FFmpeg(13)

一.包含头文件和库文件

CMakeLists

1target_link_libraries( # Specifies the target library.
2                       native-lib
3                       OpenSLES
4
5                       # Links the target library to the log library
6                       # included in the NDK.
7                       ${log-lib} )

代码

1#include <SLES/OpenSLES.h>
2#include <SLES/OpenSLES_Android.h>

二.示例代码

1#include <jni.h>
2#include <string>
3#include <android/log.h>
4#include <SLES/OpenSLES.h>
5#include <SLES/OpenSLES_Android.h>
6
7
8#define LOG_TAG "xp.chen"
9#ifdef LOG_TAG
10    #define LOGI(...)  __android_log_print(ANDROID_LOG_INFO,LOG_TAG,__VA_ARGS__)
11    #define LOGE(...)  __android_log_print(ANDROID_LOG_ERROR,LOG_TAG,__VA_ARGS__)
12    #define LOGV(...)  __android_log_print(ANDROID_LOG_VERBOSE,LOG_TAG,__VA_ARGS__)
13#else
14    #define LOGI(...)
15    #define LOGE(...)
16    #define LOGV(...)
17#endif
18
19
20static SLObjectItf engineSL = NULL;
21SLEngineItf CreateSL()
22{
23    SLresult ret;
24    SLEngineItf en;
25    // 创建引擎
26    ret = slCreateEngine(&engineSL, 0, 0, 0, 0, 0);
27    if (ret != SL_RESULT_SUCCESS) {
28        LOGE("slCreateEngine() failed ");
29        return NULL;
30    }
31    // 实例化
32    ret = (*engineSL)->Realize(engineSL, SL_BOOLEAN_FALSE);
33    if (ret != SL_RESULT_SUCCESS) {
34        LOGE("Realize failed");
35        return NULL;
36    }
37    // 获取接口
38    ret = (*engineSL)->GetInterface(engineSL, SL_IID_ENGINE, &en);
39    if (ret != SL_RESULT_SUCCESS) {
40        LOGE("GetInterface failed");
41        return NULL;
42    }
43    return en;
44}
45
46
47extern "C" JNIEXPORT jstring
48JNICALL
49Java_com_yuneec_yongdaimi_testopensl_MainActivity_stringFromJNI(
50        JNIEnv *env,
51        jobject /* this */) {
52    std::string hello = "Hello from C++";
53    // 创建引擎
54    SLEngineItf eng = CreateSL();
55    if (eng) {
56        LOGI("CreateSL success");
57    } else {
58        LOGE("CreateSL failed");
59    }
60    // 创建混音器
61    SLObjectItf mix = NULL;
62    SLresult ret = 0;
63    ret = (*eng)->CreateOutputMix(eng, &mix, 0, 0, 0);
64    if (ret != SL_RESULT_SUCCESS) {
65        LOGE("CreateOutputMix failed");
66    }
67    ret = (*mix)->Realize(mix, SL_BOOLEAN_FALSE);
68    if (ret != SL_BOOLEAN_FALSE) {
69        LOGE("(*mix)->Realize failed!");
70    }
71    SLDataLocator_OutputMix outmix = {SL_DATALOCATOR_OUTPUTMIX, mix};
72    SLDataSink audioSink = {&outmix, 0};
73
74    return env->NewStringUTF(hello.c_str());
75}