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POOn iOS4.0 play yuv420 fails, but on iOS5.0 success
 

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  1. POOn iOS4.0 play yuv420 fails, but on iOS5.0 success
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    <p>On iOS5.0 video captured from camera with the codes as following can play well,</p> <pre><code> glActiveTexture(GL_TEXTURE0); CVReturn err = CVOpenGLESTextureCacheCreateTextureFromImage(kCFAllocatorDefault, videoTextureCache, pixelBuffer, NULL, GL_TEXTURE_2D, GL_RED_EXT, videoWidth, videoHeight, GL_RED_EXT, GL_UNSIGNED_BYTE, 0, &amp;lumaTexture); if (!lumaTexture || err) { NSLog(@"CVOpenGLESTextureCacheCreateTextureFromImage failed (error: %d)", err); return; } glBindTexture(CVOpenGLESTextureGetTarget(lumaTexture), CVOpenGLESTextureGetName(lumaTexture)); // Set texture parameters glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_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); glActiveTexture(GL_TEXTURE1); err = CVOpenGLESTextureCacheCreateTextureFromImage(kCFAllocatorDefault, videoTextureCache, pixelBuffer, NULL, GL_TEXTURE_2D, GL_RG_EXT, videoWidth / 2, videoHeight / 2, GL_RG_EXT, GL_UNSIGNED_BYTE, 1, &amp;chromaTexture); if (!chromaTexture || err) { NSLog(@"CVOpenGLESTextureCacheCreateTextureFromImage failed (error: %d)", err); return; } glBindTexture(CVOpenGLESTextureGetTarget(chromaTexture), CVOpenGLESTextureGetName(chromaTexture)); // Set texture parameters glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_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); </code></pre> <p>On iOS4.0 the following codes works well,</p> <pre><code> CVPixelBufferLockBaseAddress(pixelBuffer, 0); void * baseAddress = CVPixelBufferGetBaseAddressOfPlane(pixelBuffer,0); glActiveTexture(GL_TEXTURE0); glBindTexture(GL_TEXTURE_2D, spriteTexture[0]); glTexImage2D(GL_TEXTURE_2D, 0, GL_RED_EXT, videoWidth, videoHeight, 0, GL_RED_EXT, GL_UNSIGNED_BYTE, baseAddress); 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); void *baseAddress1 = CVPixelBufferGetBaseAddressOfPlane(pixelBuffer,1); glActiveTexture(GL_TEXTURE1); glBindTexture(GL_TEXTURE_2D, spriteTexture[1]); glTexImage2D(GL_TEXTURE_2D, 0, GL_RG_EXT, videoWidth / 2, videoHeight / 2, 0, GL_RG_EXT, GL_UNSIGNED_BYTE,baseAddress1); 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); CVPixelBufferUnlockBaseAddress(pixelBuffer, 0); </code></pre> <p>But when play video read from local mp4 file the second methods fails,and the first works well, it is very strange, I am delusive. Then how to fix it? and why this happened? </p>
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