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98 lines
2 KiB
C
98 lines
2 KiB
C
/* Resampling library
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* Copyright (C) <2001> David Schleef <ds@schleef.org>
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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 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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __GST_RESAMPLE_H__
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#define __GST_RESAMPLE_H__
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typedef enum
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{
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GST_RESAMPLE_NEAREST = 0,
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GST_RESAMPLE_BILINEAR,
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GST_RESAMPLE_SINC_SLOW,
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GST_RESAMPLE_SINC,
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} gst_resample_method;
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typedef enum
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{
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GST_RESAMPLE_S16 = 0,
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GST_RESAMPLE_FLOAT
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} gst_resample_format;
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typedef struct gst_resample_s gst_resample_t;
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struct gst_resample_s
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{
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/* parameters */
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gst_resample_method method;
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int channels;
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int verbose;
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gst_resample_format format;
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int filter_length;
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double i_rate;
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double o_rate;
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void *priv;
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void *(*get_buffer) (void *priv, unsigned int size);
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/* internal parameters */
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double halftaps;
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/* filter state */
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void *buffer;
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int buffer_len;
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double i_start;
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double o_start;
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double i_start_buf;
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double i_end_buf;
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double i_inc;
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double o_inc;
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double i_end;
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double o_end;
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int i_samples;
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int o_samples;
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void *i_buf, *o_buf;
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double acc[10];
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/* methods */
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void (*scale) (gst_resample_t * r);
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double ack;
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};
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void gst_resample_init (gst_resample_t * r);
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void gst_resample_reinit (gst_resample_t * r);
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void gst_resample_scale (gst_resample_t * r, void *i_buf, unsigned int size);
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#endif /* __GST_RESAMPLE_H__ */
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