import win32event import mmap import array shared_memory_name Global O

  • Anonymous
  • Python
  • 26 Aug 2019 
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import win32event

import mmap

import array

shared_memory_name  = "Global\\OBSFRAME"

texture1_mutex_name = "Global\\OBSTEXTURE1_MUTEX"

texture2_mutex_name = "Global\\OBSTEXTURE2_MUTEX"

texture_ready_name = "Global\\OBSTEXTURE_READY"



META_INFO_SIZE=(1024)

TEXTURE_SIZE=(45 * 1024 * 1024)

TEXTURE_1_OFFSET=META_INFO_SIZE

TEXTURE_2_OFFSET=(TEXTURE_SIZE + TEXTURE_1_OFFSET)

SHARED_MEMORY_SIZE = TEXTURE_2_OFFSET + TEXTURE_SIZE



def getdata(memory, offset, size):

    return array.array('b', memory[offset:offset+size])

def getmeta(memory):

    return array.array('L', memory[0:16])

INFINITY = 4294967295

sharedmemory =  mmap.mmap(0, SHARED_MEMORY_SIZE, shared_memory_name, mmap.ACCESS_READ)

texture1_mutex = win32event.OpenMutex(win32event.SYNCHRONIZE, False, texture1_mutex_name)

texture2_mutex = win32event.OpenMutex(win32event.SYNCHRONIZE, False, texture2_mutex_name)

texture_ready_event = win32event.OpenEvent(win32event.SYNCHRONIZE, False, texture_ready_name);



while True:

    if win32event.WAIT_OBJECT_0 == win32event.WaitForSingleObject(texture_ready_event, -1):

        meta = getmeta(sharedmemory)

        data = array.array('L')

        data_size = meta[0]*meta[1]*4

        print('start')

        if meta[3] == 1:

            if win32event.WaitForSingleObject(texture1_mutex, 0) == win32event.WAIT_OBJECT_0:

                print('texture 1')

                data = getdata(sharedmemory, TEXTURE_1_OFFSET, data_size)

                win32event.ReleaseMutex(texture1_mutex)

            elif win32event.WaitForSingleObject(texture2_mutex, 0) == win32event.WAIT_OBJECT_0:

                print('texture 2')

                data = getdata(sharedmemory, TEXTURE_2_OFFSET, data_size)

                win32event.ReleaseMutex(texture2_mutex)

        elif meta[3] == 2:

            if win32event.WaitForSingleObject(texture2_mutex, 0) == win32event.WAIT_OBJECT_0:

                print('texture 1')

                data = getdata(sharedmemory, TEXTURE_2_OFFSET, data_size)

                win32event.ReleaseMutex(texture2_mutex)

            elif win32event.WaitForSingleObject(texture1_mutex, 0) == win32event.WAIT_OBJECT_0:

                print('texture 2')

                data = getdata(sharedmemory, TEXTURE_1_OFFSET, data_size)

                win32event.ReleaseMutex(texture1_mutex)

        print('end')

        print(meta)
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