// init EAS midi
EAS_RESULT initEAS()
{
EAS_RESULT result;
// get the library configuration
pLibConfig = EAS_Config();
if (pLibConfig == NULL || pLibConfig->libVersion != LIB_VERSION)
return EAS_FAILURE;
// calculate buffer size
bufferSize = pLibConfig->mixBufferSize * pLibConfig->numChannels *
NUM_BUFFERS;
// init library
if ((result = EAS_Init(&pEASData)) != EAS_SUCCESS)
return result;
// select reverb preset and enable
EAS_SetParameter(pEASData, EAS_MODULE_REVERB, EAS_PARAM_REVERB_PRESET,
EAS_PARAM_REVERB_CHAMBER);
EAS_SetParameter(pEASData, EAS_MODULE_REVERB, EAS_PARAM_REVERB_BYPASS,
EAS_FALSE);
// open midi stream
if (result = EAS_OpenMIDIStream(pEASData, &midiHandle, NULL) !=
EAS_SUCCESS)
return result;
return EAS_SUCCESS;
}
status_t MidiEngine::allocateBuffers() {
// select reverb preset and enable
EAS_SetParameter(mEasData, EAS_MODULE_REVERB, EAS_PARAM_REVERB_PRESET, EAS_PARAM_REVERB_CHAMBER);
EAS_SetParameter(mEasData, EAS_MODULE_REVERB, EAS_PARAM_REVERB_BYPASS, EAS_FALSE);
mGroup = new MediaBufferGroup;
int bufsize = sizeof(EAS_PCM)
* mEasConfig->mixBufferSize * mEasConfig->numChannels * NUM_COMBINE_BUFFERS;
ALOGV("using %d byte buffer", bufsize);
mGroup->add_buffer(new MediaBuffer(bufsize));
return OK;
}
MidiFile::MidiFile() :
mEasData(NULL), mEasHandle(NULL), mAudioBuffer(NULL),
mPlayTime(-1), mDuration(-1), mState(EAS_STATE_ERROR),
mStreamType(AUDIO_STREAM_MUSIC), mLoop(false), mExit(false),
mPaused(false), mRender(false), mTid(-1)
{
ALOGV("constructor");
mFileLocator.path = NULL;
mFileLocator.fd = -1;
mFileLocator.offset = 0;
mFileLocator.length = 0;
// get the library configuration and do sanity check
if (pLibConfig == NULL)
pLibConfig = EAS_Config();
if ((pLibConfig == NULL) || (LIB_VERSION != pLibConfig->libVersion)) {
ALOGE("EAS library/header mismatch");
goto Failed;
}
// initialize EAS library
if (EAS_Init(&mEasData) != EAS_SUCCESS) {
ALOGE("EAS_Init failed");
goto Failed;
}
// select reverb preset and enable
EAS_SetParameter(mEasData, EAS_MODULE_REVERB, EAS_PARAM_REVERB_PRESET, EAS_PARAM_REVERB_CHAMBER);
EAS_SetParameter(mEasData, EAS_MODULE_REVERB, EAS_PARAM_REVERB_BYPASS, EAS_FALSE);
// create playback thread
{
Mutex::Autolock l(mMutex);
mThread = new MidiFileThread(this);
mThread->run("midithread", ANDROID_PRIORITY_AUDIO);
mCondition.wait(mMutex);
ALOGV("thread started");
}
// indicate success
if (mTid > 0) {
ALOGV(" render thread(%d) started", mTid);
mState = EAS_STATE_READY;
}
Failed:
return;
}
// midi init
MIDI_RESULT MIDI_Init()
{
EAS_RESULT result;
// get the library configuration
pLibConfig = EAS_Config();
if ((pLibConfig == NULL) || (pLibConfig->libVersion != LIB_VERSION))
return MIDI_FAILURE;
// init library
if ((result = EAS_Init(&pEASData)) != EAS_SUCCESS)
return result;
// select reverb preset and enable
EAS_SetParameter(pEASData, EAS_MODULE_REVERB, EAS_PARAM_REVERB_PRESET,
EAS_PARAM_REVERB_CHAMBER);
EAS_SetParameter(pEASData, EAS_MODULE_REVERB, EAS_PARAM_REVERB_BYPASS,
EAS_FALSE);
// open pcm stream
if ((result = snd_pcm_open(&handle, device,
SND_PCM_STREAM_PLAYBACK, 0)) < 0)
return result;
// set stream parameters: 16bit, interleaved, channels and sample
// rate from the EAS config and 50ms latency
if ((result = snd_pcm_set_params(handle, SND_PCM_FORMAT_S16,
SND_PCM_ACCESS_RW_INTERLEAVED,
pLibConfig->numChannels,
pLibConfig->sampleRate,
1, 50000)) < 0)
return result;
// calculate buffer size in samples
bufferSize = pLibConfig->mixBufferSize * pLibConfig->numChannels *
NUM_BUFFERS;
// allocate buffer in bytes
buffer = malloc(bufferSize * sizeof(EAS_PCM));
// clear flag
flag = FALSE;
// start rendering thread
pthread_create(&thread, NULL, render, NULL);
return MIDI_SUCCESS;
}