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