avfilter: add arbitrary audio FIR filter

Signed-off-by: Paul B Mahol <onemda@gmail.com>

1 files changed, 83 insertions, 0 deletions

diff --git a/libavfilter/af_afir.h b/libavfilter/af_afir.h
new file mode 100644
index 0000000000..7414f5438e
--- /dev/null
+++ b/libavfilter/af_afir.h
@@ -0,0 +1,83 @@
+/*
+ * Copyright (c) 2017 Paul B Mahol
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef  AVFILTER_AFIR_H
+#define  AVFILTER_AFIR_H
+
+#include "libavutil/audio_fifo.h"
+#include "libavutil/common.h"
+#include "libavutil/float_dsp.h"
+#include "libavutil/opt.h"
+#include "libavcodec/avfft.h"
+
+#include "audio.h"
+#include "avfilter.h"
+#include "formats.h"
+#include "internal.h"
+
+#define MAX_IR_DURATION 30
+
+typedef struct AudioFIRContext {
+    const AVClass *class;
+
+    float wet_gain;
+    float dry_gain;
+    float length;
+    int again;
+
+    float gain;
+
+    int eof_coeffs;
+    int have_coeffs;
+    int nb_coeffs;
+    int nb_taps;
+    int part_size;
+    int part_index;
+    int coeff_size;
+    int block_size;
+    int nb_partitions;
+    int nb_channels;
+    int ir_length;
+    int fft_length;
+    int nb_coef_channels;
+    int one2many;
+    int nb_samples;
+    int want_skip;
+    int need_padding;
+
+    RDFTContext **rdft, **irdft;
+    float **sum;
+    float **block;
+    FFTComplex **coeff;
+
+    AVAudioFifo *fifo[2];
+    AVFrame *in[2];
+    AVFrame *buffer;
+    int64_t pts;
+    int index;
+
+    AVFloatDSPContext *fdsp;
+    void (*fcmul_add)(float *sum, const float *t, const float *c,
+                      ptrdiff_t len);
+} AudioFIRContext;
+
+void ff_afir_init_x86(AudioFIRContext *s);
+
+#endif /* AVFILTER_AFIR_H */