From 2fa019958b4f8d1412f0e021c0c0aa0645ec6c7a Mon Sep 17 00:00:00 2001 From: Paul B Mahol Date: Tue, 4 Aug 2015 14:41:35 +0200 Subject: avfilter: add showfreqs filter --- libavfilter/avf_showfreqs.c | 558 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 558 insertions(+) create mode 100644 libavfilter/avf_showfreqs.c (limited to 'libavfilter/avf_showfreqs.c') diff --git a/libavfilter/avf_showfreqs.c b/libavfilter/avf_showfreqs.c new file mode 100644 index 0000000000..a1ef0bf816 --- /dev/null +++ b/libavfilter/avf_showfreqs.c @@ -0,0 +1,558 @@ +/* + * Copyright (c) 2015 Paul B Mahol + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include + +#include "libavcodec/avfft.h" +#include "libavutil/audio_fifo.h" +#include "libavutil/avassert.h" +#include "libavutil/avstring.h" +#include "libavutil/channel_layout.h" +#include "libavutil/intreadwrite.h" +#include "libavutil/opt.h" +#include "libavutil/parseutils.h" +#include "audio.h" +#include "video.h" +#include "avfilter.h" +#include "internal.h" + +enum DisplayMode { LINE, BAR, DOT, NB_MODES }; +enum FrequencyScale { FS_LINEAR, FS_LOG, FS_RLOG, NB_FSCALES }; +enum AmplitudeScale { AS_LINEAR, AS_SQRT, AS_CBRT, AS_LOG, NB_ASCALES }; +enum WindowFunc { WFUNC_RECT, WFUNC_HANNING, WFUNC_HAMMING, WFUNC_BLACKMAN, + WFUNC_BARTLETT, WFUNC_WELCH, WFUNC_FLATTOP, + WFUNC_BHARRIS, WFUNC_BNUTTALL, WFUNC_SINE, WFUNC_NUTTALL, + WFUNC_BHANN, NB_WFUNC }; + +typedef struct ShowFreqsContext { + const AVClass *class; + int w, h; + int mode; + int fft_bits; + int ascale, fscale; + int avg; + int win_func; + FFTContext *fft; + FFTComplex **fft_data; + float **avg_data; + float *window_func_lut; + float overlap; + int skip_samples; + int nb_channels; + int nb_freq; + int win_size; + float scale; + char *colors; + AVAudioFifo *fifo; + int64_t pts; +} ShowFreqsContext; + +#define OFFSET(x) offsetof(ShowFreqsContext, x) +#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM + +static const AVOption showfreqs_options[] = { + { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "1024x512"}, 0, 0, FLAGS }, + { "s", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "1024x512"}, 0, 0, FLAGS }, + { "mode", "set display mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=BAR}, 0, NB_MODES-1, FLAGS, "mode" }, + { "line", "show lines", 0, AV_OPT_TYPE_CONST, {.i64=LINE}, 0, 0, FLAGS, "mode" }, + { "bar", "show bars", 0, AV_OPT_TYPE_CONST, {.i64=BAR}, 0, 0, FLAGS, "mode" }, + { "dot", "show dots", 0, AV_OPT_TYPE_CONST, {.i64=DOT}, 0, 0, FLAGS, "mode" }, + { "ascale", "set amplitude scale", OFFSET(ascale), AV_OPT_TYPE_INT, {.i64=AS_LOG}, 0, NB_ASCALES-1, FLAGS, "ascale" }, + { "lin", "linear", 0, AV_OPT_TYPE_CONST, {.i64=AS_LINEAR}, 0, 0, FLAGS, "ascale" }, + { "sqrt", "square root", 0, AV_OPT_TYPE_CONST, {.i64=AS_SQRT}, 0, 0, FLAGS, "ascale" }, + { "cbrt", "cubic root", 0, AV_OPT_TYPE_CONST, {.i64=AS_CBRT}, 0, 0, FLAGS, "ascale" }, + { "log", "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=AS_LOG}, 0, 0, FLAGS, "ascale" }, + { "fscale", "set frequency scale", OFFSET(fscale), AV_OPT_TYPE_INT, {.i64=FS_LINEAR}, 0, NB_FSCALES-1, FLAGS, "fscale" }, + { "lin", "linear", 0, AV_OPT_TYPE_CONST, {.i64=FS_LINEAR}, 0, 0, FLAGS, "fscale" }, + { "log", "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=FS_LOG}, 0, 0, FLAGS, "fscale" }, + { "rlog", "reverse logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=FS_RLOG}, 0, 0, FLAGS, "fscale" }, + { "win_size", "set window size", OFFSET(fft_bits), AV_OPT_TYPE_INT, {.i64=11}, 4, 16, FLAGS, "fft" }, + { "w16", 0, 0, AV_OPT_TYPE_CONST, {.i64=4}, 0, 0, FLAGS, "fft" }, + { "w32", 0, 0, AV_OPT_TYPE_CONST, {.i64=5}, 0, 0, FLAGS, "fft" }, + { "w64", 0, 0, AV_OPT_TYPE_CONST, {.i64=6}, 0, 0, FLAGS, "fft" }, + { "w128", 0, 0, AV_OPT_TYPE_CONST, {.i64=7}, 0, 0, FLAGS, "fft" }, + { "w256", 0, 0, AV_OPT_TYPE_CONST, {.i64=8}, 0, 0, FLAGS, "fft" }, + { "w512", 0, 0, AV_OPT_TYPE_CONST, {.i64=9}, 0, 0, FLAGS, "fft" }, + { "w1024", 0, 0, AV_OPT_TYPE_CONST, {.i64=10}, 0, 0, FLAGS, "fft" }, + { "w2048", 0, 0, AV_OPT_TYPE_CONST, {.i64=11}, 0, 0, FLAGS, "fft" }, + { "w4096", 0, 0, AV_OPT_TYPE_CONST, {.i64=12}, 0, 0, FLAGS, "fft" }, + { "w8192", 0, 0, AV_OPT_TYPE_CONST, {.i64=13}, 0, 0, FLAGS, "fft" }, + { "w16384", 0, 0, AV_OPT_TYPE_CONST, {.i64=14}, 0, 0, FLAGS, "fft" }, + { "w32768", 0, 0, AV_OPT_TYPE_CONST, {.i64=15}, 0, 0, FLAGS, "fft" }, + { "w65536", 0, 0, AV_OPT_TYPE_CONST, {.i64=16}, 0, 0, FLAGS, "fft" }, + { "win_func", "set window function", OFFSET(win_func), AV_OPT_TYPE_INT, {.i64=WFUNC_HANNING}, 0, NB_WFUNC-1, FLAGS, "win_func" }, + { "rect", "Rectangular", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_RECT}, 0, 0, FLAGS, "win_func" }, + { "bartlett", "Bartlett", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BARTLETT}, 0, 0, FLAGS, "win_func" }, + { "hanning", "Hanning", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HANNING}, 0, 0, FLAGS, "win_func" }, + { "hamming", "Hamming", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HAMMING}, 0, 0, FLAGS, "win_func" }, + { "blackman", "Blackman", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BLACKMAN}, 0, 0, FLAGS, "win_func" }, + { "welch", "Welch", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_WELCH}, 0, 0, FLAGS, "win_func" }, + { "flattop", "Flat-top", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_FLATTOP}, 0, 0, FLAGS, "win_func" }, + { "bharris", "Blackman-Harris", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHARRIS}, 0, 0, FLAGS, "win_func" }, + { "bnuttall", "Blackman-Nuttall", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BNUTTALL}, 0, 0, FLAGS, "win_func" }, + { "bhann", "Bartlett-Hann", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHANN}, 0, 0, FLAGS, "win_func" }, + { "sine", "Sine", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_SINE}, 0, 0, FLAGS, "win_func" }, + { "nuttall", "Nuttall", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_NUTTALL}, 0, 0, FLAGS, "win_func" }, + { "overlap", "set window overlap", OFFSET(overlap), AV_OPT_TYPE_FLOAT, {.dbl=1.}, 0., 1., FLAGS }, + { "averaging", "set time averaging", OFFSET(avg), AV_OPT_TYPE_INT, {.i64=1}, 0, INT32_MAX, FLAGS }, + { "colors", "set channels colors", OFFSET(colors), AV_OPT_TYPE_STRING, {.str = "red|green|blue|yellow|orange|lime|pink|magenta|brown" }, 0, 0, FLAGS }, + { NULL } +}; + +AVFILTER_DEFINE_CLASS(showfreqs); + +static int query_formats(AVFilterContext *ctx) +{ + AVFilterFormats *formats = NULL; + AVFilterChannelLayouts *layouts = NULL; + AVFilterLink *inlink = ctx->inputs[0]; + AVFilterLink *outlink = ctx->outputs[0]; + static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_NONE }; + static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_RGBA, AV_PIX_FMT_NONE }; + + /* set input audio formats */ + formats = ff_make_format_list(sample_fmts); + if (!formats) + return AVERROR(ENOMEM); + ff_formats_ref(formats, &inlink->out_formats); + + layouts = ff_all_channel_layouts(); + if (!layouts) + return AVERROR(ENOMEM); + ff_channel_layouts_ref(layouts, &inlink->out_channel_layouts); + + formats = ff_all_samplerates(); + if (!formats) + return AVERROR(ENOMEM); + ff_formats_ref(formats, &inlink->out_samplerates); + + /* set output video format */ + formats = ff_make_format_list(pix_fmts); + if (!formats) + return AVERROR(ENOMEM); + ff_formats_ref(formats, &outlink->in_formats); + + return 0; +} + +static void generate_window_func(float *lut, int N, int win_func, float *overlap) +{ + int n; + + switch (win_func) { + case WFUNC_RECT: + for (n = 0; n < N; n++) + lut[n] = 1.; + *overlap = 0.; + break; + case WFUNC_BARTLETT: + for (n = 0; n < N; n++) + lut[n] = 1.-FFABS((n-(N-1)/2.)/((N-1)/2.)); + *overlap = 0.5; + break; + case WFUNC_HANNING: + for (n = 0; n < N; n++) + lut[n] = .5*(1-cos(2*M_PI*n/(N-1))); + *overlap = 0.5; + break; + case WFUNC_HAMMING: + for (n = 0; n < N; n++) + lut[n] = .54-.46*cos(2*M_PI*n/(N-1)); + *overlap = 0.5; + break; + case WFUNC_BLACKMAN: + for (n = 0; n < N; n++) + lut[n] = .42659-.49656*cos(2*M_PI*n/(N-1))+.076849*cos(4*M_PI*n/(N-1)); + *overlap = 0.661; + break; + case WFUNC_WELCH: + for (n = 0; n < N; n++) + lut[n] = 1.-(n-(N-1)/2.)/((N-1)/2.)*(n-(N-1)/2.)/((N-1)/2.); + *overlap = 0.293; + break; + case WFUNC_FLATTOP: + for (n = 0; n < N; n++) + lut[n] = 1.-1.985844164102*cos( 2*M_PI*n/(N-1))+1.791176438506*cos( 4*M_PI*n/(N-1))- + 1.282075284005*cos( 6*M_PI*n/(N-1))+0.667777530266*cos( 8*M_PI*n/(N-1))- + 0.240160796576*cos(10*M_PI*n/(N-1))+0.056656381764*cos(12*M_PI*n/(N-1))- + 0.008134974479*cos(14*M_PI*n/(N-1))+0.000624544650*cos(16*M_PI*n/(N-1))- + 0.000019808998*cos(18*M_PI*n/(N-1))+0.000000132974*cos(20*M_PI*n/(N-1)); + *overlap = 0.841; + break; + case WFUNC_BHARRIS: + for (n = 0; n < N; n++) + lut[n] = 0.35875-0.48829*cos(2*M_PI*n/(N-1))+0.14128*cos(4*M_PI*n/(N-1))-0.01168*cos(6*M_PI*n/(N-1)); + *overlap = 0.661; + break; + case WFUNC_BNUTTALL: + for (n = 0; n < N; n++) + lut[n] = 0.3635819-0.4891775*cos(2*M_PI*n/(N-1))+0.1365995*cos(4*M_PI*n/(N-1))-0.0106411*cos(6*M_PI*n/(N-1)); + *overlap = 0.661; + break; + case WFUNC_BHANN: + for (n = 0; n < N; n++) + lut[n] = 0.62-0.48*FFABS(n/(N-1)-.5)-0.38*cos(2*M_PI*n/(N-1)); + *overlap = 0.5; + break; + case WFUNC_SINE: + for (n = 0; n < N; n++) + lut[n] = sin(M_PI*n/(N-1)); + *overlap = 0.75; + break; + case WFUNC_NUTTALL: + for (n = 0; n < N; n++) + lut[n] = 0.355768-0.487396*cos(2*M_PI*n/(N-1))+0.144232*cos(4*M_PI*n/(N-1))-0.012604*cos(6*M_PI*n/(N-1)); + *overlap = 0.663; + break; + default: + av_assert0(0); + } +} + +static int config_output(AVFilterLink *outlink) +{ + AVFilterContext *ctx = outlink->src; + AVFilterLink *inlink = ctx->inputs[0]; + ShowFreqsContext *s = ctx->priv; + float overlap; + int i; + + s->nb_freq = 1 << (s->fft_bits - 1); + s->win_size = s->nb_freq << 1; + av_audio_fifo_free(s->fifo); + av_fft_end(s->fft); + s->fft = av_fft_init(s->fft_bits, 0); + if (!s->fft) { + av_log(ctx, AV_LOG_ERROR, "Unable to create FFT context. " + "The window size might be too high.\n"); + return AVERROR(ENOMEM); + } + + /* FFT buffers: x2 for each (display) channel buffer. + * Note: we use free and malloc instead of a realloc-like function to + * make sure the buffer is aligned in memory for the FFT functions. */ + for (i = 0; i < s->nb_channels; i++) { + av_freep(&s->fft_data[i]); + av_freep(&s->avg_data[i]); + } + av_freep(&s->fft_data); + av_freep(&s->avg_data); + s->nb_channels = inlink->channels; + + s->fft_data = av_calloc(s->nb_channels, sizeof(*s->fft_data)); + if (!s->fft_data) + return AVERROR(ENOMEM); + s->avg_data = av_calloc(s->nb_channels, sizeof(*s->avg_data)); + if (!s->fft_data) + return AVERROR(ENOMEM); + for (i = 0; i < s->nb_channels; i++) { + s->fft_data[i] = av_calloc(s->win_size, sizeof(**s->fft_data)); + s->avg_data[i] = av_calloc(s->nb_freq, sizeof(**s->avg_data)); + if (!s->fft_data[i] || !s->avg_data[i]) + return AVERROR(ENOMEM); + } + + /* pre-calc windowing function */ + s->window_func_lut = av_realloc_f(s->window_func_lut, s->win_size, + sizeof(*s->window_func_lut)); + if (!s->window_func_lut) + return AVERROR(ENOMEM); + generate_window_func(s->window_func_lut, s->win_size, s->win_func, &overlap); + if (s->overlap == 1.) + s->overlap = overlap; + s->skip_samples = (1. - s->overlap) * s->win_size; + if (s->skip_samples < 1) { + av_log(ctx, AV_LOG_ERROR, "overlap %f too big\n", s->overlap); + return AVERROR(EINVAL); + } + + for (s->scale = 0, i = 0; i < s->win_size; i++) { + s->scale += s->window_func_lut[i] * s->window_func_lut[i]; + } + + outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP; + outlink->frame_rate = av_make_q(inlink->sample_rate, s->win_size * (1.-s->overlap)); + outlink->sample_aspect_ratio = (AVRational){1,1}; + outlink->w = s->w; + outlink->h = s->h; + + s->fifo = av_audio_fifo_alloc(inlink->format, inlink->channels, s->win_size); + if (!s->fifo) + return AVERROR(ENOMEM); + return 0; +} + +static inline void draw_dot(AVFrame *out, int x, int y, uint8_t fg[4]) +{ + + uint32_t color = AV_RL32(out->data[0] + y * out->linesize[0] + x * 4); + + if ((color & 0xffffff) != 0) + AV_WL32(out->data[0] + y * out->linesize[0] + x * 4, AV_RL32(fg) | color); + else + AV_WL32(out->data[0] + y * out->linesize[0] + x * 4, AV_RL32(fg)); +} + +static int get_sx(ShowFreqsContext *s, int f) +{ + switch (s->fscale) { + case FS_LINEAR: + return (s->w/(float)s->nb_freq)*f; + case FS_LOG: + return s->w-pow(s->w, (s->nb_freq-f-1)/(s->nb_freq-1.)); + case FS_RLOG: + return pow(s->w, f/(s->nb_freq-1.)); + } + + return 0; +} + +static float get_bsize(ShowFreqsContext *s, int f) +{ + switch (s->fscale) { + case FS_LINEAR: + return s->w/(float)s->nb_freq; + case FS_LOG: + return pow(s->w, (s->nb_freq-f-1)/(s->nb_freq-1.))- + pow(s->w, (s->nb_freq-f-2)/(s->nb_freq-1.)); + case FS_RLOG: + return pow(s->w, (f+1)/(s->nb_freq-1.))- + pow(s->w, f /(s->nb_freq-1.)); + } + + return 1.; +} + +static inline void plot_freq(ShowFreqsContext *s, int ch, + double a, int f, uint8_t fg[4], int *prev_y, + AVFrame *out, AVFilterLink *outlink) +{ + const int w = s->w; + const float avg = s->avg_data[ch][f]; + const float bsize = get_bsize(s, f); + const int sx = get_sx(s, f); + int x, y, i; + + switch(s->ascale) { + case AS_SQRT: + a = 1.0 - sqrt(a); + break; + case AS_CBRT: + a = 1.0 - cbrt(a); + break; + case AS_LOG: + a = log(av_clipd(a, 1e-6, 1)) / log(1e-6); + break; + case AS_LINEAR: + a = 1.0 - a; + break; + } + y = a * outlink->h - 1; + if (y < 0) + return; + + switch (s->avg) { + case 0: + y = s->avg_data[ch][f] = !outlink->frame_count ? y : FFMIN(avg, y); + break; + case 1: + break; + default: + s->avg_data[ch][f] = avg + y * (y - avg) / (FFMIN(outlink->frame_count + 1, s->avg) * y); + y = s->avg_data[ch][f]; + break; + } + + switch(s->mode) { + case LINE: + if (*prev_y == -1) { + *prev_y = y; + } + if (y <= *prev_y) { + for (x = sx + 1; x < sx + bsize && x < w; x++) + draw_dot(out, x, y, fg); + for (i = y; i <= *prev_y; i++) + draw_dot(out, sx, i, fg); + } else { + for (i = *prev_y; i <= y; i++) + draw_dot(out, sx, i, fg); + for (x = sx + 1; x < sx + bsize && x < w; x++) + draw_dot(out, x, i - 1, fg); + } + *prev_y = y; + break; + case BAR: + for (x = sx; x < sx + bsize && x < w; x++) + for (i = y; i < outlink->h; i++) + draw_dot(out, x, i, fg); + break; + case DOT: + for (x = sx; x < sx + bsize && x < w; x++) + draw_dot(out, x, y, fg); + break; + } +} + +static int plot_freqs(AVFilterLink *inlink, AVFrame *in) +{ + AVFilterContext *ctx = inlink->dst; + AVFilterLink *outlink = ctx->outputs[0]; + ShowFreqsContext *s = ctx->priv; + const int win_size = s->win_size; + char *colors, *color, *saveptr = NULL; + AVFrame *out; + int ch, n; + + out = ff_get_video_buffer(outlink, outlink->w, outlink->h); + if (!out) + return AVERROR(ENOMEM); + + for (n = 0; n < outlink->h; n++) + memset(out->data[0] + out->linesize[0] * n, 0, outlink->w * 4); + + /* fill FFT input with the number of samples available */ + for (ch = 0; ch < s->nb_channels; ch++) { + const float *p = (float *)in->extended_data[ch]; + + for (n = 0; n < in->nb_samples; n++) { + s->fft_data[ch][n].re = p[n] * s->window_func_lut[n]; + s->fft_data[ch][n].im = 0; + } + for (; n < win_size; n++) { + s->fft_data[ch][n].re = 0; + s->fft_data[ch][n].im = 0; + } + } + + /* run FFT on each samples set */ + for (ch = 0; ch < s->nb_channels; ch++) { + av_fft_permute(s->fft, s->fft_data[ch]); + av_fft_calc(s->fft, s->fft_data[ch]); + } + +#define RE(x, ch) s->fft_data[ch][x].re +#define IM(x, ch) s->fft_data[ch][x].im +#define M(a, b) (sqrt((a) * (a) + (b) * (b))) + + colors = av_strdup(s->colors); + if (!colors) + return AVERROR(ENOMEM); + + for (ch = 0; ch < s->nb_channels; ch++) { + uint8_t fg[4] = { 0xff, 0xff, 0xff, 0xff }; + int prev_y = -1, f; + double a; + + color = av_strtok(ch == 0 ? colors : NULL, " |", &saveptr); + if (color) + av_parse_color(fg, color, -1, ctx); + + a = av_clipd(M(RE(0, ch), 0) / s->scale, 0, 1); + plot_freq(s, ch, a, 0, fg, &prev_y, out, outlink); + + for (f = 1; f < s->nb_freq; f++) { + a = av_clipd(M(RE(f, ch), IM(f, ch)) / s->scale, 0, 1); + + plot_freq(s, ch, a, f, fg, &prev_y, out, outlink); + } + } + + av_free(colors); + out->pts = in->pts; + return ff_filter_frame(outlink, out); +} + +static int filter_frame(AVFilterLink *inlink, AVFrame *in) +{ + AVFilterContext *ctx = inlink->dst; + ShowFreqsContext *s = ctx->priv; + AVFrame *fin = NULL; + int ret; + + av_audio_fifo_write(s->fifo, (void **)in->extended_data, in->nb_samples); + while (av_audio_fifo_size(s->fifo) >= s->win_size) { + fin = ff_get_audio_buffer(inlink, s->win_size); + if (!fin) { + ret = AVERROR(ENOMEM); + goto fail; + } + + fin->pts = s->pts; + s->pts += s->skip_samples; + ret = av_audio_fifo_peek(s->fifo, (void **)fin->extended_data, s->win_size); + if (ret < 0) + goto fail; + + ret = plot_freqs(inlink, fin); + av_audio_fifo_drain(s->fifo, s->skip_samples); + if (ret < 0) + goto fail; + } + +fail: + av_frame_free(&fin); + av_frame_free(&in); + return ret; +} + +static av_cold void uninit(AVFilterContext *ctx) +{ + ShowFreqsContext *s = ctx->priv; + int i; + + av_fft_end(s->fft); + for (i = 0; i < s->nb_channels; i++) { + av_freep(&s->fft_data[i]); + av_freep(&s->avg_data[i]); + } + av_freep(&s->fft_data); + av_freep(&s->avg_data); + av_freep(&s->window_func_lut); + av_audio_fifo_free(s->fifo); +} + +static const AVFilterPad showfreqs_inputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_AUDIO, + .filter_frame = filter_frame, + }, + { NULL } +}; + +static const AVFilterPad showfreqs_outputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + .config_props = config_output, + }, + { NULL } +}; + +AVFilter ff_avf_showfreqs = { + .name = "showfreqs", + .description = NULL_IF_CONFIG_SMALL("Convert input audio to a frequencies video output."), + .uninit = uninit, + .query_formats = query_formats, + .priv_size = sizeof(ShowFreqsContext), + .inputs = showfreqs_inputs, + .outputs = showfreqs_outputs, + .priv_class = &showfreqs_class, +}; -- cgit v1.2.3