thanks for your response, as we have data in YUV format, so we use GL_LUMINANCE texture to transmit the YUV data to the GPU, then convert the YUV data to RGB data in the GPU. we have found that it costs nearly 40 ms to display a 600*300 video frame. My question is: 1) I think the YUV to RGB convertion should not occupy the CPU time, as it is completed in the GPU. but seems that it also blocks the CPU? 2) if the first answer is no, then transmit the 600*300 YUV data to GPU cost 40 ms?
2010/11/2 cybice <[email protected]>: > Why do you need opengl for video output? > > glTexImage2D is really slow - but you can improve performance of > video app > if render more than one video frames into one data buffer, > so one call to glTexImage2D will pass to opengl subsystem more than > one videoframe > and then you can change video frames at opengl by switching texture > coordinate attribute (see glVertexAttribPointer) > Try another configs in config chooser it can be faster, try default > config. > Reduce video resolution. > Why for VIDEO you use GL_TEXTURE_WRAP_S, try GL_CLAMP_TO_EDGE > Why GL_LUMINANCE - do you really need luminance texture or this way > you say to subsystem that you need 16bit texture? > > > > > > > On Oct 31, 9:13 am, 袁堂夫 <[email protected]> wrote: >> Hi,how are you? >> We use Opengl 2.0 to develop a video programme on android with nexus one. >> We find that the fuction glTexImage2D is too slow,but we write a >> shader programme accord to the sample GL2JNILib. >> I guess the GPU is not working, why it happened? how to fix it? >> help me,please.Thank you very much. >> ----------------------some important code--------------------------- >> VideoView(Context context) >> { >> super(context); >> // m_Activity=(hello)context; >> m_AndroidHolder = getHolder(); >> m_AndroidHolder.addCallback(this); >> m_AndroidHolder.setType(SurfaceHolder.SURFACE_TYPE_GPU); >> m_AndroidHolder.setFormat(PixelFormat.RGB_565); >> . >> . >> .} >> ------------------------------ >> public void initEGL() >> { >> mEGL = (EGL10)EGLContext.getEGL(); >> mGLDisplay = mEGL.eglGetDisplay(EGL10.EGL_DEFAULT_DISPLAY); >> int[] curGLVersion = new int[2]; >> mEGL.eglInitialize(mGLDisplay, curGLVersion); >> ConfigChooser configChooser= new ConfigChooser(5, 6, 5, 0, 0, 0); >> mGLConfig = configChooser.chooseConfig(mEGL,mGLDisplay); >> mGLSurface = mEGL.eglCreateWindowSurface(mGLDisplay, >> mGLConfig,m_View.m_AndroidHolder, null); >> int[] attrib_list = {0x3098, 2, EGL10.EGL_NONE }; >> mGLContext = mEGL.eglCreateContext(mGLDisplay, mGLConfig, >> EGL10.EGL_NO_CONTEXT, attrib_list); >> mEGL.eglMakeCurrent(mGLDisplay, mGLSurface, mGLSurface, mGLContext); >> } >> ------------------------------ >> glActiveTexture ( GL_TEXTURE0 ); >> glBindTexture ( GL_TEXTURE_2D, userData.textureId[0] ); >> glUniform1i ( userData.samplerLocY, 0); >> >> glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR); >> >> glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR); >> glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, >> GL_CLAMP_TO_EDGE); >> glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, >> GL_CLAMP_TO_EDGE); >> glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, width, height, 0, >> GL_LUMINANCE, GL_UNSIGNED_BYTE, pict->data[0]); > > -- > You received this message because you are subscribed to the Google > Groups "Android Developers" group. > To post to this group, send email to [email protected] > To unsubscribe from this group, send email to > [email protected] > For more options, visit this group at > http://groups.google.com/group/android-developers?hl=en -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
