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

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

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

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

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

  133.         { "4thrt","4th root",    0, AV_OPT_TYPE_CONST, {.i64=FOURTHRT}, 0, 0, FLAGS, "scale" },

  134.         { "5thrt","5th root",    0, AV_OPT_TYPE_CONST, {.i64=FIFTHRT},  0, 0, FLAGS, "scale" },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  171.     { NULL }

  172. };

  173. 

  174. AVFILTER_DEFINE_CLASS(showspectrum);

  175. 

  176. static const struct ColorTable {

  177.     float a, y, u, v;

  178. } color_table[][8] = {

  179.     [INTENSITY] = {

  180.     {    0,                  0,                  0,                   0 },

  181.     { 0.13, .03587126228984074,  .1573300977624594, -.02548747583751842 },

  182.     { 0.30, .18572281794568020,  .1772436246393981,  .17475554840414750 },

  183.     { 0.60, .28184980583656130, -.1593064119945782,  .47132074554608920 },

  184.     { 0.73, .65830621175547810, -.3716070802232764,  .24352759331252930 },

  185.     { 0.78, .76318535758242900, -.4307467689263783,  .16866496622310430 },

  186.     { 0.91, .95336363636363640, -.2045454545454546,  .03313636363636363 },

  187.     {    1,                  1,                  0,                   0 }},

  188.     [RAINBOW] = {

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

  190.     { 0.13,            44/256.,     (189-128)/256.,      (138-128)/256. },

  191.     { 0.25,            29/256.,     (186-128)/256.,      (119-128)/256. },

  192.     { 0.38,           119/256.,     (194-128)/256.,       (53-128)/256. },

  193.     { 0.60,           111/256.,      (73-128)/256.,       (59-128)/256. },

  194.     { 0.73,           205/256.,      (19-128)/256.,      (149-128)/256. },

  195.     { 0.86,           135/256.,      (83-128)/256.,      (200-128)/256. },

  196.     {    1,            73/256.,      (95-128)/256.,      (225-128)/256. }},

  197.     [MORELAND] = {

  198.     {    0,            44/256.,     (181-128)/256.,      (112-128)/256. },

  199.     { 0.13,           126/256.,     (177-128)/256.,      (106-128)/256. },

  200.     { 0.25,           164/256.,     (163-128)/256.,      (109-128)/256. },

  201.     { 0.38,           200/256.,     (140-128)/256.,      (120-128)/256. },

  202.     { 0.60,           201/256.,     (117-128)/256.,      (141-128)/256. },

  203.     { 0.73,           177/256.,     (103-128)/256.,      (165-128)/256. },

  204.     { 0.86,           136/256.,     (100-128)/256.,      (183-128)/256. },

  205.     {    1,            68/256.,     (117-128)/256.,      (203-128)/256. }},

  206.     [NEBULAE] = {

  207.     {    0,            10/256.,     (134-128)/256.,      (132-128)/256. },

  208.     { 0.23,            21/256.,     (137-128)/256.,      (130-128)/256. },

  209.     { 0.45,            35/256.,     (134-128)/256.,      (134-128)/256. },

  210.     { 0.57,            51/256.,     (130-128)/256.,      (139-128)/256. },

  211.     { 0.67,           104/256.,     (116-128)/256.,      (162-128)/256. },

  212.     { 0.77,           120/256.,     (105-128)/256.,      (188-128)/256. },

  213.     { 0.87,           140/256.,     (105-128)/256.,      (188-128)/256. },

  214.     {    1,                  1,                  0,                   0 }},

  215.     [FIRE] = {

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

  217.     { 0.23,            44/256.,     (132-128)/256.,      (127-128)/256. },

  218.     { 0.45,            62/256.,     (116-128)/256.,      (140-128)/256. },

  219.     { 0.57,            75/256.,     (105-128)/256.,      (152-128)/256. },

  220.     { 0.67,            95/256.,      (91-128)/256.,      (166-128)/256. },

  221.     { 0.77,           126/256.,      (74-128)/256.,      (172-128)/256. },

  222.     { 0.87,           164/256.,      (73-128)/256.,      (162-128)/256. },

  223.     {    1,                  1,                  0,                   0 }},

  224.     [FIERY] = {

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

  226.     { 0.23,            36/256.,     (116-128)/256.,      (163-128)/256. },

  227.     { 0.45,            52/256.,     (102-128)/256.,      (200-128)/256. },

  228.     { 0.57,           116/256.,      (84-128)/256.,      (196-128)/256. },

  229.     { 0.67,           157/256.,      (67-128)/256.,      (181-128)/256. },

  230.     { 0.77,           193/256.,      (40-128)/256.,      (155-128)/256. },

  231.     { 0.87,           221/256.,     (101-128)/256.,      (134-128)/256. },

  232.     {    1,                  1,                  0,                   0 }},

  233.     [FRUIT] = {

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

  235.     { 0.20,            29/256.,     (136-128)/256.,      (119-128)/256. },

  236.     { 0.30,            60/256.,     (119-128)/256.,       (90-128)/256. },

  237.     { 0.40,            85/256.,      (91-128)/256.,       (85-128)/256. },

  238.     { 0.50,           116/256.,      (70-128)/256.,      (105-128)/256. },

  239.     { 0.60,           151/256.,      (50-128)/256.,      (146-128)/256. },

  240.     { 0.70,           191/256.,      (63-128)/256.,      (178-128)/256. },

  241.     {    1,            98/256.,      (80-128)/256.,      (221-128)/256. }},

  242.     [COOL] = {

  243.     {    0,                  0,                  0,                   0 },

  244.     {  .15,                  0,                 .5,                 -.5 },

  245.     {    1,                  1,                -.5,                  .5 }},

  246.     [MAGMA] = {

  247.     {    0,                  0,                  0,                   0 },

  248.     { 0.10,            23/256.,     (175-128)/256.,      (120-128)/256. },

  249.     { 0.23,            43/256.,     (158-128)/256.,      (144-128)/256. },

  250.     { 0.35,            85/256.,     (138-128)/256.,      (179-128)/256. },

  251.     { 0.48,            96/256.,     (128-128)/256.,      (189-128)/256. },

  252.     { 0.64,           128/256.,     (103-128)/256.,      (214-128)/256. },

  253.     { 0.92,           205/256.,      (80-128)/256.,      (152-128)/256. },

  254.     {    1,                  1,                  0,                   0 }},

  255.     [GREEN] = {

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

  257.     {  .75,                 .5,                  0,                 -.5 },

  258.     {    1,                  1,                  0,                   0 }},

  259.     [VIRIDIS] = {

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

  261.     { 0.10,          0x39/255.,   (0x9D -128)/255.,    (0x8F -128)/255. },

  262.     { 0.23,          0x5C/255.,   (0x9A -128)/255.,    (0x68 -128)/255. },

  263.     { 0.35,          0x69/255.,   (0x93 -128)/255.,    (0x57 -128)/255. },

  264.     { 0.48,          0x76/255.,   (0x88 -128)/255.,    (0x4B -128)/255. },

  265.     { 0.64,          0x8A/255.,   (0x72 -128)/255.,    (0x4F -128)/255. },

  266.     { 0.80,          0xA3/255.,   (0x50 -128)/255.,    (0x66 -128)/255. },

  267.     {    1,          0xCC/255.,   (0x2F -128)/255.,    (0x87 -128)/255. }},

  268.     [PLASMA] = {

  269.     {    0,                  0,                  0,                   0 },

  270.     { 0.10,          0x27/255.,   (0xC2 -128)/255.,    (0x82 -128)/255. },

  271.     { 0.58,          0x5B/255.,   (0x9A -128)/255.,    (0xAE -128)/255. },

  272.     { 0.70,          0x89/255.,   (0x44 -128)/255.,    (0xAB -128)/255. },

  273.     { 0.80,          0xB4/255.,   (0x2B -128)/255.,    (0x9E -128)/255. },

  274.     { 0.91,          0xD2/255.,   (0x38 -128)/255.,    (0x92 -128)/255. },

  275.     {    1,                  1,                  0,                  0. }},

  276. };

  277. 

  278. static av_cold void uninit(AVFilterContext *ctx)

  279. {

  280.     ShowSpectrumContext *s = ctx->priv;

  281.     int i;

  282. 

  283.     av_freep(&s->combine_buffer);

  284.     if (s->fft) {

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

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

  287.     }

  288.     av_freep(&s->fft);

  289.     if (s->ifft) {

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

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

  292.     }

  293.     av_freep(&s->ifft);

  294.     if (s->fft_data) {

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

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

  297.     }

  298.     av_freep(&s->fft_data);

  299.     if (s->fft_scratch) {

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

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

  302.     }

  303.     av_freep(&s->fft_scratch);

  304.     if (s->color_buffer) {

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

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

  307.     }

  308.     av_freep(&s->color_buffer);

  309.     av_freep(&s->window_func_lut);

  310.     if (s->magnitudes) {

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

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

  313.     }

  314.     av_freep(&s->magnitudes);

  315.     av_frame_free(&s->outpicref);

  316.     av_audio_fifo_free(s->fifo);

  317.     if (s->phases) {

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

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

  320.     }

  321.     av_freep(&s->phases);

  322. }

  323. 

  324. static int query_formats(AVFilterContext *ctx)

  325. {

  326.     AVFilterFormats *formats = NULL;

  327.     AVFilterChannelLayouts *layouts = NULL;

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

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

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

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

  332.     int ret;

  333. 

  334.     /* set input audio formats */

  335.     formats = ff_make_format_list(sample_fmts);

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

  337.         return ret;

  338. 

  339.     layouts = ff_all_channel_layouts();

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

  341.         return ret;

  342. 

  343.     formats = ff_all_samplerates();

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

  345.         return ret;

  346. 

  347.     /* set output video format */

  348.     formats = ff_make_format_list(pix_fmts);

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

  350.         return ret;

  351. 

  352.     return 0;

  353. }

  354. 

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

  356. {

  357.     ShowSpectrumContext *s = ctx->priv;

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

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

  360.     AVFrame *fin = arg;

  361.     const int ch = jobnr;

  362.     int n;

  363. 

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

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

  366. 

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

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

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

  370.     }

  371. 

  372.     if (s->stop) {

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

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

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

  376.         int L = s->buf_size;

  377.         int N = s->win_size;

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

  379. 

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

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

  382. 

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

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

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

  386.         }

  387. 

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

  389.             h[n].re = 0.0;

  390.             h[n].im = 0.0;

  391.         }

  392. 

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

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

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

  396.         }

  397. 

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

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

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

  401.         }

  402. 

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

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

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

  406.         }

  407. 

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

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

  410.             c =  cos(psi);

  411.             S = -sin(psi);

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

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

  414.             g[n].re = a;

  415.             g[n].im = b;

  416.         }

  417. 

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

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

  420. 

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

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

  423. 

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

  425.             c = g[n].re;

  426.             S = g[n].im;

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

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

  429. 

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

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

  432.         }

  433. 

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

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

  436. 

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

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

  439.             c =  cos(psi);

  440.             S = -sin(psi);

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

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

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

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

  445.         }

  446.     } else {

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

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

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

  450.     }

  451. 

  452.     return 0;

  453. }

  454. 

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

  456. {

  457.     const uint8_t *font;

  458.     int font_height;

  459.     int i;

  460. 

  461.     font = avpriv_cga_font,   font_height =  8;

  462. 

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

  464.         int char_y, mask;

  465. 

  466.         if (o) {

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

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

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

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

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

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

  473.                 }

  474.             }

  475.         } else {

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

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

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

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

  480.                         *p = ~(*p);

  481.                     p++;

  482.                 }

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

  484.             }

  485.         }

  486.     }

  487. }

  488. 

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

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

  491. {

  492.     switch (s->mode) {

  493.     case COMBINED:

  494.         // reduce range by channel count

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

  496.         switch (s->color_mode) {

  497.         case RAINBOW:

  498.         case MORELAND:

  499.         case NEBULAE:

  500.         case FIRE:

  501.         case FIERY:

  502.         case FRUIT:

  503.         case COOL:

  504.         case GREEN:

  505.         case VIRIDIS:

  506.         case PLASMA:

  507.         case MAGMA:

  508.         case INTENSITY:

  509.             *uf = *yf;

  510.             *vf = *yf;

  511.             break;

  512.         case CHANNEL:

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

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

  515.             *uf = *yf * M_PI;

  516.             *vf = *yf * M_PI;

  517.             break;

  518.         default:

  519.             av_assert0(0);

  520.         }

  521.         break;

  522.     case SEPARATE:

  523.         // full range

  524.         *yf = 256.0f;

  525.         *uf = 256.0f;

  526.         *vf = 256.0f;

  527.         break;

  528.     default:

  529.         av_assert0(0);

  530.     }

  531. 

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

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

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

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

  536.         } else {

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

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

  539.         }

  540.     } else {

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

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

  543.     }

  544. 

  545.     *uf *= s->saturation;

  546.     *vf *= s->saturation;

  547. }

  548. 

  549. static void pick_color(ShowSpectrumContext *s,

  550.                        float yf, float uf, float vf,

  551.                        float a, float *out)

  552. {

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

  554.         const int cm = s->color_mode;

  555.         float y, u, v;

  556.         int i;

  557. 

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

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

  560.                 break;

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

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

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

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

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

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

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

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

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

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

  571.         } else {

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

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

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

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

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

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

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

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

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

  581.         }

  582. 

  583.         out[0] = y * yf;

  584.         out[1] = u * uf;

  585.         out[2] = v * vf;

  586.     } else {

  587.         out[0] = a * yf;

  588.         out[1] = a * uf;

  589.         out[2] = a * vf;

  590.     }

  591. }

  592. 

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

  594. {

  595.     char *units;

  596. 

  597.     if (x == 0)

  598.         units = av_asprintf("0");

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

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

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

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

  603.     else

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

  605.     return units;

  606. }

  607. 

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

  609. {

  610.     ShowSpectrumContext *s = ctx->priv;

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

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

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

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

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

  616.     char *text;

  617.     uint8_t *dst;

  618.     char chlayout_str[128];

  619. 

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

  621.                                  inlink->channel_layout);

  622. 

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

  624. 

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

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

  627.     if (s->stop) {

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

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

  630.         av_freep(&text);

  631.     }

  632. 

  633.     av_freep(&text);

  634. 

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

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

  637.         dst[x] = 200;

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

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

  640.         dst[x] = 200;

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

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

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

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

  645.     }

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

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

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

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

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

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

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

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

  654.             }

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

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

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

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

  659.             }

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

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

  662.                 dst[x] = 200;

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

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

  665.                 dst[x] = 200;

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

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

  668.                 dst[x] = 200;

  669.             }

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

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

  672.                 dst[x] = 200;

  673.             }

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

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

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

  677.                 char *units;

  678. 

  679.                 if (hertz == 0)

  680.                     units = av_asprintf("DC");

  681.                 else

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

  683.                 if (!units)

  684.                     return AVERROR(ENOMEM);

  685. 

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

  687.                 av_free(units);

  688.             }

  689.         }

  690. 

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

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

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

  694. 

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

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

  697.             av_free(units);

  698.         }

  699. 

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

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

  702.     } else {

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

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

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

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

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

  708.         }

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

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

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

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

  713.         }

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

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

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

  717.                 dst[x] = 200;

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

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

  720.                 dst[x] = 200;

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

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

  723.                 dst[x] = 200;

  724.             }

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

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

  727.                 dst[x] = 200;

  728.             }

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

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

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

  732.                 char *units;

  733. 

  734.                 if (hertz == 0)

  735.                     units = av_asprintf("DC");

  736.                 else

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

  738.                 if (!units)

  739.                     return AVERROR(ENOMEM);

  740. 

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

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

  743.                 av_free(units);

  744.             }

  745.         }

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

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

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

  749. 

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

  751.             av_free(units);

  752.         }

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

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

  755.     }

  756. 

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

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

  759. 

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

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

  762.             int chn;

  763. 

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

  765.                 float yf, uf, vf;

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

  767.                 float lout[3];

  768. 

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

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

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

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

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

  774.             }

  775.             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);

  776.             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);

  777.             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);

  778.         }

  779. 

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

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

  782.             char *text;

  783. 

  784.             if (value < -120)

  785.                 break;

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

  787.             if (!text)

  788.                 continue;

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

  790.             av_free(text);

  791.         }

  792.     }

  793. 

  794.     return 0;

  795. }

  796. 

  797. static int config_output(AVFilterLink *outlink)

  798. {

  799.     AVFilterContext *ctx = outlink->src;

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

  801.     ShowSpectrumContext *s = ctx->priv;

  802.     int i, fft_bits, h, w;

  803.     float overlap;

  804. 

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

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

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

  808.         return AVERROR(EINVAL);

  809.     }

  810. 

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

  812.         s->single_pic = 1;

  813. 

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

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

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

  817. 

  818.     if (s->legend) {

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

  820.         s->start_y = 64;

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

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

  823.     }

  824. 

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

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

  827.     s->channel_height = h;

  828.     s->channel_width  = w;

  829. 

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

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

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

  833.     } else {

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

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

  836.     }

  837. 

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

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

  840. 

  841.     if (!s->fft) {

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

  843.         if (!s->fft)

  844.             return AVERROR(ENOMEM);

  845.     }

  846. 

  847.     if (s->stop) {

  848.         if (!s->ifft) {

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

  850.             if (!s->ifft)

  851.                 return AVERROR(ENOMEM);

  852.         }

  853.     }

  854. 

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

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

  857.         AVFrame *outpicref;

  858. 

  859.         s->fft_bits = fft_bits;

  860. 

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

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

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

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

  865.             if (s->stop) {

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

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

  868.             }

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

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

  871.         }

  872.         av_freep(&s->fft_data);

  873. 

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

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

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

  877.             if (s->stop) {

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

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

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

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

  882.                     return AVERROR(EINVAL);

  883.                 }

  884.             }

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

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

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

  888.                 return AVERROR(EINVAL);

  889.             }

  890.         }

  891. 

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

  893.         if (!s->magnitudes)

  894.             return AVERROR(ENOMEM);

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

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

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

  898.                 return AVERROR(ENOMEM);

  899.         }

  900. 

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

  902.         if (!s->phases)

  903.             return AVERROR(ENOMEM);

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

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

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

  907.                 return AVERROR(ENOMEM);

  908.         }

  909. 

  910.         av_freep(&s->color_buffer);

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

  912.         if (!s->color_buffer)

  913.             return AVERROR(ENOMEM);

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

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

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

  917.                 return AVERROR(ENOMEM);

  918.         }

  919. 

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

  921.         if (!s->fft_data)

  922.             return AVERROR(ENOMEM);

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

  924.         if (!s->fft_scratch)

  925.             return AVERROR(ENOMEM);

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

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

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

  929.                 return AVERROR(ENOMEM);

  930. 

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

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

  933.                 return AVERROR(ENOMEM);

  934.         }

  935. 

  936.         /* pre-calc windowing function */

  937.         s->window_func_lut =

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

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

  940.         if (!s->window_func_lut)

  941.             return AVERROR(ENOMEM);

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

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

  944.             s->overlap = overlap;

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

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

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

  948.             return AVERROR(EINVAL);

  949.         }

  950. 

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

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

  953.         }

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

  955. 

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

  957.         av_frame_free(&s->outpicref);

  958.         s->outpicref = outpicref =

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

  960.         if (!outpicref)

  961.             return AVERROR(ENOMEM);

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

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

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

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

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

  967.         }

  968.         outpicref->color_range = AVCOL_RANGE_JPEG;

  969. 

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

  971.             draw_legend(ctx, 0);

  972.     }

  973. 

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

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

  976.         s->xpos = 0;

  977. 

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

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

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

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

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

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

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

  985.         if (ret < 0)

  986.             return ret;

  987.     } else {

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

  989.     }

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

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

  992. 

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

  994.         s->combine_buffer =

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

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

  997.     } else {

  998.         s->combine_buffer =

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

  1000.                          sizeof(*s->combine_buffer));

  1001.     }

  1002. 

  1003.     av_log(ctx, AV_LOG_VERBOSE, "s:%dx%d FFT window size:%d\n",

  1004.            s->w, s->h, s->win_size);

  1005. 

  1006.     av_audio_fifo_free(s->fifo);

  1007.     s->fifo = av_audio_fifo_alloc(inlink->format, inlink->channels, s->win_size);

  1008.     if (!s->fifo)

  1009.         return AVERROR(ENOMEM);

  1010.     return 0;

  1011. }

  1012. 

  1013. #define RE(y, ch) s->fft_data[ch][y].re

  1014. #define IM(y, ch) s->fft_data[ch][y].im

  1015. #define MAGNITUDE(y, ch) hypot(RE(y, ch), IM(y, ch))

  1016. #define PHASE(y, ch) atan2(IM(y, ch), RE(y, ch))

  1017. 

  1018. static int calc_channel_magnitudes(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)

  1019. {

  1020.     ShowSpectrumContext *s = ctx->priv;

  1021.     const double w = s->win_scale * (s->scale == LOG ? s->win_scale : 1);

  1022.     int y, h = s->orientation == VERTICAL ? s->h : s->w;

  1023.     const float f = s->gain * w;

  1024.     const int ch = jobnr;

  1025.     float *magnitudes = s->magnitudes[ch];

  1026. 

  1027.     for (y = 0; y < h; y++)

  1028.         magnitudes[y] = MAGNITUDE(y, ch) * f;

  1029. 

  1030.     return 0;

  1031. }

  1032. 

  1033. static int calc_channel_phases(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)

  1034. {

  1035.     ShowSpectrumContext *s = ctx->priv;

  1036.     const int h = s->orientation == VERTICAL ? s->h : s->w;

  1037.     const int ch = jobnr;

  1038.     float *phases = s->phases[ch];

  1039.     int y;

  1040. 

  1041.     for (y = 0; y < h; y++)

  1042.         phases[y] = (PHASE(y, ch) / M_PI + 1) / 2;

  1043. 

  1044.     return 0;

  1045. }

  1046. 

  1047. static void acalc_magnitudes(ShowSpectrumContext *s)

  1048. {

  1049.     const double w = s->win_scale * (s->scale == LOG ? s->win_scale : 1);

  1050.     int ch, y, h = s->orientation == VERTICAL ? s->h : s->w;

  1051.     const float f = s->gain * w;

  1052. 

  1053.     for (ch = 0; ch < s->nb_display_channels; ch++) {

  1054.         float *magnitudes = s->magnitudes[ch];

  1055. 

  1056.         for (y = 0; y < h; y++)

  1057.             magnitudes[y] += MAGNITUDE(y, ch) * f;

  1058.     }

  1059. }

  1060. 

  1061. static void scale_magnitudes(ShowSpectrumContext *s, float scale)

  1062. {

  1063.     int ch, y, h = s->orientation == VERTICAL ? s->h : s->w;

  1064. 

  1065.     for (ch = 0; ch < s->nb_display_channels; ch++) {

  1066.         float *magnitudes = s->magnitudes[ch];

  1067. 

  1068.         for (y = 0; y < h; y++)

  1069.             magnitudes[y] *= scale;

  1070.     }

  1071. }

  1072. 

  1073. static void clear_combine_buffer(ShowSpectrumContext *s, int size)

  1074. {

  1075.     int y;

  1076. 

  1077.     for (y = 0; y < size; y++) {

  1078.         s->combine_buffer[3 * y    ] = 0;

  1079.         s->combine_buffer[3 * y + 1] = 127.5;

  1080.         s->combine_buffer[3 * y + 2] = 127.5;

  1081.     }

  1082. }

  1083. 

  1084. static int plot_channel(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)

  1085. {

  1086.     ShowSpectrumContext *s = ctx->priv;

  1087.     const int h = s->orientation == VERTICAL ? s->channel_height : s->channel_width;

  1088.     const int ch = jobnr;

  1089.     float *magnitudes = s->magnitudes[ch];

  1090.     float *phases = s->phases[ch];

  1091.     float yf, uf, vf;

  1092.     int y;

  1093. 

  1094.     /* decide color range */

  1095.     color_range(s, ch, &yf, &uf, &vf);

  1096. 

  1097.     /* draw the channel */

  1098.     for (y = 0; y < h; y++) {

  1099.         int row = (s->mode == COMBINED) ? y : ch * h + y;

  1100.         float *out = &s->color_buffer[ch][3 * row];

  1101.         float a;

  1102. 

  1103.         switch (s->data) {

  1104.         case D_MAGNITUDE:

  1105.             /* get magnitude */

  1106.             a = magnitudes[y];

  1107.             break;

  1108.         case D_PHASE:

  1109.             /* get phase */

  1110.             a = phases[y];

  1111.             break;

  1112.         default:

  1113.             av_assert0(0);

  1114.         }

  1115. 

  1116.         /* apply scale */

  1117.         switch (s->scale) {

  1118.         case LINEAR:

  1119.             a = av_clipf(a, 0, 1);

  1120.             break;

  1121.         case SQRT:

  1122.             a = av_clipf(sqrt(a), 0, 1);

  1123.             break;

  1124.         case CBRT:

  1125.             a = av_clipf(cbrt(a), 0, 1);

  1126.             break;

  1127.         case FOURTHRT:

  1128.             a = av_clipf(sqrt(sqrt(a)), 0, 1);

  1129.             break;

  1130.         case FIFTHRT:

  1131.             a = av_clipf(pow(a, 0.20), 0, 1);

  1132.             break;

  1133.         case LOG:

  1134.             a = 1 + log10(av_clipd(a, 1e-6, 1)) / 6; // zero = -120dBFS

  1135.             break;

  1136.         default:

  1137.             av_assert0(0);

  1138.         }

  1139. 

  1140.         pick_color(s, yf, uf, vf, a, out);

  1141.     }

  1142. 

  1143.     return 0;

  1144. }

  1145. 

  1146. static int plot_spectrum_column(AVFilterLink *inlink, AVFrame *insamples)

  1147. {

  1148.     AVFilterContext *ctx = inlink->dst;

  1149.     AVFilterLink *outlink = ctx->outputs[0];

  1150.     ShowSpectrumContext *s = ctx->priv;

  1151.     AVFrame *outpicref = s->outpicref;

  1152.     int ret, plane, x, y, z = s->orientation == VERTICAL ? s->h : s->w;

  1153. 

  1154.     /* fill a new spectrum column */

  1155.     /* initialize buffer for combining to black */

  1156.     clear_combine_buffer(s, z);

  1157. 

  1158.     ctx->internal->execute(ctx, plot_channel, NULL, NULL, s->nb_display_channels);

  1159. 

  1160.     for (y = 0; y < z * 3; y++) {

  1161.         for (x = 0; x < s->nb_display_channels; x++) {

  1162.             s->combine_buffer[y] += s->color_buffer[x][y];

  1163.         }

  1164.     }

  1165. 

  1166.     av_frame_make_writable(s->outpicref);

  1167.     /* copy to output */

  1168.     if (s->orientation == VERTICAL) {

  1169.         if (s->sliding == SCROLL) {

  1170.             for (plane = 0; plane < 3; plane++) {

  1171.                 for (y = 0; y < s->h; y++) {

  1172.                     uint8_t *p = outpicref->data[plane] + s->start_x +

  1173.                                  (y + s->start_y) * outpicref->linesize[plane];

  1174.                     memmove(p, p + 1, s->w - 1);

  1175.                 }

  1176.             }

  1177.             s->xpos = s->w - 1;

  1178.         } else if (s->sliding == RSCROLL) {

  1179.             for (plane = 0; plane < 3; plane++) {

  1180.                 for (y = 0; y < s->h; y++) {

  1181.                     uint8_t *p = outpicref->data[plane] + s->start_x +

  1182.                                  (y + s->start_y) * outpicref->linesize[plane];

  1183.                     memmove(p + 1, p, s->w - 1);

  1184.                 }

  1185.             }

  1186.             s->xpos = 0;

  1187.         }

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

  1189.             uint8_t *p = outpicref->data[plane] + s->start_x +

  1190.                          (outlink->h - 1 - s->start_y) * outpicref->linesize[plane] +

  1191.                          s->xpos;

  1192.             for (y = 0; y < s->h; y++) {

  1193.                 *p = lrintf(av_clipf(s->combine_buffer[3 * y + plane], 0, 255));

  1194.                 p -= outpicref->linesize[plane];

  1195.             }

  1196.         }

  1197.     } else {

  1198.         if (s->sliding == SCROLL) {

  1199.             for (plane = 0; plane < 3; plane++) {

  1200.                 for (y = 1; y < s->h; y++) {

  1201.                     memmove(outpicref->data[plane] + (y-1 + s->start_y) * outpicref->linesize[plane] + s->start_x,

  1202.                             outpicref->data[plane] + (y   + s->start_y) * outpicref->linesize[plane] + s->start_x,

  1203.                             s->w);

  1204.                 }

  1205.             }

  1206.             s->xpos = s->h - 1;

  1207.         } else if (s->sliding == RSCROLL) {

  1208.             for (plane = 0; plane < 3; plane++) {

  1209.                 for (y = s->h - 1; y >= 1; y--) {

  1210.                     memmove(outpicref->data[plane] + (y   + s->start_y) * outpicref->linesize[plane] + s->start_x,

  1211.                             outpicref->data[plane] + (y-1 + s->start_y) * outpicref->linesize[plane] + s->start_x,

  1212.                             s->w);

  1213.                 }

  1214.             }

  1215.             s->xpos = 0;

  1216.         }

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

  1218.             uint8_t *p = outpicref->data[plane] + s->start_x +

  1219.                          (s->xpos + s->start_y) * outpicref->linesize[plane];

  1220.             for (x = 0; x < s->w; x++) {

  1221.                 *p = lrintf(av_clipf(s->combine_buffer[3 * x + plane], 0, 255));

  1222.                 p++;

  1223.             }

  1224.         }

  1225.     }

  1226. 

  1227.     if (s->sliding != FULLFRAME || s->xpos == 0)

  1228.         outpicref->pts = av_rescale_q(insamples->pts, inlink->time_base, outlink->time_base);

  1229. 

  1230.     s->xpos++;

  1231.     if (s->orientation == VERTICAL && s->xpos >= s->w)

  1232.         s->xpos = 0;

  1233.     if (s->orientation == HORIZONTAL && s->xpos >= s->h)

  1234.         s->xpos = 0;

  1235.     if (!s->single_pic && (s->sliding != FULLFRAME || s->xpos == 0)) {

  1236.         if (s->old_pts < outpicref->pts) {

  1237.             if (s->legend) {

  1238.                 char *units = get_time(ctx, insamples->pts /(float)inlink->sample_rate, x);

  1239. 

  1240.                 if (s->orientation == VERTICAL) {

  1241.                     for (y = 0; y < 10; y++) {

  1242.                         memset(s->outpicref->data[0] + outlink->w / 2 - 4 * s->old_len +

  1243.                                (outlink->h - s->start_y / 2 - 20 + y) * s->outpicref->linesize[0], 0, 10 * s->old_len);

  1244.                     }

  1245.                     drawtext(s->outpicref,

  1246.                              outlink->w / 2 - 4 * strlen(units),

  1247.                              outlink->h - s->start_y / 2 - 20,

  1248.                              units, 0);

  1249.                 } else  {

  1250.                     for (y = 0; y < 10 * s->old_len; y++) {

  1251.                         memset(s->outpicref->data[0] + s->start_x / 7 + 20 +

  1252.                                (outlink->h / 2 - 4 * s->old_len + y) * s->outpicref->linesize[0], 0, 10);

  1253.                     }

  1254.                     drawtext(s->outpicref,

  1255.                              s->start_x / 7 + 20,

  1256.                              outlink->h / 2 - 4 * strlen(units),

  1257.                              units, 1);

  1258.                 }

  1259.                 s->old_len = strlen(units);

  1260.                 av_free(units);

  1261.             }

  1262.             s->old_pts = outpicref->pts;

  1263.             ret = ff_filter_frame(outlink, av_frame_clone(s->outpicref));

  1264.             if (ret < 0)

  1265.                 return ret;

  1266.             return 0;

  1267.         }

  1268.     }

  1269. 

  1270.     return 1;

  1271. }

  1272. 

  1273. #if CONFIG_SHOWSPECTRUM_FILTER

  1274. 

  1275. static int activate(AVFilterContext *ctx)

  1276. {

  1277.     AVFilterLink *inlink = ctx->inputs[0];

  1278.     AVFilterLink *outlink = ctx->outputs[0];

  1279.     ShowSpectrumContext *s = ctx->priv;

  1280.     int ret;

  1281. 

  1282.     FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);

  1283. 

  1284.     if (av_audio_fifo_size(s->fifo) < s->win_size) {

  1285.         AVFrame *frame = NULL;

  1286. 

  1287.         ret = ff_inlink_consume_frame(inlink, &frame);

  1288.         if (ret < 0)

  1289.             return ret;

  1290.         if (ret > 0) {

  1291.             s->pts = frame->pts;

  1292.             s->consumed = 0;

  1293. 

  1294.             av_audio_fifo_write(s->fifo, (void **)frame->extended_data, frame->nb_samples);

  1295.             av_frame_free(&frame);

  1296.         }

  1297.     }

  1298. 

  1299.     if (s->outpicref && av_audio_fifo_size(s->fifo) >= s->win_size) {

  1300.         AVFrame *fin = ff_get_audio_buffer(inlink, s->win_size);

  1301.         if (!fin)

  1302.             return AVERROR(ENOMEM);

  1303. 

  1304.         fin->pts = s->pts + s->consumed;

  1305.         s->consumed += s->hop_size;

  1306.         ret = av_audio_fifo_peek(s->fifo, (void **)fin->extended_data,

  1307.                                  FFMIN(s->win_size, av_audio_fifo_size(s->fifo)));

  1308.         if (ret < 0) {

  1309.             av_frame_free(&fin);

  1310.             return ret;

  1311.         }

  1312. 

  1313.         av_assert0(fin->nb_samples == s->win_size);

  1314. 

  1315.         ctx->internal->execute(ctx, run_channel_fft, fin, NULL, s->nb_display_channels);

  1316. 

  1317.         if (s->data == D_MAGNITUDE)

  1318.             ctx->internal->execute(ctx, calc_channel_magnitudes, NULL, NULL, s->nb_display_channels);

  1319. 

  1320.         if (s->data == D_PHASE)

  1321.             ctx->internal->execute(ctx, calc_channel_phases, NULL, NULL, s->nb_display_channels);

  1322. 

  1323.         ret = plot_spectrum_column(inlink, fin);

  1324. 

  1325.         av_frame_free(&fin);

  1326.         av_audio_fifo_drain(s->fifo, s->hop_size);

  1327.         if (ret <= 0)

  1328.             return ret;

  1329.     }

  1330. 

  1331.     if (ff_outlink_get_status(inlink) == AVERROR_EOF &&

  1332.         s->sliding == FULLFRAME &&

  1333.         s->xpos > 0 && s->outpicref) {

  1334.         int64_t pts;

  1335. 

  1336.         if (s->orientation == VERTICAL) {

  1337.             for (int i = 0; i < outlink->h; i++) {

  1338.                 memset(s->outpicref->data[0] + i * s->outpicref->linesize[0] + s->xpos,   0, outlink->w - s->xpos);

  1339.                 memset(s->outpicref->data[1] + i * s->outpicref->linesize[1] + s->xpos, 128, outlink->w - s->xpos);

  1340.                 memset(s->outpicref->data[2] + i * s->outpicref->linesize[2] + s->xpos, 128, outlink->w - s->xpos);

  1341.             }

  1342.         } else {

  1343.             for (int i = s->xpos; i < outlink->h; i++) {

  1344.                 memset(s->outpicref->data[0] + i * s->outpicref->linesize[0],   0, outlink->w);

  1345.                 memset(s->outpicref->data[1] + i * s->outpicref->linesize[1], 128, outlink->w);

  1346.                 memset(s->outpicref->data[2] + i * s->outpicref->linesize[2], 128, outlink->w);

  1347.             }

  1348.         }

  1349.         s->outpicref->pts += s->consumed;

  1350.         pts = s->outpicref->pts;

  1351.         ret = ff_filter_frame(outlink, s->outpicref);

  1352.         s->outpicref = NULL;

  1353.         ff_outlink_set_status(outlink, AVERROR_EOF, pts);

  1354.         return 0;

  1355.     }

  1356. 

  1357.     FF_FILTER_FORWARD_STATUS(inlink, outlink);

  1358.     if (ff_outlink_frame_wanted(outlink) && av_audio_fifo_size(s->fifo) < s->win_size) {

  1359.         ff_inlink_request_frame(inlink);

  1360.         return 0;

  1361.     }

  1362. 

  1363.     if (av_audio_fifo_size(s->fifo) >= s->win_size) {

  1364.         ff_filter_set_ready(ctx, 10);

  1365.         return 0;

  1366.     }

  1367.     return FFERROR_NOT_READY;

  1368. }

  1369. 

  1370. static const AVFilterPad showspectrum_inputs[] = {

  1371.     {

  1372.         .name         = "default",

  1373.         .type         = AVMEDIA_TYPE_AUDIO,

  1374.     },

  1375.     { NULL }

  1376. };

  1377. 

  1378. static const AVFilterPad showspectrum_outputs[] = {

  1379.     {

  1380.         .name          = "default",

  1381.         .type          = AVMEDIA_TYPE_VIDEO,

  1382.         .config_props  = config_output,

  1383.     },

  1384.     { NULL }

  1385. };

  1386. 

  1387. AVFilter ff_avf_showspectrum = {

  1388.     .name          = "showspectrum",

  1389.     .description   = NULL_IF_CONFIG_SMALL("Convert input audio to a spectrum video output."),

  1390.     .uninit        = uninit,

  1391.     .query_formats = query_formats,

  1392.     .priv_size     = sizeof(ShowSpectrumContext),

  1393.     .inputs        = showspectrum_inputs,

  1394.     .outputs       = showspectrum_outputs,

  1395.     .activate      = activate,

  1396.     .priv_class    = &showspectrum_class,

  1397.     .flags         = AVFILTER_FLAG_SLICE_THREADS,

  1398. };

  1399. #endif // CONFIG_SHOWSPECTRUM_FILTER

  1400. 

  1401. #if CONFIG_SHOWSPECTRUMPIC_FILTER

  1402. 

  1403. static const AVOption showspectrumpic_options[] = {

  1404.     { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "4096x2048"}, 0, 0, FLAGS },

  1405.     { "s",    "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "4096x2048"}, 0, 0, FLAGS },

  1406.     { "mode", "set channel display mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=COMBINED}, 0, NB_MODES-1, FLAGS, "mode" },

  1407.         { "combined", "combined mode", 0, AV_OPT_TYPE_CONST, {.i64=COMBINED}, 0, 0, FLAGS, "mode" },

  1408.         { "separate", "separate mode", 0, AV_OPT_TYPE_CONST, {.i64=SEPARATE}, 0, 0, FLAGS, "mode" },

  1409.     { "color", "set channel coloring", OFFSET(color_mode), AV_OPT_TYPE_INT, {.i64=INTENSITY}, 0, NB_CLMODES-1, FLAGS, "color" },

  1410.         { "channel",   "separate color for each channel", 0, AV_OPT_TYPE_CONST, {.i64=CHANNEL},   0, 0, FLAGS, "color" },

  1411.         { "intensity", "intensity based coloring",        0, AV_OPT_TYPE_CONST, {.i64=INTENSITY}, 0, 0, FLAGS, "color" },

  1412.         { "rainbow",   "rainbow based coloring",          0, AV_OPT_TYPE_CONST, {.i64=RAINBOW},   0, 0, FLAGS, "color" },

  1413.         { "moreland",  "moreland based coloring",         0, AV_OPT_TYPE_CONST, {.i64=MORELAND},  0, 0, FLAGS, "color" },

  1414.         { "nebulae",   "nebulae based coloring",          0, AV_OPT_TYPE_CONST, {.i64=NEBULAE},   0, 0, FLAGS, "color" },

  1415.         { "fire",      "fire based coloring",             0, AV_OPT_TYPE_CONST, {.i64=FIRE},      0, 0, FLAGS, "color" },

  1416.         { "fiery",     "fiery based coloring",            0, AV_OPT_TYPE_CONST, {.i64=FIERY},     0, 0, FLAGS, "color" },

  1417.         { "fruit",     "fruit based coloring",            0, AV_OPT_TYPE_CONST, {.i64=FRUIT},     0, 0, FLAGS, "color" },

  1418.         { "cool",      "cool based coloring",             0, AV_OPT_TYPE_CONST, {.i64=COOL},      0, 0, FLAGS, "color" },

  1419.         { "magma",     "magma based coloring",            0, AV_OPT_TYPE_CONST, {.i64=MAGMA},     0, 0, FLAGS, "color" },

  1420.         { "green",     "green based coloring",            0, AV_OPT_TYPE_CONST, {.i64=GREEN},     0, 0, FLAGS, "color" },

  1421.         { "viridis",   "viridis based coloring",          0, AV_OPT_TYPE_CONST, {.i64=VIRIDIS},   0, 0, FLAGS, "color" },

  1422.         { "plasma",    "plasma based coloring",           0, AV_OPT_TYPE_CONST, {.i64=PLASMA},    0, 0, FLAGS, "color" },

  1423.     { "scale", "set display scale", OFFSET(scale), AV_OPT_TYPE_INT, {.i64=LOG}, 0, NB_SCALES-1, FLAGS, "scale" },

  1424.         { "lin",  "linear",      0, AV_OPT_TYPE_CONST, {.i64=LINEAR}, 0, 0, FLAGS, "scale" },

  1425.         { "sqrt", "square root", 0, AV_OPT_TYPE_CONST, {.i64=SQRT},   0, 0, FLAGS, "scale" },

  1426.         { "cbrt", "cubic root",  0, AV_OPT_TYPE_CONST, {.i64=CBRT},   0, 0, FLAGS, "scale" },

  1427.         { "log",  "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=LOG},    0, 0, FLAGS, "scale" },

  1428.         { "4thrt","4th root",    0, AV_OPT_TYPE_CONST, {.i64=FOURTHRT}, 0, 0, FLAGS, "scale" },

  1429.         { "5thrt","5th root",    0, AV_OPT_TYPE_CONST, {.i64=FIFTHRT},  0, 0, FLAGS, "scale" },

  1430.     { "saturation", "color saturation multiplier", OFFSET(saturation), AV_OPT_TYPE_FLOAT, {.dbl = 1}, -10, 10, FLAGS },

  1431.     { "win_func", "set window function", OFFSET(win_func), AV_OPT_TYPE_INT, {.i64 = WFUNC_HANNING}, 0, NB_WFUNC-1, FLAGS, "win_func" },

  1432.         { "rect",     "Rectangular",      0, AV_OPT_TYPE_CONST, {.i64=WFUNC_RECT},     0, 0, FLAGS, "win_func" },

  1433.         { "bartlett", "Bartlett",         0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BARTLETT}, 0, 0, FLAGS, "win_func" },

  1434.         { "hann",     "Hann",             0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HANNING},  0, 0, FLAGS, "win_func" },

  1435.         { "hanning",  "Hanning",          0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HANNING},  0, 0, FLAGS, "win_func" },

  1436.         { "hamming",  "Hamming",          0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HAMMING},  0, 0, FLAGS, "win_func" },

  1437.         { "blackman", "Blackman",         0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BLACKMAN}, 0, 0, FLAGS, "win_func" },

  1438.         { "welch",    "Welch",            0, AV_OPT_TYPE_CONST, {.i64=WFUNC_WELCH},    0, 0, FLAGS, "win_func" },

  1439.         { "flattop",  "Flat-top",         0, AV_OPT_TYPE_CONST, {.i64=WFUNC_FLATTOP},  0, 0, FLAGS, "win_func" },

  1440.         { "bharris",  "Blackman-Harris",  0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHARRIS},  0, 0, FLAGS, "win_func" },

  1441.         { "bnuttall", "Blackman-Nuttall", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BNUTTALL}, 0, 0, FLAGS, "win_func" },

  1442.         { "bhann",    "Bartlett-Hann",    0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHANN},    0, 0, FLAGS, "win_func" },

  1443.         { "sine",     "Sine",             0, AV_OPT_TYPE_CONST, {.i64=WFUNC_SINE},     0, 0, FLAGS, "win_func" },

  1444.         { "nuttall",  "Nuttall",          0, AV_OPT_TYPE_CONST, {.i64=WFUNC_NUTTALL},  0, 0, FLAGS, "win_func" },

  1445.         { "lanczos",  "Lanczos",          0, AV_OPT_TYPE_CONST, {.i64=WFUNC_LANCZOS},  0, 0, FLAGS, "win_func" },

  1446.         { "gauss",    "Gauss",            0, AV_OPT_TYPE_CONST, {.i64=WFUNC_GAUSS},    0, 0, FLAGS, "win_func" },

  1447.         { "tukey",    "Tukey",            0, AV_OPT_TYPE_CONST, {.i64=WFUNC_TUKEY},    0, 0, FLAGS, "win_func" },

  1448.         { "dolph",    "Dolph-Chebyshev",  0, AV_OPT_TYPE_CONST, {.i64=WFUNC_DOLPH},    0, 0, FLAGS, "win_func" },

  1449.         { "cauchy",   "Cauchy",           0, AV_OPT_TYPE_CONST, {.i64=WFUNC_CAUCHY},   0, 0, FLAGS, "win_func" },

  1450.         { "parzen",   "Parzen",           0, AV_OPT_TYPE_CONST, {.i64=WFUNC_PARZEN},   0, 0, FLAGS, "win_func" },

  1451.         { "poisson",  "Poisson",          0, AV_OPT_TYPE_CONST, {.i64=WFUNC_POISSON},  0, 0, FLAGS, "win_func" },

  1452.         { "bohman",   "Bohman",           0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BOHMAN},   0, 0, FLAGS, "win_func" },

  1453.     { "orientation", "set orientation", OFFSET(orientation), AV_OPT_TYPE_INT, {.i64=VERTICAL}, 0, NB_ORIENTATIONS-1, FLAGS, "orientation" },

  1454.         { "vertical",   NULL, 0, AV_OPT_TYPE_CONST, {.i64=VERTICAL},   0, 0, FLAGS, "orientation" },

  1455.         { "horizontal", NULL, 0, AV_OPT_TYPE_CONST, {.i64=HORIZONTAL}, 0, 0, FLAGS, "orientation" },

  1456.     { "gain", "set scale gain", OFFSET(gain), AV_OPT_TYPE_FLOAT, {.dbl = 1}, 0, 128, FLAGS },

  1457.     { "legend", "draw legend", OFFSET(legend), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, FLAGS },

  1458.     { "rotation", "color rotation", OFFSET(rotation), AV_OPT_TYPE_FLOAT, {.dbl = 0}, -1, 1, FLAGS },

  1459.     { "start", "start frequency", OFFSET(start), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT32_MAX, FLAGS },

  1460.     { "stop",  "stop frequency",  OFFSET(stop),  AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT32_MAX, FLAGS },

  1461.     { NULL }

  1462. };

  1463. 

  1464. AVFILTER_DEFINE_CLASS(showspectrumpic);

  1465. 

  1466. static int showspectrumpic_request_frame(AVFilterLink *outlink)

  1467. {

  1468.     AVFilterContext *ctx = outlink->src;

  1469.     ShowSpectrumContext *s = ctx->priv;

  1470.     AVFilterLink *inlink = ctx->inputs[0];

  1471.     int ret, samples;

  1472. 

  1473.     ret = ff_request_frame(inlink);

  1474.     samples = av_audio_fifo_size(s->fifo);

  1475.     if (ret == AVERROR_EOF && s->outpicref && samples > 0) {

  1476.         int consumed = 0;

  1477.         int x = 0, sz = s->orientation == VERTICAL ? s->w : s->h;

  1478.         int ch, spf, spb;

  1479.         AVFrame *fin;

  1480. 

  1481.         spf = s->win_size * (samples / ((s->win_size * sz) * ceil(samples / (float)(s->win_size * sz))));

  1482.         spf = FFMAX(1, spf);

  1483. 

  1484.         spb = (samples / (spf * sz)) * spf;

  1485. 

  1486.         fin = ff_get_audio_buffer(inlink, s->win_size);

  1487.         if (!fin)

  1488.             return AVERROR(ENOMEM);

  1489. 

  1490.         while (x < sz) {

  1491.             ret = av_audio_fifo_peek(s->fifo, (void **)fin->extended_data, s->win_size);

  1492.             if (ret < 0) {

  1493.                 av_frame_free(&fin);

  1494.                 return ret;

  1495.             }

  1496. 

  1497.             av_audio_fifo_drain(s->fifo, spf);

  1498. 

  1499.             if (ret < s->win_size) {

  1500.                 for (ch = 0; ch < s->nb_display_channels; ch++) {

  1501.                     memset(fin->extended_data[ch] + ret * sizeof(float), 0,

  1502.                            (s->win_size - ret) * sizeof(float));

  1503.                 }

  1504.             }

  1505. 

  1506.             ctx->internal->execute(ctx, run_channel_fft, fin, NULL, s->nb_display_channels);

  1507.             acalc_magnitudes(s);

  1508. 

  1509.             consumed += spf;

  1510.             if (consumed >= spb) {

  1511.                 int h = s->orientation == VERTICAL ? s->h : s->w;

  1512. 

  1513.                 scale_magnitudes(s, 1. / (consumed / spf));

  1514.                 plot_spectrum_column(inlink, fin);

  1515.                 consumed = 0;

  1516.                 x++;

  1517.                 for (ch = 0; ch < s->nb_display_channels; ch++)

  1518.                     memset(s->magnitudes[ch], 0, h * sizeof(float));

  1519.             }

  1520.         }

  1521. 

  1522.         av_frame_free(&fin);

  1523.         s->outpicref->pts = 0;

  1524. 

  1525.         if (s->legend)

  1526.             draw_legend(ctx, samples);

  1527. 

  1528.         ret = ff_filter_frame(outlink, s->outpicref);

  1529.         s->outpicref = NULL;

  1530.     }

  1531. 

  1532.     return ret;

  1533. }

  1534. 

  1535. static int showspectrumpic_filter_frame(AVFilterLink *inlink, AVFrame *insamples)

  1536. {

  1537.     AVFilterContext *ctx = inlink->dst;

  1538.     ShowSpectrumContext *s = ctx->priv;

  1539.     int ret;

  1540. 

  1541.     ret = av_audio_fifo_write(s->fifo, (void **)insamples->extended_data, insamples->nb_samples);

  1542.     av_frame_free(&insamples);

  1543.     return ret;

  1544. }

  1545. 

  1546. static const AVFilterPad showspectrumpic_inputs[] = {

  1547.     {

  1548.         .name         = "default",

  1549.         .type         = AVMEDIA_TYPE_AUDIO,

  1550.         .filter_frame = showspectrumpic_filter_frame,

  1551.     },

  1552.     { NULL }

  1553. };

  1554. 

  1555. static const AVFilterPad showspectrumpic_outputs[] = {

  1556.     {

  1557.         .name          = "default",

  1558.         .type          = AVMEDIA_TYPE_VIDEO,

  1559.         .config_props  = config_output,

  1560.         .request_frame = showspectrumpic_request_frame,

  1561.     },

  1562.     { NULL }

  1563. };

  1564. 

  1565. AVFilter ff_avf_showspectrumpic = {

  1566.     .name          = "showspectrumpic",

  1567.     .description   = NULL_IF_CONFIG_SMALL("Convert input audio to a spectrum video output single picture."),

  1568.     .uninit        = uninit,

  1569.     .query_formats = query_formats,

  1570.     .priv_size     = sizeof(ShowSpectrumContext),

  1571.     .inputs        = showspectrumpic_inputs,

  1572.     .outputs       = showspectrumpic_outputs,

  1573.     .priv_class    = &showspectrumpic_class,

  1574.     .flags         = AVFILTER_FLAG_SLICE_THREADS,

  1575. };

  1576. 

  1577. #endif // CONFIG_SHOWSPECTRUMPIC_FILTER