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/*
* Copyright (C) 2010 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.
*/
/* BufferQueue implementation */
#include "sles_allinclusive.h"
/** Determine the state of the audio player or audio recorder associated with a buffer queue.
* Note that PLAYSTATE and RECORDSTATE values are equivalent (where PLAYING == RECORDING).
*/
static SLuint32 getAssociatedState(IBufferQueue *thiz)
{
SLuint32 state;
switch (InterfaceToObjectID(thiz)) {
case SL_OBJECTID_AUDIOPLAYER:
state = ((CAudioPlayer *) thiz->mThis)->mPlay.mState;
break;
case SL_OBJECTID_AUDIORECORDER:
state = ((CAudioRecorder *) thiz->mThis)->mRecord.mState;
break;
default:
// unreachable, but just in case we will assume it is stopped
assert(SL_BOOLEAN_FALSE);
state = SL_PLAYSTATE_STOPPED;
break;
}
return state;
}
SLresult IBufferQueue_Enqueue(SLBufferQueueItf self, const void *pBuffer, SLuint32 size)
{
SL_ENTER_INTERFACE
//SL_LOGV("IBufferQueue_Enqueue(%p, %p, %u)", self, pBuffer, size);
// Note that Enqueue while a Clear is pending is equivalent to Enqueue followed by Clear
if (NULL == pBuffer || 0 == size) {
result = SL_RESULT_PARAMETER_INVALID;
} else {
IBufferQueue *thiz = (IBufferQueue *) self;
interface_lock_exclusive(thiz);
BufferHeader *oldRear = thiz->mRear, *newRear;
if ((newRear = oldRear + 1) == &thiz->mArray[thiz->mNumBuffers + 1]) {
newRear = thiz->mArray;
}
if (newRear == thiz->mFront) {
result = SL_RESULT_BUFFER_INSUFFICIENT;
} else {
oldRear->mBuffer = pBuffer;
oldRear->mSize = size;
thiz->mRear = newRear;
++thiz->mState.count;
result = SL_RESULT_SUCCESS;
}
// set enqueue attribute if state is PLAYING and the first buffer is enqueued
interface_unlock_exclusive_attributes(thiz, ((SL_RESULT_SUCCESS == result) &&
(1 == thiz->mState.count) && (SL_PLAYSTATE_PLAYING == getAssociatedState(thiz))) ?
ATTR_BQ_ENQUEUE : ATTR_NONE);
}
SL_LEAVE_INTERFACE
}
SLresult IBufferQueue_Clear(SLBufferQueueItf self)
{
SL_ENTER_INTERFACE
result = SL_RESULT_SUCCESS;
IBufferQueue *thiz = (IBufferQueue *) self;
interface_lock_exclusive(thiz);
#ifdef ANDROID
if (SL_OBJECTID_AUDIOPLAYER == InterfaceToObjectID(thiz)) {
CAudioPlayer *audioPlayer = (CAudioPlayer *) thiz->mThis;
// flush associated audio player
result = android_audioPlayer_bufferQueue_onClear(audioPlayer);
if (SL_RESULT_SUCCESS == result) {
thiz->mFront = &thiz->mArray[0];
thiz->mRear = &thiz->mArray[0];
thiz->mState.count = 0;
thiz->mState.playIndex = 0;
thiz->mSizeConsumed = 0;
}
}
#endif
#ifdef USE_OUTPUTMIXEXT
// mixer might be reading from the front buffer, so tread carefully here
// NTH asynchronous cancel instead of blocking until mixer acknowledges
thiz->mClearRequested = SL_BOOLEAN_TRUE;
do {
interface_cond_wait(thiz);
} while (thiz->mClearRequested);
#endif
interface_unlock_exclusive(thiz);
SL_LEAVE_INTERFACE
}
static SLresult IBufferQueue_GetState(SLBufferQueueItf self, SLBufferQueueState *pState)
{
SL_ENTER_INTERFACE
// Note that GetState while a Clear is pending is equivalent to GetState before the Clear
if (NULL == pState) {
result = SL_RESULT_PARAMETER_INVALID;
} else {
IBufferQueue *thiz = (IBufferQueue *) self;
SLBufferQueueState state;
interface_lock_shared(thiz);
#ifdef __cplusplus // FIXME Is this a compiler bug?
state.count = thiz->mState.count;
state.playIndex = thiz->mState.playIndex;
#else
state = thiz->mState;
#endif
interface_unlock_shared(thiz);
*pState = state;
result = SL_RESULT_SUCCESS;
}
SL_LEAVE_INTERFACE
}
SLresult IBufferQueue_RegisterCallback(SLBufferQueueItf self,
slBufferQueueCallback callback, void *pContext)
{
SL_ENTER_INTERFACE
IBufferQueue *thiz = (IBufferQueue *) self;
interface_lock_exclusive(thiz);
// verify pre-condition that media object is in the SL_PLAYSTATE_STOPPED state
if (SL_PLAYSTATE_STOPPED == getAssociatedState(thiz)) {
thiz->mCallback = callback;
thiz->mContext = pContext;
result = SL_RESULT_SUCCESS;
} else {
result = SL_RESULT_PRECONDITIONS_VIOLATED;
}
interface_unlock_exclusive(thiz);
SL_LEAVE_INTERFACE
}
static const struct SLBufferQueueItf_ IBufferQueue_Itf = {
IBufferQueue_Enqueue,
IBufferQueue_Clear,
IBufferQueue_GetState,
IBufferQueue_RegisterCallback
};
void IBufferQueue_init(void *self)
{
IBufferQueue *thiz = (IBufferQueue *) self;
thiz->mItf = &IBufferQueue_Itf;
thiz->mState.count = 0;
thiz->mState.playIndex = 0;
thiz->mCallback = NULL;
thiz->mContext = NULL;
thiz->mNumBuffers = 0;
thiz->mClearRequested = SL_BOOLEAN_FALSE;
thiz->mArray = NULL;
thiz->mFront = NULL;
thiz->mRear = NULL;
#ifdef ANDROID
thiz->mSizeConsumed = 0;
#endif
BufferHeader *bufferHeader = thiz->mTypical;
unsigned i;
for (i = 0; i < BUFFER_HEADER_TYPICAL+1; ++i, ++bufferHeader) {
bufferHeader->mBuffer = NULL;
bufferHeader->mSize = 0;
}
}
/** \brief Interface deinitialization hook called by IObject::Destroy.
* Free the buffer queue, if it was larger than typical.
*/
void IBufferQueue_deinit(void *self)
{
IBufferQueue *thiz = (IBufferQueue *) self;
if ((NULL != thiz->mArray) && (thiz->mArray != thiz->mTypical)) {
free(thiz->mArray);
thiz->mArray = NULL;
}
}