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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/xga_font_data.h"

  38. #include "audio.h"

  39. #include "video.h"

  40. #include "avfilter.h"

  41. #include "internal.h"

  42. #include "window_func.h"

  43. 

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

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

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

  47. enum ColorMode    { CHANNEL, INTENSITY, RAINBOW, MORELAND, NEBULAE, FIRE, FIERY, FRUIT, COOL, MAGMA, NB_CLMODES };

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

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

  50. 

  51. typedef struct ShowSpectrumContext {

  52.     const AVClass *class;

  53.     int w, h;

  54.     AVFrame *outpicref;

  55.     int nb_display_channels;

  56.     int orientation;

  57.     int channel_width;

  58.     int channel_height;

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

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

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

  62.     int scale;

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

  64.     float rotation;             ///< color rotation

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

  66.     int data;

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

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

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

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

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

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

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

  74.     float **magnitudes;

  75.     float **phases;

  76.     int win_func;

  77.     int win_size;

  78.     int buf_size;

  79.     double win_scale;

  80.     float overlap;

  81.     float gain;

  82.     int hop_size;

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

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

  85.     AVAudioFifo *fifo;

  86.     int64_t pts;

  87.     int single_pic;

  88.     int legend;

  89.     int start_x, start_y;

  90. } ShowSpectrumContext;

  91. 

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

  93. #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

  94. 

  95. static const AVOption showspectrum_options[] = {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  122.         { "4thrt","4th root",    0, AV_OPT_TYPE_CONST, {.i64=FOURTHRT}, 0, 0, FLAGS, "scale" },

  123.         { "5thrt","5th root",    0, AV_OPT_TYPE_CONST, {.i64=FIFTHRT},  0, 0, FLAGS, "scale" },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  157.     { NULL }

  158. };

  159. 

  160. AVFILTER_DEFINE_CLASS(showspectrum);

  161. 

  162. static const struct ColorTable {

  163.     float a, y, u, v;

  164. } color_table[][8] = {

  165.     [INTENSITY] = {

  166.     {    0,                  0,                  0,                   0 },

  167.     { 0.13, .03587126228984074,  .1573300977624594, -.02548747583751842 },

  168.     { 0.30, .18572281794568020,  .1772436246393981,  .17475554840414750 },

  169.     { 0.60, .28184980583656130, -.1593064119945782,  .47132074554608920 },

  170.     { 0.73, .65830621175547810, -.3716070802232764,  .24352759331252930 },

  171.     { 0.78, .76318535758242900, -.4307467689263783,  .16866496622310430 },

  172.     { 0.91, .95336363636363640, -.2045454545454546,  .03313636363636363 },

  173.     {    1,                  1,                  0,                   0 }},

  174.     [RAINBOW] = {

  175.     {    0,                  0,                  0,                   0 },

  176.     { 0.13,            44/256.,     (189-128)/256.,      (138-128)/256. },

  177.     { 0.25,            29/256.,     (186-128)/256.,      (119-128)/256. },

  178.     { 0.38,           119/256.,     (194-128)/256.,       (53-128)/256. },

  179.     { 0.60,           111/256.,      (73-128)/256.,       (59-128)/256. },

  180.     { 0.73,           205/256.,      (19-128)/256.,      (149-128)/256. },

  181.     { 0.86,           135/256.,      (83-128)/256.,      (200-128)/256. },

  182.     {    1,            73/256.,      (95-128)/256.,      (225-128)/256. }},

  183.     [MORELAND] = {

  184.     {    0,            44/256.,     (181-128)/256.,      (112-128)/256. },

  185.     { 0.13,           126/256.,     (177-128)/256.,      (106-128)/256. },

  186.     { 0.25,           164/256.,     (163-128)/256.,      (109-128)/256. },

  187.     { 0.38,           200/256.,     (140-128)/256.,      (120-128)/256. },

  188.     { 0.60,           201/256.,     (117-128)/256.,      (141-128)/256. },

  189.     { 0.73,           177/256.,     (103-128)/256.,      (165-128)/256. },

  190.     { 0.86,           136/256.,     (100-128)/256.,      (183-128)/256. },

  191.     {    1,            68/256.,     (117-128)/256.,      (203-128)/256. }},

  192.     [NEBULAE] = {

  193.     {    0,            10/256.,     (134-128)/256.,      (132-128)/256. },

  194.     { 0.23,            21/256.,     (137-128)/256.,      (130-128)/256. },

  195.     { 0.45,            35/256.,     (134-128)/256.,      (134-128)/256. },

  196.     { 0.57,            51/256.,     (130-128)/256.,      (139-128)/256. },

  197.     { 0.67,           104/256.,     (116-128)/256.,      (162-128)/256. },

  198.     { 0.77,           120/256.,     (105-128)/256.,      (188-128)/256. },

  199.     { 0.87,           140/256.,     (105-128)/256.,      (188-128)/256. },

  200.     {    1,                  1,                  0,                   0 }},

  201.     [FIRE] = {

  202.     {    0,                  0,                  0,                   0 },

  203.     { 0.23,            44/256.,     (132-128)/256.,      (127-128)/256. },

  204.     { 0.45,            62/256.,     (116-128)/256.,      (140-128)/256. },

  205.     { 0.57,            75/256.,     (105-128)/256.,      (152-128)/256. },

  206.     { 0.67,            95/256.,      (91-128)/256.,      (166-128)/256. },

  207.     { 0.77,           126/256.,      (74-128)/256.,      (172-128)/256. },

  208.     { 0.87,           164/256.,      (73-128)/256.,      (162-128)/256. },

  209.     {    1,                  1,                  0,                   0 }},

  210.     [FIERY] = {

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

  212.     { 0.23,            36/256.,     (116-128)/256.,      (163-128)/256. },

  213.     { 0.45,            52/256.,     (102-128)/256.,      (200-128)/256. },

  214.     { 0.57,           116/256.,      (84-128)/256.,      (196-128)/256. },

  215.     { 0.67,           157/256.,      (67-128)/256.,      (181-128)/256. },

  216.     { 0.77,           193/256.,      (40-128)/256.,      (155-128)/256. },

  217.     { 0.87,           221/256.,     (101-128)/256.,      (134-128)/256. },

  218.     {    1,                  1,                  0,                   0 }},

  219.     [FRUIT] = {

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

  221.     { 0.20,            29/256.,     (136-128)/256.,      (119-128)/256. },

  222.     { 0.30,            60/256.,     (119-128)/256.,       (90-128)/256. },

  223.     { 0.40,            85/256.,      (91-128)/256.,       (85-128)/256. },

  224.     { 0.50,           116/256.,      (70-128)/256.,      (105-128)/256. },

  225.     { 0.60,           151/256.,      (50-128)/256.,      (146-128)/256. },

  226.     { 0.70,           191/256.,      (63-128)/256.,      (178-128)/256. },

  227.     {    1,            98/256.,      (80-128)/256.,      (221-128)/256. }},

  228.     [COOL] = {

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

  230.     {  .15,                  0,                 .5,                 -.5 },

  231.     {    1,                  1,                -.5,                  .5 }},

  232.     [MAGMA] = {

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

  234.     { 0.10,            23/256.,     (175-128)/256.,      (120-128)/256. },

  235.     { 0.23,            43/256.,     (158-128)/256.,      (144-128)/256. },

  236.     { 0.35,            85/256.,     (138-128)/256.,      (179-128)/256. },

  237.     { 0.48,            96/256.,     (128-128)/256.,      (189-128)/256. },

  238.     { 0.64,           128/256.,     (103-128)/256.,      (214-128)/256. },

  239.     { 0.78,           167/256.,      (85-128)/256.,      (174-128)/256. },

  240.     {    1,           205/256.,      (80-128)/256.,      (152-128)/256. }},

  241. };

  242. 

  243. static av_cold void uninit(AVFilterContext *ctx)

  244. {

  245.     ShowSpectrumContext *s = ctx->priv;

  246.     int i;

  247. 

  248.     av_freep(&s->combine_buffer);

  249.     if (s->fft) {

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

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

  252.     }

  253.     av_freep(&s->fft);

  254.     if (s->ifft) {

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

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

  257.     }

  258.     av_freep(&s->ifft);

  259.     if (s->fft_data) {

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

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

  262.     }

  263.     av_freep(&s->fft_data);

  264.     if (s->fft_scratch) {

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

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

  267.     }

  268.     av_freep(&s->fft_scratch);

  269.     if (s->color_buffer) {

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

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

  272.     }

  273.     av_freep(&s->color_buffer);

  274.     av_freep(&s->window_func_lut);

  275.     if (s->magnitudes) {

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

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

  278.     }

  279.     av_freep(&s->magnitudes);

  280.     av_frame_free(&s->outpicref);

  281.     av_audio_fifo_free(s->fifo);

  282.     if (s->phases) {

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

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

  285.     }

  286.     av_freep(&s->phases);

  287. }

  288. 

  289. static int query_formats(AVFilterContext *ctx)

  290. {

  291.     AVFilterFormats *formats = NULL;

  292.     AVFilterChannelLayouts *layouts = NULL;

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

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

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

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

  297.     int ret;

  298. 

  299.     /* set input audio formats */

  300.     formats = ff_make_format_list(sample_fmts);

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

  302.         return ret;

  303. 

  304.     layouts = ff_all_channel_layouts();

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

  306.         return ret;

  307. 

  308.     formats = ff_all_samplerates();

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

  310.         return ret;

  311. 

  312.     /* set output video format */

  313.     formats = ff_make_format_list(pix_fmts);

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

  315.         return ret;

  316. 

  317.     return 0;

  318. }

  319. 

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

  321. {

  322.     ShowSpectrumContext *s = ctx->priv;

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

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

  325.     AVFrame *fin = arg;

  326.     const int ch = jobnr;

  327.     int n;

  328. 

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

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

  331. 

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

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

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

  335.     }

  336. 

  337.     if (s->stop) {

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

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

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

  341.         int L = s->buf_size;

  342.         int N = s->win_size;

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

  344. 

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

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

  347. 

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

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

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

  351.         }

  352. 

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

  354.             h[n].re = 0.0;

  355.             h[n].im = 0.0;

  356.         }

  357. 

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

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

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

  361.         }

  362. 

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

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

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

  366.         }

  367. 

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

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

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

  371.         }

  372. 

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

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

  375.             c =  cos(psi);

  376.             S = -sin(psi);

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

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

  379.             g[n].re = a;

  380.             g[n].im = b;

  381.         }

  382. 

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

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

  385. 

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

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

  388. 

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

  390.             c = g[n].re;

  391.             S = g[n].im;

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

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

  394. 

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

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

  397.         }

  398. 

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

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

  401. 

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

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

  404.             c =  cos(psi);

  405.             S = -sin(psi);

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

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

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

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

  410.         }

  411.     } else {

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

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

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

  415.     }

  416. 

  417.     return 0;

  418. }

  419. 

  420. static int config_output(AVFilterLink *outlink)

  421. {

  422.     AVFilterContext *ctx = outlink->src;

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

  424.     ShowSpectrumContext *s = ctx->priv;

  425.     int i, fft_bits, h, w;

  426.     float overlap;

  427. 

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

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

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

  431.         return AVERROR(EINVAL);

  432.     }

  433. 

  434.     s->pts = AV_NOPTS_VALUE;

  435. 

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

  437.         s->single_pic = 1;

  438. 

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

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

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

  442. 

  443.     if (s->legend) {

  444.         s->start_x = log10(inlink->sample_rate) * 25;

  445.         s->start_y = 64;

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

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

  448.     }

  449. 

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

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

  452.     s->channel_height = h;

  453.     s->channel_width  = w;

  454. 

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

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

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

  458.     } else {

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

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

  461.     }

  462. 

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

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

  465. 

  466.     if (!s->fft) {

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

  468.         if (!s->fft)

  469.             return AVERROR(ENOMEM);

  470.     }

  471. 

  472.     if (s->stop) {

  473.         if (!s->ifft) {

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

  475.             if (!s->ifft)

  476.                 return AVERROR(ENOMEM);

  477.         }

  478.     }

  479. 

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

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

  482.         AVFrame *outpicref;

  483. 

  484.         s->fft_bits = fft_bits;

  485. 

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

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

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

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

  490.             if (s->stop) {

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

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

  493.             }

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

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

  496.         }

  497.         av_freep(&s->fft_data);

  498. 

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

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

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

  502.             if (s->stop) {

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

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

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

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

  507.                     return AVERROR(EINVAL);

  508.                 }

  509.             }

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

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

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

  513.                 return AVERROR(EINVAL);

  514.             }

  515.         }

  516. 

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

  518.         if (!s->magnitudes)

  519.             return AVERROR(ENOMEM);

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

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

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

  523.                 return AVERROR(ENOMEM);

  524.         }

  525. 

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

  527.         if (!s->phases)

  528.             return AVERROR(ENOMEM);

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

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

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

  532.                 return AVERROR(ENOMEM);

  533.         }

  534. 

  535.         av_freep(&s->color_buffer);

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

  537.         if (!s->color_buffer)

  538.             return AVERROR(ENOMEM);

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

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

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

  542.                 return AVERROR(ENOMEM);

  543.         }

  544. 

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

  546.         if (!s->fft_data)

  547.             return AVERROR(ENOMEM);

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

  549.         if (!s->fft_scratch)

  550.             return AVERROR(ENOMEM);

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

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

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

  554.                 return AVERROR(ENOMEM);

  555. 

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

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

  558.                 return AVERROR(ENOMEM);

  559.         }

  560. 

  561.         /* pre-calc windowing function */

  562.         s->window_func_lut =

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

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

  565.         if (!s->window_func_lut)

  566.             return AVERROR(ENOMEM);

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

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

  569.             s->overlap = overlap;

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

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

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

  573.             return AVERROR(EINVAL);

  574.         }

  575. 

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

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

  578.         }

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

  580. 

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

  582.         av_frame_free(&s->outpicref);

  583.         s->outpicref = outpicref =

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

  585.         if (!outpicref)

  586.             return AVERROR(ENOMEM);

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

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

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

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

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

  592.         }

  593.         outpicref->color_range = AVCOL_RANGE_JPEG;

  594.     }

  595. 

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

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

  598.         s->xpos = 0;

  599. 

  600.     outlink->frame_rate = av_make_q(inlink->sample_rate, s->win_size * (1.-s->overlap));

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

  602.         outlink->frame_rate.den *= s->w;

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

  604.         outlink->frame_rate.den *= s->h;

  605. 

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

  607.         s->combine_buffer =

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

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

  610.     } else {

  611.         s->combine_buffer =

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

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

  614.     }

  615. 

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

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

  618. 

  619.     av_audio_fifo_free(s->fifo);

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

  621.     if (!s->fifo)

  622.         return AVERROR(ENOMEM);

  623.     return 0;

  624. }

  625. 

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

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

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

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

  630. 

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

  632. {

  633.     ShowSpectrumContext *s = ctx->priv;

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

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

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

  637.     const int ch = jobnr;

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

  639. 

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

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

  642. 

  643.     return 0;

  644. }

  645. 

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

  647. {

  648.     ShowSpectrumContext *s = ctx->priv;

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

  650.     const int ch = jobnr;

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

  652.     int y;

  653. 

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

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

  656. 

  657.     return 0;

  658. }

  659. 

  660. static void acalc_magnitudes(ShowSpectrumContext *s)

  661. {

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

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

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

  665. 

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

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

  668. 

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

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

  671.     }

  672. }

  673. 

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

  675. {

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

  677. 

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

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

  680. 

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

  682.             magnitudes[y] *= scale;

  683.     }

  684. }

  685. 

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

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

  688. {

  689.     switch (s->mode) {

  690.     case COMBINED:

  691.         // reduce range by channel count

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

  693.         switch (s->color_mode) {

  694.         case RAINBOW:

  695.         case MORELAND:

  696.         case NEBULAE:

  697.         case FIRE:

  698.         case FIERY:

  699.         case FRUIT:

  700.         case COOL:

  701.         case MAGMA:

  702.         case INTENSITY:

  703.             *uf = *yf;

  704.             *vf = *yf;

  705.             break;

  706.         case CHANNEL:

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

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

  709.             *uf = *yf * M_PI;

  710.             *vf = *yf * M_PI;

  711.             break;

  712.         default:

  713.             av_assert0(0);

  714.         }

  715.         break;

  716.     case SEPARATE:

  717.         // full range

  718.         *yf = 256.0f;

  719.         *uf = 256.0f;

  720.         *vf = 256.0f;

  721.         break;

  722.     default:

  723.         av_assert0(0);

  724.     }

  725. 

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

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

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

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

  730.         } else {

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

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

  733.         }

  734.     } else {

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

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

  737.     }

  738. 

  739.     *uf *= s->saturation;

  740.     *vf *= s->saturation;

  741. }

  742. 

  743. static void pick_color(ShowSpectrumContext *s,

  744.                        float yf, float uf, float vf,

  745.                        float a, float *out)

  746. {

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

  748.         const int cm = s->color_mode;

  749.         float y, u, v;

  750.         int i;

  751. 

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

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

  754.                 break;

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

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

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

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

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

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

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

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

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

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

  765.         } else {

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

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

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

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

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

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

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

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

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

  775.         }

  776. 

  777.         out[0] = y * yf;

  778.         out[1] = u * uf;

  779.         out[2] = v * vf;

  780.     } else {

  781.         out[0] = a * yf;

  782.         out[1] = a * uf;

  783.         out[2] = a * vf;

  784.     }

  785. }

  786. 

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

  788. {

  789.     int y;

  790. 

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

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

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

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

  795.     }

  796. }

  797. 

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

  799. {

  800.     ShowSpectrumContext *s = ctx->priv;

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

  802.     const int ch = jobnr;

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

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

  805.     float yf, uf, vf;

  806.     int y;

  807. 

  808.     /* decide color range */

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

  810. 

  811.     /* draw the channel */

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

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

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

  815.         float a;

  816. 

  817.         switch (s->data) {

  818.         case D_MAGNITUDE:

  819.             /* get magnitude */

  820.             a = magnitudes[y];

  821.             break;

  822.         case D_PHASE:

  823.             /* get phase */

  824.             a = phases[y];

  825.             break;

  826.         default:

  827.             av_assert0(0);

  828.         }

  829. 

  830.         /* apply scale */

  831.         switch (s->scale) {

  832.         case LINEAR:

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

  834.             break;

  835.         case SQRT:

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

  837.             break;

  838.         case CBRT:

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

  840.             break;

  841.         case FOURTHRT:

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

  843.             break;

  844.         case FIFTHRT:

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

  846.             break;

  847.         case LOG:

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

  849.             break;

  850.         default:

  851.             av_assert0(0);

  852.         }

  853. 

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

  855.     }

  856. 

  857.     return 0;

  858. }

  859. 

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

  861. {

  862.     AVFilterContext *ctx = inlink->dst;

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

  864.     ShowSpectrumContext *s = ctx->priv;

  865.     AVFrame *outpicref = s->outpicref;

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

  867. 

  868.     /* fill a new spectrum column */

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

  870.     clear_combine_buffer(s, z);

  871. 

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

  873. 

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

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

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

  877.         }

  878.     }

  879. 

  880.     av_frame_make_writable(s->outpicref);

  881.     /* copy to output */

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

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

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

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

  886.                     uint8_t *p = outpicref->data[plane] +

  887.                                  y * outpicref->linesize[plane];

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

  889.                 }

  890.             }

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

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

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

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

  895.                     uint8_t *p = outpicref->data[plane] +

  896.                                  y * outpicref->linesize[plane];

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

  898.                 }

  899.             }

  900.             s->xpos = 0;

  901.         }

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

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

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

  905.                          s->xpos;

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

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

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

  909.             }

  910.         }

  911.     } else {

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

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

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

  915.                     memmove(outpicref->data[plane] + (y-1) * outpicref->linesize[plane],

  916.                             outpicref->data[plane] + (y  ) * outpicref->linesize[plane],

  917.                             s->w);

  918.                 }

  919.             }

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

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

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

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

  924.                     memmove(outpicref->data[plane] + (y  ) * outpicref->linesize[plane],

  925.                             outpicref->data[plane] + (y-1) * outpicref->linesize[plane],

  926.                             s->w);

  927.                 }

  928.             }

  929.             s->xpos = 0;

  930.         }

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

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

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

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

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

  936.                 p++;

  937.             }

  938.         }

  939.     }

  940. 

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

  942.         outpicref->pts = insamples->pts;

  943. 

  944.     s->xpos++;

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

  946.         s->xpos = 0;

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

  948.         s->xpos = 0;

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

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

  951.         if (ret < 0)

  952.             return ret;

  953.     }

  954. 

  955.     return s->win_size;

  956. }

  957. 

  958. #if CONFIG_SHOWSPECTRUM_FILTER

  959. 

  960. static int request_frame(AVFilterLink *outlink)

  961. {

  962.     ShowSpectrumContext *s = outlink->src->priv;

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

  964.     unsigned i;

  965.     int ret;

  966. 

  967.     ret = ff_request_frame(inlink);

  968.     if (ret == AVERROR_EOF && s->sliding == FULLFRAME && s->xpos > 0 &&

  969.         s->outpicref) {

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

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

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

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

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

  975.             }

  976.         } else {

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

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

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

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

  981.             }

  982.         }

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

  984.         s->outpicref = NULL;

  985.     }

  986. 

  987.     return ret;

  988. }

  989. 

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

  991. {

  992.     AVFilterContext *ctx = inlink->dst;

  993.     ShowSpectrumContext *s = ctx->priv;

  994.     AVFrame *fin = NULL;

  995.     int ret = 0, consumed = 0;

  996. 

  997.     if (s->pts == AV_NOPTS_VALUE)

  998.         s->pts = insamples->pts - av_audio_fifo_size(s->fifo);

  999. 

  1000.     av_audio_fifo_write(s->fifo, (void **)insamples->extended_data, insamples->nb_samples);

  1001.     av_frame_free(&insamples);

  1002.     while (av_audio_fifo_size(s->fifo) >= s->win_size) {

  1003.         fin = ff_get_audio_buffer(inlink, s->win_size);

  1004.         if (!fin) {

  1005.             ret = AVERROR(ENOMEM);

  1006.             goto fail;

  1007.         }

  1008. 

  1009.         fin->pts = s->pts + consumed;

  1010.         consumed += s->hop_size;

  1011.         ret = av_audio_fifo_peek(s->fifo, (void **)fin->extended_data, s->win_size);

  1012.         if (ret < 0)

  1013.             goto fail;

  1014. 

  1015.         av_assert0(fin->nb_samples == s->win_size);

  1016. 

  1017.         ctx->internal->execute(ctx, run_channel_fft, fin, NULL, s->nb_display_channels);

  1018. 

  1019.         if (s->data == D_MAGNITUDE)

  1020.             ctx->internal->execute(ctx, calc_channel_magnitudes, NULL, NULL, s->nb_display_channels);

  1021. 

  1022.         if (s->data == D_PHASE)

  1023.             ctx->internal->execute(ctx, calc_channel_phases, NULL, NULL, s->nb_display_channels);

  1024. 

  1025.         ret = plot_spectrum_column(inlink, fin);

  1026.         av_frame_free(&fin);

  1027.         av_audio_fifo_drain(s->fifo, s->hop_size);

  1028.         if (ret < 0)

  1029.             goto fail;

  1030.     }

  1031. 

  1032. fail:

  1033.     s->pts = AV_NOPTS_VALUE;

  1034.     av_frame_free(&fin);

  1035.     return ret;

  1036. }

  1037. 

  1038. static const AVFilterPad showspectrum_inputs[] = {

  1039.     {

  1040.         .name         = "default",

  1041.         .type         = AVMEDIA_TYPE_AUDIO,

  1042.         .filter_frame = filter_frame,

  1043.     },

  1044.     { NULL }

  1045. };

  1046. 

  1047. static const AVFilterPad showspectrum_outputs[] = {

  1048.     {

  1049.         .name          = "default",

  1050.         .type          = AVMEDIA_TYPE_VIDEO,

  1051.         .config_props  = config_output,

  1052.         .request_frame = request_frame,

  1053.     },

  1054.     { NULL }

  1055. };

  1056. 

  1057. AVFilter ff_avf_showspectrum = {

  1058.     .name          = "showspectrum",

  1059.     .description   = NULL_IF_CONFIG_SMALL("Convert input audio to a spectrum video output."),

  1060.     .uninit        = uninit,

  1061.     .query_formats = query_formats,

  1062.     .priv_size     = sizeof(ShowSpectrumContext),

  1063.     .inputs        = showspectrum_inputs,

  1064.     .outputs       = showspectrum_outputs,

  1065.     .priv_class    = &showspectrum_class,

  1066.     .flags         = AVFILTER_FLAG_SLICE_THREADS,

  1067. };

  1068. #endif // CONFIG_SHOWSPECTRUM_FILTER

  1069. 

  1070. #if CONFIG_SHOWSPECTRUMPIC_FILTER

  1071. 

  1072. static const AVOption showspectrumpic_options[] = {

  1073.     { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "4096x2048"}, 0, 0, FLAGS },

  1074.     { "s",    "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "4096x2048"}, 0, 0, FLAGS },

  1075.     { "mode", "set channel display mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=COMBINED}, 0, NB_MODES-1, FLAGS, "mode" },

  1076.         { "combined", "combined mode", 0, AV_OPT_TYPE_CONST, {.i64=COMBINED}, 0, 0, FLAGS, "mode" },

  1077.         { "separate", "separate mode", 0, AV_OPT_TYPE_CONST, {.i64=SEPARATE}, 0, 0, FLAGS, "mode" },

  1078.     { "color", "set channel coloring", OFFSET(color_mode), AV_OPT_TYPE_INT, {.i64=INTENSITY}, 0, NB_CLMODES-1, FLAGS, "color" },

  1079.         { "channel",   "separate color for each channel", 0, AV_OPT_TYPE_CONST, {.i64=CHANNEL},   0, 0, FLAGS, "color" },

  1080.         { "intensity", "intensity based coloring",        0, AV_OPT_TYPE_CONST, {.i64=INTENSITY}, 0, 0, FLAGS, "color" },

  1081.         { "rainbow",   "rainbow based coloring",          0, AV_OPT_TYPE_CONST, {.i64=RAINBOW},   0, 0, FLAGS, "color" },

  1082.         { "moreland",  "moreland based coloring",         0, AV_OPT_TYPE_CONST, {.i64=MORELAND},  0, 0, FLAGS, "color" },

  1083.         { "nebulae",   "nebulae based coloring",          0, AV_OPT_TYPE_CONST, {.i64=NEBULAE},   0, 0, FLAGS, "color" },

  1084.         { "fire",      "fire based coloring",             0, AV_OPT_TYPE_CONST, {.i64=FIRE},      0, 0, FLAGS, "color" },

  1085.         { "fiery",     "fiery based coloring",            0, AV_OPT_TYPE_CONST, {.i64=FIERY},     0, 0, FLAGS, "color" },

  1086.         { "fruit",     "fruit based coloring",            0, AV_OPT_TYPE_CONST, {.i64=FRUIT},     0, 0, FLAGS, "color" },

  1087.         { "cool",      "cool based coloring",             0, AV_OPT_TYPE_CONST, {.i64=COOL},      0, 0, FLAGS, "color" },

  1088.         { "magma",     "magma based coloring",            0, AV_OPT_TYPE_CONST, {.i64=MAGMA},     0, 0, FLAGS, "color" },

  1089.     { "scale", "set display scale", OFFSET(scale), AV_OPT_TYPE_INT, {.i64=LOG}, 0, NB_SCALES-1, FLAGS, "scale" },

  1090.         { "lin",  "linear",      0, AV_OPT_TYPE_CONST, {.i64=LINEAR}, 0, 0, FLAGS, "scale" },

  1091.         { "sqrt", "square root", 0, AV_OPT_TYPE_CONST, {.i64=SQRT},   0, 0, FLAGS, "scale" },

  1092.         { "cbrt", "cubic root",  0, AV_OPT_TYPE_CONST, {.i64=CBRT},   0, 0, FLAGS, "scale" },

  1093.         { "log",  "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=LOG},    0, 0, FLAGS, "scale" },

  1094.         { "4thrt","4th root",    0, AV_OPT_TYPE_CONST, {.i64=FOURTHRT}, 0, 0, FLAGS, "scale" },

  1095.         { "5thrt","5th root",    0, AV_OPT_TYPE_CONST, {.i64=FIFTHRT},  0, 0, FLAGS, "scale" },

  1096.     { "saturation", "color saturation multiplier", OFFSET(saturation), AV_OPT_TYPE_FLOAT, {.dbl = 1}, -10, 10, FLAGS },

  1097.     { "win_func", "set window function", OFFSET(win_func), AV_OPT_TYPE_INT, {.i64 = WFUNC_HANNING}, 0, NB_WFUNC-1, FLAGS, "win_func" },

  1098.         { "rect",     "Rectangular",      0, AV_OPT_TYPE_CONST, {.i64=WFUNC_RECT},     0, 0, FLAGS, "win_func" },

  1099.         { "bartlett", "Bartlett",         0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BARTLETT}, 0, 0, FLAGS, "win_func" },

  1100.         { "hann",     "Hann",             0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HANNING},  0, 0, FLAGS, "win_func" },

  1101.         { "hanning",  "Hanning",          0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HANNING},  0, 0, FLAGS, "win_func" },

  1102.         { "hamming",  "Hamming",          0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HAMMING},  0, 0, FLAGS, "win_func" },

  1103.         { "blackman", "Blackman",         0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BLACKMAN}, 0, 0, FLAGS, "win_func" },

  1104.         { "welch",    "Welch",            0, AV_OPT_TYPE_CONST, {.i64=WFUNC_WELCH},    0, 0, FLAGS, "win_func" },

  1105.         { "flattop",  "Flat-top",         0, AV_OPT_TYPE_CONST, {.i64=WFUNC_FLATTOP},  0, 0, FLAGS, "win_func" },

  1106.         { "bharris",  "Blackman-Harris",  0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHARRIS},  0, 0, FLAGS, "win_func" },

  1107.         { "bnuttall", "Blackman-Nuttall", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BNUTTALL}, 0, 0, FLAGS, "win_func" },

  1108.         { "bhann",    "Bartlett-Hann",    0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHANN},    0, 0, FLAGS, "win_func" },

  1109.         { "sine",     "Sine",             0, AV_OPT_TYPE_CONST, {.i64=WFUNC_SINE},     0, 0, FLAGS, "win_func" },

  1110.         { "nuttall",  "Nuttall",          0, AV_OPT_TYPE_CONST, {.i64=WFUNC_NUTTALL},  0, 0, FLAGS, "win_func" },

  1111.         { "lanczos",  "Lanczos",          0, AV_OPT_TYPE_CONST, {.i64=WFUNC_LANCZOS},  0, 0, FLAGS, "win_func" },

  1112.         { "gauss",    "Gauss",            0, AV_OPT_TYPE_CONST, {.i64=WFUNC_GAUSS},    0, 0, FLAGS, "win_func" },

  1113.         { "tukey",    "Tukey",            0, AV_OPT_TYPE_CONST, {.i64=WFUNC_TUKEY},    0, 0, FLAGS, "win_func" },

  1114.         { "dolph",    "Dolph-Chebyshev",  0, AV_OPT_TYPE_CONST, {.i64=WFUNC_DOLPH},    0, 0, FLAGS, "win_func" },

  1115.         { "cauchy",   "Cauchy",           0, AV_OPT_TYPE_CONST, {.i64=WFUNC_CAUCHY},   0, 0, FLAGS, "win_func" },

  1116.         { "parzen",   "Parzen",           0, AV_OPT_TYPE_CONST, {.i64=WFUNC_PARZEN},   0, 0, FLAGS, "win_func" },

  1117.         { "poisson",  "Poisson",          0, AV_OPT_TYPE_CONST, {.i64=WFUNC_POISSON},  0, 0, FLAGS, "win_func" },

  1118.     { "orientation", "set orientation", OFFSET(orientation), AV_OPT_TYPE_INT, {.i64=VERTICAL}, 0, NB_ORIENTATIONS-1, FLAGS, "orientation" },

  1119.         { "vertical",   NULL, 0, AV_OPT_TYPE_CONST, {.i64=VERTICAL},   0, 0, FLAGS, "orientation" },

  1120.         { "horizontal", NULL, 0, AV_OPT_TYPE_CONST, {.i64=HORIZONTAL}, 0, 0, FLAGS, "orientation" },

  1121.     { "gain", "set scale gain", OFFSET(gain), AV_OPT_TYPE_FLOAT, {.dbl = 1}, 0, 128, FLAGS },

  1122.     { "legend", "draw legend", OFFSET(legend), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, FLAGS },

  1123.     { "rotation", "color rotation", OFFSET(rotation), AV_OPT_TYPE_FLOAT, {.dbl = 0}, -1, 1, FLAGS },

  1124.     { NULL }

  1125. };

  1126. 

  1127. AVFILTER_DEFINE_CLASS(showspectrumpic);

  1128. 

  1129. static void drawtext(AVFrame *pic, int x, int y, const char *txt, int o)

  1130. {

  1131.     const uint8_t *font;

  1132.     int font_height;

  1133.     int i;

  1134. 

  1135.     font = avpriv_cga_font,   font_height =  8;

  1136. 

  1137.     for (i = 0; txt[i]; i++) {

  1138.         int char_y, mask;

  1139. 

  1140.         if (o) {

  1141.             for (char_y = font_height - 1; char_y >= 0; char_y--) {

  1142.                 uint8_t *p = pic->data[0] + (y + i * 10) * pic->linesize[0] + x;

  1143.                 for (mask = 0x80; mask; mask >>= 1) {

  1144.                     if (font[txt[i] * font_height + font_height - 1 - char_y] & mask)

  1145.                         p[char_y] = ~p[char_y];

  1146.                     p += pic->linesize[0];

  1147.                 }

  1148.             }

  1149.         } else {

  1150.             uint8_t *p = pic->data[0] + y*pic->linesize[0] + (x + i*8);

  1151.             for (char_y = 0; char_y < font_height; char_y++) {

  1152.                 for (mask = 0x80; mask; mask >>= 1) {

  1153.                     if (font[txt[i] * font_height + char_y] & mask)

  1154.                         *p = ~(*p);

  1155.                     p++;

  1156.                 }

  1157.                 p += pic->linesize[0] - 8;

  1158.             }

  1159.         }

  1160.     }

  1161. }

  1162. 

  1163. static int showspectrumpic_request_frame(AVFilterLink *outlink)

  1164. {

  1165.     AVFilterContext *ctx = outlink->src;

  1166.     ShowSpectrumContext *s = ctx->priv;

  1167.     AVFilterLink *inlink = ctx->inputs[0];

  1168.     int ret, samples;

  1169. 

  1170.     ret = ff_request_frame(inlink);

  1171.     samples = av_audio_fifo_size(s->fifo);

  1172.     if (ret == AVERROR_EOF && s->outpicref && samples > 0) {

  1173.         int consumed = 0;

  1174.         int y, x = 0, sz = s->orientation == VERTICAL ? s->w : s->h;

  1175.         int ch, spf, spb;

  1176.         AVFrame *fin;

  1177. 

  1178.         spf = s->win_size * (samples / ((s->win_size * sz) * ceil(samples / (float)(s->win_size * sz))));

  1179.         spf = FFMAX(1, spf);

  1180. 

  1181.         spb = (samples / (spf * sz)) * spf;

  1182. 

  1183.         fin = ff_get_audio_buffer(inlink, s->win_size);

  1184.         if (!fin)

  1185.             return AVERROR(ENOMEM);

  1186. 

  1187.         while (x < sz) {

  1188.             ret = av_audio_fifo_peek(s->fifo, (void **)fin->extended_data, s->win_size);

  1189.             if (ret < 0) {

  1190.                 av_frame_free(&fin);

  1191.                 return ret;

  1192.             }

  1193. 

  1194.             av_audio_fifo_drain(s->fifo, spf);

  1195. 

  1196.             if (ret < s->win_size) {

  1197.                 for (ch = 0; ch < s->nb_display_channels; ch++) {

  1198.                     memset(fin->extended_data[ch] + ret * sizeof(float), 0,

  1199.                            (s->win_size - ret) * sizeof(float));

  1200.                 }

  1201.             }

  1202. 

  1203.             ctx->internal->execute(ctx, run_channel_fft, fin, NULL, s->nb_display_channels);

  1204.             acalc_magnitudes(s);

  1205. 

  1206.             consumed += spf;

  1207.             if (consumed >= spb) {

  1208.                 int h = s->orientation == VERTICAL ? s->h : s->w;

  1209. 

  1210.                 scale_magnitudes(s, 1. / (consumed / spf));

  1211.                 plot_spectrum_column(inlink, fin);

  1212.                 consumed = 0;

  1213.                 x++;

  1214.                 for (ch = 0; ch < s->nb_display_channels; ch++)

  1215.                     memset(s->magnitudes[ch], 0, h * sizeof(float));

  1216.             }

  1217.         }

  1218. 

  1219.         av_frame_free(&fin);

  1220.         s->outpicref->pts = 0;

  1221. 

  1222.         if (s->legend) {

  1223.             int multi = (s->mode == SEPARATE && s->color_mode == CHANNEL);

  1224.             float spp = samples / (float)sz;

  1225.             char *text;

  1226.             uint8_t *dst;

  1227.             char chlayout_str[128];

  1228. 

  1229.             av_get_channel_layout_string(chlayout_str, sizeof(chlayout_str), inlink->channels,

  1230.                                          inlink->channel_layout);

  1231. 

  1232.             text = av_asprintf("%d Hz | %s", inlink->sample_rate, chlayout_str);

  1233. 

  1234.             drawtext(s->outpicref, 2, outlink->h - 10, "CREATED BY LIBAVFILTER", 0);

  1235.             drawtext(s->outpicref, outlink->w - 2 - strlen(text) * 10, outlink->h - 10, text, 0);

  1236. 

  1237.             av_freep(&text);

  1238. 

  1239.             dst = s->outpicref->data[0] + (s->start_y - 1) * s->outpicref->linesize[0] + s->start_x - 1;

  1240.             for (x = 0; x < s->w + 1; x++)

  1241.                 dst[x] = 200;

  1242.             dst = s->outpicref->data[0] + (s->start_y + s->h) * s->outpicref->linesize[0] + s->start_x - 1;

  1243.             for (x = 0; x < s->w + 1; x++)

  1244.                 dst[x] = 200;

  1245.             for (y = 0; y < s->h + 2; y++) {

  1246.                 dst = s->outpicref->data[0] + (y + s->start_y - 1) * s->outpicref->linesize[0];

  1247.                 dst[s->start_x - 1] = 200;

  1248.                 dst[s->start_x + s->w] = 200;

  1249.             }

  1250.             if (s->orientation == VERTICAL) {

  1251.                 int h = s->mode == SEPARATE ? s->h / s->nb_display_channels : s->h;

  1252.                 int hh = s->mode == SEPARATE ? -(s->h % s->nb_display_channels) + 1 : 1;

  1253.                 for (ch = 0; ch < (s->mode == SEPARATE ? s->nb_display_channels : 1); ch++) {

  1254.                     for (y = 0; y < h; y += 20) {

  1255.                         dst = s->outpicref->data[0] + (s->start_y + h * (ch + 1) - y - hh) * s->outpicref->linesize[0];

  1256.                         dst[s->start_x - 2] = 200;

  1257.                         dst[s->start_x + s->w + 1] = 200;

  1258.                     }

  1259.                     for (y = 0; y < h; y += 40) {

  1260.                         dst = s->outpicref->data[0] + (s->start_y + h * (ch + 1) - y - hh) * s->outpicref->linesize[0];

  1261.                         dst[s->start_x - 3] = 200;

  1262.                         dst[s->start_x + s->w + 2] = 200;

  1263.                     }

  1264.                     dst = s->outpicref->data[0] + (s->start_y - 2) * s->outpicref->linesize[0] + s->start_x;

  1265.                     for (x = 0; x < s->w; x+=40)

  1266.                         dst[x] = 200;

  1267.                     dst = s->outpicref->data[0] + (s->start_y - 3) * s->outpicref->linesize[0] + s->start_x;

  1268.                     for (x = 0; x < s->w; x+=80)

  1269.                         dst[x] = 200;

  1270.                     dst = s->outpicref->data[0] + (s->h + s->start_y + 1) * s->outpicref->linesize[0] + s->start_x;

  1271.                     for (x = 0; x < s->w; x+=40) {

  1272.                         dst[x] = 200;

  1273.                     }

  1274.                     dst = s->outpicref->data[0] + (s->h + s->start_y + 2) * s->outpicref->linesize[0] + s->start_x;

  1275.                     for (x = 0; x < s->w; x+=80) {

  1276.                         dst[x] = 200;

  1277.                     }

  1278.                     for (y = 0; y < h; y += 40) {

  1279.                         float hertz = y * (inlink->sample_rate / 2) / (float)(1 << (int)ceil(log2(h)));

  1280.                         char *units;

  1281. 

  1282.                         if (hertz == 0)

  1283.                             units = av_asprintf("DC");

  1284.                         else

  1285.                             units = av_asprintf("%.2f", hertz);

  1286.                         if (!units)

  1287.                             return AVERROR(ENOMEM);

  1288. 

  1289.                         drawtext(s->outpicref, s->start_x - 8 * strlen(units) - 4, h * (ch + 1) + s->start_y - y - 4 - hh, units, 0);

  1290.                         av_free(units);

  1291.                     }

  1292.                 }

  1293. 

  1294.                 for (x = 0; x < s->w; x+=80) {

  1295.                     float seconds = x * spp / inlink->sample_rate;

  1296.                     char *units;

  1297. 

  1298.                     if (x == 0)

  1299.                         units = av_asprintf("0");

  1300.                     else if (log10(seconds) > 6)

  1301.                         units = av_asprintf("%.2fh", seconds / (60 * 60));

  1302.                     else if (log10(seconds) > 3)

  1303.                         units = av_asprintf("%.2fm", seconds / 60);

  1304.                     else

  1305.                         units = av_asprintf("%.2fs", seconds);

  1306.                     if (!units)

  1307.                         return AVERROR(ENOMEM);

  1308. 

  1309.                     drawtext(s->outpicref, s->start_x + x - 4 * strlen(units), s->h + s->start_y + 6, units, 0);

  1310.                     drawtext(s->outpicref, s->start_x + x - 4 * strlen(units), s->start_y - 12, units, 0);

  1311.                     av_free(units);

  1312.                 }

  1313. 

  1314.                 drawtext(s->outpicref, outlink->w / 2 - 4 * 4, outlink->h - s->start_y / 2, "TIME", 0);

  1315.                 drawtext(s->outpicref, s->start_x / 7, outlink->h / 2 - 14 * 4, "FREQUENCY (Hz)", 1);

  1316.             } else {

  1317.                 int w = s->mode == SEPARATE ? s->w / s->nb_display_channels : s->w;

  1318.                 for (y = 0; y < s->h; y += 20) {

  1319.                     dst = s->outpicref->data[0] + (s->start_y + y) * s->outpicref->linesize[0];

  1320.                     dst[s->start_x - 2] = 200;

  1321.                     dst[s->start_x + s->w + 1] = 200;

  1322.                 }

  1323.                 for (y = 0; y < s->h; y += 40) {

  1324.                     dst = s->outpicref->data[0] + (s->start_y + y) * s->outpicref->linesize[0];

  1325.                     dst[s->start_x - 3] = 200;

  1326.                     dst[s->start_x + s->w + 2] = 200;

  1327.                 }

  1328.                 for (ch = 0; ch < (s->mode == SEPARATE ? s->nb_display_channels : 1); ch++) {

  1329.                     dst = s->outpicref->data[0] + (s->start_y - 2) * s->outpicref->linesize[0] + s->start_x + w * ch;

  1330.                     for (x = 0; x < w; x+=40)

  1331.                         dst[x] = 200;

  1332.                     dst = s->outpicref->data[0] + (s->start_y - 3) * s->outpicref->linesize[0] + s->start_x + w * ch;

  1333.                     for (x = 0; x < w; x+=80)

  1334.                         dst[x] = 200;

  1335.                     dst = s->outpicref->data[0] + (s->h + s->start_y + 1) * s->outpicref->linesize[0] + s->start_x + w * ch;

  1336.                     for (x = 0; x < w; x+=40) {

  1337.                         dst[x] = 200;

  1338.                     }

  1339.                     dst = s->outpicref->data[0] + (s->h + s->start_y + 2) * s->outpicref->linesize[0] + s->start_x + w * ch;

  1340.                     for (x = 0; x < w; x+=80) {

  1341.                         dst[x] = 200;

  1342.                     }

  1343.                     for (x = 0; x < w - 79; x += 80) {

  1344.                         float hertz = x * (inlink->sample_rate / 2) / (float)(1 << (int)ceil(log2(w)));

  1345.                         char *units;

  1346. 

  1347.                         if (hertz == 0)

  1348.                             units = av_asprintf("DC");

  1349.                         else

  1350.                             units = av_asprintf("%.2f", hertz);

  1351.                         if (!units)

  1352.                             return AVERROR(ENOMEM);

  1353. 

  1354.                         drawtext(s->outpicref, s->start_x - 4 * strlen(units) + x + w * ch, s->start_y - 12, units, 0);

  1355.                         drawtext(s->outpicref, s->start_x - 4 * strlen(units) + x + w * ch, s->h + s->start_y + 6, units, 0);

  1356.                         av_free(units);

  1357.                     }

  1358.                 }

  1359.                 for (y = 0; y < s->h; y+=40) {

  1360.                     float seconds = y * spp / inlink->sample_rate;

  1361.                     char *units;

  1362. 

  1363.                     if (x == 0)

  1364.                         units = av_asprintf("0");

  1365.                     else if (log10(seconds) > 6)

  1366.                         units = av_asprintf("%.2fh", seconds / (60 * 60));

  1367.                     else if (log10(seconds) > 3)

  1368.                         units = av_asprintf("%.2fm", seconds / 60);

  1369.                     else

  1370.                         units = av_asprintf("%.2fs", seconds);

  1371.                     if (!units)

  1372.                         return AVERROR(ENOMEM);

  1373. 

  1374.                     drawtext(s->outpicref, s->start_x - 8 * strlen(units) - 4, s->start_y + y - 4, units, 0);

  1375.                     av_free(units);

  1376.                 }

  1377.                 drawtext(s->outpicref, s->start_x / 7, outlink->h / 2 - 4 * 4, "TIME", 1);

  1378.                 drawtext(s->outpicref, outlink->w / 2 - 14 * 4, outlink->h - s->start_y / 2, "FREQUENCY (Hz)", 0);

  1379.             }

  1380. 

  1381.             for (ch = 0; ch < (multi ? s->nb_display_channels : 1); ch++) {

  1382.                 int h = multi ? s->h / s->nb_display_channels : s->h;

  1383. 

  1384.                 for (y = 0; y < h; y++) {

  1385.                     float out[3] = { 0., 127.5, 127.5};

  1386.                     int chn;

  1387. 

  1388.                     for (chn = 0; chn < (s->mode == SEPARATE ? 1 : s->nb_display_channels); chn++) {

  1389.                         float yf, uf, vf;

  1390.                         int channel = (multi) ? s->nb_display_channels - ch - 1 : chn;

  1391.                         float lout[3];

  1392. 

  1393.                         color_range(s, channel, &yf, &uf, &vf);

  1394.                         pick_color(s, yf, uf, vf, y / (float)h, lout);

  1395.                         out[0] += lout[0];

  1396.                         out[1] += lout[1];

  1397.                         out[2] += lout[2];

  1398.                     }

  1399.                     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);

  1400.                     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);

  1401.                     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);

  1402.                 }

  1403. 

  1404.                 for (y = 0; ch == 0 && y < h; y += h / 10) {

  1405.                     float value = 120.0 * log10(1. - y / (float)h);

  1406.                     char *text;

  1407. 

  1408.                     if (value < -120)

  1409.                         break;

  1410.                     text = av_asprintf("%.0f dB", value);

  1411.                     if (!text)

  1412.                         continue;

  1413.                     drawtext(s->outpicref, s->w + s->start_x + 35, s->start_y + y - 5, text, 0);

  1414.                     av_free(text);

  1415.                 }

  1416.             }

  1417.         }

  1418. 

  1419.         ret = ff_filter_frame(outlink, s->outpicref);

  1420.         s->outpicref = NULL;

  1421.     }

  1422. 

  1423.     return ret;

  1424. }

  1425. 

  1426. static int showspectrumpic_filter_frame(AVFilterLink *inlink, AVFrame *insamples)

  1427. {

  1428.     AVFilterContext *ctx = inlink->dst;

  1429.     ShowSpectrumContext *s = ctx->priv;

  1430.     int ret;

  1431. 

  1432.     ret = av_audio_fifo_write(s->fifo, (void **)insamples->extended_data, insamples->nb_samples);

  1433.     av_frame_free(&insamples);

  1434.     return ret;

  1435. }

  1436. 

  1437. static const AVFilterPad showspectrumpic_inputs[] = {

  1438.     {

  1439.         .name         = "default",

  1440.         .type         = AVMEDIA_TYPE_AUDIO,

  1441.         .filter_frame = showspectrumpic_filter_frame,

  1442.     },

  1443.     { NULL }

  1444. };

  1445. 

  1446. static const AVFilterPad showspectrumpic_outputs[] = {

  1447.     {

  1448.         .name          = "default",

  1449.         .type          = AVMEDIA_TYPE_VIDEO,

  1450.         .config_props  = config_output,

  1451.         .request_frame = showspectrumpic_request_frame,

  1452.     },

  1453.     { NULL }

  1454. };

  1455. 

  1456. AVFilter ff_avf_showspectrumpic = {

  1457.     .name          = "showspectrumpic",

  1458.     .description   = NULL_IF_CONFIG_SMALL("Convert input audio to a spectrum video output single picture."),

  1459.     .uninit        = uninit,

  1460.     .query_formats = query_formats,

  1461.     .priv_size     = sizeof(ShowSpectrumContext),

  1462.     .inputs        = showspectrumpic_inputs,

  1463.     .outputs       = showspectrumpic_outputs,

  1464.     .priv_class    = &showspectrumpic_class,

  1465.     .flags         = AVFILTER_FLAG_SLICE_THREADS,

  1466. };

  1467. 

  1468. #endif // CONFIG_SHOWSPECTRUMPIC_FILTER