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FFmpeg/libavfilter/avf_showspectrum.c

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  1. /*

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

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

  4.  * Copyright (c) 2015 Paul B Mahol

  5.  *

  6.  * This file is part of FFmpeg.

  7.  *

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

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

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

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

  12.  *

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

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

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

  16.  * Lesser General Public License for more details.

  17.  *

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

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

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

  21.  */

  22. 

  23. /**

  24.  * @file

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

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

  27.  */

  28. 

  29. #include <math.h>

  30. 

  31. #include "libavcodec/avfft.h"

  32. #include "libavutil/audio_fifo.h"

  33. #include "libavutil/avassert.h"

  34. #include "libavutil/avstring.h"

  35. #include "libavutil/channel_layout.h"

  36. #include "libavutil/opt.h"

  37. #include "libavutil/xga_font_data.h"

  38. #include "audio.h"

  39. #include "video.h"

  40. #include "avfilter.h"

  41. #include "internal.h"

  42. #include "window_func.h"

  43. 

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

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

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

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

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

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

  50. 

  51. typedef struct {

  52.     const AVClass *class;

  53.     int w, h;

  54.     AVFrame *outpicref;

  55.     int nb_display_channels;

  56.     int orientation;

  57.     int channel_width;

  58.     int channel_height;

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

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

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

  62.     int scale;

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

  64.     int data;

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

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

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

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

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

  70.     float **magnitudes;

  71.     float **phases;

  72.     int win_func;

  73.     int win_size;

  74.     double win_scale;

  75.     float overlap;

  76.     float gain;

  77.     int hop_size;

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

  79.     AVAudioFifo *fifo;

  80.     int64_t pts;

  81.     int single_pic;

  82.     int legend;

  83.     int start_x, start_y;

  84. } ShowSpectrumContext;

  85. 

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

  87. #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

  88. 

  89. static const AVOption showspectrum_options[] = {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  113.         { "4thrt","4th root",    0, AV_OPT_TYPE_CONST, {.i64=FOURTHRT}, 0, 0, FLAGS, "scale" },

  114.         { "5thrt","5th root",    0, AV_OPT_TYPE_CONST, {.i64=FIFTHRT},  0, 0, FLAGS, "scale" },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  143.     { NULL }

  144. };

  145. 

  146. AVFILTER_DEFINE_CLASS(showspectrum);

  147. 

  148. static const struct ColorTable {

  149.     float a, y, u, v;

  150. } color_table[][8] = {

  151.     [INTENSITY] = {

  152.     {    0,                  0,                  0,                   0 },

  153.     { 0.13, .03587126228984074,  .1573300977624594, -.02548747583751842 },

  154.     { 0.30, .18572281794568020,  .1772436246393981,  .17475554840414750 },

  155.     { 0.60, .28184980583656130, -.1593064119945782,  .47132074554608920 },

  156.     { 0.73, .65830621175547810, -.3716070802232764,  .24352759331252930 },

  157.     { 0.78, .76318535758242900, -.4307467689263783,  .16866496622310430 },

  158.     { 0.91, .95336363636363640, -.2045454545454546,  .03313636363636363 },

  159.     {    1,                  1,                  0,                   0 }},

  160.     [RAINBOW] = {

  161.     {    0,                  0,                  0,                   0 },

  162.     { 0.13,            44/256.,     (189-128)/256.,      (138-128)/256. },

  163.     { 0.25,            29/256.,     (186-128)/256.,      (119-128)/256. },

  164.     { 0.38,           119/256.,     (194-128)/256.,       (53-128)/256. },

  165.     { 0.60,           111/256.,      (73-128)/256.,       (59-128)/256. },

  166.     { 0.73,           205/256.,      (19-128)/256.,      (149-128)/256. },

  167.     { 0.86,           135/256.,      (83-128)/256.,      (200-128)/256. },

  168.     {    1,            73/256.,      (95-128)/256.,      (225-128)/256. }},

  169.     [MORELAND] = {

  170.     {    0,            44/256.,     (181-128)/256.,      (112-128)/256. },

  171.     { 0.13,           126/256.,     (177-128)/256.,      (106-128)/256. },

  172.     { 0.25,           164/256.,     (163-128)/256.,      (109-128)/256. },

  173.     { 0.38,           200/256.,     (140-128)/256.,      (120-128)/256. },

  174.     { 0.60,           201/256.,     (117-128)/256.,      (141-128)/256. },

  175.     { 0.73,           177/256.,     (103-128)/256.,      (165-128)/256. },

  176.     { 0.86,           136/256.,     (100-128)/256.,      (183-128)/256. },

  177.     {    1,            68/256.,     (117-128)/256.,      (203-128)/256. }},

  178.     [NEBULAE] = {

  179.     {    0,            10/256.,     (134-128)/256.,      (132-128)/256. },

  180.     { 0.23,            21/256.,     (137-128)/256.,      (130-128)/256. },

  181.     { 0.45,            35/256.,     (134-128)/256.,      (134-128)/256. },

  182.     { 0.57,            51/256.,     (130-128)/256.,      (139-128)/256. },

  183.     { 0.67,           104/256.,     (116-128)/256.,      (162-128)/256. },

  184.     { 0.77,           120/256.,     (105-128)/256.,      (188-128)/256. },

  185.     { 0.87,           140/256.,     (105-128)/256.,      (188-128)/256. },

  186.     {    1,                  1,                  0,                   0 }},

  187.     [FIRE] = {

  188.     {    0,                  0,                  0,                   0 },

  189.     { 0.23,            44/256.,     (132-128)/256.,      (127-128)/256. },

  190.     { 0.45,            62/256.,     (116-128)/256.,      (140-128)/256. },

  191.     { 0.57,            75/256.,     (105-128)/256.,      (152-128)/256. },

  192.     { 0.67,            95/256.,      (91-128)/256.,      (166-128)/256. },

  193.     { 0.77,           126/256.,      (74-128)/256.,      (172-128)/256. },

  194.     { 0.87,           164/256.,      (73-128)/256.,      (162-128)/256. },

  195.     {    1,                  1,                  0,                   0 }},

  196.     [FIERY] = {

  197.     {    0,                  0,                  0,                   0 },

  198.     { 0.23,            36/256.,     (116-128)/256.,      (163-128)/256. },

  199.     { 0.45,            52/256.,     (102-128)/256.,      (200-128)/256. },

  200.     { 0.57,           116/256.,      (84-128)/256.,      (196-128)/256. },

  201.     { 0.67,           157/256.,      (67-128)/256.,      (181-128)/256. },

  202.     { 0.77,           193/256.,      (40-128)/256.,      (155-128)/256. },

  203.     { 0.87,           221/256.,     (101-128)/256.,      (134-128)/256. },

  204.     {    1,                  1,                  0,                   0 }},

  205.     [FRUIT] = {

  206.     {    0,                  0,                  0,                   0 },

  207.     { 0.20,            29/256.,     (136-128)/256.,      (119-128)/256. },

  208.     { 0.30,            60/256.,     (119-128)/256.,       (90-128)/256. },

  209.     { 0.40,            85/256.,      (91-128)/256.,       (85-128)/256. },

  210.     { 0.50,           116/256.,      (70-128)/256.,      (105-128)/256. },

  211.     { 0.60,           151/256.,      (50-128)/256.,      (146-128)/256. },

  212.     { 0.70,           191/256.,      (63-128)/256.,      (178-128)/256. },

  213.     {    1,            98/256.,      (80-128)/256.,      (221-128)/256. }},

  214.     [COOL] = {

  215.     {    0,                  0,                  0,                   0 },

  216.     {  .15,                  0,                 .5,                 -.5 },

  217.     {    1,                  1,                -.5,                  .5 }},

  218. };

  219. 

  220. static av_cold void uninit(AVFilterContext *ctx)

  221. {

  222.     ShowSpectrumContext *s = ctx->priv;

  223.     int i;

  224. 

  225.     av_freep(&s->combine_buffer);

  226.     av_fft_end(s->fft);

  227.     if (s->fft_data) {

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

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

  230.     }

  231.     av_freep(&s->fft_data);

  232.     av_freep(&s->window_func_lut);

  233.     if (s->magnitudes) {

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

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

  236.     }

  237.     av_freep(&s->magnitudes);

  238.     av_frame_free(&s->outpicref);

  239.     av_audio_fifo_free(s->fifo);

  240.     if (s->phases) {

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

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

  243.     }

  244.     av_freep(&s->phases);

  245. }

  246. 

  247. static int query_formats(AVFilterContext *ctx)

  248. {

  249.     AVFilterFormats *formats = NULL;

  250.     AVFilterChannelLayouts *layouts = NULL;

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

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

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

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

  255.     int ret;

  256. 

  257.     /* set input audio formats */

  258.     formats = ff_make_format_list(sample_fmts);

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

  260.         return ret;

  261. 

  262.     layouts = ff_all_channel_layouts();

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

  264.         return ret;

  265. 

  266.     formats = ff_all_samplerates();

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

  268.         return ret;

  269. 

  270.     /* set output video format */

  271.     formats = ff_make_format_list(pix_fmts);

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

  273.         return ret;

  274. 

  275.     return 0;

  276. }

  277. 

  278. static int config_output(AVFilterLink *outlink)

  279. {

  280.     AVFilterContext *ctx = outlink->src;

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

  282.     ShowSpectrumContext *s = ctx->priv;

  283.     int i, fft_bits, h, w;

  284.     float overlap;

  285. 

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

  287.         s->single_pic = 1;

  288. 

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

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

  291. 

  292.     if (s->legend) {

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

  294.         s->start_y = 64;

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

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

  297.     }

  298. 

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

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

  301.     s->channel_height = h;

  302.     s->channel_width  = w;

  303. 

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

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

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

  307.     } else {

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

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

  310.     }

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

  312. 

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

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

  315.         AVFrame *outpicref;

  316. 

  317.         av_fft_end(s->fft);

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

  319.         if (!s->fft) {

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

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

  322.             return AVERROR(EINVAL);

  323.         }

  324.         s->fft_bits = fft_bits;

  325. 

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

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

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

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

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

  331.         av_freep(&s->fft_data);

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

  333. 

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

  335.         if (!s->magnitudes)

  336.             return AVERROR(ENOMEM);

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

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

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

  340.                 return AVERROR(ENOMEM);

  341.         }

  342. 

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

  344.         if (!s->phases)

  345.             return AVERROR(ENOMEM);

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

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

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

  349.                 return AVERROR(ENOMEM);

  350.         }

  351. 

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

  353.         if (!s->fft_data)

  354.             return AVERROR(ENOMEM);

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

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

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

  358.                 return AVERROR(ENOMEM);

  359.         }

  360. 

  361.         /* pre-calc windowing function */

  362.         s->window_func_lut =

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

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

  365.         if (!s->window_func_lut)

  366.             return AVERROR(ENOMEM);

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

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

  369.             s->overlap = overlap;

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

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

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

  373.             return AVERROR(EINVAL);

  374.         }

  375. 

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

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

  378.         }

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

  380. 

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

  382.         av_frame_free(&s->outpicref);

  383.         s->outpicref = outpicref =

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

  385.         if (!outpicref)

  386.             return AVERROR(ENOMEM);

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

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

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

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

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

  392.         }

  393.         av_frame_set_color_range(outpicref, AVCOL_RANGE_JPEG);

  394.     }

  395. 

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

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

  398.         s->xpos = 0;

  399. 

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

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

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

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

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

  405. 

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

  407.         s->combine_buffer =

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

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

  410.     } else {

  411.         s->combine_buffer =

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

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

  414.     }

  415. 

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

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

  418. 

  419.     av_audio_fifo_free(s->fifo);

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

  421.     if (!s->fifo)

  422.         return AVERROR(ENOMEM);

  423.     return 0;

  424. }

  425. 

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

  427. {

  428.     int ch, n;

  429. 

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

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

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

  433. 

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

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

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

  437.         }

  438.     }

  439. 

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

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

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

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

  444.     }

  445. }

  446. 

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

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

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

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

  451. 

  452. static void calc_magnitudes(ShowSpectrumContext *s)

  453. {

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

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

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

  457. 

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

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

  460. 

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

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

  463.     }

  464. }

  465. 

  466. static void calc_phases(ShowSpectrumContext *s)

  467. {

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

  469. 

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

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

  472. 

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

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

  475.     }

  476. }

  477. 

  478. static void acalc_magnitudes(ShowSpectrumContext *s)

  479. {

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

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

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

  483. 

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

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

  486. 

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

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

  489.     }

  490. }

  491. 

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

  493. {

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

  495. 

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

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

  498. 

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

  500.             magnitudes[y] *= scale;

  501.     }

  502. }

  503. 

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

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

  506. {

  507.     switch (s->mode) {

  508.     case COMBINED:

  509.         // reduce range by channel count

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

  511.         switch (s->color_mode) {

  512.         case RAINBOW:

  513.         case MORELAND:

  514.         case NEBULAE:

  515.         case FIRE:

  516.         case FIERY:

  517.         case FRUIT:

  518.         case COOL:

  519.         case INTENSITY:

  520.             *uf = *yf;

  521.             *vf = *yf;

  522.             break;

  523.         case CHANNEL:

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

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

  526.             *uf = *yf * M_PI;

  527.             *vf = *yf * M_PI;

  528.             break;

  529.         default:

  530.             av_assert0(0);

  531.         }

  532.         break;

  533.     case SEPARATE:

  534.         // full range

  535.         *yf = 256.0f;

  536.         *uf = 256.0f;

  537.         *vf = 256.0f;

  538.         break;

  539.     default:

  540.         av_assert0(0);

  541.     }

  542. 

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

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

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

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

  547.         } else {

  548.             *uf = 0.0f;

  549.             *vf = 0.0f;

  550.         }

  551.     }

  552.     *uf *= s->saturation;

  553.     *vf *= s->saturation;

  554. }

  555. 

  556. static void pick_color(ShowSpectrumContext *s,

  557.                        float yf, float uf, float vf,

  558.                        float a, float *out)

  559. {

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

  561.         const int cm = s->color_mode;

  562.         float y, u, v;

  563.         int i;

  564. 

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

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

  567.                 break;

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

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

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

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

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

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

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

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

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

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

  578.         } else {

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

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

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

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

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

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

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

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

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

  588.         }

  589. 

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

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

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

  593.     } else {

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

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

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

  597.     }

  598. }

  599. 

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

  601. {

  602.     int y;

  603. 

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

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

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

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

  608.     }

  609. }

  610. 

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

  612. {

  613.     int ret;

  614.     AVFilterContext *ctx = inlink->dst;

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

  616.     ShowSpectrumContext *s = ctx->priv;

  617.     AVFrame *outpicref = s->outpicref;

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

  619. 

  620.     int ch, plane, x, y;

  621. 

  622.     /* fill a new spectrum column */

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

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

  625. 

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

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

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

  629.         float yf, uf, vf;

  630. 

  631.         /* decide color range */

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

  633. 

  634.         /* draw the channel */

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

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

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

  638.             float a;

  639. 

  640.             switch (s->data) {

  641.             case D_MAGNITUDE:

  642.                 /* get magnitude */

  643.                 a = magnitudes[y];

  644.                 break;

  645.             case D_PHASE:

  646.                 /* get phase */

  647.                 a = phases[y];

  648.                 break;

  649.             default:

  650.                 av_assert0(0);

  651.             }

  652. 

  653.             /* apply scale */

  654.             switch (s->scale) {

  655.             case LINEAR:

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

  657.                 break;

  658.             case SQRT:

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

  660.                 break;

  661.             case CBRT:

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

  663.                 break;

  664.             case FOURTHRT:

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

  666.                 break;

  667.             case FIFTHRT:

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

  669.                 break;

  670.             case LOG:

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

  672.                 break;

  673.             default:

  674.                 av_assert0(0);

  675.             }

  676. 

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

  678.         }

  679.     }

  680. 

  681.     av_frame_make_writable(s->outpicref);

  682.     /* copy to output */

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

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

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

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

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

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

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

  690.                 }

  691.             }

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

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

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

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

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

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

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

  699.                 }

  700.             }

  701.             s->xpos = 0;

  702.         }

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

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

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

  706.                          s->xpos;

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

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

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

  710.             }

  711.         }

  712.     } else {

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

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

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

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

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

  718.                             s->w);

  719.                 }

  720.             }

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

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

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

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

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

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

  727.                             s->w);

  728.                 }

  729.             }

  730.             s->xpos = 0;

  731.         }

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

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

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

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

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

  737.                 p++;

  738.             }

  739.         }

  740.     }

  741. 

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

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

  744. 

  745.     s->xpos++;

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

  747.         s->xpos = 0;

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

  749.         s->xpos = 0;

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

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

  752.         if (ret < 0)

  753.             return ret;

  754.     }

  755. 

  756.     return s->win_size;

  757. }

  758. 

  759. #if CONFIG_SHOWSPECTRUM_FILTER

  760. 

  761. static int request_frame(AVFilterLink *outlink)

  762. {

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

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

  765.     unsigned i;

  766.     int ret;

  767. 

  768.     ret = ff_request_frame(inlink);

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

  770.         s->outpicref) {

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

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

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

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

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

  776.             }

  777.         } else {

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

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

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

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

  782.             }

  783.         }

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

  785.         s->outpicref = NULL;

  786.     }

  787. 

  788.     return ret;

  789. }

  790. 

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

  792. {

  793.     AVFilterContext *ctx = inlink->dst;

  794.     ShowSpectrumContext *s = ctx->priv;

  795.     AVFrame *fin = NULL;

  796.     int ret = 0, consumed = 0;

  797. 

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

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

  800. 

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

  802.     av_frame_free(&insamples);

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

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

  805.         if (!fin) {

  806.             ret = AVERROR(ENOMEM);

  807.             goto fail;

  808.         }

  809. 

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

  811.         consumed += s->hop_size;

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

  813.         if (ret < 0)

  814.             goto fail;

  815. 

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

  817. 

  818.         run_fft(s, fin);

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

  820.             calc_magnitudes(s);

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

  822.             calc_phases(s);

  823. 

  824.         ret = plot_spectrum_column(inlink, fin);

  825.         av_frame_free(&fin);

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

  827.         if (ret < 0)

  828.             goto fail;

  829.     }

  830. 

  831. fail:

  832.     s->pts = AV_NOPTS_VALUE;

  833.     av_frame_free(&fin);

  834.     return ret;

  835. }

  836. 

  837. static const AVFilterPad showspectrum_inputs[] = {

  838.     {

  839.         .name         = "default",

  840.         .type         = AVMEDIA_TYPE_AUDIO,

  841.         .filter_frame = filter_frame,

  842.     },

  843.     { NULL }

  844. };

  845. 

  846. static const AVFilterPad showspectrum_outputs[] = {

  847.     {

  848.         .name          = "default",

  849.         .type          = AVMEDIA_TYPE_VIDEO,

  850.         .config_props  = config_output,

  851.         .request_frame = request_frame,

  852.     },

  853.     { NULL }

  854. };

  855. 

  856. AVFilter ff_avf_showspectrum = {

  857.     .name          = "showspectrum",

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

  859.     .uninit        = uninit,

  860.     .query_formats = query_formats,

  861.     .priv_size     = sizeof(ShowSpectrumContext),

  862.     .inputs        = showspectrum_inputs,

  863.     .outputs       = showspectrum_outputs,

  864.     .priv_class    = &showspectrum_class,

  865. };

  866. #endif // CONFIG_SHOWSPECTRUM_FILTER

  867. 

  868. #if CONFIG_SHOWSPECTRUMPIC_FILTER

  869. 

  870. static const AVOption showspectrumpic_options[] = {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  889.         { "4thrt","4th root",    0, AV_OPT_TYPE_CONST, {.i64=FOURTHRT}, 0, 0, FLAGS, "scale" },

  890.         { "5thrt","5th root",    0, AV_OPT_TYPE_CONST, {.i64=FIFTHRT},  0, 0, FLAGS, "scale" },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  916.     { NULL }

  917. };

  918. 

  919. AVFILTER_DEFINE_CLASS(showspectrumpic);

  920. 

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

  922. {

  923.     const uint8_t *font;

  924.     int font_height;

  925.     int i;

  926. 

  927.     font = avpriv_cga_font,   font_height =  8;

  928. 

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

  930.         int char_y, mask;

  931. 

  932.         if (o) {

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

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

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

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

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

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

  939.                 }

  940.             }

  941.         } else {

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

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

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

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

  946.                         *p = ~(*p);

  947.                     p++;

  948.                 }

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

  950.             }

  951.         }

  952.     }

  953. }

  954. 

  955. static int showspectrumpic_request_frame(AVFilterLink *outlink)

  956. {

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

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

  959.     int ret;

  960. 

  961.     ret = ff_request_frame(inlink);

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

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

  964.         int consumed = 0;

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

  966.         int ch, spf, spb;

  967.         AVFrame *fin;

  968. 

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

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

  971. 

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

  973.         if (!fin)

  974.             return AVERROR(ENOMEM);

  975. 

  976.         while (x < sz) {

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

  978.             if (ret < 0) {

  979.                 av_frame_free(&fin);

  980.                 return ret;

  981.             }

  982. 

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

  984. 

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

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

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

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

  989.                 }

  990.             }

  991. 

  992.             run_fft(s, fin);

  993.             acalc_magnitudes(s);

  994. 

  995.             consumed += spf;

  996.             if (consumed >= spb) {

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

  998. 

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

  1000.                 plot_spectrum_column(inlink, fin);

  1001.                 consumed = 0;

  1002.                 x++;

  1003.                 for (ch = 0; ch < s->nb_display_channels; ch++)

  1004.                     memset(s->magnitudes[ch], 0, h * sizeof(float));

  1005.             }

  1006.         }

  1007. 

  1008.         av_frame_free(&fin);

  1009.         s->outpicref->pts = 0;

  1010. 

  1011.         if (s->legend) {

  1012.             int multi = (s->mode == SEPARATE && s->color_mode == CHANNEL);

  1013.             float spp = samples / (float)sz;

  1014.             uint8_t *dst;

  1015. 

  1016.             drawtext(s->outpicref, 2, outlink->h - 10, "CREATED BY LIBAVFILTER", 0);

  1017. 

  1018.             dst = s->outpicref->data[0] + (s->start_y - 1) * s->outpicref->linesize[0] + s->start_x - 1;

  1019.             for (x = 0; x < s->w + 1; x++)

  1020.                 dst[x] = 200;

  1021.             dst = s->outpicref->data[0] + (s->start_y + s->h) * s->outpicref->linesize[0] + s->start_x - 1;

  1022.             for (x = 0; x < s->w + 1; x++)

  1023.                 dst[x] = 200;

  1024.             for (y = 0; y < s->h + 2; y++) {

  1025.                 dst = s->outpicref->data[0] + (y + s->start_y - 1) * s->outpicref->linesize[0];

  1026.                 dst[s->start_x - 1] = 200;

  1027.                 dst[s->start_x + s->w] = 200;

  1028.             }

  1029.             if (s->orientation == VERTICAL) {

  1030.                 int h = s->mode == SEPARATE ? s->h / s->nb_display_channels : s->h;

  1031.                 for (ch = 0; ch < (s->mode == SEPARATE ? s->nb_display_channels : 1); ch++) {

  1032.                     for (y = 0; y < h; y += 20) {

  1033.                         dst = s->outpicref->data[0] + (s->start_y + h * (ch + 1) - y - 1) * s->outpicref->linesize[0];

  1034.                         dst[s->start_x - 2] = 200;

  1035.                         dst[s->start_x + s->w + 1] = 200;

  1036.                     }

  1037.                     for (y = 0; y < h; y += 40) {

  1038.                         dst = s->outpicref->data[0] + (s->start_y + h * (ch + 1) - y - 1) * s->outpicref->linesize[0];

  1039.                         dst[s->start_x - 3] = 200;

  1040.                         dst[s->start_x + s->w + 2] = 200;

  1041.                     }

  1042.                     dst = s->outpicref->data[0] + (s->start_y - 2) * s->outpicref->linesize[0] + s->start_x;

  1043.                     for (x = 0; x < s->w; x+=40)

  1044.                         dst[x] = 200;

  1045.                     dst = s->outpicref->data[0] + (s->start_y - 3) * s->outpicref->linesize[0] + s->start_x;

  1046.                     for (x = 0; x < s->w; x+=80)

  1047.                         dst[x] = 200;

  1048.                     dst = s->outpicref->data[0] + (s->h + s->start_y + 1) * s->outpicref->linesize[0] + s->start_x;

  1049.                     for (x = 0; x < s->w; x+=40) {

  1050.                         dst[x] = 200;

  1051.                     }

  1052.                     dst = s->outpicref->data[0] + (s->h + s->start_y + 2) * s->outpicref->linesize[0] + s->start_x;

  1053.                     for (x = 0; x < s->w; x+=80) {

  1054.                         dst[x] = 200;

  1055.                     }

  1056.                     for (y = 0; y < h; y += 40) {

  1057.                         float hz = y * (inlink->sample_rate / 2) / (float)(1 << (int)ceil(log2(h)));

  1058.                         char *units;

  1059. 

  1060.                         if (hz == 0)

  1061.                             units = av_asprintf("DC");

  1062.                         else

  1063.                             units = av_asprintf("%.2f", hz);

  1064.                         if (!units)

  1065.                             return AVERROR(ENOMEM);

  1066. 

  1067.                         drawtext(s->outpicref, s->start_x - 8 * strlen(units) - 4, h * (ch + 1) + s->start_y - y - 4, units, 0);

  1068.                         av_free(units);

  1069.                     }

  1070.                 }

  1071. 

  1072.                 for (x = 0; x < s->w; x+=80) {

  1073.                     float seconds = x * spp / inlink->sample_rate;

  1074.                     char *units;

  1075. 

  1076.                     if (x == 0)

  1077.                         units = av_asprintf("0");

  1078.                     else if (log10(seconds) > 6)

  1079.                         units = av_asprintf("%.2fh", seconds / (60 * 60));

  1080.                     else if (log10(seconds) > 3)

  1081.                         units = av_asprintf("%.2fm", seconds / 60);

  1082.                     else

  1083.                         units = av_asprintf("%.2fs", seconds);

  1084.                     if (!units)

  1085.                         return AVERROR(ENOMEM);

  1086. 

  1087.                     drawtext(s->outpicref, s->start_x + x - 4 * strlen(units), s->h + s->start_y + 6, units, 0);

  1088.                     drawtext(s->outpicref, s->start_x + x - 4 * strlen(units), s->start_y - 12, units, 0);

  1089.                     av_free(units);

  1090.                 }

  1091. 

  1092.                 drawtext(s->outpicref, outlink->w / 2 - 4 * 4, outlink->h - s->start_y / 2, "TIME", 0);

  1093.                 drawtext(s->outpicref, s->start_x / 7, outlink->h / 2 - 14 * 4, "FREQUENCY (Hz)", 1);

  1094.             } else {

  1095.                 int w = s->mode == SEPARATE ? s->w / s->nb_display_channels : s->w;

  1096.                 for (y = 0; y < s->h; y += 20) {

  1097.                     dst = s->outpicref->data[0] + (s->start_y + y) * s->outpicref->linesize[0];

  1098.                     dst[s->start_x - 2] = 200;

  1099.                     dst[s->start_x + s->w + 1] = 200;

  1100.                 }

  1101.                 for (y = 0; y < s->h; y += 40) {

  1102.                     dst = s->outpicref->data[0] + (s->start_y + y) * s->outpicref->linesize[0];

  1103.                     dst[s->start_x - 3] = 200;

  1104.                     dst[s->start_x + s->w + 2] = 200;

  1105.                 }

  1106.                 for (ch = 0; ch < (s->mode == SEPARATE ? s->nb_display_channels : 1); ch++) {

  1107.                     dst = s->outpicref->data[0] + (s->start_y - 2) * s->outpicref->linesize[0] + s->start_x + w * ch;

  1108.                     for (x = 0; x < w; x+=40)

  1109.                         dst[x] = 200;

  1110.                     dst = s->outpicref->data[0] + (s->start_y - 3) * s->outpicref->linesize[0] + s->start_x + w * ch;

  1111.                     for (x = 0; x < w; x+=80)

  1112.                         dst[x] = 200;

  1113.                     dst = s->outpicref->data[0] + (s->h + s->start_y + 1) * s->outpicref->linesize[0] + s->start_x + w * ch;

  1114.                     for (x = 0; x < w; x+=40) {

  1115.                         dst[x] = 200;

  1116.                     }

  1117.                     dst = s->outpicref->data[0] + (s->h + s->start_y + 2) * s->outpicref->linesize[0] + s->start_x + w * ch;

  1118.                     for (x = 0; x < w; x+=80) {

  1119.                         dst[x] = 200;

  1120.                     }

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

  1122.                         float hz = x * (inlink->sample_rate / 2) / (float)(1 << (int)ceil(log2(w)));

  1123.                         char *units;

  1124. 

  1125.                         if (hz == 0)

  1126.                             units = av_asprintf("DC");

  1127.                         else

  1128.                             units = av_asprintf("%.2f", hz);

  1129.                         if (!units)

  1130.                             return AVERROR(ENOMEM);

  1131. 

  1132.                         drawtext(s->outpicref, s->start_x - 4 * strlen(units) + x + w * ch, s->start_y - 12, units, 0);

  1133.                         drawtext(s->outpicref, s->start_x - 4 * strlen(units) + x + w * ch, s->h + s->start_y + 6, units, 0);

  1134.                         av_free(units);

  1135.                     }

  1136.                 }

  1137.                 for (y = 0; y < s->h; y+=40) {

  1138.                     float seconds = y * spp / inlink->sample_rate;

  1139.                     char *units;

  1140. 

  1141.                     if (x == 0)

  1142.                         units = av_asprintf("0");

  1143.                     else if (log10(seconds) > 6)

  1144.                         units = av_asprintf("%.2fh", seconds / (60 * 60));

  1145.                     else if (log10(seconds) > 3)

  1146.                         units = av_asprintf("%.2fm", seconds / 60);

  1147.                     else

  1148.                         units = av_asprintf("%.2fs", seconds);

  1149.                     if (!units)

  1150.                         return AVERROR(ENOMEM);

  1151. 

  1152.                     drawtext(s->outpicref, s->start_x - 8 * strlen(units) - 4, s->start_y + y - 4, units, 0);

  1153.                     av_free(units);

  1154.                 }

  1155.                 drawtext(s->outpicref, s->start_x / 7, outlink->h / 2 - 4 * 4, "TIME", 1);

  1156.                 drawtext(s->outpicref, outlink->w / 2 - 14 * 4, outlink->h - s->start_y / 2, "FREQUENCY (Hz)", 0);

  1157.             }

  1158. 

  1159.             for (ch = 0; ch < (multi ? s->nb_display_channels : 1); ch++) {

  1160.                 int h = multi ? s->h / s->nb_display_channels : s->h;

  1161. 

  1162.                 for (y = 0; y < h; y++) {

  1163.                     float out[3] = { 0., 127.5, 127.5};

  1164.                     int chn;

  1165. 

  1166.                     for (chn = 0; chn < (s->mode == SEPARATE ? 1 : s->nb_display_channels); chn++) {

  1167.                         float yf, uf, vf;

  1168.                         int channel = (multi) ? s->nb_display_channels - ch - 1 : chn;

  1169. 

  1170.                         color_range(s, channel, &yf, &uf, &vf);

  1171.                         pick_color(s, yf, uf, vf, y / (float)h, out);

  1172.                     }

  1173.                     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);

  1174.                     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);

  1175.                     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);

  1176.                 }

  1177.             }

  1178.         }

  1179. 

  1180.         ret = ff_filter_frame(outlink, s->outpicref);

  1181.         s->outpicref = NULL;

  1182.     }

  1183. 

  1184.     return ret;

  1185. }

  1186. 

  1187. static int showspectrumpic_filter_frame(AVFilterLink *inlink, AVFrame *insamples)

  1188. {

  1189.     AVFilterContext *ctx = inlink->dst;

  1190.     ShowSpectrumContext *s = ctx->priv;

  1191.     int ret;

  1192. 

  1193.     ret = av_audio_fifo_write(s->fifo, (void **)insamples->extended_data, insamples->nb_samples);

  1194.     av_frame_free(&insamples);

  1195.     return ret;

  1196. }

  1197. 

  1198. static const AVFilterPad showspectrumpic_inputs[] = {

  1199.     {

  1200.         .name         = "default",

  1201.         .type         = AVMEDIA_TYPE_AUDIO,

  1202.         .filter_frame = showspectrumpic_filter_frame,

  1203.     },

  1204.     { NULL }

  1205. };

  1206. 

  1207. static const AVFilterPad showspectrumpic_outputs[] = {

  1208.     {

  1209.         .name          = "default",

  1210.         .type          = AVMEDIA_TYPE_VIDEO,

  1211.         .config_props  = config_output,

  1212.         .request_frame = showspectrumpic_request_frame,

  1213.     },

  1214.     { NULL }

  1215. };

  1216. 

  1217. AVFilter ff_avf_showspectrumpic = {

  1218.     .name          = "showspectrumpic",

  1219.     .description   = NULL_IF_CONFIG_SMALL("Convert input audio to a spectrum video output single picture."),

  1220.     .uninit        = uninit,

  1221.     .query_formats = query_formats,

  1222.     .priv_size     = sizeof(ShowSpectrumContext),

  1223.     .inputs        = showspectrumpic_inputs,

  1224.     .outputs       = showspectrumpic_outputs,

  1225.     .priv_class    = &showspectrumpic_class,

  1226. };

  1227. 

  1228. #endif // CONFIG_SHOWSPECTRUMPIC_FILTER