1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
|
// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// 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.
#define const
#include <SLES/OpenSLES.h>
#include <SLES/OpenSLES_Android.h>
#undef const
#include "base/basictypes.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);
DCHECK(handle) << "Unable to load " << kOpenSLLibraryName;
// Setup the proxy for each symbol.
// Attach the symbol name to the proxy address.
struct SymbolDefinition {
const char* name;
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) {
memcpy(kSymbols[i].sl_iid,
base::GetFunctionPointerFromNativeLibrary(handle, kSymbols[i].name),
sizeof(SLInterfaceID));
DCHECK(*kSymbols[i].sl_iid) << "Unable to find symbol for "
<< kSymbols[i].name;
}
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_opensles_LibraryHandle =
IntializeLibraryHandle();
return g_opensles_LibraryHandle;
}
} // 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*);
static SlCreateEngineSignature g_sl_create_engine_handle =
reinterpret_cast<SlCreateEngineSignature>(
base::GetFunctionPointerFromNativeLibrary(LibraryHandle(),
"slCreateEngine"));
DCHECK(g_sl_create_engine_handle)
<< "Unable to find symbol for slCreateEngine";
return g_sl_create_engine_handle(engine,
num_options,
engine_options,
num_interfaces,
interface_ids,
interfaces_required);
}
|
