falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
91973 Commits
32 Branches
1014MB
Tree: bd10c1e9a8
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from 'bd10c1e9a8'
${ noResults }
FFmpeg/libavfilter/avf_showspectrum.c

1341 lines
58KB
Raw Blame History 

  1. /*

  2.  * Copyright (c) 2012-2013 Clément Bœsch

  3.  * Copyright (c) 2013 Rudolf Polzer <divverent@xonotic.org>

  4.  * Copyright (c) 2015 Paul B Mahol

  5.  *

  6.  * This file is part of FFmpeg.

  7.  *

  8.  * FFmpeg is free software; you can redistribute it and/or

  9.  * modify it under the terms of the GNU Lesser General Public

  10.  * License as published by the Free Software Foundation; either

  11.  * version 2.1 of the License, or (at your option) any later version.

  12.  *

  13.  * FFmpeg is distributed in the hope that it will be useful,

  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  16.  * Lesser General Public License for more details.

  17.  *

  18.  * You should have received a copy of the GNU Lesser General Public

  19.  * License along with FFmpeg; if not, write to the Free Software

  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  21.  */

  22. 

  23. /**

  24.  * @file

  25.  * audio to spectrum (video) transmedia filter, based on ffplay rdft showmode

  26.  * (by Michael Niedermayer) and lavfi/avf_showwaves (by Stefano Sabatini).

  27.  */

  28. 

  29. #include <math.h>

  30. 

  31. #include "libavcodec/avfft.h"

  32. #include "libavutil/audio_fifo.h"

  33. #include "libavutil/avassert.h"

  34. #include "libavutil/avstring.h"

  35. #include "libavutil/channel_layout.h"

  36. #include "libavutil/opt.h"

  37. #include "libavutil/xga_font_data.h"

  38. #include "audio.h"

  39. #include "video.h"

  40. #include "avfilter.h"

  41. #include "internal.h"

  42. #include "window_func.h"

  43. 

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

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

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

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

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

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

  50. 

  51. typedef struct ShowSpectrumContext {

  52.     const AVClass *class;

  53.     int w, h;

  54.     AVFrame *outpicref;

  55.     int nb_display_channels;

  56.     int orientation;

  57.     int channel_width;

  58.     int channel_height;

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

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

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

  62.     int scale;

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

  64.     float rotation;             ///< color rotation

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

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

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

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

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

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

  118.         { "4thrt","4th root",    0, AV_OPT_TYPE_CONST, {.i64=FOURTHRT}, 0, 0, FLAGS, "scale" },

  119.         { "5thrt","5th root",    0, AV_OPT_TYPE_CONST, {.i64=FIFTHRT},  0, 0, FLAGS, "scale" },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  151.     { NULL }

  152. };

  153. 

  154. AVFILTER_DEFINE_CLASS(showspectrum);

  155. 

  156. static const struct ColorTable {

  157.     float a, y, u, v;

  158. } color_table[][8] = {

  159.     [INTENSITY] = {

  160.     {    0,                  0,                  0,                   0 },

  161.     { 0.13, .03587126228984074,  .1573300977624594, -.02548747583751842 },

  162.     { 0.30, .18572281794568020,  .1772436246393981,  .17475554840414750 },

  163.     { 0.60, .28184980583656130, -.1593064119945782,  .47132074554608920 },

  164.     { 0.73, .65830621175547810, -.3716070802232764,  .24352759331252930 },

  165.     { 0.78, .76318535758242900, -.4307467689263783,  .16866496622310430 },

  166.     { 0.91, .95336363636363640, -.2045454545454546,  .03313636363636363 },

  167.     {    1,                  1,                  0,                   0 }},

  168.     [RAINBOW] = {

  169.     {    0,                  0,                  0,                   0 },

  170.     { 0.13,            44/256.,     (189-128)/256.,      (138-128)/256. },

  171.     { 0.25,            29/256.,     (186-128)/256.,      (119-128)/256. },

  172.     { 0.38,           119/256.,     (194-128)/256.,       (53-128)/256. },

  173.     { 0.60,           111/256.,      (73-128)/256.,       (59-128)/256. },

  174.     { 0.73,           205/256.,      (19-128)/256.,      (149-128)/256. },

  175.     { 0.86,           135/256.,      (83-128)/256.,      (200-128)/256. },

  176.     {    1,            73/256.,      (95-128)/256.,      (225-128)/256. }},

  177.     [MORELAND] = {

  178.     {    0,            44/256.,     (181-128)/256.,      (112-128)/256. },

  179.     { 0.13,           126/256.,     (177-128)/256.,      (106-128)/256. },

  180.     { 0.25,           164/256.,     (163-128)/256.,      (109-128)/256. },

  181.     { 0.38,           200/256.,     (140-128)/256.,      (120-128)/256. },

  182.     { 0.60,           201/256.,     (117-128)/256.,      (141-128)/256. },

  183.     { 0.73,           177/256.,     (103-128)/256.,      (165-128)/256. },

  184.     { 0.86,           136/256.,     (100-128)/256.,      (183-128)/256. },

  185.     {    1,            68/256.,     (117-128)/256.,      (203-128)/256. }},

  186.     [NEBULAE] = {

  187.     {    0,            10/256.,     (134-128)/256.,      (132-128)/256. },

  188.     { 0.23,            21/256.,     (137-128)/256.,      (130-128)/256. },

  189.     { 0.45,            35/256.,     (134-128)/256.,      (134-128)/256. },

  190.     { 0.57,            51/256.,     (130-128)/256.,      (139-128)/256. },

  191.     { 0.67,           104/256.,     (116-128)/256.,      (162-128)/256. },

  192.     { 0.77,           120/256.,     (105-128)/256.,      (188-128)/256. },

  193.     { 0.87,           140/256.,     (105-128)/256.,      (188-128)/256. },

  194.     {    1,                  1,                  0,                   0 }},

  195.     [FIRE] = {

  196.     {    0,                  0,                  0,                   0 },

  197.     { 0.23,            44/256.,     (132-128)/256.,      (127-128)/256. },

  198.     { 0.45,            62/256.,     (116-128)/256.,      (140-128)/256. },

  199.     { 0.57,            75/256.,     (105-128)/256.,      (152-128)/256. },

  200.     { 0.67,            95/256.,      (91-128)/256.,      (166-128)/256. },

  201.     { 0.77,           126/256.,      (74-128)/256.,      (172-128)/256. },

  202.     { 0.87,           164/256.,      (73-128)/256.,      (162-128)/256. },

  203.     {    1,                  1,                  0,                   0 }},

  204.     [FIERY] = {

  205.     {    0,                  0,                  0,                   0 },

  206.     { 0.23,            36/256.,     (116-128)/256.,      (163-128)/256. },

  207.     { 0.45,            52/256.,     (102-128)/256.,      (200-128)/256. },

  208.     { 0.57,           116/256.,      (84-128)/256.,      (196-128)/256. },

  209.     { 0.67,           157/256.,      (67-128)/256.,      (181-128)/256. },

  210.     { 0.77,           193/256.,      (40-128)/256.,      (155-128)/256. },

  211.     { 0.87,           221/256.,     (101-128)/256.,      (134-128)/256. },

  212.     {    1,                  1,                  0,                   0 }},

  213.     [FRUIT] = {

  214.     {    0,                  0,                  0,                   0 },

  215.     { 0.20,            29/256.,     (136-128)/256.,      (119-128)/256. },

  216.     { 0.30,            60/256.,     (119-128)/256.,       (90-128)/256. },

  217.     { 0.40,            85/256.,      (91-128)/256.,       (85-128)/256. },

  218.     { 0.50,           116/256.,      (70-128)/256.,      (105-128)/256. },

  219.     { 0.60,           151/256.,      (50-128)/256.,      (146-128)/256. },

  220.     { 0.70,           191/256.,      (63-128)/256.,      (178-128)/256. },

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

  222.     [COOL] = {

  223.     {    0,                  0,                  0,                   0 },

  224.     {  .15,                  0,                 .5,                 -.5 },

  225.     {    1,                  1,                -.5,                  .5 }},

  226.     [MAGMA] = {

  227.     {    0,                  0,                  0,                   0 },

  228.     { 0.10,            23/256.,     (175-128)/256.,      (120-128)/256. },

  229.     { 0.23,            43/256.,     (158-128)/256.,      (144-128)/256. },

  230.     { 0.35,            85/256.,     (138-128)/256.,      (179-128)/256. },

  231.     { 0.48,            96/256.,     (128-128)/256.,      (189-128)/256. },

  232.     { 0.64,           128/256.,     (103-128)/256.,      (214-128)/256. },

  233.     { 0.78,           167/256.,      (85-128)/256.,      (174-128)/256. },

  234.     {    1,           205/256.,      (80-128)/256.,      (152-128)/256. }},

  235. };

  236. 

  237. static av_cold void uninit(AVFilterContext *ctx)

  238. {

  239.     ShowSpectrumContext *s = ctx->priv;

  240.     int i;

  241. 

  242.     av_freep(&s->combine_buffer);

  243.     if (s->fft) {

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

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

  246.     }

  247.     av_freep(&s->fft);

  248.     if (s->fft_data) {

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

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

  251.     }

  252.     av_freep(&s->fft_data);

  253.     if (s->color_buffer) {

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

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

  256.     }

  257.     av_freep(&s->color_buffer);

  258.     av_freep(&s->window_func_lut);

  259.     if (s->magnitudes) {

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

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

  262.     }

  263.     av_freep(&s->magnitudes);

  264.     av_frame_free(&s->outpicref);

  265.     av_audio_fifo_free(s->fifo);

  266.     if (s->phases) {

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

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

  269.     }

  270.     av_freep(&s->phases);

  271. }

  272. 

  273. static int query_formats(AVFilterContext *ctx)

  274. {

  275.     AVFilterFormats *formats = NULL;

  276.     AVFilterChannelLayouts *layouts = NULL;

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

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

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

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

  281.     int ret;

  282. 

  283.     /* set input audio formats */

  284.     formats = ff_make_format_list(sample_fmts);

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

  286.         return ret;

  287. 

  288.     layouts = ff_all_channel_layouts();

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

  290.         return ret;

  291. 

  292.     formats = ff_all_samplerates();

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

  294.         return ret;

  295. 

  296.     /* set output video format */

  297.     formats = ff_make_format_list(pix_fmts);

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

  299.         return ret;

  300. 

  301.     return 0;

  302. }

  303. 

  304. static int config_output(AVFilterLink *outlink)

  305. {

  306.     AVFilterContext *ctx = outlink->src;

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

  308.     ShowSpectrumContext *s = ctx->priv;

  309.     int i, fft_bits, h, w;

  310.     float overlap;

  311. 

  312.     s->pts = AV_NOPTS_VALUE;

  313. 

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

  315.         s->single_pic = 1;

  316. 

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

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

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

  320. 

  321.     if (s->legend) {

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

  323.         s->start_y = 64;

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

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

  326.     }

  327. 

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

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

  330.     s->channel_height = h;

  331.     s->channel_width  = w;

  332. 

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

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

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

  336.     } else {

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

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

  339.     }

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

  341. 

  342.     if (!s->fft) {

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

  344.         if (!s->fft)

  345.             return AVERROR(ENOMEM);

  346.     }

  347. 

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

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

  350.         AVFrame *outpicref;

  351. 

  352.         s->fft_bits = fft_bits;

  353. 

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

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

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

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

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

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

  360.         }

  361.         av_freep(&s->fft_data);

  362. 

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

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

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

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

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

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

  369.                 return AVERROR(EINVAL);

  370.             }

  371.         }

  372. 

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

  374.         if (!s->magnitudes)

  375.             return AVERROR(ENOMEM);

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

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

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

  379.                 return AVERROR(ENOMEM);

  380.         }

  381. 

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

  383.         if (!s->phases)

  384.             return AVERROR(ENOMEM);

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

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

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

  388.                 return AVERROR(ENOMEM);

  389.         }

  390. 

  391.         av_freep(&s->color_buffer);

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

  393.         if (!s->color_buffer)

  394.             return AVERROR(ENOMEM);

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

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

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

  398.                 return AVERROR(ENOMEM);

  399.         }

  400. 

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

  402.         if (!s->fft_data)

  403.             return AVERROR(ENOMEM);

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

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

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

  407.                 return AVERROR(ENOMEM);

  408.         }

  409. 

  410.         /* pre-calc windowing function */

  411.         s->window_func_lut =

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

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

  414.         if (!s->window_func_lut)

  415.             return AVERROR(ENOMEM);

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

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

  418.             s->overlap = overlap;

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

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

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

  422.             return AVERROR(EINVAL);

  423.         }

  424. 

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

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

  427.         }

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

  429. 

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

  431.         av_frame_free(&s->outpicref);

  432.         s->outpicref = outpicref =

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

  434.         if (!outpicref)

  435.             return AVERROR(ENOMEM);

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

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

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

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

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

  441.         }

  442.         outpicref->color_range = AVCOL_RANGE_JPEG;

  443.     }

  444. 

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

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

  447.         s->xpos = 0;

  448. 

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

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

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

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

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

  454. 

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

  456.         s->combine_buffer =

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

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

  459.     } else {

  460.         s->combine_buffer =

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

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

  463.     }

  464. 

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

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

  467. 

  468.     av_audio_fifo_free(s->fifo);

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

  470.     if (!s->fifo)

  471.         return AVERROR(ENOMEM);

  472.     return 0;

  473. }

  474. 

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

  476. {

  477.     ShowSpectrumContext *s = ctx->priv;

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

  479.     AVFrame *fin = arg;

  480.     const int ch = jobnr;

  481.     int n;

  482. 

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

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

  485. 

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

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

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

  489.     }

  490. 

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

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

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

  494. 

  495.     return 0;

  496. }

  497. 

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

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

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

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

  502. 

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

  504. {

  505.     ShowSpectrumContext *s = ctx->priv;

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

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

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

  509.     const int ch = jobnr;

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

  511. 

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

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

  514. 

  515.     return 0;

  516. }

  517. 

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

  519. {

  520.     ShowSpectrumContext *s = ctx->priv;

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

  522.     const int ch = jobnr;

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

  524.     int y;

  525. 

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

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

  528. 

  529.     return 0;

  530. }

  531. 

  532. static void acalc_magnitudes(ShowSpectrumContext *s)

  533. {

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

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

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

  537. 

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

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

  540. 

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

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

  543.     }

  544. }

  545. 

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

  547. {

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

  549. 

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

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

  552. 

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

  554.             magnitudes[y] *= scale;

  555.     }

  556. }

  557. 

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

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

  560. {

  561.     switch (s->mode) {

  562.     case COMBINED:

  563.         // reduce range by channel count

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

  565.         switch (s->color_mode) {

  566.         case RAINBOW:

  567.         case MORELAND:

  568.         case NEBULAE:

  569.         case FIRE:

  570.         case FIERY:

  571.         case FRUIT:

  572.         case COOL:

  573.         case MAGMA:

  574.         case INTENSITY:

  575.             *uf = *yf;

  576.             *vf = *yf;

  577.             break;

  578.         case CHANNEL:

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

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

  581.             *uf = *yf * M_PI;

  582.             *vf = *yf * M_PI;

  583.             break;

  584.         default:

  585.             av_assert0(0);

  586.         }

  587.         break;

  588.     case SEPARATE:

  589.         // full range

  590.         *yf = 256.0f;

  591.         *uf = 256.0f;

  592.         *vf = 256.0f;

  593.         break;

  594.     default:

  595.         av_assert0(0);

  596.     }

  597. 

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

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

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

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

  602.         } else {

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

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

  605.         }

  606.     } else {

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

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

  609.     }

  610. 

  611.     *uf *= s->saturation;

  612.     *vf *= s->saturation;

  613. }

  614. 

  615. static void pick_color(ShowSpectrumContext *s,

  616.                        float yf, float uf, float vf,

  617.                        float a, float *out)

  618. {

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

  620.         const int cm = s->color_mode;

  621.         float y, u, v;

  622.         int i;

  623. 

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

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

  626.                 break;

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

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

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

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

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

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

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

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

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

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

  637.         } else {

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

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

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

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

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

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

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

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

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

  647.         }

  648. 

  649.         out[0] = y * yf;

  650.         out[1] = u * uf;

  651.         out[2] = v * vf;

  652.     } else {

  653.         out[0] = a * yf;

  654.         out[1] = a * uf;

  655.         out[2] = a * vf;

  656.     }

  657. }

  658. 

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

  660. {

  661.     int y;

  662. 

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

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

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

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

  667.     }

  668. }

  669. 

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

  671. {

  672.     ShowSpectrumContext *s = ctx->priv;

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

  674.     const int ch = jobnr;

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

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

  677.     float yf, uf, vf;

  678.     int y;

  679. 

  680.     /* decide color range */

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

  682. 

  683.     /* draw the channel */

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

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

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

  687.         float a;

  688. 

  689.         switch (s->data) {

  690.         case D_MAGNITUDE:

  691.             /* get magnitude */

  692.             a = magnitudes[y];

  693.             break;

  694.         case D_PHASE:

  695.             /* get phase */

  696.             a = phases[y];

  697.             break;

  698.         default:

  699.             av_assert0(0);

  700.         }

  701. 

  702.         /* apply scale */

  703.         switch (s->scale) {

  704.         case LINEAR:

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

  706.             break;

  707.         case SQRT:

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

  709.             break;

  710.         case CBRT:

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

  712.             break;

  713.         case FOURTHRT:

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

  715.             break;

  716.         case FIFTHRT:

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

  718.             break;

  719.         case LOG:

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

  721.             break;

  722.         default:

  723.             av_assert0(0);

  724.         }

  725. 

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

  727.     }

  728. 

  729.     return 0;

  730. }

  731. 

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

  733. {

  734.     AVFilterContext *ctx = inlink->dst;

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

  736.     ShowSpectrumContext *s = ctx->priv;

  737.     AVFrame *outpicref = s->outpicref;

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

  739. 

  740.     /* fill a new spectrum column */

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

  742.     clear_combine_buffer(s, z);

  743. 

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

  745. 

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

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

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

  749.         }

  750.     }

  751. 

  752.     av_frame_make_writable(s->outpicref);

  753.     /* copy to output */

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

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

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

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

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

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

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

  761.                 }

  762.             }

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

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

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

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

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

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

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

  770.                 }

  771.             }

  772.             s->xpos = 0;

  773.         }

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

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

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

  777.                          s->xpos;

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

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

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

  781.             }

  782.         }

  783.     } else {

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

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

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

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

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

  789.                             s->w);

  790.                 }

  791.             }

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

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

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

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

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

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

  798.                             s->w);

  799.                 }

  800.             }

  801.             s->xpos = 0;

  802.         }

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

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

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

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

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

  808.                 p++;

  809.             }

  810.         }

  811.     }

  812. 

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

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

  815. 

  816.     s->xpos++;

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

  818.         s->xpos = 0;

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

  820.         s->xpos = 0;

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

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

  823.         if (ret < 0)

  824.             return ret;

  825.     }

  826. 

  827.     return s->win_size;

  828. }

  829. 

  830. #if CONFIG_SHOWSPECTRUM_FILTER

  831. 

  832. static int request_frame(AVFilterLink *outlink)

  833. {

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

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

  836.     unsigned i;

  837.     int ret;

  838. 

  839.     ret = ff_request_frame(inlink);

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

  841.         s->outpicref) {

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

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

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

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

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

  847.             }

  848.         } else {

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

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

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

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

  853.             }

  854.         }

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

  856.         s->outpicref = NULL;

  857.     }

  858. 

  859.     return ret;

  860. }

  861. 

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

  863. {

  864.     AVFilterContext *ctx = inlink->dst;

  865.     ShowSpectrumContext *s = ctx->priv;

  866.     AVFrame *fin = NULL;

  867.     int ret = 0, consumed = 0;

  868. 

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

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

  871. 

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

  873.     av_frame_free(&insamples);

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

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

  876.         if (!fin) {

  877.             ret = AVERROR(ENOMEM);

  878.             goto fail;

  879.         }

  880. 

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

  882.         consumed += s->hop_size;

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

  884.         if (ret < 0)

  885.             goto fail;

  886. 

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

  888. 

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

  890. 

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

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

  893. 

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

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

  896. 

  897.         ret = plot_spectrum_column(inlink, fin);

  898.         av_frame_free(&fin);

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

  900.         if (ret < 0)

  901.             goto fail;

  902.     }

  903. 

  904. fail:

  905.     s->pts = AV_NOPTS_VALUE;

  906.     av_frame_free(&fin);

  907.     return ret;

  908. }

  909. 

  910. static const AVFilterPad showspectrum_inputs[] = {

  911.     {

  912.         .name         = "default",

  913.         .type         = AVMEDIA_TYPE_AUDIO,

  914.         .filter_frame = filter_frame,

  915.     },

  916.     { NULL }

  917. };

  918. 

  919. static const AVFilterPad showspectrum_outputs[] = {

  920.     {

  921.         .name          = "default",

  922.         .type          = AVMEDIA_TYPE_VIDEO,

  923.         .config_props  = config_output,

  924.         .request_frame = request_frame,

  925.     },

  926.     { NULL }

  927. };

  928. 

  929. AVFilter ff_avf_showspectrum = {

  930.     .name          = "showspectrum",

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

  932.     .uninit        = uninit,

  933.     .query_formats = query_formats,

  934.     .priv_size     = sizeof(ShowSpectrumContext),

  935.     .inputs        = showspectrum_inputs,

  936.     .outputs       = showspectrum_outputs,

  937.     .priv_class    = &showspectrum_class,

  938.     .flags         = AVFILTER_FLAG_SLICE_THREADS,

  939. };

  940. #endif // CONFIG_SHOWSPECTRUM_FILTER

  941. 

  942. #if CONFIG_SHOWSPECTRUMPIC_FILTER

  943. 

  944. static const AVOption showspectrumpic_options[] = {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  966.         { "4thrt","4th root",    0, AV_OPT_TYPE_CONST, {.i64=FOURTHRT}, 0, 0, FLAGS, "scale" },

  967.         { "5thrt","5th root",    0, AV_OPT_TYPE_CONST, {.i64=FIFTHRT},  0, 0, FLAGS, "scale" },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  996.     { NULL }

  997. };

  998. 

  999. AVFILTER_DEFINE_CLASS(showspectrumpic);

  1000. 

  1001. static void drawtext(AVFrame *pic, int x, int y, const char *txt, int o)

  1002. {

  1003.     const uint8_t *font;

  1004.     int font_height;

  1005.     int i;

  1006. 

  1007.     font = avpriv_cga_font,   font_height =  8;

  1008. 

  1009.     for (i = 0; txt[i]; i++) {

  1010.         int char_y, mask;

  1011. 

  1012.         if (o) {

  1013.             for (char_y = font_height - 1; char_y >= 0; char_y--) {

  1014.                 uint8_t *p = pic->data[0] + (y + i * 10) * pic->linesize[0] + x;

  1015.                 for (mask = 0x80; mask; mask >>= 1) {

  1016.                     if (font[txt[i] * font_height + font_height - 1 - char_y] & mask)

  1017.                         p[char_y] = ~p[char_y];

  1018.                     p += pic->linesize[0];

  1019.                 }

  1020.             }

  1021.         } else {

  1022.             uint8_t *p = pic->data[0] + y*pic->linesize[0] + (x + i*8);

  1023.             for (char_y = 0; char_y < font_height; char_y++) {

  1024.                 for (mask = 0x80; mask; mask >>= 1) {

  1025.                     if (font[txt[i] * font_height + char_y] & mask)

  1026.                         *p = ~(*p);

  1027.                     p++;

  1028.                 }

  1029.                 p += pic->linesize[0] - 8;

  1030.             }

  1031.         }

  1032.     }

  1033. }

  1034. 

  1035. static int showspectrumpic_request_frame(AVFilterLink *outlink)

  1036. {

  1037.     AVFilterContext *ctx = outlink->src;

  1038.     ShowSpectrumContext *s = ctx->priv;

  1039.     AVFilterLink *inlink = ctx->inputs[0];

  1040.     int ret, samples;

  1041. 

  1042.     ret = ff_request_frame(inlink);

  1043.     samples = av_audio_fifo_size(s->fifo);

  1044.     if (ret == AVERROR_EOF && s->outpicref && samples > 0) {

  1045.         int consumed = 0;

  1046.         int y, x = 0, sz = s->orientation == VERTICAL ? s->w : s->h;

  1047.         int ch, spf, spb;

  1048.         AVFrame *fin;

  1049. 

  1050.         spf = s->win_size * (samples / ((s->win_size * sz) * ceil(samples / (float)(s->win_size * sz))));

  1051.         spf = FFMAX(1, spf);

  1052. 

  1053.         spb = (samples / (spf * sz)) * spf;

  1054. 

  1055.         fin = ff_get_audio_buffer(inlink, s->win_size);

  1056.         if (!fin)

  1057.             return AVERROR(ENOMEM);

  1058. 

  1059.         while (x < sz) {

  1060.             ret = av_audio_fifo_peek(s->fifo, (void **)fin->extended_data, s->win_size);

  1061.             if (ret < 0) {

  1062.                 av_frame_free(&fin);

  1063.                 return ret;

  1064.             }

  1065. 

  1066.             av_audio_fifo_drain(s->fifo, spf);

  1067. 

  1068.             if (ret < s->win_size) {

  1069.                 for (ch = 0; ch < s->nb_display_channels; ch++) {

  1070.                     memset(fin->extended_data[ch] + ret * sizeof(float), 0,

  1071.                            (s->win_size - ret) * sizeof(float));

  1072.                 }

  1073.             }

  1074. 

  1075.             ctx->internal->execute(ctx, run_channel_fft, fin, NULL, s->nb_display_channels);

  1076.             acalc_magnitudes(s);

  1077. 

  1078.             consumed += spf;

  1079.             if (consumed >= spb) {

  1080.                 int h = s->orientation == VERTICAL ? s->h : s->w;

  1081. 

  1082.                 scale_magnitudes(s, 1. / (consumed / spf));

  1083.                 plot_spectrum_column(inlink, fin);

  1084.                 consumed = 0;

  1085.                 x++;

  1086.                 for (ch = 0; ch < s->nb_display_channels; ch++)

  1087.                     memset(s->magnitudes[ch], 0, h * sizeof(float));

  1088.             }

  1089.         }

  1090. 

  1091.         av_frame_free(&fin);

  1092.         s->outpicref->pts = 0;

  1093. 

  1094.         if (s->legend) {

  1095.             int multi = (s->mode == SEPARATE && s->color_mode == CHANNEL);

  1096.             float spp = samples / (float)sz;

  1097.             char *text;

  1098.             uint8_t *dst;

  1099.             char chlayout_str[128];

  1100. 

  1101.             av_get_channel_layout_string(chlayout_str, sizeof(chlayout_str), inlink->channels,

  1102.                                          inlink->channel_layout);

  1103. 

  1104.             text = av_asprintf("%d Hz | %s", inlink->sample_rate, chlayout_str);

  1105. 

  1106.             drawtext(s->outpicref, 2, outlink->h - 10, "CREATED BY LIBAVFILTER", 0);

  1107.             drawtext(s->outpicref, outlink->w - 2 - strlen(text) * 10, outlink->h - 10, text, 0);

  1108. 

  1109.             av_freep(&text);

  1110. 

  1111.             dst = s->outpicref->data[0] + (s->start_y - 1) * s->outpicref->linesize[0] + s->start_x - 1;

  1112.             for (x = 0; x < s->w + 1; x++)

  1113.                 dst[x] = 200;

  1114.             dst = s->outpicref->data[0] + (s->start_y + s->h) * s->outpicref->linesize[0] + s->start_x - 1;

  1115.             for (x = 0; x < s->w + 1; x++)

  1116.                 dst[x] = 200;

  1117.             for (y = 0; y < s->h + 2; y++) {

  1118.                 dst = s->outpicref->data[0] + (y + s->start_y - 1) * s->outpicref->linesize[0];

  1119.                 dst[s->start_x - 1] = 200;

  1120.                 dst[s->start_x + s->w] = 200;

  1121.             }

  1122.             if (s->orientation == VERTICAL) {

  1123.                 int h = s->mode == SEPARATE ? s->h / s->nb_display_channels : s->h;

  1124.                 int hh = s->mode == SEPARATE ? -(s->h % s->nb_display_channels) + 1 : 1;

  1125.                 for (ch = 0; ch < (s->mode == SEPARATE ? s->nb_display_channels : 1); ch++) {

  1126.                     for (y = 0; y < h; y += 20) {

  1127.                         dst = s->outpicref->data[0] + (s->start_y + h * (ch + 1) - y - hh) * s->outpicref->linesize[0];

  1128.                         dst[s->start_x - 2] = 200;

  1129.                         dst[s->start_x + s->w + 1] = 200;

  1130.                     }

  1131.                     for (y = 0; y < h; y += 40) {

  1132.                         dst = s->outpicref->data[0] + (s->start_y + h * (ch + 1) - y - hh) * s->outpicref->linesize[0];

  1133.                         dst[s->start_x - 3] = 200;

  1134.                         dst[s->start_x + s->w + 2] = 200;

  1135.                     }

  1136.                     dst = s->outpicref->data[0] + (s->start_y - 2) * s->outpicref->linesize[0] + s->start_x;

  1137.                     for (x = 0; x < s->w; x+=40)

  1138.                         dst[x] = 200;

  1139.                     dst = s->outpicref->data[0] + (s->start_y - 3) * s->outpicref->linesize[0] + s->start_x;

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

  1141.                         dst[x] = 200;

  1142.                     dst = s->outpicref->data[0] + (s->h + s->start_y + 1) * s->outpicref->linesize[0] + s->start_x;

  1143.                     for (x = 0; x < s->w; x+=40) {

  1144.                         dst[x] = 200;

  1145.                     }

  1146.                     dst = s->outpicref->data[0] + (s->h + s->start_y + 2) * s->outpicref->linesize[0] + s->start_x;

  1147.                     for (x = 0; x < s->w; x+=80) {

  1148.                         dst[x] = 200;

  1149.                     }

  1150.                     for (y = 0; y < h; y += 40) {

  1151.                         float hertz = y * (inlink->sample_rate / 2) / (float)(1 << (int)ceil(log2(h)));

  1152.                         char *units;

  1153. 

  1154.                         if (hertz == 0)

  1155.                             units = av_asprintf("DC");

  1156.                         else

  1157.                             units = av_asprintf("%.2f", hertz);

  1158.                         if (!units)

  1159.                             return AVERROR(ENOMEM);

  1160. 

  1161.                         drawtext(s->outpicref, s->start_x - 8 * strlen(units) - 4, h * (ch + 1) + s->start_y - y - 4 - hh, units, 0);

  1162.                         av_free(units);

  1163.                     }

  1164.                 }

  1165. 

  1166.                 for (x = 0; x < s->w; x+=80) {

  1167.                     float seconds = x * spp / inlink->sample_rate;

  1168.                     char *units;

  1169. 

  1170.                     if (x == 0)

  1171.                         units = av_asprintf("0");

  1172.                     else if (log10(seconds) > 6)

  1173.                         units = av_asprintf("%.2fh", seconds / (60 * 60));

  1174.                     else if (log10(seconds) > 3)

  1175.                         units = av_asprintf("%.2fm", seconds / 60);

  1176.                     else

  1177.                         units = av_asprintf("%.2fs", seconds);

  1178.                     if (!units)

  1179.                         return AVERROR(ENOMEM);

  1180. 

  1181.                     drawtext(s->outpicref, s->start_x + x - 4 * strlen(units), s->h + s->start_y + 6, units, 0);

  1182.                     drawtext(s->outpicref, s->start_x + x - 4 * strlen(units), s->start_y - 12, units, 0);

  1183.                     av_free(units);

  1184.                 }

  1185. 

  1186.                 drawtext(s->outpicref, outlink->w / 2 - 4 * 4, outlink->h - s->start_y / 2, "TIME", 0);

  1187.                 drawtext(s->outpicref, s->start_x / 7, outlink->h / 2 - 14 * 4, "FREQUENCY (Hz)", 1);

  1188.             } else {

  1189.                 int w = s->mode == SEPARATE ? s->w / s->nb_display_channels : s->w;

  1190.                 for (y = 0; y < s->h; y += 20) {

  1191.                     dst = s->outpicref->data[0] + (s->start_y + y) * s->outpicref->linesize[0];

  1192.                     dst[s->start_x - 2] = 200;

  1193.                     dst[s->start_x + s->w + 1] = 200;

  1194.                 }

  1195.                 for (y = 0; y < s->h; y += 40) {

  1196.                     dst = s->outpicref->data[0] + (s->start_y + y) * s->outpicref->linesize[0];

  1197.                     dst[s->start_x - 3] = 200;

  1198.                     dst[s->start_x + s->w + 2] = 200;

  1199.                 }

  1200.                 for (ch = 0; ch < (s->mode == SEPARATE ? s->nb_display_channels : 1); ch++) {

  1201.                     dst = s->outpicref->data[0] + (s->start_y - 2) * s->outpicref->linesize[0] + s->start_x + w * ch;

  1202.                     for (x = 0; x < w; x+=40)

  1203.                         dst[x] = 200;

  1204.                     dst = s->outpicref->data[0] + (s->start_y - 3) * s->outpicref->linesize[0] + s->start_x + w * ch;

  1205.                     for (x = 0; x < w; x+=80)

  1206.                         dst[x] = 200;

  1207.                     dst = s->outpicref->data[0] + (s->h + s->start_y + 1) * s->outpicref->linesize[0] + s->start_x + w * ch;

  1208.                     for (x = 0; x < w; x+=40) {

  1209.                         dst[x] = 200;

  1210.                     }

  1211.                     dst = s->outpicref->data[0] + (s->h + s->start_y + 2) * s->outpicref->linesize[0] + s->start_x + w * ch;

  1212.                     for (x = 0; x < w; x+=80) {

  1213.                         dst[x] = 200;

  1214.                     }

  1215.                     for (x = 0; x < w - 79; x += 80) {

  1216.                         float hertz = x * (inlink->sample_rate / 2) / (float)(1 << (int)ceil(log2(w)));

  1217.                         char *units;

  1218. 

  1219.                         if (hertz == 0)

  1220.                             units = av_asprintf("DC");

  1221.                         else

  1222.                             units = av_asprintf("%.2f", hertz);

  1223.                         if (!units)

  1224.                             return AVERROR(ENOMEM);

  1225. 

  1226.                         drawtext(s->outpicref, s->start_x - 4 * strlen(units) + x + w * ch, s->start_y - 12, units, 0);

  1227.                         drawtext(s->outpicref, s->start_x - 4 * strlen(units) + x + w * ch, s->h + s->start_y + 6, units, 0);

  1228.                         av_free(units);

  1229.                     }

  1230.                 }

  1231.                 for (y = 0; y < s->h; y+=40) {

  1232.                     float seconds = y * spp / inlink->sample_rate;

  1233.                     char *units;

  1234. 

  1235.                     if (x == 0)

  1236.                         units = av_asprintf("0");

  1237.                     else if (log10(seconds) > 6)

  1238.                         units = av_asprintf("%.2fh", seconds / (60 * 60));

  1239.                     else if (log10(seconds) > 3)

  1240.                         units = av_asprintf("%.2fm", seconds / 60);

  1241.                     else

  1242.                         units = av_asprintf("%.2fs", seconds);

  1243.                     if (!units)

  1244.                         return AVERROR(ENOMEM);

  1245. 

  1246.                     drawtext(s->outpicref, s->start_x - 8 * strlen(units) - 4, s->start_y + y - 4, units, 0);

  1247.                     av_free(units);

  1248.                 }

  1249.                 drawtext(s->outpicref, s->start_x / 7, outlink->h / 2 - 4 * 4, "TIME", 1);

  1250.                 drawtext(s->outpicref, outlink->w / 2 - 14 * 4, outlink->h - s->start_y / 2, "FREQUENCY (Hz)", 0);

  1251.             }

  1252. 

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

  1254.                 int h = multi ? s->h / s->nb_display_channels : s->h;

  1255. 

  1256.                 for (y = 0; y < h; y++) {

  1257.                     float out[3] = { 0., 127.5, 127.5};

  1258.                     int chn;

  1259. 

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

  1261.                         float yf, uf, vf;

  1262.                         int channel = (multi) ? s->nb_display_channels - ch - 1 : chn;

  1263.                         float lout[3];

  1264. 

  1265.                         color_range(s, channel, &yf, &uf, &vf);

  1266.                         pick_color(s, yf, uf, vf, y / (float)h, lout);

  1267.                         out[0] += lout[0];

  1268.                         out[1] += lout[1];

  1269.                         out[2] += lout[2];

  1270.                     }

  1271.                     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);

  1272.                     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);

  1273.                     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);

  1274.                 }

  1275. 

  1276.                 for (y = 0; ch == 0 && y < h; y += h / 10) {

  1277.                     float value = 120.0 * log10(1. - y / (float)h);

  1278.                     char *text;

  1279. 

  1280.                     if (value < -120)

  1281.                         break;

  1282.                     text = av_asprintf("%.0f dB", value);

  1283.                     if (!text)

  1284.                         continue;

  1285.                     drawtext(s->outpicref, s->w + s->start_x + 35, s->start_y + y - 5, text, 0);

  1286.                     av_free(text);

  1287.                 }

  1288.             }

  1289.         }

  1290. 

  1291.         ret = ff_filter_frame(outlink, s->outpicref);

  1292.         s->outpicref = NULL;

  1293.     }

  1294. 

  1295.     return ret;

  1296. }

  1297. 

  1298. static int showspectrumpic_filter_frame(AVFilterLink *inlink, AVFrame *insamples)

  1299. {

  1300.     AVFilterContext *ctx = inlink->dst;

  1301.     ShowSpectrumContext *s = ctx->priv;

  1302.     int ret;

  1303. 

  1304.     ret = av_audio_fifo_write(s->fifo, (void **)insamples->extended_data, insamples->nb_samples);

  1305.     av_frame_free(&insamples);

  1306.     return ret;

  1307. }

  1308. 

  1309. static const AVFilterPad showspectrumpic_inputs[] = {

  1310.     {

  1311.         .name         = "default",

  1312.         .type         = AVMEDIA_TYPE_AUDIO,

  1313.         .filter_frame = showspectrumpic_filter_frame,

  1314.     },

  1315.     { NULL }

  1316. };

  1317. 

  1318. static const AVFilterPad showspectrumpic_outputs[] = {

  1319.     {

  1320.         .name          = "default",

  1321.         .type          = AVMEDIA_TYPE_VIDEO,

  1322.         .config_props  = config_output,

  1323.         .request_frame = showspectrumpic_request_frame,

  1324.     },

  1325.     { NULL }

  1326. };

  1327. 

  1328. AVFilter ff_avf_showspectrumpic = {

  1329.     .name          = "showspectrumpic",

  1330.     .description   = NULL_IF_CONFIG_SMALL("Convert input audio to a spectrum video output single picture."),

  1331.     .uninit        = uninit,

  1332.     .query_formats = query_formats,

  1333.     .priv_size     = sizeof(ShowSpectrumContext),

  1334.     .inputs        = showspectrumpic_inputs,

  1335.     .outputs       = showspectrumpic_outputs,

  1336.     .priv_class    = &showspectrumpic_class,

  1337.     .flags         = AVFILTER_FLAG_SLICE_THREADS,

  1338. };

  1339. 

  1340. #endif // CONFIG_SHOWSPECTRUMPIC_FILTER