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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/channel_layout.h"

  35. #include "libavutil/opt.h"

  36. #include "audio.h"

  37. #include "video.h"

  38. #include "avfilter.h"

  39. #include "internal.h"

  40. #include "window_func.h"

  41. 

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

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

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

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

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

  47. 

  48. typedef struct {

  49.     const AVClass *class;

  50.     int w, h;

  51.     AVFrame *outpicref;

  52.     int nb_display_channels;

  53.     int orientation;

  54.     int channel_width;

  55.     int channel_height;

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

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

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

  59.     int scale;

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

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

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

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

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

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

  66.     float **magnitudes;

  67.     int win_func;

  68.     int win_size;

  69.     double win_scale;

  70.     float overlap;

  71.     float gain;

  72.     int skip_samples;

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

  74.     AVAudioFifo *fifo;

  75.     int64_t pts;

  76.     int single_pic;

  77. } ShowSpectrumContext;

  78. 

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

  80. #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

  81. 

  82. static const AVOption showspectrum_options[] = {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  105.         { "4thrt","4th root",    0, AV_OPT_TYPE_CONST, {.i64=FOURTHRT}, 0, 0, FLAGS, "scale" },

  106.         { "5thrt","5th root",    0, AV_OPT_TYPE_CONST, {.i64=FIFTHRT},  0, 0, FLAGS, "scale" },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  132.     { NULL }

  133. };

  134. 

  135. AVFILTER_DEFINE_CLASS(showspectrum);

  136. 

  137. static const struct ColorTable {

  138.     float a, y, u, v;

  139. } color_table[][8] = {

  140.     [INTENSITY] = {

  141.     {    0,                  0,                  0,                   0 },

  142.     { 0.13, .03587126228984074,  .1573300977624594, -.02548747583751842 },

  143.     { 0.30, .18572281794568020,  .1772436246393981,  .17475554840414750 },

  144.     { 0.60, .28184980583656130, -.1593064119945782,  .47132074554608920 },

  145.     { 0.73, .65830621175547810, -.3716070802232764,  .24352759331252930 },

  146.     { 0.78, .76318535758242900, -.4307467689263783,  .16866496622310430 },

  147.     { 0.91, .95336363636363640, -.2045454545454546,  .03313636363636363 },

  148.     {    1,                  1,                  0,                   0 }},

  149.     [RAINBOW] = {

  150.     {    0,                  0,                  0,                   0 },

  151.     { 0.13,            44/256.,     (189-128)/256.,      (138-128)/256. },

  152.     { 0.25,            29/256.,     (186-128)/256.,      (119-128)/256. },

  153.     { 0.38,           119/256.,     (194-128)/256.,       (53-128)/256. },

  154.     { 0.60,           111/256.,      (73-128)/256.,       (59-128)/256. },

  155.     { 0.73,           205/256.,      (19-128)/256.,      (149-128)/256. },

  156.     { 0.86,           135/256.,      (83-128)/256.,      (200-128)/256. },

  157.     {    1,            73/256.,      (95-128)/256.,      (225-128)/256. }},

  158.     [MORELAND] = {

  159.     {    0,            44/256.,     (181-128)/256.,      (112-128)/256. },

  160.     { 0.13,           126/256.,     (177-128)/256.,      (106-128)/256. },

  161.     { 0.25,           164/256.,     (163-128)/256.,      (109-128)/256. },

  162.     { 0.38,           200/256.,     (140-128)/256.,      (120-128)/256. },

  163.     { 0.60,           201/256.,     (117-128)/256.,      (141-128)/256. },

  164.     { 0.73,           177/256.,     (103-128)/256.,      (165-128)/256. },

  165.     { 0.86,           136/256.,     (100-128)/256.,      (183-128)/256. },

  166.     {    1,            68/256.,     (117-128)/256.,      (203-128)/256. }},

  167.     [NEBULAE] = {

  168.     {    0,            10/256.,     (134-128)/256.,      (132-128)/256. },

  169.     { 0.23,            21/256.,     (137-128)/256.,      (130-128)/256. },

  170.     { 0.45,            35/256.,     (134-128)/256.,      (134-128)/256. },

  171.     { 0.57,            51/256.,     (130-128)/256.,      (139-128)/256. },

  172.     { 0.67,           104/256.,     (116-128)/256.,      (162-128)/256. },

  173.     { 0.77,           120/256.,     (105-128)/256.,      (188-128)/256. },

  174.     { 0.87,           140/256.,     (105-128)/256.,      (188-128)/256. },

  175.     {    1,                  1,                  0,                   0 }},

  176.     [FIRE] = {

  177.     {    0,                  0,                  0,                   0 },

  178.     { 0.23,            44/256.,     (132-128)/256.,      (127-128)/256. },

  179.     { 0.45,            62/256.,     (116-128)/256.,      (140-128)/256. },

  180.     { 0.57,            75/256.,     (105-128)/256.,      (152-128)/256. },

  181.     { 0.67,            95/256.,      (91-128)/256.,      (166-128)/256. },

  182.     { 0.77,           126/256.,      (74-128)/256.,      (172-128)/256. },

  183.     { 0.87,           164/256.,      (73-128)/256.,      (162-128)/256. },

  184.     {    1,                  1,                  0,                   0 }},

  185.     [FIERY] = {

  186.     {    0,                  0,                  0,                   0 },

  187.     { 0.23,            36/256.,     (116-128)/256.,      (163-128)/256. },

  188.     { 0.45,            52/256.,     (102-128)/256.,      (200-128)/256. },

  189.     { 0.57,           116/256.,      (84-128)/256.,      (196-128)/256. },

  190.     { 0.67,           157/256.,      (67-128)/256.,      (181-128)/256. },

  191.     { 0.77,           193/256.,      (40-128)/256.,      (155-128)/256. },

  192.     { 0.87,           221/256.,     (101-128)/256.,      (134-128)/256. },

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

  194.     [FRUIT] = {

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

  196.     { 0.20,            29/256.,     (136-128)/256.,      (119-128)/256. },

  197.     { 0.30,            60/256.,     (119-128)/256.,       (90-128)/256. },

  198.     { 0.40,            85/256.,      (91-128)/256.,       (85-128)/256. },

  199.     { 0.50,           116/256.,      (70-128)/256.,      (105-128)/256. },

  200.     { 0.60,           151/256.,      (50-128)/256.,      (146-128)/256. },

  201.     { 0.70,           191/256.,      (63-128)/256.,      (178-128)/256. },

  202.     {    1,            98/256.,      (80-128)/256.,      (221-128)/256. }},

  203. };

  204. 

  205. static av_cold void uninit(AVFilterContext *ctx)

  206. {

  207.     ShowSpectrumContext *s = ctx->priv;

  208.     int i;

  209. 

  210.     av_freep(&s->combine_buffer);

  211.     av_fft_end(s->fft);

  212.     if (s->fft_data) {

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

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

  215.     }

  216.     av_freep(&s->fft_data);

  217.     av_freep(&s->window_func_lut);

  218.     if (s->magnitudes) {

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

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

  221.     }

  222.     av_freep(&s->magnitudes);

  223.     av_frame_free(&s->outpicref);

  224.     av_audio_fifo_free(s->fifo);

  225. }

  226. 

  227. static int query_formats(AVFilterContext *ctx)

  228. {

  229.     AVFilterFormats *formats = NULL;

  230.     AVFilterChannelLayouts *layouts = NULL;

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

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

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

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

  235.     int ret;

  236. 

  237.     /* set input audio formats */

  238.     formats = ff_make_format_list(sample_fmts);

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

  240.         return ret;

  241. 

  242.     layouts = ff_all_channel_layouts();

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

  244.         return ret;

  245. 

  246.     formats = ff_all_samplerates();

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

  248.         return ret;

  249. 

  250.     /* set output video format */

  251.     formats = ff_make_format_list(pix_fmts);

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

  253.         return ret;

  254. 

  255.     return 0;

  256. }

  257. 

  258. static int config_output(AVFilterLink *outlink)

  259. {

  260.     AVFilterContext *ctx = outlink->src;

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

  262.     ShowSpectrumContext *s = ctx->priv;

  263.     int i, fft_bits, h, w;

  264.     float overlap;

  265. 

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

  267.         s->single_pic = 1;

  268. 

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

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

  271. 

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

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

  274.     s->channel_height = h;

  275.     s->channel_width  = w;

  276. 

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

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

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

  280.     } else {

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

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

  283.     }

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

  285. 

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

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

  288.         AVFrame *outpicref;

  289. 

  290.         av_fft_end(s->fft);

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

  292.         if (!s->fft) {

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

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

  295.             return AVERROR(EINVAL);

  296.         }

  297.         s->fft_bits = fft_bits;

  298. 

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

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

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

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

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

  304.         av_freep(&s->fft_data);

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

  306. 

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

  308.         if (!s->magnitudes)

  309.             return AVERROR(ENOMEM);

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

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

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

  313.                 return AVERROR(ENOMEM);

  314.         }

  315. 

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

  317.         if (!s->fft_data)

  318.             return AVERROR(ENOMEM);

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

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

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

  322.                 return AVERROR(ENOMEM);

  323.         }

  324. 

  325.         /* pre-calc windowing function */

  326.         s->window_func_lut =

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

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

  329.         if (!s->window_func_lut)

  330.             return AVERROR(ENOMEM);

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

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

  333.             s->overlap = overlap;

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

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

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

  337.             return AVERROR(EINVAL);

  338.         }

  339. 

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

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

  342.         }

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

  344. 

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

  346.         av_frame_free(&s->outpicref);

  347.         s->outpicref = outpicref =

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

  349.         if (!outpicref)

  350.             return AVERROR(ENOMEM);

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

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

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

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

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

  356.         }

  357.     }

  358. 

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

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

  361.         s->xpos = 0;

  362. 

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

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

  365.         outlink->frame_rate.den *= outlink->w;

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

  367.         outlink->frame_rate.den *= outlink->h;

  368. 

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

  370.         s->combine_buffer =

  371.             av_realloc_f(s->combine_buffer, outlink->h * 3,

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

  373.     } else {

  374.         s->combine_buffer =

  375.             av_realloc_f(s->combine_buffer, outlink->w * 3,

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

  377.     }

  378. 

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

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

  381. 

  382.     av_audio_fifo_free(s->fifo);

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

  384.     if (!s->fifo)

  385.         return AVERROR(ENOMEM);

  386.     return 0;

  387. }

  388. 

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

  390. {

  391.     int ch, n;

  392. 

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

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

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

  396. 

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

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

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

  400.         }

  401.     }

  402. 

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

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

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

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

  407.     }

  408. }

  409. 

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

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

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

  413. 

  414. static void calc_magnitudes(ShowSpectrumContext *s)

  415. {

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

  417. 

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

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

  420. 

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

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

  423.     }

  424. }

  425. 

  426. static void acalc_magnitudes(ShowSpectrumContext *s)

  427. {

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

  429. 

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

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

  432. 

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

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

  435.     }

  436. }

  437. 

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

  439. {

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

  441. 

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

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

  444. 

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

  446.             magnitudes[y] *= scale;

  447.     }

  448. }

  449. 

  450. static void pick_color(ShowSpectrumContext *s,

  451.                        float yf, float uf, float vf,

  452.                        float a, float *out)

  453. {

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

  455.         const int cm = s->color_mode;

  456.         float y, u, v;

  457.         int i;

  458. 

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

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

  461.                 break;

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

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

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

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

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

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

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

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

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

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

  472.         } else {

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

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

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

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

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

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

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

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

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

  482.         }

  483. 

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

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

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

  487.     } else {

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

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

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

  491.     }

  492. }

  493. 

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

  495. {

  496.     int y;

  497. 

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

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

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

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

  502.     }

  503. }

  504. 

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

  506. {

  507.     int ret;

  508.     AVFilterContext *ctx = inlink->dst;

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

  510.     ShowSpectrumContext *s = ctx->priv;

  511.     AVFrame *outpicref = s->outpicref;

  512.     const double w = s->win_scale;

  513.     const float g = s->gain;

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

  515. 

  516.     int ch, plane, x, y;

  517. 

  518.     /* fill a new spectrum column */

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

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

  521. 

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

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

  524.         float yf, uf, vf;

  525. 

  526.         /* decide color range */

  527.         switch (s->mode) {

  528.         case COMBINED:

  529.             // reduce range by channel count

  530.             yf = 256.0f / s->nb_display_channels;

  531.             switch (s->color_mode) {

  532.             case RAINBOW:

  533.             case MORELAND:

  534.             case NEBULAE:

  535.             case FIRE:

  536.             case FIERY:

  537.             case FRUIT:

  538.             case INTENSITY:

  539.                 uf = yf;

  540.                 vf = yf;

  541.                 break;

  542.             case CHANNEL:

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

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

  545.                 uf = yf * M_PI;

  546.                 vf = yf * M_PI;

  547.                 break;

  548.             default:

  549.                 av_assert0(0);

  550.             }

  551.             break;

  552.         case SEPARATE:

  553.             // full range

  554.             yf = 256.0f;

  555.             uf = 256.0f;

  556.             vf = 256.0f;

  557.             break;

  558.         default:

  559.             av_assert0(0);

  560.         }

  561. 

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

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

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

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

  566.             } else {

  567.                 uf = 0.0f;

  568.                 vf = 0.0f;

  569.             }

  570.         }

  571.         uf *= s->saturation;

  572.         vf *= s->saturation;

  573. 

  574.         /* draw the channel */

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

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

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

  578. 

  579.             /* get magnitude */

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

  581. 

  582.             /* apply scale */

  583.             switch (s->scale) {

  584.             case LINEAR:

  585.                 break;

  586.             case SQRT:

  587.                 a = sqrt(a);

  588.                 break;

  589.             case CBRT:

  590.                 a = cbrt(a);

  591.                 break;

  592.             case FOURTHRT:

  593.                 a = pow(a, 0.25);

  594.                 break;

  595.             case FIFTHRT:

  596.                 a = pow(a, 0.20);

  597.                 break;

  598.             case LOG:

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

  600.                 break;

  601.             default:

  602.                 av_assert0(0);

  603.             }

  604. 

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

  606.         }

  607.     }

  608. 

  609.     av_frame_make_writable(s->outpicref);

  610.     /* copy to output */

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

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

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

  614.                 for (y = 0; y < outlink->h; y++) {

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

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

  617.                     memmove(p, p + 1, outlink->w - 1);

  618.                 }

  619.             }

  620.             s->xpos = outlink->w - 1;

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

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

  623.                 for (y = 0; y < outlink->h; y++) {

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

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

  626.                     memmove(p + 1, p, outlink->w - 1);

  627.                 }

  628.             }

  629.             s->xpos = 0;

  630.         }

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

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

  633.                          (outlink->h - 1) * outpicref->linesize[plane] +

  634.                          s->xpos;

  635.             for (y = 0; y < outlink->h; y++) {

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

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

  638.             }

  639.         }

  640.     } else {

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

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

  643.                 for (y = 1; y < outlink->h; y++) {

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

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

  646.                             outlink->w);

  647.                 }

  648.             }

  649.             s->xpos = outlink->h - 1;

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

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

  652.                 for (y = outlink->h - 1; y >= 1; y--) {

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

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

  655.                             outlink->w);

  656.                 }

  657.             }

  658.             s->xpos = 0;

  659.         }

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

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

  662.                          s->xpos * outpicref->linesize[plane];

  663.             for (x = 0; x < outlink->w; x++) {

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

  665.                 p++;

  666.             }

  667.         }

  668.     }

  669. 

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

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

  672. 

  673.     s->xpos++;

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

  675.         s->xpos = 0;

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

  677.         s->xpos = 0;

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

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

  680.         if (ret < 0)

  681.             return ret;

  682.     }

  683. 

  684.     return s->win_size;

  685. }

  686. 

  687. #if CONFIG_SHOWSPECTRUM_FILTER

  688. 

  689. static int request_frame(AVFilterLink *outlink)

  690. {

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

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

  693.     unsigned i;

  694.     int ret;

  695. 

  696.     ret = ff_request_frame(inlink);

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

  698.         s->outpicref) {

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

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

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

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

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

  704.             }

  705.         } else {

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

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

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

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

  710.             }

  711.         }

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

  713.         s->outpicref = NULL;

  714.     }

  715. 

  716.     return ret;

  717. }

  718. 

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

  720. {

  721.     AVFilterContext *ctx = inlink->dst;

  722.     ShowSpectrumContext *s = ctx->priv;

  723.     AVFrame *fin = NULL;

  724.     int ret = 0;

  725. 

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

  727.     av_frame_free(&insamples);

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

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

  730.         if (!fin) {

  731.             ret = AVERROR(ENOMEM);

  732.             goto fail;

  733.         }

  734. 

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

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

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

  738.         if (ret < 0)

  739.             goto fail;

  740. 

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

  742. 

  743.         run_fft(s, fin);

  744.         calc_magnitudes(s);

  745. 

  746.         ret = plot_spectrum_column(inlink, fin);

  747.         av_frame_free(&fin);

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

  749.         if (ret < 0)

  750.             goto fail;

  751.     }

  752. 

  753. fail:

  754.     av_frame_free(&fin);

  755.     return ret;

  756. }

  757. 

  758. static const AVFilterPad showspectrum_inputs[] = {

  759.     {

  760.         .name         = "default",

  761.         .type         = AVMEDIA_TYPE_AUDIO,

  762.         .filter_frame = filter_frame,

  763.     },

  764.     { NULL }

  765. };

  766. 

  767. static const AVFilterPad showspectrum_outputs[] = {

  768.     {

  769.         .name          = "default",

  770.         .type          = AVMEDIA_TYPE_VIDEO,

  771.         .config_props  = config_output,

  772.         .request_frame = request_frame,

  773.     },

  774.     { NULL }

  775. };

  776. 

  777. AVFilter ff_avf_showspectrum = {

  778.     .name          = "showspectrum",

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

  780.     .uninit        = uninit,

  781.     .query_formats = query_formats,

  782.     .priv_size     = sizeof(ShowSpectrumContext),

  783.     .inputs        = showspectrum_inputs,

  784.     .outputs       = showspectrum_outputs,

  785.     .priv_class    = &showspectrum_class,

  786. };

  787. #endif // CONFIG_SHOWSPECTRUM_FILTER

  788. 

  789. #if CONFIG_SHOWSPECTRUMPIC_FILTER

  790. 

  791. static const AVOption showspectrumpic_options[] = {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  809.         { "4thrt","4th root",    0, AV_OPT_TYPE_CONST, {.i64=FOURTHRT}, 0, 0, FLAGS, "scale" },

  810.         { "5thrt","5th root",    0, AV_OPT_TYPE_CONST, {.i64=FIFTHRT},  0, 0, FLAGS, "scale" },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  835.     { NULL }

  836. };

  837. 

  838. AVFILTER_DEFINE_CLASS(showspectrumpic);

  839. 

  840. static int showspectrumpic_request_frame(AVFilterLink *outlink)

  841. {

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

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

  844.     int ret;

  845. 

  846.     ret = ff_request_frame(inlink);

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

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

  849.         int consumed = 0;

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

  851.         int ch, spf, spb;

  852.         AVFrame *fin;

  853. 

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

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

  856. 

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

  858.         if (!fin)

  859.             return AVERROR(ENOMEM);

  860. 

  861.         while (x < sz) {

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

  863.             if (ret < 0) {

  864.                 av_frame_free(&fin);

  865.                 return ret;

  866.             }

  867. 

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

  869. 

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

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

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

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

  874.                 }

  875.             }

  876. 

  877.             run_fft(s, fin);

  878.             acalc_magnitudes(s);

  879. 

  880.             consumed += spf;

  881.             if (consumed >= spb) {

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

  883. 

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

  885.                 plot_spectrum_column(inlink, fin);

  886.                 consumed = 0;

  887.                 x++;

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

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

  890.             }

  891.         }

  892. 

  893.         av_frame_free(&fin);

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

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

  896.         s->outpicref = NULL;

  897.     }

  898. 

  899.     return ret;

  900. }

  901. 

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

  903. {

  904.     AVFilterContext *ctx = inlink->dst;

  905.     ShowSpectrumContext *s = ctx->priv;

  906.     int ret;

  907. 

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

  909.     av_frame_free(&insamples);

  910.     return ret;

  911. }

  912. 

  913. static const AVFilterPad showspectrumpic_inputs[] = {

  914.     {

  915.         .name         = "default",

  916.         .type         = AVMEDIA_TYPE_AUDIO,

  917.         .filter_frame = showspectrumpic_filter_frame,

  918.     },

  919.     { NULL }

  920. };

  921. 

  922. static const AVFilterPad showspectrumpic_outputs[] = {

  923.     {

  924.         .name          = "default",

  925.         .type          = AVMEDIA_TYPE_VIDEO,

  926.         .config_props  = config_output,

  927.         .request_frame = showspectrumpic_request_frame,

  928.     },

  929.     { NULL }

  930. };

  931. 

  932. AVFilter ff_avf_showspectrumpic = {

  933.     .name          = "showspectrumpic",

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

  935.     .uninit        = uninit,

  936.     .query_formats = query_formats,

  937.     .priv_size     = sizeof(ShowSpectrumContext),

  938.     .inputs        = showspectrumpic_inputs,

  939.     .outputs       = showspectrumpic_outputs,

  940.     .priv_class    = &showspectrumpic_class,

  941. };

  942. 

  943. #endif // CONFIG_SHOWSPECTRUMPIC_FILTER