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iOS アプリケーションで使用できるオーディオ出力をリストする必要があります。私の質問は次のようなものです: How to list available audio output route on iOS

私はこのコードを試しました：

NSError *setCategoryError = nil;
BOOL success = [[AVAudioSession sharedInstance] setCategory: AVAudioSessionCategoryPlayback
                                                      error: &setCategoryError];

NSError *activationError = nil;
[[AVAudioSession sharedInstance] setActive: YES error: &activationError];

…
NSLog(@"session.currentRoute.outputs count %d", [[[[AVAudioSession sharedInstance] currentRoute] outputs ] count]);
for (AVAudioSessionPortDescription *portDesc in [[[AVAudioSession sharedInstance] currentRoute] outputs ]) {
    NSLog(@"-----");
    NSLog(@"portDesc UID %@", portDesc.UID);
    NSLog(@"portDesc portName %@", portDesc.portName);
    NSLog(@"portDesc portType %@", portDesc.portType);
    NSLog(@"portDesc channels %@", portDesc.channels);
}

ただし、出力ポートが 2 つ (Airplay と内蔵スピーカー) ある場合でも、出力ポートは常に 1 つしか表示されません (カウントは 1)。音楽アプリケーションを使用すると、両方のポートを確認してそれらを切り替えることができます。私のアプリでは、選択したものしか表示されません。

他に何かする必要がありますか？

ありがとうございました

編集：

私もこのコードを試しました：

CFDictionaryRef asCFType = nil;
UInt32 dataSize = sizeof(asCFType);
AudioSessionGetProperty(kAudioSessionProperty_AudioRouteDescription, &dataSize, &asCFType);
NSDictionary *audioRoutesDesc = (__bridge NSDictionary *)asCFType;
NSLog(@"audioRoutesDesc %@", audioRoutesDesc);

ただし、辞書リストには出力先が 1 つしかありません。さらに、入力ソース配列は空です (私は iPhone 4s を持っています)

EDIT2：

MPVolumeView を使用して何かが機能しました。このコンポーネントには、音楽アプリのように、出力オーディオ ルートを選択できるボタンがあります。

必要に応じて、次を使用してスライダーを非表示にする (ボタンのみを表示する) ことができます。

self.myMPVolumeView.showsVolumeSlider = NO;
4

4 に答える 4

3

このようなものを試してみてください。必要以上ですが、減らすことができます。

    + (NSString *) demonstrateInputSelection
{
    NSError* theError = nil;
    BOOL result = YES;
    NSMutableString *info = [[NSMutableString alloc] init];
    [info appendString: @"     Device Audio Input Hardware\n"];

    NSString *str = nil;
    if( iOSMajorVersion < 7 ){
        str = @"No input device information available";
        NSLog(@"%@",str);
        [info appendFormat:@"%@\n",str];

        return info;
    }

    AVAudioSession* myAudioSession = [AVAudioSession sharedInstance];

    result = [myAudioSession setCategory:AVAudioSessionCategoryPlayAndRecord error:&theError];
    if (!result)
    {
        NSLog(@"setCategory failed");
    }

    result = [myAudioSession setActive:YES error:&theError];
    if (!result)
    {
        NSLog(@"setActive failed");
    }

    // Get the set of available inputs. If there are no audio accessories attached, there will be
    // only one available input -- the built in microphone.
    NSArray* inputs = [myAudioSession availableInputs];
    str = [NSString stringWithFormat:@"\n--- Ports available on %@: %d ---", [UIDevice currentDevice].name , [inputs count]];
    NSLog(@"%@",str);
    [info appendFormat:@"%@\n",str];

    // Locate the Port corresponding to the built-in microphone.
    AVAudioSessionPortDescription* builtInMicPort = nil;
    AVAudioSessionDataSourceDescription* frontDataSource = nil;

    for (AVAudioSessionPortDescription* port in inputs)
    {
        // Print out a description of the data sources for the built-in microphone
        str = @"\n**********";
        NSLog(@"%@",str);
        [info appendFormat:@"%@\n",str];
        str = [NSString stringWithFormat:@"Port :\"%@\": UID:%@", port.portName, port.UID ];
        NSLog(@"%@",str);
        [info appendFormat:@"%@\n",str];
        if( [port.dataSources count] ){
            str = [NSString stringWithFormat:@"Port has %d data sources",(unsigned)[port.dataSources count] ];
            NSLog(@"%@",str);
            [info appendFormat:@"%@\n",str];
        }

        str = [NSString stringWithFormat:@">%@", port.dataSources];
        NSLog(@"%@",str);
   //     [info appendFormat:@"%@\n",str];

        if( [port.portType isEqualToString:AVAudioSessionPortLineIn] ){
            str = @"Line Input found";
            NSLog(@"%@",str);
            [info appendFormat:@"%@\n",str];
        }
        else if( [port.portType isEqualToString:AVAudioSessionPortUSBAudio] ){
            str = @"USB Audio found";
            NSLog(@"%@",str);
            [info appendFormat:@"%@\n",str];
        }
        else if ([port.portType isEqualToString:AVAudioSessionPortBuiltInMic]){
            builtInMicPort = port;
            str = @"Built-in Mic found";
            NSLog(@"%@",str);
            [info appendFormat:@"%@\n",str];
        }
        else if ([port.portType isEqualToString:AVAudioSessionPortHeadsetMic]){
            builtInMicPort = port;
            str = @"Headset Mic found";
            NSLog(@"%@",str);
            [info appendFormat:@"%@\n",str];
        }
        else{
            str = @"Other input source found";
            NSLog(@"%@",str);
            [info appendFormat:@"%@\n",str];
        }

        // loop over the built-in mic's data sources and attempt to locate the front microphone
        for (AVAudioSessionDataSourceDescription* source in port.dataSources)
        {
            str = [NSString stringWithFormat:@"\nName:%@ (%d) \nPolar:%@ \nType:%@ \nPatterns:%@", source.dataSourceName, [source.dataSourceID intValue], source.selectedPolarPattern, port.portType, source.supportedPolarPatterns];
            NSLog(@"%@",str);
            [info appendFormat:@"%@\n",str];

            //           if ([source.orientation isEqual:AVAudioSessionOrientationFront])
            //           {
            //               frontDataSource = source;
            //               break;
            //           }
        } // end data source iteration

    }

    str = @"\n----  Current Selected Ports ----\n";
    NSLog(@"%@",str);
    [info appendFormat:@"%@",str];

    NSArray *currentInputs = myAudioSession.currentRoute.inputs;
//    str = [NSString stringWithFormat:@"\n%d current input ports", [currentInputs count]];
//    NSLog(@"%@",str);
//    [info appendFormat:@"%@\n",str];
    for( AVAudioSessionPortDescription *port in currentInputs ){
        str = [NSString stringWithFormat:@"\nInput Port :\"%@\":", port.portName ];
        NSLog(@"%@",str);
        [info appendFormat:@"%@\n",str];
        if( [port.dataSources count] ){
            str = [NSString stringWithFormat:@"Port has %d data sources",(unsigned)[port.dataSources count] ];
            NSLog(@"%@",str);
            [info appendFormat:@"%@\n",str];

            str = [NSString stringWithFormat:@"Selected data source:%@",  port.selectedDataSource.dataSourceName];
            NSLog(@"%@",str);
            [info appendFormat:@"%@\n",str];

            if( [port.selectedDataSource.supportedPolarPatterns count] > 0 ){
                str = [NSString stringWithFormat:@"Selected polar pattern:%@", port.selectedDataSource.selectedPolarPattern];
                NSLog(@"%@",str);
                [info appendFormat:@"%@\n",str];
            }
        }
    }

    NSArray *currentOutputs = myAudioSession.currentRoute.outputs;
//    str = [NSString stringWithFormat:@"\n%d current output ports", [currentOutputs count]];
//    NSLog(@"%@",str);
//    [info appendFormat:@"%@\n",str];
    for( AVAudioSessionPortDescription *port in currentOutputs ){
        str = [NSString stringWithFormat:@"\nOutput Port :\"%@\":", port.portName ];
        NSLog(@"%@",str);
        [info appendFormat:@"%@\n",str];
        if( [port.dataSources count] ){
            str = [NSString stringWithFormat:@"Port has %d data sources",(unsigned)[port.dataSources count] ];
            NSLog(@"%@",str);
            [info appendFormat:@"%@\n",str];

            str = [NSString stringWithFormat:@"Selected data source:%@",  port.selectedDataSource.dataSourceName];
            NSLog(@"%@",str);
            [info appendFormat:@"%@\n",str];
        }

    }

//    str = [NSString stringWithFormat:@"\Current Route: %@ Source:%@\n", myAudioSession.currentRoute.portName, myAudioSession.preferredInput.selectedDataSource.dataSourceName];
//    NSLog(@"%@",str);
//    [info appendFormat:@"%@\n",str];


    if( myAudioSession.preferredInput.portName ){
        str = [NSString stringWithFormat:@"\nPreferred Port: %@ Source:%@\n", myAudioSession.preferredInput.portName, myAudioSession.preferredInput.selectedDataSource.dataSourceName];
    } else {
        str = @"\nNo Preferred Port set";
    }
    NSLog(@"%@",str);
    [info appendFormat:@"%@\n",str];

    return info;

    if (frontDataSource)
    {
        NSLog(@"Currently selected source is \"%@\" for port \"%@\"", builtInMicPort.selectedDataSource.dataSourceName, builtInMicPort.portName);
        NSLog(@"Attempting to select source \"%@\" on port \"%@\"", frontDataSource, builtInMicPort.portName);

        // Set a preference for the front data source.
        theError = nil;
        result = [builtInMicPort setPreferredDataSource:frontDataSource error:&theError];
        if (!result)
        {
            // an error occurred. Handle it!
            NSLog(@"setPreferredDataSource failed");
        }
    }

    // Make sure the built-in mic is selected for input. This will be a no-op if the built-in mic is
    // already the current input Port.
    theError = nil;
    result = [myAudioSession setPreferredInput:builtInMicPort error:&theError];
    if (!result)
    {
        // an error occurred. Handle it!
        NSLog(@"setPreferredInput failed");
    }

    return info;
}
于 2014-09-19T03:33:59.363 に答える
2 
AVAudioSessionRouteDescription *currentRoute = [[AVAudioSession sharedInstance] currentRoute];
    for (AVAudioSessionPortDescription *output in currentRoute.outputs) {

    }
于 2016-01-27T19:29:31.670 に答える