libstagefright: Make it possible to skip OMX buffer reallocation

Some devices don't like the call to setParameter() at this point, so
skip this call if enough buffers are already allocated. This check
was present in KitKat but got removed when code to allocate extra-
buffers was introduced.

This is activated only for omap4 for now.

Conflicts:
	media/libstagefright/Android.mk
	media/libstagefright/OMXCodec.cpp

media/libstagefright/ACodec.cpp

@@ -1052,6 +1052,12 @@ status_t ACodec::configureOutputBuffersFromNativeWindow(
     // 2. try to allocate two (2) additional buffers to reduce starvation from
     //    the consumer
     //    plus an extra buffer to account for incorrect minUndequeuedBufs
+#ifdef BOARD_CANT_REALLOCATE_OMX_BUFFERS
+    // Some devices don't like to set OMX_IndexParamPortDefinition at this
+    // point (even with an unmodified def), so skip it if possible.
+    // This check was present in KitKat.
+    if (def.nBufferCountActual < def.nBufferCountMin + *minUndequeuedBuffers) {
+#endif
     for (OMX_U32 extraBuffers = 2 + 1; /* condition inside loop */; extraBuffers--) {
         OMX_U32 newBufferCount =
             def.nBufferCountMin + *minUndequeuedBuffers + extraBuffers;
@@ -1071,6 +1077,9 @@ status_t ACodec::configureOutputBuffersFromNativeWindow(
             return err;
         }
     }
+#ifdef BOARD_CANT_REALLOCATE_OMX_BUFFERS
+    }
+#endif
 
     err = native_window_set_buffer_count(
             mNativeWindow.get(), def.nBufferCountActual);

media/libstagefright/Android.mk

@@ -130,6 +130,10 @@ ifneq (,$(filter userdebug eng,$(TARGET_BUILD_VARIANT)))
 LOCAL_CFLAGS += -DENABLE_STAGEFRIGHT_EXPERIMENTS
 endif
 
+ifeq ($(TARGET_BOARD_PLATFORM),omap4)
+LOCAL_CFLAGS := -DBOARD_CANT_REALLOCATE_OMX_BUFFERS
+endif
+
 LOCAL_CLANG := true
 LOCAL_SANITIZE := unsigned-integer-overflow signed-integer-overflow