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75b660551a
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@95 65c4cc65-6c06-0410-ace0-fbb531ad65f3
93 lines
2.4 KiB
C
Executable File
93 lines
2.4 KiB
C
Executable File
/*____________________________________________________________________________
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FreeAmp - The Free MP3 Player
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MP3 Decoder originally Copyright (C) 1995-1997 Xing Technology
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Corp. http://www.xingtech.com
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Portions Copyright (C) 1998 EMusic.com
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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$Id$
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____________________________________________________________________________*/
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/*---- wcvt.c --------------------------------------------
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conditional inclusion to wavep.c
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pcm conversion to wave format
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for big endians or when sizeof(short) > 16 bits
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mod 1/9/97 warnings
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-----------------------------------------------------------*/
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static int bytes_per_samp = 1;
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static int big_ender;
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static int cvt_flag;
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/*-------------------------------------------------------*/
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void cvt_to_wave_init(int bits)
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{
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big_ender = 1;
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if ((*(unsigned char *) &big_ender) == 1)
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big_ender = 0;
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/*--- printf("\n big_ender = %d", big_ender ); ---*/
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if (bits == 8)
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bytes_per_samp = 1;
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else
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bytes_per_samp = sizeof(short);
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cvt_flag = 0;
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if (bits > 8)
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{
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if (big_ender)
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cvt_flag = 1;
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cvt_flag |= (sizeof(short) > 2);
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}
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}
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/*-------------------------------------------------------*/
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unsigned int cvt_to_wave(unsigned char *pcm, unsigned int bytes_in)
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{
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unsigned int i, k;
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unsigned int nsamp;
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short tmp;
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unsigned short *w;
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// printf("\n wave convert");
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if (cvt_flag == 0)
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return bytes_in;
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/*-- no conversion required --*/
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nsamp = bytes_in / bytes_per_samp;
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w = (unsigned short *) pcm;
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for (i = 0, k = 0; i < nsamp; i++, k += 2)
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{
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tmp = w[i];
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pcm[k] = (unsigned char) tmp;
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pcm[k + 1] = (unsigned char) (tmp >> 8);
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}
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return (nsamp << 1);
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/*--- return bytes out ---*/
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}
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/*-------------------------------------------------------*/
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