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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_size;

  50.     int fft_bits;

  51.     int ascale, fscale;

  52.     int avg;

  53.     int win_func;

  54.     FFTContext *fft;

  55.     FFTComplex **fft_data;

  56.     float **avg_data;

  57.     float *window_func_lut;

  58.     float overlap;

  59.     float minamp;

  60.     int hop_size;

  61.     int nb_channels;

  62.     int nb_freq;

  63.     int win_size;

  64.     float scale;

  65.     char *colors;

  66.     AVAudioFifo *fifo;

  67.     int64_t pts;

  68. } ShowFreqsContext;

  69. 

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

  71. #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

  72. 

  73. static const AVOption showfreqs_options[] = {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  89.     { "win_size", "set window size", OFFSET(fft_size), AV_OPT_TYPE_INT, {.i64=2048}, 16, 65536, FLAGS },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  118.     { NULL }

  119. };

  120. 

  121. AVFILTER_DEFINE_CLASS(showfreqs);

  122. 

  123. static int query_formats(AVFilterContext *ctx)

  124. {

  125.     AVFilterFormats *formats = NULL;

  126.     AVFilterChannelLayouts *layouts = NULL;

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

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

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

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

  131.     int ret;

  132. 

  133.     /* set input audio formats */

  134.     formats = ff_make_format_list(sample_fmts);

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

  136.         return ret;

  137. 

  138.     layouts = ff_all_channel_layouts();

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

  140.         return ret;

  141. 

  142.     formats = ff_all_samplerates();

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

  144.         return ret;

  145. 

  146.     /* set output video format */

  147.     formats = ff_make_format_list(pix_fmts);

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

  149.         return ret;

  150. 

  151.     return 0;

  152. }

  153. 

  154. static av_cold int init(AVFilterContext *ctx)

  155. {

  156.     ShowFreqsContext *s = ctx->priv;

  157. 

  158.     s->pts = AV_NOPTS_VALUE;

  159. 

  160.     return 0;

  161. }

  162. 

  163. static int config_output(AVFilterLink *outlink)

  164. {

  165.     AVFilterContext *ctx = outlink->src;

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

  167.     ShowFreqsContext *s = ctx->priv;

  168.     float overlap;

  169.     int i;

  170. 

  171.     s->fft_bits = av_log2(s->fft_size);

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

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

  174.     av_audio_fifo_free(s->fifo);

  175.     av_fft_end(s->fft);

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

  177.     if (!s->fft) {

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

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

  180.         return AVERROR(ENOMEM);

  181.     }

  182. 

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

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

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

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

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

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

  189.     }

  190.     av_freep(&s->fft_data);

  191.     av_freep(&s->avg_data);

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

  193. 

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

  195.     if (!s->fft_data)

  196.         return AVERROR(ENOMEM);

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

  198.     if (!s->avg_data)

  199.         return AVERROR(ENOMEM);

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

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

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

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

  204.             return AVERROR(ENOMEM);

  205.     }

  206. 

  207.     /* pre-calc windowing function */

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

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

  210.     if (!s->window_func_lut)

  211.         return AVERROR(ENOMEM);

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

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

  214.         s->overlap = overlap;

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

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

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

  218.         return AVERROR(EINVAL);

  219.     }

  220. 

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

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

  223.     }

  224. 

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

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

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

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

  229. 

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

  231.     if (!s->fifo)

  232.         return AVERROR(ENOMEM);

  233.     return 0;

  234. }

  235. 

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

  237. {

  238. 

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

  240. 

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

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

  243.     else

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

  245. }

  246. 

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

  248. {

  249.     switch (s->fscale) {

  250.     case FS_LINEAR:

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

  252.     case FS_LOG:

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

  254.     case FS_RLOG:

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

  256.     }

  257. 

  258.     return 0;

  259. }

  260. 

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

  262. {

  263.     switch (s->fscale) {

  264.     case FS_LINEAR:

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

  266.     case FS_LOG:

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

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

  269.     case FS_RLOG:

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

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

  272.     }

  273. 

  274.     return 1.;

  275. }

  276. 

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

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

  279.                              AVFrame *out, AVFilterLink *outlink)

  280. {

  281.     const int w = s->w;

  282.     const float min = s->minamp;

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

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

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

  286.     int end = outlink->h;

  287.     int x, y, i;

  288. 

  289.     switch(s->ascale) {

  290.     case AS_SQRT:

  291.         a = 1.0 - sqrt(a);

  292.         break;

  293.     case AS_CBRT:

  294.         a = 1.0 - cbrt(a);

  295.         break;

  296.     case AS_LOG:

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

  298.         break;

  299.     case AS_LINEAR:

  300.         a = 1.0 - a;

  301.         break;

  302.     }

  303. 

  304.     switch (s->cmode) {

  305.     case COMBINED:

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

  307.         break;

  308.     case SEPARATE:

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

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

  311.         break;

  312.     default:

  313.         av_assert0(0);

  314.     }

  315.     if (y < 0)

  316.         return;

  317. 

  318.     switch (s->avg) {

  319.     case 0:

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

  321.         break;

  322.     case 1:

  323.         break;

  324.     default:

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

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

  327.         break;

  328.     }

  329. 

  330.     switch(s->mode) {

  331.     case LINE:

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

  333.             *prev_y = y;

  334.         }

  335.         if (y <= *prev_y) {

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

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

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

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

  340.         } else {

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

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

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

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

  345.         }

  346.         *prev_y = y;

  347.         break;

  348.     case BAR:

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

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

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

  352.         break;

  353.     case DOT:

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

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

  356.         break;

  357.     }

  358. }

  359. 

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

  361. {

  362.     AVFilterContext *ctx = inlink->dst;

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

  364.     ShowFreqsContext *s = ctx->priv;

  365.     const int win_size = s->win_size;

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

  367.     AVFrame *out;

  368.     int ch, n;

  369. 

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

  371.     if (!out)

  372.         return AVERROR(ENOMEM);

  373. 

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

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

  376. 

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

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

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

  380. 

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

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

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

  384.         }

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

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

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

  388.         }

  389.     }

  390. 

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

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

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

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

  395.     }

  396. 

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

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

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

  400. 

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

  402.     if (!colors) {

  403.         av_frame_free(&out);

  404.         return AVERROR(ENOMEM);

  405.     }

  406. 

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

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

  409.         int prev_y = -1, f;

  410.         double a;

  411. 

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

  413.         if (color)

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

  415. 

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

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

  418. 

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

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

  421. 

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

  423.         }

  424.     }

  425. 

  426.     av_free(colors);

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

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

  429.     return ff_filter_frame(outlink, out);

  430. }

  431. 

  432. static int filter_frame(AVFilterLink *inlink)

  433. {

  434.     AVFilterContext *ctx = inlink->dst;

  435.     ShowFreqsContext *s = ctx->priv;

  436.     AVFrame *fin = NULL;

  437.     int ret = 0;

  438. 

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

  440.     if (!fin) {

  441.         ret = AVERROR(ENOMEM);

  442.         goto fail;

  443.     }

  444. 

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

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

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

  448.     if (ret < 0)

  449.         goto fail;

  450. 

  451.     ret = plot_freqs(inlink, fin);

  452.     av_frame_free(&fin);

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

  454. 

  455. fail:

  456.     av_frame_free(&fin);

  457.     return ret;

  458. }

  459. 

  460. static int activate(AVFilterContext *ctx)

  461. {

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

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

  464.     ShowFreqsContext *s = ctx->priv;

  465.     AVFrame *in = NULL;

  466.     int ret = 0;

  467. 

  468.     FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);

  469. 

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

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

  472.     if (ret < 0)

  473.         return ret;

  474.     if (ret > 0) {

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

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

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

  478.     }

  479. 

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

  481.         ret = filter_frame(inlink);

  482.         if (ret <= 0)

  483.             return ret;

  484.     }

  485. 

  486.     FF_FILTER_FORWARD_STATUS(inlink, outlink);

  487.     FF_FILTER_FORWARD_WANTED(outlink, inlink);

  488. 

  489.     return FFERROR_NOT_READY;

  490. }

  491. 

  492. static av_cold void uninit(AVFilterContext *ctx)

  493. {

  494.     ShowFreqsContext *s = ctx->priv;

  495.     int i;

  496. 

  497.     av_fft_end(s->fft);

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

  499.         if (s->fft_data)

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

  501.         if (s->avg_data)

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

  503.     }

  504.     av_freep(&s->fft_data);

  505.     av_freep(&s->avg_data);

  506.     av_freep(&s->window_func_lut);

  507.     av_audio_fifo_free(s->fifo);

  508. }

  509. 

  510. static const AVFilterPad showfreqs_inputs[] = {

  511.     {

  512.         .name         = "default",

  513.         .type         = AVMEDIA_TYPE_AUDIO,

  514.     },

  515.     { NULL }

  516. };

  517. 

  518. static const AVFilterPad showfreqs_outputs[] = {

  519.     {

  520.         .name          = "default",

  521.         .type          = AVMEDIA_TYPE_VIDEO,

  522.         .config_props  = config_output,

  523.     },

  524.     { NULL }

  525. };

  526. 

  527. AVFilter ff_avf_showfreqs = {

  528.     .name          = "showfreqs",

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

  530.     .init          = init,

  531.     .uninit        = uninit,

  532.     .query_formats = query_formats,

  533.     .priv_size     = sizeof(ShowFreqsContext),

  534.     .activate      = activate,

  535.     .inputs        = showfreqs_inputs,

  536.     .outputs       = showfreqs_outputs,

  537.     .priv_class    = &showfreqs_class,

  538. };