mirror of
https://github.com/FFmpeg/FFmpeg.git
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50ea7389ec
Lots of audio filters use very simple inputs or outputs: An array with a single AVFilterPad whose name is "default" and whose type is AVMEDIA_TYPE_AUDIO; everything else is unset. Given that we never use pointer equality for inputs or outputs*, we can simply use a single AVFilterPad instead of dozens; this even saves .data.rel.ro (4784B here) as well as relocations. *: In fact, several filters (like the filters in af_biquads.c) already use the same inputs; furthermore, ff_filter_alloc() duplicates the input and output pads so that we do not even work with the pads directly. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
455 lines
14 KiB
C
455 lines
14 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/avstring.h"
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#include "libavfilter/internal.h"
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#include "libavutil/common.h"
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#include "libavutil/cpu.h"
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#include "libavutil/opt.h"
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#include "libavutil/eval.h"
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#include "libavutil/tx.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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AVTXContext **fft, **ifft;
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av_tx_fn tx_fn, itx_fn;
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AVComplexFloat **fft_in;
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AVComplexFloat **fft_out;
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AVComplexFloat **fft_temp;
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int nb_exprs;
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int channels;
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int window_size;
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AVExpr **real;
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AVExpr **imag;
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int hop_size;
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float overlap;
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AVFrame *window;
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AVFrame *buffer;
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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_OPTION("win_func", OFFSET(win_func), A, WFUNC_HANNING),
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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_out[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_out[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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static double (*const 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, scale = 1.f;
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char *args;
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const char *last_expr = "1";
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int buf_size;
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s->channels = inlink->ch_layout.nb_channels;
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s->fft = av_calloc(s->channels, sizeof(*s->fft));
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s->ifft = av_calloc(s->channels, sizeof(*s->ifft));
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if (!s->fft || !s->ifft)
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return AVERROR(ENOMEM);
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for (int ch = 0; ch < s->channels; ch++) {
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ret = av_tx_init(&s->fft[ch], &s->tx_fn, AV_TX_FLOAT_FFT, 0, s->fft_size, &scale, 0);
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if (ret < 0)
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return ret;
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}
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for (int ch = 0; ch < s->channels; ch++) {
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ret = av_tx_init(&s->ifft[ch], &s->itx_fn, AV_TX_FLOAT_FFT, 1, s->fft_size, &scale, 0);
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if (ret < 0)
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return ret;
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}
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s->window_size = s->fft_size;
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buf_size = FFALIGN(s->window_size, av_cpu_max_align());
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s->fft_in = av_calloc(inlink->ch_layout.nb_channels, sizeof(*s->fft_in));
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if (!s->fft_in)
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return AVERROR(ENOMEM);
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s->fft_out = av_calloc(inlink->ch_layout.nb_channels, sizeof(*s->fft_out));
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if (!s->fft_out)
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return AVERROR(ENOMEM);
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s->fft_temp = av_calloc(inlink->ch_layout.nb_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->ch_layout.nb_channels; ch++) {
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s->fft_in[ch] = av_calloc(buf_size, sizeof(**s->fft_in));
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if (!s->fft_in[ch])
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return AVERROR(ENOMEM);
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s->fft_out[ch] = av_calloc(buf_size, sizeof(**s->fft_out));
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if (!s->fft_out[ch])
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return AVERROR(ENOMEM);
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s->fft_temp[ch] = av_calloc(buf_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->ch_layout.nb_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->ch_layout.nb_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->ch_layout.nb_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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goto fail;
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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_freep(&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->ch_layout.nb_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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goto fail;
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if (arg)
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last_expr = arg;
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}
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av_freep(&args);
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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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for (int i = 0; i < s->window_size; i++)
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s->window_func_lut[i] = sqrtf(s->window_func_lut[i] / s->window_size);
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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->window = ff_get_audio_buffer(inlink, s->window_size * 2);
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if (!s->window)
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return AVERROR(ENOMEM);
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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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fail:
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av_freep(&args);
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return ret;
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}
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static int tx_channel(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
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{
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AFFTFiltContext *s = ctx->priv;
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const int channels = s->channels;
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const int start = (channels * jobnr) / nb_jobs;
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const int end = (channels * (jobnr+1)) / nb_jobs;
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for (int ch = start; ch < end; ch++) {
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AVComplexFloat *fft_in = s->fft_in[ch];
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AVComplexFloat *fft_out = s->fft_out[ch];
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s->tx_fn(s->fft[ch], fft_out, fft_in, sizeof(*fft_in));
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}
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return 0;
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}
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static int filter_channel(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
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{
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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 *window_lut = s->window_func_lut;
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const float f = sqrtf(1.f - s->overlap);
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const int channels = s->channels;
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const int start = (channels * jobnr) / nb_jobs;
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const int end = (channels * (jobnr+1)) / nb_jobs;
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double values[VAR_VARS_NB];
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memcpy(values, arg, sizeof(values));
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for (int ch = start; ch < end; ch++) {
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AVComplexFloat *fft_out = s->fft_out[ch];
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AVComplexFloat *fft_temp = s->fft_temp[ch];
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float *buf = (float *)s->buffer->extended_data[ch];
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values[VAR_CHANNEL] = ch;
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if (ctx->is_disabled) {
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for (int n = 0; n < window_size; n++) {
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fft_temp[n].re = fft_out[n].re;
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fft_temp[n].im = fft_out[n].im;
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}
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} else {
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for (int 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_out[n].re;
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values[VAR_IMAG] = fft_out[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 (int 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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}
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s->itx_fn(s->ifft[ch], fft_out, fft_temp, sizeof(*fft_temp));
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memmove(buf, buf + s->hop_size, window_size * sizeof(float));
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for (int i = 0; i < window_size; i++)
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buf[i] += fft_out[i].re * window_lut[i] * f;
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}
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return 0;
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *in)
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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 *window_lut = s->window_func_lut;
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double values[VAR_VARS_NB];
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int ch, n, ret;
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AVFrame *out;
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for (ch = 0; ch < inlink->ch_layout.nb_channels; ch++) {
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const int offset = s->window_size - s->hop_size;
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float *src = (float *)s->window->extended_data[ch];
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AVComplexFloat *fft_in = s->fft_in[ch];
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memmove(src, &src[s->hop_size], offset * sizeof(float));
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memcpy(&src[offset], in->extended_data[ch], in->nb_samples * sizeof(float));
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memset(&src[offset + in->nb_samples], 0, (s->hop_size - in->nb_samples) * sizeof(float));
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for (n = 0; n < window_size; n++) {
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fft_in[n].re = src[n] * window_lut[n];
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fft_in[n].im = 0;
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}
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}
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values[VAR_PTS] = in->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->ch_layout.nb_channels;
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ff_filter_execute(ctx, tx_channel, NULL, NULL,
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FFMIN(s->channels, ff_filter_get_nb_threads(ctx)));
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ff_filter_execute(ctx, filter_channel, values, NULL,
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FFMIN(s->channels, ff_filter_get_nb_threads(ctx)));
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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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av_frame_copy_props(out, in);
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out->nb_samples = in->nb_samples;
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for (ch = 0; ch < inlink->ch_layout.nb_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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memcpy(dst, buf, s->hop_size * sizeof(float));
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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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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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ret = ff_inlink_consume_samples(inlink, s->hop_size, s->hop_size, &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 = filter_frame(inlink, in);
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if (ret < 0)
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return ret;
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if (ff_inlink_acknowledge_status(inlink, &status, &pts)) {
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ff_outlink_set_status(outlink, status, pts);
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return 0;
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}
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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 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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for (i = 0; i < s->channels; i++) {
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if (s->ifft)
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av_tx_uninit(&s->ifft[i]);
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if (s->fft)
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av_tx_uninit(&s->fft[i]);
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if (s->fft_in)
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av_freep(&s->fft_in[i]);
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if (s->fft_out)
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av_freep(&s->fft_out[i]);
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if (s->fft_temp)
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av_freep(&s->fft_temp[i]);
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}
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av_freep(&s->fft);
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av_freep(&s->ifft);
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av_freep(&s->fft_in);
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av_freep(&s->fft_out);
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av_freep(&s->fft_temp);
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for (i = 0; i < s->nb_exprs; i++) {
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av_expr_free(s->real[i]);
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av_expr_free(s->imag[i]);
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}
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av_freep(&s->real);
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av_freep(&s->imag);
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av_frame_free(&s->buffer);
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av_frame_free(&s->window);
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av_freep(&s->window_func_lut);
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}
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static const AVFilterPad inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_AUDIO,
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.config_props = config_input,
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},
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};
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const AVFilter ff_af_afftfilt = {
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.name = "afftfilt",
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.description = NULL_IF_CONFIG_SMALL("Apply arbitrary expressions to samples in frequency domain."),
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.priv_size = sizeof(AFFTFiltContext),
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.priv_class = &afftfilt_class,
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FILTER_INPUTS(inputs),
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FILTER_OUTPUTS(ff_audio_default_filterpad),
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FILTER_SINGLE_SAMPLEFMT(AV_SAMPLE_FMT_FLTP),
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.activate = activate,
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.uninit = uninit,
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL |
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AVFILTER_FLAG_SLICE_THREADS,
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};
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