }

  972.         s->win_scale = 1. / sqrt(s->win_scale);

  973. 

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

  975.         av_frame_free(&s->outpicref);

  976.         s->outpicref = outpicref =

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

  978.         if (!outpicref)

  979.             return AVERROR(ENOMEM);

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

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

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

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

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

  985.         }

  986.         outpicref->color_range = AVCOL_RANGE_JPEG;

  987. 

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

  989.             draw_legend(ctx, 0);

  990.     }

  991. 

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

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

  994.         s->xpos = 0;

  995. 

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

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

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

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

  1000.         s->auto_frame_rate.den *= s->h;

  1001.     if (!s->single_pic && strcmp(s->rate_str, "auto")) {

  1002.         int ret = av_parse_video_rate(&s->frame_rate, s->rate_str);

  1003.         if (ret < 0)

  1004.             return ret;

  1005.     } else {

  1006.         s->frame_rate = s->auto_frame_rate;

  1007.     }

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

  1009.     outlink->time_base = av_inv_q(outlink->frame_rate);

  1010. 

  1011.     if (s->orientation == VERTICAL) {

  1012.         s->combine_buffer =

  1013.             av_realloc_f(s->combine_buffer, s->h * 3,

  1014.                          sizeof(*s->combine_buffer));

  1015.     } else {

  1016.         s->combine_buffer =

  1017.             av_realloc_f(s->combine_buffer, s->w * 3,

  1018.                          sizeof(*s->combine_buffer));

  1019.     }

  1020. 

  1021.     av_log(ctx, AV_LOG_VERBOSE, "s:%dx%d FFT window size:%d\n",

  1022.            s->w, s->h, s->win_size);

  1023. 

  1024.     av_audio_fifo_free(s->fifo);

  1025.     s->fifo = av_audio_fifo_alloc(inlink->format, inlink->channels, s->win_size);

  1026.     if (!s->fifo)

  1027.         return AVERROR(ENOMEM);

  1028.     return 0;

  1029. }

  1030. 

  1031. #define RE(y, ch) s->fft_data[ch][y].re

  1032. #define IM(y, ch) s->fft_data[ch][y].im

  1033. #define MAGNITUDE(y, ch) hypot(RE(y, ch), IM(y, ch))

  1034. #define PHASE(y, ch) atan2(IM(y, ch), RE(y, ch))

  1035. 

  1036. static int calc_channel_magnitudes(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)

  1037. {

  1038.     ShowSpectrumContext *s = ctx->priv;

  1039.     const double w = s->win_scale * (s->scale == LOG ? s->win_scale : 1);

  1040.     int y, h = s->orientation == VERTICAL ? s->h : s->w;

  1041.     const float f = s->gain * w;

  1042.     const int ch = jobnr;

  1043.     float *magnitudes = s->magnitudes[ch];

  1044. 

  1045.     for (y = 0; y < h; y++)

  1046.         magnitudes[y] = MAGNITUDE(y, ch) * f;

  1047. 

  1048.     return 0;

  1049. }

  1050. 

  1051. static int calc_channel_phases(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)

  1052. {

  1053.     ShowSpectrumContext *s = ctx->priv;

  1054.     const int h = s->orientation == VERTICAL ? s->h : s->w;

  1055.     const int ch = jobnr;

  1056.     float *phases = s->phases[ch];

  1057.     int y;

  1058. 

  1059.     for (y = 0; y < h; y++)

  1060.         phases[y] = (PHASE(y, ch) / M_PI + 1) / 2;

  1061. 

  1062.     return 0;

  1063. }

  1064. 

  1065. static void acalc_magnitudes(ShowSpectrumContext *s)

  1066. {

  1067.     const double w = s->win_scale * (s->scale == LOG ? s->win_scale : 1);

  1068.     int ch, y, h = s->orientation == VERTICAL ? s->h : s->w;

  1069.     const float f = s->gain * w;

  1070. 

  1071.     for (ch = 0; ch < s->nb_display_channels; ch++) {

  1072.         float *magnitudes = s->magnitudes[ch];

  1073. 

  1074.         for (y = 0; y < h; y++)

  1075.             magnitudes[y] += MAGNITUDE(y, ch) * f;

  1076.     }

  1077. }

  1078. 

  1079. static void scale_magnitudes(ShowSpectrumContext *s, float scale)

  1080. {

  1081.     int ch, y, h = s->orientation == VERTICAL ? s->h : s->w;

  1082. 

  1083.     for (ch = 0; ch < s->nb_display_channels; ch++) {

  1084.         float *magnitudes = s->magnitudes[ch];

  1085. 

  1086.         for (y = 0; y < h; y++)

  1087.             magnitudes[y] *= scale;

  1088.     }

  1089. }

  1090. 

  1091. static void clear_combine_buffer(ShowSpectrumContext *s, int size)

  1092. {

  1093.     int y;

  1094. 

  1095.     for (y = 0; y < size; y++) {

  1096.         s->combine_buffer[3 * y    ] = 0;

  1097.         s->combine_buffer[3 * y + 1] = 127.5;

  1098.         s->combine_buffer[3 * y + 2] = 127.5;

  1099.     }

  1100. }

  1101. 

  1102. static int plot_channel(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)

  1103. {

  1104.     ShowSpectrumContext *s = ctx->priv;

  1105.     const int h = s->orientation == VERTICAL ? s->channel_height : s->channel_width;

  1106.     const int ch = jobnr;

  1107.     float *magnitudes = s->magnitudes[ch];

  1108.     float *phases = s->phases[ch];

  1109.     float yf, uf, vf;

  1110.     int y;

  1111. 

  1112.     /* decide color range */

  1113.     color_range(s, ch, &yf, &uf, &vf);

  1114. 

  1115.     /* draw the channel */

  1116.     for (y = 0; y < h; y++) {

  1117.         int row = (s->mode == COMBINED) ? y : ch * h + y;

  1118.         float *out = &s->color_buffer[ch][3 * row];

  1119.         float a;

  1120. 

  1121.         switch (s->data) {

  1122.         case D_MAGNITUDE:

  1123.             /* get magnitude */

  1124.             a = magnitudes[y];

  1125.             break;

  1126.         case D_PHASE:

  1127.             /* get phase */

  1128.             a = phases[y];

  1129.             break;

  1130.         default:

  1131.             av_assert0(0);

  1132.         }

  1133. 

  1134.         /* apply scale */

  1135.         switch (s->scale) {

  1136.         case LINEAR:

  1137.             a = av_clipf(a, 0, 1);

  1138.             break;

  1139.         case SQRT:

  1140.             a = av_clipf(sqrt(a), 0, 1);

  1141.             break;

  1142.         case CBRT:

  1143.             a = av_clipf(cbrt(a), 0, 1);

  1144.             break;

  1145.         case FOURTHRT:

  1146.             a = av_clipf(sqrt(sqrt(a)), 0, 1);

  1147.             break;

  1148.         case FIFTHRT:

  1149.             a = av_clipf(pow(a, 0.20), 0, 1);

  1150.             break;

  1151.         case LOG:

  1152.             a = 1 + log10(av_clipd(a, 1e-6, 1)) / 6; // zero = -120dBFS

  1153.             break;

  1154.         default:

  1155.             av_assert0(0);

  1156.         }

  1157. 

  1158.         pick_color(s, yf, uf, vf, a, out);

  1159.     }

  1160. 

  1161.     return 0;

  1162. }

  1163. 

  1164. static int plot_spectrum_column(AVFilterLink *inlink, AVFrame *insamples)

  1165. {

  1166.     AVFilterContext *ctx = inlink->dst;

  1167.     AVFilterLink *outlink = ctx->outputs[0];

  1168.     ShowSpectrumContext *s = ctx->priv;

  1169.     AVFrame *outpicref = s->outpicref;

  1170.     int ret, plane, x, y, z = s->orientation == VERTICAL ? s->h : s->w;

  1171. 

  1172.     /* fill a new spectrum column */

  1173.     /* initialize buffer for combining to black */

  1174.     clear_combine_buffer(s, z);

  1175. 

  1176.     ctx->internal->execute(ctx, plot_channel, NULL, NULL, s->nb_display_channels);

  1177. 

  1178.     for (y = 0; y < z * 3; y++) {

  1179.         for (x = 0; x < s->nb_display_channels; x++) {

  1180.             s->combine_buffer[y] += s->color_buffer[x][y];

  1181.         }

  1182.     }

  1183. 

  1184.     av_frame_make_writable(s->outpicref);

  1185.     /* copy to output */

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

  1187.         if (s->sliding == SCROLL) {

  1188.             for (plane = 0; plane < 3; plane++) {

  1189.                 for (y = 0; y < s->h; y++) {

  1190.                     uint8_t *p = outpicref->data[plane] + s->start_x +

  1191.                                  (y + s->start_y) * outpicref->linesize[plane];

  1192.                     memmove(p, p + 1, s->w - 1);

  1193.                 }

  1194.             }

  1195.             s->xpos = s->w - 1;

  1196.         } else if (s->sliding == RSCROLL) {

  1197.             for (plane = 0; plane < 3; plane++) {

  1198.                 for (y = 0; y < s->h; y++) {

  1199.                     uint8_t *p = outpicref->data[plane] + s->start_x +

  1200.                                  (y + s->start_y) * outpicref->linesize[plane];

  1201.                     memmove(p + 1, p, s->w - 1);

  1202.                 }

  1203.             }

  1204.             s->xpos = 0;

  1205.         }

  1206.         for (plane = 0; plane < 3; plane++) {

  1207.             uint8_t *p = outpicref->data[plane] + s->start_x +

  1208.                          (outlink->h - 1 - s->start_y) * outpicref->linesize[plane] +

  1209.                          s->xpos;

  1210.             for (y = 0; y < s->h; y++) {

  1211.                 *p = lrintf(av_clipf(s->combine_buffer[3 * y + plane], 0, 255));

  1212.                 p -= outpicref->linesize[plane];

  1213.             }

  1214.         }

  1215.     } else {

  1216.         if (s->sliding == SCROLL) {

  1217.             for (plane = 0; plane < 3; plane++) {

  1218.                 for (y = 1; y < s->h; y++) {

  1219.                     memmove(outpicref->data[plane] + (y-1 + s->start_y) * outpicref->linesize[plane] + s->start_x,

  1220.                             outpicref->data[plane] + (y   + s->start_y) * outpicref->linesize[plane] + s->start_x,

  1221.                             s->w);

  1222.                 }

  1223.             }

  1224.             s->xpos = s->h - 1;

  1225.         } else if (s->sliding == RSCROLL) {

  1226.             for (plane = 0; plane < 3; plane++) {

  1227.                 for (y = s->h - 1; y >= 1; y--) {

  1228.                     memmove(outpicref->data[plane] + (y   + s->start_y) * outpicref->linesize[plane] + s->start_x,

  1229.                             outpicref->data[plane] + (y-1 + s->start_y) * outpicref->linesize[plane] + s->start_x,

  1230.                             s->w);

  1231.                 }

  1232.             }

  1233.             s->xpos = 0;

  1234.         }

  1235.         for (plane = 0; plane < 3; plane++) {

  1236.             uint8_t *p = outpicref->data[plane] + s->start_x +

  1237.                          (s->xpos + s->start_y) * outpicref->linesize[plane];

  1238.             for (x = 0; x < s->w; x++) {

  1239.                 *p = lrintf(av_clipf(s->combine_buffer[3 * x + plane], 0, 255));

  1240.                 p++;

  1241.             }

  1242.         }

  1243.     }

  1244. 

  1245.     if (s->sliding != FULLFRAME || s->xpos == 0)

  1246.         outpicref->pts = av_rescale_q(insamples->pts, inlink->time_base, outlink->time_base);

  1247. 

  1248.     s->xpos++;

  1249.     if (s->orientation == VERTICAL && s->xpos >= s->w)

  1250.         s->xpos = 0;

  1251.     if (s->orientation == HORIZONTAL && s->xpos >= s->h)

  1252.         s->xpos = 0;

  1253.     if (!s->single_pic && (s->sliding != FULLFRAME || s->xpos == 0)) {

  1254.         if (s->old_pts < outpicref->pts) {

  1255.             if (s->legend) {

  1256.                 char *units = get_time(ctx, insamples->pts /(float)inlink->sample_rate, x);

  1257. 

  1258.                 if (s->orientation == VERTICAL) {

  1259.                     for (y = 0; y < 10; y++) {

  1260.                         memset(s->outpicref->data[0] + outlink->w / 2 - 4 * s->old_len +

  1261.                                (outlink->h - s->start_y / 2 - 20 + y) * s->outpicref->linesize[0], 0, 10 * s->old_len);

  1262.                     }

  1263.                     drawtext(s->outpicref,

  1264.                              outlink->w / 2 - 4 * strlen(units),

  1265.                              outlink->h - s->start_y / 2 - 20,

  1266.                              units, 0);

  1267.                 } else  {

  1268.                     for (y = 0; y < 10 * s->old_len; y++) {

  1269.                         memset(s->outpicref->data[0] + s->start_x / 7 + 20 +

  1270.                                (outlink->h / 2 - 4 * s->old_len + y) * s->outpicref->linesize[0], 0, 10);

  1271.                     }

  1272.                     drawtext(s->outpicref,

  1273.                              s->start_x / 7 + 20,

  1274.                              outlink->h / 2 - 4 * strlen(units),

  1275.                              units, 1);

  1276.                 }

  1277.                 s->old_len = strlen(units);

  1278.                 av_free(units);

  1279.             }

  1280.             s->old_pts = outpicref->pts;

  1281.             ret = ff_filter_frame(outlink, av_frame_clone(s->outpicref));

  1282.             if (ret < 0)

  1283.                 return ret;

  1284.             return 0;

  1285.         }

  1286.     }

  1287. 

  1288.     return 1;

  1289. }

  1290. 

  1291. #if CONFIG_SHOWSPECTRUM_FILTER

  1292. 

  1293. static int activate(AVFilterContext *ctx)

  1294. {

  1295.     AVFilterLink *inlink = ctx->inputs[0];

  1296.     AVFilterLink *outlink = ctx->outputs[0];

  1297.     ShowSpectrumContext *s = ctx->priv;

  1298.     int ret;

  1299. 

  1300.     FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);

  1301. 

  1302.     if (av_audio_fifo_size(s->fifo) < s->win_size) {

  1303.         AVFrame *frame = NULL;

  1304. 

  1305.         ret = ff_inlink_consume_frame(inlink, &frame);

  1306.         if (ret < 0)

  1307.             return ret;

  1308.         if (ret > 0) {

  1309.             s->pts = frame->pts;

  1310.             s->consumed = 0;

  1311. 

  1312.             av_audio_fifo_write(s->fifo, (void **)frame->extended_data, frame->nb_samples);

  1313.             av_frame_free(&frame);

  1314.         }

  1315.     }

  1316. 

  1317.     if (s->outpicref && av_audio_fifo_size(s->fifo) >= s->win_size) {

  1318.         AVFrame *fin = ff_get_audio_buffer(inlink, s->win_size);

  1319.         if (!fin)

  1320.             return AVERROR(ENOMEM);

  1321. 

  1322.         fin->pts = s->pts + s->consumed;

  1323.         s->consumed += s->hop_size;

  1324.         ret = av_audio_fifo_peek(s->fifo, (void **)fin->extended_data,

  1325.                                  FFMIN(s->win_size, av_audio_fifo_size(s->fifo)));

  1326.         if (ret < 0) {

  1327.             av_frame_free(&fin);

  1328.             return ret;

  1329.         }

  1330. 

  1331.         av_assert0(fin->nb_samples == s->win_size);

  1332. 

  1333.         ctx->internal->execute(ctx, run_channel_fft, fin, NULL, s->nb_display_channels);

  1334. 

  1335.         if (s->data == D_MAGNITUDE)

  1336.             ctx->internal->execute(ctx, calc_channel_magnitudes, NULL, NULL, s->nb_display_channels);

  1337. 

  1338.         if (s->data == D_PHASE)

  1339.             ctx->internal->execute(ctx, calc_channel_phases, NULL, NULL, s->nb_display_channels);

  1340. 

  1341.         ret = plot_spectrum_column(inlink, fin);

  1342. 

  1343.         av_frame_free(&fin);

  1344.         av_audio_fifo_drain(s->fifo, s->hop_size);

  1345.         if (ret <= 0)

  1346.             return ret;

  1347.     }

  1348. 

  1349.     if (ff_outlink_get_status(inlink) == AVERROR_EOF &&

  1350.         s->sliding == FULLFRAME &&

  1351.         s->xpos > 0 && s->outpicref) {

  1352.         int64_t pts;

  1353. 

  1354.         if (s->orientation == VERTICAL) {

  1355.             for (int i = 0; i < outlink->h; i++) {

  1356.                 memset(s->outpicref->data[0] + i * s->outpicref->linesize[0] + s->xpos,   0, outlink->w - s->xpos);

  1357.                 memset(s->outpicref->data[1] + i * s->outpicref->linesize[1] + s->xpos, 128, outlink->w - s->xpos);

  1358.                 memset(s->outpicref->data[2] + i * s->outpicref->linesize[2] + s->xpos, 128, outlink->w - s->xpos);

  1359.             }

  1360.         } else {

  1361.             for (int i = s->xpos; i < outlink->h; i++) {

  1362.                 memset(s->outpicref->data[0] + i * s->outpicref->linesize[0],   0, outlink->w);

  1363.                 memset(s->outpicref->data[1] + i * s->outpicref->linesize[1], 128, outlink->w);

  1364.                 memset(s->outpicref->data[2] + i * s->outpicref->linesize[2], 128, outlink->w);

  1365.             }

  1366.         }

  1367.         s->outpicref->pts += s->consumed;

  1368.         pts = s->outpicref->pts;

  1369.         ret = ff_filter_frame(outlink, s->outpicref);

  1370.         s->outpicref = NULL;

  1371.         ff_outlink_set_status(outlink, AVERROR_EOF, pts);

  1372.         return 0;

  1373.     }

  1374. 

  1375.     FF_FILTER_FORWARD_STATUS(inlink, outlink);

  1376.     if (ff_outlink_frame_wanted(outlink) && av_audio_fifo_size(s->fifo) < s->win_size) {

  1377.         ff_inlink_request_frame(inlink);

  1378.         return 0;

  1379.     }

  1380. 

  1381.     if (av_audio_fifo_size(s->fifo) >= s->win_size) {

  1382.         ff_filter_set_ready(ctx, 10);

  1383.         return 0;

  1384.     }

  1385.     return FFERROR_NOT_READY;

  1386. }

  1387. 

  1388. static const AVFilterPad showspectrum_inputs[] = {

  1389.     {

  1390.         .name         = "default",

  1391.         .type         = AVMEDIA_TYPE_AUDIO,

  1392.     },

  1393.     { NULL }

  1394. };

  1395. 

  1396. static const AVFilterPad showspectrum_outputs[] = {

  1397.     {

  1398.         .name          = "default",

  1399.         .type          = AVMEDIA_TYPE_VIDEO,

  1400.         .config_props  = config_output,

  1401.     },

  1402.     { NULL }

  1403. };

  1404. 

  1405. AVFilter ff_avf_showspectrum = {

  1406.     .name          = "showspectrum",

  1407.     .description   = NULL_IF_CONFIG_SMALL("Convert input audio to a spectrum video output."),

  1408.     .uninit        = uninit,

  1409.     .query_formats = query_formats,

  1410.     .priv_size     = sizeof(ShowSpectrumContext),

  1411.     .inputs        = showspectrum_inputs,

  1412.     .outputs       = showspectrum_outputs,

  1413.     .activate      = activate,

  1414.     .priv_class    = &showspectrum_class,

  1415.     .flags         = AVFILTER_FLAG_SLICE_THREADS,

  1416. };

  1417. #endif // CONFIG_SHOWSPECTRUM_FILTER

  1418. 

  1419. #if CONFIG_SHOWSPECTRUMPIC_FILTER

  1420. 

  1421. static const AVOption showspectrumpic_options[] = {

  1422.     { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "4096x2048"}, 0, 0, FLAGS },

  1423.     { "s",    "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "4096x2048"}, 0, 0, FLAGS },

  1424.     { "mode", "set channel display mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=COMBINED}, 0, NB_MODES-1, FLAGS, "mode" },

  1425.         { "combined", "combined mode", 0, AV_OPT_TYPE_CONST, {.i64=COMBINED}, 0, 0, FLAGS, "mode" },

  1426.         { "separate", "separate mode", 0, AV_OPT_TYPE_CONST, {.i64=SEPARATE}, 0, 0, FLAGS, "mode" },

  1427.     { "color", "set channel coloring", OFFSET(color_mode), AV_OPT_TYPE_INT, {.i64=INTENSITY}, 0, NB_CLMODES-1, FLAGS, "color" },

  1428.         { "channel",   "separate color for each channel", 0, AV_OPT_TYPE_CONST, {.i64=CHANNEL},   0, 0, FLAGS, "color" },

  1429.         { "intensity", "intensity based coloring",        0, AV_OPT_TYPE_CONST, {.i64=INTENSITY}, 0, 0, FLAGS, "color" },

  1430.         { "rainbow",   "rainbow based coloring",          0, AV_OPT_TYPE_CONST, {.i64=RAINBOW},   0, 0, FLAGS, "color" },

  1431.         { "moreland",  "moreland based coloring",         0, AV_OPT_TYPE_CONST, {.i64=MORELAND},  0, 0, FLAGS, "color" },

  1432.         { "nebulae",   "nebulae based coloring",          0, AV_OPT_TYPE_CONST, {.i64=NEBULAE},   0, 0, FLAGS, "color" },

  1433.         { "fire",      "fire based coloring",             0, AV_OPT_TYPE_CONST, {.i64=FIRE},      0, 0, FLAGS, "color" },

  1434.         { "fiery",     "fiery based coloring",            0, AV_OPT_TYPE_CONST, {.i64=FIERY},     0, 0, FLAGS, "color" },

  1435.         { "fruit",     "fruit based coloring",            0, AV_OPT_TYPE_CONST, {.i64=FRUIT},     0, 0, FLAGS, "color" },

  1436.         { "cool",      "cool based coloring",             0, AV_OPT_TYPE_CONST, {.i64=COOL},      0, 0, FLAGS, "color" },

  1437.         { "magma",     "magma based coloring",            0, AV_OPT_TYPE_CONST, {.i64=MAGMA},     0, 0, FLAGS, "color" },

  1438.         { "green",     "green based coloring",            0, AV_OPT_TYPE_CONST, {.i64=GREEN},     0, 0, FLAGS, "color" },

  1439.         { "viridis",   "viridis based coloring",          0, AV_OPT_TYPE_CONST, {.i64=VIRIDIS},   0, 0, FLAGS, "color" },

  1440.         { "plasma",    "plasma based coloring",           0, AV_OPT_TYPE_CONST, {.i64=PLASMA},    0, 0, FLAGS, "color" },

  1441.         { "cividis",   "cividis based coloring",          0, AV_OPT_TYPE_CONST, {.i64=CIVIDIS},   0, 0, FLAGS, "color" },

  1442.         { "terrain",   "terrain based coloring",          0, AV_OPT_TYPE_CONST, {.i64=TERRAIN},   0, 0, FLAGS, "color" },

  1443.     { "scale", "set display scale", OFFSET(scale), AV_OPT_TYPE_INT, {.i64=LOG}, 0, NB_SCALES-1, FLAGS, "scale" },

  1444.         { "lin",  "linear",      0, AV_OPT_TYPE_CONST, {.i64=LINEAR}, 0, 0, FLAGS, "scale" },

  1445.         { "sqrt", "square root", 0, AV_OPT_TYPE_CONST, {.i64=SQRT},   0, 0, FLAGS, "scale" },

  1446.         { "cbrt", "cubic root",  0, AV_OPT_TYPE_CONST, {.i64=CBRT},   0, 0, FLAGS, "scale" },

  1447.         { "log",  "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=LOG},    0, 0, FLAGS, "scale" },

  1448.         { "4thrt","4th root",    0, AV_OPT_TYPE_CONST, {.i64=FOURTHRT}, 0, 0, FLAGS, "scale" },

  1449.         { "5thrt","5th root",    0, AV_OPT_TYPE_CONST, {.i64=FIFTHRT},  0, 0, FLAGS, "scale" },

  1450.     { "saturation", "color saturation multiplier", OFFSET(saturation), AV_OPT_TYPE_FLOAT, {.dbl = 1}, -10, 10, FLAGS },

  1451.     { "win_func", "set window function", OFFSET(win_func), AV_OPT_TYPE_INT, {.i64 = WFUNC_HANNING}, 0, NB_WFUNC-1, FLAGS, "win_func" },

  1452.         { "rect",     "Rectangular",      0, AV_OPT_TYPE_CONST, {.i64=WFUNC_RECT},     0, 0, FLAGS, "win_func" },

  1453.         { "bartlett", "Bartlett",         0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BARTLETT}, 0, 0, FLAGS, "win_func" },

  1454.         { "hann",     "Hann",             0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HANNING},  0, 0, FLAGS, "win_func" },

  1455.         { "hanning",  "Hanning",          0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HANNING},  0, 0, FLAGS, "win_func" },

  1456.         { "hamming",  "Hamming",          0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HAMMING},  0, 0, FLAGS, "win_func" },

  1457.         { "blackman", "Blackman",         0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BLACKMAN}, 0, 0, FLAGS, "win_func" },

  1458.         { "welch",    "Welch",            0, AV_OPT_TYPE_CONST, {.i64=WFUNC_WELCH},    0, 0, FLAGS, "win_func" },

  1459.         { "flattop",  "Flat-top",         0, AV_OPT_TYPE_CONST, {.i64=WFUNC_FLATTOP},  0, 0, FLAGS, "win_func" },

  1460.         { "bharris",  "Blackman-Harris",  0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHARRIS},  0, 0, FLAGS, "win_func" },

  1461.         { "bnuttall", "Blackman-Nuttall", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BNUTTALL}, 0, 0, FLAGS, "win_func" },

  1462.         { "bhann",    "Bartlett-Hann",    0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHANN},    0, 0, FLAGS, "win_func" },

  1463.         { "sine",     "Sine",             0, AV_OPT_TYPE_CONST, {.i64=WFUNC_SINE},     0, 0, FLAGS, "win_func" },

  1464.         { "nuttall",  "Nuttall",          0, AV_OPT_TYPE_CONST, {.i64=WFUNC_NUTTALL},  0, 0, FLAGS, "win_func" },

  1465.         { "lanczos",  "Lanczos",          0, AV_OPT_TYPE_CONST, {.i64=WFUNC_LANCZOS},  0, 0, FLAGS, "win_func" },

  1466.         { "gauss",    "Gauss",            0, AV_OPT_TYPE_CONST, {.i64=WFUNC_GAUSS},    0, 0, FLAGS, "win_func" },

  1467.         { "tukey",    "Tukey",            0, AV_OPT_TYPE_CONST, {.i64=WFUNC_TUKEY},    0, 0, FLAGS, "win_func" },

  1468.         { "dolph",    "Dolph-Chebyshev",  0, AV_OPT_TYPE_CONST, {.i64=WFUNC_DOLPH},    0, 0, FLAGS, "win_func" },

  1469.         { "cauchy",   "Cauchy",           0, AV_OPT_TYPE_CONST, {.i64=WFUNC_CAUCHY},   0, 0, FLAGS, "win_func" },

  1470.         { "parzen",   "Parzen",           0, AV_OPT_TYPE_CONST, {.i64=WFUNC_PARZEN},   0, 0, FLAGS, "win_func" },

  1471.         { "poisson",  "Poisson",          0, AV_OPT_TYPE_CONST, {.i64=WFUNC_POISSON},  0, 0, FLAGS, "win_func" },

  1472.         { "bohman",   "Bohman",           0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BOHMAN},   0, 0, FLAGS, "win_func" },

  1473.     { "orientation", "set orientation", OFFSET(orientation), AV_OPT_TYPE_INT, {.i64=VERTICAL}, 0, NB_ORIENTATIONS-1, FLAGS, "orientation" },

  1474.         { "vertical",   NULL, 0, AV_OPT_TYPE_CONST, {.i64=VERTICAL},   0, 0, FLAGS, "orientation" },

  1475.         { "horizontal", NULL, 0, AV_OPT_TYPE_CONST, {.i64=HORIZONTAL}, 0, 0, FLAGS, "orientation" },

  1476.     { "gain", "set scale gain", OFFSET(gain), AV_OPT_TYPE_FLOAT, {.dbl = 1}, 0, 128, FLAGS },

  1477.     { "legend", "draw legend", OFFSET(legend), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, FLAGS },

  1478.     { "rotation", "color rotation", OFFSET(rotation), AV_OPT_TYPE_FLOAT, {.dbl = 0}, -1, 1, FLAGS },

  1479.     { "start", "start frequency", OFFSET(start), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT32_MAX, FLAGS },

  1480.     { "stop",  "stop frequency",  OFFSET(stop),  AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT32_MAX, FLAGS },

  1481.     { NULL }

  1482. };

  1483. 

  1484. AVFILTER_DEFINE_CLASS(showspectrumpic);

  1485. 

  1486. static int showspectrumpic_request_frame(AVFilterLink *outlink)

  1487. {

  1488.     AVFilterContext *ctx = outlink->src;

  1489.     ShowSpectrumContext *s = ctx->priv;

  1490.     AVFilterLink *inlink = ctx->inputs[0];

  1491.     int ret, samples;

  1492. 

  1493.     ret = ff_request_frame(inlink);

  1494.     samples = av_audio_fifo_size(s->fifo);

  1495.     if (ret == AVERROR_EOF && s->outpicref && samples > 0) {

  1496.         int consumed = 0;

  1497.         int x = 0, sz = s->orientation == VERTICAL ? s->w : s->h;

  1498.         int ch, spf, spb;

  1499.         AVFrame *fin;

  1500. 

  1501.         spf = s->win_size * (samples / ((s->win_size * sz) * ceil(samples / (float)(s->win_size * sz))));

  1502.         spf = FFMAX(1, spf);

  1503. 

  1504.         spb = (samples / (spf * sz)) * spf;

  1505. 

  1506.         fin = ff_get_audio_buffer(inlink, s->win_size);

  1507.         if (!fin)

  1508.             return AVERROR(ENOMEM);

  1509. 

  1510.         while (x < sz) {

  1511.             ret = av_audio_fifo_peek(s->fifo, (void **)fin->extended_data, s->win_size);

  1512.             if (ret < 0) {

  1513.                 av_frame_free(&fin);

  1514.                 return ret;

  1515.             }

  1516. 

  1517.             av_audio_fifo_drain(s->fifo, spf);

  1518. 

  1519.             if (ret < s->win_size) {

  1520.                 for (ch = 0; ch < s->nb_display_channels; ch++) {

  1521.                     memset(fin->extended_data[ch] + ret * sizeof(float), 0,

  1522.                            (s->win_size - ret) * sizeof(float));

  1523.                 }

  1524.             }

  1525. 

  1526.             ctx->internal->execute(ctx, run_channel_fft, fin, NULL, s->nb_display_channels);

  1527.             acalc_magnitudes(s);

  1528. 

  1529.             consumed += spf;

  1530.             if (consumed >= spb) {

  1531.                 int h = s->orientation == VERTICAL ? s->h : s->w;

  1532. 

  1533.                 scale_magnitudes(s, 1. / (consumed / spf));

  1534.                 plot_spectrum_column(inlink, fin);

  1535.                 consumed = 0;

  1536.                 x++;

  1537.                 for (ch = 0; ch < s->nb_display_channels; ch++)

  1538.                     memset(s->magnitudes[ch], 0, h * sizeof(float));

  1539.             }

  1540.         }

  1541. 

  1542.         av_frame_free(&fin);

  1543.         s->outpicref->pts = 0;

  1544. 

  1545.         if (s->legend)

  1546.             draw_legend(ctx, samples);

  1547. 

  1548.         ret = ff_filter_frame(outlink, s->outpicref);

  1549.         s->outpicref = NULL;

  1550.     }

  1551. 

  1552.     return ret;

  1553. }

  1554. 

  1555. static int showspectrumpic_filter_frame(AVFilterLink *inlink, AVFrame *insamples)

  1556. {

  1557.     AVFilterContext *ctx = inlink->dst;

  1558.     ShowSpectrumContext *s = ctx->priv;

  1559.     int ret;

  1560. 

  1561.     ret = av_audio_fifo_write(s->fifo, (void **)insamples->extended_data, insamples->nb_samples);

  1562.     av_frame_free(&insamples);

  1563.     return ret;

  1564. }

  1565. 

  1566. static const AVFilterPad showspectrumpic_inputs[] = {

  1567.     {

  1568.         .name         = "default",

  1569.         .type         = AVMEDIA_TYPE_AUDIO,

  1570.         .filter_frame = showspectrumpic_filter_frame,

  1571.     },

  1572.     { NULL }

  1573. };

  1574. 

  1575. static const AVFilterPad showspectrumpic_outputs[] = {

  1576.     {

  1577.         .name          = "default",

  1578.         .type          = AVMEDIA_TYPE_VIDEO,

  1579.         .config_props  = config_output,

  1580.         .request_frame = showspectrumpic_request_frame,

  1581.     },

  1582.     { NULL }

  1583. };

  1584. 

  1585. AVFilter ff_avf_showspectrumpic = {

  1586.     .name          = "showspectrumpic",

  1587.     .description   = NULL_IF_CONFIG_SMALL("Convert input audio to a spectrum video output single picture."),

  1588.     .uninit        = uninit,

  1589.     .query_formats = query_formats,

  1590.     .priv_size     = sizeof(ShowSpectrumContext),

  1591.     .inputs        = showspectrumpic_inputs,

  1592.     .outputs       = showspectrumpic_outputs,

  1593.     .priv_class    = &showspectrumpic_class,

  1594.     .flags         = AVFILTER_FLAG_SLICE_THREADS,

  1595. };

  1596. 

  1597. #endif // CONFIG_SHOWSPECTRUMPIC_FILTER