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opensles.c
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opensles.c
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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* This is an OpenAL backend for Android using the native audio APIs based on OpenSL ES 1.0.1.
* It is based on source code for the native-audio sample app bundled with NDK.
*/
#include <stdlib.h>
#include <time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <dlfcn.h>
#include "alMain.h"
#include "AL/al.h"
#include "AL/alc.h"
#include <pthread.h>
#include <sched.h>
#include <sys/prctl.h>
#include <jni.h>
#define LOG_NDEBUG 0
#define LOG_TAG "OpenAL_SLES"
#if 1
#define LOGV(...) __android_log_print(ANDROID_LOG_INFO, LOG_TAG, __VA_ARGS__)
#else
#define LOGV(...)
#endif
// for native audio
#include <SLES/OpenSLES.h>
#include <SLES/OpenSLES_Android.h>
#include "apportable_openal_funcs.h"
#define MAKE_SYM_POINTER(sym) static typeof(sym) * p##sym = NULL
MAKE_SYM_POINTER(SL_IID_ENGINE);
MAKE_SYM_POINTER(SL_IID_ANDROIDSIMPLEBUFFERQUEUE);
MAKE_SYM_POINTER(SL_IID_PLAY);
MAKE_SYM_POINTER(SL_IID_BUFFERQUEUE);
MAKE_SYM_POINTER(slCreateEngine);
// engine interfaces
static SLObjectItf engineObject = NULL;
static SLEngineItf engineEngine;
// output mix interfaces
static SLObjectItf outputMixObject = NULL;
// JNI stuff so we can get the runtime OS version number
static JavaVM* javaVM = NULL;
static int alc_opensles_get_android_api()
{
jclass androidVersionClass = NULL;
jfieldID androidSdkIntField = NULL;
int androidApiLevel = 0;
JNIEnv* env = NULL;
(*javaVM)->GetEnv(javaVM, (void**)&env, JNI_VERSION_1_4);
androidVersionClass = (*env)->FindClass(env, "android/os/Build$VERSION");
if (androidVersionClass)
{
androidSdkIntField = (*env)->GetStaticFieldID(env, androidVersionClass, "SDK_INT", "I");
if (androidSdkIntField != NULL)
{
androidApiLevel = (int)((*env)->GetStaticIntField(env, androidVersionClass, androidSdkIntField));
}
(*env)->DeleteLocalRef(env, androidVersionClass);
}
LOGV("API:%d", androidApiLevel);
return androidApiLevel;
}
static char *androidModel = NULL;
static char *alc_opensles_get_android_model()
{
if (!androidModel) {
jclass androidBuildClass = NULL;
jfieldID androidModelField = NULL;
jstring androidModelString = NULL;
int androidApiLevel = 0;
JNIEnv* env = NULL;
(*javaVM)->GetEnv(javaVM, (void**)&env, JNI_VERSION_1_4);
(*env)->PushLocalFrame(env, 5);
androidBuildClass = (*env)->FindClass(env, "android/os/Build");
if (androidBuildClass)
{
androidModelField = (*env)->GetStaticFieldID(env, androidBuildClass, "MODEL", "Ljava/lang/String;");
androidModelString = (*env)->GetStaticObjectField(env, androidBuildClass, androidModelField);
const char *unichars = (*env)->GetStringUTFChars(env, androidModelString, NULL);
if (!(*env)->ExceptionOccurred(env))
{
jsize sz = (*env)->GetStringLength(env, androidModelString);
androidModel = malloc(sz+1);
if (androidModel) {
strncpy(androidModel, unichars, sz);
androidModel[sz] = '\0';
}
}
(*env)->ReleaseStringUTFChars(env, androidModelString, unichars);
}
(*env)->PopLocalFrame(env, NULL);
}
LOGV("Model:%s", androidModel);
return androidModel;
}
static long timespecdiff(struct timespec *starttime, struct timespec *finishtime)
{
long msec;
msec=(finishtime->tv_sec-starttime->tv_sec)*1000;
msec+=(finishtime->tv_nsec-starttime->tv_nsec)/1000000;
return msec;
}
// Cannot be a constant because we need to tweak differently depending on OS version.
static size_t bufferCount = 8;
static size_t bufferSize = (1024*4);
static size_t defaultBufferSize = (1024*4);
static size_t premixCount = 3;
#define bufferSizeMax (1024*4)
typedef enum {
OUTPUT_BUFFER_STATE_UNKNOWN,
OUTPUT_BUFFER_STATE_FREE,
OUTPUT_BUFFER_STATE_MIXED,
OUTPUT_BUFFER_STATE_ENQUEUED,
} outputBuffer_state_t;
typedef struct outputBuffer_s {
pthread_mutex_t mutex;
pthread_cond_t cond;
outputBuffer_state_t state;
char buffer[bufferSizeMax];
} outputBuffer_t;
// Will dynamically create the number of buffers (array elements) based on OS version.
typedef struct {
pthread_t playbackThread;
char threadShouldRun;
char threadIsReady;
char lastBufferEnqueued;
char lastBufferMixed;
outputBuffer_t *outputBuffers;
// buffer queue player interfaces
SLObjectItf bqPlayerObject;
SLPlayItf bqPlayerPlay;
SLAndroidSimpleBufferQueueItf bqPlayerBufferQueue;
} opesles_data_t;
#define MAX_DEVICES 3
static ALCdevice *deviceList[MAX_DEVICES] = {NULL};
static pthread_mutex_t deviceListMutex = PTHREAD_MUTEX_INITIALIZER;
typedef void (*deviceListFn)(ALCdevice *);
static void devlist_add(ALCdevice *pDevice) {
int i;
pthread_mutex_lock(&(deviceListMutex));
for (i = 0; i < MAX_DEVICES; i++) {
if (deviceList[i] == pDevice) {
break;
} else if (deviceList[i] == NULL) {
deviceList[i] = pDevice;
break;
}
}
pthread_mutex_unlock(&(deviceListMutex));
}
static void devlist_remove(ALCdevice *pDevice) {
int i;
pthread_mutex_lock(&(deviceListMutex));
for (i = 0; i < MAX_DEVICES; i++) {
if (deviceList[i] == pDevice) {
deviceList[i] = NULL;
}
}
pthread_mutex_unlock(&(deviceListMutex));
}
static void devlist_process(deviceListFn mapFunction) {
int i;
pthread_mutex_lock(&(deviceListMutex));
for (i = 0; i < MAX_DEVICES; i++) {
if (deviceList[i]) {
pthread_mutex_unlock(&(deviceListMutex));
mapFunction(deviceList[i]);
pthread_mutex_lock(&(deviceListMutex));
}
}
pthread_mutex_unlock(&(deviceListMutex));
}
static void *playback_function(void * context) {
LOGV("playback_function started");
outputBuffer_t *buffer = NULL;
SLresult result;
struct timespec ts;
assert(NULL != context);
ALCdevice *pDevice = (ALCdevice *) context;
opesles_data_t *devState = (opesles_data_t *) pDevice->ExtraData;
unsigned int bufferIndex = devState->lastBufferMixed;
ALint frameSize = FrameSizeFromDevFmt(pDevice->FmtChans, pDevice->FmtType);
// Show a sensible name for the thread in debug tools
prctl(PR_SET_NAME, (unsigned long)"OpenAL/sl/m", 0, 0, 0);
while (1) {
if (devState->threadShouldRun == 0) {
return NULL;
}
bufferIndex = (++bufferIndex) % bufferCount;
buffer = &(devState->outputBuffers[bufferIndex]);
pthread_mutex_lock(&(buffer->mutex));
while (1) {
if (devState->threadShouldRun == 0) {
pthread_mutex_unlock(&(buffer->mutex));
return NULL;
}
// This is a little hacky, but here we avoid mixing too much data
if (buffer->state == OUTPUT_BUFFER_STATE_FREE) {
int i = (bufferIndex - premixCount) % bufferCount;
outputBuffer_t *buffer1 = &(devState->outputBuffers[i]);
if (buffer1->state == OUTPUT_BUFFER_STATE_ENQUEUED ||
buffer1->state == OUTPUT_BUFFER_STATE_FREE) {
break;
}
}
// No buffer available, wait for a buffer to become available
// or until playback is stopped/suspended
clock_gettime(CLOCK_REALTIME, &ts);
ts.tv_nsec += 5000000;
pthread_cond_timedwait(&(buffer->cond), &(buffer->mutex), &ts);
}
devState->threadIsReady = 1;
aluMixData(pDevice, buffer->buffer, bufferSize/frameSize);
buffer->state = OUTPUT_BUFFER_STATE_MIXED;
pthread_cond_signal(&(buffer->cond));
pthread_mutex_unlock(&(buffer->mutex));
devState->lastBufferMixed = bufferIndex;
}
}
SLresult alc_opensles_init_extradata(ALCdevice *pDevice)
{
opesles_data_t *devState = NULL;
int i;
devState = malloc(sizeof(opesles_data_t));
if (!devState) {
return SL_RESULT_MEMORY_FAILURE;
}
bzero(devState, sizeof(opesles_data_t));
devState->outputBuffers = (outputBuffer_t*) malloc(sizeof(outputBuffer_t)*bufferCount);
if (!devState->outputBuffers) {
free(devState);
return SL_RESULT_MEMORY_FAILURE;
}
pDevice->ExtraData = devState;
bzero(devState->outputBuffers, sizeof(outputBuffer_t)*bufferCount);
devState->lastBufferEnqueued = -1;
devState->lastBufferMixed = -1;
for (i = 0; i < bufferCount; i++) {
if (pthread_mutex_init(&(devState->outputBuffers[i].mutex), (pthread_mutexattr_t*) NULL) != 0) {
LOGV("Error on init of mutex");
free(devState->outputBuffers);
free(devState);
return SL_RESULT_UNKNOWN_ERROR;
}
if (pthread_cond_init(&(devState->outputBuffers[i].cond), (pthread_condattr_t*) NULL) != 0) {
LOGV("Error on init of cond");
free(devState->outputBuffers);
free(devState);
return SL_RESULT_UNKNOWN_ERROR;
}
devState->outputBuffers[i].state = OUTPUT_BUFFER_STATE_FREE;
}
// For the Android suspend/resume functionaly, keep track of all device contexts
devlist_add(pDevice);
return SL_RESULT_SUCCESS;
}
static void start_playback(ALCdevice *pDevice) {
opesles_data_t *devState = NULL;
int i;
if (pDevice->ExtraData == NULL) {
alc_opensles_init_extradata(pDevice);
devState = pDevice->ExtraData;
assert(devState != NULL);
} else {
devState = (opesles_data_t *) pDevice->ExtraData;
}
if (devState->threadShouldRun == 1) {
// Gratuitous resume
return;
}
// start/restart playback thread
devState->threadShouldRun = 1;
pthread_attr_t playbackThreadAttr;
pthread_attr_init(&playbackThreadAttr);
struct sched_param playbackThreadParam;
playbackThreadParam.sched_priority = sched_get_priority_max(SCHED_RR);
pthread_attr_setschedpolicy(&playbackThreadAttr, SCHED_RR);
pthread_attr_setschedparam(&playbackThreadAttr, &playbackThreadParam);
pthread_create(&(devState->playbackThread), &playbackThreadAttr, playback_function, (void *) pDevice);
while (devState->threadShouldRun && (0 == devState->threadIsReady))
{
sched_yield();
}
}
static void stop_playback(ALCdevice *pDevice) {
opesles_data_t *devState = (opesles_data_t *) pDevice->ExtraData;
devState->threadShouldRun = 0;
pthread_join(devState->playbackThread, NULL);
return;
}
// this callback handler is called every time a buffer finishes playing
static void opensles_callback(SLAndroidSimpleBufferQueueItf bq, void *context)
{
ALCdevice *pDevice = (ALCdevice *) context;
opesles_data_t *devState = (opesles_data_t *) pDevice->ExtraData;
unsigned int bufferIndex = devState->lastBufferEnqueued;
unsigned int i;
struct timespec ts;
int rc;
SLresult result;
outputBuffer_t *buffer = NULL;
bufferIndex = (++bufferIndex) % bufferCount;
buffer = &(devState->outputBuffers[bufferIndex]);
pthread_mutex_lock(&(buffer->mutex));
// We will block until 'next' buffer has mixed audio, but first flag oldest equeued buffer as free
for (i = 1; i <= bufferCount; i++) {
unsigned int j = (devState->lastBufferEnqueued+i) % bufferCount;
outputBuffer_t *bufferFree = &(devState->outputBuffers[j]);
if (bufferFree->state == OUTPUT_BUFFER_STATE_ENQUEUED) {
bufferFree->state = OUTPUT_BUFFER_STATE_FREE;
break;
}
}
while (buffer->state != OUTPUT_BUFFER_STATE_MIXED) {
clock_gettime(CLOCK_REALTIME, &ts);
ts.tv_nsec += 100000;
rc = pthread_cond_timedwait(&(buffer->cond), &(buffer->mutex), &ts);
if (rc != 0) {
if (devState->threadShouldRun == 0) {
// we are probably suspended
pthread_mutex_unlock(&(buffer->mutex));
return;
}
}
}
if (devState->bqPlayerBufferQueue) {
result = (*devState->bqPlayerBufferQueue)->Enqueue(devState->bqPlayerBufferQueue, buffer->buffer, bufferSize);
if (SL_RESULT_SUCCESS == result) {
buffer->state = OUTPUT_BUFFER_STATE_ENQUEUED;
devState->lastBufferEnqueued = bufferIndex;
pthread_cond_signal(&(buffer->cond));
} else {
bufferIndex--;
}
}
pthread_mutex_unlock(&(buffer->mutex));
}
static const ALCchar opensles_device[] = "OpenSL ES";
// Apportable extensions
SLresult alc_opensles_create_native_audio_engine()
{
if (engineObject)
return SL_RESULT_SUCCESS;
SLresult result;
// create engine
result = pslCreateEngine(&engineObject, 0, NULL, 0, NULL, NULL);
assert(SL_RESULT_SUCCESS == result);
// realize the engine
result = (*engineObject)->Realize(engineObject, SL_BOOLEAN_FALSE);
assert(SL_RESULT_SUCCESS == result);
// get the engine interface, which is needed in order to create other objects
result = (*engineObject)->GetInterface(engineObject, *pSL_IID_ENGINE, &engineEngine);
assert(SL_RESULT_SUCCESS == result);
// create output mix
result = (*engineEngine)->CreateOutputMix(engineEngine, &outputMixObject, 0, NULL, NULL);
assert(SL_RESULT_SUCCESS == result);
// realize the output mix
result = (*outputMixObject)->Realize(outputMixObject, SL_BOOLEAN_FALSE);
assert(SL_RESULT_SUCCESS == result);
return result;
}
// Backend functions, in same order as type BackendFuncs
static ALCboolean opensles_open_playback(ALCdevice *pDevice, const ALCchar *deviceName)
{
LOGV("opensles_open_playback pDevice=%p, deviceName=%s", pDevice, deviceName);
// Check if probe has linked the opensl symbols
if (pslCreateEngine == NULL) {
alc_opensles_probe(DEVICE_PROBE);
if (pslCreateEngine == NULL) {
return ALC_FALSE;
}
}
if (pDevice->ExtraData == NULL) {
alc_opensles_init_extradata(pDevice);
}
// create the engine and output mix objects
alc_opensles_create_native_audio_engine();
return ALC_TRUE;
}
static void opensles_close_playback(ALCdevice *pDevice)
{
LOGV("opensles_close_playback pDevice=%p", pDevice);
opesles_data_t *devState = (opesles_data_t *) pDevice->ExtraData;
// shut down the native audio system
// destroy buffer queue audio player object, and invalidate all associated interfaces
if (devState->bqPlayerObject != NULL) {
(*devState->bqPlayerObject)->Destroy(devState->bqPlayerObject);
devState->bqPlayerObject = NULL;
devState->bqPlayerPlay = NULL;
devState->bqPlayerBufferQueue = NULL;
}
devlist_remove(pDevice);
}
static ALCboolean opensles_reset_playback(ALCdevice *pDevice)
{
if (pDevice == NULL) {
LOGE("Received a NULL ALCdevice! Returning ALC_FALSE from opensles_reset_playback");
return ALC_FALSE;
}
LOGV("opensles_reset_playback pDevice=%p", pDevice);
opesles_data_t *devState;
unsigned bits = BytesFromDevFmt(pDevice->FmtType) * 8;
unsigned channels = ChannelsFromDevFmt(pDevice->FmtChans);
unsigned samples = pDevice->UpdateSize;
unsigned size = samples * channels * bits / 8;
SLuint32 sampling_rate = pDevice->Frequency * 1000;
SLresult result;
LOGV("bits=%u, channels=%u, samples=%u, size=%u, freq=%u", bits, channels, samples, size, pDevice->Frequency);
if (pDevice->Frequency <= 22050) {
bufferSize = defaultBufferSize / 2;
}
devState = (opesles_data_t *) pDevice->ExtraData;
// create buffer queue audio player
// configure audio source
SLDataLocator_AndroidSimpleBufferQueue loc_bufq = {SL_DATALOCATOR_ANDROIDSIMPLEBUFFERQUEUE, 2};
// SLDataFormat_PCM format_pcm = {SL_DATAFORMAT_PCM, 2, SL_SAMPLINGRATE_44_1,
SLDataFormat_PCM format_pcm = {SL_DATAFORMAT_PCM, 2, sampling_rate,
SL_PCMSAMPLEFORMAT_FIXED_16, SL_PCMSAMPLEFORMAT_FIXED_16,
SL_SPEAKER_FRONT_LEFT|SL_SPEAKER_FRONT_RIGHT, SL_BYTEORDER_LITTLEENDIAN};
SLDataSource audioSrc = {&loc_bufq, &format_pcm};
// configure audio sink
SLDataLocator_OutputMix loc_outmix = {SL_DATALOCATOR_OUTPUTMIX, outputMixObject};
SLDataSink audioSnk = {&loc_outmix, NULL};
// create audio player
LOGV("create audio player");
const SLInterfaceID ids[1] = {*pSL_IID_ANDROIDSIMPLEBUFFERQUEUE};
const SLboolean req[1] = {SL_BOOLEAN_TRUE};
result = (*engineEngine)->CreateAudioPlayer(engineEngine, &devState->bqPlayerObject, &audioSrc, &audioSnk,
1, ids, req);
if ((result != SL_RESULT_SUCCESS) || (devState->bqPlayerObject == NULL)) {
LOGV("create audio player is null or errored: %lx", result);
return ALC_FALSE;
}
// realize the player
result = (*devState->bqPlayerObject)->Realize(devState->bqPlayerObject, SL_BOOLEAN_FALSE);
assert(SL_RESULT_SUCCESS == result);
// get the play interface
result = (*devState->bqPlayerObject)->GetInterface(devState->bqPlayerObject, *pSL_IID_PLAY, &devState->bqPlayerPlay);
assert(SL_RESULT_SUCCESS == result);
// get the buffer queue interface
result = (*devState->bqPlayerObject)->GetInterface(devState->bqPlayerObject, *pSL_IID_BUFFERQUEUE,
&devState->bqPlayerBufferQueue);
if ((result != SL_RESULT_SUCCESS) || (devState->bqPlayerBufferQueue == NULL)) {
LOGV("get the buffer queue interface is null or errored: %lx", result);
return ALC_FALSE;
}
// register callback on the buffer queue
result = (*devState->bqPlayerBufferQueue)->RegisterCallback(devState->bqPlayerBufferQueue, opensles_callback, (void *) pDevice);
assert(SL_RESULT_SUCCESS == result);
// playback_lock = createThreadLock();
start_playback(pDevice);
// set the player's state to playing
result = (*devState->bqPlayerPlay)->SetPlayState(devState->bqPlayerPlay, SL_PLAYSTATE_PLAYING);
assert(SL_RESULT_SUCCESS == result);
// enqueue the first buffer to kick off the callbacks
result = (*devState->bqPlayerBufferQueue)->Enqueue(devState->bqPlayerBufferQueue, "\0", 1);
assert(SL_RESULT_SUCCESS == result);
SetDefaultWFXChannelOrder(pDevice);
devlist_add(pDevice);
return ALC_TRUE;
}
static void opensles_stop_playback(ALCdevice *pDevice)
{
LOGV("opensles_stop_playback device=%p", pDevice);
stop_playback(pDevice);
}
static ALCboolean opensles_open_capture(ALCdevice *pDevice, const ALCchar *deviceName)
{
LOGV("opensles_open_capture device=%p, deviceName=%s", pDevice, deviceName);
return ALC_FALSE;
}
static void opensles_close_capture(ALCdevice *pDevice)
{
LOGV("opensles_closed_capture device=%p", pDevice);
}
static void opensles_start_capture(ALCdevice *pDevice)
{
LOGV("opensles_start_capture device=%p", pDevice);
}
static void opensles_stop_capture(ALCdevice *pDevice)
{
LOGV("opensles_stop_capture device=%p", pDevice);
}
static void opensles_capture_samples(ALCdevice *pDevice, ALCvoid *pBuffer, ALCuint lSamples)
{
LOGV("opensles_capture_samples device=%p, pBuffer=%p, lSamples=%u", pDevice, pBuffer, lSamples);
}
static ALCuint opensles_available_samples(ALCdevice *pDevice)
{
LOGV("opensles_available_samples device=%p", pDevice);
return 0;
}
// table of backend function pointers
BackendFuncs opensles_funcs = {
opensles_open_playback,
opensles_close_playback,
opensles_reset_playback,
opensles_stop_playback,
opensles_open_capture,
opensles_close_capture,
opensles_start_capture,
opensles_stop_capture,
opensles_capture_samples,
opensles_available_samples
};
// global entry points called from XYZZY
static void suspend_device(ALCdevice *pDevice) {
SLresult result;
if (pDevice) {
opesles_data_t *devState = (opesles_data_t *) pDevice->ExtraData;
if (devState->bqPlayerPlay) {
result = (*devState->bqPlayerPlay)->SetPlayState(devState->bqPlayerPlay, SL_PLAYSTATE_PAUSED);
if ((SL_RESULT_SUCCESS == result) && (devState->bqPlayerBufferQueue)) {
result = (*devState->bqPlayerBufferQueue)->Clear(devState->bqPlayerBufferQueue);
assert(SL_RESULT_SUCCESS == result);
}
}
stop_playback(pDevice);
}
}
static void resume_device(ALCdevice *pDevice) {
SLresult result;
if (pDevice) {
opesles_data_t *devState = (opesles_data_t *) pDevice->ExtraData;
if (devState->bqPlayerPlay) {
result = (*devState->bqPlayerPlay)->SetPlayState(devState->bqPlayerPlay, SL_PLAYSTATE_PLAYING);
// Pump some blank data into the buffer to stimulate the callback
if ((SL_RESULT_SUCCESS == result) && (devState->bqPlayerBufferQueue)) {
result = (*devState->bqPlayerBufferQueue)->Enqueue(devState->bqPlayerBufferQueue, "\0", 1);
assert(SL_RESULT_SUCCESS == result);
}
}
start_playback(pDevice);
}
}
void alc_opensles_suspend()
{
devlist_process(&suspend_device);
}
void alc_opensles_resume()
{
devlist_process(&resume_device);
}
static void alc_opensles_set_java_vm(JavaVM *vm)
{
// Called once and only once from JNI_OnLoad
javaVM = vm;
int i;
char *android_model;
char *low_buffer_models[] = {
"GT-I9300",
"GT-I9305",
"SHV-E210",
"SGH-T999",
"SGH-I747",
"SGH-N064",
"SC-06D",
"SGH-N035",
"SC-03E",
"SCH-R530",
"SCH-I535",
"SPH-L710",
"GT-I9308",
"SCH-I939",
"Kindle Fire",
NULL};
if(NULL != javaVM)
{
int android_os_version = alc_opensles_get_android_api();
// If running on 4.1 (Jellybean) or later, use 8 buffers to avoid breakup/stuttering.
if(android_os_version >= 16)
{
premixCount = 5;
}
// Else, use 4 buffers to reduce latency
else
{
premixCount = 1;
}
android_model = alc_opensles_get_android_model();
for (i = 0; low_buffer_models[i] != NULL; i++) {
if (strncmp(android_model, low_buffer_models[i], strlen(low_buffer_models[i])) == 0) {
LOGV("Using less buffering");
defaultBufferSize = 1024;
bufferSize = 1024;
premixCount = 1;
break;
}
}
}
}
void alc_opensles_init(BackendFuncs *func_list)
{
LOGV("alc_opensles_init");
struct stat statinfo;
if (stat("/system/lib/libOpenSLES.so", &statinfo) != 0) {
return;
}
*func_list = opensles_funcs;
// We need the JavaVM for JNI so we can detect the OS version number at runtime.
// This is because we need to use different bufferCount values for Android 4.1 vs. pre-4.1.
// This must be set at constructor time before JNI_OnLoad is invoked.
apportableOpenALFuncs.alc_android_set_java_vm = alc_opensles_set_java_vm;
}
void alc_opensles_deinit(void)
{
LOGV("alc_opensles_deinit");
// destroy output mix object, and invalidate all associated interfaces
if (outputMixObject != NULL) {
(*outputMixObject)->Destroy(outputMixObject);
outputMixObject = NULL;
}
// destroy engine object, and invalidate all associated interfaces
if (engineObject != NULL) {
(*engineObject)->Destroy(engineObject);
engineObject = NULL;
engineEngine = NULL;
}
}
void alc_opensles_probe(int type)
{
char *error;
struct stat statinfo;
if (stat("/system/lib/libOpenSLES.so", &statinfo) != 0) {
LOGV("alc_opensles_probe OpenSLES support not found.");
return;
}
dlerror(); // Clear dl errors
void *dlHandle = dlopen("/system/lib/libOpenSLES.so", RTLD_NOW | RTLD_GLOBAL);
if (!dlHandle || (error = (typeof(error))dlerror()) != NULL) {
LOGV("OpenSLES could not be loaded.");
return;
}
#define LOAD_SYM_POINTER(sym) \
do { \
p##sym = dlsym(dlHandle, #sym); \
if((error=(typeof(error))dlerror()) != NULL) { \
LOGV("alc_opensles_probe could not load %s, error: %s", #sym, error); \
dlclose(dlHandle); \
return; \
} \
} while(0)
LOAD_SYM_POINTER(slCreateEngine);
LOAD_SYM_POINTER(SL_IID_ENGINE);
LOAD_SYM_POINTER(SL_IID_ANDROIDSIMPLEBUFFERQUEUE);
LOAD_SYM_POINTER(SL_IID_PLAY);
LOAD_SYM_POINTER(SL_IID_BUFFERQUEUE);
apportableOpenALFuncs.alc_android_suspend = alc_opensles_suspend;
apportableOpenALFuncs.alc_android_resume = alc_opensles_resume;
switch (type) {
case DEVICE_PROBE:
LOGV("alc_opensles_probe DEVICE_PROBE");
AppendDeviceList(opensles_device);
break;
case ALL_DEVICE_PROBE:
LOGV("alc_opensles_probe ALL_DEVICE_PROBE");
AppendAllDeviceList(opensles_device);
break;
default:
LOGV("alc_opensles_probe type=%d", type);
break;
}
}