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/* Copyright (C) 2014 J.F.Dockes
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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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*
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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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*
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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
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* Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "config.h"
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#include <string.h>
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#include "wav.h"
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inline int inttoichar4(unsigned char *cdb, unsigned int addr)
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{
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cdb[3] = (addr & 0xff000000) >> 24;
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cdb[2] = (addr & 0x00ff0000) >> 16;
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cdb[1] = (addr & 0x0000ff00) >> 8;
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cdb[0] = addr & 0x000000ff;
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return 4;
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}
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inline int inttoichar2(unsigned char *cdb, unsigned int cnt)
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{
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cdb[1] = (cnt & 0x0000ff00) >> 8;
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cdb[0] = cnt & 0x000000ff;
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return 2;
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}
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#if 0
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// For reference: definition of a wav header
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// Les valeurs en commentaires sont donnees pour du son 44100/16/2
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struct wav_header {
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/*0 */char riff[4]; /* = 'RIFF' */
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/*4 */int32 rifflen; /* longueur des infos qui suivent= datalen+36 */
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/*8 */char wave[4]; /* = 'WAVE' */
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/*12*/char fmt[4]; /* = 'fmt ' */
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/*16*/int32 fmtlen; /* = 16 */
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/*20*/int16 formtag; /* = 1 : PCM */
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/*22*/int16 nchan; /* = 2 : nombre de canaux */
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/*24*/int32 sampspersec; /* = 44100 : Nbr d'echantillons par seconde */
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/*28*/int32 avgbytpersec;/* = 176400 : Nbr moyen octets par seconde */
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/*32*/int16 blockalign; /* = 4 : nombre d'octets par echantillon */
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/*34*/int16 bitspersamp; /* = 16 : bits par echantillon */
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/*36*/char data[4]; /* = 'data' */
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/*40*/int32 datalen; /* Nombre d'octets de son qui suivent */
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/*44*/char data[];
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};
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#endif /* if 0 */
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#define WAVHSIZE 44
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#define RIFFTOWAVCNT 36
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// Format header. Note the use of intel format integers. Input buffer must
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// be of size >= 44
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int makewavheader(char *buf, int maxsize, int freq, int bits,
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int chans, unsigned int databytecnt)
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{
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if (maxsize < WAVHSIZE)
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return -1;
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unsigned char *cp = (unsigned char *)buf;
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memcpy(cp, "RIFF", 4);
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cp += 4;
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inttoichar4(cp, databytecnt + RIFFTOWAVCNT);
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cp += 4;
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memcpy(cp, "WAVE", 4);
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cp += 4;
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memcpy(cp, "fmt ", 4);
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cp += 4;
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inttoichar4(cp, 16);
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cp += 4;
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inttoichar2(cp, 1);
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cp += 2;
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inttoichar2(cp, chans);
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cp += 2;
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inttoichar4(cp, freq);
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cp += 4;
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inttoichar4(cp, freq * chans * (bits / 8));
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cp += 4;
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inttoichar2(cp, chans * bits / 8);
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cp += 2;
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inttoichar2(cp, bits);
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cp += 2;
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memcpy(cp, "data", 4);
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cp += 4;
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inttoichar4(cp, databytecnt);
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cp += 4;
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return WAVHSIZE;
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}
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