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

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

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

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

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

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

  123.         { "4thrt","4th root",    0, AV_OPT_TYPE_CONST, {.i64=FOURTHRT}, 0, 0, FLAGS, "scale" },

  124.         { "5thrt","5th root",    0, AV_OPT_TYPE_CONST, {.i64=FIFTHRT},  0, 0, FLAGS, "scale" },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  158.     { NULL }

  159. };

  160. 

  161. AVFILTER_DEFINE_CLASS(showspectrum);

  162. 

  163. static const struct ColorTable {

  164.     float a, y, u, v;

  165. } color_table[][8] = {

  166.     [INTENSITY] = {

  167.     {    0,                  0,                  0,                   0 },

  168.     { 0.13, .03587126228984074,  .1573300977624594, -.02548747583751842 },

  169.     { 0.30, .18572281794568020,  .1772436246393981,  .17475554840414750 },

  170.     { 0.60, .28184980583656130, -.1593064119945782,  .47132074554608920 },

  171.     { 0.73, .65830621175547810, -.3716070802232764,  .24352759331252930 },

  172.     { 0.78, .76318535758242900, -.4307467689263783,  .16866496622310430 },

  173.     { 0.91, .95336363636363640, -.2045454545454546,  .03313636363636363 },

  174.     {    1,                  1,                  0,                   0 }},

  175.     [RAINBOW] = {

  176.     {    0,                  0,                  0,                   0 },

  177.     { 0.13,            44/256.,     (189-128)/256.,      (138-128)/256. },

  178.     { 0.25,            29/256.,     (186-128)/256.,      (119-128)/256. },

  179.     { 0.38,           119/256.,     (194-128)/256.,       (53-128)/256. },

  180.     { 0.60,           111/256.,      (73-128)/256.,       (59-128)/256. },

  181.     { 0.73,           205/256.,      (19-128)/256.,      (149-128)/256. },

  182.     { 0.86,           135/256.,      (83-128)/256.,      (200-128)/256. },

  183.     {    1,            73/256.,      (95-128)/256.,      (225-128)/256. }},

  184.     [MORELAND] = {

  185.     {    0,            44/256.,     (181-128)/256.,      (112-128)/256. },

  186.     { 0.13,           126/256.,     (177-128)/256.,      (106-128)/256. },

  187.     { 0.25,           164/256.,     (163-128)/256.,      (109-128)/256. },

  188.     { 0.38,           200/256.,     (140-128)/256.,      (120-128)/256. },

  189.     { 0.60,           201/256.,     (117-128)/256.,      (141-128)/256. },

  190.     { 0.73,           177/256.,     (103-128)/256.,      (165-128)/256. },

  191.     { 0.86,           136/256.,     (100-128)/256.,      (183-128)/256. },

  192.     {    1,            68/256.,     (117-128)/256.,      (203-128)/256. }},

  193.     [NEBULAE] = {

  194.     {    0,            10/256.,     (134-128)/256.,      (132-128)/256. },

  195.     { 0.23,            21/256.,     (137-128)/256.,      (130-128)/256. },

  196.     { 0.45,            35/256.,     (134-128)/256.,      (134-128)/256. },

  197.     { 0.57,            51/256.,     (130-128)/256.,      (139-128)/256. },

  198.     { 0.67,           104/256.,     (116-128)/256.,      (162-128)/256. },

  199.     { 0.77,           120/256.,     (105-128)/256.,      (188-128)/256. },

  200.     { 0.87,           140/256.,     (105-128)/256.,      (188-128)/256. },

  201.     {    1,                  1,                  0,                   0 }},

  202.     [FIRE] = {

  203.     {    0,                  0,                  0,                   0 },

  204.     { 0.23,            44/256.,     (132-128)/256.,      (127-128)/256. },

  205.     { 0.45,            62/256.,     (116-128)/256.,      (140-128)/256. },

  206.     { 0.57,            75/256.,     (105-128)/256.,      (152-128)/256. },

  207.     { 0.67,            95/256.,      (91-128)/256.,      (166-128)/256. },

  208.     { 0.77,           126/256.,      (74-128)/256.,      (172-128)/256. },

  209.     { 0.87,           164/256.,      (73-128)/256.,      (162-128)/256. },

  210.     {    1,                  1,                  0,                   0 }},

  211.     [FIERY] = {

  212.     {    0,                  0,                  0,                   0 },

  213.     { 0.23,            36/256.,     (116-128)/256.,      (163-128)/256. },

  214.     { 0.45,            52/256.,     (102-128)/256.,      (200-128)/256. },

  215.     { 0.57,           116/256.,      (84-128)/256.,      (196-128)/256. },

  216.     { 0.67,           157/256.,      (67-128)/256.,      (181-128)/256. },

  217.     { 0.77,           193/256.,      (40-128)/256.,      (155-128)/256. },

  218.     { 0.87,           221/256.,     (101-128)/256.,      (134-128)/256. },

  219.     {    1,                  1,                  0,                   0 }},

  220.     [FRUIT] = {

  221.     {    0,                  0,                  0,                   0 },

  222.     { 0.20,            29/256.,     (136-128)/256.,      (119-128)/256. },

  223.     { 0.30,            60/256.,     (119-128)/256.,       (90-128)/256. },

  224.     { 0.40,            85/256.,      (91-128)/256.,       (85-128)/256. },

  225.     { 0.50,           116/256.,      (70-128)/256.,      (105-128)/256. },

  226.     { 0.60,           151/256.,      (50-128)/256.,      (146-128)/256. },

  227.     { 0.70,           191/256.,      (63-128)/256.,      (178-128)/256. },

  228.     {    1,            98/256.,      (80-128)/256.,      (221-128)/256. }},

  229.     [COOL] = {

  230.     {    0,                  0,                  0,                   0 },

  231.     {  .15,                  0,                 .5,                 -.5 },

  232.     {    1,                  1,                -.5,                  .5 }},

  233.     [MAGMA] = {

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

  235.     { 0.10,            23/256.,     (175-128)/256.,      (120-128)/256. },

  236.     { 0.23,            43/256.,     (158-128)/256.,      (144-128)/256. },

  237.     { 0.35,            85/256.,     (138-128)/256.,      (179-128)/256. },

  238.     { 0.48,            96/256.,     (128-128)/256.,      (189-128)/256. },

  239.     { 0.64,           128/256.,     (103-128)/256.,      (214-128)/256. },

  240.     { 0.78,           167/256.,      (85-128)/256.,      (174-128)/256. },

  241.     {    1,           205/256.,      (80-128)/256.,      (152-128)/256. }},

  242.     [GREEN] = {

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

  244.     {  .75,                 .5,                  0,                 -.5 },

  245.     {    1,                  1,                  0,                   0 }},

  246. };

  247. 

  248. static av_cold void uninit(AVFilterContext *ctx)

  249. {

  250.     ShowSpectrumContext *s = ctx->priv;

  251.     int i;

  252. 

  253.     av_freep(&s->combine_buffer);

  254.     if (s->fft) {

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

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

  257.     }

  258.     av_freep(&s->fft);

  259.     if (s->ifft) {

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

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

  262.     }

  263.     av_freep(&s->ifft);

  264.     if (s->fft_data) {

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

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

  267.     }

  268.     av_freep(&s->fft_data);

  269.     if (s->fft_scratch) {

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

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

  272.     }

  273.     av_freep(&s->fft_scratch);

  274.     if (s->color_buffer) {

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

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

  277.     }

  278.     av_freep(&s->color_buffer);

  279.     av_freep(&s->window_func_lut);

  280.     if (s->magnitudes) {

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

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

  283.     }

  284.     av_freep(&s->magnitudes);

  285.     av_frame_free(&s->outpicref);

  286.     av_audio_fifo_free(s->fifo);

  287.     if (s->phases) {

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

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

  290.     }

  291.     av_freep(&s->phases);

  292. }

  293. 

  294. static int query_formats(AVFilterContext *ctx)

  295. {

  296.     AVFilterFormats *formats = NULL;

  297.     AVFilterChannelLayouts *layouts = NULL;

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

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

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

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

  302.     int ret;

  303. 

  304.     /* set input audio formats */

  305.     formats = ff_make_format_list(sample_fmts);

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

  307.         return ret;

  308. 

  309.     layouts = ff_all_channel_layouts();

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

  311.         return ret;

  312. 

  313.     formats = ff_all_samplerates();

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

  315.         return ret;

  316. 

  317.     /* set output video format */

  318.     formats = ff_make_format_list(pix_fmts);

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

  320.         return ret;

  321. 

  322.     return 0;

  323. }

  324. 

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

  326. {

  327.     ShowSpectrumContext *s = ctx->priv;

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

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

  330.     AVFrame *fin = arg;

  331.     const int ch = jobnr;

  332.     int n;

  333. 

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

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

  336. 

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

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

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

  340.     }

  341. 

  342.     if (s->stop) {

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

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

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

  346.         int L = s->buf_size;

  347.         int N = s->win_size;

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

  349. 

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

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

  352. 

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

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

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

  356.         }

  357. 

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

  359.             h[n].re = 0.0;

  360.             h[n].im = 0.0;

  361.         }

  362. 

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

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

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

  366.         }

  367. 

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

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

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

  371.         }

  372. 

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

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

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

  376.         }

  377. 

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

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

  380.             c =  cos(psi);

  381.             S = -sin(psi);

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

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

  384.             g[n].re = a;

  385.             g[n].im = b;

  386.         }

  387. 

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

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

  390. 

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

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

  393. 

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

  395.             c = g[n].re;

  396.             S = g[n].im;

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

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

  399. 

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

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

  402.         }

  403. 

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

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

  406. 

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

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

  409.             c =  cos(psi);

  410.             S = -sin(psi);

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

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

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

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

  415.         }

  416.     } else {

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

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

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

  420.     }

  421. 

  422.     return 0;

  423. }

  424. 

  425. static int config_output(AVFilterLink *outlink)

  426. {

  427.     AVFilterContext *ctx = outlink->src;

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

  429.     ShowSpectrumContext *s = ctx->priv;

  430.     int i, fft_bits, h, w;

  431.     float overlap;

  432. 

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

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

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

  436.         return AVERROR(EINVAL);

  437.     }

  438. 

  439.     s->pts = AV_NOPTS_VALUE;

  440. 

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

  442.         s->single_pic = 1;

  443. 

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

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

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

  447. 

  448.     if (s->legend) {

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

  450.         s->start_y = 64;

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

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

  453.     }

  454. 

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

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

  457.     s->channel_height = h;

  458.     s->channel_width  = w;

  459. 

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

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

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

  463.     } else {

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

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

  466.     }

  467. 

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

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

  470. 

  471.     if (!s->fft) {

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

  473.         if (!s->fft)

  474.             return AVERROR(ENOMEM);

  475.     }

  476. 

  477.     if (s->stop) {

  478.         if (!s->ifft) {

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

  480.             if (!s->ifft)

  481.                 return AVERROR(ENOMEM);

  482.         }

  483.     }

  484. 

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

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

  487.         AVFrame *outpicref;

  488. 

  489.         s->fft_bits = fft_bits;

  490. 

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

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

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

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

  495.             if (s->stop) {

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

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

  498.             }

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

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

  501.         }

  502.         av_freep(&s->fft_data);

  503. 

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

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

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

  507.             if (s->stop) {

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

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

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

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

  512.                     return AVERROR(EINVAL);

  513.                 }

  514.             }

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

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

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

  518.                 return AVERROR(EINVAL);

  519.             }

  520.         }

  521. 

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

  523.         if (!s->magnitudes)

  524.             return AVERROR(ENOMEM);

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

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

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

  528.                 return AVERROR(ENOMEM);

  529.         }

  530. 

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

  532.         if (!s->phases)

  533.             return AVERROR(ENOMEM);

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

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

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

  537.                 return AVERROR(ENOMEM);

  538.         }

  539. 

  540.         av_freep(&s->color_buffer);

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

  542.         if (!s->color_buffer)

  543.             return AVERROR(ENOMEM);

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

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

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

  547.                 return AVERROR(ENOMEM);

  548.         }

  549. 

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

  551.         if (!s->fft_data)

  552.             return AVERROR(ENOMEM);

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

  554.         if (!s->fft_scratch)

  555.             return AVERROR(ENOMEM);

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

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

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

  559.                 return AVERROR(ENOMEM);

  560. 

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

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

  563.                 return AVERROR(ENOMEM);

  564.         }

  565. 

  566.         /* pre-calc windowing function */

  567.         s->window_func_lut =

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

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

  570.         if (!s->window_func_lut)

  571.             return AVERROR(ENOMEM);

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

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

  574.             s->overlap = overlap;

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

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

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

  578.             return AVERROR(EINVAL);

  579.         }

  580. 

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

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

  583.         }

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

  585. 

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

  587.         av_frame_free(&s->outpicref);

  588.         s->outpicref = outpicref =

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

  590.         if (!outpicref)

  591.             return AVERROR(ENOMEM);

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

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

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

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

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

  597.         }

  598.         outpicref->color_range = AVCOL_RANGE_JPEG;

  599.     }

  600. 

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

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

  603.         s->xpos = 0;

  604. 

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

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

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

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

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

  610. 

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

  612.         s->combine_buffer =

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

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

  615.     } else {

  616.         s->combine_buffer =

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

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

  619.     }

  620. 

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

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

  623. 

  624.     av_audio_fifo_free(s->fifo);

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

  626.     if (!s->fifo)

  627.         return AVERROR(ENOMEM);

  628.     return 0;

  629. }

  630. 

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

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

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

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

  635. 

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

  637. {

  638.     ShowSpectrumContext *s = ctx->priv;

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

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

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

  642.     const int ch = jobnr;

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

  644. 

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

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

  647. 

  648.     return 0;

  649. }

  650. 

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

  652. {

  653.     ShowSpectrumContext *s = ctx->priv;

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

  655.     const int ch = jobnr;

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

  657.     int y;

  658. 

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

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

  661. 

  662.     return 0;

  663. }

  664. 

  665. static void acalc_magnitudes(ShowSpectrumContext *s)

  666. {

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

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

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

  670. 

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

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

  673. 

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

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

  676.     }

  677. }

  678. 

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

  680. {

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

  682. 

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

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

  685. 

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

  687.             magnitudes[y] *= scale;

  688.     }

  689. }

  690. 

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

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

  693. {

  694.     switch (s->mode) {

  695.     case COMBINED:

  696.         // reduce range by channel count

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

  698.         switch (s->color_mode) {

  699.         case RAINBOW:

  700.         case MORELAND:

  701.         case NEBULAE:

  702.         case FIRE:

  703.         case FIERY:

  704.         case FRUIT:

  705.         case COOL:

  706.         case GREEN:

  707.         case MAGMA:

  708.         case INTENSITY:

  709.             *uf = *yf;

  710.             *vf = *yf;

  711.             break;

  712.         case CHANNEL:

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

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

  715.             *uf = *yf * M_PI;

  716.             *vf = *yf * M_PI;

  717.             break;

  718.         default:

  719.             av_assert0(0);

  720.         }

  721.         break;

  722.     case SEPARATE:

  723.         // full range

  724.         *yf = 256.0f;

  725.         *uf = 256.0f;

  726.         *vf = 256.0f;

  727.         break;

  728.     default:

  729.         av_assert0(0);

  730.     }

  731. 

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

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

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

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

  736.         } else {

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

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

  739.         }

  740.     } else {

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

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

  743.     }

  744. 

  745.     *uf *= s->saturation;

  746.     *vf *= s->saturation;

  747. }

  748. 

  749. static void pick_color(ShowSpectrumContext *s,

  750.                        float yf, float uf, float vf,

  751.                        float a, float *out)

  752. {

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

  754.         const int cm = s->color_mode;

  755.         float y, u, v;

  756.         int i;

  757. 

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

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

  760.                 break;

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

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

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

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

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

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

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

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

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

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

  771.         } else {

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

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

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

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

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

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

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

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

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

  781.         }

  782. 

  783.         out[0] = y * yf;

  784.         out[1] = u * uf;

  785.         out[2] = v * vf;

  786.     } else {

  787.         out[0] = a * yf;

  788.         out[1] = a * uf;

  789.         out[2] = a * vf;

  790.     }

  791. }

  792. 

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

  794. {

  795.     int y;

  796. 

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

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

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

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

  801.     }

  802. }

  803. 

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

  805. {

  806.     ShowSpectrumContext *s = ctx->priv;

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

  808.     const int ch = jobnr;

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

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

  811.     float yf, uf, vf;

  812.     int y;

  813. 

  814.     /* decide color range */

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

  816. 

  817.     /* draw the channel */

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

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

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

  821.         float a;

  822. 

  823.         switch (s->data) {

  824.         case D_MAGNITUDE:

  825.             /* get magnitude */

  826.             a = magnitudes[y];

  827.             break;

  828.         case D_PHASE:

  829.             /* get phase */

  830.             a = phases[y];

  831.             break;

  832.         default:

  833.             av_assert0(0);

  834.         }

  835. 

  836.         /* apply scale */

  837.         switch (s->scale) {

  838.         case LINEAR:

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

  840.             break;

  841.         case SQRT:

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

  843.             break;

  844.         case CBRT:

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

  846.             break;

  847.         case FOURTHRT:

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

  849.             break;

  850.         case FIFTHRT:

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

  852.             break;

  853.         case LOG:

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

  855.             break;

  856.         default:

  857.             av_assert0(0);

  858.         }

  859. 

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

  861.     }

  862. 

  863.     return 0;

  864. }

  865. 

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

  867. {

  868.     AVFilterContext *ctx = inlink->dst;

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

  870.     ShowSpectrumContext *s = ctx->priv;

  871.     AVFrame *outpicref = s->outpicref;

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

  873. 

  874.     /* fill a new spectrum column */

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

  876.     clear_combine_buffer(s, z);

  877. 

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

  879. 

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

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

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

  883.         }

  884.     }

  885. 

  886.     av_frame_make_writable(s->outpicref);

  887.     /* copy to output */

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

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

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

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

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

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

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

  895.                 }

  896.             }

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

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

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

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

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

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

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

  904.                 }

  905.             }

  906.             s->xpos = 0;

  907.         }

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

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

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

  911.                          s->xpos;

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

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

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

  915.             }

  916.         }

  917.     } else {

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

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

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

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

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

  923.                             s->w);

  924.                 }

  925.             }

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

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

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

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

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

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

  932.                             s->w);

  933.                 }

  934.             }

  935.             s->xpos = 0;

  936.         }

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

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

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

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

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

  942.                 p++;

  943.             }

  944.         }

  945.     }

  946. 

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

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

  949. 

  950.     s->xpos++;

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

  952.         s->xpos = 0;

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

  954.         s->xpos = 0;

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

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

  957.         if (ret < 0)

  958.             return ret;

  959.     }

  960. 

  961.     return s->win_size;

  962. }

  963. 

  964. #if CONFIG_SHOWSPECTRUM_FILTER

  965. 

  966. static int request_frame(AVFilterLink *outlink)

  967. {

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

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

  970.     unsigned i;

  971.     int ret;

  972. 

  973.     ret = ff_request_frame(inlink);

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

  975.         s->outpicref) {

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

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

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

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

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

  981.             }

  982.         } else {

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

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

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

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

  987.             }

  988.         }

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

  990.         s->outpicref = NULL;

  991.     }

  992. 

  993.     return ret;

  994. }

  995. 

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

  997. {

  998.     AVFilterContext *ctx = inlink->dst;

  999.     ShowSpectrumContext *s = ctx->priv;

  1000.     AVFrame *fin = NULL;

  1001.     int ret = 0, consumed = 0;

  1002. 

  1003.     if (s->pts == AV_NOPTS_VALUE)

  1004.         s->pts = insamples->pts - av_audio_fifo_size(s->fifo);

  1005. 

  1006.     av_audio_fifo_write(s->fifo, (void **)insamples->extended_data, insamples->nb_samples);

  1007.     av_frame_free(&insamples);

  1008.     while (av_audio_fifo_size(s->fifo) >= s->win_size) {

  1009.         fin = ff_get_audio_buffer(inlink, s->win_size);

  1010.         if (!fin) {

  1011.             ret = AVERROR(ENOMEM);

  1012.             goto fail;

  1013.         }

  1014. 

  1015.         fin->pts = s->pts + consumed;

  1016.         consumed += s->hop_size;

  1017.         ret = av_audio_fifo_peek(s->fifo, (void **)fin->extended_data, s->win_size);

  1018.         if (ret < 0)

  1019.             goto fail;

  1020. 

  1021.         av_assert0(fin->nb_samples == s->win_size);

  1022. 

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

  1024. 

  1025.         if (s->data == D_MAGNITUDE)

  1026.             ctx->internal->execute(ctx, calc_channel_magnitudes, NULL, NULL, s->nb_display_channels);

  1027. 

  1028.         if (s->data == D_PHASE)

  1029.             ctx->internal->execute(ctx, calc_channel_phases, NULL, NULL, s->nb_display_channels);

  1030. 

  1031.         ret = plot_spectrum_column(inlink, fin);

  1032.         av_frame_free(&fin);

  1033.         av_audio_fifo_drain(s->fifo, s->hop_size);

  1034.         if (ret < 0)

  1035.             goto fail;

  1036.     }

  1037. 

  1038. fail:

  1039.     s->pts = AV_NOPTS_VALUE;

  1040.     av_frame_free(&fin);

  1041.     return ret;

  1042. }

  1043. 

  1044. static const AVFilterPad showspectrum_inputs[] = {

  1045.     {

  1046.         .name         = "default",

  1047.         .type         = AVMEDIA_TYPE_AUDIO,

  1048.         .filter_frame = filter_frame,

  1049.     },

  1050.     { NULL }

  1051. };

  1052. 

  1053. static const AVFilterPad showspectrum_outputs[] = {

  1054.     {

  1055.         .name          = "default",

  1056.         .type          = AVMEDIA_TYPE_VIDEO,

  1057.         .config_props  = config_output,

  1058.         .request_frame = request_frame,

  1059.     },

  1060.     { NULL }

  1061. };

  1062. 

  1063. AVFilter ff_avf_showspectrum = {

  1064.     .name          = "showspectrum",

  1065.     .description   = NULL_IF_CONFIG_SMALL("Convert input audio to a spectrum video output."),

  1066.     .uninit        = uninit,

  1067.     .query_formats = query_formats,

  1068.     .priv_size     = sizeof(ShowSpectrumContext),

  1069.     .inputs        = showspectrum_inputs,

  1070.     .outputs       = showspectrum_outputs,

  1071.     .priv_class    = &showspectrum_class,

  1072.     .flags         = AVFILTER_FLAG_SLICE_THREADS,

  1073. };

  1074. #endif // CONFIG_SHOWSPECTRUM_FILTER

  1075. 

  1076. #if CONFIG_SHOWSPECTRUMPIC_FILTER

  1077. 

  1078. static const AVOption showspectrumpic_options[] = {

  1079.     { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "4096x2048"}, 0, 0, FLAGS },

  1080.     { "s",    "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "4096x2048"}, 0, 0, FLAGS },

  1081.     { "mode", "set channel display mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=COMBINED}, 0, NB_MODES-1, FLAGS, "mode" },

  1082.         { "combined", "combined mode", 0, AV_OPT_TYPE_CONST, {.i64=COMBINED}, 0, 0, FLAGS, "mode" },

  1083.         { "separate", "separate mode", 0, AV_OPT_TYPE_CONST, {.i64=SEPARATE}, 0, 0, FLAGS, "mode" },

  1084.     { "color", "set channel coloring", OFFSET(color_mode), AV_OPT_TYPE_INT, {.i64=INTENSITY}, 0, NB_CLMODES-1, FLAGS, "color" },

  1085.         { "channel",   "separate color for each channel", 0, AV_OPT_TYPE_CONST, {.i64=CHANNEL},   0, 0, FLAGS, "color" },

  1086.         { "intensity", "intensity based coloring",        0, AV_OPT_TYPE_CONST, {.i64=INTENSITY}, 0, 0, FLAGS, "color" },

  1087.         { "rainbow",   "rainbow based coloring",          0, AV_OPT_TYPE_CONST, {.i64=RAINBOW},   0, 0, FLAGS, "color" },

  1088.         { "moreland",  "moreland based coloring",         0, AV_OPT_TYPE_CONST, {.i64=MORELAND},  0, 0, FLAGS, "color" },

  1089.         { "nebulae",   "nebulae based coloring",          0, AV_OPT_TYPE_CONST, {.i64=NEBULAE},   0, 0, FLAGS, "color" },

  1090.         { "fire",      "fire based coloring",             0, AV_OPT_TYPE_CONST, {.i64=FIRE},      0, 0, FLAGS, "color" },

  1091.         { "fiery",     "fiery based coloring",            0, AV_OPT_TYPE_CONST, {.i64=FIERY},     0, 0, FLAGS, "color" },

  1092.         { "fruit",     "fruit based coloring",            0, AV_OPT_TYPE_CONST, {.i64=FRUIT},     0, 0, FLAGS, "color" },

  1093.         { "cool",      "cool based coloring",             0, AV_OPT_TYPE_CONST, {.i64=COOL},      0, 0, FLAGS, "color" },

  1094.         { "magma",     "magma based coloring",            0, AV_OPT_TYPE_CONST, {.i64=MAGMA},     0, 0, FLAGS, "color" },

  1095.         { "green",     "green based coloring",            0, AV_OPT_TYPE_CONST, {.i64=GREEN},     0, 0, FLAGS, "color" },

  1096.     { "scale", "set display scale", OFFSET(scale), AV_OPT_TYPE_INT, {.i64=LOG}, 0, NB_SCALES-1, FLAGS, "scale" },

  1097.         { "lin",  "linear",      0, AV_OPT_TYPE_CONST, {.i64=LINEAR}, 0, 0, FLAGS, "scale" },

  1098.         { "sqrt", "square root", 0, AV_OPT_TYPE_CONST, {.i64=SQRT},   0, 0, FLAGS, "scale" },

  1099.         { "cbrt", "cubic root",  0, AV_OPT_TYPE_CONST, {.i64=CBRT},   0, 0, FLAGS, "scale" },

  1100.         { "log",  "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=LOG},    0, 0, FLAGS, "scale" },

  1101.         { "4thrt","4th root",    0, AV_OPT_TYPE_CONST, {.i64=FOURTHRT}, 0, 0, FLAGS, "scale" },

  1102.         { "5thrt","5th root",    0, AV_OPT_TYPE_CONST, {.i64=FIFTHRT},  0, 0, FLAGS, "scale" },

  1103.     { "saturation", "color saturation multiplier", OFFSET(saturation), AV_OPT_TYPE_FLOAT, {.dbl = 1}, -10, 10, FLAGS },

  1104.     { "win_func", "set window function", OFFSET(win_func), AV_OPT_TYPE_INT, {.i64 = WFUNC_HANNING}, 0, NB_WFUNC-1, FLAGS, "win_func" },

  1105.         { "rect",     "Rectangular",      0, AV_OPT_TYPE_CONST, {.i64=WFUNC_RECT},     0, 0, FLAGS, "win_func" },

  1106.         { "bartlett", "Bartlett",         0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BARTLETT}, 0, 0, FLAGS, "win_func" },

  1107.         { "hann",     "Hann",             0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HANNING},  0, 0, FLAGS, "win_func" },

  1108.         { "hanning",  "Hanning",          0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HANNING},  0, 0, FLAGS, "win_func" },

  1109.         { "hamming",  "Hamming",          0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HAMMING},  0, 0, FLAGS, "win_func" },

  1110.         { "blackman", "Blackman",         0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BLACKMAN}, 0, 0, FLAGS, "win_func" },

  1111.         { "welch",    "Welch",            0, AV_OPT_TYPE_CONST, {.i64=WFUNC_WELCH},    0, 0, FLAGS, "win_func" },

  1112.         { "flattop",  "Flat-top",         0, AV_OPT_TYPE_CONST, {.i64=WFUNC_FLATTOP},  0, 0, FLAGS, "win_func" },

  1113.         { "bharris",  "Blackman-Harris",  0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHARRIS},  0, 0, FLAGS, "win_func" },

  1114.         { "bnuttall", "Blackman-Nuttall", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BNUTTALL}, 0, 0, FLAGS, "win_func" },

  1115.         { "bhann",    "Bartlett-Hann",    0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHANN},    0, 0, FLAGS, "win_func" },

  1116.         { "sine",     "Sine",             0, AV_OPT_TYPE_CONST, {.i64=WFUNC_SINE},     0, 0, FLAGS, "win_func" },

  1117.         { "nuttall",  "Nuttall",          0, AV_OPT_TYPE_CONST, {.i64=WFUNC_NUTTALL},  0, 0, FLAGS, "win_func" },

  1118.         { "lanczos",  "Lanczos",          0, AV_OPT_TYPE_CONST, {.i64=WFUNC_LANCZOS},  0, 0, FLAGS, "win_func" },

  1119.         { "gauss",    "Gauss",            0, AV_OPT_TYPE_CONST, {.i64=WFUNC_GAUSS},    0, 0, FLAGS, "win_func" },

  1120.         { "tukey",    "Tukey",            0, AV_OPT_TYPE_CONST, {.i64=WFUNC_TUKEY},    0, 0, FLAGS, "win_func" },

  1121.         { "dolph",    "Dolph-Chebyshev",  0, AV_OPT_TYPE_CONST, {.i64=WFUNC_DOLPH},    0, 0, FLAGS, "win_func" },

  1122.         { "cauchy",   "Cauchy",           0, AV_OPT_TYPE_CONST, {.i64=WFUNC_CAUCHY},   0, 0, FLAGS, "win_func" },

  1123.         { "parzen",   "Parzen",           0, AV_OPT_TYPE_CONST, {.i64=WFUNC_PARZEN},   0, 0, FLAGS, "win_func" },

  1124.         { "poisson",  "Poisson",          0, AV_OPT_TYPE_CONST, {.i64=WFUNC_POISSON},  0, 0, FLAGS, "win_func" },

  1125.     { "orientation", "set orientation", OFFSET(orientation), AV_OPT_TYPE_INT, {.i64=VERTICAL}, 0, NB_ORIENTATIONS-1, FLAGS, "orientation" },

  1126.         { "vertical",   NULL, 0, AV_OPT_TYPE_CONST, {.i64=VERTICAL},   0, 0, FLAGS, "orientation" },

  1127.         { "horizontal", NULL, 0, AV_OPT_TYPE_CONST, {.i64=HORIZONTAL}, 0, 0, FLAGS, "orientation" },

  1128.     { "gain", "set scale gain", OFFSET(gain), AV_OPT_TYPE_FLOAT, {.dbl = 1}, 0, 128, FLAGS },

  1129.     { "legend", "draw legend", OFFSET(legend), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, FLAGS },

  1130.     { "rotation", "color rotation", OFFSET(rotation), AV_OPT_TYPE_FLOAT, {.dbl = 0}, -1, 1, FLAGS },

  1131.     { NULL }

  1132. };

  1133. 

  1134. AVFILTER_DEFINE_CLASS(showspectrumpic);

  1135. 

  1136. static void drawtext(AVFrame *pic, int x, int y, const char *txt, int o)

  1137. {

  1138.     const uint8_t *font;

  1139.     int font_height;

  1140.     int i;

  1141. 

  1142.     font = avpriv_cga_font,   font_height =  8;

  1143. 

  1144.     for (i = 0; txt[i]; i++) {

  1145.         int char_y, mask;

  1146. 

  1147.         if (o) {

  1148.             for (char_y = font_height - 1; char_y >= 0; char_y--) {

  1149.                 uint8_t *p = pic->data[0] + (y + i * 10) * pic->linesize[0] + x;

  1150.                 for (mask = 0x80; mask; mask >>= 1) {

  1151.                     if (font[txt[i] * font_height + font_height - 1 - char_y] & mask)

  1152.                         p[char_y] = ~p[char_y];

  1153.                     p += pic->linesize[0];

  1154.                 }

  1155.             }

  1156.         } else {

  1157.             uint8_t *p = pic->data[0] + y*pic->linesize[0] + (x + i*8);

  1158.             for (char_y = 0; char_y < font_height; char_y++) {

  1159.                 for (mask = 0x80; mask; mask >>= 1) {

  1160.                     if (font[txt[i] * font_height + char_y] & mask)

  1161.                         *p = ~(*p);

  1162.                     p++;

  1163.                 }

  1164.                 p += pic->linesize[0] - 8;

  1165.             }

  1166.         }

  1167.     }

  1168. }

  1169. 

  1170. static int showspectrumpic_request_frame(AVFilterLink *outlink)

  1171. {

  1172.     AVFilterContext *ctx = outlink->src;

  1173.     ShowSpectrumContext *s = ctx->priv;

  1174.     AVFilterLink *inlink = ctx->inputs[0];

  1175.     int ret, samples;

  1176. 

  1177.     ret = ff_request_frame(inlink);

  1178.     samples = av_audio_fifo_size(s->fifo);

  1179.     if (ret == AVERROR_EOF && s->outpicref && samples > 0) {

  1180.         int consumed = 0;

  1181.         int y, x = 0, sz = s->orientation == VERTICAL ? s->w : s->h;

  1182.         int ch, spf, spb;

  1183.         AVFrame *fin;

  1184. 

  1185.         spf = s->win_size * (samples / ((s->win_size * sz) * ceil(samples / (float)(s->win_size * sz))));

  1186.         spf = FFMAX(1, spf);

  1187. 

  1188.         spb = (samples / (spf * sz)) * spf;

  1189. 

  1190.         fin = ff_get_audio_buffer(inlink, s->win_size);

  1191.         if (!fin)

  1192.             return AVERROR(ENOMEM);

  1193. 

  1194.         while (x < sz) {

  1195.             ret = av_audio_fifo_peek(s->fifo, (void **)fin->extended_data, s->win_size);

  1196.             if (ret < 0) {

  1197.                 av_frame_free(&fin);

  1198.                 return ret;

  1199.             }

  1200. 

  1201.             av_audio_fifo_drain(s->fifo, spf);

  1202. 

  1203.             if (ret < s->win_size) {

  1204.                 for (ch = 0; ch < s->nb_display_channels; ch++) {

  1205.                     memset(fin->extended_data[ch] + ret * sizeof(float), 0,

  1206.                            (s->win_size - ret) * sizeof(float));

  1207.                 }

  1208.             }

  1209. 

  1210.             ctx->internal->execute(ctx, run_channel_fft, fin, NULL, s->nb_display_channels);

  1211.             acalc_magnitudes(s);

  1212. 

  1213.             consumed += spf;

  1214.             if (consumed >= spb) {

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

  1216. 

  1217.                 scale_magnitudes(s, 1. / (consumed / spf));

  1218.                 plot_spectrum_column(inlink, fin);

  1219.                 consumed = 0;

  1220.                 x++;

  1221.                 for (ch = 0; ch < s->nb_display_channels; ch++)

  1222.                     memset(s->magnitudes[ch], 0, h * sizeof(float));

  1223.             }

  1224.         }

  1225. 

  1226.         av_frame_free(&fin);

  1227.         s->outpicref->pts = 0;

  1228. 

  1229.         if (s->legend) {

  1230.             int multi = (s->mode == SEPARATE && s->color_mode == CHANNEL);

  1231.             float spp = samples / (float)sz;

  1232.             char *text;

  1233.             uint8_t *dst;

  1234.             char chlayout_str[128];

  1235. 

  1236.             av_get_channel_layout_string(chlayout_str, sizeof(chlayout_str), inlink->channels,

  1237.                                          inlink->channel_layout);

  1238. 

  1239.             text = av_asprintf("%d Hz | %s", inlink->sample_rate, chlayout_str);

  1240. 

  1241.             drawtext(s->outpicref, 2, outlink->h - 10, "CREATED BY LIBAVFILTER", 0);

  1242.             drawtext(s->outpicref, outlink->w - 2 - strlen(text) * 10, outlink->h - 10, text, 0);

  1243. 

  1244.             av_freep(&text);

  1245. 

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

  1247.             for (x = 0; x < s->w + 1; x++)

  1248.                 dst[x] = 200;

  1249.             dst = s->outpicref->data[0] + (s->start_y + s->h) * s->outpicref->linesize[0] + s->start_x - 1;

  1250.             for (x = 0; x < s->w + 1; x++)

  1251.                 dst[x] = 200;

  1252.             for (y = 0; y < s->h + 2; y++) {

  1253.                 dst = s->outpicref->data[0] + (y + s->start_y - 1) * s->outpicref->linesize[0];

  1254.                 dst[s->start_x - 1] = 200;

  1255.                 dst[s->start_x + s->w] = 200;

  1256.             }

  1257.             if (s->orientation == VERTICAL) {

  1258.                 int h = s->mode == SEPARATE ? s->h / s->nb_display_channels : s->h;

  1259.                 int hh = s->mode == SEPARATE ? -(s->h % s->nb_display_channels) + 1 : 1;

  1260.                 for (ch = 0; ch < (s->mode == SEPARATE ? s->nb_display_channels : 1); ch++) {

  1261.                     for (y = 0; y < h; y += 20) {

  1262.                         dst = s->outpicref->data[0] + (s->start_y + h * (ch + 1) - y - hh) * s->outpicref->linesize[0];

  1263.                         dst[s->start_x - 2] = 200;

  1264.                         dst[s->start_x + s->w + 1] = 200;

  1265.                     }

  1266.                     for (y = 0; y < h; y += 40) {

  1267.                         dst = s->outpicref->data[0] + (s->start_y + h * (ch + 1) - y - hh) * s->outpicref->linesize[0];

  1268.                         dst[s->start_x - 3] = 200;

  1269.                         dst[s->start_x + s->w + 2] = 200;

  1270.                     }

  1271.                     dst = s->outpicref->data[0] + (s->start_y - 2) * s->outpicref->linesize[0] + s->start_x;

  1272.                     for (x = 0; x < s->w; x+=40)

  1273.                         dst[x] = 200;

  1274.                     dst = s->outpicref->data[0] + (s->start_y - 3) * s->outpicref->linesize[0] + s->start_x;

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

  1276.                         dst[x] = 200;

  1277.                     dst = s->outpicref->data[0] + (s->h + s->start_y + 1) * s->outpicref->linesize[0] + s->start_x;

  1278.                     for (x = 0; x < s->w; x+=40) {

  1279.                         dst[x] = 200;

  1280.                     }

  1281.                     dst = s->outpicref->data[0] + (s->h + s->start_y + 2) * s->outpicref->linesize[0] + s->start_x;

  1282.                     for (x = 0; x < s->w; x+=80) {

  1283.                         dst[x] = 200;

  1284.                     }

  1285.                     for (y = 0; y < h; y += 40) {

  1286.                         float hertz = y * (inlink->sample_rate / 2) / (float)(1 << (int)ceil(log2(h)));

  1287.                         char *units;

  1288. 

  1289.                         if (hertz == 0)

  1290.                             units = av_asprintf("DC");

  1291.                         else

  1292.                             units = av_asprintf("%.2f", hertz);

  1293.                         if (!units)

  1294.                             return AVERROR(ENOMEM);

  1295. 

  1296.                         drawtext(s->outpicref, s->start_x - 8 * strlen(units) - 4, h * (ch + 1) + s->start_y - y - 4 - hh, units, 0);

  1297.                         av_free(units);

  1298.                     }

  1299.                 }

  1300. 

  1301.                 for (x = 0; x < s->w; x+=80) {

  1302.                     float seconds = x * spp / inlink->sample_rate;

  1303.                     char *units;

  1304. 

  1305.                     if (x == 0)

  1306.                         units = av_asprintf("0");

  1307.                     else if (log10(seconds) > 6)

  1308.                         units = av_asprintf("%.2fh", seconds / (60 * 60));

  1309.                     else if (log10(seconds) > 3)

  1310.                         units = av_asprintf("%.2fm", seconds / 60);

  1311.                     else

  1312.                         units = av_asprintf("%.2fs", seconds);

  1313.                     if (!units)

  1314.                         return AVERROR(ENOMEM);

  1315. 

  1316.                     drawtext(s->outpicref, s->start_x + x - 4 * strlen(units), s->h + s->start_y + 6, units, 0);

  1317.                     drawtext(s->outpicref, s->start_x + x - 4 * strlen(units), s->start_y - 12, units, 0);

  1318.                     av_free(units);

  1319.                 }

  1320. 

  1321.                 drawtext(s->outpicref, outlink->w / 2 - 4 * 4, outlink->h - s->start_y / 2, "TIME", 0);

  1322.                 drawtext(s->outpicref, s->start_x / 7, outlink->h / 2 - 14 * 4, "FREQUENCY (Hz)", 1);

  1323.             } else {

  1324.                 int w = s->mode == SEPARATE ? s->w / s->nb_display_channels : s->w;

  1325.                 for (y = 0; y < s->h; y += 20) {

  1326.                     dst = s->outpicref->data[0] + (s->start_y + y) * s->outpicref->linesize[0];

  1327.                     dst[s->start_x - 2] = 200;

  1328.                     dst[s->start_x + s->w + 1] = 200;

  1329.                 }

  1330.                 for (y = 0; y < s->h; y += 40) {

  1331.                     dst = s->outpicref->data[0] + (s->start_y + y) * s->outpicref->linesize[0];

  1332.                     dst[s->start_x - 3] = 200;

  1333.                     dst[s->start_x + s->w + 2] = 200;

  1334.                 }

  1335.                 for (ch = 0; ch < (s->mode == SEPARATE ? s->nb_display_channels : 1); ch++) {

  1336.                     dst = s->outpicref->data[0] + (s->start_y - 2) * s->outpicref->linesize[0] + s->start_x + w * ch;

  1337.                     for (x = 0; x < w; x+=40)

  1338.                         dst[x] = 200;

  1339.                     dst = s->outpicref->data[0] + (s->start_y - 3) * s->outpicref->linesize[0] + s->start_x + w * ch;

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

  1341.                         dst[x] = 200;

  1342.                     dst = s->outpicref->data[0] + (s->h + s->start_y + 1) * s->outpicref->linesize[0] + s->start_x + w * ch;

  1343.                     for (x = 0; x < w; x+=40) {

  1344.                         dst[x] = 200;

  1345.                     }

  1346.                     dst = s->outpicref->data[0] + (s->h + s->start_y + 2) * s->outpicref->linesize[0] + s->start_x + w * ch;

  1347.                     for (x = 0; x < w; x+=80) {

  1348.                         dst[x] = 200;

  1349.                     }

  1350.                     for (x = 0; x < w - 79; x += 80) {

  1351.                         float hertz = x * (inlink->sample_rate / 2) / (float)(1 << (int)ceil(log2(w)));

  1352.                         char *units;

  1353. 

  1354.                         if (hertz == 0)

  1355.                             units = av_asprintf("DC");

  1356.                         else

  1357.                             units = av_asprintf("%.2f", hertz);

  1358.                         if (!units)

  1359.                             return AVERROR(ENOMEM);

  1360. 

  1361.                         drawtext(s->outpicref, s->start_x - 4 * strlen(units) + x + w * ch, s->start_y - 12, units, 0);

  1362.                         drawtext(s->outpicref, s->start_x - 4 * strlen(units) + x + w * ch, s->h + s->start_y + 6, units, 0);

  1363.                         av_free(units);

  1364.                     }

  1365.                 }

  1366.                 for (y = 0; y < s->h; y+=40) {

  1367.                     float seconds = y * spp / inlink->sample_rate;

  1368.                     char *units;

  1369. 

  1370.                     if (x == 0)

  1371.                         units = av_asprintf("0");

  1372.                     else if (log10(seconds) > 6)

  1373.                         units = av_asprintf("%.2fh", seconds / (60 * 60));

  1374.                     else if (log10(seconds) > 3)

  1375.                         units = av_asprintf("%.2fm", seconds / 60);

  1376.                     else

  1377.                         units = av_asprintf("%.2fs", seconds);

  1378.                     if (!units)

  1379.                         return AVERROR(ENOMEM);

  1380. 

  1381.                     drawtext(s->outpicref, s->start_x - 8 * strlen(units) - 4, s->start_y + y - 4, units, 0);

  1382.                     av_free(units);

  1383.                 }

  1384.                 drawtext(s->outpicref, s->start_x / 7, outlink->h / 2 - 4 * 4, "TIME", 1);

  1385.                 drawtext(s->outpicref, outlink->w / 2 - 14 * 4, outlink->h - s->start_y / 2, "FREQUENCY (Hz)", 0);

  1386.             }

  1387. 

  1388.             for (ch = 0; ch < (multi ? s->nb_display_channels : 1); ch++) {

  1389.                 int h = multi ? s->h / s->nb_display_channels : s->h;

  1390. 

  1391.                 for (y = 0; y < h; y++) {

  1392.                     float out[3] = { 0., 127.5, 127.5};

  1393.                     int chn;

  1394. 

  1395.                     for (chn = 0; chn < (s->mode == SEPARATE ? 1 : s->nb_display_channels); chn++) {

  1396.                         float yf, uf, vf;

  1397.                         int channel = (multi) ? s->nb_display_channels - ch - 1 : chn;

  1398.                         float lout[3];

  1399. 

  1400.                         color_range(s, channel, &yf, &uf, &vf);

  1401.                         pick_color(s, yf, uf, vf, y / (float)h, lout);

  1402.                         out[0] += lout[0];

  1403.                         out[1] += lout[1];

  1404.                         out[2] += lout[2];

  1405.                     }

  1406.                     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);

  1407.                     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);

  1408.                     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);

  1409.                 }

  1410. 

  1411.                 for (y = 0; ch == 0 && y < h; y += h / 10) {

  1412.                     float value = 120.0 * log10(1. - y / (float)h);

  1413.                     char *text;

  1414. 

  1415.                     if (value < -120)

  1416.                         break;

  1417.                     text = av_asprintf("%.0f dB", value);

  1418.                     if (!text)

  1419.                         continue;

  1420.                     drawtext(s->outpicref, s->w + s->start_x + 35, s->start_y + y - 5, text, 0);

  1421.                     av_free(text);

  1422.                 }

  1423.             }

  1424.         }

  1425. 

  1426.         ret = ff_filter_frame(outlink, s->outpicref);

  1427.         s->outpicref = NULL;

  1428.     }

  1429. 

  1430.     return ret;

  1431. }

  1432. 

  1433. static int showspectrumpic_filter_frame(AVFilterLink *inlink, AVFrame *insamples)

  1434. {

  1435.     AVFilterContext *ctx = inlink->dst;

  1436.     ShowSpectrumContext *s = ctx->priv;

  1437.     int ret;

  1438. 

  1439.     ret = av_audio_fifo_write(s->fifo, (void **)insamples->extended_data, insamples->nb_samples);

  1440.     av_frame_free(&insamples);

  1441.     return ret;

  1442. }

  1443. 

  1444. static const AVFilterPad showspectrumpic_inputs[] = {

  1445.     {

  1446.         .name         = "default",

  1447.         .type         = AVMEDIA_TYPE_AUDIO,

  1448.         .filter_frame = showspectrumpic_filter_frame,

  1449.     },

  1450.     { NULL }

  1451. };

  1452. 

  1453. static const AVFilterPad showspectrumpic_outputs[] = {

  1454.     {

  1455.         .name          = "default",

  1456.         .type          = AVMEDIA_TYPE_VIDEO,

  1457.         .config_props  = config_output,

  1458.         .request_frame = showspectrumpic_request_frame,

  1459.     },

  1460.     { NULL }

  1461. };

  1462. 

  1463. AVFilter ff_avf_showspectrumpic = {

  1464.     .name          = "showspectrumpic",

  1465.     .description   = NULL_IF_CONFIG_SMALL("Convert input audio to a spectrum video output single picture."),

  1466.     .uninit        = uninit,

  1467.     .query_formats = query_formats,

  1468.     .priv_size     = sizeof(ShowSpectrumContext),

  1469.     .inputs        = showspectrumpic_inputs,

  1470.     .outputs       = showspectrumpic_outputs,

  1471.     .priv_class    = &showspectrumpic_class,

  1472.     .flags         = AVFILTER_FLAG_SLICE_THREADS,

  1473. };

  1474. 

  1475. #endif // CONFIG_SHOWSPECTRUMPIC_FILTER