485 lines
15 KiB
C
485 lines
15 KiB
C
/*
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* Copyright (c) 2016 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 modify it
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* under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1 of the License,
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* 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 "libavutil/audio_fifo.h"
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#include "libavutil/avstring.h"
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#include "libavfilter/internal.h"
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#include "libavutil/common.h"
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#include "libavutil/opt.h"
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#include "libavcodec/avfft.h"
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#include "libavutil/eval.h"
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#include "audio.h"
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#include "filters.h"
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#include "window_func.h"
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typedef struct AFFTFiltContext {
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const AVClass *class;
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char *real_str;
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char *img_str;
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int fft_size;
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int fft_bits;
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FFTContext *fft, *ifft;
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FFTComplex **fft_data;
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FFTComplex **fft_temp;
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int nb_exprs;
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int window_size;
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AVExpr **real;
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AVExpr **imag;
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AVAudioFifo *fifo;
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int64_t pts;
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int hop_size;
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float overlap;
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AVFrame *buffer;
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int eof;
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int win_func;
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float *window_func_lut;
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} AFFTFiltContext;
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static const char *const var_names[] = { "sr", "b", "nb", "ch", "chs", "pts", "re", "im", NULL };
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enum { VAR_SAMPLE_RATE, VAR_BIN, VAR_NBBINS, VAR_CHANNEL, VAR_CHANNELS, VAR_PTS, VAR_REAL, VAR_IMAG, VAR_VARS_NB };
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#define OFFSET(x) offsetof(AFFTFiltContext, x)
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#define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption afftfilt_options[] = {
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{ "real", "set channels real expressions", OFFSET(real_str), AV_OPT_TYPE_STRING, {.str = "re" }, 0, 0, A },
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{ "imag", "set channels imaginary expressions", OFFSET(img_str), AV_OPT_TYPE_STRING, {.str = "im" }, 0, 0, A },
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{ "win_size", "set window size", OFFSET(fft_size), AV_OPT_TYPE_INT, {.i64=4096}, 16, 131072, A },
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{ "win_func", "set window function", OFFSET(win_func), AV_OPT_TYPE_INT, {.i64 = WFUNC_HANNING}, 0, NB_WFUNC-1, A, "win_func" },
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{ "rect", "Rectangular", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_RECT}, 0, 0, A, "win_func" },
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{ "bartlett", "Bartlett", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BARTLETT}, 0, 0, A, "win_func" },
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{ "hann", "Hann", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HANNING}, 0, 0, A, "win_func" },
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{ "hanning", "Hanning", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HANNING}, 0, 0, A, "win_func" },
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{ "hamming", "Hamming", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HAMMING}, 0, 0, A, "win_func" },
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{ "blackman", "Blackman", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BLACKMAN}, 0, 0, A, "win_func" },
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{ "welch", "Welch", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_WELCH}, 0, 0, A, "win_func" },
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{ "flattop", "Flat-top", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_FLATTOP}, 0, 0, A, "win_func" },
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{ "bharris", "Blackman-Harris", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHARRIS}, 0, 0, A, "win_func" },
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{ "bnuttall", "Blackman-Nuttall", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BNUTTALL}, 0, 0, A, "win_func" },
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{ "bhann", "Bartlett-Hann", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHANN}, 0, 0, A, "win_func" },
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{ "sine", "Sine", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_SINE}, 0, 0, A, "win_func" },
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{ "nuttall", "Nuttall", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_NUTTALL}, 0, 0, A, "win_func" },
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{ "lanczos", "Lanczos", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_LANCZOS}, 0, 0, A, "win_func" },
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{ "gauss", "Gauss", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_GAUSS}, 0, 0, A, "win_func" },
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{ "tukey", "Tukey", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_TUKEY}, 0, 0, A, "win_func" },
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{ "dolph", "Dolph-Chebyshev", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_DOLPH}, 0, 0, A, "win_func" },
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{ "cauchy", "Cauchy", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_CAUCHY}, 0, 0, A, "win_func" },
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{ "parzen", "Parzen", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_PARZEN}, 0, 0, A, "win_func" },
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{ "poisson", "Poisson", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_POISSON}, 0, 0, A, "win_func" },
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{ "bohman", "Bohman", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BOHMAN}, 0, 0, A, "win_func" },
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{ "overlap", "set window overlap", OFFSET(overlap), AV_OPT_TYPE_FLOAT, {.dbl=0.75}, 0, 1, A },
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{ NULL },
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};
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AVFILTER_DEFINE_CLASS(afftfilt);
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static inline double getreal(void *priv, double x, double ch)
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{
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AFFTFiltContext *s = priv;
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int ich, ix;
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ich = av_clip(ch, 0, s->nb_exprs - 1);
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ix = av_clip(x, 0, s->window_size / 2);
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return s->fft_data[ich][ix].re;
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}
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static inline double getimag(void *priv, double x, double ch)
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{
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AFFTFiltContext *s = priv;
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int ich, ix;
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ich = av_clip(ch, 0, s->nb_exprs - 1);
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ix = av_clip(x, 0, s->window_size / 2);
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return s->fft_data[ich][ix].im;
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}
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static double realf(void *priv, double x, double ch) { return getreal(priv, x, ch); }
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static double imagf(void *priv, double x, double ch) { return getimag(priv, x, ch); }
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static const char *const func2_names[] = { "real", "imag", NULL };
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double (*func2[])(void *, double, double) = { realf, imagf, NULL };
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static int config_input(AVFilterLink *inlink)
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{
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AVFilterContext *ctx = inlink->dst;
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AFFTFiltContext *s = ctx->priv;
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char *saveptr = NULL;
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int ret = 0, ch;
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float overlap;
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char *args;
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const char *last_expr = "1";
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s->pts = AV_NOPTS_VALUE;
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s->fft_bits = av_log2(s->fft_size);
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s->fft = av_fft_init(s->fft_bits, 0);
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s->ifft = av_fft_init(s->fft_bits, 1);
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if (!s->fft || !s->ifft)
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return AVERROR(ENOMEM);
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s->window_size = 1 << s->fft_bits;
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s->fft_data = av_calloc(inlink->channels, sizeof(*s->fft_data));
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if (!s->fft_data)
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return AVERROR(ENOMEM);
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s->fft_temp = av_calloc(inlink->channels, sizeof(*s->fft_temp));
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if (!s->fft_temp)
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return AVERROR(ENOMEM);
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for (ch = 0; ch < inlink->channels; ch++) {
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s->fft_data[ch] = av_calloc(s->window_size, sizeof(**s->fft_data));
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if (!s->fft_data[ch])
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return AVERROR(ENOMEM);
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}
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for (ch = 0; ch < inlink->channels; ch++) {
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s->fft_temp[ch] = av_calloc(s->window_size, sizeof(**s->fft_temp));
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if (!s->fft_temp[ch])
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return AVERROR(ENOMEM);
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}
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s->real = av_calloc(inlink->channels, sizeof(*s->real));
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if (!s->real)
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return AVERROR(ENOMEM);
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s->imag = av_calloc(inlink->channels, sizeof(*s->imag));
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if (!s->imag)
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return AVERROR(ENOMEM);
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args = av_strdup(s->real_str);
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if (!args)
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return AVERROR(ENOMEM);
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for (ch = 0; ch < inlink->channels; ch++) {
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char *arg = av_strtok(ch == 0 ? args : NULL, "|", &saveptr);
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ret = av_expr_parse(&s->real[ch], arg ? arg : last_expr, var_names,
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NULL, NULL, func2_names, func2, 0, ctx);
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if (ret < 0)
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break;
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if (arg)
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last_expr = arg;
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s->nb_exprs++;
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}
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av_free(args);
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args = av_strdup(s->img_str ? s->img_str : s->real_str);
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if (!args)
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return AVERROR(ENOMEM);
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saveptr = NULL;
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last_expr = "1";
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for (ch = 0; ch < inlink->channels; ch++) {
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char *arg = av_strtok(ch == 0 ? args : NULL, "|", &saveptr);
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ret = av_expr_parse(&s->imag[ch], arg ? arg : last_expr, var_names,
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NULL, NULL, func2_names, func2, 0, ctx);
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if (ret < 0)
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break;
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if (arg)
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last_expr = arg;
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}
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av_free(args);
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s->fifo = av_audio_fifo_alloc(inlink->format, inlink->channels, s->window_size);
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if (!s->fifo)
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return AVERROR(ENOMEM);
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s->window_func_lut = av_realloc_f(s->window_func_lut, s->window_size,
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sizeof(*s->window_func_lut));
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if (!s->window_func_lut)
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return AVERROR(ENOMEM);
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generate_window_func(s->window_func_lut, s->window_size, s->win_func, &overlap);
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if (s->overlap == 1)
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s->overlap = overlap;
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s->hop_size = s->window_size * (1 - s->overlap);
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if (s->hop_size <= 0)
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return AVERROR(EINVAL);
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s->buffer = ff_get_audio_buffer(inlink, s->window_size * 2);
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if (!s->buffer)
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return AVERROR(ENOMEM);
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return ret;
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}
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static int filter_frame(AVFilterLink *inlink)
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{
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AVFilterContext *ctx = inlink->dst;
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AVFilterLink *outlink = ctx->outputs[0];
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AFFTFiltContext *s = ctx->priv;
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const int window_size = s->window_size;
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const float f = 1. / (s->window_size / 2);
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double values[VAR_VARS_NB];
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AVFrame *out, *in = NULL;
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int ch, n, ret, i;
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if (!in) {
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in = ff_get_audio_buffer(outlink, window_size);
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if (!in)
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return AVERROR(ENOMEM);
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}
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ret = av_audio_fifo_peek(s->fifo, (void **)in->extended_data, window_size);
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if (ret < 0)
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goto fail;
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for (ch = 0; ch < inlink->channels; ch++) {
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const float *src = (float *)in->extended_data[ch];
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FFTComplex *fft_data = s->fft_data[ch];
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for (n = 0; n < in->nb_samples; n++) {
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fft_data[n].re = src[n] * s->window_func_lut[n];
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fft_data[n].im = 0;
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}
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for (; n < window_size; n++) {
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fft_data[n].re = 0;
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fft_data[n].im = 0;
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}
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}
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values[VAR_PTS] = s->pts;
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values[VAR_SAMPLE_RATE] = inlink->sample_rate;
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values[VAR_NBBINS] = window_size / 2;
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values[VAR_CHANNELS] = inlink->channels;
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for (ch = 0; ch < inlink->channels; ch++) {
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FFTComplex *fft_data = s->fft_data[ch];
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av_fft_permute(s->fft, fft_data);
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av_fft_calc(s->fft, fft_data);
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}
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for (ch = 0; ch < inlink->channels; ch++) {
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FFTComplex *fft_data = s->fft_data[ch];
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FFTComplex *fft_temp = s->fft_temp[ch];
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float *buf = (float *)s->buffer->extended_data[ch];
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int x;
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values[VAR_CHANNEL] = ch;
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for (n = 0; n <= window_size / 2; n++) {
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float fr, fi;
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values[VAR_BIN] = n;
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values[VAR_REAL] = fft_data[n].re;
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values[VAR_IMAG] = fft_data[n].im;
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fr = av_expr_eval(s->real[ch], values, s);
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fi = av_expr_eval(s->imag[ch], values, s);
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fft_temp[n].re = fr;
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fft_temp[n].im = fi;
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}
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for (n = window_size / 2 + 1, x = window_size / 2 - 1; n < window_size; n++, x--) {
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fft_temp[n].re = fft_temp[x].re;
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fft_temp[n].im = -fft_temp[x].im;
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}
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av_fft_permute(s->ifft, fft_temp);
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av_fft_calc(s->ifft, fft_temp);
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for (i = 0; i < window_size; i++) {
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buf[i] += s->fft_temp[ch][i].re * f;
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}
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}
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out = ff_get_audio_buffer(outlink, s->hop_size);
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if (!out) {
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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out->pts = s->pts;
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s->pts += av_rescale_q(s->hop_size, (AVRational){1, outlink->sample_rate}, outlink->time_base);
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for (ch = 0; ch < inlink->channels; ch++) {
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float *dst = (float *)out->extended_data[ch];
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float *buf = (float *)s->buffer->extended_data[ch];
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for (n = 0; n < s->hop_size; n++)
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dst[n] = buf[n] * (1.f - s->overlap);
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memmove(buf, buf + s->hop_size, window_size * 4);
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}
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ret = ff_filter_frame(outlink, out);
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if (ret < 0)
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goto fail;
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av_audio_fifo_drain(s->fifo, s->hop_size);
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fail:
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av_frame_free(&in);
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return ret < 0 ? ret : 0;
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}
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static int activate(AVFilterContext *ctx)
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{
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AVFilterLink *inlink = ctx->inputs[0];
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AVFilterLink *outlink = ctx->outputs[0];
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AFFTFiltContext *s = ctx->priv;
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AVFrame *in = NULL;
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int ret = 0, status;
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int64_t pts;
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FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
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if (!s->eof && av_audio_fifo_size(s->fifo) < s->window_size) {
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ret = ff_inlink_consume_frame(inlink, &in);
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if (ret < 0)
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return ret;
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if (ret > 0) {
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ret = av_audio_fifo_write(s->fifo, (void **)in->extended_data,
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in->nb_samples);
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if (ret >= 0 && s->pts == AV_NOPTS_VALUE)
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s->pts = in->pts;
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av_frame_free(&in);
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if (ret < 0)
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return ret;
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}
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}
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if ((av_audio_fifo_size(s->fifo) >= s->window_size) ||
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(av_audio_fifo_size(s->fifo) > 0 && s->eof)) {
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ret = filter_frame(inlink);
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if (av_audio_fifo_size(s->fifo) >= s->window_size)
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ff_filter_set_ready(ctx, 100);
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return ret;
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}
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if (!s->eof && ff_inlink_acknowledge_status(inlink, &status, &pts)) {
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if (status == AVERROR_EOF) {
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s->eof = 1;
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if (av_audio_fifo_size(s->fifo) >= 0) {
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ff_filter_set_ready(ctx, 100);
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return 0;
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}
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}
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}
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if (s->eof && av_audio_fifo_size(s->fifo) <= 0) {
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ff_outlink_set_status(outlink, AVERROR_EOF, s->pts);
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return 0;
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}
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if (!s->eof)
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FF_FILTER_FORWARD_WANTED(outlink, inlink);
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return FFERROR_NOT_READY;
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}
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static int query_formats(AVFilterContext *ctx)
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{
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AVFilterFormats *formats;
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AVFilterChannelLayouts *layouts;
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static const enum AVSampleFormat sample_fmts[] = {
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AV_SAMPLE_FMT_FLTP,
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AV_SAMPLE_FMT_NONE
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};
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int ret;
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layouts = ff_all_channel_counts();
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if (!layouts)
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return AVERROR(ENOMEM);
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ret = ff_set_common_channel_layouts(ctx, layouts);
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if (ret < 0)
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return ret;
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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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ret = ff_set_common_formats(ctx, formats);
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if (ret < 0)
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return ret;
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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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return ff_set_common_samplerates(ctx, formats);
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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AFFTFiltContext *s = ctx->priv;
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int i;
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av_fft_end(s->fft);
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av_fft_end(s->ifft);
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for (i = 0; i < s->nb_exprs; i++) {
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if (s->fft_data)
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av_freep(&s->fft_data[i]);
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if (s->fft_temp)
|
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av_freep(&s->fft_temp[i]);
|
|
}
|
|
av_freep(&s->fft_data);
|
|
av_freep(&s->fft_temp);
|
|
|
|
for (i = 0; i < s->nb_exprs; i++) {
|
|
av_expr_free(s->real[i]);
|
|
av_expr_free(s->imag[i]);
|
|
}
|
|
|
|
av_freep(&s->real);
|
|
av_freep(&s->imag);
|
|
av_frame_free(&s->buffer);
|
|
av_freep(&s->window_func_lut);
|
|
|
|
av_audio_fifo_free(s->fifo);
|
|
}
|
|
|
|
static const AVFilterPad inputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
.config_props = config_input,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
static const AVFilterPad outputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
AVFilter ff_af_afftfilt = {
|
|
.name = "afftfilt",
|
|
.description = NULL_IF_CONFIG_SMALL("Apply arbitrary expressions to samples in frequency domain."),
|
|
.priv_size = sizeof(AFFTFiltContext),
|
|
.priv_class = &afftfilt_class,
|
|
.inputs = inputs,
|
|
.outputs = outputs,
|
|
.activate = activate,
|
|
.query_formats = query_formats,
|
|
.uninit = uninit,
|
|
};
|