gstreamer/subprojects/gst-plugins-base/gst-libs/gst/audio/audio-resampler-private.h

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/* GStreamer
* Copyright (C) <2015> Wim Taymans <wim.taymans@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef __GST_AUDIO_RESAMPLER_PRIVATE_H__
#define __GST_AUDIO_RESAMPLER_PRIVATE_H__
#include "audio-resampler.h"
/* Contains a collection of all things found in other resamplers:
* speex (filter construction, optimizations), ffmpeg (fixed phase filter, blackman filter),
* SRC (linear interpolation, fixed precomputed tables),...
*
* Supports:
* - S16, S32, F32 and F64 formats
* - nearest, linear and cubic interpolation
* - sinc based interpolation with kaiser or blackman-nutall windows
* - fully configurable kaiser parameters
* - dynamic linear or cubic interpolation of filter table, this can
* use less memory but more CPU
* - full filter table, generated from optionally linear or cubic
* interpolation of filter table
* - fixed filter table size with nearest neighbour phase, optionally
* using a precomputed tables
* - dynamic samplerate changes
* - x86 and neon optimizations
*/
typedef void (*ConvertTapsFunc) (gdouble * tmp_taps, gpointer taps,
gdouble weight, gint n_taps);
typedef void (*InterpolateFunc) (gpointer o, const gpointer a, gint len,
const gpointer icoeff, gint astride);
typedef void (*ResampleFunc) (GstAudioResampler * resampler, gpointer in[],
gsize in_len, gpointer out[], gsize out_len, gsize * consumed);
typedef void (*DeinterleaveFunc) (GstAudioResampler * resampler,
gpointer * sbuf, gpointer in[], gsize in_frames);
struct _GstAudioResampler
{
GstAudioResamplerMethod method;
GstAudioResamplerFlags flags;
GstAudioFormat format;
GstStructure *options;
gint format_index;
gint channels;
gint in_rate;
gint out_rate;
gint bps;
gint ostride;
GstAudioResamplerFilterMode filter_mode;
guint filter_threshold;
GstAudioResamplerFilterInterpolation filter_interpolation;
gdouble cutoff;
gdouble kaiser_beta;
/* for cubic */
gdouble b, c;
/* temp taps */
gpointer tmp_taps;
/* oversampled main filter table */
gint oversample;
gint n_taps;
gpointer taps;
gpointer taps_mem;
gsize taps_stride;
gint n_phases;
gint alloc_taps;
gint alloc_phases;
/* cached taps */
gpointer *cached_phases;
gpointer cached_taps;
gpointer cached_taps_mem;
gsize cached_taps_stride;
ConvertTapsFunc convert_taps;
InterpolateFunc interpolate;
DeinterleaveFunc deinterleave;
ResampleFunc resample;
gint blocks;
gint inc;
gint samp_inc;
gint samp_frac;
gint samp_index;
gint samp_phase;
gint skip;
gpointer samples;
gsize samples_len;
gsize samples_avail;
gpointer *sbuf;
};
#endif /* __GST_AUDIO_RESAMPLER_PRIVATE_H__ */