581 lines
17 KiB
C++
581 lines
17 KiB
C++
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/*
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File: ACBaseCodec.cpp
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Abstract: ACBaseCodec.h
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Version: 1.1
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Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple
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Inc. ("Apple") in consideration of your agreement to the following
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terms, and your use, installation, modification or redistribution of
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this Apple software constitutes acceptance of these terms. If you do
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not agree with these terms, please do not use, install, modify or
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redistribute this Apple software.
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In consideration of your agreement to abide by the following terms, and
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subject to these terms, Apple grants you a personal, non-exclusive
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license, under Apple's copyrights in this original Apple software (the
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"Apple Software"), to use, reproduce, modify and redistribute the Apple
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Software, with or without modifications, in source and/or binary forms;
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provided that if you redistribute the Apple Software in its entirety and
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without modifications, you must retain this notice and the following
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text and disclaimers in all such redistributions of the Apple Software.
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Neither the name, trademarks, service marks or logos of Apple Inc. may
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be used to endorse or promote products derived from the Apple Software
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without specific prior written permission from Apple. Except as
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expressly stated in this notice, no other rights or licenses, express or
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implied, are granted by Apple herein, including but not limited to any
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patent rights that may be infringed by your derivative works or by other
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works in which the Apple Software may be incorporated.
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The Apple Software is provided by Apple on an "AS IS" basis. APPLE
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MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
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THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS
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FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND
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OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
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IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL
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OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,
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MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED
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AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),
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STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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Copyright (C) 2014 Apple Inc. All Rights Reserved.
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*/
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//=============================================================================
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// Includes
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//=============================================================================
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#include <algorithm>
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#include "ACBaseCodec.h"
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#include "CABundleLocker.h"
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#if TARGET_OS_WIN32
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#include "CAWin32StringResources.h"
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#endif
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//=============================================================================
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// ACBaseCodec
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//=============================================================================
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ACBaseCodec::ACBaseCodec( AudioComponentInstance inInstance )
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:
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ACCodec(inInstance),
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mIsInitialized(false),
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mInputFormatList(),
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mInputFormat(),
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mOutputFormatList(),
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mOutputFormat()
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{
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mCodecSubType = 0;
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if (inInstance) GetSubType();
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}
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ACBaseCodec::~ACBaseCodec()
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{
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}
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void ACBaseCodec::GetPropertyInfo(AudioCodecPropertyID inPropertyID, UInt32& outPropertyDataSize, Boolean& outWritable)
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{
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switch(inPropertyID)
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{
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#if BUILD_ADEC_LIB
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case kAudioCodecPropertyNameCFString:
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case kAudioCodecPropertyFormatCFString:
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case kAudioCodecPropertyManufacturerCFString:
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outPropertyDataSize = 0;
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outWritable = false;
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break;
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#else
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case kAudioCodecPropertyNameCFString:
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outPropertyDataSize = SizeOf32(CFStringRef);
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outWritable = false;
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break;
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case kAudioCodecPropertyManufacturerCFString:
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outPropertyDataSize = SizeOf32(CFStringRef);
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outWritable = false;
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break;
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case kAudioCodecPropertyFormatCFString:
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outPropertyDataSize = SizeOf32(CFStringRef);
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outWritable = false;
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break;
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#endif
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case kAudioCodecPropertyRequiresPacketDescription:
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outPropertyDataSize = SizeOf32(UInt32);
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outWritable = false;
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break;
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case kAudioCodecPropertyMinimumNumberInputPackets :
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outPropertyDataSize = SizeOf32(UInt32);
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outWritable = false;
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break;
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case kAudioCodecPropertyMinimumNumberOutputPackets :
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outPropertyDataSize = SizeOf32(UInt32);
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outWritable = false;
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break;
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case kAudioCodecPropertyCurrentInputFormat:
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outPropertyDataSize = SizeOf32(AudioStreamBasicDescription);
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outWritable = true;
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break;
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case kAudioCodecPropertySupportedInputFormats:
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case kAudioCodecPropertyInputFormatsForOutputFormat:
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outPropertyDataSize = GetNumberSupportedInputFormats() * SizeOf32(AudioStreamBasicDescription);
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outWritable = false;
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break;
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case kAudioCodecPropertyCurrentOutputFormat:
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outPropertyDataSize = SizeOf32(AudioStreamBasicDescription);
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outWritable = true;
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break;
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case kAudioCodecPropertySupportedOutputFormats:
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case kAudioCodecPropertyOutputFormatsForInputFormat:
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outPropertyDataSize = GetNumberSupportedOutputFormats() * SizeOf32(AudioStreamBasicDescription);
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outWritable = false;
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break;
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case kAudioCodecPropertyMagicCookie:
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outPropertyDataSize = GetMagicCookieByteSize();
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outWritable = true;
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break;
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case kAudioCodecPropertyInputBufferSize:
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outPropertyDataSize = SizeOf32(UInt32);
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outWritable = false;
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break;
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case kAudioCodecPropertyUsedInputBufferSize:
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outPropertyDataSize = SizeOf32(UInt32);
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outWritable = false;
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break;
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case kAudioCodecPropertyIsInitialized:
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outPropertyDataSize = SizeOf32(UInt32);
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outWritable = false;
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break;
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case kAudioCodecPropertyAvailableNumberChannels:
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outPropertyDataSize = SizeOf32(UInt32) * 2; // Mono, stereo
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outWritable = false;
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break;
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case kAudioCodecPropertyPrimeMethod:
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outPropertyDataSize = SizeOf32(UInt32);
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outWritable = false;
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break;
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case kAudioCodecPropertyPrimeInfo:
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outPropertyDataSize = SizeOf32(AudioCodecPrimeInfo);
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outWritable = false;
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break;
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case kAudioCodecPropertyDoesSampleRateConversion:
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outPropertyDataSize = SizeOf32(UInt32);
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outWritable = false;
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break;
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default:
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CODEC_THROW(kAudioCodecUnknownPropertyError);
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break;
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};
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}
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void ACBaseCodec::GetProperty(AudioCodecPropertyID inPropertyID, UInt32& ioPropertyDataSize, void* outPropertyData)
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{
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UInt32 thePacketsToGet;
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switch(inPropertyID)
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{
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#if !BUILD_ADEC_LIB
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case kAudioCodecPropertyNameCFString:
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{
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if (ioPropertyDataSize != SizeOf32(CFStringRef)) CODEC_THROW(kAudioCodecBadPropertySizeError);
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CABundleLocker lock;
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CFStringRef name = CFCopyLocalizedStringFromTableInBundle(CFSTR("unknown codec"), CFSTR("CodecNames"), GetCodecBundle(), CFSTR(""));
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*(CFStringRef*)outPropertyData = name;
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break;
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}
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case kAudioCodecPropertyManufacturerCFString:
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{
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if (ioPropertyDataSize != SizeOf32(CFStringRef)) CODEC_THROW(kAudioCodecBadPropertySizeError);
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CABundleLocker lock;
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CFStringRef name = CFCopyLocalizedStringFromTableInBundle(CFSTR("Apple, Inc."), CFSTR("CodecNames"), GetCodecBundle(), CFSTR(""));
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*(CFStringRef*)outPropertyData = name;
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break;
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}
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#else
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// If called on the device these should return nothing but 0
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case kAudioCodecPropertyNameCFString:
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case kAudioCodecPropertyFormatCFString:
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case kAudioCodecPropertyManufacturerCFString:
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ioPropertyDataSize = 0;
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outPropertyData = 0;
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break;
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#endif
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case kAudioCodecPropertyRequiresPacketDescription:
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if(ioPropertyDataSize == SizeOf32(UInt32))
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{
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*reinterpret_cast<UInt32*>(outPropertyData) = 0;
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}
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else
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{
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CODEC_THROW(kAudioCodecBadPropertySizeError);
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}
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break;
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case kAudioCodecPropertyMinimumNumberInputPackets :
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if(ioPropertyDataSize != SizeOf32(UInt32)) CODEC_THROW(kAudioCodecBadPropertySizeError);
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*(UInt32*)outPropertyData = 1;
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break;
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case kAudioCodecPropertyMinimumNumberOutputPackets :
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if(ioPropertyDataSize != SizeOf32(UInt32)) CODEC_THROW(kAudioCodecBadPropertySizeError);
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*(UInt32*)outPropertyData = 1;
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break;
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case kAudioCodecPropertyCurrentInputFormat:
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if(ioPropertyDataSize == SizeOf32(AudioStreamBasicDescription))
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{
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GetCurrentInputFormat(*reinterpret_cast<AudioStreamBasicDescription*>(outPropertyData));
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}
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else
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{
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CODEC_THROW(kAudioCodecBadPropertySizeError);
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}
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break;
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case kAudioCodecPropertySupportedInputFormats:
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case kAudioCodecPropertyInputFormatsForOutputFormat:
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thePacketsToGet = ioPropertyDataSize / SizeOf32(AudioStreamBasicDescription);
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GetSupportedInputFormats(reinterpret_cast<AudioStreamBasicDescription*>(outPropertyData), thePacketsToGet);
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ioPropertyDataSize = thePacketsToGet * SizeOf32(AudioStreamBasicDescription);
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break;
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case kAudioCodecPropertyCurrentOutputFormat:
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if(ioPropertyDataSize == SizeOf32(AudioStreamBasicDescription))
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{
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GetCurrentOutputFormat(*reinterpret_cast<AudioStreamBasicDescription*>(outPropertyData));
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}
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else
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{
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CODEC_THROW(kAudioCodecBadPropertySizeError);
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}
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break;
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case kAudioCodecPropertySupportedOutputFormats:
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case kAudioCodecPropertyOutputFormatsForInputFormat:
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thePacketsToGet = ioPropertyDataSize / SizeOf32(AudioStreamBasicDescription);
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GetSupportedOutputFormats(reinterpret_cast<AudioStreamBasicDescription*>(outPropertyData), thePacketsToGet);
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ioPropertyDataSize = thePacketsToGet * SizeOf32(AudioStreamBasicDescription);
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break;
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case kAudioCodecPropertyMagicCookie:
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if(ioPropertyDataSize >= GetMagicCookieByteSize())
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{
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GetMagicCookie(outPropertyData, ioPropertyDataSize);
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}
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else
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{
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CODEC_THROW(kAudioCodecBadPropertySizeError);
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}
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break;
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case kAudioCodecPropertyInputBufferSize:
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if(ioPropertyDataSize == SizeOf32(UInt32))
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{
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*reinterpret_cast<UInt32*>(outPropertyData) = GetInputBufferByteSize();
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}
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else
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{
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CODEC_THROW(kAudioCodecBadPropertySizeError);
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}
|
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break;
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case kAudioCodecPropertyUsedInputBufferSize:
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if(ioPropertyDataSize == SizeOf32(UInt32))
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{
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*reinterpret_cast<UInt32*>(outPropertyData) = GetUsedInputBufferByteSize();
|
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|
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}
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else
|
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|
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{
|
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CODEC_THROW(kAudioCodecBadPropertySizeError);
|
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|
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}
|
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break;
|
||
|
|
|
||
|
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case kAudioCodecPropertyIsInitialized:
|
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|
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if(ioPropertyDataSize == SizeOf32(UInt32))
|
||
|
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{
|
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|
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*reinterpret_cast<UInt32*>(outPropertyData) = IsInitialized() ? 1 : 0;
|
||
|
|
}
|
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|
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else
|
||
|
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{
|
||
|
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CODEC_THROW(kAudioCodecBadPropertySizeError);
|
||
|
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}
|
||
|
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break;
|
||
|
|
|
||
|
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case kAudioCodecPropertyAvailableNumberChannels:
|
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|
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if(ioPropertyDataSize == SizeOf32(UInt32) * 2)
|
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|
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{
|
||
|
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(reinterpret_cast<UInt32*>(outPropertyData))[0] = 1;
|
||
|
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(reinterpret_cast<UInt32*>(outPropertyData))[1] = 2;
|
||
|
|
}
|
||
|
|
else
|
||
|
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{
|
||
|
|
CODEC_THROW(kAudioCodecBadPropertySizeError);
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
case kAudioCodecPropertyPrimeMethod:
|
||
|
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if(ioPropertyDataSize == SizeOf32(UInt32))
|
||
|
|
{
|
||
|
|
*reinterpret_cast<UInt32*>(outPropertyData) = (UInt32)kAudioCodecPrimeMethod_None;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
CODEC_THROW(kAudioCodecBadPropertySizeError);
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
case kAudioCodecPropertyPrimeInfo:
|
||
|
|
if(ioPropertyDataSize == SizeOf32(AudioCodecPrimeInfo) )
|
||
|
|
{
|
||
|
|
(reinterpret_cast<AudioCodecPrimeInfo*>(outPropertyData))->leadingFrames = 0;
|
||
|
|
(reinterpret_cast<AudioCodecPrimeInfo*>(outPropertyData))->trailingFrames = 0;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
CODEC_THROW(kAudioCodecBadPropertySizeError);
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
case kAudioCodecPropertyDoesSampleRateConversion:
|
||
|
|
if(ioPropertyDataSize == SizeOf32(UInt32))
|
||
|
|
{
|
||
|
|
*reinterpret_cast<UInt32*>(outPropertyData) = 0;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
CODEC_THROW(kAudioCodecBadPropertySizeError);
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
default:
|
||
|
|
CODEC_THROW(kAudioCodecUnknownPropertyError);
|
||
|
|
break;
|
||
|
|
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
void ACBaseCodec::SetProperty(AudioCodecPropertyID inPropertyID, UInt32 inPropertyDataSize, const void* inPropertyData)
|
||
|
|
{
|
||
|
|
// No property can be set when the codec is initialized
|
||
|
|
if(mIsInitialized)
|
||
|
|
{
|
||
|
|
CODEC_THROW(kAudioCodecIllegalOperationError);
|
||
|
|
}
|
||
|
|
|
||
|
|
switch(inPropertyID)
|
||
|
|
{
|
||
|
|
case kAudioCodecPropertyCurrentInputFormat:
|
||
|
|
if(inPropertyDataSize == SizeOf32(AudioStreamBasicDescription))
|
||
|
|
{
|
||
|
|
SetCurrentInputFormat(*reinterpret_cast<const AudioStreamBasicDescription*>(inPropertyData));
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
CODEC_THROW(kAudioCodecBadPropertySizeError);
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
case kAudioCodecPropertyCurrentOutputFormat:
|
||
|
|
if(inPropertyDataSize == SizeOf32(AudioStreamBasicDescription))
|
||
|
|
{
|
||
|
|
SetCurrentOutputFormat(*reinterpret_cast<const AudioStreamBasicDescription*>(inPropertyData));
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
CODEC_THROW(kAudioCodecBadPropertySizeError);
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
case kAudioCodecPropertyMagicCookie:
|
||
|
|
SetMagicCookie(inPropertyData, inPropertyDataSize);
|
||
|
|
break;
|
||
|
|
|
||
|
|
case kAudioCodecPropertyMinimumNumberOutputPackets :
|
||
|
|
case kAudioCodecPropertyMinimumNumberInputPackets :
|
||
|
|
case kAudioCodecPropertyInputBufferSize:
|
||
|
|
case kAudioCodecPropertyNameCFString:
|
||
|
|
case kAudioCodecPropertyManufacturerCFString:
|
||
|
|
case kAudioCodecPropertyFormatCFString:
|
||
|
|
case kAudioCodecPropertySupportedInputFormats:
|
||
|
|
case kAudioCodecPropertySupportedOutputFormats:
|
||
|
|
case kAudioCodecPropertyUsedInputBufferSize:
|
||
|
|
case kAudioCodecPropertyIsInitialized:
|
||
|
|
case kAudioCodecPropertyAvailableNumberChannels:
|
||
|
|
case kAudioCodecPropertyPrimeMethod:
|
||
|
|
case kAudioCodecPropertyPrimeInfo:
|
||
|
|
case kAudioCodecPropertyOutputFormatsForInputFormat:
|
||
|
|
case kAudioCodecPropertyInputFormatsForOutputFormat:
|
||
|
|
case kAudioCodecPropertyDoesSampleRateConversion:
|
||
|
|
case kAudioCodecPropertyRequiresPacketDescription:
|
||
|
|
CODEC_THROW(kAudioCodecIllegalOperationError);
|
||
|
|
break;
|
||
|
|
|
||
|
|
default:
|
||
|
|
CODEC_THROW(kAudioCodecUnknownPropertyError);
|
||
|
|
break;
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
void ACBaseCodec::Initialize(const AudioStreamBasicDescription* /* inInputFormat */, const AudioStreamBasicDescription* /* inOutputFormat */, const void* /* inMagicCookie */, UInt32 /* inMagicCookieByteSize */)
|
||
|
|
{
|
||
|
|
mIsInitialized = true;
|
||
|
|
}
|
||
|
|
|
||
|
|
void ACBaseCodec::Uninitialize()
|
||
|
|
{
|
||
|
|
mIsInitialized = false;
|
||
|
|
}
|
||
|
|
|
||
|
|
void ACBaseCodec::Reset()
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
UInt32 ACBaseCodec::GetNumberSupportedInputFormats() const
|
||
|
|
{
|
||
|
|
return (UInt32)mInputFormatList.size();
|
||
|
|
}
|
||
|
|
|
||
|
|
void ACBaseCodec::GetSupportedInputFormats(AudioStreamBasicDescription* outInputFormats, UInt32& ioNumberInputFormats) const
|
||
|
|
{
|
||
|
|
UInt32 theNumberFormats = (UInt32)mInputFormatList.size();
|
||
|
|
ioNumberInputFormats = (theNumberFormats < ioNumberInputFormats) ? theNumberFormats : ioNumberInputFormats;
|
||
|
|
|
||
|
|
FormatList::const_iterator theIterator = mInputFormatList.begin();
|
||
|
|
theNumberFormats = ioNumberInputFormats;
|
||
|
|
while((theNumberFormats > 0) && (theIterator != mInputFormatList.end()))
|
||
|
|
{
|
||
|
|
*outInputFormats = *theIterator;
|
||
|
|
|
||
|
|
++outInputFormats;
|
||
|
|
--theNumberFormats;
|
||
|
|
std::advance(theIterator, 1);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void ACBaseCodec::GetCurrentInputFormat(AudioStreamBasicDescription& outInputFormat)
|
||
|
|
{
|
||
|
|
outInputFormat = mInputFormat;
|
||
|
|
}
|
||
|
|
|
||
|
|
void ACBaseCodec::SetCurrentInputFormat(const AudioStreamBasicDescription& inInputFormat)
|
||
|
|
{
|
||
|
|
if(!mIsInitialized)
|
||
|
|
{
|
||
|
|
mInputFormat = inInputFormat;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
CODEC_THROW(kAudioCodecStateError);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
UInt32 ACBaseCodec::GetNumberSupportedOutputFormats() const
|
||
|
|
{
|
||
|
|
return (UInt32)mOutputFormatList.size();
|
||
|
|
}
|
||
|
|
|
||
|
|
void ACBaseCodec::GetSupportedOutputFormats(AudioStreamBasicDescription* outOutputFormats, UInt32& ioNumberOutputFormats) const
|
||
|
|
{
|
||
|
|
UInt32 theNumberFormats = (UInt32)mOutputFormatList.size();
|
||
|
|
ioNumberOutputFormats = (theNumberFormats < ioNumberOutputFormats) ? theNumberFormats : ioNumberOutputFormats;
|
||
|
|
|
||
|
|
FormatList::const_iterator theIterator = mOutputFormatList.begin();
|
||
|
|
theNumberFormats = ioNumberOutputFormats;
|
||
|
|
while((theNumberFormats > 0) && (theIterator != mOutputFormatList.end()))
|
||
|
|
{
|
||
|
|
*outOutputFormats = *theIterator;
|
||
|
|
|
||
|
|
++outOutputFormats;
|
||
|
|
--theNumberFormats;
|
||
|
|
std::advance(theIterator, 1);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void ACBaseCodec::GetCurrentOutputFormat(AudioStreamBasicDescription& outOutputFormat)
|
||
|
|
{
|
||
|
|
outOutputFormat = mOutputFormat;
|
||
|
|
}
|
||
|
|
|
||
|
|
void ACBaseCodec::SetCurrentOutputFormat(const AudioStreamBasicDescription& inOutputFormat)
|
||
|
|
{
|
||
|
|
if(!mIsInitialized)
|
||
|
|
{
|
||
|
|
mOutputFormat = inOutputFormat;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
CODEC_THROW(kAudioCodecStateError);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
UInt32 ACBaseCodec::GetMagicCookieByteSize() const
|
||
|
|
{
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
void ACBaseCodec::GetMagicCookie(void* /* outMagicCookieData */, UInt32& ioMagicCookieDataByteSize) const
|
||
|
|
{
|
||
|
|
ioMagicCookieDataByteSize = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
void ACBaseCodec::SetMagicCookie(const void* /* outMagicCookieData */, UInt32 /* inMagicCookieDataByteSize */)
|
||
|
|
{
|
||
|
|
if(mIsInitialized)
|
||
|
|
{
|
||
|
|
CODEC_THROW(kAudioCodecStateError);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void ACBaseCodec::AddInputFormat(const AudioStreamBasicDescription& inInputFormat)
|
||
|
|
{
|
||
|
|
FormatList::iterator theIterator = std::find(mInputFormatList.begin(), mInputFormatList.end(), inInputFormat);
|
||
|
|
if(theIterator == mInputFormatList.end())
|
||
|
|
{
|
||
|
|
theIterator = std::lower_bound(mInputFormatList.begin(), mInputFormatList.end(), inInputFormat);
|
||
|
|
mInputFormatList.insert(theIterator, inInputFormat);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void ACBaseCodec::AddOutputFormat(const AudioStreamBasicDescription& inOutputFormat)
|
||
|
|
{
|
||
|
|
FormatList::iterator theIterator = std::find(mOutputFormatList.begin(), mOutputFormatList.end(), inOutputFormat);
|
||
|
|
if(theIterator == mOutputFormatList.end())
|
||
|
|
{
|
||
|
|
theIterator = std::lower_bound(mOutputFormatList.begin(), mOutputFormatList.end(), inOutputFormat);
|
||
|
|
mOutputFormatList.insert(theIterator, inOutputFormat);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
OSType ACBaseCodec::GetSubType()
|
||
|
|
{
|
||
|
|
if (!mCodecSubType)
|
||
|
|
{
|
||
|
|
AudioComponentDescription desc = GetComponentDescription();
|
||
|
|
mCodecSubType = desc.componentSubType;
|
||
|
|
}
|
||
|
|
return mCodecSubType;
|
||
|
|
}
|