Android音视频学习第8章：使用fmod对音频进行变调处理

使用fmod模仿QQ变声处理

用到的变量

    System *system;
    Sound *sound;
    Channel *channel;
    DSP *dsp;
    bool playing = true;
    float frequency = 0;

初始化

    System_Create(&system);
system->init(32, FMOD_INIT_NORMAL, NULL);

创建声音（来自内存的wav音频）

const char* path_cstr = env->GetStringUTFChars(path_jstr,NULL);
//创建声音
        system->createSound(path_cstr, FMOD_DEFAULT, NULL, &sound);

正常声音

//原生播放
system->playSound(sound, 0, false, &channel);

萝莉

//萝莉
//DSP digital signal process
//dsp -> 音效 创建fmod中预定义好的音效
//FMOD_DSP_TYPE_PITCHSHIFT dsp，提升或者降低音调用的一种音效
system->createDSPByType(FMOD_DSP_TYPE_PITCHSHIFT,&dsp);
//设置音调的参数
dsp->setParameterFloat(FMOD_DSP_PITCHSHIFT_PITCH,2.5);

system->playSound(sound, 0, false, &channel);
//添加到channel
channel->addDSP(0,dsp);

惊悚

system->createDSPByType(FMOD_DSP_TYPE_TREMOLO,&dsp);
dsp->setParameterFloat(FMOD_DSP_TREMOLO_SKEW, 0.5);
system->playSound(sound, 0, false, &channel);
channel->addDSP(0,dsp);

大叔

system->createDSPByType(FMOD_DSP_TYPE_PITCHSHIFT,&dsp);
dsp->setParameterFloat(FMOD_DSP_PITCHSHIFT_PITCH,0.8);
system->playSound(sound, 0, false, &channel);
//添加到channel
channel->addDSP(0,dsp);

搞怪（提高说话的速度）

system->playSound(sound, 0, false, &channel);
channel->getFrequency(&frequency);
frequency = frequency * 1.6;
channel->setFrequency(frequency);

空灵

system->createDSPByType(FMOD_DSP_TYPE_ECHO,&dsp);
dsp->setParameterFloat(FMOD_DSP_ECHO_DELAY,300);
dsp->setParameterFloat(FMOD_DSP_ECHO_FEEDBACK,20);
system->playSound(sound, 0, false, &channel);
channel->addDSP(0,dsp);

播放

    system->update();

//释放资源
//单位是微秒
//每秒钟判断下是否在播放
while(playing){
        channel->isPlaying(&playing);
usleep(1000 * 1000);
    }

释放资源

    env->ReleaseStringUTFChars(path_jstr,path_cstr);
    sound->release();
    system->close();
    system->release();

完整代码

#include "inc/fmod.hpp"

#include <stdlib.h>
#include <unistd.h>
#include "org_fmod_example_EffectUtils.h"

#include <android/log.h>
#define LOGI(FORMAT,...) __android_log_print(ANDROID_LOG_INFO,"jason",FORMAT,##__VA_ARGS__);
#define LOGE(FORMAT,...) __android_log_print(ANDROID_LOG_ERROR,"jason",FORMAT,##__VA_ARGS__);

#define MODE_NORMAL 0
#define MODE_LUOLI 1
#define MODE_DASHU 2
#define MODE_JINGSONG 3
#define MODE_GAOGUAI 4
#define MODE_KONGLING 5

using namespace FMOD;

JNIEXPORT void JNICALL Java_org_fmod_example_EffectUtils_fix
  (JNIEnv *env, jclass jcls, jstring path_jstr, jint type){
    System *system;
    Sound *sound;
    Channel *channel;
    DSP *dsp;
bool playing = true;
float frequency = 0;

const char* path_cstr = env->GetStringUTFChars(path_jstr,NULL);
    LOGI("%s",path_cstr);
try {
//初始化
        System_Create(&system);
        system->init(32, FMOD_INIT_NORMAL, NULL);

//创建声音
        system->createSound(path_cstr, FMOD_DEFAULT, NULL, &sound);
switch (type) {
case MODE_NORMAL:
//原生播放
                system->playSound(sound, 0, false, &channel);
                LOGI("%s","fix normal");
break;
case MODE_LUOLI:
//萝莉
//DSP digital signal process
//dsp -> 音效 创建fmod中预定义好的音效
//FMOD_DSP_TYPE_PITCHSHIFT dsp，提升或者降低音调用的一种音效
                system->createDSPByType(FMOD_DSP_TYPE_PITCHSHIFT,&dsp);
//设置音调的参数
                dsp->setParameterFloat(FMOD_DSP_PITCHSHIFT_PITCH,2.5);

                system->playSound(sound, 0, false, &channel);
//添加到channel
                channel->addDSP(0,dsp);
                LOGI("%s","fix luoli");
break;

case MODE_JINGSONG:
//惊悚
                system->createDSPByType(FMOD_DSP_TYPE_TREMOLO,&dsp);
                dsp->setParameterFloat(FMOD_DSP_TREMOLO_SKEW, 0.5);
                system->playSound(sound, 0, false, &channel);
                channel->addDSP(0,dsp);

break;
case MODE_DASHU:
//大叔
                system->createDSPByType(FMOD_DSP_TYPE_PITCHSHIFT,&dsp);
                dsp->setParameterFloat(FMOD_DSP_PITCHSHIFT_PITCH,0.8);

                system->playSound(sound, 0, false, &channel);
//添加到channel
                channel->addDSP(0,dsp);
                LOGI("%s","fix dashu");
break;
case MODE_GAOGUAI:
//搞怪
//提高说话的速度
                system->playSound(sound, 0, false, &channel);
                channel->getFrequency(&frequency);
                frequency = frequency * 1.6;
                channel->setFrequency(frequency);
                LOGI("%s","fix gaoguai");
break;
case MODE_KONGLING:
//空灵
                system->createDSPByType(FMOD_DSP_TYPE_ECHO,&dsp);
                dsp->setParameterFloat(FMOD_DSP_ECHO_DELAY,300);
                dsp->setParameterFloat(FMOD_DSP_ECHO_FEEDBACK,20);
                system->playSound(sound, 0, false, &channel);
                channel->addDSP(0,dsp);
                LOGI("%s","fix kongling");
break;

default:
break;
        }
    } catch (...) {
        LOGE("%s","发生异常");
goto end;
    }
    system->update();

//释放资源
//单位是微秒
//每秒钟判断下是否在播放
while(playing){
        channel->isPlaying(&playing);
        usleep(1000 * 1000);
    }
goto end;
end:
    env->ReleaseStringUTFChars(path_jstr,path_cstr);
    sound->release();
    system->close();
    system->release();

}