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avfilter: add showfreqs filter
This commit is contained in:
Paul B Mahol
parent
e6b8797b82
commit
2fa019958b
@ -31,6 +31,7 @@ version <next>:
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- atadenoise video filter
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- OS X VideoToolbox support
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- aphasemeter filter
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- showfreqs filter
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version 2.7:
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2
configure
vendored
2
configure
vendored
@ -2785,6 +2785,8 @@ select_filter_select="pixelutils"
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smartblur_filter_deps="gpl swscale"
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showcqt_filter_deps="avcodec"
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showcqt_filter_select="fft"
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showfreqs_filter_deps="avcodec"
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showfreqs_filter_select="fft"
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showspectrum_filter_deps="avcodec"
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showspectrum_filter_select="rdft"
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spp_filter_deps="gpl avcodec"
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115
doc/filters.texi
115
doc/filters.texi
@ -12704,6 +12704,121 @@ gamma=2:gamma2=2
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@end itemize
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@section showfreqs
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Convert input audio to video output representing the audio power spectrum.
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Audio amplitude is on Y-axis while frequency is on X-axis.
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The filter accepts the following options:
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@table @option
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@item size, s
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Specify size of video. For the syntax of this option, check the
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@ref{video size syntax,,"Video size" section in the ffmpeg-utils manual,ffmpeg-utils}.
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Default is @code{1024x512}.
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@item mode
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Set display mode.
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This set how each frequency bin will be represented.
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It accepts the following values:
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@table @samp
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@item line
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@item bar
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@item dot
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@end table
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Default is @code{bar}.
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@item ascale
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Set amplitude scale.
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It accepts the following values:
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@table @samp
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@item lin
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Linear scale.
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@item sqrt
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Square root scale.
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@item cbrt
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Cubic root scale.
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@item log
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Logarithmic scale.
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@end table
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Default is @code{log}.
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@item fscale
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Set frequency scale.
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It accepts the following values:
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@table @samp
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@item lin
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Linear scale.
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@item log
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Logarithmic scale.
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@item rlog
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Reverse logarithmic scale.
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@end table
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Default is @code{lin}.
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@item win_size
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Set window size.
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It accepts the following values:
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@table @samp
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@item w16
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@item w32
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@item w64
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@item w128
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@item w256
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@item w512
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@item w1024
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@item w2048
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@item w4096
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@item w8192
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@item w16384
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@item w32768
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@item w65536
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@end table
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Default is @code{w2048}
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@item win_func
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Set windowing function.
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It accepts the following values:
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@table @samp
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@item rect
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@item bartlett
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@item hanning
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@item hamming
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@item blackman
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@item welch
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@item flattop
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@item bharris
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@item bnuttall
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@item bhann
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@item sine
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@item nuttall
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@end table
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Default is @code{hanning}.
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@item overlap
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Set window overlap. In range @code{[0, 1]}. Default is @code{1},
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which means optimal overlap for selected window function will be picked.
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@item averaging
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Set time averaging. Setting this to 0 will display current maximal peaks.
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Default is @code{1}, which means time averaging is disabled.
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@item color
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Specify list of colors separated by space or by '|' which will be used to
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draw channel frequencies. Unrecognized or missing colors will be replaced
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by white color.
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@end table
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@section showspectrum
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Convert input audio to a video output, representing the audio frequency
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@ -258,6 +258,7 @@ OBJS-$(CONFIG_APHASEMETER_FILTER) += avf_aphasemeter.o
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OBJS-$(CONFIG_AVECTORSCOPE_FILTER) += avf_avectorscope.o
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OBJS-$(CONFIG_CONCAT_FILTER) += avf_concat.o
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OBJS-$(CONFIG_SHOWCQT_FILTER) += avf_showcqt.o
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OBJS-$(CONFIG_SHOWFREQS_FILTER) += avf_showfreqs.o
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OBJS-$(CONFIG_SHOWSPECTRUM_FILTER) += avf_showspectrum.o
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OBJS-$(CONFIG_SHOWVOLUME_FILTER) += avf_showvolume.o
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OBJS-$(CONFIG_SHOWWAVES_FILTER) += avf_showwaves.o
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@ -273,6 +273,7 @@ void avfilter_register_all(void)
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REGISTER_FILTER(AVECTORSCOPE, avectorscope, avf);
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REGISTER_FILTER(CONCAT, concat, avf);
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REGISTER_FILTER(SHOWCQT, showcqt, avf);
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REGISTER_FILTER(SHOWFREQS, showfreqs, avf);
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REGISTER_FILTER(SHOWSPECTRUM, showspectrum, avf);
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REGISTER_FILTER(SHOWVOLUME, showvolume, avf);
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REGISTER_FILTER(SHOWWAVES, showwaves, avf);
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558
libavfilter/avf_showfreqs.c
Normal file
558
libavfilter/avf_showfreqs.c
Normal file
@ -0,0 +1,558 @@
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/*
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* Copyright (c) 2015 Paul B Mahol
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <math.h>
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#include "libavcodec/avfft.h"
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#include "libavutil/audio_fifo.h"
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#include "libavutil/avassert.h"
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#include "libavutil/avstring.h"
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#include "libavutil/channel_layout.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/opt.h"
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#include "libavutil/parseutils.h"
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#include "audio.h"
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#include "video.h"
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#include "avfilter.h"
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#include "internal.h"
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enum DisplayMode { LINE, BAR, DOT, NB_MODES };
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enum FrequencyScale { FS_LINEAR, FS_LOG, FS_RLOG, NB_FSCALES };
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enum AmplitudeScale { AS_LINEAR, AS_SQRT, AS_CBRT, AS_LOG, NB_ASCALES };
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enum WindowFunc { WFUNC_RECT, WFUNC_HANNING, WFUNC_HAMMING, WFUNC_BLACKMAN,
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WFUNC_BARTLETT, WFUNC_WELCH, WFUNC_FLATTOP,
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WFUNC_BHARRIS, WFUNC_BNUTTALL, WFUNC_SINE, WFUNC_NUTTALL,
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WFUNC_BHANN, NB_WFUNC };
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typedef struct ShowFreqsContext {
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const AVClass *class;
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int w, h;
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int mode;
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int fft_bits;
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int ascale, fscale;
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int avg;
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int win_func;
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FFTContext *fft;
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FFTComplex **fft_data;
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float **avg_data;
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float *window_func_lut;
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float overlap;
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int skip_samples;
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int nb_channels;
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int nb_freq;
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int win_size;
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float scale;
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char *colors;
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AVAudioFifo *fifo;
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int64_t pts;
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} ShowFreqsContext;
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#define OFFSET(x) offsetof(ShowFreqsContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption showfreqs_options[] = {
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{ "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "1024x512"}, 0, 0, FLAGS },
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{ "s", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "1024x512"}, 0, 0, FLAGS },
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{ "mode", "set display mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=BAR}, 0, NB_MODES-1, FLAGS, "mode" },
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{ "line", "show lines", 0, AV_OPT_TYPE_CONST, {.i64=LINE}, 0, 0, FLAGS, "mode" },
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{ "bar", "show bars", 0, AV_OPT_TYPE_CONST, {.i64=BAR}, 0, 0, FLAGS, "mode" },
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{ "dot", "show dots", 0, AV_OPT_TYPE_CONST, {.i64=DOT}, 0, 0, FLAGS, "mode" },
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{ "ascale", "set amplitude scale", OFFSET(ascale), AV_OPT_TYPE_INT, {.i64=AS_LOG}, 0, NB_ASCALES-1, FLAGS, "ascale" },
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{ "lin", "linear", 0, AV_OPT_TYPE_CONST, {.i64=AS_LINEAR}, 0, 0, FLAGS, "ascale" },
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{ "sqrt", "square root", 0, AV_OPT_TYPE_CONST, {.i64=AS_SQRT}, 0, 0, FLAGS, "ascale" },
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{ "cbrt", "cubic root", 0, AV_OPT_TYPE_CONST, {.i64=AS_CBRT}, 0, 0, FLAGS, "ascale" },
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{ "log", "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=AS_LOG}, 0, 0, FLAGS, "ascale" },
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{ "fscale", "set frequency scale", OFFSET(fscale), AV_OPT_TYPE_INT, {.i64=FS_LINEAR}, 0, NB_FSCALES-1, FLAGS, "fscale" },
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{ "lin", "linear", 0, AV_OPT_TYPE_CONST, {.i64=FS_LINEAR}, 0, 0, FLAGS, "fscale" },
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{ "log", "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=FS_LOG}, 0, 0, FLAGS, "fscale" },
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{ "rlog", "reverse logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=FS_RLOG}, 0, 0, FLAGS, "fscale" },
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{ "win_size", "set window size", OFFSET(fft_bits), AV_OPT_TYPE_INT, {.i64=11}, 4, 16, FLAGS, "fft" },
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{ "w16", 0, 0, AV_OPT_TYPE_CONST, {.i64=4}, 0, 0, FLAGS, "fft" },
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{ "w32", 0, 0, AV_OPT_TYPE_CONST, {.i64=5}, 0, 0, FLAGS, "fft" },
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{ "w64", 0, 0, AV_OPT_TYPE_CONST, {.i64=6}, 0, 0, FLAGS, "fft" },
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{ "w128", 0, 0, AV_OPT_TYPE_CONST, {.i64=7}, 0, 0, FLAGS, "fft" },
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{ "w256", 0, 0, AV_OPT_TYPE_CONST, {.i64=8}, 0, 0, FLAGS, "fft" },
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{ "w512", 0, 0, AV_OPT_TYPE_CONST, {.i64=9}, 0, 0, FLAGS, "fft" },
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{ "w1024", 0, 0, AV_OPT_TYPE_CONST, {.i64=10}, 0, 0, FLAGS, "fft" },
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{ "w2048", 0, 0, AV_OPT_TYPE_CONST, {.i64=11}, 0, 0, FLAGS, "fft" },
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{ "w4096", 0, 0, AV_OPT_TYPE_CONST, {.i64=12}, 0, 0, FLAGS, "fft" },
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{ "w8192", 0, 0, AV_OPT_TYPE_CONST, {.i64=13}, 0, 0, FLAGS, "fft" },
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{ "w16384", 0, 0, AV_OPT_TYPE_CONST, {.i64=14}, 0, 0, FLAGS, "fft" },
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{ "w32768", 0, 0, AV_OPT_TYPE_CONST, {.i64=15}, 0, 0, FLAGS, "fft" },
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{ "w65536", 0, 0, AV_OPT_TYPE_CONST, {.i64=16}, 0, 0, FLAGS, "fft" },
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{ "win_func", "set window function", OFFSET(win_func), AV_OPT_TYPE_INT, {.i64=WFUNC_HANNING}, 0, NB_WFUNC-1, FLAGS, "win_func" },
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{ "rect", "Rectangular", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_RECT}, 0, 0, FLAGS, "win_func" },
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{ "bartlett", "Bartlett", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BARTLETT}, 0, 0, FLAGS, "win_func" },
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{ "hanning", "Hanning", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HANNING}, 0, 0, FLAGS, "win_func" },
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{ "hamming", "Hamming", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HAMMING}, 0, 0, FLAGS, "win_func" },
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{ "blackman", "Blackman", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BLACKMAN}, 0, 0, FLAGS, "win_func" },
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{ "welch", "Welch", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_WELCH}, 0, 0, FLAGS, "win_func" },
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{ "flattop", "Flat-top", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_FLATTOP}, 0, 0, FLAGS, "win_func" },
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{ "bharris", "Blackman-Harris", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHARRIS}, 0, 0, FLAGS, "win_func" },
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{ "bnuttall", "Blackman-Nuttall", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BNUTTALL}, 0, 0, FLAGS, "win_func" },
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{ "bhann", "Bartlett-Hann", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHANN}, 0, 0, FLAGS, "win_func" },
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{ "sine", "Sine", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_SINE}, 0, 0, FLAGS, "win_func" },
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{ "nuttall", "Nuttall", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_NUTTALL}, 0, 0, FLAGS, "win_func" },
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{ "overlap", "set window overlap", OFFSET(overlap), AV_OPT_TYPE_FLOAT, {.dbl=1.}, 0., 1., FLAGS },
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{ "averaging", "set time averaging", OFFSET(avg), AV_OPT_TYPE_INT, {.i64=1}, 0, INT32_MAX, FLAGS },
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{ "colors", "set channels colors", OFFSET(colors), AV_OPT_TYPE_STRING, {.str = "red|green|blue|yellow|orange|lime|pink|magenta|brown" }, 0, 0, FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(showfreqs);
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static int query_formats(AVFilterContext *ctx)
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{
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AVFilterFormats *formats = NULL;
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AVFilterChannelLayouts *layouts = NULL;
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AVFilterLink *inlink = ctx->inputs[0];
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AVFilterLink *outlink = ctx->outputs[0];
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static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_NONE };
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static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_RGBA, AV_PIX_FMT_NONE };
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/* set input audio formats */
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formats = ff_make_format_list(sample_fmts);
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if (!formats)
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return AVERROR(ENOMEM);
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ff_formats_ref(formats, &inlink->out_formats);
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layouts = ff_all_channel_layouts();
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if (!layouts)
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return AVERROR(ENOMEM);
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ff_channel_layouts_ref(layouts, &inlink->out_channel_layouts);
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formats = ff_all_samplerates();
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if (!formats)
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return AVERROR(ENOMEM);
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ff_formats_ref(formats, &inlink->out_samplerates);
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/* set output video format */
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formats = ff_make_format_list(pix_fmts);
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if (!formats)
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return AVERROR(ENOMEM);
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ff_formats_ref(formats, &outlink->in_formats);
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return 0;
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}
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static void generate_window_func(float *lut, int N, int win_func, float *overlap)
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{
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int n;
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switch (win_func) {
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case WFUNC_RECT:
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for (n = 0; n < N; n++)
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lut[n] = 1.;
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*overlap = 0.;
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break;
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case WFUNC_BARTLETT:
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for (n = 0; n < N; n++)
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lut[n] = 1.-FFABS((n-(N-1)/2.)/((N-1)/2.));
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*overlap = 0.5;
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break;
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case WFUNC_HANNING:
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for (n = 0; n < N; n++)
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lut[n] = .5*(1-cos(2*M_PI*n/(N-1)));
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*overlap = 0.5;
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break;
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case WFUNC_HAMMING:
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for (n = 0; n < N; n++)
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lut[n] = .54-.46*cos(2*M_PI*n/(N-1));
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*overlap = 0.5;
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break;
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case WFUNC_BLACKMAN:
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for (n = 0; n < N; n++)
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lut[n] = .42659-.49656*cos(2*M_PI*n/(N-1))+.076849*cos(4*M_PI*n/(N-1));
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*overlap = 0.661;
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break;
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case WFUNC_WELCH:
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for (n = 0; n < N; n++)
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lut[n] = 1.-(n-(N-1)/2.)/((N-1)/2.)*(n-(N-1)/2.)/((N-1)/2.);
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*overlap = 0.293;
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break;
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case WFUNC_FLATTOP:
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for (n = 0; n < N; n++)
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lut[n] = 1.-1.985844164102*cos( 2*M_PI*n/(N-1))+1.791176438506*cos( 4*M_PI*n/(N-1))-
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1.282075284005*cos( 6*M_PI*n/(N-1))+0.667777530266*cos( 8*M_PI*n/(N-1))-
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0.240160796576*cos(10*M_PI*n/(N-1))+0.056656381764*cos(12*M_PI*n/(N-1))-
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0.008134974479*cos(14*M_PI*n/(N-1))+0.000624544650*cos(16*M_PI*n/(N-1))-
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0.000019808998*cos(18*M_PI*n/(N-1))+0.000000132974*cos(20*M_PI*n/(N-1));
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*overlap = 0.841;
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break;
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case WFUNC_BHARRIS:
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for (n = 0; n < N; n++)
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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));
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*overlap = 0.661;
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break;
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case WFUNC_BNUTTALL:
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for (n = 0; n < N; n++)
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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,
|
||||
};
|
||||
@ -30,7 +30,7 @@
|
||||
#include "libavutil/version.h"
|
||||
|
||||
#define LIBAVFILTER_VERSION_MAJOR 5
|
||||
#define LIBAVFILTER_VERSION_MINOR 34
|
||||
#define LIBAVFILTER_VERSION_MINOR 35
|
||||
#define LIBAVFILTER_VERSION_MICRO 100
|
||||
|
||||
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
|
||||
|
||||
@ -136,6 +136,25 @@ int av_audio_fifo_write(AVAudioFifo *af, void **data, int nb_samples)
|
||||
return nb_samples;
|
||||
}
|
||||
|
||||
int av_audio_fifo_peek(AVAudioFifo *af, void **data, int nb_samples)
|
||||
{
|
||||
int i, ret, size;
|
||||
|
||||
if (nb_samples < 0)
|
||||
return AVERROR(EINVAL);
|
||||
nb_samples = FFMIN(nb_samples, af->nb_samples);
|
||||
if (!nb_samples)
|
||||
return 0;
|
||||
|
||||
size = nb_samples * af->sample_size;
|
||||
for (i = 0; i < af->nb_buffers; i++) {
|
||||
if ((ret = av_fifo_generic_peek(af->buf[i], data[i], size, NULL)) < 0)
|
||||
return AVERROR_BUG;
|
||||
}
|
||||
|
||||
return nb_samples;
|
||||
}
|
||||
|
||||
int av_audio_fifo_read(AVAudioFifo *af, void **data, int nb_samples)
|
||||
{
|
||||
int i, ret, size;
|
||||
|
||||
@ -93,6 +93,22 @@ int av_audio_fifo_realloc(AVAudioFifo *af, int nb_samples);
|
||||
*/
|
||||
int av_audio_fifo_write(AVAudioFifo *af, void **data, int nb_samples);
|
||||
|
||||
/**
|
||||
* Peek data from an AVAudioFifo.
|
||||
*
|
||||
* @see enum AVSampleFormat
|
||||
* The documentation for AVSampleFormat describes the data layout.
|
||||
*
|
||||
* @param af AVAudioFifo to read from
|
||||
* @param data audio data plane pointers
|
||||
* @param nb_samples number of samples to peek
|
||||
* @return number of samples actually peek, or negative AVERROR code
|
||||
* on failure. The number of samples actually peek will not
|
||||
* be greater than nb_samples, and will only be less than
|
||||
* nb_samples if av_audio_fifo_size is less than nb_samples.
|
||||
*/
|
||||
int av_audio_fifo_peek(AVAudioFifo *af, void **data, int nb_samples);
|
||||
|
||||
/**
|
||||
* Read data from an AVAudioFifo.
|
||||
*
|
||||
|
||||
@ -148,6 +148,32 @@ int av_fifo_generic_write(AVFifoBuffer *f, void *src, int size,
|
||||
return total - size;
|
||||
}
|
||||
|
||||
int av_fifo_generic_peek(AVFifoBuffer *f, void *dest, int buf_size,
|
||||
void (*func)(void *, void *, int))
|
||||
{
|
||||
// Read memory barrier needed for SMP here in theory
|
||||
uint8_t *rptr = f->rptr;
|
||||
uint32_t rndx = f->rndx;
|
||||
|
||||
do {
|
||||
int len = FFMIN(f->end - f->rptr, buf_size);
|
||||
if (func)
|
||||
func(dest, f->rptr, len);
|
||||
else {
|
||||
memcpy(dest, f->rptr, len);
|
||||
dest = (uint8_t *)dest + len;
|
||||
}
|
||||
// memory barrier needed for SMP here in theory
|
||||
av_fifo_drain(f, len);
|
||||
buf_size -= len;
|
||||
} while (buf_size > 0);
|
||||
|
||||
f->rptr = rptr;
|
||||
f->rndx = rndx;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int av_fifo_generic_read(AVFifoBuffer *f, void *dest, int buf_size,
|
||||
void (*func)(void *, void *, int))
|
||||
{
|
||||
|
||||
@ -83,6 +83,16 @@ int av_fifo_size(const AVFifoBuffer *f);
|
||||
*/
|
||||
int av_fifo_space(const AVFifoBuffer *f);
|
||||
|
||||
/**
|
||||
* Feed data from an AVFifoBuffer to a user-supplied callback.
|
||||
* Similar as av_fifo_gereric_read but without discarding data.
|
||||
* @param f AVFifoBuffer to read from
|
||||
* @param buf_size number of bytes to read
|
||||
* @param func generic read function
|
||||
* @param dest data destination
|
||||
*/
|
||||
int av_fifo_generic_peek(AVFifoBuffer *f, void *dest, int buf_size, void (*func)(void*, void*, int));
|
||||
|
||||
/**
|
||||
* Feed data from an AVFifoBuffer to a user-supplied callback.
|
||||
* @param f AVFifoBuffer to read from
|
||||
|
||||
Loading…
Reference in New Issue
Block a user