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

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

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

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

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

  131.         { "4thrt","4th root",    0, AV_OPT_TYPE_CONST, {.i64=FOURTHRT}, 0, 0, FLAGS, "scale" },

  132.         { "5thrt","5th root",    0, AV_OPT_TYPE_CONST, {.i64=FIFTHRT},  0, 0, FLAGS, "scale" },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  168.     { NULL }

  169. };

  170. 

  171. AVFILTER_DEFINE_CLASS(showspectrum);

  172. 

  173. static const struct ColorTable {

  174.     float a, y, u, v;

  175. } color_table[][8] = {

  176.     [INTENSITY] = {

  177.     {    0,                  0,                  0,                   0 },

  178.     { 0.13, .03587126228984074,  .1573300977624594, -.02548747583751842 },

  179.     { 0.30, .18572281794568020,  .1772436246393981,  .17475554840414750 },

  180.     { 0.60, .28184980583656130, -.1593064119945782,  .47132074554608920 },

  181.     { 0.73, .65830621175547810, -.3716070802232764,  .24352759331252930 },

  182.     { 0.78, .76318535758242900, -.4307467689263783,  .16866496622310430 },

  183.     { 0.91, .95336363636363640, -.2045454545454546,  .03313636363636363 },

  184.     {    1,                  1,                  0,                   0 }},

  185.     [RAINBOW] = {

  186.     {    0,                  0,                  0,                   0 },

  187.     { 0.13,            44/256.,     (189-128)/256.,      (138-128)/256. },

  188.     { 0.25,            29/256.,     (186-128)/256.,      (119-128)/256. },

  189.     { 0.38,           119/256.,     (194-128)/256.,       (53-128)/256. },

  190.     { 0.60,           111/256.,      (73-128)/256.,       (59-128)/256. },

  191.     { 0.73,           205/256.,      (19-128)/256.,      (149-128)/256. },

  192.     { 0.86,           135/256.,      (83-128)/256.,      (200-128)/256. },

  193.     {    1,            73/256.,      (95-128)/256.,      (225-128)/256. }},

  194.     [MORELAND] = {

  195.     {    0,            44/256.,     (181-128)/256.,      (112-128)/256. },

  196.     { 0.13,           126/256.,     (177-128)/256.,      (106-128)/256. },

  197.     { 0.25,           164/256.,     (163-128)/256.,      (109-128)/256. },

  198.     { 0.38,           200/256.,     (140-128)/256.,      (120-128)/256. },

  199.     { 0.60,           201/256.,     (117-128)/256.,      (141-128)/256. },

  200.     { 0.73,           177/256.,     (103-128)/256.,      (165-128)/256. },

  201.     { 0.86,           136/256.,     (100-128)/256.,      (183-128)/256. },

  202.     {    1,            68/256.,     (117-128)/256.,      (203-128)/256. }},

  203.     [NEBULAE] = {

  204.     {    0,            10/256.,     (134-128)/256.,      (132-128)/256. },

  205.     { 0.23,            21/256.,     (137-128)/256.,      (130-128)/256. },

  206.     { 0.45,            35/256.,     (134-128)/256.,      (134-128)/256. },

  207.     { 0.57,            51/256.,     (130-128)/256.,      (139-128)/256. },

  208.     { 0.67,           104/256.,     (116-128)/256.,      (162-128)/256. },

  209.     { 0.77,           120/256.,     (105-128)/256.,      (188-128)/256. },

  210.     { 0.87,           140/256.,     (105-128)/256.,      (188-128)/256. },

  211.     {    1,                  1,                  0,                   0 }},

  212.     [FIRE] = {

  213.     {    0,                  0,                  0,                   0 },

  214.     { 0.23,            44/256.,     (132-128)/256.,      (127-128)/256. },

  215.     { 0.45,            62/256.,     (116-128)/256.,      (140-128)/256. },

  216.     { 0.57,            75/256.,     (105-128)/256.,      (152-128)/256. },

  217.     { 0.67,            95/256.,      (91-128)/256.,      (166-128)/256. },

  218.     { 0.77,           126/256.,      (74-128)/256.,      (172-128)/256. },

  219.     { 0.87,           164/256.,      (73-128)/256.,      (162-128)/256. },

  220.     {    1,                  1,                  0,                   0 }},

  221.     [FIERY] = {

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

  223.     { 0.23,            36/256.,     (116-128)/256.,      (163-128)/256. },

  224.     { 0.45,            52/256.,     (102-128)/256.,      (200-128)/256. },

  225.     { 0.57,           116/256.,      (84-128)/256.,      (196-128)/256. },

  226.     { 0.67,           157/256.,      (67-128)/256.,      (181-128)/256. },

  227.     { 0.77,           193/256.,      (40-128)/256.,      (155-128)/256. },

  228.     { 0.87,           221/256.,     (101-128)/256.,      (134-128)/256. },

  229.     {    1,                  1,                  0,                   0 }},

  230.     [FRUIT] = {

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

  232.     { 0.20,            29/256.,     (136-128)/256.,      (119-128)/256. },

  233.     { 0.30,            60/256.,     (119-128)/256.,       (90-128)/256. },

  234.     { 0.40,            85/256.,      (91-128)/256.,       (85-128)/256. },

  235.     { 0.50,           116/256.,      (70-128)/256.,      (105-128)/256. },

  236.     { 0.60,           151/256.,      (50-128)/256.,      (146-128)/256. },

  237.     { 0.70,           191/256.,      (63-128)/256.,      (178-128)/256. },

  238.     {    1,            98/256.,      (80-128)/256.,      (221-128)/256. }},

  239.     [COOL] = {

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

  241.     {  .15,                  0,                 .5,                 -.5 },

  242.     {    1,                  1,                -.5,                  .5 }},

  243.     [MAGMA] = {

  244.     {    0,                  0,                  0,                   0 },

  245.     { 0.10,            23/256.,     (175-128)/256.,      (120-128)/256. },

  246.     { 0.23,            43/256.,     (158-128)/256.,      (144-128)/256. },

  247.     { 0.35,            85/256.,     (138-128)/256.,      (179-128)/256. },

  248.     { 0.48,            96/256.,     (128-128)/256.,      (189-128)/256. },

  249.     { 0.64,           128/256.,     (103-128)/256.,      (214-128)/256. },

  250.     { 0.78,           167/256.,      (85-128)/256.,      (174-128)/256. },

  251.     {    1,           205/256.,      (80-128)/256.,      (152-128)/256. }},

  252.     [GREEN] = {

  253.     {    0,                  0,                  0,                   0 },

  254.     {  .75,                 .5,                  0,                 -.5 },

  255.     {    1,                  1,                  0,                   0 }},

  256. };

  257. 

  258. static av_cold void uninit(AVFilterContext *ctx)

  259. {

  260.     ShowSpectrumContext *s = ctx->priv;

  261.     int i;

  262. 

  263.     av_freep(&s->combine_buffer);

  264.     if (s->fft) {

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

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

  267.     }

  268.     av_freep(&s->fft);

  269.     if (s->ifft) {

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

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

  272.     }

  273.     av_freep(&s->ifft);

  274.     if (s->fft_data) {

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

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

  277.     }

  278.     av_freep(&s->fft_data);

  279.     if (s->fft_scratch) {

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

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

  282.     }

  283.     av_freep(&s->fft_scratch);

  284.     if (s->color_buffer) {

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

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

  287.     }

  288.     av_freep(&s->color_buffer);

  289.     av_freep(&s->window_func_lut);

  290.     if (s->magnitudes) {

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

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

  293.     }

  294.     av_freep(&s->magnitudes);

  295.     av_frame_free(&s->outpicref);

  296.     av_audio_fifo_free(s->fifo);

  297.     if (s->phases) {

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

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

  300.     }

  301.     av_freep(&s->phases);

  302. }

  303. 

  304. static int query_formats(AVFilterContext *ctx)

  305. {

  306.     AVFilterFormats *formats = NULL;

  307.     AVFilterChannelLayouts *layouts = NULL;

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

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

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

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

  312.     int ret;

  313. 

  314.     /* set input audio formats */

  315.     formats = ff_make_format_list(sample_fmts);

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

  317.         return ret;

  318. 

  319.     layouts = ff_all_channel_layouts();

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

  321.         return ret;

  322. 

  323.     formats = ff_all_samplerates();

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

  325.         return ret;

  326. 

  327.     /* set output video format */

  328.     formats = ff_make_format_list(pix_fmts);

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

  330.         return ret;

  331. 

  332.     return 0;

  333. }

  334. 

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

  336. {

  337.     ShowSpectrumContext *s = ctx->priv;

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

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

  340.     AVFrame *fin = arg;

  341.     const int ch = jobnr;

  342.     int n;

  343. 

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

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

  346. 

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

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

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

  350.     }

  351. 

  352.     if (s->stop) {

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

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

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

  356.         int L = s->buf_size;

  357.         int N = s->win_size;

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

  359. 

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

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

  362. 

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

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

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

  366.         }

  367. 

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

  369.             h[n].re = 0.0;

  370.             h[n].im = 0.0;

  371.         }

  372. 

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

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

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

  376.         }

  377. 

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

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

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

  381.         }

  382. 

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

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

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

  386.         }

  387. 

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

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

  390.             c =  cos(psi);

  391.             S = -sin(psi);

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

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

  394.             g[n].re = a;

  395.             g[n].im = b;

  396.         }

  397. 

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

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

  400. 

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

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

  403. 

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

  405.             c = g[n].re;

  406.             S = g[n].im;

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

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

  409. 

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

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

  412.         }

  413. 

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

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

  416. 

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

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

  419.             c =  cos(psi);

  420.             S = -sin(psi);

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

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

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

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

  425.         }

  426.     } else {

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

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

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

  430.     }

  431. 

  432.     return 0;

  433. }

  434. 

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

  436. {

  437.     const uint8_t *font;

  438.     int font_height;

  439.     int i;

  440. 

  441.     font = avpriv_cga_font,   font_height =  8;

  442. 

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

  444.         int char_y, mask;

  445. 

  446.         if (o) {

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

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

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

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

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

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

  453.                 }

  454.             }

  455.         } else {

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

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

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

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

  460.                         *p = ~(*p);

  461.                     p++;

  462.                 }

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

  464.             }

  465.         }

  466.     }

  467. }

  468. 

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

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

  471. {

  472.     switch (s->mode) {

  473.     case COMBINED:

  474.         // reduce range by channel count

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

  476.         switch (s->color_mode) {

  477.         case RAINBOW:

  478.         case MORELAND:

  479.         case NEBULAE:

  480.         case FIRE:

  481.         case FIERY:

  482.         case FRUIT:

  483.         case COOL:

  484.         case GREEN:

  485.         case MAGMA:

  486.         case INTENSITY:

  487.             *uf = *yf;

  488.             *vf = *yf;

  489.             break;

  490.         case CHANNEL:

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

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

  493.             *uf = *yf * M_PI;

  494.             *vf = *yf * M_PI;

  495.             break;

  496.         default:

  497.             av_assert0(0);

  498.         }

  499.         break;

  500.     case SEPARATE:

  501.         // full range

  502.         *yf = 256.0f;

  503.         *uf = 256.0f;

  504.         *vf = 256.0f;

  505.         break;

  506.     default:

  507.         av_assert0(0);

  508.     }

  509. 

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

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

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

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

  514.         } else {

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

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

  517.         }

  518.     } else {

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

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

  521.     }

  522. 

  523.     *uf *= s->saturation;

  524.     *vf *= s->saturation;

  525. }

  526. 

  527. static void pick_color(ShowSpectrumContext *s,

  528.                        float yf, float uf, float vf,

  529.                        float a, float *out)

  530. {

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

  532.         const int cm = s->color_mode;

  533.         float y, u, v;

  534.         int i;

  535. 

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

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

  538.                 break;

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

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

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

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

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

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

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

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

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

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

  549.         } else {

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

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

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

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

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

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

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

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

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

  559.         }

  560. 

  561.         out[0] = y * yf;

  562.         out[1] = u * uf;

  563.         out[2] = v * vf;

  564.     } else {

  565.         out[0] = a * yf;

  566.         out[1] = a * uf;

  567.         out[2] = a * vf;

  568.     }

  569. }

  570. 

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

  572. {

  573.     char *units;

  574. 

  575.     if (x == 0)

  576.         units = av_asprintf("0");

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

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

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

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

  581.     else

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

  583.     return units;

  584. }

  585. 

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

  587. {

  588.     ShowSpectrumContext *s = ctx->priv;

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

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

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

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

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

  594.     char *text;

  595.     uint8_t *dst;

  596.     char chlayout_str[128];

  597. 

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

  599.                                  inlink->channel_layout);

  600. 

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

  602. 

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

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

  605.     if (s->stop) {

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

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

  608.         av_freep(&text);

  609.     }

  610. 

  611.     av_freep(&text);

  612. 

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

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

  615.         dst[x] = 200;

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

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

  618.         dst[x] = 200;

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

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

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

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

  623.     }

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

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

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

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

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

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

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

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

  632.             }

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

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

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

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

  637.             }

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

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

  640.                 dst[x] = 200;

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

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

  643.                 dst[x] = 200;

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

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

  646.                 dst[x] = 200;

  647.             }

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

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

  650.                 dst[x] = 200;

  651.             }

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

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

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

  655.                 char *units;

  656. 

  657.                 if (hertz == 0)

  658.                     units = av_asprintf("DC");

  659.                 else

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

  661.                 if (!units)

  662.                     return AVERROR(ENOMEM);

  663. 

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

  665.                 av_free(units);

  666.             }

  667.         }

  668. 

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

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

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

  672. 

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

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

  675.             av_free(units);

  676.         }

  677. 

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

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

  680.     } else {

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

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

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

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

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

  686.         }

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

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

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

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

  691.         }

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

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

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

  695.                 dst[x] = 200;

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

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

  698.                 dst[x] = 200;

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

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

  701.                 dst[x] = 200;

  702.             }

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

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

  705.                 dst[x] = 200;

  706.             }

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

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

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

  710.                 char *units;

  711. 

  712.                 if (hertz == 0)

  713.                     units = av_asprintf("DC");

  714.                 else

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

  716.                 if (!units)

  717.                     return AVERROR(ENOMEM);

  718. 

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

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

  721.                 av_free(units);

  722.             }

  723.         }

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

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

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

  727. 

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

  729.             av_free(units);

  730.         }

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

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

  733.     }

  734. 

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

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

  737. 

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

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

  740.             int chn;

  741. 

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

  743.                 float yf, uf, vf;

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

  745.                 float lout[3];

  746. 

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

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

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

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

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

  752.             }

  753.             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);

  754.             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);

  755.             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);

  756.         }

  757. 

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

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

  760.             char *text;

  761. 

  762.             if (value < -120)

  763.                 break;

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

  765.             if (!text)

  766.                 continue;

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

  768.             av_free(text);

  769.         }

  770.     }

  771. 

  772.     return 0;

  773. }

  774. 

  775. static int config_output(AVFilterLink *outlink)

  776. {

  777.     AVFilterContext *ctx = outlink->src;

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

  779.     ShowSpectrumContext *s = ctx->priv;

  780.     int i, fft_bits, h, w;

  781.     float overlap;

  782. 

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

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

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

  786.         return AVERROR(EINVAL);

  787.     }

  788. 

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

  790.         s->single_pic = 1;

  791. 

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

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

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

  795. 

  796.     if (s->legend) {

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

  798.         s->start_y = 64;

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

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

  801.     }

  802. 

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

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

  805.     s->channel_height = h;

  806.     s->channel_width  = w;

  807. 

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

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

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

  811.     } else {

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

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

  814.     }

  815. 

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

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

  818. 

  819.     if (!s->fft) {

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

  821.         if (!s->fft)

  822.             return AVERROR(ENOMEM);

  823.     }

  824. 

  825.     if (s->stop) {

  826.         if (!s->ifft) {

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

  828.             if (!s->ifft)

  829.                 return AVERROR(ENOMEM);

  830.         }

  831.     }

  832. 

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

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

  835.         AVFrame *outpicref;

  836. 

  837.         s->fft_bits = fft_bits;

  838. 

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

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

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

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

  843.             if (s->stop) {

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

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

  846.             }

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

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

  849.         }

  850.         av_freep(&s->fft_data);

  851. 

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

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

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

  855.             if (s->stop) {

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

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

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

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

  860.                     return AVERROR(EINVAL);

  861.                 }

  862.             }

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

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

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

  866.                 return AVERROR(EINVAL);

  867.             }

  868.         }

  869. 

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

  871.         if (!s->magnitudes)

  872.             return AVERROR(ENOMEM);

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

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

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

  876.                 return AVERROR(ENOMEM);

  877.         }

  878. 

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

  880.         if (!s->phases)

  881.             return AVERROR(ENOMEM);

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

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

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

  885.                 return AVERROR(ENOMEM);

  886.         }

  887. 

  888.         av_freep(&s->color_buffer);

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

  890.         if (!s->color_buffer)

  891.             return AVERROR(ENOMEM);

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

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

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

  895.                 return AVERROR(ENOMEM);

  896.         }

  897. 

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

  899.         if (!s->fft_data)

  900.             return AVERROR(ENOMEM);

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

  902.         if (!s->fft_scratch)

  903.             return AVERROR(ENOMEM);

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

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

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

  907.                 return AVERROR(ENOMEM);

  908. 

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

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

  911.                 return AVERROR(ENOMEM);

  912.         }

  913. 

  914.         /* pre-calc windowing function */

  915.         s->window_func_lut =

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

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

  918.         if (!s->window_func_lut)

  919.             return AVERROR(ENOMEM);

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

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

  922.             s->overlap = overlap;

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

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

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

  926.             return AVERROR(EINVAL);

  927.         }

  928. 

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

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

  931.         }

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

  933. 

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

  935.         av_frame_free(&s->outpicref);

  936.         s->outpicref = outpicref =

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

  938.         if (!outpicref)

  939.             return AVERROR(ENOMEM);

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

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

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

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

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

  945.         }

  946.         outpicref->color_range = AVCOL_RANGE_JPEG;

  947. 

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

  949.             draw_legend(ctx, 0);

  950.     }

  951. 

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

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

  954.         s->xpos = 0;

  955. 

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

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

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

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

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

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

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

  963.         if (ret < 0)

  964.             return ret;

  965.     } else {

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

  967.     }

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

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

  970. 

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

  972.         s->combine_buffer =

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

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

  975.     } else {

  976.         s->combine_buffer =

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

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

  979.     }

  980. 

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

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

  983. 

  984.     av_audio_fifo_free(s->fifo);

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

  986.     if (!s->fifo)

  987.         return AVERROR(ENOMEM);

  988.     return 0;

  989. }

  990. 

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

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

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

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

  995. 

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

  997. {

  998.     ShowSpectrumContext *s = ctx->priv;

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

  1000.     int y, h = s->orientation == VERTICAL ? s->h : s->w;

  1001.     const float f = s->gain * w;

  1002.     const int ch = jobnr;

  1003.     float *magnitudes = s->magnitudes[ch];

  1004. 

  1005.     for (y = 0; y < h; y++)

  1006.         magnitudes[y] = MAGNITUDE(y, ch) * f;

  1007. 

  1008.     return 0;

  1009. }

  1010. 

  1011. static int calc_channel_phases(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)

  1012. {

  1013.     ShowSpectrumContext *s = ctx->priv;

  1014.     const int h = s->orientation == VERTICAL ? s->h : s->w;

  1015.     const int ch = jobnr;

  1016.     float *phases = s->phases[ch];

  1017.     int y;

  1018. 

  1019.     for (y = 0; y < h; y++)

  1020.         phases[y] = (PHASE(y, ch) / M_PI + 1) / 2;

  1021. 

  1022.     return 0;

  1023. }

  1024. 

  1025. static void acalc_magnitudes(ShowSpectrumContext *s)

  1026. {

  1027.     const double w = s->win_scale * (s->scale == LOG ? s->win_scale : 1);

  1028.     int ch, y, h = s->orientation == VERTICAL ? s->h : s->w;

  1029.     const float f = s->gain * w;

  1030. 

  1031.     for (ch = 0; ch < s->nb_display_channels; ch++) {

  1032.         float *magnitudes = s->magnitudes[ch];

  1033. 

  1034.         for (y = 0; y < h; y++)

  1035.             magnitudes[y] += MAGNITUDE(y, ch) * f;

  1036.     }

  1037. }

  1038. 

  1039. static void scale_magnitudes(ShowSpectrumContext *s, float scale)

  1040. {

  1041.     int ch, y, h = s->orientation == VERTICAL ? s->h : s->w;

  1042. 

  1043.     for (ch = 0; ch < s->nb_display_channels; ch++) {

  1044.         float *magnitudes = s->magnitudes[ch];

  1045. 

  1046.         for (y = 0; y < h; y++)

  1047.             magnitudes[y] *= scale;

  1048.     }

  1049. }

  1050. 

  1051. static void clear_combine_buffer(ShowSpectrumContext *s, int size)

  1052. {

  1053.     int y;

  1054. 

  1055.     for (y = 0; y < size; y++) {

  1056.         s->combine_buffer[3 * y    ] = 0;

  1057.         s->combine_buffer[3 * y + 1] = 127.5;

  1058.         s->combine_buffer[3 * y + 2] = 127.5;

  1059.     }

  1060. }

  1061. 

  1062. static int plot_channel(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)

  1063. {

  1064.     ShowSpectrumContext *s = ctx->priv;

  1065.     const int h = s->orientation == VERTICAL ? s->channel_height : s->channel_width;

  1066.     const int ch = jobnr;

  1067.     float *magnitudes = s->magnitudes[ch];

  1068.     float *phases = s->phases[ch];

  1069.     float yf, uf, vf;

  1070.     int y;

  1071. 

  1072.     /* decide color range */

  1073.     color_range(s, ch, &yf, &uf, &vf);

  1074. 

  1075.     /* draw the channel */

  1076.     for (y = 0; y < h; y++) {

  1077.         int row = (s->mode == COMBINED) ? y : ch * h + y;

  1078.         float *out = &s->color_buffer[ch][3 * row];

  1079.         float a;

  1080. 

  1081.         switch (s->data) {

  1082.         case D_MAGNITUDE:

  1083.             /* get magnitude */

  1084.             a = magnitudes[y];

  1085.             break;

  1086.         case D_PHASE:

  1087.             /* get phase */

  1088.             a = phases[y];

  1089.             break;

  1090.         default:

  1091.             av_assert0(0);

  1092.         }

  1093. 

  1094.         /* apply scale */

  1095.         switch (s->scale) {

  1096.         case LINEAR:

  1097.             a = av_clipf(a, 0, 1);

  1098.             break;

  1099.         case SQRT:

  1100.             a = av_clipf(sqrt(a), 0, 1);

  1101.             break;

  1102.         case CBRT:

  1103.             a = av_clipf(cbrt(a), 0, 1);

  1104.             break;

  1105.         case FOURTHRT:

  1106.             a = av_clipf(sqrt(sqrt(a)), 0, 1);

  1107.             break;

  1108.         case FIFTHRT:

  1109.             a = av_clipf(pow(a, 0.20), 0, 1);

  1110.             break;

  1111.         case LOG:

  1112.             a = 1 + log10(av_clipd(a, 1e-6, 1)) / 6; // zero = -120dBFS

  1113.             break;

  1114.         default:

  1115.             av_assert0(0);

  1116.         }

  1117. 

  1118.         pick_color(s, yf, uf, vf, a, out);

  1119.     }

  1120. 

  1121.     return 0;

  1122. }

  1123. 

  1124. static int plot_spectrum_column(AVFilterLink *inlink, AVFrame *insamples)

  1125. {

  1126.     AVFilterContext *ctx = inlink->dst;

  1127.     AVFilterLink *outlink = ctx->outputs[0];

  1128.     ShowSpectrumContext *s = ctx->priv;

  1129.     AVFrame *outpicref = s->outpicref;

  1130.     int ret, plane, x, y, z = s->orientation == VERTICAL ? s->h : s->w;

  1131. 

  1132.     /* fill a new spectrum column */

  1133.     /* initialize buffer for combining to black */

  1134.     clear_combine_buffer(s, z);

  1135. 

  1136.     ctx->internal->execute(ctx, plot_channel, NULL, NULL, s->nb_display_channels);

  1137. 

  1138.     for (y = 0; y < z * 3; y++) {

  1139.         for (x = 0; x < s->nb_display_channels; x++) {

  1140.             s->combine_buffer[y] += s->color_buffer[x][y];

  1141.         }

  1142.     }

  1143. 

  1144.     av_frame_make_writable(s->outpicref);

  1145.     /* copy to output */

  1146.     if (s->orientation == VERTICAL) {

  1147.         if (s->sliding == SCROLL) {

  1148.             for (plane = 0; plane < 3; plane++) {

  1149.                 for (y = 0; y < s->h; y++) {

  1150.                     uint8_t *p = outpicref->data[plane] + s->start_x +

  1151.                                  (y + s->start_y) * outpicref->linesize[plane];

  1152.                     memmove(p, p + 1, s->w - 1);

  1153.                 }

  1154.             }

  1155.             s->xpos = s->w - 1;

  1156.         } else if (s->sliding == RSCROLL) {

  1157.             for (plane = 0; plane < 3; plane++) {

  1158.                 for (y = 0; y < s->h; y++) {

  1159.                     uint8_t *p = outpicref->data[plane] + s->start_x +

  1160.                                  (y + s->start_y) * outpicref->linesize[plane];

  1161.                     memmove(p + 1, p, s->w - 1);

  1162.                 }

  1163.             }

  1164.             s->xpos = 0;

  1165.         }

  1166.         for (plane = 0; plane < 3; plane++) {

  1167.             uint8_t *p = outpicref->data[plane] + s->start_x +

  1168.                          (outlink->h - 1 - s->start_y) * outpicref->linesize[plane] +

  1169.                          s->xpos;

  1170.             for (y = 0; y < s->h; y++) {

  1171.                 *p = lrintf(av_clipf(s->combine_buffer[3 * y + plane], 0, 255));

  1172.                 p -= outpicref->linesize[plane];

  1173.             }

  1174.         }

  1175.     } else {

  1176.         if (s->sliding == SCROLL) {

  1177.             for (plane = 0; plane < 3; plane++) {

  1178.                 for (y = 1; y < s->h; y++) {

  1179.                     memmove(outpicref->data[plane] + (y-1 + s->start_y) * outpicref->linesize[plane] + s->start_x,

  1180.                             outpicref->data[plane] + (y   + s->start_y) * outpicref->linesize[plane] + s->start_x,

  1181.                             s->w);

  1182.                 }

  1183.             }

  1184.             s->xpos = s->h - 1;

  1185.         } else if (s->sliding == RSCROLL) {

  1186.             for (plane = 0; plane < 3; plane++) {

  1187.                 for (y = s->h - 1; y >= 1; y--) {

  1188.                     memmove(outpicref->data[plane] + (y   + s->start_y) * outpicref->linesize[plane] + s->start_x,

  1189.                             outpicref->data[plane] + (y-1 + s->start_y) * outpicref->linesize[plane] + s->start_x,

  1190.                             s->w);

  1191.                 }

  1192.             }

  1193.             s->xpos = 0;

  1194.         }

  1195.         for (plane = 0; plane < 3; plane++) {

  1196.             uint8_t *p = outpicref->data[plane] + s->start_x +

  1197.                          (s->xpos + s->start_y) * outpicref->linesize[plane];

  1198.             for (x = 0; x < s->w; x++) {

  1199.                 *p = lrintf(av_clipf(s->combine_buffer[3 * x + plane], 0, 255));

  1200.                 p++;

  1201.             }

  1202.         }

  1203.     }

  1204. 

  1205.     if (s->sliding != FULLFRAME || s->xpos == 0)

  1206.         outpicref->pts = av_rescale_q(insamples->pts, inlink->time_base, outlink->time_base);

  1207. 

  1208.     s->xpos++;

  1209.     if (s->orientation == VERTICAL && s->xpos >= s->w)

  1210.         s->xpos = 0;

  1211.     if (s->orientation == HORIZONTAL && s->xpos >= s->h)

  1212.         s->xpos = 0;

  1213.     if (!s->single_pic && (s->sliding != FULLFRAME || s->xpos == 0)) {

  1214.         if (s->old_pts < outpicref->pts) {

  1215.             if (s->legend) {

  1216.                 char *units = get_time(ctx, insamples->pts /(float)inlink->sample_rate, x);

  1217. 

  1218.                 if (s->orientation == VERTICAL) {

  1219.                     for (y = 0; y < 10; y++) {

  1220.                         memset(s->outpicref->data[0] + outlink->w / 2 - 4 * s->old_len +

  1221.                                (outlink->h - s->start_y / 2 - 20 + y) * s->outpicref->linesize[0], 0, 10 * s->old_len);

  1222.                     }

  1223.                     drawtext(s->outpicref,

  1224.                              outlink->w / 2 - 4 * strlen(units),

  1225.                              outlink->h - s->start_y / 2 - 20,

  1226.                              units, 0);

  1227.                 } else  {

  1228.                     for (y = 0; y < 10 * s->old_len; y++) {

  1229.                         memset(s->outpicref->data[0] + s->start_x / 7 + 20 +

  1230.                                (outlink->h / 2 - 4 * s->old_len + y) * s->outpicref->linesize[0], 0, 10);

  1231.                     }

  1232.                     drawtext(s->outpicref,

  1233.                              s->start_x / 7 + 20,

  1234.                              outlink->h / 2 - 4 * strlen(units),

  1235.                              units, 1);

  1236.                 }

  1237.                 s->old_len = strlen(units);

  1238.                 av_free(units);

  1239.             }

  1240.             s->old_pts = outpicref->pts;

  1241.             ret = ff_filter_frame(outlink, av_frame_clone(s->outpicref));

  1242.             if (ret < 0)

  1243.                 return ret;

  1244.             return 0;

  1245.         }

  1246.     }

  1247. 

  1248.     return 1;

  1249. }

  1250. 

  1251. #if CONFIG_SHOWSPECTRUM_FILTER

  1252. 

  1253. static int activate(AVFilterContext *ctx)

  1254. {

  1255.     AVFilterLink *inlink = ctx->inputs[0];

  1256.     AVFilterLink *outlink = ctx->outputs[0];

  1257.     ShowSpectrumContext *s = ctx->priv;

  1258.     int ret;

  1259. 

  1260.     FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);

  1261. 

  1262.     if (av_audio_fifo_size(s->fifo) < s->win_size) {

  1263.         AVFrame *frame = NULL;

  1264. 

  1265.         ret = ff_inlink_consume_frame(inlink, &frame);

  1266.         if (ret < 0)

  1267.             return ret;

  1268.         if (ret > 0) {

  1269.             s->pts = frame->pts;

  1270.             s->consumed = 0;

  1271. 

  1272.             av_audio_fifo_write(s->fifo, (void **)frame->extended_data, frame->nb_samples);

  1273.             av_frame_free(&frame);

  1274.         }

  1275.     }

  1276. 

  1277.     if (s->outpicref && av_audio_fifo_size(s->fifo) >= s->win_size) {

  1278.         AVFrame *fin = ff_get_audio_buffer(inlink, s->win_size);

  1279.         if (!fin)

  1280.             return AVERROR(ENOMEM);

  1281. 

  1282.         fin->pts = s->pts + s->consumed;

  1283.         s->consumed += s->hop_size;

  1284.         ret = av_audio_fifo_peek(s->fifo, (void **)fin->extended_data,

  1285.                                  FFMIN(s->win_size, av_audio_fifo_size(s->fifo)));

  1286.         if (ret < 0) {

  1287.             av_frame_free(&fin);

  1288.             return ret;

  1289.         }

  1290. 

  1291.         av_assert0(fin->nb_samples == s->win_size);

  1292. 

  1293.         ctx->internal->execute(ctx, run_channel_fft, fin, NULL, s->nb_display_channels);

  1294. 

  1295.         if (s->data == D_MAGNITUDE)

  1296.             ctx->internal->execute(ctx, calc_channel_magnitudes, NULL, NULL, s->nb_display_channels);

  1297. 

  1298.         if (s->data == D_PHASE)

  1299.             ctx->internal->execute(ctx, calc_channel_phases, NULL, NULL, s->nb_display_channels);

  1300. 

  1301.         ret = plot_spectrum_column(inlink, fin);

  1302. 

  1303.         av_frame_free(&fin);

  1304.         av_audio_fifo_drain(s->fifo, s->hop_size);

  1305.         if (ret <= 0)

  1306.             return ret;

  1307.     }

  1308. 

  1309.     if (ff_outlink_get_status(inlink) == AVERROR_EOF &&

  1310.         s->sliding == FULLFRAME &&

  1311.         s->xpos > 0 && s->outpicref) {

  1312.         int64_t pts;

  1313. 

  1314.         if (s->orientation == VERTICAL) {

  1315.             for (int i = 0; i < outlink->h; i++) {

  1316.                 memset(s->outpicref->data[0] + i * s->outpicref->linesize[0] + s->xpos,   0, outlink->w - s->xpos);

  1317.                 memset(s->outpicref->data[1] + i * s->outpicref->linesize[1] + s->xpos, 128, outlink->w - s->xpos);

  1318.                 memset(s->outpicref->data[2] + i * s->outpicref->linesize[2] + s->xpos, 128, outlink->w - s->xpos);

  1319.             }

  1320.         } else {

  1321.             for (int i = s->xpos; i < outlink->h; i++) {

  1322.                 memset(s->outpicref->data[0] + i * s->outpicref->linesize[0],   0, outlink->w);

  1323.                 memset(s->outpicref->data[1] + i * s->outpicref->linesize[1], 128, outlink->w);

  1324.                 memset(s->outpicref->data[2] + i * s->outpicref->linesize[2], 128, outlink->w);

  1325.             }

  1326.         }

  1327.         s->outpicref->pts += s->consumed;

  1328.         pts = s->outpicref->pts;

  1329.         ret = ff_filter_frame(outlink, s->outpicref);

  1330.         s->outpicref = NULL;

  1331.         ff_outlink_set_status(outlink, AVERROR_EOF, pts);

  1332.         return 0;

  1333.     }

  1334. 

  1335.     FF_FILTER_FORWARD_STATUS(inlink, outlink);

  1336.     if (ff_outlink_frame_wanted(outlink) && av_audio_fifo_size(s->fifo) < s->win_size) {

  1337.         ff_inlink_request_frame(inlink);

  1338.         return 0;

  1339.     }

  1340. 

  1341.     if (av_audio_fifo_size(s->fifo) >= s->win_size) {

  1342.         ff_filter_set_ready(ctx, 10);

  1343.         return 0;

  1344.     }

  1345.     return FFERROR_NOT_READY;

  1346. }

  1347. 

  1348. static const AVFilterPad showspectrum_inputs[] = {

  1349.     {

  1350.         .name         = "default",

  1351.         .type         = AVMEDIA_TYPE_AUDIO,

  1352.     },

  1353.     { NULL }

  1354. };

  1355. 

  1356. static const AVFilterPad showspectrum_outputs[] = {

  1357.     {

  1358.         .name          = "default",

  1359.         .type          = AVMEDIA_TYPE_VIDEO,

  1360.         .config_props  = config_output,

  1361.     },

  1362.     { NULL }

  1363. };

  1364. 

  1365. AVFilter ff_avf_showspectrum = {

  1366.     .name          = "showspectrum",

  1367.     .description   = NULL_IF_CONFIG_SMALL("Convert input audio to a spectrum video output."),

  1368.     .uninit        = uninit,

  1369.     .query_formats = query_formats,

  1370.     .priv_size     = sizeof(ShowSpectrumContext),

  1371.     .inputs        = showspectrum_inputs,

  1372.     .outputs       = showspectrum_outputs,

  1373.     .activate      = activate,

  1374.     .priv_class    = &showspectrum_class,

  1375.     .flags         = AVFILTER_FLAG_SLICE_THREADS,

  1376. };

  1377. #endif // CONFIG_SHOWSPECTRUM_FILTER

  1378. 

  1379. #if CONFIG_SHOWSPECTRUMPIC_FILTER

  1380. 

  1381. static const AVOption showspectrumpic_options[] = {

  1382.     { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "4096x2048"}, 0, 0, FLAGS },

  1383.     { "s",    "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "4096x2048"}, 0, 0, FLAGS },

  1384.     { "mode", "set channel display mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=COMBINED}, 0, NB_MODES-1, FLAGS, "mode" },

  1385.         { "combined", "combined mode", 0, AV_OPT_TYPE_CONST, {.i64=COMBINED}, 0, 0, FLAGS, "mode" },

  1386.         { "separate", "separate mode", 0, AV_OPT_TYPE_CONST, {.i64=SEPARATE}, 0, 0, FLAGS, "mode" },

  1387.     { "color", "set channel coloring", OFFSET(color_mode), AV_OPT_TYPE_INT, {.i64=INTENSITY}, 0, NB_CLMODES-1, FLAGS, "color" },

  1388.         { "channel",   "separate color for each channel", 0, AV_OPT_TYPE_CONST, {.i64=CHANNEL},   0, 0, FLAGS, "color" },

  1389.         { "intensity", "intensity based coloring",        0, AV_OPT_TYPE_CONST, {.i64=INTENSITY}, 0, 0, FLAGS, "color" },

  1390.         { "rainbow",   "rainbow based coloring",          0, AV_OPT_TYPE_CONST, {.i64=RAINBOW},   0, 0, FLAGS, "color" },

  1391.         { "moreland",  "moreland based coloring",         0, AV_OPT_TYPE_CONST, {.i64=MORELAND},  0, 0, FLAGS, "color" },

  1392.         { "nebulae",   "nebulae based coloring",          0, AV_OPT_TYPE_CONST, {.i64=NEBULAE},   0, 0, FLAGS, "color" },

  1393.         { "fire",      "fire based coloring",             0, AV_OPT_TYPE_CONST, {.i64=FIRE},      0, 0, FLAGS, "color" },

  1394.         { "fiery",     "fiery based coloring",            0, AV_OPT_TYPE_CONST, {.i64=FIERY},     0, 0, FLAGS, "color" },

  1395.         { "fruit",     "fruit based coloring",            0, AV_OPT_TYPE_CONST, {.i64=FRUIT},     0, 0, FLAGS, "color" },

  1396.         { "cool",      "cool based coloring",             0, AV_OPT_TYPE_CONST, {.i64=COOL},      0, 0, FLAGS, "color" },

  1397.         { "magma",     "magma based coloring",            0, AV_OPT_TYPE_CONST, {.i64=MAGMA},     0, 0, FLAGS, "color" },

  1398.         { "green",     "green based coloring",            0, AV_OPT_TYPE_CONST, {.i64=GREEN},     0, 0, FLAGS, "color" },

  1399.     { "scale", "set display scale", OFFSET(scale), AV_OPT_TYPE_INT, {.i64=LOG}, 0, NB_SCALES-1, FLAGS, "scale" },

  1400.         { "lin",  "linear",      0, AV_OPT_TYPE_CONST, {.i64=LINEAR}, 0, 0, FLAGS, "scale" },

  1401.         { "sqrt", "square root", 0, AV_OPT_TYPE_CONST, {.i64=SQRT},   0, 0, FLAGS, "scale" },

  1402.         { "cbrt", "cubic root",  0, AV_OPT_TYPE_CONST, {.i64=CBRT},   0, 0, FLAGS, "scale" },

  1403.         { "log",  "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=LOG},    0, 0, FLAGS, "scale" },

  1404.         { "4thrt","4th root",    0, AV_OPT_TYPE_CONST, {.i64=FOURTHRT}, 0, 0, FLAGS, "scale" },

  1405.         { "5thrt","5th root",    0, AV_OPT_TYPE_CONST, {.i64=FIFTHRT},  0, 0, FLAGS, "scale" },

  1406.     { "saturation", "color saturation multiplier", OFFSET(saturation), AV_OPT_TYPE_FLOAT, {.dbl = 1}, -10, 10, FLAGS },

  1407.     { "win_func", "set window function", OFFSET(win_func), AV_OPT_TYPE_INT, {.i64 = WFUNC_HANNING}, 0, NB_WFUNC-1, FLAGS, "win_func" },

  1408.         { "rect",     "Rectangular",      0, AV_OPT_TYPE_CONST, {.i64=WFUNC_RECT},     0, 0, FLAGS, "win_func" },

  1409.         { "bartlett", "Bartlett",         0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BARTLETT}, 0, 0, FLAGS, "win_func" },

  1410.         { "hann",     "Hann",             0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HANNING},  0, 0, FLAGS, "win_func" },

  1411.         { "hanning",  "Hanning",          0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HANNING},  0, 0, FLAGS, "win_func" },

  1412.         { "hamming",  "Hamming",          0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HAMMING},  0, 0, FLAGS, "win_func" },

  1413.         { "blackman", "Blackman",         0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BLACKMAN}, 0, 0, FLAGS, "win_func" },

  1414.         { "welch",    "Welch",            0, AV_OPT_TYPE_CONST, {.i64=WFUNC_WELCH},    0, 0, FLAGS, "win_func" },

  1415.         { "flattop",  "Flat-top",         0, AV_OPT_TYPE_CONST, {.i64=WFUNC_FLATTOP},  0, 0, FLAGS, "win_func" },

  1416.         { "bharris",  "Blackman-Harris",  0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHARRIS},  0, 0, FLAGS, "win_func" },

  1417.         { "bnuttall", "Blackman-Nuttall", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BNUTTALL}, 0, 0, FLAGS, "win_func" },

  1418.         { "bhann",    "Bartlett-Hann",    0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHANN},    0, 0, FLAGS, "win_func" },

  1419.         { "sine",     "Sine",             0, AV_OPT_TYPE_CONST, {.i64=WFUNC_SINE},     0, 0, FLAGS, "win_func" },

  1420.         { "nuttall",  "Nuttall",          0, AV_OPT_TYPE_CONST, {.i64=WFUNC_NUTTALL},  0, 0, FLAGS, "win_func" },

  1421.         { "lanczos",  "Lanczos",          0, AV_OPT_TYPE_CONST, {.i64=WFUNC_LANCZOS},  0, 0, FLAGS, "win_func" },

  1422.         { "gauss",    "Gauss",            0, AV_OPT_TYPE_CONST, {.i64=WFUNC_GAUSS},    0, 0, FLAGS, "win_func" },

  1423.         { "tukey",    "Tukey",            0, AV_OPT_TYPE_CONST, {.i64=WFUNC_TUKEY},    0, 0, FLAGS, "win_func" },

  1424.         { "dolph",    "Dolph-Chebyshev",  0, AV_OPT_TYPE_CONST, {.i64=WFUNC_DOLPH},    0, 0, FLAGS, "win_func" },

  1425.         { "cauchy",   "Cauchy",           0, AV_OPT_TYPE_CONST, {.i64=WFUNC_CAUCHY},   0, 0, FLAGS, "win_func" },

  1426.         { "parzen",   "Parzen",           0, AV_OPT_TYPE_CONST, {.i64=WFUNC_PARZEN},   0, 0, FLAGS, "win_func" },

  1427.         { "poisson",  "Poisson",          0, AV_OPT_TYPE_CONST, {.i64=WFUNC_POISSON},  0, 0, FLAGS, "win_func" },

  1428.     { "orientation", "set orientation", OFFSET(orientation), AV_OPT_TYPE_INT, {.i64=VERTICAL}, 0, NB_ORIENTATIONS-1, FLAGS, "orientation" },

  1429.         { "vertical",   NULL, 0, AV_OPT_TYPE_CONST, {.i64=VERTICAL},   0, 0, FLAGS, "orientation" },

  1430.         { "horizontal", NULL, 0, AV_OPT_TYPE_CONST, {.i64=HORIZONTAL}, 0, 0, FLAGS, "orientation" },

  1431.     { "gain", "set scale gain", OFFSET(gain), AV_OPT_TYPE_FLOAT, {.dbl = 1}, 0, 128, FLAGS },

  1432.     { "legend", "draw legend", OFFSET(legend), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, FLAGS },

  1433.     { "rotation", "color rotation", OFFSET(rotation), AV_OPT_TYPE_FLOAT, {.dbl = 0}, -1, 1, FLAGS },

  1434.     { "start", "start frequency", OFFSET(start), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT32_MAX, FLAGS },

  1435.     { "stop",  "stop frequency",  OFFSET(stop),  AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT32_MAX, FLAGS },

  1436.     { NULL }

  1437. };

  1438. 

  1439. AVFILTER_DEFINE_CLASS(showspectrumpic);

  1440. 

  1441. static int showspectrumpic_request_frame(AVFilterLink *outlink)

  1442. {

  1443.     AVFilterContext *ctx = outlink->src;

  1444.     ShowSpectrumContext *s = ctx->priv;

  1445.     AVFilterLink *inlink = ctx->inputs[0];

  1446.     int ret, samples;

  1447. 

  1448.     ret = ff_request_frame(inlink);

  1449.     samples = av_audio_fifo_size(s->fifo);

  1450.     if (ret == AVERROR_EOF && s->outpicref && samples > 0) {

  1451.         int consumed = 0;

  1452.         int x = 0, sz = s->orientation == VERTICAL ? s->w : s->h;

  1453.         int ch, spf, spb;

  1454.         AVFrame *fin;

  1455. 

  1456.         spf = s->win_size * (samples / ((s->win_size * sz) * ceil(samples / (float)(s->win_size * sz))));

  1457.         spf = FFMAX(1, spf);

  1458. 

  1459.         spb = (samples / (spf * sz)) * spf;

  1460. 

  1461.         fin = ff_get_audio_buffer(inlink, s->win_size);

  1462.         if (!fin)

  1463.             return AVERROR(ENOMEM);

  1464. 

  1465.         while (x < sz) {

  1466.             ret = av_audio_fifo_peek(s->fifo, (void **)fin->extended_data, s->win_size);

  1467.             if (ret < 0) {

  1468.                 av_frame_free(&fin);

  1469.                 return ret;

  1470.             }

  1471. 

  1472.             av_audio_fifo_drain(s->fifo, spf);

  1473. 

  1474.             if (ret < s->win_size) {

  1475.                 for (ch = 0; ch < s->nb_display_channels; ch++) {

  1476.                     memset(fin->extended_data[ch] + ret * sizeof(float), 0,

  1477.                            (s->win_size - ret) * sizeof(float));

  1478.                 }

  1479.             }

  1480. 

  1481.             ctx->internal->execute(ctx, run_channel_fft, fin, NULL, s->nb_display_channels);

  1482.             acalc_magnitudes(s);

  1483. 

  1484.             consumed += spf;

  1485.             if (consumed >= spb) {

  1486.                 int h = s->orientation == VERTICAL ? s->h : s->w;

  1487. 

  1488.                 scale_magnitudes(s, 1. / (consumed / spf));

  1489.                 plot_spectrum_column(inlink, fin);

  1490.                 consumed = 0;

  1491.                 x++;

  1492.                 for (ch = 0; ch < s->nb_display_channels; ch++)

  1493.                     memset(s->magnitudes[ch], 0, h * sizeof(float));

  1494.             }

  1495.         }

  1496. 

  1497.         av_frame_free(&fin);

  1498.         s->outpicref->pts = 0;

  1499. 

  1500.         if (s->legend)

  1501.             draw_legend(ctx, samples);

  1502. 

  1503.         ret = ff_filter_frame(outlink, s->outpicref);

  1504.         s->outpicref = NULL;

  1505.     }

  1506. 

  1507.     return ret;

  1508. }

  1509. 

  1510. static int showspectrumpic_filter_frame(AVFilterLink *inlink, AVFrame *insamples)

  1511. {

  1512.     AVFilterContext *ctx = inlink->dst;

  1513.     ShowSpectrumContext *s = ctx->priv;

  1514.     int ret;

  1515. 

  1516.     ret = av_audio_fifo_write(s->fifo, (void **)insamples->extended_data, insamples->nb_samples);

  1517.     av_frame_free(&insamples);

  1518.     return ret;

  1519. }

  1520. 

  1521. static const AVFilterPad showspectrumpic_inputs[] = {

  1522.     {

  1523.         .name         = "default",

  1524.         .type         = AVMEDIA_TYPE_AUDIO,

  1525.         .filter_frame = showspectrumpic_filter_frame,

  1526.     },

  1527.     { NULL }

  1528. };

  1529. 

  1530. static const AVFilterPad showspectrumpic_outputs[] = {

  1531.     {

  1532.         .name          = "default",

  1533.         .type          = AVMEDIA_TYPE_VIDEO,

  1534.         .config_props  = config_output,

  1535.         .request_frame = showspectrumpic_request_frame,

  1536.     },

  1537.     { NULL }

  1538. };

  1539. 

  1540. AVFilter ff_avf_showspectrumpic = {

  1541.     .name          = "showspectrumpic",

  1542.     .description   = NULL_IF_CONFIG_SMALL("Convert input audio to a spectrum video output single picture."),

  1543.     .uninit        = uninit,

  1544.     .query_formats = query_formats,

  1545.     .priv_size     = sizeof(ShowSpectrumContext),

  1546.     .inputs        = showspectrumpic_inputs,

  1547.     .outputs       = showspectrumpic_outputs,

  1548.     .priv_class    = &showspectrumpic_class,

  1549.     .flags         = AVFILTER_FLAG_SLICE_THREADS,

  1550. };

  1551. 

  1552. #endif // CONFIG_SHOWSPECTRUMPIC_FILTER