mffm.rar_WAV 读写_读写 wav 文件

/* Copyright 2001 Matt Flax <flatmax@ieee.org> This file is part of MFFM Time Scale Modification for Audio. MFFM Time Scale Modification for Audio is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. MFFM Time Scale Modification for Audio is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. A copy of the GPL license is available here : http://www.gnu.org/licenses/licenses.html#GPL http://www.gnu.org/licenses/gpl.html */ /* Version 1.2 */ #ifndef LIBSNDFILEWRAPPER_H_ #define LIBSNDFILEWRAPPER_H_ /* C++ Wrapper for the libsndfile library http://www.zip.com.au/~erikd/libsndfile/ Author: Matt Flax <flatmax@ieee.org> */ #include <sndfile.h> #include <string.h> //#define DEBUG_LSFW #ifdef DEBUG_LSFW #include <iostream> #endif /** Opens a file for reading, on failure returns NULL */ SNDFILE* openAudioRead(const char *name, SF_INFO *sfinfo){ sfinfo->format=0; SNDFILE *file=sf_open(name, SFM_READ,sfinfo); if (file==NULL){ perror("couldn't open input file\n"); sf_perror(file); return NULL; } return file; } /** Opens a WAV file for writing, on failure returns NULL */ SNDFILE* openWavWrite(SF_INFO *sfInfo, const char *name, int freq, int channelCnt, int bitCnt){ printf("libSndFileWrapper::openWavWrite : opening %s\n %dHz\t%d channel(s)\t%d bits per word\n", name, freq, channelCnt, bitCnt); sfInfo->samplerate=freq; sfInfo->channels=channelCnt; /* sfInfo->pcmbitwidth=bitCnt; from version 0*/ switch (bitCnt){ case 8: sfInfo->format=(SF_FORMAT_WAV | SF_FORMAT_PCM_S8); case 16: sfInfo->format=(SF_FORMAT_WAV | SF_FORMAT_PCM_16); case 24: sfInfo->format=(SF_FORMAT_WAV | SF_FORMAT_PCM_24); case 32: sfInfo->format=(SF_FORMAT_WAV | SF_FORMAT_PCM_32); default: sfInfo->format=(SF_FORMAT_WAV | SF_FORMAT_PCM_16); } return sf_open(name, SFM_WRITE, sfInfo); } /** Opens an AIFF sound file for writing, on failure returns NULL */ SNDFILE* openAiffWrite(SF_INFO *sfInfo, const char *name, int freq, int channelCnt, int bitCnt){ printf("libSndFileWrapper::openAiffWrite : opening %s\n %dHz\t%d channel(s)\t%d bits per word\n", name, freq, channelCnt, bitCnt); sfInfo->samplerate=freq; sfInfo->channels=channelCnt; switch (bitCnt){ case 8: sfInfo->format=(SF_FORMAT_AIFF | SF_FORMAT_PCM_S8); case 16: sfInfo->format=(SF_FORMAT_AIFF | SF_FORMAT_PCM_16); case 24: sfInfo->format=(SF_FORMAT_AIFF | SF_FORMAT_PCM_24); case 32: sfInfo->format=(SF_FORMAT_AIFF | SF_FORMAT_PCM_32); default: sfInfo->format=(SF_FORMAT_AIFF | SF_FORMAT_PCM_16); } return sf_open(name, SFM_WRITE, sfInfo); } /**Closes a sound file*/ void closeSndFile(SNDFILE* file){ sf_close(file); } /** writes N samples to file returns number written */ int writeNSndFile(SNDFILE *file, int N, short int *output){ int written; #ifdef DEBUG_LSFW printf("about to write : %d\n",N); #endif /*sfInfo->samples+=N;*/ written=sf_write_short(file, output, N); #ifdef DEBUG_LSFW printf("written : %d\n",written); #endif return written; } /** writes an entire wav file */ void writeWav(const char *name, int cnt, short int *output, int freq, int channelCnt, int bitCnt){ /*Write out to file ...*/ int written; SF_INFO sfInfo; memset(&sfInfo, 0, sizeof (sfInfo)) ; SNDFILE *file=openWavWrite(&sfInfo, name, freq, channelCnt, bitCnt); if (file==NULL){ perror("couldn't open output file\n"); sf_perror(file); exit(-1); } sfInfo.frames=cnt; #ifdef DEBUG_LSFW printf("about to write : %d\n",cnt); #endif written=sf_write_short(file, output, channelCnt*cnt); /* printf("written : %d\n",written);*/ #ifdef DEBUG_LSFW printf("written : %d\n",written); #endif closeSndFile(file); } /** Read N (cnt) units from the WAV file to a supplied array, returns the number read. */ int readNWav(int start, int cnt, int channels, SNDFILE *file, short int* input){ /*Read from file ...*/ int readn; if (file==NULL){ perror("supplied input file handle is NULL\n"); sf_perror(file); exit(-1); } //locate to the correct file location if (sf_seek (file, start, SEEK_SET)<0){ perror("seek error. Tried to seek to loction "); sf_perror(file); return -1; } #ifdef DEBUG_LSFW printf("about to read N= %d\n",cnt); #endif readn=sf_read_short(file, input, cnt*channels) ; #ifdef DEBUG_LSFW printf("read : %d\n",readn); #endif return readn/channels; } /** Read an entire WAV file, allocating the memory array returned. You must de-allocate yourself. */ short int* readWav(const char *name, int *cnt, int *freq, int *channels){ /*Read from file ...*/ short int *input; int readn; SF_INFO sfinfo; sfinfo.format=0; SNDFILE *file=sf_open(name, SFM_READ,&sfinfo); if (file==NULL){ perror("couldn't open input file\n"); sf_perror(file); exit(-1); } *cnt=sfinfo.frames; *freq=sfinfo.samplerate; *channels=sfinfo.channels; input=(short int *)malloc(sizeof(short int)*(*cnt)*(*channels)); if (!input){ perror("readWav:: input malloc error - out of memory ?"); printf("\t requested %d bytes",sizeof(short int)*(*cnt)*(*channels)); exit(-1); } #ifdef DEBUG_LSFW printf("about to read : %d\n",*cnt); #endif readn=sf_read_short(file, input, (*cnt)*(*channels)) ; #ifdef DEBUG_LSFW printf("read : %d\n",readn); #endif closeSndFile(file); return input; } #endif /*LIBSNDFILEWRAPPER_H_*/