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Diffstat (limited to 'AVStream/avssamp/wave.cpp')
| -rw-r--r-- | AVStream/avssamp/wave.cpp | 598 |
1 files changed, 0 insertions, 598 deletions
diff --git a/AVStream/avssamp/wave.cpp b/AVStream/avssamp/wave.cpp deleted file mode 100644 index 7af2f60a..00000000 --- a/AVStream/avssamp/wave.cpp +++ /dev/null @@ -1,598 +0,0 @@ -/************************************************************************** - - AVStream Filter-Centric Sample - - Copyright (c) 1999 - 2001, Microsoft Corporation - - File: - - wave.cpp - - Abstract: - - Wave object implementation. - - History: - - Created 6/28/01 - -**************************************************************************/ - -#include "avssamp.h" - -/************************************************************************** - - PAGED CODE - -**************************************************************************/ - -#ifdef ALLOC_PRAGMA -#pragma code_seg("PAGE") -#endif // ALLOC_PRAGMA - - -CWaveObject:: -~CWaveObject ( - ) - -/*++ - -Routine Description: - - Destroy a wave object. - -Arguments: - - None - -Return Value: - - None - ---*/ - -{ - PAGED_CODE(); - - if (m_WaveData) { - ExFreePool (m_WaveData); - } - -} - -/*************************************************/ - - -NTSTATUS -CWaveObject:: -ParseForBlock ( - IN HANDLE FileHandle, - IN ULONG BlockHeader, - IN OUT PLARGE_INTEGER BlockPosition, - OUT PULONG BlockSize - ) - -/*++ - -Routine Description: - - Given that BlockPosition points to the offset of the start of a RIFF block, - continue parsing the specified file until a block with the header of - BlockHeader is found. Return the position of the block data and the size - of the block. - -Arguments: - - FileHandle - - Handle to the file to parse - - BlockHeader - - The block header to scan for - - BlockPosition - - INPUT : Points to the block header to start at - OUTPUT: If successful, points to the block data for the sought block - If unsuccessful, unchanged - - BlockSize - - On output, if successful -- the size of the sought block will be - placed here - -Return Value: - - Success / Failure of the search - ---*/ - -{ - - PAGED_CODE(); - - NTSTATUS Status; - ULONG FmtBlockSize = 0; - LARGE_INTEGER ReadPos = *BlockPosition; - IO_STATUS_BLOCK iosb; - - while (1) { - ULONG BlockHeaderData [2]; - - Status = ZwReadFile ( - FileHandle, - NULL, - NULL, - NULL, - &iosb, - BlockHeaderData, - sizeof (BlockHeaderData), - &ReadPos, - NULL - ); - - if (NT_SUCCESS (Status)) { - if (BlockHeaderData [0] == BlockHeader) { - FmtBlockSize = BlockHeaderData [1]; - ReadPos.QuadPart += 0x8; - break; - } else { - // - // This isn't a format block. Just ignore it. All we - // care about is the format block and the PCM data. - // - ReadPos.QuadPart += BlockHeaderData [1] + 0x8; - } - } else { - break; - } - - } - - if (FmtBlockSize == 0) { - Status = STATUS_NOT_FOUND; - } else { - *BlockPosition = ReadPos; - *BlockSize = FmtBlockSize; - } - - return Status; - -} - -/*************************************************/ - - -NTSTATUS -CWaveObject:: -ParseAndRead ( - ) - -/*++ - -Routine Description: - - Parse the wave file and read the data into an internally allocated - buffer. This prepares to synthesize audio data from the wave - object. - -Arguments: - - None - -Return Value: - - Success / Failure - - If the wave is unrecognized, unparsable, or insufficient memory - exists to allocate the internal buffer, an error code will - be returned and the object will be incapable of synthesizing - audio data based on the wave. - ---*/ - -{ - - PAGED_CODE(); - - IO_STATUS_BLOCK iosb; - UNICODE_STRING FileName; - OBJECT_ATTRIBUTES ObjectAttributes; - NTSTATUS Status; - HANDLE FileHandle = NULL; - FILE_OBJECT *FileObj; - - RtlInitUnicodeString (&FileName, m_FileName); - - InitializeObjectAttributes ( - &ObjectAttributes, - &FileName, - (OBJ_CASE_INSENSITIVE | - OBJ_KERNEL_HANDLE), - NULL, - NULL - ); - - Status = ZwCreateFile ( - &FileHandle, - GENERIC_READ | SYNCHRONIZE, - &ObjectAttributes, - &iosb, - 0, - FILE_ATTRIBUTE_NORMAL, - FILE_SHARE_READ, - FILE_OPEN, - FILE_SYNCHRONOUS_IO_NONALERT, - NULL, - 0 - ); - - if (NT_SUCCESS (Status)) { - ULONG RiffWaveHeader [3]; - - // - // Read the header: RIFF size WAVE - // - Status = ZwReadFile ( - FileHandle, - NULL, - NULL, - NULL, - &iosb, - RiffWaveHeader, - sizeof (RiffWaveHeader), - NULL, - NULL - ); - - // - // Ensure that this is a RIFF file and it's a WAVE. - // - if (NT_SUCCESS (Status)) { - - if (RiffWaveHeader [0] != 'FFIR' || - RiffWaveHeader [2] != 'EVAW') { - Status = STATUS_INVALID_PARAMETER; - } - } - } - - // - // Find the wave format block and ensure it's WAVEFORMATEX and PCM - // data. Otherwise, this can't parse the wave. - // - LARGE_INTEGER ReadPos; - ReadPos.QuadPart = 0xc; - ULONG FmtBlockSize = 0; - - if (NT_SUCCESS (Status)) { - Status = ParseForBlock (FileHandle, ' tmf', &ReadPos, &FmtBlockSize); - } - - // - // If the format block was not found, the file cannot be parsed. If the - // format block is unrecognized, the file cannot be parsed. - // - if (FmtBlockSize >= sizeof (m_WaveFormat)) { - Status = STATUS_INVALID_PARAMETER; - } - - if (NT_SUCCESS (Status)) { - Status = ZwReadFile ( - FileHandle, - NULL, - NULL, - NULL, - &iosb, - &m_WaveFormat, - FmtBlockSize, - &ReadPos, - NULL - ); - } - - if (NT_SUCCESS (Status)) { - if (m_WaveFormat.wFormatTag != WAVE_FORMAT_PCM) { - Status = STATUS_INVALID_PARAMETER; - } - } - - ReadPos.QuadPart += FmtBlockSize; - - // - // Find the data block and read it in. - // - ULONG DataBlockSize; - if (NT_SUCCESS (Status)) { - Status = ParseForBlock (FileHandle, 'atad', &ReadPos, &DataBlockSize); - } - - // - // Perform a slight validation. - // - if (NT_SUCCESS (Status) && - (DataBlockSize == 0 || - (DataBlockSize & (m_WaveFormat.nBlockAlign - 1)))) { - - Status = STATUS_INVALID_PARAMETER; - } - - // - // If we're okay so far, allocate memory for the wave data. - // - if (NT_SUCCESS (Status)) { - m_WaveData = reinterpret_cast <PUCHAR> ( - ExAllocatePoolWithTag (NonPagedPool, DataBlockSize, AVSSMP_POOLTAG) - ); - - if (!m_WaveData) { - Status = STATUS_INSUFFICIENT_RESOURCES; - } - } - - // - // Read the wave data in. - // - if (NT_SUCCESS (Status)) { - Status = ZwReadFile ( - FileHandle, - NULL, - NULL, - NULL, - &iosb, - m_WaveData, - DataBlockSize, - &ReadPos, - NULL - ); - - m_WaveSize = DataBlockSize; - } - - // - // If we failed, clean up. - // - if (!NT_SUCCESS (Status)) { - if (m_WaveData) { - ExFreePool (m_WaveData); - m_WaveData = NULL; - } - } - - if (FileHandle) { - ZwClose (FileHandle); - } - - return Status; -} - -/*************************************************/ - - -void -CWaveObject:: -WriteRange ( - OUT PKSDATARANGE_AUDIO DataRange - ) - -/*++ - -Routine Description: - - Fill out the extended portion of the audio data range at DataRange. This - includes the channel, bps, and frequency fields. - -Arguments: - - DataRange - - The data range to fill out - -Return Value: - - None - ---*/ - -{ - - PAGED_CODE(); - - DataRange -> MaximumChannels = m_WaveFormat.nChannels; - DataRange -> MinimumBitsPerSample = - DataRange -> MaximumBitsPerSample = - m_WaveFormat.wBitsPerSample; - DataRange -> MinimumSampleFrequency = - DataRange -> MaximumSampleFrequency = - m_WaveFormat.nSamplesPerSec; - - -} - -/************************************************************************** - - LOCKED CODE - -**************************************************************************/ - -#ifdef ALLOC_PRAGMA -#pragma code_seg() -#endif // ALLOC_PRAGMA - - -void -CWaveObject:: -SkipFixed ( - IN LONGLONG TimeDelta - ) - -/*++ - -Routine Description: - - Skip ahead a specific time delta within the wave. - -Arguments: - - TimeDelta - - The amount of time to skip ahead. - ---*/ - -{ - if (TimeDelta > 0) { - - // - // Compute the number of bytes of audio data necessary to move the - // stream forward TimeDelta time. Remember that TimeDelta is in - // units of 100nS. - // - ULONG Samples = (ULONG)( - (m_WaveFormat.nSamplesPerSec * TimeDelta) / 10000000 - ); - - ULONG Bytes = Samples * (m_WaveFormat.wBitsPerSample / 8) * - m_WaveFormat.nChannels; - - m_WavePointer = (m_WavePointer + Bytes) % m_WaveSize; - - m_SynthesisTime += TimeDelta; - - } - -} - - -ULONG -CWaveObject:: -SynthesizeFixed ( - IN LONGLONG TimeDelta, - IN PVOID Buffer, - IN ULONG BufferSize - ) - -/*++ - -Routine Description: - - Copy wave data from our wave block in order to synthesize forward in time - TimeDelta (in 100nS units). - -Arguments: - - TimeDelta - - The amount of time to move the stream (in 100nS increments) - - Buffer - - The buffer to synthesize into - - BufferSize - - The size of the buffer - -Return Value: - - Number of bytes synthesized. - ---*/ - -{ - - // - // If there is no time delta, return 0. - // - if (TimeDelta < 0) - return 0; - - // - // Compute the number of bytes of audio data necessary to move the stream - // forward TimeDelta time. Remember that TimeDelta is in units of 100nS. - // - ULONG Samples = (ULONG)( - (m_WaveFormat.nSamplesPerSec * TimeDelta) / 10000000 - ); - - ULONG Bytes = Samples * (m_WaveFormat.wBitsPerSample / 8) * - m_WaveFormat.nChannels; - - // - // Now that we have a specified number of bytes, we determine how many - // to really copy based on the Size of the buffer. - // - if (Bytes > BufferSize) Bytes = BufferSize; - - // - // Because the buffer is looping, this may multiple distinct copies. For - // large wave files, this may be two chunks. For small wave files, this - // may be MANY distinct chunks. - // - ULONG BytesRemaining = Bytes; - PUCHAR DataCopy = reinterpret_cast <PUCHAR> (Buffer); - - while (BytesRemaining) { - ULONG ChunkCount = m_WaveSize - m_WavePointer; - if (ChunkCount > BytesRemaining) ChunkCount = BytesRemaining; - - RtlCopyMemory ( - DataCopy, - m_WaveData + m_WavePointer, - ChunkCount - ); - - m_WavePointer += ChunkCount; - if (m_WavePointer >= m_WaveSize) m_WavePointer -= m_WaveSize; - - BytesRemaining -= ChunkCount; - DataCopy += ChunkCount; - - } - - // - // Consider that we have synthesized up to the specified time. If the - // buffer was not large enough to do this, we'll end up falling behind - // the synthesis time. This does not skip samples. - // - m_SynthesisTime += TimeDelta; - - return Bytes; - -} - - -ULONG -CWaveObject:: -SynthesizeTo ( - IN LONGLONG StreamTime, - IN PVOID Buffer, - IN ULONG BufferSize - ) - -/*++ - -Routine Description: - - Copy wave data from our wave block in order to synthesize the stream - up to the specified stream time. If the buffers are not large enough, - this will fall behind on synthesis. - -Arguments: - - StreamTime - - The time to synthesize up to - - Buffer - - The buffer to copy synthesized wave data into - - BufferSize - - The size of the buffer - -Return Value: - - The number of bytes used. - ---*/ - -{ - - LONGLONG TimeDelta = StreamTime - m_SynthesisTime; - - return SynthesizeFixed (TimeDelta, Buffer, BufferSize); - - -} - |