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454 lines
14 KiB
454 lines
14 KiB
/* |
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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 "libavutil/mem.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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