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FFmpeg/libavfilter/avf_showfreqs.c
Ganesh Ajjanagadde 8507b98c10 avfilter,swresample,swscale: use fabs, fabsf instead of FFABS 
It is well known that fabs and fabsf are at least as fast and sometimes
faster than the FFABS macro, at least on the gcc+glibc combination.
For instance, see the reference:
http://patchwork.sourceware.org/patch/6735/.
This was a patch to glibc in order to remove their usages of a macro.

The reason essentially boils down to fabs using the __builtin_fabs of
the compiler, while FFABS needs to infer to not use a branch and to
simply change the sign bit. Usually the inference works, but sometimes
it does not. This may be easily checked by looking at the asm.

This also has the added benefit of reducing macro usage, which has
problems with side-effects.

Note that avcodec is not handled here, as it is huge and
most things there are integer arithmetic anyway.

Tested with FATE.

Reviewed-by: Clément Bœsch <u@pkh.me>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
2015-10-22 16:13:26 -04:00

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/*
* 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 <math.h>
#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, WFUNC_LANCZOS, WFUNC_GAUSS, 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" },
{ "lanczos", "Lanczos", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_LANCZOS}, 0, 0, FLAGS, "win_func" },
{ "gauss", "Gauss", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_GAUSS}, 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 };
int ret;
/* set input audio formats */
formats = ff_make_format_list(sample_fmts);
if ((ret = ff_formats_ref(formats, &inlink->out_formats)) < 0)
return ret;
layouts = ff_all_channel_layouts();
if ((ret = ff_channel_layouts_ref(layouts, &inlink->out_channel_layouts)) < 0)
return ret;
formats = ff_all_samplerates();
if ((ret = ff_formats_ref(formats, &inlink->out_samplerates)) < 0)
return ret;
/* set output video format */
formats = ff_make_format_list(pix_fmts);
if ((ret = ff_formats_ref(formats, &outlink->in_formats)) < 0)
return ret;
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.-fabs((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*fabs(n/(double)(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;
case WFUNC_LANCZOS:
#define SINC(x) (!(x)) ? 1 : sin(M_PI * (x))/(M_PI * (x));
for (n = 0; n < N; n++)
lut[n] = SINC((2.*n)/(N-1)-1);
*overlap = 0.75;
break;
case WFUNC_GAUSS:
for (n = 0; n < N; n++)
lut[n] = pow(M_E,-0.5*pow((n-(N-1)/2)/(0.4*(N-1)/2.f),2));
*overlap = 0.75;
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->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) {
av_frame_free(&out);
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 = 0;
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_frame_free(&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,
};
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