ijksdl: align buffer of overlay

ijkmediaplayer/jni/ijksdl/android/android_nativewindow.c

@@ -112,13 +112,13 @@ static int android_render_rgb_on_rgb(ANativeWindow_Buffer *out_buffer, const SDL
 
     if (dst_line_size == src_line_size) {
         int plane_size = src_line_size * min_height;
-        // ALOGE("android_render_rgb_on_rgb %p %p %d", dst_pixels, src_pixels, plane_size);
+        // ALOGE("android_render_rgb_on_rgb (pix-match) %p %p %d", dst_pixels, src_pixels, plane_size);
         memcpy(dst_pixels, src_pixels, plane_size);
     } else {
         // TODO: padding
         int bytewidth = IJKMIN(dst_line_size, src_line_size);
 
-        // ALOGE("android_render_rgb_on_rgb %p %d %p %d %d %d", dst_pixels, dst_line_size, src_pixels, src_line_size, bytewidth, min_height);
+        // ALOGE("android_render_rgb_on_rgb (pix-mismatch) %p %d %p %d %d %d", dst_pixels, dst_line_size, src_pixels, src_line_size, bytewidth, min_height);
         av_image_copy_plane(dst_pixels, dst_line_size, src_pixels, src_line_size, bytewidth, min_height);
     }
 

ijkmediaplayer/jni/ijksdl/ffmpeg/ijksdl_vout_overlay_ffmpeg.c

@@ -120,8 +120,6 @@ SDL_VoutOverlay *SDL_VoutFFmpeg_CreateOverlay(int width, int height, Uint32 form
         return NULL;
     }
 
-    width = IJKALIGN(width, 32);
-
     SDL_VoutOverlay_Opaque *opaque = overlay->opaque;
     overlay->format = format;
     overlay->pitches = opaque->pitches;
@@ -131,21 +129,24 @@ SDL_VoutOverlay *SDL_VoutFFmpeg_CreateOverlay(int width, int height, Uint32 form
 
     enum AVPixelFormat ff_format = AV_PIX_FMT_NONE;
     int planes = 0;
-    int buf_width = width;
+    int buf_width = width;  // must be aligned to 16 bytes pitch for arm-neon image-convert
     int buf_height = height;
     switch (format) {
     case SDL_FCC_YV12: {
         ff_format = AV_PIX_FMT_YUV420P;
+        buf_width = IJKALIGN(width, 16); // 1 bytes per pixel for Y-plane
         planes = 3;
         break;
     }
     case SDL_FCC_RV16: {
         ff_format = AV_PIX_FMT_RGB565;
+        buf_width = IJKALIGN(width, 8); // 2 bytes per pixel
         planes = 1;
         break;
     }
     case SDL_FCC_RV32: {
         ff_format = AV_PIX_FMT_0BGR32;
+        buf_width = IJKALIGN(width, 4); // 4 bytes per pixel
         planes = 1;
         break;
     }