ios: gles: correct alignment of gles texture

ijkmedia/ijksdl/ffmpeg/ijksdl_vout_overlay_ffmpeg.c

@@ -144,13 +144,22 @@ SDL_VoutOverlay *SDL_VoutFFmpeg_CreateOverlay(int width, int height, Uint32 form
     overlay->h = height;
 
     enum AVPixelFormat ff_format = AV_PIX_FMT_NONE;
-    int buf_width = width;  // must be aligned to 16 bytes pitch for arm-neon image-convert
+    int buf_width = width;
     int buf_height = height;
     switch (format) {
     case SDL_FCC_I420:
     case SDL_FCC_YV12: {
         ff_format = AV_PIX_FMT_YUV420P;
+        // FIXME: need runtime config
+#if defined(__ANDROID__)
+        // 16 bytes align pitch for arm-neon image-convert
         buf_width = IJKALIGN(width, 16); // 1 bytes per pixel for Y-plane
+#elif defined(__APPLE__)
+        // 2^n align for width
+        buf_width  = 1 << (sizeof(int) * 8 - __builtin_clz(width));
+#else
+        buf_width = IJKALIGN(width, 16); // unknown platform
+#endif
         opaque->planes = 3;
         break;
     }

ios/IJKMediaPlayer/IJKMediaPlayer/ijkmedia/ijksdl/ios/IJKSDLGLRenderI420.m

@@ -86,8 +86,8 @@ static NSString *const g_yuvFragmentShaderString = IJK_SHADER_STRING
     if (0 == _textures[0])
         glGenTextures(3, _textures);
 
-    const UInt8 *pixels[3] = {overlay->pixels[0], overlay->pixels[1], overlay->pixels[2]};
-    const NSUInteger widths[3]  = { frameWidth, frameWidth / 2, frameWidth / 2 };
+    const UInt8 *pixels[3] = { overlay->pixels[0], overlay->pixels[1], overlay->pixels[2] };
+    const NSUInteger widths[3]  = { overlay->pitches[0], overlay->pitches[1], overlay->pitches[2] };
     const NSUInteger heights[3] = { frameHeight, frameHeight / 2, frameHeight / 2 };
 
     for (int i = 0; i < 3; ++i) {