最近在做一款变声App，其中就用到了将pcm格式转wave格式，下面贴出源代码，希望带有需求的童鞋有帮助！！！这里是c++语言写的，也可以用java实现。当然java调用native函数要用到jni技术。具体jni技术自己到网路上找找资料。
Cpp文件Pcm2Wave.cpp
#include <stdlib.h>#include <string.h>#include <stdio.h>#include "wave.h"#include "constant.h"class Pcm2Wave{private: WAVE_HEAD wave_head;FILE* src_pcm_file;FILE* dest_wave_file;public:Pcm2Wave(){ memcpy(&wave_head.riff_char, "RIFF", 4);memcpy(&wave_head.wave, "WAVE", 4);memcpy(&wave_head.fmt, "fmt ", 4);memcpy(&wave_head.fccID, "fact", 4);memcpy(&wave_head.data_field, "data", 4);wave_head.package_len = 0;wave_head.format_len = 16;wave_head.fixed = 1;wave_head.channel_number = 1;// 采样率 long int samplespersecwave_head.sample_rate = 8000 ;// 量化数 int bitpersamples=8或16wave_head.bits_per_sample = 16;// 采样一次占字节数 int blockaligwave_head.byte_per_sample = wave_head.channel_number * wave_head.bits_per_sample / 8; //NumChannels * BitsPerSample/8// 每秒播放字节数 long int bytepersecwave_head.byte_rate =wave_head.sample_rate * wave_head.channel_number * wave_head.bits_per_sample / 8; //SampleRate * NumChannels * BitsPerSample /8 wave_head.id = 4;wave_head.dwSize = 0;wave_head.data_len = 0;}Pcm2Wave(WAVE_HEAD* pwave_head){if(pwave_head != NULL){memcpy(&wave_head, pwave_head, sizeof(*pwave_head));}}~Pcm2Wave(){}void set_channel(short pchannel_number){wave_head.channel_number = pchannel_number;wave_head.byte_per_sample = wave_head.channel_number * wave_head.bits_per_sample / 8;wave_head.byte_rate =wave_head.sample_rate * wave_head.channel_number * wave_head.bits_per_sample / 8;}void set_sample_rate(int psample_rate){wave_head.sample_rate = psample_rate;wave_head.byte_rate =wave_head.sample_rate * wave_head.channel_number * wave_head.bits_per_sample / 8;}void set_bits_per_sample(short pbits_per_sample){wave_head.bits_per_sample = pbits_per_sample;wave_head.byte_per_sample = wave_head.channel_number * wave_head.bits_per_sample / 8;wave_head.byte_rate =wave_head.sample_rate * wave_head.channel_number * wave_head.bits_per_sample / 8;}int change(const char *srcfile, const char *dsetfile){int nFileLen = 0;int nSize = sizeof(wave_head);printf("wave的头的大小： %d\n", nSize);src_pcm_file = NULL;dest_wave_file = NULL;src_pcm_file = fopen(srcfile, "rb");if (src_pcm_file == NULL)return -1;dest_wave_file = fopen(dsetfile, "wb+");if (dest_wave_file == NULL)return -2;int nWrite = fwrite(&wave_head, 1, nSize, dest_wave_file);if (nWrite != nSize){fclose(src_pcm_file);fclose(dest_wave_file);return -3;}while( !feof(src_pcm_file)){char readBuf[4096];int nRead = fread(readBuf, 1, 4096, src_pcm_file);if (nRead > 0){fwrite(readBuf, 1, nRead, dest_wave_file); }nFileLen += nRead;}printf("文件指针位置： %d\n", ftell(dest_wave_file));//将目的文件的游标指针指向文件的开头printf("nFileLen的大小： %d\n nSize的大小：%d\n", nFileLen, nSize);fseek(dest_wave_file, 0, SEEK_SET);wave_head.package_len = nFileLen - 8 + nSize;wave_head.data_len = nFileLen;nWrite = fwrite(&wave_head, 1, nSize, dest_wave_file);if (nWrite != nSize){fclose(src_pcm_file);fclose(dest_wave_file);return -4;}fclose(src_pcm_file);fclose(dest_wave_file);return 0; }};int main(char args []){Pcm2Wave pp;pp.set_sample_rate(11025);pp.change("jj.pcm", "jj.wav");return 0 ;}
wave.h头文件
typedef struct WAVE_HEAD{char riff_char[4]; // "RIFF" char riff_id[4]="RIFF"int package_len ; //文件总长-8 long int size0=文总长-8char wave[4];char fmt[4];int format_len; short fixed;// fmttag=0x01short channel_number; // channel=1 或2int sample_rate; // 采样率 long int samplespersecint byte_rate; // 每秒播放字节数 long int bytepersecshort byte_per_sample; // 采样一次占字节数 int blockalign=声道数*量化数/8short bits_per_sample; // 量化数 int bitpersamples=8或16char fccID[4]; // must be "fact"int id; // must be 0x4int dwSize; // 暂时没发现有啥用char data_field[4]; // data_id="data"int data_len; // 采样数据字节数 long int size2=文长-44 } WAVE_HEAD;
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