status_t Camera3Stream::finishConfiguration(camera3_device *hal3Device) {
ATRACE_CALL();
Mutex::Autolock l(mLock);
switch (mState) {
case STATE_ERROR:
ALOGE("%s: In error state", __FUNCTION__);
return INVALID_OPERATION;
case STATE_IN_CONFIG:
case STATE_IN_RECONFIG:
// OK
break;
case STATE_CONSTRUCTED:
case STATE_CONFIGURED:
ALOGE("%s: Cannot finish configuration that hasn't been started",
__FUNCTION__);
return INVALID_OPERATION;
default:
ALOGE("%s: Unknown state", __FUNCTION__);
return INVALID_OPERATION;
}
// Register for idle tracking
sp<StatusTracker> statusTracker = mStatusTracker.promote();
if (statusTracker != 0) {
mStatusId = statusTracker->addComponent();
}
// Check if the stream configuration is unchanged, and skip reallocation if
// so. As documented in hardware/camera3.h:configure_streams().
if (mState == STATE_IN_RECONFIG &&
oldUsage == camera3_stream::usage &&
oldMaxBuffers == camera3_stream::max_buffers) {
mState = STATE_CONFIGURED;
return OK;
}
status_t res;
res = configureQueueLocked();
if (res != OK) {
ALOGE("%s: Unable to configure stream %d queue: %s (%d)",
__FUNCTION__, mId, strerror(-res), res);
mState = STATE_ERROR;
return res;
}
res = registerBuffersLocked(hal3Device);
if (res != OK) {
ALOGE("%s: Unable to register stream buffers with HAL: %s (%d)",
__FUNCTION__, strerror(-res), res);
mState = STATE_ERROR;
return res;
}
mState = STATE_CONFIGURED;
return res;
}
status_t Camera3Stream::tearDown() {
ATRACE_CALL();
Mutex::Autolock l(mLock);
status_t res = OK;
// This function should be only called when the stream is configured.
if (mState != STATE_CONFIGURED) {
ALOGE("%s: Stream %d: Can't tear down stream if stream is not in "
"CONFIGURED state %d", __FUNCTION__, mId, mState);
return INVALID_OPERATION;
}
// If any buffers have been handed to the HAL, the stream cannot be torn down.
if (getHandoutOutputBufferCountLocked() > 0) {
ALOGE("%s: Stream %d: Can't tear down a stream that has outstanding buffers",
__FUNCTION__, mId);
return INVALID_OPERATION;
}
// Free buffers by disconnecting and then reconnecting to the buffer queue
// Only unused buffers will be dropped immediately; buffers that have been filled
// and are waiting to be acquired by the consumer and buffers that are currently
// acquired will be freed once they are released by the consumer.
res = disconnectLocked();
if (res != OK) {
if (res == -ENOTCONN) {
// queue has been disconnected, nothing left to do, so exit with success
return OK;
}
ALOGE("%s: Stream %d: Unable to disconnect to tear down buffers: %s (%d)",
__FUNCTION__, mId, strerror(-res), res);
return res;
}
mState = STATE_IN_CONFIG;
res = configureQueueLocked();
if (res != OK) {
ALOGE("%s: Unable to configure stream %d queue: %s (%d)",
__FUNCTION__, mId, strerror(-res), res);
mState = STATE_ERROR;
return res;
}
// Reset prepared state, since we've reconnected to the queue and can prepare again.
mPrepared = false;
mStreamUnpreparable = false;
mState = STATE_CONFIGURED;
return OK;
}
