omxil: Add a prefix to the iomx function symbols

On some devices (apparently froyo and earlier), some OMX core
(with sw-only codecs) already is loaded into the process, and
dlsym(RTLD_DEFAULT) can just as well return functions from that
one instead of the ones from the iomx wrapper that we've loaded.

This makes sure we really get the functions we want.
Signed-off-by: Rafaël Carré <funman@videolan.org>

modules/codec/omxil/iomx.cpp

@@ -29,6 +29,8 @@
 #include <binder/MemoryDealer.h>
 #include <OMX_Component.h>
 
+#define PREFIX(x) I ## x
+
 using namespace android;
 
 class IOMXContext {
@@ -270,7 +272,8 @@ static OMX_ERRORTYPE iomx_set_config(OMX_HANDLETYPE component, OMX_INDEXTYPE ind
     return get_error(ctx->iomx->setConfig(node->node, index, param, sizeof(OMX_BOOL)));
 }
 
-OMX_ERRORTYPE OMX_GetHandle(OMX_HANDLETYPE *handle_ptr, OMX_STRING component_name, OMX_PTR app_data, OMX_CALLBACKTYPE *callbacks)
+extern "C" {
+OMX_ERRORTYPE PREFIX(OMX_GetHandle)(OMX_HANDLETYPE *handle_ptr, OMX_STRING component_name, OMX_PTR app_data, OMX_CALLBACKTYPE *callbacks)
 {
     OMXNode* node = new OMXNode();
     node->app_data = app_data;
@@ -308,7 +311,7 @@ OMX_ERRORTYPE OMX_GetHandle(OMX_HANDLETYPE *handle_ptr, OMX_STRING component_nam
     return OMX_ErrorNone;
 }
 
-OMX_ERRORTYPE OMX_FreeHandle(OMX_HANDLETYPE handle)
+OMX_ERRORTYPE PREFIX(OMX_FreeHandle)(OMX_HANDLETYPE handle)
 {
     OMXNode* node = (OMXNode*) ((OMX_COMPONENTTYPE*)handle)->pComponentPrivate;
     ctx->iomx->freeNode( node->node );
@@ -318,7 +321,7 @@ OMX_ERRORTYPE OMX_FreeHandle(OMX_HANDLETYPE handle)
     return OMX_ErrorNone;
 }
 
-OMX_ERRORTYPE OMX_Init(void)
+OMX_ERRORTYPE PREFIX(OMX_Init)(void)
 {
     OMXClient client;
     if (client.connect() != OK)
@@ -331,7 +334,7 @@ OMX_ERRORTYPE OMX_Init(void)
     return OMX_ErrorNone;
 }
 
-OMX_ERRORTYPE OMX_Deinit(void)
+OMX_ERRORTYPE PREFIX(OMX_Deinit)(void)
 {
     ctx->iomx = NULL;
     delete ctx;
@@ -339,7 +342,7 @@ OMX_ERRORTYPE OMX_Deinit(void)
     return OMX_ErrorNone;
 }
 
-OMX_ERRORTYPE OMX_ComponentNameEnum(OMX_STRING component_name, OMX_U32 name_length, OMX_U32 index)
+OMX_ERRORTYPE PREFIX(OMX_ComponentNameEnum)(OMX_STRING component_name, OMX_U32 name_length, OMX_U32 index)
 {
     if (index >= ctx->components.size())
         return OMX_ErrorNoMore;
@@ -351,7 +354,7 @@ OMX_ERRORTYPE OMX_ComponentNameEnum(OMX_STRING component_name, OMX_U32 name_leng
     return OMX_ErrorNone;
 }
 
-OMX_ERRORTYPE OMX_GetRolesOfComponent(OMX_STRING component_name, OMX_U32 *num_roles, OMX_U8 **roles)
+OMX_ERRORTYPE PREFIX(OMX_GetRolesOfComponent)(OMX_STRING component_name, OMX_U32 *num_roles, OMX_U8 **roles)
 {
     for( List<IOMX::ComponentInfo>::iterator it = ctx->components.begin(); it != ctx->components.end(); it++ ) {
         if (!strcmp(component_name, it->mName.string())) {
@@ -372,4 +375,5 @@ OMX_ERRORTYPE OMX_GetRolesOfComponent(OMX_STRING component_name, OMX_U32 *num_ro
     }
     return OMX_ErrorInvalidComponentName;
 }
+}
 

modules/codec/omxil/omxil.c

@@ -33,7 +33,7 @@
 /* On dll_open, just check that the OMX_Init symbol already is loaded */
 # define dll_open(name) dlsym(RTLD_DEFAULT, "OMX_Init")
 # define dll_close(handle) do { } while (0)
-# define dlsym(handle, name) dlsym(RTLD_DEFAULT, name)
+# define dlsym(handle, name) dlsym(RTLD_DEFAULT, "I" name)
 #else
 # define dll_open(name) dlopen( name, RTLD_NOW )
 # define dll_close(handle) dlclose(handle)