Of the three types of LOAS, only AudioSyncStream is supported. 3: Audio transport stream with a synchronization layer (LOAS) and a multiplex layer (LATM).Only one raw_data_block() per adts_frame() is allowed. The stream contains an adts_sequence(), as defined by MPEG-2. The stream contains raw_data_block() elements only, as defined by MPEG-2. The decoder supports the following payload types: If unknown, set to zero or 0xFE ("no audio profile specified").Īpplies only to MFAudioFormat_AAC. The value of this attribute is the audioProfileLevelIndication field, as defined by ISO/IEC 14496-3. Refer to the previous description for details. To configure the AAC decoder, set the following attributes on the input media type. For this subtype, the media type gives the sample rate and number of channels after the SBR and PS tools are applied, if present. This subtype is used for AAC contained in an AVI file with the audio format tag equal to WAVE_FORMAT_RAW_AAC1 (0x00FF). The MPEG-4 File Source and the ADTS Parser output this subtype. This subtype is equivalent to MEDIASUBTYPE_MPEG_HEAAC, defined in wmcodecdsp.h. The effect of the PS tool is to decode stereo from a mono-channel core AAC-LC stream. The effect of the SBR tool is to double the decoded sample rate relative to the core AAC-LC sample rate. For this subtype, the media type gives the sample rate and number of channels prior to the application of spectral band replication (SBR) and parametric stereo (PS) tools, if present. The AAC decoder supports the following audio subtypes: Subtype The AAC decoder supports the following media types. The class identifier (CLSID) of the AAC encoder is CLSID_CMSAACDecMFT, defined in the header file wmcodecdsp.h. It can also convert an LATM/LOAS stream to ADTS. Starting in Windows 8, the AAC decoder also supports decoding MPEG-4 audio transport streams with a multiplex layer (LATM) and synchronization layer (LOAS). The AAC decoder supports both raw AAC streams with no headers and AAC in an audio data transport stream (ADTS). MPEG-4 HE-AAC v2 (stereo) with AAC-LC core.MPEG-4 HE-AAC v1 (multichannel) with AAC-LC core.MPEG-2 AAC Low Complexity (LC) profile (multichannel).The Microsoft Media Foundation AAC decoder is a Media Foundation Transform that decodes the following Advanced Audio Coding (AAC) and High Efficiency AAC (HE-AAC) profiles:
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