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Diffstat (limited to 'AVStream/avssamp/wave.h')
| -rw-r--r-- | AVStream/avssamp/wave.h | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/AVStream/avssamp/wave.h b/AVStream/avssamp/wave.h new file mode 100644 index 00000000..d8546e3e --- /dev/null +++ b/AVStream/avssamp/wave.h @@ -0,0 +1,192 @@ +/************************************************************************** + + AVStream Filter-Centric Sample + + Copyright (c) 1999 - 2001, Microsoft Corporation + + File: + + wave.h + + Abstract: + + Wave object header. + + History: + + Created 6/28/01 + +**************************************************************************/ + +// +// The CWaveObject is a class which will parse PCM wave files, read the +// data, and expose the data in a loop. This allows the sample to "synthesize" +// audio data by using any PCM wave file the user wishes. +// +class CWaveObject { + +private: + + // + // The wave format. + // + WAVEFORMATEX m_WaveFormat; + + // + // The wave data. + // + PUCHAR m_WaveData; + + // + // The size of the wave data. + // + ULONG m_WaveSize; + + // + // The filename for the wave file. This string must be constant and + // static over the lifetime of the wave object. + // + PWCHAR m_FileName; + + // + // The time we have synthesized to. + // + LONGLONG m_SynthesisTime; + + // + // The pointer into the wave data that we have synthesized to. + // + ULONG m_WavePointer; + + // + // ParseBlock(): + // + // Parse the wave file, starting at the specified location, until the + // specified block has been found. The pointer will be updated to + // point to the block data and the amount of data in the block will + // be returned in a variable. + // + NTSTATUS + ParseForBlock ( + IN HANDLE FileHandle, + IN ULONG BlockHeader, + IN OUT PLARGE_INTEGER BlockPointer, + OUT PULONG BlockSize + ); + +public: + + // + // CWaveObject(): + // + // Construct a new wave object using the specified file name. + // + CWaveObject ( + _In_ LPWSTR FileName + ) : + m_FileName (FileName) + { + m_WaveData = NULL; + } + + // + // ~CWaveObject(): + // + // Destroy a wave object. + // + ~CWaveObject ( + ); + + // + // ParseAndRead(): + // + // Parse the wave file and read it into an internally allocated buffer + // inside the wave object. This is preparation to synthesize looped + // audio based on the wave. + // + NTSTATUS + ParseAndRead ( + ); + + // + // WriteRange(): + // + // Given the address of a KSDATARANGE_AUDIO, write out a range which + // matches exactly the specifications of the wave we're using to + // synthesize audio data. + // + // The GUIDs must be filled out already. This only fills out the + // channel, bps, and freq fields. + // + void + WriteRange ( + PKSDATARANGE_AUDIO AudioRange + ); + + // + // SynthesizeTo(): + // + // Given a specific stream time, synthesize from the current stream time + // (assume 0) to the supplied stream time. + // + ULONG + SynthesizeTo ( + IN LONGLONG StreamTime, + IN PVOID Data, + IN ULONG BufferSize + ); + + // + // SynthesizeFixed(): + // + // Given a specific amount of time, synthesize forward in time that + // particular amount. Units expressed in 100nS increments. + // + ULONG + SynthesizeFixed ( + IN LONGLONG TimeDelta, + IN PVOID Data, + IN ULONG BufferSize + ); + + // + // SkipFixed(): + // + // Given a specific amount of time, skip forward in time that + // particular amount. Units expressed in 100nS increments. + // + void + SkipFixed ( + IN LONGLONG TimeDelta + ); + + // + // Reset(): + // + // Reset the synthesis time and block pointers. This will cause the + // clock with respect to this wave object to go to zero. + // + void + Reset ( + ) + { + m_WavePointer = 0; + m_SynthesisTime = 0; + } + + // + // Cleanup(): + // + // This is a bag cleanup callback. It merely deletes the wave object + // instead of letting the default of ExFreePool free it. + // + static + void + Cleanup ( + IN CWaveObject *This + ) + { + delete This; + } + +}; |