![]() ![]() Show takes place in modern or modern-ish times, usually the not-so-distant past.The important qualifications of this trope are as follows: This isn't Zeerust, which is about futuristic tech becoming old rather than about modern tech becoming old. have relatively recently become either so little-used as to be obscure, or obsolete altogether. You see, technology has marched on, and things like CD-ROMs, VHS cassette tapes, etc. In one episode, the characters are all excited because of a new computer game that will be released very soon. Where nAudioSamplesPerChannel is the number of PCM audio samples per channel in the input buffer, and nSamplesPerSec is the sampling rate, in samples per second.So little Timmy is watching a show from the 1990s. ( nAudioSamplesPerChannel * (LONGLONG)10000000 )/nSamplesPerSec ![]() Sample duration can be calculated as follows: LONGLONG hnsSampleDuration = If the sample duration is not set, the ProcessInput method returns MF_E_NO_SAMPLE_DURATION. If the sample time is not set, the encoder's IMFTransform::ProcessInput method returns MF_E_NO_SAMPLE_TIMESTAMP. To set the sample duration, call IMFSample::SetSampleDuration. ![]() To set the sample time, call IMFSample::SetSampleTime. In the current implementation, every input sample must have a valid time and duration. Here is an example of the media types needed to encode from 44.1-kHz, 160-Kbps stereo audio to raw AAC If MF_MT_AAC_PAYLOAD_TYPE is zero (the default value), each output sample contains one raw_data_block() element as defined by ISO/IEC 13818-7. ![]() For example, at 48 Khz sampling rate, the duration of one compressed frame is 21.33 msec. The MF_MT_AAC_PAYLOAD_TYPE attribute, if present in the output type, must be set to zero to indicate this payload type.Įach output sample contains one compressed AAC frame corresponding to 1024 PCM samples. This format is equivalent to the raw_data_block() element defined by MPEG-2. This is followed by the AudioSpecificConfig() data, as defined by ISO/IEC 14496-3.Įach output sample contains one compressed AAC frame with no header. This attribute contains the portion of the HEAACWAVEINFO structure that appears after the WAVEFORMATEX structure (that is, after the wfx member). MF_MT_AAC_PROFILE_LEVEL_INDICATION valueĪfter the output type is set, the AAC encoder updates the type by adding the MF_MT_USER_DATA attribute. The following table lists the values that can be used for the MF_MT_AAC_PROFILE_LEVEL_INDICATION attribute. Starting in Windows 8, the value can be 0 (raw AAC) or 1 (ADTS AAC). In Windows 7, if this attribute is set, the value must be zero. If the attribute is not set, the default value is zero, indicating that the stream contains raw_data_block elements only (raw AAC). If set, the value must be zero, indicating that the stream contains raw_data_block elements only. The default value for 6 channels is 60000. The default value for both mono and stereo is 12000 (96 Kbps). If using 6 channels, multiply these values by 6. Attributeīit rate of the encoded AAC stream, in bytes per second. Set the following attributes on the output media type. Note: Support for 6 audio channels was introduced with Windows 10 and is not available for earlier versions of Windows.Īfter the input type is set, the encoder derives the following values and adds them to the media type: Set the following attributes on the input media type. You can set the types in either order input type first, or output type first. The AAC encoder supports the following media types. The class identifier (CLSID) of the AAC encoder is CLSID_AACMFTEncoder, defined in the header file wmcodecdsp.h. The AAC encoder does not support encoding to any other AAC profiles, such as Main, SSR, or LTP. The Microsoft Media Foundation AAC encoder is a Media Foundation Transform that encodes Advanced Audio Coding (AAC) Low Complexity (LC) profile, as defined by ISO/IEC 13818-7 (MPEG-2 Audio Part 7). ![]()
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