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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, 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 data;

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

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

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

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

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

  71.     float **magnitudes;

  72.     float **phases;

  73.     int win_func;

  74.     int win_size;

  75.     double win_scale;

  76.     float overlap;

  77.     float gain;

  78.     int hop_size;

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

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

  81.     AVAudioFifo *fifo;

  82.     int64_t pts;

  83.     int single_pic;

  84.     int legend;

  85.     int start_x, start_y;

  86. } ShowSpectrumContext;

  87. 

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

  89. #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

  90. 

  91. static const AVOption showspectrum_options[] = {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  117.         { "4thrt","4th root",    0, AV_OPT_TYPE_CONST, {.i64=FOURTHRT}, 0, 0, FLAGS, "scale" },

  118.         { "5thrt","5th root",    0, AV_OPT_TYPE_CONST, {.i64=FIFTHRT},  0, 0, FLAGS, "scale" },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  150.     { NULL }

  151. };

  152. 

  153. AVFILTER_DEFINE_CLASS(showspectrum);

  154. 

  155. static const struct ColorTable {

  156.     float a, y, u, v;

  157. } color_table[][8] = {

  158.     [INTENSITY] = {

  159.     {    0,                  0,                  0,                   0 },

  160.     { 0.13, .03587126228984074,  .1573300977624594, -.02548747583751842 },

  161.     { 0.30, .18572281794568020,  .1772436246393981,  .17475554840414750 },

  162.     { 0.60, .28184980583656130, -.1593064119945782,  .47132074554608920 },

  163.     { 0.73, .65830621175547810, -.3716070802232764,  .24352759331252930 },

  164.     { 0.78, .76318535758242900, -.4307467689263783,  .16866496622310430 },

  165.     { 0.91, .95336363636363640, -.2045454545454546,  .03313636363636363 },

  166.     {    1,                  1,                  0,                   0 }},

  167.     [RAINBOW] = {

  168.     {    0,                  0,                  0,                   0 },

  169.     { 0.13,            44/256.,     (189-128)/256.,      (138-128)/256. },

  170.     { 0.25,            29/256.,     (186-128)/256.,      (119-128)/256. },

  171.     { 0.38,           119/256.,     (194-128)/256.,       (53-128)/256. },

  172.     { 0.60,           111/256.,      (73-128)/256.,       (59-128)/256. },

  173.     { 0.73,           205/256.,      (19-128)/256.,      (149-128)/256. },

  174.     { 0.86,           135/256.,      (83-128)/256.,      (200-128)/256. },

  175.     {    1,            73/256.,      (95-128)/256.,      (225-128)/256. }},

  176.     [MORELAND] = {

  177.     {    0,            44/256.,     (181-128)/256.,      (112-128)/256. },

  178.     { 0.13,           126/256.,     (177-128)/256.,      (106-128)/256. },

  179.     { 0.25,           164/256.,     (163-128)/256.,      (109-128)/256. },

  180.     { 0.38,           200/256.,     (140-128)/256.,      (120-128)/256. },

  181.     { 0.60,           201/256.,     (117-128)/256.,      (141-128)/256. },

  182.     { 0.73,           177/256.,     (103-128)/256.,      (165-128)/256. },

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

  184.     {    1,            68/256.,     (117-128)/256.,      (203-128)/256. }},

  185.     [NEBULAE] = {

  186.     {    0,            10/256.,     (134-128)/256.,      (132-128)/256. },

  187.     { 0.23,            21/256.,     (137-128)/256.,      (130-128)/256. },

  188.     { 0.45,            35/256.,     (134-128)/256.,      (134-128)/256. },

  189.     { 0.57,            51/256.,     (130-128)/256.,      (139-128)/256. },

  190.     { 0.67,           104/256.,     (116-128)/256.,      (162-128)/256. },

  191.     { 0.77,           120/256.,     (105-128)/256.,      (188-128)/256. },

  192.     { 0.87,           140/256.,     (105-128)/256.,      (188-128)/256. },

  193.     {    1,                  1,                  0,                   0 }},

  194.     [FIRE] = {

  195.     {    0,                  0,                  0,                   0 },

  196.     { 0.23,            44/256.,     (132-128)/256.,      (127-128)/256. },

  197.     { 0.45,            62/256.,     (116-128)/256.,      (140-128)/256. },

  198.     { 0.57,            75/256.,     (105-128)/256.,      (152-128)/256. },

  199.     { 0.67,            95/256.,      (91-128)/256.,      (166-128)/256. },

  200.     { 0.77,           126/256.,      (74-128)/256.,      (172-128)/256. },

  201.     { 0.87,           164/256.,      (73-128)/256.,      (162-128)/256. },

  202.     {    1,                  1,                  0,                   0 }},

  203.     [FIERY] = {

  204.     {    0,                  0,                  0,                   0 },

  205.     { 0.23,            36/256.,     (116-128)/256.,      (163-128)/256. },

  206.     { 0.45,            52/256.,     (102-128)/256.,      (200-128)/256. },

  207.     { 0.57,           116/256.,      (84-128)/256.,      (196-128)/256. },

  208.     { 0.67,           157/256.,      (67-128)/256.,      (181-128)/256. },

  209.     { 0.77,           193/256.,      (40-128)/256.,      (155-128)/256. },

  210.     { 0.87,           221/256.,     (101-128)/256.,      (134-128)/256. },

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

  212.     [FRUIT] = {

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

  214.     { 0.20,            29/256.,     (136-128)/256.,      (119-128)/256. },

  215.     { 0.30,            60/256.,     (119-128)/256.,       (90-128)/256. },

  216.     { 0.40,            85/256.,      (91-128)/256.,       (85-128)/256. },

  217.     { 0.50,           116/256.,      (70-128)/256.,      (105-128)/256. },

  218.     { 0.60,           151/256.,      (50-128)/256.,      (146-128)/256. },

  219.     { 0.70,           191/256.,      (63-128)/256.,      (178-128)/256. },

  220.     {    1,            98/256.,      (80-128)/256.,      (221-128)/256. }},

  221.     [COOL] = {

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

  223.     {  .15,                  0,                 .5,                 -.5 },

  224.     {    1,                  1,                -.5,                  .5 }},

  225. };

  226. 

  227. static av_cold void uninit(AVFilterContext *ctx)

  228. {

  229.     ShowSpectrumContext *s = ctx->priv;

  230.     int i;

  231. 

  232.     av_freep(&s->combine_buffer);

  233.     if (s->fft) {

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

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

  236.     }

  237.     av_freep(&s->fft);

  238.     if (s->fft_data) {

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

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

  241.     }

  242.     av_freep(&s->fft_data);

  243.     if (s->color_buffer) {

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

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

  246.     }

  247.     av_freep(&s->color_buffer);

  248.     av_freep(&s->window_func_lut);

  249.     if (s->magnitudes) {

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

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

  252.     }

  253.     av_freep(&s->magnitudes);

  254.     av_frame_free(&s->outpicref);

  255.     av_audio_fifo_free(s->fifo);

  256.     if (s->phases) {

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

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

  259.     }

  260.     av_freep(&s->phases);

  261. }

  262. 

  263. static int query_formats(AVFilterContext *ctx)

  264. {

  265.     AVFilterFormats *formats = NULL;

  266.     AVFilterChannelLayouts *layouts = NULL;

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

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

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

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

  271.     int ret;

  272. 

  273.     /* set input audio formats */

  274.     formats = ff_make_format_list(sample_fmts);

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

  276.         return ret;

  277. 

  278.     layouts = ff_all_channel_layouts();

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

  280.         return ret;

  281. 

  282.     formats = ff_all_samplerates();

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

  284.         return ret;

  285. 

  286.     /* set output video format */

  287.     formats = ff_make_format_list(pix_fmts);

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

  289.         return ret;

  290. 

  291.     return 0;

  292. }

  293. 

  294. static int config_output(AVFilterLink *outlink)

  295. {

  296.     AVFilterContext *ctx = outlink->src;

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

  298.     ShowSpectrumContext *s = ctx->priv;

  299.     int i, fft_bits, h, w;

  300.     float overlap;

  301. 

  302.     s->pts = AV_NOPTS_VALUE;

  303. 

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

  305.         s->single_pic = 1;

  306. 

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

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

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

  310. 

  311.     if (s->legend) {

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

  313.         s->start_y = 64;

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

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

  316.     }

  317. 

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

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

  320.     s->channel_height = h;

  321.     s->channel_width  = w;

  322. 

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

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

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

  326.     } else {

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

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

  329.     }

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

  331. 

  332.     if (!s->fft) {

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

  334.         if (!s->fft)

  335.             return AVERROR(ENOMEM);

  336.     }

  337. 

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

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

  340.         AVFrame *outpicref;

  341. 

  342.         s->fft_bits = fft_bits;

  343. 

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

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

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

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

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

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

  350.         }

  351.         av_freep(&s->fft_data);

  352. 

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

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

  355.             s->fft[i] = av_fft_init(fft_bits, 0);

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

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

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

  359.                 return AVERROR(EINVAL);

  360.             }

  361.         }

  362. 

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

  364.         if (!s->magnitudes)

  365.             return AVERROR(ENOMEM);

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

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

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

  369.                 return AVERROR(ENOMEM);

  370.         }

  371. 

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

  373.         if (!s->phases)

  374.             return AVERROR(ENOMEM);

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

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

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

  378.                 return AVERROR(ENOMEM);

  379.         }

  380. 

  381.         av_freep(&s->color_buffer);

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

  383.         if (!s->color_buffer)

  384.             return AVERROR(ENOMEM);

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

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

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

  388.                 return AVERROR(ENOMEM);

  389.         }

  390. 

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

  392.         if (!s->fft_data)

  393.             return AVERROR(ENOMEM);

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

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

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

  397.                 return AVERROR(ENOMEM);

  398.         }

  399. 

  400.         /* pre-calc windowing function */

  401.         s->window_func_lut =

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

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

  404.         if (!s->window_func_lut)

  405.             return AVERROR(ENOMEM);

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

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

  408.             s->overlap = overlap;

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

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

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

  412.             return AVERROR(EINVAL);

  413.         }

  414. 

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

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

  417.         }

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

  419. 

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

  421.         av_frame_free(&s->outpicref);

  422.         s->outpicref = outpicref =

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

  424.         if (!outpicref)

  425.             return AVERROR(ENOMEM);

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

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

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

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

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

  431.         }

  432.         outpicref->color_range = AVCOL_RANGE_JPEG;

  433.     }

  434. 

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

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

  437.         s->xpos = 0;

  438. 

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

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

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

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

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

  444. 

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

  446.         s->combine_buffer =

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

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

  449.     } else {

  450.         s->combine_buffer =

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

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

  453.     }

  454. 

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

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

  457. 

  458.     av_audio_fifo_free(s->fifo);

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

  460.     if (!s->fifo)

  461.         return AVERROR(ENOMEM);

  462.     return 0;

  463. }

  464. 

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

  466. {

  467.     ShowSpectrumContext *s = ctx->priv;

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

  469.     AVFrame *fin = arg;

  470.     const int ch = jobnr;

  471.     int n;

  472. 

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

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

  475. 

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

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

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

  479.     }

  480. 

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

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

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

  484. 

  485.     return 0;

  486. }

  487. 

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

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

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

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

  492. 

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

  494. {

  495.     ShowSpectrumContext *s = ctx->priv;

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

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

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

  499.     const int ch = jobnr;

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

  501. 

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

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

  504. 

  505.     return 0;

  506. }

  507. 

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

  509. {

  510.     ShowSpectrumContext *s = ctx->priv;

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

  512.     const int ch = jobnr;

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

  514.     int y;

  515. 

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

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

  518. 

  519.     return 0;

  520. }

  521. 

  522. static void acalc_magnitudes(ShowSpectrumContext *s)

  523. {

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

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

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

  527. 

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

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

  530. 

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

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

  533.     }

  534. }

  535. 

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

  537. {

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

  539. 

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

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

  542. 

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

  544.             magnitudes[y] *= scale;

  545.     }

  546. }

  547. 

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

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

  550. {

  551.     switch (s->mode) {

  552.     case COMBINED:

  553.         // reduce range by channel count

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

  555.         switch (s->color_mode) {

  556.         case RAINBOW:

  557.         case MORELAND:

  558.         case NEBULAE:

  559.         case FIRE:

  560.         case FIERY:

  561.         case FRUIT:

  562.         case COOL:

  563.         case INTENSITY:

  564.             *uf = *yf;

  565.             *vf = *yf;

  566.             break;

  567.         case CHANNEL:

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

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

  570.             *uf = *yf * M_PI;

  571.             *vf = *yf * M_PI;

  572.             break;

  573.         default:

  574.             av_assert0(0);

  575.         }

  576.         break;

  577.     case SEPARATE:

  578.         // full range

  579.         *yf = 256.0f;

  580.         *uf = 256.0f;

  581.         *vf = 256.0f;

  582.         break;

  583.     default:

  584.         av_assert0(0);

  585.     }

  586. 

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

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

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

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

  591.         } else {

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

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

  594.         }

  595.     } else {

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

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

  598.     }

  599. 

  600.     *uf *= s->saturation;

  601.     *vf *= s->saturation;

  602. }

  603. 

  604. static void pick_color(ShowSpectrumContext *s,

  605.                        float yf, float uf, float vf,

  606.                        float a, float *out)

  607. {

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

  609.         const int cm = s->color_mode;

  610.         float y, u, v;

  611.         int i;

  612. 

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

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

  615.                 break;

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

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

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

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

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

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

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

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

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

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

  626.         } else {

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

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

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

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

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

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

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

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

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

  636.         }

  637. 

  638.         out[0] = y * yf;

  639.         out[1] = u * uf;

  640.         out[2] = v * vf;

  641.     } else {

  642.         out[0] = a * yf;

  643.         out[1] = a * uf;

  644.         out[2] = a * vf;

  645.     }

  646. }

  647. 

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

  649. {

  650.     int y;

  651. 

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

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

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

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

  656.     }

  657. }

  658. 

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

  660. {

  661.     ShowSpectrumContext *s = ctx->priv;

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

  663.     const int ch = jobnr;

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

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

  666.     float yf, uf, vf;

  667.     int y;

  668. 

  669.     /* decide color range */

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

  671. 

  672.     /* draw the channel */

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

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

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

  676.         float a;

  677. 

  678.         switch (s->data) {

  679.         case D_MAGNITUDE:

  680.             /* get magnitude */

  681.             a = magnitudes[y];

  682.             break;

  683.         case D_PHASE:

  684.             /* get phase */

  685.             a = phases[y];

  686.             break;

  687.         default:

  688.             av_assert0(0);

  689.         }

  690. 

  691.         /* apply scale */

  692.         switch (s->scale) {

  693.         case LINEAR:

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

  695.             break;

  696.         case SQRT:

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

  698.             break;

  699.         case CBRT:

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

  701.             break;

  702.         case FOURTHRT:

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

  704.             break;

  705.         case FIFTHRT:

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

  707.             break;

  708.         case LOG:

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

  710.             break;

  711.         default:

  712.             av_assert0(0);

  713.         }

  714. 

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

  716.     }

  717. 

  718.     return 0;

  719. }

  720. 

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

  722. {

  723.     AVFilterContext *ctx = inlink->dst;

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

  725.     ShowSpectrumContext *s = ctx->priv;

  726.     AVFrame *outpicref = s->outpicref;

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

  728. 

  729.     /* fill a new spectrum column */

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

  731.     clear_combine_buffer(s, z);

  732. 

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

  734. 

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

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

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

  738.         }

  739.     }

  740. 

  741.     av_frame_make_writable(s->outpicref);

  742.     /* copy to output */

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

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

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

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

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

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

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

  750.                 }

  751.             }

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

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

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

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

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

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

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

  759.                 }

  760.             }

  761.             s->xpos = 0;

  762.         }

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

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

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

  766.                          s->xpos;

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

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

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

  770.             }

  771.         }

  772.     } else {

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

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

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

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

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

  778.                             s->w);

  779.                 }

  780.             }

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

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

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

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

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

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

  787.                             s->w);

  788.                 }

  789.             }

  790.             s->xpos = 0;

  791.         }

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

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

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

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

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

  797.                 p++;

  798.             }

  799.         }

  800.     }

  801. 

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

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

  804. 

  805.     s->xpos++;

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

  807.         s->xpos = 0;

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

  809.         s->xpos = 0;

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

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

  812.         if (ret < 0)

  813.             return ret;

  814.     }

  815. 

  816.     return s->win_size;

  817. }

  818. 

  819. #if CONFIG_SHOWSPECTRUM_FILTER

  820. 

  821. static int request_frame(AVFilterLink *outlink)

  822. {

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

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

  825.     unsigned i;

  826.     int ret;

  827. 

  828.     ret = ff_request_frame(inlink);

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

  830.         s->outpicref) {

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

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

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

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

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

  836.             }

  837.         } else {

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

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

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

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

  842.             }

  843.         }

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

  845.         s->outpicref = NULL;

  846.     }

  847. 

  848.     return ret;

  849. }

  850. 

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

  852. {

  853.     AVFilterContext *ctx = inlink->dst;

  854.     ShowSpectrumContext *s = ctx->priv;

  855.     AVFrame *fin = NULL;

  856.     int ret = 0, consumed = 0;

  857. 

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

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

  860. 

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

  862.     av_frame_free(&insamples);

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

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

  865.         if (!fin) {

  866.             ret = AVERROR(ENOMEM);

  867.             goto fail;

  868.         }

  869. 

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

  871.         consumed += s->hop_size;

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

  873.         if (ret < 0)

  874.             goto fail;

  875. 

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

  877. 

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

  879. 

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

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

  882. 

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

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

  885. 

  886.         ret = plot_spectrum_column(inlink, fin);

  887.         av_frame_free(&fin);

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

  889.         if (ret < 0)

  890.             goto fail;

  891.     }

  892. 

  893. fail:

  894.     s->pts = AV_NOPTS_VALUE;

  895.     av_frame_free(&fin);

  896.     return ret;

  897. }

  898. 

  899. static const AVFilterPad showspectrum_inputs[] = {

  900.     {

  901.         .name         = "default",

  902.         .type         = AVMEDIA_TYPE_AUDIO,

  903.         .filter_frame = filter_frame,

  904.     },

  905.     { NULL }

  906. };

  907. 

  908. static const AVFilterPad showspectrum_outputs[] = {

  909.     {

  910.         .name          = "default",

  911.         .type          = AVMEDIA_TYPE_VIDEO,

  912.         .config_props  = config_output,

  913.         .request_frame = request_frame,

  914.     },

  915.     { NULL }

  916. };

  917. 

  918. AVFilter ff_avf_showspectrum = {

  919.     .name          = "showspectrum",

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

  921.     .uninit        = uninit,

  922.     .query_formats = query_formats,

  923.     .priv_size     = sizeof(ShowSpectrumContext),

  924.     .inputs        = showspectrum_inputs,

  925.     .outputs       = showspectrum_outputs,

  926.     .priv_class    = &showspectrum_class,

  927.     .flags         = AVFILTER_FLAG_SLICE_THREADS,

  928. };

  929. #endif // CONFIG_SHOWSPECTRUM_FILTER

  930. 

  931. #if CONFIG_SHOWSPECTRUMPIC_FILTER

  932. 

  933. static const AVOption showspectrumpic_options[] = {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  954.         { "4thrt","4th root",    0, AV_OPT_TYPE_CONST, {.i64=FOURTHRT}, 0, 0, FLAGS, "scale" },

  955.         { "5thrt","5th root",    0, AV_OPT_TYPE_CONST, {.i64=FIFTHRT},  0, 0, FLAGS, "scale" },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  984.     { NULL }

  985. };

  986. 

  987. AVFILTER_DEFINE_CLASS(showspectrumpic);

  988. 

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

  990. {

  991.     const uint8_t *font;

  992.     int font_height;

  993.     int i;

  994. 

  995.     font = avpriv_cga_font,   font_height =  8;

  996. 

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

  998.         int char_y, mask;

  999. 

  1000.         if (o) {

  1001.             for (char_y = font_height - 1; char_y >= 0; char_y--) {

  1002.                 uint8_t *p = pic->data[0] + (y + i * 10) * pic->linesize[0] + x;

  1003.                 for (mask = 0x80; mask; mask >>= 1) {

  1004.                     if (font[txt[i] * font_height + font_height - 1 - char_y] & mask)

  1005.                         p[char_y] = ~p[char_y];

  1006.                     p += pic->linesize[0];

  1007.                 }

  1008.             }

  1009.         } else {

  1010.             uint8_t *p = pic->data[0] + y*pic->linesize[0] + (x + i*8);

  1011.             for (char_y = 0; char_y < font_height; char_y++) {

  1012.                 for (mask = 0x80; mask; mask >>= 1) {

  1013.                     if (font[txt[i] * font_height + char_y] & mask)

  1014.                         *p = ~(*p);

  1015.                     p++;

  1016.                 }

  1017.                 p += pic->linesize[0] - 8;

  1018.             }

  1019.         }

  1020.     }

  1021. }

  1022. 

  1023. static int showspectrumpic_request_frame(AVFilterLink *outlink)

  1024. {

  1025.     AVFilterContext *ctx = outlink->src;

  1026.     ShowSpectrumContext *s = ctx->priv;

  1027.     AVFilterLink *inlink = ctx->inputs[0];

  1028.     int ret, samples;

  1029. 

  1030.     ret = ff_request_frame(inlink);

  1031.     samples = av_audio_fifo_size(s->fifo);

  1032.     if (ret == AVERROR_EOF && s->outpicref && samples > 0) {

  1033.         int consumed = 0;

  1034.         int y, x = 0, sz = s->orientation == VERTICAL ? s->w : s->h;

  1035.         int ch, spf, spb;

  1036.         AVFrame *fin;

  1037. 

  1038.         spf = s->win_size * (samples / ((s->win_size * sz) * ceil(samples / (float)(s->win_size * sz))));

  1039.         spf = FFMAX(1, spf);

  1040. 

  1041.         spb = (samples / (spf * sz)) * spf;

  1042. 

  1043.         fin = ff_get_audio_buffer(inlink, s->win_size);

  1044.         if (!fin)

  1045.             return AVERROR(ENOMEM);

  1046. 

  1047.         while (x < sz) {

  1048.             ret = av_audio_fifo_peek(s->fifo, (void **)fin->extended_data, s->win_size);

  1049.             if (ret < 0) {

  1050.                 av_frame_free(&fin);

  1051.                 return ret;

  1052.             }

  1053. 

  1054.             av_audio_fifo_drain(s->fifo, spf);

  1055. 

  1056.             if (ret < s->win_size) {

  1057.                 for (ch = 0; ch < s->nb_display_channels; ch++) {

  1058.                     memset(fin->extended_data[ch] + ret * sizeof(float), 0,

  1059.                            (s->win_size - ret) * sizeof(float));

  1060.                 }

  1061.             }

  1062. 

  1063.             ctx->internal->execute(ctx, run_channel_fft, fin, NULL, s->nb_display_channels);

  1064.             acalc_magnitudes(s);

  1065. 

  1066.             consumed += spf;

  1067.             if (consumed >= spb) {

  1068.                 int h = s->orientation == VERTICAL ? s->h : s->w;

  1069. 

  1070.                 scale_magnitudes(s, 1. / (consumed / spf));

  1071.                 plot_spectrum_column(inlink, fin);

  1072.                 consumed = 0;

  1073.                 x++;

  1074.                 for (ch = 0; ch < s->nb_display_channels; ch++)

  1075.                     memset(s->magnitudes[ch], 0, h * sizeof(float));

  1076.             }

  1077.         }

  1078. 

  1079.         av_frame_free(&fin);

  1080.         s->outpicref->pts = 0;

  1081. 

  1082.         if (s->legend) {

  1083.             int multi = (s->mode == SEPARATE && s->color_mode == CHANNEL);

  1084.             float spp = samples / (float)sz;

  1085.             uint8_t *dst;

  1086. 

  1087.             drawtext(s->outpicref, 2, outlink->h - 10, "CREATED BY LIBAVFILTER", 0);

  1088. 

  1089.             dst = s->outpicref->data[0] + (s->start_y - 1) * s->outpicref->linesize[0] + s->start_x - 1;

  1090.             for (x = 0; x < s->w + 1; x++)

  1091.                 dst[x] = 200;

  1092.             dst = s->outpicref->data[0] + (s->start_y + s->h) * s->outpicref->linesize[0] + s->start_x - 1;

  1093.             for (x = 0; x < s->w + 1; x++)

  1094.                 dst[x] = 200;

  1095.             for (y = 0; y < s->h + 2; y++) {

  1096.                 dst = s->outpicref->data[0] + (y + s->start_y - 1) * s->outpicref->linesize[0];

  1097.                 dst[s->start_x - 1] = 200;

  1098.                 dst[s->start_x + s->w] = 200;

  1099.             }

  1100.             if (s->orientation == VERTICAL) {

  1101.                 int h = s->mode == SEPARATE ? s->h / s->nb_display_channels : s->h;

  1102.                 for (ch = 0; ch < (s->mode == SEPARATE ? s->nb_display_channels : 1); ch++) {

  1103.                     for (y = 0; y < h; y += 20) {

  1104.                         dst = s->outpicref->data[0] + (s->start_y + h * (ch + 1) - y - 1) * s->outpicref->linesize[0];

  1105.                         dst[s->start_x - 2] = 200;

  1106.                         dst[s->start_x + s->w + 1] = 200;

  1107.                     }

  1108.                     for (y = 0; y < h; y += 40) {

  1109.                         dst = s->outpicref->data[0] + (s->start_y + h * (ch + 1) - y - 1) * s->outpicref->linesize[0];

  1110.                         dst[s->start_x - 3] = 200;

  1111.                         dst[s->start_x + s->w + 2] = 200;

  1112.                     }

  1113.                     dst = s->outpicref->data[0] + (s->start_y - 2) * s->outpicref->linesize[0] + s->start_x;

  1114.                     for (x = 0; x < s->w; x+=40)

  1115.                         dst[x] = 200;

  1116.                     dst = s->outpicref->data[0] + (s->start_y - 3) * s->outpicref->linesize[0] + s->start_x;

  1117.                     for (x = 0; x < s->w; x+=80)

  1118.                         dst[x] = 200;

  1119.                     dst = s->outpicref->data[0] + (s->h + s->start_y + 1) * s->outpicref->linesize[0] + s->start_x;

  1120.                     for (x = 0; x < s->w; x+=40) {

  1121.                         dst[x] = 200;

  1122.                     }

  1123.                     dst = s->outpicref->data[0] + (s->h + s->start_y + 2) * s->outpicref->linesize[0] + s->start_x;

  1124.                     for (x = 0; x < s->w; x+=80) {

  1125.                         dst[x] = 200;

  1126.                     }

  1127.                     for (y = 0; y < h; y += 40) {

  1128.                         float hertz = y * (inlink->sample_rate / 2) / (float)(1 << (int)ceil(log2(h)));

  1129.                         char *units;

  1130. 

  1131.                         if (hertz == 0)

  1132.                             units = av_asprintf("DC");

  1133.                         else

  1134.                             units = av_asprintf("%.2f", hertz);

  1135.                         if (!units)

  1136.                             return AVERROR(ENOMEM);

  1137. 

  1138.                         drawtext(s->outpicref, s->start_x - 8 * strlen(units) - 4, h * (ch + 1) + s->start_y - y - 4, units, 0);

  1139.                         av_free(units);

  1140.                     }

  1141.                 }

  1142. 

  1143.                 for (x = 0; x < s->w; x+=80) {

  1144.                     float seconds = x * spp / inlink->sample_rate;

  1145.                     char *units;

  1146. 

  1147.                     if (x == 0)

  1148.                         units = av_asprintf("0");

  1149.                     else if (log10(seconds) > 6)

  1150.                         units = av_asprintf("%.2fh", seconds / (60 * 60));

  1151.                     else if (log10(seconds) > 3)

  1152.                         units = av_asprintf("%.2fm", seconds / 60);

  1153.                     else

  1154.                         units = av_asprintf("%.2fs", seconds);

  1155.                     if (!units)

  1156.                         return AVERROR(ENOMEM);

  1157. 

  1158.                     drawtext(s->outpicref, s->start_x + x - 4 * strlen(units), s->h + s->start_y + 6, units, 0);

  1159.                     drawtext(s->outpicref, s->start_x + x - 4 * strlen(units), s->start_y - 12, units, 0);

  1160.                     av_free(units);

  1161.                 }

  1162. 

  1163.                 drawtext(s->outpicref, outlink->w / 2 - 4 * 4, outlink->h - s->start_y / 2, "TIME", 0);

  1164.                 drawtext(s->outpicref, s->start_x / 7, outlink->h / 2 - 14 * 4, "FREQUENCY (Hz)", 1);

  1165.             } else {

  1166.                 int w = s->mode == SEPARATE ? s->w / s->nb_display_channels : s->w;

  1167.                 for (y = 0; y < s->h; y += 20) {

  1168.                     dst = s->outpicref->data[0] + (s->start_y + y) * s->outpicref->linesize[0];

  1169.                     dst[s->start_x - 2] = 200;

  1170.                     dst[s->start_x + s->w + 1] = 200;

  1171.                 }

  1172.                 for (y = 0; y < s->h; y += 40) {

  1173.                     dst = s->outpicref->data[0] + (s->start_y + y) * s->outpicref->linesize[0];

  1174.                     dst[s->start_x - 3] = 200;

  1175.                     dst[s->start_x + s->w + 2] = 200;

  1176.                 }

  1177.                 for (ch = 0; ch < (s->mode == SEPARATE ? s->nb_display_channels : 1); ch++) {

  1178.                     dst = s->outpicref->data[0] + (s->start_y - 2) * s->outpicref->linesize[0] + s->start_x + w * ch;

  1179.                     for (x = 0; x < w; x+=40)

  1180.                         dst[x] = 200;

  1181.                     dst = s->outpicref->data[0] + (s->start_y - 3) * s->outpicref->linesize[0] + s->start_x + w * ch;

  1182.                     for (x = 0; x < w; x+=80)

  1183.                         dst[x] = 200;

  1184.                     dst = s->outpicref->data[0] + (s->h + s->start_y + 1) * s->outpicref->linesize[0] + s->start_x + w * ch;

  1185.                     for (x = 0; x < w; x+=40) {

  1186.                         dst[x] = 200;

  1187.                     }

  1188.                     dst = s->outpicref->data[0] + (s->h + s->start_y + 2) * s->outpicref->linesize[0] + s->start_x + w * ch;

  1189.                     for (x = 0; x < w; x+=80) {

  1190.                         dst[x] = 200;

  1191.                     }

  1192.                     for (x = 0; x < w; x += 80) {

  1193.                         float hertz = x * (inlink->sample_rate / 2) / (float)(1 << (int)ceil(log2(w)));

  1194.                         char *units;

  1195. 

  1196.                         if (hertz == 0)

  1197.                             units = av_asprintf("DC");

  1198.                         else

  1199.                             units = av_asprintf("%.2f", hertz);

  1200.                         if (!units)

  1201.                             return AVERROR(ENOMEM);

  1202. 

  1203.                         drawtext(s->outpicref, s->start_x - 4 * strlen(units) + x + w * ch, s->start_y - 12, units, 0);

  1204.                         drawtext(s->outpicref, s->start_x - 4 * strlen(units) + x + w * ch, s->h + s->start_y + 6, units, 0);

  1205.                         av_free(units);

  1206.                     }

  1207.                 }

  1208.                 for (y = 0; y < s->h; y+=40) {

  1209.                     float seconds = y * spp / inlink->sample_rate;

  1210.                     char *units;

  1211. 

  1212.                     if (x == 0)

  1213.                         units = av_asprintf("0");

  1214.                     else if (log10(seconds) > 6)

  1215.                         units = av_asprintf("%.2fh", seconds / (60 * 60));

  1216.                     else if (log10(seconds) > 3)

  1217.                         units = av_asprintf("%.2fm", seconds / 60);

  1218.                     else

  1219.                         units = av_asprintf("%.2fs", seconds);

  1220.                     if (!units)

  1221.                         return AVERROR(ENOMEM);

  1222. 

  1223.                     drawtext(s->outpicref, s->start_x - 8 * strlen(units) - 4, s->start_y + y - 4, units, 0);

  1224.                     av_free(units);

  1225.                 }

  1226.                 drawtext(s->outpicref, s->start_x / 7, outlink->h / 2 - 4 * 4, "TIME", 1);

  1227.                 drawtext(s->outpicref, outlink->w / 2 - 14 * 4, outlink->h - s->start_y / 2, "FREQUENCY (Hz)", 0);

  1228.             }

  1229. 

  1230.             for (ch = 0; ch < (multi ? s->nb_display_channels : 1); ch++) {

  1231.                 int h = multi ? s->h / s->nb_display_channels : s->h;

  1232. 

  1233.                 for (y = 0; y < h; y++) {

  1234.                     float out[3] = { 0., 127.5, 127.5};

  1235.                     int chn;

  1236. 

  1237.                     for (chn = 0; chn < (s->mode == SEPARATE ? 1 : s->nb_display_channels); chn++) {

  1238.                         float yf, uf, vf;

  1239.                         int channel = (multi) ? s->nb_display_channels - ch - 1 : chn;

  1240.                         float lout[3];

  1241. 

  1242.                         color_range(s, channel, &yf, &uf, &vf);

  1243.                         pick_color(s, yf, uf, vf, y / (float)h, lout);

  1244.                         out[0] += lout[0];

  1245.                         out[1] += lout[1];

  1246.                         out[2] += lout[2];

  1247.                     }

  1248.                     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);

  1249.                     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);

  1250.                     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);

  1251.                 }

  1252. 

  1253.                 for (y = 0; ch == 0 && y < h; y += h / 10) {

  1254.                     float value = 120.0 * log10(1. - y / (float)h);

  1255.                     char *text;

  1256. 

  1257.                     if (value < -120)

  1258.                         break;

  1259.                     text = av_asprintf("%.0f dB", value);

  1260.                     if (!text)

  1261.                         continue;

  1262.                     drawtext(s->outpicref, s->w + s->start_x + 35, s->start_y + y - 5, text, 0);

  1263.                     av_free(text);

  1264.                 }

  1265.             }

  1266.         }

  1267. 

  1268.         ret = ff_filter_frame(outlink, s->outpicref);

  1269.         s->outpicref = NULL;

  1270.     }

  1271. 

  1272.     return ret;

  1273. }

  1274. 

  1275. static int showspectrumpic_filter_frame(AVFilterLink *inlink, AVFrame *insamples)

  1276. {

  1277.     AVFilterContext *ctx = inlink->dst;

  1278.     ShowSpectrumContext *s = ctx->priv;

  1279.     int ret;

  1280. 

  1281.     ret = av_audio_fifo_write(s->fifo, (void **)insamples->extended_data, insamples->nb_samples);

  1282.     av_frame_free(&insamples);

  1283.     return ret;

  1284. }

  1285. 

  1286. static const AVFilterPad showspectrumpic_inputs[] = {

  1287.     {

  1288.         .name         = "default",

  1289.         .type         = AVMEDIA_TYPE_AUDIO,

  1290.         .filter_frame = showspectrumpic_filter_frame,

  1291.     },

  1292.     { NULL }

  1293. };

  1294. 

  1295. static const AVFilterPad showspectrumpic_outputs[] = {

  1296.     {

  1297.         .name          = "default",

  1298.         .type          = AVMEDIA_TYPE_VIDEO,

  1299.         .config_props  = config_output,

  1300.         .request_frame = showspectrumpic_request_frame,

  1301.     },

  1302.     { NULL }

  1303. };

  1304. 

  1305. AVFilter ff_avf_showspectrumpic = {

  1306.     .name          = "showspectrumpic",

  1307.     .description   = NULL_IF_CONFIG_SMALL("Convert input audio to a spectrum video output single picture."),

  1308.     .uninit        = uninit,

  1309.     .query_formats = query_formats,

  1310.     .priv_size     = sizeof(ShowSpectrumContext),

  1311.     .inputs        = showspectrumpic_inputs,

  1312.     .outputs       = showspectrumpic_outputs,

  1313.     .priv_class    = &showspectrumpic_class,

  1314.     .flags         = AVFILTER_FLAG_SLICE_THREADS,

  1315. };

  1316. 

  1317. #endif // CONFIG_SHOWSPECTRUMPIC_FILTER