vorbis-tools/ogg123/vgfilter.h

   1 /*
   2  * vgfilter.h (c) 2007,2008 William Poetra Yoga Hadisoeseno
   3  * based on:
   4  * vgplay.h 1.0 (c) 2003 John Morton
   5 */
   6
   7 /* vgplay.h 1.0 (c) 2003 John Morton
   8  *
   9  * Portions of this file are (C) COPYRIGHT 1994-2002 by
  10  * the XIPHOPHORUS Company http://www.xiph.org/
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  *
  16  * - Redistributions of source code must retain the above copyright
  17  * notice, this list of conditions and the following disclaimer.
  18  *
  19  * - Redistributions in binary form must reproduce the above copyright
  20  * notice, this list of conditions and the following disclaimer in the
  21  * documentation and/or other materials provided with the
  22  * distribution.
  23  *
  24  * - Neither the name of the Xiph.org Foundation nor the names of its
  25  * contributors may be used to endorse or promote products derived
  26  * from this software without specific prior written permission.
  27  *
  28  *
  29  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  30  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  31  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  32  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  33  * REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  34  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  35  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  36  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  37  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  38  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  39  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  40  * OF THE POSSIBILITY OF SUCH DAMAGE.
  41  *
  42  **********************************************************************
  43  *
  44  * vgfilter - a filter for ov_read_filter to enable replay gain.
  45  *
  46  */
  47
  48
  49 #ifndef __VGPLAY_H
  50 #define __VGPLAY_H
  51
  52 /* Default pre-amp in dB */
  53 #define VG_PREAMP_DB         0.0
  54
  55 typedef struct {
  56   float scale_factor;  /* The scale factor */
  57   float max_scale;     /* The maximum scale factor before clipping occurs */
  58 } vgain_state;
  59
  60
  61 /* Initializes the ReplayGain the vgain_state structure for a track. */
  62 extern void vg_init(vgain_state *vg_state, vorbis_comment *vc);
  63
  64 /* The filter where VorbisGain is applied */
  65 extern void vg_filter(float **pcm, long channels, long samples, void *filter_param);
  66
  67 #endif /* __VGPLAY_H */