android - 使用 OpenSL ES 在 Android NDK 中实现 outputMixObject 会导致应用程序崩溃

Question

我正在尝试将 OpenSL ES 实现到我的项目中，但在这样做时，我的应用程序崩溃了。当我尝试通过调用它的实现方法来实现 outputMixObject 时发生错误:

// Create OutputMixer.
result = (*engineInstance)->CreateOutputMix(engineInstance, &outputMixObject, 1, NULL, NULL);
assert(result == SL_RESULT_SUCCESS);
// Realize the OutputMixer.
result = (*outputMixObject)->Realize(outputMixObject, SL_BOOLEAN_FALSE);
assert(result == SL_RESULT_SUCCESS);

当我运行应用程序进行测试时，我得到以下日志条目:

05-11 13:20:19.736: INFO/DEBUG(31): *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
05-11 13:20:19.736: INFO/DEBUG(31): Build fingerprint: 'generic/sdk/generic:2.3.1/GSI11/93351:eng/test-keys'
05-11 13:20:19.736: INFO/DEBUG(31): pid: 631, tid: 631  >>> org.test.opensl <<<
05-11 13:20:19.746: INFO/DEBUG(31): signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 00000000
05-11 13:20:19.746: INFO/DEBUG(31):  r0 00000000  r1 00000000  r2 00000000  r3 00000000
05-11 13:20:19.746: INFO/DEBUG(31):  r4 82f01bdc  r5 8380af69  r6 00000000  r7 418fccc4
05-11 13:20:19.746: INFO/DEBUG(31):  r8 bee5f428  r9 418fccbc  10 418fcca4  fp 42596f38
05-11 13:20:19.746: INFO/DEBUG(31):  ip 00000000  sp bee5f410  lr 8380af95  pc 82f009ae  cpsr 40000030
05-11 13:20:19.986: INFO/DEBUG(31):          #00  pc 000009ae  /data/data/org.test.opensl/lib/libSLAudio.so
05-11 13:20:19.986: INFO/DEBUG(31):          #01  pc 00017d34  /system/lib/libdvm.so
05-11 13:20:19.996: INFO/DEBUG(31):          #02  pc 00048ec0  /system/lib/libdvm.so
05-11 13:20:20.007: INFO/DEBUG(31):          #03  pc 00041a6a  /system/lib/libdvm.so
05-11 13:20:20.007: INFO/DEBUG(31):          #04  pc 0004e5dc  /system/lib/libdvm.so
05-11 13:20:20.016: INFO/DEBUG(31):          #05  pc 0001cf94  /system/lib/libdvm.so
05-11 13:20:20.016: INFO/DEBUG(31):          #06  pc 0002209c  /system/lib/libdvm.so
05-11 13:20:20.016: INFO/DEBUG(31):          #07  pc 00020f90  /system/lib/libdvm.so
05-11 13:20:20.016: INFO/DEBUG(31):          #08  pc 0005f50e  /system/lib/libdvm.so
05-11 13:20:20.026: INFO/DEBUG(31):          #09  pc 00066ed6  /system/lib/libdvm.so
05-11 13:20:20.026: INFO/DEBUG(31):          #10  pc 0001cf94  /system/lib/libdvm.so
05-11 13:20:20.057: INFO/DEBUG(31):          #11  pc 0002209c  /system/lib/libdvm.so
05-11 13:20:20.057: INFO/DEBUG(31):          #12  pc 00020f90  /system/lib/libdvm.so
05-11 13:20:20.057: INFO/DEBUG(31):          #13  pc 0005f360  /system/lib/libdvm.so
05-11 13:20:20.066: INFO/DEBUG(31):          #14  pc 0004b960  /system/lib/libdvm.so
05-11 13:20:20.066: INFO/DEBUG(31):          #15  pc 0003eb64  /system/lib/libdvm.so
05-11 13:20:20.066: INFO/DEBUG(31):          #16  pc 0003c15c  /system/lib/libandroid_runtime.so
05-11 13:20:20.086: INFO/DEBUG(31):          #17  pc 0003cf76  /system/lib/libandroid_runtime.so
05-11 13:20:20.086: INFO/DEBUG(31):          #18  pc 00008ca2  /system/bin/app_process
05-11 13:20:20.086: INFO/DEBUG(31):          #19  pc 00014db8  /system/lib/libc.so
05-11 13:20:20.097: INFO/DEBUG(31): code around pc:
05-11 13:20:20.106: INFO/DEBUG(31): 82f0098c 68116803 32201c22 479868db 1c216a20 
05-11 13:20:20.106: INFO/DEBUG(31): 82f0099c 68032201 31189600 230069dd 69a047a8 
05-11 13:20:20.106: INFO/DEBUG(31): 82f009ac 68032100 4798681b bd70b002 00001274 
05-11 13:20:20.116: INFO/DEBUG(31): 82f009bc 00001228 0000002c 00000002 00000001 
05-11 13:20:20.126: INFO/DEBUG(31): 82f009cc 007a1200 00000010 00000010 00000004 
05-11 13:20:20.126: INFO/DEBUG(31): code around lr:
05-11 13:20:20.136: INFO/DEBUG(31): 8380af74 29002602 2000d01e 48106008 fcf8f7fd 
05-11 13:20:20.136: INFO/DEBUG(31): 8380af84 9300ab05 9a031c39 1c049b0c fa9af7fe 
05-11 13:20:20.136: INFO/DEBUG(31): 8380af94 d10f1e06 99051c20 f7fd9a02 1e04fec3 
05-11 13:20:20.136: INFO/DEBUG(31): 8380afa4 2603d101 1c20e006 fa30f7fb f0011c20 
05-11 13:20:20.136: INFO/DEBUG(31): 8380afb4 602cf8a3 1c30b007 46c0bdf0 00001009 
05-11 13:20:20.136: INFO/DEBUG(31): stack:
05-11 13:20:20.136: INFO/DEBUG(31):     bee5f3d0  82f01bf4  /data/data/org.test.opensl/lib/libSLAudio.so
05-11 13:20:20.136: INFO/DEBUG(31):     bee5f3d4  00000002  
05-11 13:20:20.146: INFO/DEBUG(31):     bee5f3d8  00000001  
05-11 13:20:20.146: INFO/DEBUG(31):     bee5f3dc  8380af95  /system/lib/libOpenSLES.so
05-11 13:20:20.156: INFO/DEBUG(31):     bee5f3e0  bee5f3f4  
05-11 13:20:20.156: INFO/DEBUG(31):     bee5f3e4  838089b9  /system/lib/libOpenSLES.so
05-11 13:20:20.156: INFO/DEBUG(31):     bee5f3e8  0029cea4  [heap]
05-11 13:20:20.156: INFO/DEBUG(31):     bee5f3ec  00000000  
05-11 13:20:20.156: INFO/DEBUG(31):     bee5f3f0  00000000  
05-11 13:20:20.156: INFO/DEBUG(31):     bee5f3f4  82f01bfc  /data/data/org.test.opensl/lib/libSLAudio.so
05-11 13:20:20.156: INFO/DEBUG(31):     bee5f3f8  000001b4  
05-11 13:20:20.156: INFO/DEBUG(31):     bee5f3fc  82f01bdc  /data/data/org.test.opensl/lib/libSLAudio.so
05-11 13:20:20.167: INFO/DEBUG(31):     bee5f400  8380af69  /system/lib/libOpenSLES.so
05-11 13:20:20.167: INFO/DEBUG(31):     bee5f404  00000000  
05-11 13:20:20.167: INFO/DEBUG(31):     bee5f408  df002777  
05-11 13:20:20.176: INFO/DEBUG(31):     bee5f40c  e3a070ad  
05-11 13:20:20.176: INFO/DEBUG(31): #00 bee5f410  00000000  
05-11 13:20:20.176: INFO/DEBUG(31):     bee5f414  00000000  
05-11 13:20:20.176: INFO/DEBUG(31):     bee5f418  bee5f448  
05-11 13:20:20.186: INFO/DEBUG(31):     bee5f41c  00000000  
05-11 13:20:20.186: INFO/DEBUG(31):     bee5f420  43d6e7c3  /data/dalvik-cache/data@app@org.test.opensl-2.apk@classes.dex
05-11 13:20:20.186: INFO/DEBUG(31):     bee5f424  81d17d38  /system/lib/libdvm.so
05-11 13:20:20.186: INFO/DEBUG(31): #01 bee5f428  41adab28  /dev/ashmem/dalvik-LinearAlloc (deleted)
05-11 13:20:20.186: INFO/DEBUG(31):     bee5f42c  0000ce48  [heap]
05-11 13:20:20.186: INFO/DEBUG(31):     bee5f430  43d6e7c3  /data/dalvik-cache/data@app@org.test.opensl-2.apk@classes.dex
05-11 13:20:20.186: INFO/DEBUG(31):     bee5f434  bee5f508  
05-11 13:20:20.186: INFO/DEBUG(31):     bee5f438  81d17f00  /system/lib/libdvm.so
05-11 13:20:20.186: INFO/DEBUG(31):     bee5f43c  0000ce48  [heap]
05-11 13:20:20.186: INFO/DEBUG(31):     bee5f440  bee5f448  
05-11 13:20:20.186: INFO/DEBUG(31):     bee5f444  81d48ec3  /system/lib/libdvm.so

检查#00 处的程序计数器，表明地址 000009ae 处的方法导致了崩溃。将地址转换为它在我的源文件中出现的行，为我提供了 Realize(outputMixObject, SL_BOOLEAN_FALSE 方法所在的代码行。

请注意，我通过在这个问题上发布的解决方案转换了地址: How to use addr2line in Android

但是，我似乎无法理解它，这可能是由于我对 NDK 或 C/OpenSL ES 总体上缺乏经验......

我在 Android 2.3.1 模拟器上对此进行了测试。前面指定的代码在一个初始化方法中，它为我的应用程序初始化引擎:

JNIEXPORT void JNICALL Java_org_test_opensl_AudioProcessor_createEngine(JNIEnv *env, jobject thiz){
    SLresult result;
    // Create engine.
    result = slCreateEngine(&engineObject, 0, NULL, 0, NULL, NULL);
    assert(result == SL_RESULT_SUCCESS);
    // Realize the engine.
    result = (*engineObject)->Realize(engineObject, SL_BOOLEAN_FALSE);
    assert(result == SL_RESULT_SUCCESS);
    // Get the engine interface, required for the creation of all the other objects.
    result = (*engineObject)->GetInterface(engineObject, SL_IID_ENGINE, &engineInstance);
    assert(result == SL_RESULT_SUCCESS);
    // Create OutputMixer.
    result = (*engineInstance)->CreateOutputMix(engineInstance, &outputMixObject, 1, NULL, NULL);
    assert(result == SL_RESULT_SUCCESS);
    // Realize the OutputMixer.
    result = (*outputMixObject)->Realize(outputMixObject, SL_BOOLEAN_FALSE);
    assert(result == SL_RESULT_SUCCESS);
}

如果有人能阐明这一点，我们将不胜感激...

Answer 1

result = (*engineInstance)->CreateOutputMix(engineInstance, &outputMixObject, 1, NULL, NULL);

您提供 1 作为 numInterfaces 参数，并为 pInterfaceIds 参数发送 NULL 指针，这将导致在 opensl 内某处的 0x00000000 处出现段错误。