[英]stream Remote IO Audio Unit from one iPhone to another
我发现了3-4个示例,它们显示了远程IO音频单元的用法。 像这里 , 这里等。它们会隐藏来自iPhone麦克风的模拟音频数据,并将其数字化,然后再播放。 到目前为止,一切正常,现在我对音频单元有了很好的了解。
现在,而不是在同一设备上播放存储在AudioBufferList中的已录制音频,我想将其流式传输到另一台设备。
下面是我将AudioBufferList转换为nsdata并将其发送到另一台设备的方式。
NSMutableDictionary *dict = [NSMutableDictionary dictionaryWithObject:@(bufferList->mNumberBuffers) forKey:@"buffersCount"];
NSMutableArray *buffers = [NSMutableArray array];
for ( int i=0; i< bufferList->mNumberBuffers; i++ ) {
NSData *data = [NSData dataWithBytes:bufferList->mBuffers[i].mData length:bufferList->mBuffers[i].mDataByteSize];
NSDictionary *obj = @{@"data":data, @"channels":@(bufferList->mBuffers[i].mNumberChannels)};
[buffers addObject:obj];
}
[dict setValue:buffers forKey:@"buffers"];
NSData *packet = [NSKeyedArchiver archivedDataWithRootObject:dict];
下面是我将nsdata转换回接收设备上的AudioBufferList并将其复制到tempBuffer的方法。
NSDictionary *dict = (NSDictionary*) [NSKeyedUnarchiver unarchiveObjectWithData:voiceData];
int numberOfBuffers = [dict[@"buffersCount"] intValue];
AudioBufferList *audio = malloc(sizeof(AudioBufferList) + (numberOfBuffers-1)*sizeof(AudioBuffer));
if ( !audio ) {
return;
}
for (int i=0; i < audio->mNumberBuffers; i++) { // in practice we will only ever have 1 buffer, since audio format is mono
AudioBuffer buffer = audio->mBuffers[i];
NSLog(@"Buffer %d has %d channels and wants %d bytes of data.", i, (unsigned int)buffer.mNumberChannels, buffer.mDataByteSize);
// copy temporary buffer data to output buffer
UInt32 size = min(buffer.mDataByteSize, [iosAudio tempBuffer].mDataByteSize); // dont copy more data then we have, or then fits
memcpy(buffer.mData, [iosAudio tempBuffer].mData, size);
buffer.mDataByteSize = size; // indicate how much data we wrote in the buffer
}
但是在另一台设备上,我听不到任何声音。
请指导可能有什么问题。
您没有从字典中检索任何数据,只是从缓冲区中检索了一些数据。
NSDictionary *dict = [NSKeyedUnarchiver unarchiveObjectWithData:data];
NSLog(@"%@", dict);
int numberOfBuffers = [dict[@"buffersCount"] intValue];
NSLog(@"%d", numberOfBuffers);
AudioBufferList *audioBufferList = (AudioBufferList *)malloc(sizeof(AudioBufferList));
if (NULL == audioBufferList) {
NSLog(@"*** malloc failure for allocating audioBufferList memory");
return;
}
audioBufferList->mNumberBuffers = (int)dict[@"buffersCount"];
for(NSDictionary *obj in dict[@"buffers"]){
NSMutableData *data = [NSMutableData dataWithData:obj[@"data"]];
audioBufferList->mBuffers[0].mNumberChannels = (int)obj[@"channels"];
audioBufferList->mBuffers[0].mDataByteSize = (int)[data length];
audioBufferList->mBuffers[0].mData = (AudioBuffer *)malloc([data length]);
if (NULL == audioBufferList->mBuffers[0].mData) {
NSLog(@"*** malloc failure for allocating mData memory");
return;
}
memcpy(audioBufferList->mBuffers[0].mData, [data mutableBytes], [data length]);
NSLog(@"Buffer has %d channels and wants %d bytes of data.", (unsigned int)audioBufferList->mBuffers[0].mNumberChannels, (unsigned int)audioBufferList->mBuffers[0].mDataByteSize);
}
有两种方法可以打开两个设备之间的网络连接。 您想要执行此操作,并以所需的任何格式将数据打包到设备A到设备B中。
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