qtmultimedia/src/multimedia/audio/qaudiodeviceinfo_mac_p.cpp

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**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
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** Contact: Nokia Corporation (qt-info@nokia.com)
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** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
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** file. Please review the following information to ensure the GNU General
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//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists for the convenience
// of other Qt classes.  This header file may change from version to
// version without notice, or even be removed.
//
// INTERNAL USE ONLY: Do NOT use for any other purpose.
//

#include <QtCore/qstringlist.h>
#include <QtCore/qlist.h>
#include <QtCore/qbytearray.h>
#include <QtCore/qdatastream.h>
#include <QtCore/qdebug.h>

#include <qaudiodeviceinfo.h>
#include "qaudio_mac_p.h"
#include "qaudiodeviceinfo_mac_p.h"



QT_BEGIN_NAMESPACE

// XXX: remove at some future date
static inline QString cfStringToQString(CFStringRef str)
{
    CFIndex length = CFStringGetLength(str);
    const UniChar *chars = CFStringGetCharactersPtr(str);
    if (chars)
        return QString(reinterpret_cast<const QChar *>(chars), length);

    UniChar buffer[length];
    CFStringGetCharacters(str, CFRangeMake(0, length), buffer);
    return QString(reinterpret_cast<const QChar *>(buffer), length);
}

QAudioDeviceInfoInternal::QAudioDeviceInfoInternal(QByteArray const& handle, QAudio::Mode)
{
    QDataStream ds(handle);
    quint32 did, tm;

    ds >> did >> tm >> name;
    deviceId = AudioDeviceID(did);
    mode = QAudio::Mode(tm);
}

bool QAudioDeviceInfoInternal::isFormatSupported(const QAudioFormat& format) const
{
    QAudioDeviceInfoInternal *self = const_cast<QAudioDeviceInfoInternal*>(this);

    return format.isValid()
            && format.codec() == QString::fromLatin1("audio/pcm")
            && self->supportedSampleRates().contains(format.sampleRate())
            && self->supportedChannelCounts().contains(format.channelCount())
            && self->supportedSampleSizes().contains(format.sampleSize());
}

QAudioFormat QAudioDeviceInfoInternal::preferredFormat() const
{
    QAudioFormat    rc;

    UInt32  propSize = 0;

    if (AudioDeviceGetPropertyInfo(deviceId,
                                    0,
                                    mode == QAudio::AudioInput,
                                    kAudioDevicePropertyStreams,
                                    &propSize,
                                    0) == noErr) {

        const int sc = propSize / sizeof(AudioStreamID);

        if (sc > 0) {
            AudioStreamID*  streams = new AudioStreamID[sc];

            if (AudioDeviceGetProperty(deviceId,
                                        0,
                                        mode == QAudio::AudioInput,
                                        kAudioDevicePropertyStreams,
                                        &propSize,
                                        streams) == noErr) {

                for (int i = 0; i < sc; ++i) {
                    if (AudioStreamGetPropertyInfo(streams[i],
                                                    0,
                                                    kAudioStreamPropertyPhysicalFormat,
                                                    &propSize,
                                                    0) == noErr) {

                        AudioStreamBasicDescription sf;

                        if (AudioStreamGetProperty(streams[i],
                                                    0,
                                                    kAudioStreamPropertyPhysicalFormat,
                                                    &propSize,
                                                    &sf) == noErr) {
                            rc = toQAudioFormat(sf);
                            break;
                        }
                    }
                }
            }

            delete streams;
        }
    }

    return rc;
}

QString QAudioDeviceInfoInternal::deviceName() const
{
    return name;
}

QStringList QAudioDeviceInfoInternal::supportedCodecs()
{
    return QStringList() << QString::fromLatin1("audio/pcm");
}

QList<int> QAudioDeviceInfoInternal::supportedSampleRates()
{
    QSet<int>  rc;

    // Add some common frequencies
    rc << 8000 << 11025 << 22050 << 44100;

    //
    UInt32  propSize = 0;

    if (AudioDeviceGetPropertyInfo(deviceId,
                                    0,
                                    mode == QAudio::AudioInput,
                                    kAudioDevicePropertyAvailableNominalSampleRates,
                                    &propSize,
                                    0) == noErr) {

        const int pc = propSize / sizeof(AudioValueRange);

        if (pc > 0) {
            AudioValueRange*    vr = new AudioValueRange[pc];

            if (AudioDeviceGetProperty(deviceId,
                                        0,
                                        mode == QAudio::AudioInput,
                                        kAudioDevicePropertyAvailableNominalSampleRates,
                                        &propSize,
                                        vr) == noErr) {

                for (int i = 0; i < pc; ++i)
                    rc << vr[i].mMaximum;
            }

            delete vr;
        }
    }

    return rc.toList();
}

QList<int> QAudioDeviceInfoInternal::supportedChannelCounts()
{
    QList<int>  rc;

    // Can mix down to 1 channel
    rc << 1;

    UInt32  propSize = 0;
    int     channels = 0;

    if (AudioDeviceGetPropertyInfo(deviceId, 
                                    0,
                                    mode == QAudio::AudioInput,
                                    kAudioDevicePropertyStreamConfiguration,
                                    &propSize, 
                                    0) == noErr) {

        AudioBufferList* audioBufferList = static_cast<AudioBufferList*>(qMalloc(propSize));

        if (audioBufferList != 0) {
            if (AudioDeviceGetProperty(deviceId, 
                                        0,
                                        mode == QAudio::AudioInput,
                                        kAudioDevicePropertyStreamConfiguration,
                                        &propSize,
                                        audioBufferList) == noErr) {

                for (int i = 0; i < int(audioBufferList->mNumberBuffers); ++i) {
                    channels += audioBufferList->mBuffers[i].mNumberChannels;
                    rc << channels;
                }
            }

            qFree(audioBufferList);
        }
    }

    return rc;
}

QList<int> QAudioDeviceInfoInternal::supportedSampleSizes()
{
    return QList<int>() << 8 << 16 << 24 << 32 << 64;
}

QList<QAudioFormat::Endian> QAudioDeviceInfoInternal::supportedByteOrders()
{
    return QList<QAudioFormat::Endian>() << QAudioFormat::LittleEndian << QAudioFormat::BigEndian;
}

QList<QAudioFormat::SampleType> QAudioDeviceInfoInternal::supportedSampleTypes()
{
    return QList<QAudioFormat::SampleType>() << QAudioFormat::SignedInt << QAudioFormat::UnSignedInt << QAudioFormat::Float;
}

static QByteArray get_device_info(AudioDeviceID audioDevice, QAudio::Mode mode)
{
    UInt32      size;
    QByteArray  device;
    QDataStream ds(&device, QIODevice::WriteOnly);
    AudioStreamBasicDescription     sf;
    CFStringRef name;
    Boolean     isInput = mode == QAudio::AudioInput;

    // Id
    ds << quint32(audioDevice);

    // Mode
    size = sizeof(AudioStreamBasicDescription);
    if (AudioDeviceGetProperty(audioDevice, 0, isInput, kAudioDevicePropertyStreamFormat,
                                &size, &sf) != noErr) {
        return QByteArray();
    }
    ds << quint32(mode);

    // Name
    size = sizeof(CFStringRef);
    if (AudioDeviceGetProperty(audioDevice, 0, isInput, kAudioObjectPropertyName,
                                &size, &name) != noErr) {
        qWarning() << "QAudioDeviceInfo: Unable to find device name";
        return QByteArray();
    }
    ds << cfStringToQString(name);

    CFRelease(name);

    return device;
}

QByteArray QAudioDeviceInfoInternal::defaultInputDevice()
{
    AudioDeviceID   audioDevice;
    UInt32          size = sizeof(audioDevice);

    if (AudioHardwareGetProperty(kAudioHardwarePropertyDefaultInputDevice, &size,
                                    &audioDevice) != noErr) {
        qWarning() << "QAudioDeviceInfo: Unable to find default input device";
        return QByteArray();
    }

    return get_device_info(audioDevice, QAudio::AudioInput);
}

QByteArray QAudioDeviceInfoInternal::defaultOutputDevice()
{
    AudioDeviceID audioDevice;
    UInt32        size = sizeof(audioDevice);

    if (AudioHardwareGetProperty(kAudioHardwarePropertyDefaultOutputDevice, &size,
                                    &audioDevice) != noErr) {
        qWarning() << "QAudioDeviceInfo: Unable to find default output device";
        return QByteArray();
    }

    return get_device_info(audioDevice, QAudio::AudioOutput);
}

QList<QByteArray> QAudioDeviceInfoInternal::availableDevices(QAudio::Mode mode)
{
    QList<QByteArray>   devices;

    UInt32  propSize = 0;

    if (AudioHardwareGetPropertyInfo(kAudioHardwarePropertyDevices, &propSize, 0) == noErr) {

        const int dc = propSize / sizeof(AudioDeviceID);

        if (dc > 0) {
            AudioDeviceID*  audioDevices = new AudioDeviceID[dc];

            if (AudioHardwareGetProperty(kAudioHardwarePropertyDevices, &propSize, audioDevices) == noErr) {
                for (int i = 0; i < dc; ++i) {
                    QByteArray info = get_device_info(audioDevices[i], mode);
                    if (!info.isNull())
                        devices << info;
                }
            }

            delete audioDevices;
        }
    }

    return devices;
}


QT_END_NAMESPACE