// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40285824): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
// The file defines the symbols from OpenSLES that android is using. It then
// loads the library dynamically on first use.
// The openSLES API is using constant as part of the API. This file will define
// proxies for those constants and redefine those when the library is first
// loaded. For this, it need to be able to change their content and so import
// the headers without const. This is correct because OpenSLES.h is a C API.
// We include stdint.h here as a workaround for an issue caused by the
// #define const below. The inclusion of OpenSLES headers on newer Android NDK
// versions causes stdint.h to be included, which in turn includes __config.
// This causes the declaration of __sanitizer_annotate_contiguous_container to
// not use const parameters, which causes compile issues when building with
// asan. Including here forces __config to be included while const is still
// untouched.
#include <stdint.h>
#include "base/memory/raw_ptr.h"
#define const
#include <SLES/OpenSLES.h>
#include <SLES/OpenSLES_Android.h>
#undef const
#include <stddef.h>
#include "base/files/file_path.h"
#include "base/logging.h"
#include "base/native_library.h"
// The constants used in chromium. SLInterfaceID is actually a pointer to
// SLInterfaceID_. Those symbols are defined as extern symbols in the OpenSLES
// headers. They will be initialized to their correct values when the library is
// loaded.
SLInterfaceID SL_IID_ENGINE = NULL;
SLInterfaceID SL_IID_ANDROIDSIMPLEBUFFERQUEUE = NULL;
SLInterfaceID SL_IID_ANDROIDCONFIGURATION = NULL;
SLInterfaceID SL_IID_RECORD = NULL;
SLInterfaceID SL_IID_BUFFERQUEUE = NULL;
SLInterfaceID SL_IID_VOLUME = NULL;
SLInterfaceID SL_IID_PLAY = NULL;
namespace {
// The name of the library to load.
const char kOpenSLLibraryName[] = "libOpenSLES.so";
// Loads the OpenSLES library, and initializes all the proxies.
base::NativeLibrary IntializeLibraryHandle() {
base::NativeLibrary handle =
base::LoadNativeLibrary(base::FilePath(kOpenSLLibraryName), NULL);
if (!handle) {
DLOG(ERROR) << "Unable to load " << kOpenSLLibraryName;
return NULL;
}
// Setup the proxy for each symbol.
// Attach the symbol name to the proxy address.
struct SymbolDefinition {
const char* name;
raw_ptr<SLInterfaceID> sl_iid;
};
// The list of defined symbols.
const SymbolDefinition kSymbols[] = {
{"SL_IID_ENGINE", &SL_IID_ENGINE},
{"SL_IID_ANDROIDSIMPLEBUFFERQUEUE", &SL_IID_ANDROIDSIMPLEBUFFERQUEUE},
{"SL_IID_ANDROIDCONFIGURATION", &SL_IID_ANDROIDCONFIGURATION},
{"SL_IID_RECORD", &SL_IID_RECORD},
{"SL_IID_BUFFERQUEUE", &SL_IID_BUFFERQUEUE},
{"SL_IID_VOLUME", &SL_IID_VOLUME},
{"SL_IID_PLAY", &SL_IID_PLAY}};
for (size_t i = 0; i < sizeof(kSymbols) / sizeof(kSymbols[0]); ++i) {
void* func_ptr =
base::GetFunctionPointerFromNativeLibrary(handle, kSymbols[i].name);
if (!func_ptr) {
DLOG(ERROR) << "Unable to find symbol for " << kSymbols[i].name;
return NULL;
}
memcpy(kSymbols[i].sl_iid, func_ptr, sizeof(SLInterfaceID));
}
return handle;
}
// Returns the handler to the shared library. The library itself will be lazily
// loaded during the first call to this function.
base::NativeLibrary LibraryHandle() {
// The handle is lazily initialized on the first call.
static base::NativeLibrary g_handle = IntializeLibraryHandle();
return g_handle;
}
} // namespace
// Redefine slCreateEngine symbol.
SLresult slCreateEngine(SLObjectItf* engine,
SLuint32 num_options,
SLEngineOption* engine_options,
SLuint32 num_interfaces,
SLInterfaceID* interface_ids,
SLboolean* interfaces_required) {
typedef SLresult (*SlCreateEngineSignature)(SLObjectItf*, SLuint32,
SLEngineOption*, SLuint32,
SLInterfaceID*, SLboolean*);
base::NativeLibrary handle = LibraryHandle();
if (!handle)
return SL_RESULT_INTERNAL_ERROR;
static SlCreateEngineSignature g_sl_create_engine_handle =
reinterpret_cast<SlCreateEngineSignature>(
base::GetFunctionPointerFromNativeLibrary(handle, "slCreateEngine"));
if (!g_sl_create_engine_handle) {
DLOG(ERROR) << "Unable to find symbol for slCreateEngine";
return SL_RESULT_INTERNAL_ERROR;
}
return g_sl_create_engine_handle(engine, num_options, engine_options,
num_interfaces, interface_ids,
interfaces_required);
}
Codebase Browser
chromium