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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 {

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

  303.         s->single_pic = 1;

  304. 

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

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

  307. 

  308.     if (s->legend) {

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

  310.         s->start_y = 64;

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

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

  313.     }

  314. 

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

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

  317.     s->channel_height = h;

  318.     s->channel_width  = w;

  319. 

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

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

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

  323.     } else {

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

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

  326.     }

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

  328. 

  329.     if (!s->fft) {

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

  331.         if (!s->fft)

  332.             return AVERROR(ENOMEM);

  333.     }

  334. 

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

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

  337.         AVFrame *outpicref;

  338. 

  339.         s->fft_bits = fft_bits;

  340. 

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

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

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

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

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

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

  347.         }

  348.         av_freep(&s->fft_data);

  349. 

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

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

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

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

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

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

  356.                 return AVERROR(EINVAL);

  357.             }

  358.         }

  359. 

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

  361.         if (!s->magnitudes)

  362.             return AVERROR(ENOMEM);

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

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

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

  366.                 return AVERROR(ENOMEM);

  367.         }

  368. 

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

  370.         if (!s->phases)

  371.             return AVERROR(ENOMEM);

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

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

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

  375.                 return AVERROR(ENOMEM);

  376.         }

  377. 

  378.         av_freep(&s->color_buffer);

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

  380.         if (!s->color_buffer)

  381.             return AVERROR(ENOMEM);

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

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

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

  385.                 return AVERROR(ENOMEM);

  386.         }

  387. 

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

  389.         if (!s->fft_data)

  390.             return AVERROR(ENOMEM);

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

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

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

  394.                 return AVERROR(ENOMEM);

  395.         }

  396. 

  397.         /* pre-calc windowing function */

  398.         s->window_func_lut =

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

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

  401.         if (!s->window_func_lut)

  402.             return AVERROR(ENOMEM);

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

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

  405.             s->overlap = overlap;

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

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

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

  409.             return AVERROR(EINVAL);

  410.         }

  411. 

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

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

  414.         }

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

  416. 

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

  418.         av_frame_free(&s->outpicref);

  419.         s->outpicref = outpicref =

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

  421.         if (!outpicref)

  422.             return AVERROR(ENOMEM);

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

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

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

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

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

  428.         }

  429.         av_frame_set_color_range(outpicref, AVCOL_RANGE_JPEG);

  430.     }

  431. 

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

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

  434.         s->xpos = 0;

  435. 

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

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

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

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

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

  441. 

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

  443.         s->combine_buffer =

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

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

  446.     } else {

  447.         s->combine_buffer =

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

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

  450.     }

  451. 

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

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

  454. 

  455.     av_audio_fifo_free(s->fifo);

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

  457.     if (!s->fifo)

  458.         return AVERROR(ENOMEM);

  459.     return 0;

  460. }

  461. 

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

  463. {

  464.     ShowSpectrumContext *s = ctx->priv;

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

  466.     AVFrame *fin = arg;

  467.     const int ch = jobnr;

  468.     int n;

  469. 

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

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

  472. 

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

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

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

  476.     }

  477. 

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

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

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

  481. 

  482.     return 0;

  483. }

  484. 

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

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

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

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

  489. 

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

  491. {

  492.     ShowSpectrumContext *s = ctx->priv;

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

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

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

  496.     const int ch = jobnr;

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

  498. 

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

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

  501. 

  502.     return 0;

  503. }

  504. 

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

  506. {

  507.     ShowSpectrumContext *s = ctx->priv;

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

  509.     const int ch = jobnr;

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

  511.     int y;

  512. 

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

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

  515. 

  516.     return 0;

  517. }

  518. 

  519. static void acalc_magnitudes(ShowSpectrumContext *s)

  520. {

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

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

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

  524. 

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

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

  527. 

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

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

  530.     }

  531. }

  532. 

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

  534. {

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

  536. 

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

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

  539. 

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

  541.             magnitudes[y] *= scale;

  542.     }

  543. }

  544. 

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

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

  547. {

  548.     switch (s->mode) {

  549.     case COMBINED:

  550.         // reduce range by channel count

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

  552.         switch (s->color_mode) {

  553.         case RAINBOW:

  554.         case MORELAND:

  555.         case NEBULAE:

  556.         case FIRE:

  557.         case FIERY:

  558.         case FRUIT:

  559.         case COOL:

  560.         case INTENSITY:

  561.             *uf = *yf;

  562.             *vf = *yf;

  563.             break;

  564.         case CHANNEL:

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

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

  567.             *uf = *yf * M_PI;

  568.             *vf = *yf * M_PI;

  569.             break;

  570.         default:

  571.             av_assert0(0);

  572.         }

  573.         break;

  574.     case SEPARATE:

  575.         // full range

  576.         *yf = 256.0f;

  577.         *uf = 256.0f;

  578.         *vf = 256.0f;

  579.         break;

  580.     default:

  581.         av_assert0(0);

  582.     }

  583. 

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

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

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

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

  588.         } else {

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

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

  591.         }

  592.     } else {

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

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

  595.     }

  596. 

  597.     *uf *= s->saturation;

  598.     *vf *= s->saturation;

  599. }

  600. 

  601. static void pick_color(ShowSpectrumContext *s,

  602.                        float yf, float uf, float vf,

  603.                        float a, float *out)

  604. {

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

  606.         const int cm = s->color_mode;

  607.         float y, u, v;

  608.         int i;

  609. 

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

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

  612.                 break;

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

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

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

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

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

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

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

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

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

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

  623.         } else {

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

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

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

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

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

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

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

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

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

  633.         }

  634. 

  635.         out[0] = y * yf;

  636.         out[1] = u * uf;

  637.         out[2] = v * vf;

  638.     } else {

  639.         out[0] = a * yf;

  640.         out[1] = a * uf;

  641.         out[2] = a * vf;

  642.     }

  643. }

  644. 

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

  646. {

  647.     int y;

  648. 

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

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

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

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

  653.     }

  654. }

  655. 

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

  657. {

  658.     ShowSpectrumContext *s = ctx->priv;

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

  660.     const int ch = jobnr;

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

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

  663.     float yf, uf, vf;

  664.     int y;

  665. 

  666.     /* decide color range */

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

  668. 

  669.     /* draw the channel */

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

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

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

  673.         float a;

  674. 

  675.         switch (s->data) {

  676.         case D_MAGNITUDE:

  677.             /* get magnitude */

  678.             a = magnitudes[y];

  679.             break;

  680.         case D_PHASE:

  681.             /* get phase */

  682.             a = phases[y];

  683.             break;

  684.         default:

  685.             av_assert0(0);

  686.         }

  687. 

  688.         /* apply scale */

  689.         switch (s->scale) {

  690.         case LINEAR:

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

  692.             break;

  693.         case SQRT:

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

  695.             break;

  696.         case CBRT:

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

  698.             break;

  699.         case FOURTHRT:

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

  701.             break;

  702.         case FIFTHRT:

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

  704.             break;

  705.         case LOG:

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

  707.             break;

  708.         default:

  709.             av_assert0(0);

  710.         }

  711. 

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

  713.     }

  714. 

  715.     return 0;

  716. }

  717. 

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

  719. {

  720.     AVFilterContext *ctx = inlink->dst;

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

  722.     ShowSpectrumContext *s = ctx->priv;

  723.     AVFrame *outpicref = s->outpicref;

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

  725. 

  726.     /* fill a new spectrum column */

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

  728.     clear_combine_buffer(s, z);

  729. 

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

  731. 

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

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

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

  735.         }

  736.     }

  737. 

  738.     av_frame_make_writable(s->outpicref);

  739.     /* copy to output */

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

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

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

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

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

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

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

  747.                 }

  748.             }

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

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

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

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

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

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

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

  756.                 }

  757.             }

  758.             s->xpos = 0;

  759.         }

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

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

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

  763.                          s->xpos;

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

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

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

  767.             }

  768.         }

  769.     } else {

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

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

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

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

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

  775.                             s->w);

  776.                 }

  777.             }

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

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

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

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

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

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

  784.                             s->w);

  785.                 }

  786.             }

  787.             s->xpos = 0;

  788.         }

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

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

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

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

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

  794.                 p++;

  795.             }

  796.         }

  797.     }

  798. 

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

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

  801. 

  802.     s->xpos++;

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

  804.         s->xpos = 0;

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

  806.         s->xpos = 0;

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

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

  809.         if (ret < 0)

  810.             return ret;

  811.     }

  812. 

  813.     return s->win_size;

  814. }

  815. 

  816. #if CONFIG_SHOWSPECTRUM_FILTER

  817. 

  818. static int request_frame(AVFilterLink *outlink)

  819. {

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

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

  822.     unsigned i;

  823.     int ret;

  824. 

  825.     ret = ff_request_frame(inlink);

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

  827.         s->outpicref) {

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

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

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

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

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

  833.             }

  834.         } else {

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

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

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

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

  839.             }

  840.         }

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

  842.         s->outpicref = NULL;

  843.     }

  844. 

  845.     return ret;

  846. }

  847. 

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

  849. {

  850.     AVFilterContext *ctx = inlink->dst;

  851.     ShowSpectrumContext *s = ctx->priv;

  852.     AVFrame *fin = NULL;

  853.     int ret = 0, consumed = 0;

  854. 

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

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

  857. 

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

  859.     av_frame_free(&insamples);

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

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

  862.         if (!fin) {

  863.             ret = AVERROR(ENOMEM);

  864.             goto fail;

  865.         }

  866. 

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

  868.         consumed += s->hop_size;

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

  870.         if (ret < 0)

  871.             goto fail;

  872. 

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

  874. 

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

  876. 

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

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

  879. 

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

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

  882. 

  883.         ret = plot_spectrum_column(inlink, fin);

  884.         av_frame_free(&fin);

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

  886.         if (ret < 0)

  887.             goto fail;

  888.     }

  889. 

  890. fail:

  891.     s->pts = AV_NOPTS_VALUE;

  892.     av_frame_free(&fin);

  893.     return ret;

  894. }

  895. 

  896. static const AVFilterPad showspectrum_inputs[] = {

  897.     {

  898.         .name         = "default",

  899.         .type         = AVMEDIA_TYPE_AUDIO,

  900.         .filter_frame = filter_frame,

  901.     },

  902.     { NULL }

  903. };

  904. 

  905. static const AVFilterPad showspectrum_outputs[] = {

  906.     {

  907.         .name          = "default",

  908.         .type          = AVMEDIA_TYPE_VIDEO,

  909.         .config_props  = config_output,

  910.         .request_frame = request_frame,

  911.     },

  912.     { NULL }

  913. };

  914. 

  915. AVFilter ff_avf_showspectrum = {

  916.     .name          = "showspectrum",

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

  918.     .uninit        = uninit,

  919.     .query_formats = query_formats,

  920.     .priv_size     = sizeof(ShowSpectrumContext),

  921.     .inputs        = showspectrum_inputs,

  922.     .outputs       = showspectrum_outputs,

  923.     .priv_class    = &showspectrum_class,

  924.     .flags         = AVFILTER_FLAG_SLICE_THREADS,

  925. };

  926. #endif // CONFIG_SHOWSPECTRUM_FILTER

  927. 

  928. #if CONFIG_SHOWSPECTRUMPIC_FILTER

  929. 

  930. static const AVOption showspectrumpic_options[] = {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  951.         { "4thrt","4th root",    0, AV_OPT_TYPE_CONST, {.i64=FOURTHRT}, 0, 0, FLAGS, "scale" },

  952.         { "5thrt","5th root",    0, AV_OPT_TYPE_CONST, {.i64=FIFTHRT},  0, 0, FLAGS, "scale" },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  981.     { NULL }

  982. };

  983. 

  984. AVFILTER_DEFINE_CLASS(showspectrumpic);

  985. 

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

  987. {

  988.     const uint8_t *font;

  989.     int font_height;

  990.     int i;

  991. 

  992.     font = avpriv_cga_font,   font_height =  8;

  993. 

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

  995.         int char_y, mask;

  996. 

  997.         if (o) {

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

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

  1000.                 for (mask = 0x80; mask; mask >>= 1) {

  1001.                     if (font[txt[i] * font_height + font_height - 1 - char_y] & mask)

  1002.                         p[char_y] = ~p[char_y];

  1003.                     p += pic->linesize[0];

  1004.                 }

  1005.             }

  1006.         } else {

  1007.             uint8_t *p = pic->data[0] + y*pic->linesize[0] + (x + i*8);

  1008.             for (char_y = 0; char_y < font_height; char_y++) {

  1009.                 for (mask = 0x80; mask; mask >>= 1) {

  1010.                     if (font[txt[i] * font_height + char_y] & mask)

  1011.                         *p = ~(*p);

  1012.                     p++;

  1013.                 }

  1014.                 p += pic->linesize[0] - 8;

  1015.             }

  1016.         }

  1017.     }

  1018. }

  1019. 

  1020. static int showspectrumpic_request_frame(AVFilterLink *outlink)

  1021. {

  1022.     AVFilterContext *ctx = outlink->src;

  1023.     ShowSpectrumContext *s = ctx->priv;

  1024.     AVFilterLink *inlink = ctx->inputs[0];

  1025.     int ret, samples;

  1026. 

  1027.     ret = ff_request_frame(inlink);

  1028.     samples = av_audio_fifo_size(s->fifo);

  1029.     if (ret == AVERROR_EOF && s->outpicref && samples > 0) {

  1030.         int consumed = 0;

  1031.         int y, x = 0, sz = s->orientation == VERTICAL ? s->w : s->h;

  1032.         int ch, spf, spb;

  1033.         AVFrame *fin;

  1034. 

  1035.         spf = s->win_size * (samples / ((s->win_size * sz) * ceil(samples / (float)(s->win_size * sz))));

  1036.         spf = FFMAX(1, spf);

  1037. 

  1038.         spb = (samples / (spf * sz)) * spf;

  1039. 

  1040.         fin = ff_get_audio_buffer(inlink, s->win_size);

  1041.         if (!fin)

  1042.             return AVERROR(ENOMEM);

  1043. 

  1044.         while (x < sz) {

  1045.             ret = av_audio_fifo_peek(s->fifo, (void **)fin->extended_data, s->win_size);

  1046.             if (ret < 0) {

  1047.                 av_frame_free(&fin);

  1048.                 return ret;

  1049.             }

  1050. 

  1051.             av_audio_fifo_drain(s->fifo, spf);

  1052. 

  1053.             if (ret < s->win_size) {

  1054.                 for (ch = 0; ch < s->nb_display_channels; ch++) {

  1055.                     memset(fin->extended_data[ch] + ret * sizeof(float), 0,

  1056.                            (s->win_size - ret) * sizeof(float));

  1057.                 }

  1058.             }

  1059. 

  1060.             ctx->internal->execute(ctx, run_channel_fft, fin, NULL, s->nb_display_channels);

  1061.             acalc_magnitudes(s);

  1062. 

  1063.             consumed += spf;

  1064.             if (consumed >= spb) {

  1065.                 int h = s->orientation == VERTICAL ? s->h : s->w;

  1066. 

  1067.                 scale_magnitudes(s, 1. / (consumed / spf));

  1068.                 plot_spectrum_column(inlink, fin);

  1069.                 consumed = 0;

  1070.                 x++;

  1071.                 for (ch = 0; ch < s->nb_display_channels; ch++)

  1072.                     memset(s->magnitudes[ch], 0, h * sizeof(float));

  1073.             }

  1074.         }

  1075. 

  1076.         av_frame_free(&fin);

  1077.         s->outpicref->pts = 0;

  1078. 

  1079.         if (s->legend) {

  1080.             int multi = (s->mode == SEPARATE && s->color_mode == CHANNEL);

  1081.             float spp = samples / (float)sz;

  1082.             uint8_t *dst;

  1083. 

  1084.             drawtext(s->outpicref, 2, outlink->h - 10, "CREATED BY LIBAVFILTER", 0);

  1085. 

  1086.             dst = s->outpicref->data[0] + (s->start_y - 1) * s->outpicref->linesize[0] + s->start_x - 1;

  1087.             for (x = 0; x < s->w + 1; x++)

  1088.                 dst[x] = 200;

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

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

  1091.                 dst[x] = 200;

  1092.             for (y = 0; y < s->h + 2; y++) {

  1093.                 dst = s->outpicref->data[0] + (y + s->start_y - 1) * s->outpicref->linesize[0];

  1094.                 dst[s->start_x - 1] = 200;

  1095.                 dst[s->start_x + s->w] = 200;

  1096.             }

  1097.             if (s->orientation == VERTICAL) {

  1098.                 int h = s->mode == SEPARATE ? s->h / s->nb_display_channels : s->h;

  1099.                 for (ch = 0; ch < (s->mode == SEPARATE ? s->nb_display_channels : 1); ch++) {

  1100.                     for (y = 0; y < h; y += 20) {

  1101.                         dst = s->outpicref->data[0] + (s->start_y + h * (ch + 1) - y - 1) * s->outpicref->linesize[0];

  1102.                         dst[s->start_x - 2] = 200;

  1103.                         dst[s->start_x + s->w + 1] = 200;

  1104.                     }

  1105.                     for (y = 0; y < h; y += 40) {

  1106.                         dst = s->outpicref->data[0] + (s->start_y + h * (ch + 1) - y - 1) * s->outpicref->linesize[0];

  1107.                         dst[s->start_x - 3] = 200;

  1108.                         dst[s->start_x + s->w + 2] = 200;

  1109.                     }

  1110.                     dst = s->outpicref->data[0] + (s->start_y - 2) * s->outpicref->linesize[0] + s->start_x;

  1111.                     for (x = 0; x < s->w; x+=40)

  1112.                         dst[x] = 200;

  1113.                     dst = s->outpicref->data[0] + (s->start_y - 3) * s->outpicref->linesize[0] + s->start_x;

  1114.                     for (x = 0; x < s->w; x+=80)

  1115.                         dst[x] = 200;

  1116.                     dst = s->outpicref->data[0] + (s->h + s->start_y + 1) * s->outpicref->linesize[0] + s->start_x;

  1117.                     for (x = 0; x < s->w; x+=40) {

  1118.                         dst[x] = 200;

  1119.                     }

  1120.                     dst = s->outpicref->data[0] + (s->h + s->start_y + 2) * s->outpicref->linesize[0] + s->start_x;

  1121.                     for (x = 0; x < s->w; x+=80) {

  1122.                         dst[x] = 200;

  1123.                     }

  1124.                     for (y = 0; y < h; y += 40) {

  1125.                         float hertz = y * (inlink->sample_rate / 2) / (float)(1 << (int)ceil(log2(h)));

  1126.                         char *units;

  1127. 

  1128.                         if (hertz == 0)

  1129.                             units = av_asprintf("DC");

  1130.                         else

  1131.                             units = av_asprintf("%.2f", hertz);

  1132.                         if (!units)

  1133.                             return AVERROR(ENOMEM);

  1134. 

  1135.                         drawtext(s->outpicref, s->start_x - 8 * strlen(units) - 4, h * (ch + 1) + s->start_y - y - 4, units, 0);

  1136.                         av_free(units);

  1137.                     }

  1138.                 }

  1139. 

  1140.                 for (x = 0; x < s->w; x+=80) {

  1141.                     float seconds = x * spp / inlink->sample_rate;

  1142.                     char *units;

  1143. 

  1144.                     if (x == 0)

  1145.                         units = av_asprintf("0");

  1146.                     else if (log10(seconds) > 6)

  1147.                         units = av_asprintf("%.2fh", seconds / (60 * 60));

  1148.                     else if (log10(seconds) > 3)

  1149.                         units = av_asprintf("%.2fm", seconds / 60);

  1150.                     else

  1151.                         units = av_asprintf("%.2fs", seconds);

  1152.                     if (!units)

  1153.                         return AVERROR(ENOMEM);

  1154. 

  1155.                     drawtext(s->outpicref, s->start_x + x - 4 * strlen(units), s->h + s->start_y + 6, units, 0);

  1156.                     drawtext(s->outpicref, s->start_x + x - 4 * strlen(units), s->start_y - 12, units, 0);

  1157.                     av_free(units);

  1158.                 }

  1159. 

  1160.                 drawtext(s->outpicref, outlink->w / 2 - 4 * 4, outlink->h - s->start_y / 2, "TIME", 0);

  1161.                 drawtext(s->outpicref, s->start_x / 7, outlink->h / 2 - 14 * 4, "FREQUENCY (Hz)", 1);

  1162.             } else {

  1163.                 int w = s->mode == SEPARATE ? s->w / s->nb_display_channels : s->w;

  1164.                 for (y = 0; y < s->h; y += 20) {

  1165.                     dst = s->outpicref->data[0] + (s->start_y + y) * s->outpicref->linesize[0];

  1166.                     dst[s->start_x - 2] = 200;

  1167.                     dst[s->start_x + s->w + 1] = 200;

  1168.                 }

  1169.                 for (y = 0; y < s->h; y += 40) {

  1170.                     dst = s->outpicref->data[0] + (s->start_y + y) * s->outpicref->linesize[0];

  1171.                     dst[s->start_x - 3] = 200;

  1172.                     dst[s->start_x + s->w + 2] = 200;

  1173.                 }

  1174.                 for (ch = 0; ch < (s->mode == SEPARATE ? s->nb_display_channels : 1); ch++) {

  1175.                     dst = s->outpicref->data[0] + (s->start_y - 2) * s->outpicref->linesize[0] + s->start_x + w * ch;

  1176.                     for (x = 0; x < w; x+=40)

  1177.                         dst[x] = 200;

  1178.                     dst = s->outpicref->data[0] + (s->start_y - 3) * s->outpicref->linesize[0] + s->start_x + w * ch;

  1179.                     for (x = 0; x < w; x+=80)

  1180.                         dst[x] = 200;

  1181.                     dst = s->outpicref->data[0] + (s->h + s->start_y + 1) * s->outpicref->linesize[0] + s->start_x + w * ch;

  1182.                     for (x = 0; x < w; x+=40) {

  1183.                         dst[x] = 200;

  1184.                     }

  1185.                     dst = s->outpicref->data[0] + (s->h + s->start_y + 2) * s->outpicref->linesize[0] + s->start_x + w * ch;

  1186.                     for (x = 0; x < w; x+=80) {

  1187.                         dst[x] = 200;

  1188.                     }

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

  1190.                         float hertz = x * (inlink->sample_rate / 2) / (float)(1 << (int)ceil(log2(w)));

  1191.                         char *units;

  1192. 

  1193.                         if (hertz == 0)

  1194.                             units = av_asprintf("DC");

  1195.                         else

  1196.                             units = av_asprintf("%.2f", hertz);

  1197.                         if (!units)

  1198.                             return AVERROR(ENOMEM);

  1199. 

  1200.                         drawtext(s->outpicref, s->start_x - 4 * strlen(units) + x + w * ch, s->start_y - 12, units, 0);

  1201.                         drawtext(s->outpicref, s->start_x - 4 * strlen(units) + x + w * ch, s->h + s->start_y + 6, units, 0);

  1202.                         av_free(units);

  1203.                     }

  1204.                 }

  1205.                 for (y = 0; y < s->h; y+=40) {

  1206.                     float seconds = y * spp / inlink->sample_rate;

  1207.                     char *units;

  1208. 

  1209.                     if (x == 0)

  1210.                         units = av_asprintf("0");

  1211.                     else if (log10(seconds) > 6)

  1212.                         units = av_asprintf("%.2fh", seconds / (60 * 60));

  1213.                     else if (log10(seconds) > 3)

  1214.                         units = av_asprintf("%.2fm", seconds / 60);

  1215.                     else

  1216.                         units = av_asprintf("%.2fs", seconds);

  1217.                     if (!units)

  1218.                         return AVERROR(ENOMEM);

  1219. 

  1220.                     drawtext(s->outpicref, s->start_x - 8 * strlen(units) - 4, s->start_y + y - 4, units, 0);

  1221.                     av_free(units);

  1222.                 }

  1223.                 drawtext(s->outpicref, s->start_x / 7, outlink->h / 2 - 4 * 4, "TIME", 1);

  1224.                 drawtext(s->outpicref, outlink->w / 2 - 14 * 4, outlink->h - s->start_y / 2, "FREQUENCY (Hz)", 0);

  1225.             }

  1226. 

  1227.             for (ch = 0; ch < (multi ? s->nb_display_channels : 1); ch++) {

  1228.                 int h = multi ? s->h / s->nb_display_channels : s->h;

  1229. 

  1230.                 for (y = 0; y < h; y++) {

  1231.                     float out[3] = { 0., 127.5, 127.5};

  1232.                     int chn;

  1233. 

  1234.                     for (chn = 0; chn < (s->mode == SEPARATE ? 1 : s->nb_display_channels); chn++) {

  1235.                         float yf, uf, vf;

  1236.                         int channel = (multi) ? s->nb_display_channels - ch - 1 : chn;

  1237.                         float lout[3];

  1238. 

  1239.                         color_range(s, channel, &yf, &uf, &vf);

  1240.                         pick_color(s, yf, uf, vf, y / (float)h, lout);

  1241.                         out[0] += lout[0];

  1242.                         out[1] += lout[1];

  1243.                         out[2] += lout[2];

  1244.                     }

  1245.                     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);

  1246.                     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);

  1247.                     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);

  1248.                 }

  1249. 

  1250.                 for (y = 0; ch == 0 && y < h; y += h / 10) {

  1251.                     float value = 120.0 * log10(1. - y / (float)h);

  1252.                     char *text;

  1253. 

  1254.                     if (value < -120)

  1255.                         break;

  1256.                     text = av_asprintf("%.0f dB", value);

  1257.                     if (!text)

  1258.                         continue;

  1259.                     drawtext(s->outpicref, s->w + s->start_x + 35, s->start_y + y - 5, text, 0);

  1260.                     av_free(text);

  1261.                 }

  1262.             }

  1263.         }

  1264. 

  1265.         ret = ff_filter_frame(outlink, s->outpicref);

  1266.         s->outpicref = NULL;

  1267.     }

  1268. 

  1269.     return ret;

  1270. }

  1271. 

  1272. static int showspectrumpic_filter_frame(AVFilterLink *inlink, AVFrame *insamples)

  1273. {

  1274.     AVFilterContext *ctx = inlink->dst;

  1275.     ShowSpectrumContext *s = ctx->priv;

  1276.     int ret;

  1277. 

  1278.     ret = av_audio_fifo_write(s->fifo, (void **)insamples->extended_data, insamples->nb_samples);

  1279.     av_frame_free(&insamples);

  1280.     return ret;

  1281. }

  1282. 

  1283. static const AVFilterPad showspectrumpic_inputs[] = {

  1284.     {

  1285.         .name         = "default",

  1286.         .type         = AVMEDIA_TYPE_AUDIO,

  1287.         .filter_frame = showspectrumpic_filter_frame,

  1288.     },

  1289.     { NULL }

  1290. };

  1291. 

  1292. static const AVFilterPad showspectrumpic_outputs[] = {

  1293.     {

  1294.         .name          = "default",

  1295.         .type          = AVMEDIA_TYPE_VIDEO,

  1296.         .config_props  = config_output,

  1297.         .request_frame = showspectrumpic_request_frame,

  1298.     },

  1299.     { NULL }

  1300. };

  1301. 

  1302. AVFilter ff_avf_showspectrumpic = {

  1303.     .name          = "showspectrumpic",

  1304.     .description   = NULL_IF_CONFIG_SMALL("Convert input audio to a spectrum video output single picture."),

  1305.     .uninit        = uninit,

  1306.     .query_formats = query_formats,

  1307.     .priv_size     = sizeof(ShowSpectrumContext),

  1308.     .inputs        = showspectrumpic_inputs,

  1309.     .outputs       = showspectrumpic_outputs,

  1310.     .priv_class    = &showspectrumpic_class,

  1311.     .flags         = AVFILTER_FLAG_SLICE_THREADS,

  1312. };

  1313. 

  1314. #endif // CONFIG_SHOWSPECTRUMPIC_FILTER