eglstream传输
时间: 2023-11-22 17:47:56 浏览: 164
EGLStream是一种用于在GPU和其他设备之间传输图像和视频流的机制。下面是一个简单的EGLStream传输的例子:
```python
import cv2
import numpy as np
import ctypes
import time
# Load the EGL library
_libEGL = ctypes.cdll.LoadLibrary('libEGL.so')
# Define the EGLStream attributes
EGL_STREAM_FIFO_LENGTH_KHR = 0x31FC
EGL_STREAM_FIFO_SYNCHRONOUS_NV = 0x3336
# Define the EGLStream functions
_eglGetPlatformDisplayEXT = _libEGL.eglGetPlatformDisplayEXT
_eglCreateStreamKHR = _libEGL.eglCreateStreamKHR
_eglStreamAttribKHR = _libEGL.eglStreamAttribKHR
_eglQueryStreamKHR = _libEGL.eglQueryStreamKHR
_eglStreamConsumerGLTextureExternalKHR = _libEGL.eglStreamConsumerGLTextureExternalKHR
_eglStreamConsumerAcquireKHR = _libEGL.eglStreamConsumerAcquireKHR
_eglStreamConsumerReleaseKHR = _libEGL.eglStreamConsumerReleaseKHR
_eglDestroyStreamKHR = _libEGL.eglDestroyStreamKHR
# Define the EGL constants
EGL_PLATFORM_GBM_KHR = 0x31D7
EGL_NO_STREAM_KHR = 0
# Define the EGLStream variables
stream = EGL_NO_STREAM_KHR
display = None
texture_id = None
# Define the EGLStream functions
def init_egl_stream():
global stream, display, texture_id
display = _eglGetPlatformDisplayEXT(EGL_PLATFORM_GBM_KHR, None, None)
_libEGL.eglInitialize(display, None, None)
_libEGL.eglBindAPI(12445)
stream = _eglCreateStreamKHR(display, None)
_eglStreamAttribKHR(display, stream, EGL_STREAM_FIFO_LENGTH_KHR, 1)
_eglStreamAttribKHR(display, stream, EGL_STREAM_FIFO_SYNCHRONOUS_NV, 1)
_libEGL.eglQueryStreamKHR(display, stream, 0x3238, ctypes.byref(texture_id))
_eglStreamConsumerGLTextureExternalKHR(display, stream, texture_id)
def release_egl_stream():
global stream, display
_eglDestroyStreamKHR(display, stream)
_libEGL.eglTerminate(display)
def acquire_frame():
global stream, display
_eglStreamConsumerAcquireKHR(display, stream)
return True
def release_frame():
global stream, display
_eglStreamConsumerReleaseKHR(display, stream)
# Initialize the EGLStream
init_egl_stream()
# Open the camera
cap = cv2.VideoCapture(0)
# Loop through the frames
while True:
# Capture a frame from the camera
ret, frame = cap.read()
# Convert the frame to RGBA
rgba = cv2.cvtColor(frame, cv2.COLOR_BGR2RGBA)
# Acquire the EGLStream frame
acquire_frame()
# Copy the frame to the EGLStream texture
glBindTexture(GL_TEXTURE_EXTERNAL_OES, texture_id)
glTexImage2D(GL_TEXTURE_EXTERNAL_OES, 0, GL_RGBA, rgba.shape[1], rgba.shape[0], 0, GL_RGBA, GL_UNSIGNED_BYTE, rgba)
# Release the EGLStream frame
release_frame()
# Release the EGLStream
release_egl_stream()
```
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