apps/tdspeed.h

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2006 by Nicolas Pitre <nico@cam.org>
  11  * Copyright (C) 2006-2007 by Stéphane Doyon <s.doyon@videotron.ca>
  12  *
  13  * This program is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU General Public License
  15  * as published by the Free Software Foundation; either version 2
  16  * of the License, or (at your option) any later version.
  17  *
  18  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  19  * KIND, either express or implied.
  20  *
  21  ****************************************************************************/
  22
  23 #ifndef _TDSPEED_H
  24 #define _TDSPEED_H
  25
  26 #include "dsp.h"
  27
  28 #define TDSPEED_OUTBUFSIZE 4096
  29
  30 /* some #define functions to get the pitch, stretch and speed values based on */
  31 /* two known values.  Remember that params are alphabetical.                  */
  32 #define GET_SPEED(pitch, stretch) \
  33     ((pitch * stretch + PITCH_SPEED_100 / 2L) / PITCH_SPEED_100)
  34 #define GET_PITCH(speed, stretch) \
  35     ((speed * PITCH_SPEED_100 + stretch / 2L) / stretch)
  36 #define GET_STRETCH(pitch, speed) \
  37     ((speed * PITCH_SPEED_100 + pitch   / 2L) / pitch)
  38
  39 void tdspeed_init(void) INIT_ATTR;
  40 bool tdspeed_config(int samplerate, bool stereo, int32_t factor);
  41 long tdspeed_est_output_size(void);
  42 long tdspeed_est_input_size(long size);
  43 int tdspeed_doit(int32_t *src[], int count);
  44
  45 #define STRETCH_MAX (250L * PITCH_SPEED_PRECISION) /* 250% */
  46 #define STRETCH_MIN (35L  * PITCH_SPEED_PRECISION) /* 35%  */
  47
  48 #endif