经过一番来回,看起来使用 MixWithOthers 是关键。您还必须确保将音频路由设置为最后/当前音频路由...
仅供参考,这是使用 AudioQueue 接口
所以我们...
/ 使用 iPod 开始音乐 / 使用以下方式启动我们的应用程序
- 音频队列新输入
- AudioQueueAddPropertyListener
- AudioQueueAllocateBuffer(s)
- AudioQueueEnqueueBuffer(s)
- setupCat
- 设置鸭
- 设置音频路由
- 设置混合
- AudioSessionSetActive (true)
- 音频队列开始
typedef union
{
OSStatus propertyResult;
char a[4];
} unionstatus;
unionstatus u2;
typedef union
{
UInt32 UI32sessionCat;
char a[4];
} unionuint32;
unionuint32 usc2;
bool setAudioUInt32 ( UInt32 property, UInt32 value )
{
bool result = true;
UInt32 UI32 = value;
UInt32 UI32size = sizeof(UI32);
u2.propertyResult = AudioSessionSetProperty (property, UI32size , &UI32 );
if ( u2.propertyResult )
{
printf("Error Set %ld %lx %c%c%c%c\n",u2.propertyResult,u2.propertyResult,u2.a[3],u2.a[2],u2.a[1],u2.a[0]);
result = false;
}
return result;
}
UInt32 getAudioSettingInt ( UInt32 value )
{
UInt32 I32;
UInt32 I32size = sizeof(I32);
u2.propertyResult = AudioSessionGetProperty ( value , &I32size, &I32 );
if ( u2.propertyResult )
printf("Error Get %ld %lx %c%c%c%c\n",u2.propertyResult,u2.propertyResult,u2.a[3],u2.a[2],u2.a[1],u2.a[0]);
return (I32);
}
/// checking taken out
bool otherPlaying = getAudioSettingInt ( kAudioSessionProperty_OtherAudioIsPlaying );
if ( otherPlaying )
{
setAudioUInt32 (kAudioSessionProperty_OtherMixableAudioShouldDuck, false);
// this returns a string, arg, have to look for string values, etc.
UInt32 audioRoute = getAudioSettingInt ( kAudioSessionProperty_AudioRoute );
CFStringRef ar = (CFStringRef) audioRoute;
CFStringEncoding encodingMethod = CFStringGetSystemEncoding();
const char *car = CFStringGetCStringPtr(ar,encodingMethod);
CFRange range = CFStringFind(ar,CFSTR("Headphones"),kCFCompareCaseInsensitive);
if ( range.length == 0 ) // we have speakers
result = setAudioUInt32 (kAudioSessionProperty_OverrideAudioRoute, kAudioSessionOverrideAudioRoute_Speaker);
else // we have headphones
{}
}