// Oprogramowanie Roman Ryltsov
This is basically a cross-post of StackOverflow answer: How do I encode raw 48khz/32bits PCM to FLAC using Microsoft Media Foundation? So, Microsoft introduced a FLAC Media Foundation Transform (MFT) Encoder CLSID_CMSFLACEncMFT in Windows 10, but the codec remains undocumented at the moment. Supported Media Formats in Media Foundation is similarly out of date and…
Reference signal source for DirectShow in its video part already received Media Foundation Source interface earlier. This time, the update implements a separate Media Foundation source for audio. MfGenerate2 sample code gives an idea on how to initialize the source: using namespace AlaxInfoDirectShowReferenceSource; CComPtr<IAudioMediaSource> pSource; __C(pSource.CoCreateInstance(__uuidof(AudioMediaSource))); __C(pSource->SetMediaType(NULL, g_nSampleRate, g_nChannelCount, g_nBitDepth)); __C(pSource->put_Duration((DOUBLE) g_nDuration)); CComPtr<IMFMediaSource> pAudioMediaSource =…
A DirectShow developer complained on sudden failure of Core Audio IMMDevice::Activate call supposed to instantiate a DirectShow filter for a given device. The problem appeared to be related to installed DirectShowSpy and its interference with the API calls. The symptom was of the following kind: when Activate was called for different types of objects, the…
Every so often there are tasks that need certain reference video or video/audio footage with specific properties: resolution, frame rate, frame accuracy with content identifying specific frame, motion in view, amount of motion which is “hard” for processing with encoder tuned for natural video, specific video and audio synchronization. There is of course some content…
DirectShow streaming and playback in particular offers flexible playback rates for scenarios where playback is requested to take place slower or faster than real time. For a DirectShow developer, the outer interface is pretty straightforward:IMediaPosition::put_Rate takes playback rate and that’s it. Playback rate. Must not be zero. The playback rate is expressed as a ratio of…
Someone discovered the utility while browsing my public repository (the app prompts to post data back to the website, and the anonymous user accepted the offer and posted the report from this unpublished application), so I have to drop a few lines about the tool. The idea is basically straightforward: live capture involves attaching time…
The minimalistic sample demonstrates support of [deprecated] Waveform Audio API for multiple playback streams. Depending on command line parameters, the application starts threads to open audio hardware using separate waveOutOpen call and stream one or more generated sine waves: 1,000 Hz sine wave as 22,050 Hz, Mono, 16-bit PCM (command line parameter “a”) 5,000 Hz…