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

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

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

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

  49. 

  50. typedef struct {

  51.     const AVClass *class;

  52.     int w, h;

  53.     AVFrame *outpicref;

  54.     int nb_display_channels;

  55.     int orientation;

  56.     int channel_width;

  57.     int channel_height;

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

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

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

  61.     int scale;

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

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

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

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

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

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

  68.     float **magnitudes;

  69.     int win_func;

  70.     int win_size;

  71.     double win_scale;

  72.     float overlap;

  73.     float gain;

  74.     int skip_samples;

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

  76.     AVAudioFifo *fifo;

  77.     int64_t pts;

  78.     int single_pic;

  79.     int legend;

  80.     int start_x, start_y;

  81. } ShowSpectrumContext;

  82. 

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

  84. #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

  85. 

  86. static const AVOption showspectrum_options[] = {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  110.         { "4thrt","4th root",    0, AV_OPT_TYPE_CONST, {.i64=FOURTHRT}, 0, 0, FLAGS, "scale" },

  111.         { "5thrt","5th root",    0, AV_OPT_TYPE_CONST, {.i64=FIFTHRT},  0, 0, FLAGS, "scale" },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  137.     { NULL }

  138. };

  139. 

  140. AVFILTER_DEFINE_CLASS(showspectrum);

  141. 

  142. static const struct ColorTable {

  143.     float a, y, u, v;

  144. } color_table[][8] = {

  145.     [INTENSITY] = {

  146.     {    0,                  0,                  0,                   0 },

  147.     { 0.13, .03587126228984074,  .1573300977624594, -.02548747583751842 },

  148.     { 0.30, .18572281794568020,  .1772436246393981,  .17475554840414750 },

  149.     { 0.60, .28184980583656130, -.1593064119945782,  .47132074554608920 },

  150.     { 0.73, .65830621175547810, -.3716070802232764,  .24352759331252930 },

  151.     { 0.78, .76318535758242900, -.4307467689263783,  .16866496622310430 },

  152.     { 0.91, .95336363636363640, -.2045454545454546,  .03313636363636363 },

  153.     {    1,                  1,                  0,                   0 }},

  154.     [RAINBOW] = {

  155.     {    0,                  0,                  0,                   0 },

  156.     { 0.13,            44/256.,     (189-128)/256.,      (138-128)/256. },

  157.     { 0.25,            29/256.,     (186-128)/256.,      (119-128)/256. },

  158.     { 0.38,           119/256.,     (194-128)/256.,       (53-128)/256. },

  159.     { 0.60,           111/256.,      (73-128)/256.,       (59-128)/256. },

  160.     { 0.73,           205/256.,      (19-128)/256.,      (149-128)/256. },

  161.     { 0.86,           135/256.,      (83-128)/256.,      (200-128)/256. },

  162.     {    1,            73/256.,      (95-128)/256.,      (225-128)/256. }},

  163.     [MORELAND] = {

  164.     {    0,            44/256.,     (181-128)/256.,      (112-128)/256. },

  165.     { 0.13,           126/256.,     (177-128)/256.,      (106-128)/256. },

  166.     { 0.25,           164/256.,     (163-128)/256.,      (109-128)/256. },

  167.     { 0.38,           200/256.,     (140-128)/256.,      (120-128)/256. },

  168.     { 0.60,           201/256.,     (117-128)/256.,      (141-128)/256. },

  169.     { 0.73,           177/256.,     (103-128)/256.,      (165-128)/256. },

  170.     { 0.86,           136/256.,     (100-128)/256.,      (183-128)/256. },

  171.     {    1,            68/256.,     (117-128)/256.,      (203-128)/256. }},

  172.     [NEBULAE] = {

  173.     {    0,            10/256.,     (134-128)/256.,      (132-128)/256. },

  174.     { 0.23,            21/256.,     (137-128)/256.,      (130-128)/256. },

  175.     { 0.45,            35/256.,     (134-128)/256.,      (134-128)/256. },

  176.     { 0.57,            51/256.,     (130-128)/256.,      (139-128)/256. },

  177.     { 0.67,           104/256.,     (116-128)/256.,      (162-128)/256. },

  178.     { 0.77,           120/256.,     (105-128)/256.,      (188-128)/256. },

  179.     { 0.87,           140/256.,     (105-128)/256.,      (188-128)/256. },

  180.     {    1,                  1,                  0,                   0 }},

  181.     [FIRE] = {

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

  183.     { 0.23,            44/256.,     (132-128)/256.,      (127-128)/256. },

  184.     { 0.45,            62/256.,     (116-128)/256.,      (140-128)/256. },

  185.     { 0.57,            75/256.,     (105-128)/256.,      (152-128)/256. },

  186.     { 0.67,            95/256.,      (91-128)/256.,      (166-128)/256. },

  187.     { 0.77,           126/256.,      (74-128)/256.,      (172-128)/256. },

  188.     { 0.87,           164/256.,      (73-128)/256.,      (162-128)/256. },

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

  190.     [FIERY] = {

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

  192.     { 0.23,            36/256.,     (116-128)/256.,      (163-128)/256. },

  193.     { 0.45,            52/256.,     (102-128)/256.,      (200-128)/256. },

  194.     { 0.57,           116/256.,      (84-128)/256.,      (196-128)/256. },

  195.     { 0.67,           157/256.,      (67-128)/256.,      (181-128)/256. },

  196.     { 0.77,           193/256.,      (40-128)/256.,      (155-128)/256. },

  197.     { 0.87,           221/256.,     (101-128)/256.,      (134-128)/256. },

  198.     {    1,                  1,                  0,                   0 }},

  199.     [FRUIT] = {

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

  201.     { 0.20,            29/256.,     (136-128)/256.,      (119-128)/256. },

  202.     { 0.30,            60/256.,     (119-128)/256.,       (90-128)/256. },

  203.     { 0.40,            85/256.,      (91-128)/256.,       (85-128)/256. },

  204.     { 0.50,           116/256.,      (70-128)/256.,      (105-128)/256. },

  205.     { 0.60,           151/256.,      (50-128)/256.,      (146-128)/256. },

  206.     { 0.70,           191/256.,      (63-128)/256.,      (178-128)/256. },

  207.     {    1,            98/256.,      (80-128)/256.,      (221-128)/256. }},

  208.     [COOL] = {

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

  210.     {  .15,                  0,                 .5,                 -.5 },

  211.     {    1,                  1,                -.5,                  .5 }},

  212. };

  213. 

  214. static av_cold void uninit(AVFilterContext *ctx)

  215. {

  216.     ShowSpectrumContext *s = ctx->priv;

  217.     int i;

  218. 

  219.     av_freep(&s->combine_buffer);

  220.     av_fft_end(s->fft);

  221.     if (s->fft_data) {

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

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

  224.     }

  225.     av_freep(&s->fft_data);

  226.     av_freep(&s->window_func_lut);

  227.     if (s->magnitudes) {

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

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

  230.     }

  231.     av_freep(&s->magnitudes);

  232.     av_frame_free(&s->outpicref);

  233.     av_audio_fifo_free(s->fifo);

  234. }

  235. 

  236. static int query_formats(AVFilterContext *ctx)

  237. {

  238.     AVFilterFormats *formats = NULL;

  239.     AVFilterChannelLayouts *layouts = NULL;

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

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

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

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

  244.     int ret;

  245. 

  246.     /* set input audio formats */

  247.     formats = ff_make_format_list(sample_fmts);

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

  249.         return ret;

  250. 

  251.     layouts = ff_all_channel_layouts();

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

  253.         return ret;

  254. 

  255.     formats = ff_all_samplerates();

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

  257.         return ret;

  258. 

  259.     /* set output video format */

  260.     formats = ff_make_format_list(pix_fmts);

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

  262.         return ret;

  263. 

  264.     return 0;

  265. }

  266. 

  267. static int config_output(AVFilterLink *outlink)

  268. {

  269.     AVFilterContext *ctx = outlink->src;

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

  271.     ShowSpectrumContext *s = ctx->priv;

  272.     int i, fft_bits, h, w;

  273.     float overlap;

  274. 

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

  276.         s->single_pic = 1;

  277. 

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

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

  280. 

  281.     if (s->legend) {

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

  283.         s->start_y = 64;

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

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

  286.     }

  287. 

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

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

  290.     s->channel_height = h;

  291.     s->channel_width  = w;

  292. 

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

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

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

  296.     } else {

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

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

  299.     }

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

  301. 

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

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

  304.         AVFrame *outpicref;

  305. 

  306.         av_fft_end(s->fft);

  307.         s->fft = av_fft_init(fft_bits, 0);

  308.         if (!s->fft) {

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

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

  311.             return AVERROR(EINVAL);

  312.         }

  313.         s->fft_bits = fft_bits;

  314. 

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

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

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

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

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

  320.         av_freep(&s->fft_data);

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

  322. 

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

  324.         if (!s->magnitudes)

  325.             return AVERROR(ENOMEM);

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

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

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

  329.                 return AVERROR(ENOMEM);

  330.         }

  331. 

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

  333.         if (!s->fft_data)

  334.             return AVERROR(ENOMEM);

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

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

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

  338.                 return AVERROR(ENOMEM);

  339.         }

  340. 

  341.         /* pre-calc windowing function */

  342.         s->window_func_lut =

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

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

  345.         if (!s->window_func_lut)

  346.             return AVERROR(ENOMEM);

  347.         ff_generate_window_func(s->window_func_lut, s->win_size, s->win_func, &overlap);

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

  349.             s->overlap = overlap;

  350.         s->skip_samples = (1. - s->overlap) * s->win_size;

  351.         if (s->skip_samples < 1) {

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

  353.             return AVERROR(EINVAL);

  354.         }

  355. 

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

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

  358.         }

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

  360. 

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

  362.         av_frame_free(&s->outpicref);

  363.         s->outpicref = outpicref =

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

  365.         if (!outpicref)

  366.             return AVERROR(ENOMEM);

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

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

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

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

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

  372.         }

  373.         av_frame_set_color_range(outpicref, AVCOL_RANGE_JPEG);

  374.     }

  375. 

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

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

  378.         s->xpos = 0;

  379. 

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

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

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

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

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

  385. 

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

  387.         s->combine_buffer =

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

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

  390.     } else {

  391.         s->combine_buffer =

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

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

  394.     }

  395. 

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

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

  398. 

  399.     av_audio_fifo_free(s->fifo);

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

  401.     if (!s->fifo)

  402.         return AVERROR(ENOMEM);

  403.     return 0;

  404. }

  405. 

  406. static void run_fft(ShowSpectrumContext *s, AVFrame *fin)

  407. {

  408.     int ch, n;

  409. 

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

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

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

  413. 

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

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

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

  417.         }

  418.     }

  419. 

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

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

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

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

  424.     }

  425. }

  426. 

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

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

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

  430. 

  431. static void calc_magnitudes(ShowSpectrumContext *s)

  432. {

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

  434. 

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

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

  437. 

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

  439.             magnitudes[y] = MAGNITUDE(y, ch);

  440.     }

  441. }

  442. 

  443. static void acalc_magnitudes(ShowSpectrumContext *s)

  444. {

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

  446. 

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

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

  449. 

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

  451.             magnitudes[y] += MAGNITUDE(y, ch);

  452.     }

  453. }

  454. 

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

  456. {

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

  458. 

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

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

  461. 

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

  463.             magnitudes[y] *= scale;

  464.     }

  465. }

  466. 

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

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

  469. {

  470.     switch (s->mode) {

  471.     case COMBINED:

  472.         // reduce range by channel count

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

  474.         switch (s->color_mode) {

  475.         case RAINBOW:

  476.         case MORELAND:

  477.         case NEBULAE:

  478.         case FIRE:

  479.         case FIERY:

  480.         case FRUIT:

  481.         case COOL:

  482.         case INTENSITY:

  483.             *uf = *yf;

  484.             *vf = *yf;

  485.             break;

  486.         case CHANNEL:

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

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

  489.             *uf = *yf * M_PI;

  490.             *vf = *yf * M_PI;

  491.             break;

  492.         default:

  493.             av_assert0(0);

  494.         }

  495.         break;

  496.     case SEPARATE:

  497.         // full range

  498.         *yf = 256.0f;

  499.         *uf = 256.0f;

  500.         *vf = 256.0f;

  501.         break;

  502.     default:

  503.         av_assert0(0);

  504.     }

  505. 

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

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

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

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

  510.         } else {

  511.             *uf = 0.0f;

  512.             *vf = 0.0f;

  513.         }

  514.     }

  515.     *uf *= s->saturation;

  516.     *vf *= s->saturation;

  517. }

  518. 

  519. static void pick_color(ShowSpectrumContext *s,

  520.                        float yf, float uf, float vf,

  521.                        float a, float *out)

  522. {

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

  524.         const int cm = s->color_mode;

  525.         float y, u, v;

  526.         int i;

  527. 

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

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

  530.                 break;

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

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

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

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

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

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

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

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

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

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

  541.         } else {

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

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

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

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

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

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

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

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

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

  551.         }

  552. 

  553.         out[0] += y * yf;

  554.         out[1] += u * uf;

  555.         out[2] += v * vf;

  556.     } else {

  557.         out[0] += a * yf;

  558.         out[1] += a * uf;

  559.         out[2] += a * vf;

  560.     }

  561. }

  562. 

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

  564. {

  565.     int y;

  566. 

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

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

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

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

  571.     }

  572. }

  573. 

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

  575. {

  576.     int ret;

  577.     AVFilterContext *ctx = inlink->dst;

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

  579.     ShowSpectrumContext *s = ctx->priv;

  580.     AVFrame *outpicref = s->outpicref;

  581.     const double w = s->win_scale;

  582.     const float g = s->gain;

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

  584. 

  585.     int ch, plane, x, y;

  586. 

  587.     /* fill a new spectrum column */

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

  589.     clear_combine_buffer(s, s->orientation == VERTICAL ? s->h : s->w);

  590. 

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

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

  593.         float yf, uf, vf;

  594. 

  595.         /* decide color range */

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

  597. 

  598.         /* draw the channel */

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

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

  601.             float *out = &s->combine_buffer[3 * row];

  602. 

  603.             /* get magnitude */

  604.             float a = g * w * magnitudes[y];

  605. 

  606.             /* apply scale */

  607.             switch (s->scale) {

  608.             case LINEAR:

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

  610.                 break;

  611.             case SQRT:

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

  613.                 break;

  614.             case CBRT:

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

  616.                 break;

  617.             case FOURTHRT:

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

  619.                 break;

  620.             case FIFTHRT:

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

  622.                 break;

  623.             case LOG:

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

  625.                 break;

  626.             default:

  627.                 av_assert0(0);

  628.             }

  629. 

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

  631.         }

  632.     }

  633. 

  634.     av_frame_make_writable(s->outpicref);

  635.     /* copy to output */

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

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

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

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

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

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

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

  643.                 }

  644.             }

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

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

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

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

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

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

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

  652.                 }

  653.             }

  654.             s->xpos = 0;

  655.         }

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

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

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

  659.                          s->xpos;

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

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

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

  663.             }

  664.         }

  665.     } else {

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

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

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

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

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

  671.                             s->w);

  672.                 }

  673.             }

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

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

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

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

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

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

  680.                             s->w);

  681.                 }

  682.             }

  683.             s->xpos = 0;

  684.         }

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

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

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

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

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

  690.                 p++;

  691.             }

  692.         }

  693.     }

  694. 

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

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

  697. 

  698.     s->xpos++;

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

  700.         s->xpos = 0;

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

  702.         s->xpos = 0;

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

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

  705.         if (ret < 0)

  706.             return ret;

  707.     }

  708. 

  709.     return s->win_size;

  710. }

  711. 

  712. #if CONFIG_SHOWSPECTRUM_FILTER

  713. 

  714. static int request_frame(AVFilterLink *outlink)

  715. {

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

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

  718.     unsigned i;

  719.     int ret;

  720. 

  721.     ret = ff_request_frame(inlink);

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

  723.         s->outpicref) {

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

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

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

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

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

  729.             }

  730.         } else {

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

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

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

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

  735.             }

  736.         }

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

  738.         s->outpicref = NULL;

  739.     }

  740. 

  741.     return ret;

  742. }

  743. 

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

  745. {

  746.     AVFilterContext *ctx = inlink->dst;

  747.     ShowSpectrumContext *s = ctx->priv;

  748.     AVFrame *fin = NULL;

  749.     int ret = 0;

  750. 

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

  752.     av_frame_free(&insamples);

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

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

  755.         if (!fin) {

  756.             ret = AVERROR(ENOMEM);

  757.             goto fail;

  758.         }

  759. 

  760.         fin->pts = s->pts;

  761.         s->pts += s->skip_samples;

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

  763.         if (ret < 0)

  764.             goto fail;

  765. 

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

  767. 

  768.         run_fft(s, fin);

  769.         calc_magnitudes(s);

  770. 

  771.         ret = plot_spectrum_column(inlink, fin);

  772.         av_frame_free(&fin);

  773.         av_audio_fifo_drain(s->fifo, s->skip_samples);

  774.         if (ret < 0)

  775.             goto fail;

  776.     }

  777. 

  778. fail:

  779.     av_frame_free(&fin);

  780.     return ret;

  781. }

  782. 

  783. static const AVFilterPad showspectrum_inputs[] = {

  784.     {

  785.         .name         = "default",

  786.         .type         = AVMEDIA_TYPE_AUDIO,

  787.         .filter_frame = filter_frame,

  788.     },

  789.     { NULL }

  790. };

  791. 

  792. static const AVFilterPad showspectrum_outputs[] = {

  793.     {

  794.         .name          = "default",

  795.         .type          = AVMEDIA_TYPE_VIDEO,

  796.         .config_props  = config_output,

  797.         .request_frame = request_frame,

  798.     },

  799.     { NULL }

  800. };

  801. 

  802. AVFilter ff_avf_showspectrum = {

  803.     .name          = "showspectrum",

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

  805.     .uninit        = uninit,

  806.     .query_formats = query_formats,

  807.     .priv_size     = sizeof(ShowSpectrumContext),

  808.     .inputs        = showspectrum_inputs,

  809.     .outputs       = showspectrum_outputs,

  810.     .priv_class    = &showspectrum_class,

  811. };

  812. #endif // CONFIG_SHOWSPECTRUM_FILTER

  813. 

  814. #if CONFIG_SHOWSPECTRUMPIC_FILTER

  815. 

  816. static const AVOption showspectrumpic_options[] = {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  835.         { "4thrt","4th root",    0, AV_OPT_TYPE_CONST, {.i64=FOURTHRT}, 0, 0, FLAGS, "scale" },

  836.         { "5thrt","5th root",    0, AV_OPT_TYPE_CONST, {.i64=FIFTHRT},  0, 0, FLAGS, "scale" },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  862.     { NULL }

  863. };

  864. 

  865. AVFILTER_DEFINE_CLASS(showspectrumpic);

  866. 

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

  868. {

  869.     const uint8_t *font;

  870.     int font_height;

  871.     int i;

  872. 

  873.     font = avpriv_cga_font,   font_height =  8;

  874. 

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

  876.         int char_y, mask;

  877. 

  878.         if (o) {

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

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

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

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

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

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

  885.                 }

  886.             }

  887.         } else {

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

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

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

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

  892.                         *p = ~(*p);

  893.                     p++;

  894.                 }

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

  896.             }

  897.         }

  898.     }

  899. }

  900. 

  901. static int showspectrumpic_request_frame(AVFilterLink *outlink)

  902. {

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

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

  905.     int ret;

  906. 

  907.     ret = ff_request_frame(inlink);

  908.     if (ret == AVERROR_EOF && s->outpicref) {

  909.         int samples = av_audio_fifo_size(s->fifo);

  910.         int consumed = 0;

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

  912.         int ch, spf, spb;

  913.         AVFrame *fin;

  914. 

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

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

  917. 

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

  919.         if (!fin)

  920.             return AVERROR(ENOMEM);

  921. 

  922.         while (x < sz) {

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

  924.             if (ret < 0) {

  925.                 av_frame_free(&fin);

  926.                 return ret;

  927.             }

  928. 

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

  930. 

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

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

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

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

  935.                 }

  936.             }

  937. 

  938.             run_fft(s, fin);

  939.             acalc_magnitudes(s);

  940. 

  941.             consumed += spf;

  942.             if (consumed >= spb) {

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

  944. 

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

  946.                 plot_spectrum_column(inlink, fin);

  947.                 consumed = 0;

  948.                 x++;

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

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

  951.             }

  952.         }

  953. 

  954.         av_frame_free(&fin);

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

  956. 

  957.         if (s->legend) {

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

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

  960.             uint8_t *dst;

  961. 

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

  963. 

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

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

  966.                 dst[x] = 200;

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

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

  969.                 dst[x] = 200;

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

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

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

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

  974.             }

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

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

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

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

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

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

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

  982.                     }

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

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

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

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

  987.                     }

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

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

  990.                         dst[x] = 200;

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

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

  993.                         dst[x] = 200;

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

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

  996.                         dst[x] = 200;

  997.                     }

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

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

  1000.                         dst[x] = 200;

  1001.                     }

  1002.                     for (y = 0; y < h; y += 40) {

  1003.                         float hz = y * (inlink->sample_rate / 2) / (float)(1 << (int)ceil(log2(h)));

  1004.                         char *units;

  1005. 

  1006.                         if (hz == 0)

  1007.                             units = av_asprintf("DC");

  1008.                         else

  1009.                             units = av_asprintf("%.2f", hz);

  1010.                         if (!units)

  1011.                             return AVERROR(ENOMEM);

  1012. 

  1013.                         drawtext(s->outpicref, s->start_x - 8 * strlen(units) - 4, h * (ch + 1) + s->start_y - y - 4, units, 0);

  1014.                         av_free(units);

  1015.                     }

  1016.                 }

  1017. 

  1018.                 for (x = 0; x < s->w; x+=80) {

  1019.                     float seconds = x * spp / inlink->sample_rate;

  1020.                     char *units;

  1021. 

  1022.                     if (x == 0)

  1023.                         units = av_asprintf("0");

  1024.                     else if (log10(seconds) > 6)

  1025.                         units = av_asprintf("%.2fh", seconds / (60 * 60));

  1026.                     else if (log10(seconds) > 3)

  1027.                         units = av_asprintf("%.2fm", seconds / 60);

  1028.                     else

  1029.                         units = av_asprintf("%.2fs", seconds);

  1030.                     if (!units)

  1031.                         return AVERROR(ENOMEM);

  1032. 

  1033.                     drawtext(s->outpicref, s->start_x + x - 4 * strlen(units), s->h + s->start_y + 6, units, 0);

  1034.                     drawtext(s->outpicref, s->start_x + x - 4 * strlen(units), s->start_y - 12, units, 0);

  1035.                     av_free(units);

  1036.                 }

  1037. 

  1038.                 drawtext(s->outpicref, outlink->w / 2 - 4 * 4, outlink->h - s->start_y / 2, "TIME", 0);

  1039.                 drawtext(s->outpicref, s->start_x / 7, outlink->h / 2 - 14 * 4, "FREQUENCY (Hz)", 1);

  1040.             } else {

  1041.                 int w = s->mode == SEPARATE ? s->w / s->nb_display_channels : s->w;

  1042.                 for (y = 0; y < s->h; y += 20) {

  1043.                     dst = s->outpicref->data[0] + (s->start_y + y) * s->outpicref->linesize[0];

  1044.                     dst[s->start_x - 2] = 200;

  1045.                     dst[s->start_x + s->w + 1] = 200;

  1046.                 }

  1047.                 for (y = 0; y < s->h; y += 40) {

  1048.                     dst = s->outpicref->data[0] + (s->start_y + y) * s->outpicref->linesize[0];

  1049.                     dst[s->start_x - 3] = 200;

  1050.                     dst[s->start_x + s->w + 2] = 200;

  1051.                 }

  1052.                 for (ch = 0; ch < (s->mode == SEPARATE ? s->nb_display_channels : 1); ch++) {

  1053.                     dst = s->outpicref->data[0] + (s->start_y - 2) * s->outpicref->linesize[0] + s->start_x + w * ch;

  1054.                     for (x = 0; x < w; x+=40)

  1055.                         dst[x] = 200;

  1056.                     dst = s->outpicref->data[0] + (s->start_y - 3) * s->outpicref->linesize[0] + s->start_x + w * ch;

  1057.                     for (x = 0; x < w; x+=80)

  1058.                         dst[x] = 200;

  1059.                     dst = s->outpicref->data[0] + (s->h + s->start_y + 1) * s->outpicref->linesize[0] + s->start_x + w * ch;

  1060.                     for (x = 0; x < w; x+=40) {

  1061.                         dst[x] = 200;

  1062.                     }

  1063.                     dst = s->outpicref->data[0] + (s->h + s->start_y + 2) * s->outpicref->linesize[0] + s->start_x + w * ch;

  1064.                     for (x = 0; x < w; x+=80) {

  1065.                         dst[x] = 200;

  1066.                     }

  1067.                     for (x = 0; x < w; x += 80) {

  1068.                         float hz = x * (inlink->sample_rate / 2) / (float)(1 << (int)ceil(log2(w)));

  1069.                         char *units;

  1070. 

  1071.                         if (hz == 0)

  1072.                             units = av_asprintf("DC");

  1073.                         else

  1074.                             units = av_asprintf("%.2f", hz);

  1075.                         if (!units)

  1076.                             return AVERROR(ENOMEM);

  1077. 

  1078.                         drawtext(s->outpicref, s->start_x - 4 * strlen(units) + x + w * ch, s->start_y - 12, units, 0);

  1079.                         drawtext(s->outpicref, s->start_x - 4 * strlen(units) + x + w * ch, s->h + s->start_y + 6, units, 0);

  1080.                         av_free(units);

  1081.                     }

  1082.                 }

  1083.                 for (y = 0; y < s->h; y+=40) {

  1084.                     float seconds = y * spp / inlink->sample_rate;

  1085.                     char *units;

  1086. 

  1087.                     if (x == 0)

  1088.                         units = av_asprintf("0");

  1089.                     else if (log10(seconds) > 6)

  1090.                         units = av_asprintf("%.2fh", seconds / (60 * 60));

  1091.                     else if (log10(seconds) > 3)

  1092.                         units = av_asprintf("%.2fm", seconds / 60);

  1093.                     else

  1094.                         units = av_asprintf("%.2fs", seconds);

  1095.                     if (!units)

  1096.                         return AVERROR(ENOMEM);

  1097. 

  1098.                     drawtext(s->outpicref, s->start_x - 8 * strlen(units) - 4, s->start_y + y - 4, units, 0);

  1099.                     av_free(units);

  1100.                 }

  1101.                 drawtext(s->outpicref, s->start_x / 7, outlink->h / 2 - 4 * 4, "TIME", 1);

  1102.                 drawtext(s->outpicref, outlink->w / 2 - 14 * 4, outlink->h - s->start_y / 2, "FREQUENCY (Hz)", 0);

  1103.             }

  1104. 

  1105.             for (ch = 0; ch < (multi ? s->nb_display_channels : 1); ch++) {

  1106.                 int h = multi ? s->h / s->nb_display_channels : s->h;

  1107. 

  1108.                 for (y = 0; y < h; y++) {

  1109.                     float out[3] = { 0., 127.5, 127.5};

  1110.                     int chn;

  1111. 

  1112.                     for (chn = 0; chn < (s->mode == SEPARATE ? 1 : s->nb_display_channels); chn++) {

  1113.                         float yf, uf, vf;

  1114.                         int channel = (multi) ? s->nb_display_channels - ch - 1 : chn;

  1115. 

  1116.                         color_range(s, channel, &yf, &uf, &vf);

  1117.                         pick_color(s, yf, uf, vf, y / (float)h, out);

  1118.                     }

  1119.                     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);

  1120.                     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);

  1121.                     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);

  1122.                 }

  1123.             }

  1124.         }

  1125. 

  1126.         ret = ff_filter_frame(outlink, s->outpicref);

  1127.         s->outpicref = NULL;

  1128.     }

  1129. 

  1130.     return ret;

  1131. }

  1132. 

  1133. static int showspectrumpic_filter_frame(AVFilterLink *inlink, AVFrame *insamples)

  1134. {

  1135.     AVFilterContext *ctx = inlink->dst;

  1136.     ShowSpectrumContext *s = ctx->priv;

  1137.     int ret;

  1138. 

  1139.     ret = av_audio_fifo_write(s->fifo, (void **)insamples->extended_data, insamples->nb_samples);

  1140.     av_frame_free(&insamples);

  1141.     return ret;

  1142. }

  1143. 

  1144. static const AVFilterPad showspectrumpic_inputs[] = {

  1145.     {

  1146.         .name         = "default",

  1147.         .type         = AVMEDIA_TYPE_AUDIO,

  1148.         .filter_frame = showspectrumpic_filter_frame,

  1149.     },

  1150.     { NULL }

  1151. };

  1152. 

  1153. static const AVFilterPad showspectrumpic_outputs[] = {

  1154.     {

  1155.         .name          = "default",

  1156.         .type          = AVMEDIA_TYPE_VIDEO,

  1157.         .config_props  = config_output,

  1158.         .request_frame = showspectrumpic_request_frame,

  1159.     },

  1160.     { NULL }

  1161. };

  1162. 

  1163. AVFilter ff_avf_showspectrumpic = {

  1164.     .name          = "showspectrumpic",

  1165.     .description   = NULL_IF_CONFIG_SMALL("Convert input audio to a spectrum video output single picture."),

  1166.     .uninit        = uninit,

  1167.     .query_formats = query_formats,

  1168.     .priv_size     = sizeof(ShowSpectrumContext),

  1169.     .inputs        = showspectrumpic_inputs,

  1170.     .outputs       = showspectrumpic_outputs,

  1171.     .priv_class    = &showspectrumpic_class,

  1172. };

  1173. 

  1174. #endif // CONFIG_SHOWSPECTRUMPIC_FILTER