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Open Sound System
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audio/audiocnv.inc

Helper functions used by audiofmt.c

Description

This file is part of Open Sound System.

Copyright (C) 4Front Technologies 1996-2008.

This this source file is released under GPL v2 license (no other versions). See the COPYING file included in the main directory of this source distribution for the license terms and conditions. 


/*ARGSUSED*/
static int
cnv_F8bits_T16bits (adev_p adev, dmap_p dmap, unsigned char **srcp, int *srcl,
		    unsigned char **tgtp, sample_parms * source, sample_parms * target)
{
  unsigned char *p1 = *srcp;
  short *p2 = (short*)*tgtp;
  int len = *srcl;
  int i, l;

  VMEM_CHECK (p1, len);
  VMEM_CHECK (p2, len * 2 / 1);

  l = len / 1;
  for (i = 0; i < l; i++)
    p2[i] = ((int) p1[i] - 128) << 8;

  *srcl = len * 2 / 1;
  *srcp = (unsigned char*)p2;
  *tgtp = p1;

  return 0;
}

/*ARGSUSED*/
static int
cnv_F8bits_T32bits (adev_p adev, dmap_p dmap, unsigned char **srcp, int *srcl,
		    unsigned char **tgtp, sample_parms * source, sample_parms * target)
{
  unsigned char *p1 = *srcp;
  int *p2 = (int *)*tgtp;
  int len = *srcl;
  int i, l;

  VMEM_CHECK (p1, len);
  VMEM_CHECK (p2, len * 4 / 1);

  l = len / 1;
  for (i = 0; i < l; i++)
    p2[i] = ((int) p1[i] - 128) << 24;

  *srcl = len * 4 / 1;
  *srcp = (unsigned char *)p2;
  *tgtp = p1;

  return 0;
}

/*ARGSUSED*/
static int
cnv_F16bits_T8bits (adev_p adev, dmap_p dmap, unsigned char **srcp, int *srcl,
		    unsigned char **tgtp, sample_parms * source, sample_parms * target)
{
  short *p1 = (short*)*srcp;
  unsigned char *p2 = *tgtp;
  int len = *srcl;
  int i, l;

  VMEM_CHECK (p1, len);
  VMEM_CHECK (p2, len * 1 / 2);

  l = len / 2;
  for (i = 0; i < l; i++)
    p2[i] = (((int) p1[i]) >> 8) + 128;

  *srcl = len * 1 / 2;
  *srcp = (unsigned char *)p2;
  *tgtp = (unsigned char *)p1;

  return 0;
}

/*ARGSUSED*/
static int
cnv_F16bits_T32bits (adev_p adev, dmap_p dmap, unsigned char **srcp, int *srcl,
		     unsigned char **tgtp, sample_parms * source,
		     sample_parms * target)
{
  short *p1 = (short *)*srcp;
  int *p2 = (int *)*tgtp;
  int len = *srcl;
  int i, l;

  VMEM_CHECK (p1, len);
  VMEM_CHECK (p2, len * 4 / 2);

  l = len / 2;
  for (i = 0; i < l; i++)
    p2[i] = ((int) p1[i]) << 16;

  *srcl = len * 4 / 2;
  *srcp = (unsigned char *)p2;
  *tgtp = (unsigned char *)p1;

  return 0;
}

/*ARGSUSED*/
static int
cnv_F32bits_T8bits (adev_p adev, dmap_p dmap, unsigned char **srcp, int *srcl,
		    unsigned char **tgtp, sample_parms * source, sample_parms * target)
{
  int *p1 = (int*)*srcp;
  unsigned char *p2 = *tgtp;
  int len = *srcl;
  int i, l;

  VMEM_CHECK (p1, len);
  VMEM_CHECK (p2, len * 1 / 4);

  l = len / 4;
  for (i = 0; i < l; i++)
    p2[i] = (((int) p1[i]) >> 24) + 128;

  *srcl = len * 1 / 4;
  *srcp = p2;
  *tgtp = (unsigned char *)p1;

  return 0;
}

/*ARGSUSED*/
static int
cnv_F32bits_T16bits (adev_p adev, dmap_p dmap, unsigned char **srcp, int *srcl,
		     unsigned char **tgtp, sample_parms * source,
		     sample_parms * target)
{
  int *p1 = (int *)*srcp;
  short *p2 = (short *)*tgtp;
  int len = *srcl;
  int i, l;

  VMEM_CHECK (p1, len);
  VMEM_CHECK (p2, len * 2 / 4);

  l = len / 4;
  for (i = 0; i < l; i++)
    p2[i] = (((int) p1[i]) >> 16);

  *srcl = len * 2 / 4;
  *srcp = (unsigned char *)p2;
  *tgtp = (unsigned char *)p1;

  return 0;
}
Copyright (C) 4Front Technologies, 2007. All rights reserved.

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Copyright (C) 4Front Technologies, 2007. All rights reserved.
Back to index OSS web site