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FFmpeg/libavfilter/avf_showfreqs.c

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  1. /*

  2.  * Copyright (c) 2015 Paul B Mahol

  3.  *

  4.  * This file is part of FFmpeg.

  5.  *

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

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

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

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

  10.  *

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

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

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

  14.  * Lesser General Public License for more details.

  15.  *

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

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

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

  19.  */

  20. 

  21. #include <float.h>

  22. #include <math.h>

  23. 

  24. #include "libavcodec/avfft.h"

  25. #include "libavutil/audio_fifo.h"

  26. #include "libavutil/avassert.h"

  27. #include "libavutil/avstring.h"

  28. #include "libavutil/channel_layout.h"

  29. #include "libavutil/intreadwrite.h"

  30. #include "libavutil/opt.h"

  31. #include "libavutil/parseutils.h"

  32. #include "audio.h"

  33. #include "filters.h"

  34. #include "video.h"

  35. #include "avfilter.h"

  36. #include "internal.h"

  37. #include "window_func.h"

  38. 

  39. enum DisplayMode    { LINE, BAR, DOT, NB_MODES };

  40. enum ChannelMode    { COMBINED, SEPARATE, NB_CMODES };

  41. enum FrequencyScale { FS_LINEAR, FS_LOG, FS_RLOG, NB_FSCALES };

  42. enum AmplitudeScale { AS_LINEAR, AS_SQRT, AS_CBRT, AS_LOG, NB_ASCALES };

  43. 

  44. typedef struct ShowFreqsContext {

  45.     const AVClass *class;

  46.     int w, h;

  47.     int mode;

  48.     int cmode;

  49.     int fft_bits;

  50.     int ascale, fscale;

  51.     int avg;

  52.     int win_func;

  53.     FFTContext *fft;

  54.     FFTComplex **fft_data;

  55.     float **avg_data;

  56.     float *window_func_lut;

  57.     float overlap;

  58.     float minamp;

  59.     int hop_size;

  60.     int nb_channels;

  61.     int nb_freq;

  62.     int win_size;

  63.     float scale;

  64.     char *colors;

  65.     AVAudioFifo *fifo;

  66.     int64_t pts;

  67. } ShowFreqsContext;

  68. 

  69. #define OFFSET(x) offsetof(ShowFreqsContext, x)

  70. #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

  71. 

  72. static const AVOption showfreqs_options[] = {

  73.     { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "1024x512"}, 0, 0, FLAGS },

  74.     { "s",    "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "1024x512"}, 0, 0, FLAGS },

  75.     { "mode", "set display mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=BAR}, 0, NB_MODES-1, FLAGS, "mode" },

  76.         { "line", "show lines",  0, AV_OPT_TYPE_CONST, {.i64=LINE},   0, 0, FLAGS, "mode" },

  77.         { "bar",  "show bars",   0, AV_OPT_TYPE_CONST, {.i64=BAR},    0, 0, FLAGS, "mode" },

  78.         { "dot",  "show dots",   0, AV_OPT_TYPE_CONST, {.i64=DOT},    0, 0, FLAGS, "mode" },

  79.     { "ascale", "set amplitude scale", OFFSET(ascale), AV_OPT_TYPE_INT, {.i64=AS_LOG}, 0, NB_ASCALES-1, FLAGS, "ascale" },

  80.         { "lin",  "linear",      0, AV_OPT_TYPE_CONST, {.i64=AS_LINEAR}, 0, 0, FLAGS, "ascale" },

  81.         { "sqrt", "square root", 0, AV_OPT_TYPE_CONST, {.i64=AS_SQRT},   0, 0, FLAGS, "ascale" },

  82.         { "cbrt", "cubic root",  0, AV_OPT_TYPE_CONST, {.i64=AS_CBRT},   0, 0, FLAGS, "ascale" },

  83.         { "log",  "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=AS_LOG},    0, 0, FLAGS, "ascale" },

  84.     { "fscale", "set frequency scale", OFFSET(fscale), AV_OPT_TYPE_INT, {.i64=FS_LINEAR}, 0, NB_FSCALES-1, FLAGS, "fscale" },

  85.         { "lin",  "linear",              0, AV_OPT_TYPE_CONST, {.i64=FS_LINEAR}, 0, 0, FLAGS, "fscale" },

  86.         { "log",  "logarithmic",         0, AV_OPT_TYPE_CONST, {.i64=FS_LOG},    0, 0, FLAGS, "fscale" },

  87.         { "rlog", "reverse logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=FS_RLOG},   0, 0, FLAGS, "fscale" },

  88.     { "win_size", "set window size", OFFSET(fft_bits), AV_OPT_TYPE_INT, {.i64=11}, 4, 16, FLAGS, "fft" },

  89.         { "w16",    0, 0, AV_OPT_TYPE_CONST, {.i64=4},  0, 0, FLAGS, "fft" },

  90.         { "w32",    0, 0, AV_OPT_TYPE_CONST, {.i64=5},  0, 0, FLAGS, "fft" },

  91.         { "w64",    0, 0, AV_OPT_TYPE_CONST, {.i64=6},  0, 0, FLAGS, "fft" },

  92.         { "w128",   0, 0, AV_OPT_TYPE_CONST, {.i64=7},  0, 0, FLAGS, "fft" },

  93.         { "w256",   0, 0, AV_OPT_TYPE_CONST, {.i64=8},  0, 0, FLAGS, "fft" },

  94.         { "w512",   0, 0, AV_OPT_TYPE_CONST, {.i64=9},  0, 0, FLAGS, "fft" },

  95.         { "w1024",  0, 0, AV_OPT_TYPE_CONST, {.i64=10}, 0, 0, FLAGS, "fft" },

  96.         { "w2048",  0, 0, AV_OPT_TYPE_CONST, {.i64=11}, 0, 0, FLAGS, "fft" },

  97.         { "w4096",  0, 0, AV_OPT_TYPE_CONST, {.i64=12}, 0, 0, FLAGS, "fft" },

  98.         { "w8192",  0, 0, AV_OPT_TYPE_CONST, {.i64=13}, 0, 0, FLAGS, "fft" },

  99.         { "w16384", 0, 0, AV_OPT_TYPE_CONST, {.i64=14}, 0, 0, FLAGS, "fft" },

  100.         { "w32768", 0, 0, AV_OPT_TYPE_CONST, {.i64=15}, 0, 0, FLAGS, "fft" },

  101.         { "w65536", 0, 0, AV_OPT_TYPE_CONST, {.i64=16}, 0, 0, FLAGS, "fft" },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  122.         { "bohman",   "Bohman",           0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BOHMAN} ,  0, 0, FLAGS, "win_func" },

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

  124.     { "averaging", "set time averaging", OFFSET(avg), AV_OPT_TYPE_INT, {.i64=1}, 0, INT32_MAX, FLAGS },

  125.     { "colors", "set channels colors", OFFSET(colors), AV_OPT_TYPE_STRING, {.str = "red|green|blue|yellow|orange|lime|pink|magenta|brown" }, 0, 0, FLAGS },

  126.     { "cmode", "set channel mode", OFFSET(cmode), AV_OPT_TYPE_INT, {.i64=COMBINED}, 0, NB_CMODES-1, FLAGS, "cmode" },

  127.         { "combined", "show all channels in same window",  0, AV_OPT_TYPE_CONST, {.i64=COMBINED}, 0, 0, FLAGS, "cmode" },

  128.         { "separate", "show each channel in own window",   0, AV_OPT_TYPE_CONST, {.i64=SEPARATE}, 0, 0, FLAGS, "cmode" },

  129.     { "minamp",  "set minimum amplitude", OFFSET(minamp), AV_OPT_TYPE_FLOAT, {.dbl=1e-6}, FLT_MIN, 1e-6, FLAGS },

  130.     { NULL }

  131. };

  132. 

  133. AVFILTER_DEFINE_CLASS(showfreqs);

  134. 

  135. static int query_formats(AVFilterContext *ctx)

  136. {

  137.     AVFilterFormats *formats = NULL;

  138.     AVFilterChannelLayouts *layouts = NULL;

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

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

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

  142.     static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_RGBA, AV_PIX_FMT_NONE };

  143.     int ret;

  144. 

  145.     /* set input audio formats */

  146.     formats = ff_make_format_list(sample_fmts);

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

  148.         return ret;

  149. 

  150.     layouts = ff_all_channel_layouts();

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

  152.         return ret;

  153. 

  154.     formats = ff_all_samplerates();

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

  156.         return ret;

  157. 

  158.     /* set output video format */

  159.     formats = ff_make_format_list(pix_fmts);

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

  161.         return ret;

  162. 

  163.     return 0;

  164. }

  165. 

  166. static av_cold int init(AVFilterContext *ctx)

  167. {

  168.     ShowFreqsContext *s = ctx->priv;

  169. 

  170.     s->pts = AV_NOPTS_VALUE;

  171. 

  172.     return 0;

  173. }

  174. 

  175. static int config_output(AVFilterLink *outlink)

  176. {

  177.     AVFilterContext *ctx = outlink->src;

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

  179.     ShowFreqsContext *s = ctx->priv;

  180.     float overlap;

  181.     int i;

  182. 

  183.     s->nb_freq = 1 << (s->fft_bits - 1);

  184.     s->win_size = s->nb_freq << 1;

  185.     av_audio_fifo_free(s->fifo);

  186.     av_fft_end(s->fft);

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

  188.     if (!s->fft) {

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

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

  191.         return AVERROR(ENOMEM);

  192.     }

  193. 

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

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

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

  197.     for (i = 0; i < s->nb_channels; i++) {

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

  199.         av_freep(&s->avg_data[i]);

  200.     }

  201.     av_freep(&s->fft_data);

  202.     av_freep(&s->avg_data);

  203.     s->nb_channels = inlink->channels;

  204. 

  205.     s->fft_data = av_calloc(s->nb_channels, sizeof(*s->fft_data));

  206.     if (!s->fft_data)

  207.         return AVERROR(ENOMEM);

  208.     s->avg_data = av_calloc(s->nb_channels, sizeof(*s->avg_data));

  209.     if (!s->fft_data)

  210.         return AVERROR(ENOMEM);

  211.     for (i = 0; i < s->nb_channels; i++) {

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

  213.         s->avg_data[i] = av_calloc(s->nb_freq, sizeof(**s->avg_data));

  214.         if (!s->fft_data[i] || !s->avg_data[i])

  215.             return AVERROR(ENOMEM);

  216.     }

  217. 

  218.     /* pre-calc windowing function */

  219.     s->window_func_lut = av_realloc_f(s->window_func_lut, s->win_size,

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

  221.     if (!s->window_func_lut)

  222.         return AVERROR(ENOMEM);

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

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

  225.         s->overlap = overlap;

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

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

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

  229.         return AVERROR(EINVAL);

  230.     }

  231. 

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

  233.         s->scale += s->window_func_lut[i] * s->window_func_lut[i];

  234.     }

  235. 

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

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

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

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

  240. 

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

  242.     if (!s->fifo)

  243.         return AVERROR(ENOMEM);

  244.     return 0;

  245. }

  246. 

  247. static inline void draw_dot(AVFrame *out, int x, int y, uint8_t fg[4])

  248. {

  249. 

  250.     uint32_t color = AV_RL32(out->data[0] + y * out->linesize[0] + x * 4);

  251. 

  252.     if ((color & 0xffffff) != 0)

  253.         AV_WL32(out->data[0] + y * out->linesize[0] + x * 4, AV_RL32(fg) | color);

  254.     else

  255.         AV_WL32(out->data[0] + y * out->linesize[0] + x * 4, AV_RL32(fg));

  256. }

  257. 

  258. static int get_sx(ShowFreqsContext *s, int f)

  259. {

  260.     switch (s->fscale) {

  261.     case FS_LINEAR:

  262.         return (s->w/(float)s->nb_freq)*f;

  263.     case FS_LOG:

  264.         return s->w-pow(s->w, (s->nb_freq-f-1)/(s->nb_freq-1.));

  265.     case FS_RLOG:

  266.         return pow(s->w, f/(s->nb_freq-1.));

  267.     }

  268. 

  269.     return 0;

  270. }

  271. 

  272. static float get_bsize(ShowFreqsContext *s, int f)

  273. {

  274.     switch (s->fscale) {

  275.     case FS_LINEAR:

  276.         return s->w/(float)s->nb_freq;

  277.     case FS_LOG:

  278.         return pow(s->w, (s->nb_freq-f-1)/(s->nb_freq-1.))-

  279.                pow(s->w, (s->nb_freq-f-2)/(s->nb_freq-1.));

  280.     case FS_RLOG:

  281.         return pow(s->w, (f+1)/(s->nb_freq-1.))-

  282.                pow(s->w,  f   /(s->nb_freq-1.));

  283.     }

  284. 

  285.     return 1.;

  286. }

  287. 

  288. static inline void plot_freq(ShowFreqsContext *s, int ch,

  289.                              double a, int f, uint8_t fg[4], int *prev_y,

  290.                              AVFrame *out, AVFilterLink *outlink)

  291. {

  292.     const int w = s->w;

  293.     const float min = s->minamp;

  294.     const float avg = s->avg_data[ch][f];

  295.     const float bsize = get_bsize(s, f);

  296.     const int sx = get_sx(s, f);

  297.     int end = outlink->h;

  298.     int x, y, i;

  299. 

  300.     switch(s->ascale) {

  301.     case AS_SQRT:

  302.         a = 1.0 - sqrt(a);

  303.         break;

  304.     case AS_CBRT:

  305.         a = 1.0 - cbrt(a);

  306.         break;

  307.     case AS_LOG:

  308.         a = log(av_clipd(a, min, 1)) / log(min);

  309.         break;

  310.     case AS_LINEAR:

  311.         a = 1.0 - a;

  312.         break;

  313.     }

  314. 

  315.     switch (s->cmode) {

  316.     case COMBINED:

  317.         y = a * outlink->h - 1;

  318.         break;

  319.     case SEPARATE:

  320.         end = (outlink->h / s->nb_channels) * (ch + 1);

  321.         y = (outlink->h / s->nb_channels) * ch + a * (outlink->h / s->nb_channels) - 1;

  322.         break;

  323.     default:

  324.         av_assert0(0);

  325.     }

  326.     if (y < 0)

  327.         return;

  328. 

  329.     switch (s->avg) {

  330.     case 0:

  331.         y = s->avg_data[ch][f] = !outlink->frame_count_in ? y : FFMIN(avg, y);

  332.         break;

  333.     case 1:

  334.         break;

  335.     default:

  336.         s->avg_data[ch][f] = avg + y * (y - avg) / (FFMIN(outlink->frame_count_in + 1, s->avg) * y);

  337.         y = s->avg_data[ch][f];

  338.         break;

  339.     }

  340. 

  341.     switch(s->mode) {

  342.     case LINE:

  343.         if (*prev_y == -1) {

  344.             *prev_y = y;

  345.         }

  346.         if (y <= *prev_y) {

  347.             for (x = sx + 1; x < sx + bsize && x < w; x++)

  348.                 draw_dot(out, x, y, fg);

  349.             for (i = y; i <= *prev_y; i++)

  350.                 draw_dot(out, sx, i, fg);

  351.         } else {

  352.             for (i = *prev_y; i <= y; i++)

  353.                 draw_dot(out, sx, i, fg);

  354.             for (x = sx + 1; x < sx + bsize && x < w; x++)

  355.                 draw_dot(out, x, i - 1, fg);

  356.         }

  357.         *prev_y = y;

  358.         break;

  359.     case BAR:

  360.         for (x = sx; x < sx + bsize && x < w; x++)

  361.             for (i = y; i < end; i++)

  362.                 draw_dot(out, x, i, fg);

  363.         break;

  364.     case DOT:

  365.         for (x = sx; x < sx + bsize && x < w; x++)

  366.             draw_dot(out, x, y, fg);

  367.         break;

  368.     }

  369. }

  370. 

  371. static int plot_freqs(AVFilterLink *inlink, AVFrame *in)

  372. {

  373.     AVFilterContext *ctx = inlink->dst;

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

  375.     ShowFreqsContext *s = ctx->priv;

  376.     const int win_size = s->win_size;

  377.     char *colors, *color, *saveptr = NULL;

  378.     AVFrame *out;

  379.     int ch, n;

  380. 

  381.     out = ff_get_video_buffer(outlink, outlink->w, outlink->h);

  382.     if (!out)

  383.         return AVERROR(ENOMEM);

  384. 

  385.     for (n = 0; n < outlink->h; n++)

  386.         memset(out->data[0] + out->linesize[0] * n, 0, outlink->w * 4);

  387. 

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

  389.     for (ch = 0; ch < s->nb_channels; ch++) {

  390.         const float *p = (float *)in->extended_data[ch];

  391. 

  392.         for (n = 0; n < in->nb_samples; n++) {

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

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

  395.         }

  396.         for (; n < win_size; n++) {

  397.             s->fft_data[ch][n].re = 0;

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

  399.         }

  400.     }

  401. 

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

  403.     for (ch = 0; ch < s->nb_channels; ch++) {

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

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

  406.     }

  407. 

  408. #define RE(x, ch) s->fft_data[ch][x].re

  409. #define IM(x, ch) s->fft_data[ch][x].im

  410. #define M(a, b) (sqrt((a) * (a) + (b) * (b)))

  411. 

  412.     colors = av_strdup(s->colors);

  413.     if (!colors) {

  414.         av_frame_free(&out);

  415.         return AVERROR(ENOMEM);

  416.     }

  417. 

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

  419.         uint8_t fg[4] = { 0xff, 0xff, 0xff, 0xff };

  420.         int prev_y = -1, f;

  421.         double a;

  422. 

  423.         color = av_strtok(ch == 0 ? colors : NULL, " |", &saveptr);

  424.         if (color)

  425.             av_parse_color(fg, color, -1, ctx);

  426. 

  427.         a = av_clipd(M(RE(0, ch), 0) / s->scale, 0, 1);

  428.         plot_freq(s, ch, a, 0, fg, &prev_y, out, outlink);

  429. 

  430.         for (f = 1; f < s->nb_freq; f++) {

  431.             a = av_clipd(M(RE(f, ch), IM(f, ch)) / s->scale, 0, 1);

  432. 

  433.             plot_freq(s, ch, a, f, fg, &prev_y, out, outlink);

  434.         }

  435.     }

  436. 

  437.     av_free(colors);

  438.     out->pts = in->pts;

  439.     out->sample_aspect_ratio = (AVRational){1,1};

  440.     return ff_filter_frame(outlink, out);

  441. }

  442. 

  443. static int filter_frame(AVFilterLink *inlink)

  444. {

  445.     AVFilterContext *ctx = inlink->dst;

  446.     ShowFreqsContext *s = ctx->priv;

  447.     AVFrame *fin = NULL;

  448.     int ret = 0;

  449. 

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

  451.     if (!fin) {

  452.         ret = AVERROR(ENOMEM);

  453.         goto fail;

  454.     }

  455. 

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

  457.     s->pts += s->hop_size;

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

  459.     if (ret < 0)

  460.         goto fail;

  461. 

  462.     ret = plot_freqs(inlink, fin);

  463.     av_frame_free(&fin);

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

  465. 

  466. fail:

  467.     av_frame_free(&fin);

  468.     return ret;

  469. }

  470. 

  471. static int activate(AVFilterContext *ctx)

  472. {

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

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

  475.     ShowFreqsContext *s = ctx->priv;

  476.     AVFrame *in = NULL;

  477.     int ret = 0;

  478. 

  479.     FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);

  480. 

  481.     if (av_audio_fifo_size(s->fifo) < s->win_size)

  482.         ret = ff_inlink_consume_samples(inlink, s->win_size, s->win_size, &in);

  483.     if (ret < 0)

  484.         return ret;

  485.     if (ret > 0) {

  486.         av_audio_fifo_write(s->fifo, (void **)in->extended_data, in->nb_samples);

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

  488.             s->pts = in->pts;

  489.     }

  490. 

  491.     if (av_audio_fifo_size(s->fifo) >= s->win_size) {

  492.         ret = filter_frame(inlink);

  493.         if (ret <= 0)

  494.             return ret;

  495.     }

  496. 

  497.     FF_FILTER_FORWARD_STATUS(inlink, outlink);

  498.     FF_FILTER_FORWARD_WANTED(outlink, inlink);

  499. 

  500.     return FFERROR_NOT_READY;

  501. }

  502. 

  503. static av_cold void uninit(AVFilterContext *ctx)

  504. {

  505.     ShowFreqsContext *s = ctx->priv;

  506.     int i;

  507. 

  508.     av_fft_end(s->fft);

  509.     for (i = 0; i < s->nb_channels; i++) {

  510.         if (s->fft_data)

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

  512.         if (s->avg_data)

  513.             av_freep(&s->avg_data[i]);

  514.     }

  515.     av_freep(&s->fft_data);

  516.     av_freep(&s->avg_data);

  517.     av_freep(&s->window_func_lut);

  518.     av_audio_fifo_free(s->fifo);

  519. }

  520. 

  521. static const AVFilterPad showfreqs_inputs[] = {

  522.     {

  523.         .name         = "default",

  524.         .type         = AVMEDIA_TYPE_AUDIO,

  525.     },

  526.     { NULL }

  527. };

  528. 

  529. static const AVFilterPad showfreqs_outputs[] = {

  530.     {

  531.         .name          = "default",

  532.         .type          = AVMEDIA_TYPE_VIDEO,

  533.         .config_props  = config_output,

  534.     },

  535.     { NULL }

  536. };

  537. 

  538. AVFilter ff_avf_showfreqs = {

  539.     .name          = "showfreqs",

  540.     .description   = NULL_IF_CONFIG_SMALL("Convert input audio to a frequencies video output."),

  541.     .init          = init,

  542.     .uninit        = uninit,

  543.     .query_formats = query_formats,

  544.     .priv_size     = sizeof(ShowFreqsContext),

  545.     .activate      = activate,

  546.     .inputs        = showfreqs_inputs,

  547.     .outputs       = showfreqs_outputs,

  548.     .priv_class    = &showfreqs_class,

  549. };