/*
**
** Copyright (C) 2008, 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.
*/
#define LOG_TAG "CameraService"
#include <stdio.h>
#include <sys/types.h>
#include <pthread.h>
#include <binder/IPCThreadState.h>
#include <binder/IServiceManager.h>
#include <binder/MemoryBase.h>
#include <binder/MemoryHeapBase.h>
#include <cutils/atomic.h>
#include <hardware/hardware.h>
#include <media/AudioSystem.h>
#include <media/mediaplayer.h>
#include <surfaceflinger/ISurface.h>
#include <ui/Overlay.h>
#include <utils/Errors.h>
#include <utils/Log.h>
#include <utils/String16.h>
#include "CameraService.h"
namespace android {
// ----------------------------------------------------------------------------
// Logging support -- this is for debugging only
// Use "adb shell dumpsys media.camera -v 1" to change it.
static volatile int32_t gLogLevel = 0;
#define LOG1(...) LOGD_IF(gLogLevel >= 1, __VA_ARGS__);
#define LOG2(...) LOGD_IF(gLogLevel >= 2, __VA_ARGS__);
static void setLogLevel(int level) {
android_atomic_write(level, &gLogLevel);
}
// ----------------------------------------------------------------------------
static int getCallingPid() {
return IPCThreadState::self()->getCallingPid();
}
static int getCallingUid() {
return IPCThreadState::self()->getCallingUid();
}
// ----------------------------------------------------------------------------
// This is ugly and only safe if we never re-create the CameraService, but
// should be ok for now.
static CameraService *gCameraService;
CameraService::CameraService()
:mSoundRef(0)
{
LOGI("CameraService started (pid=%d)", getpid());
mNumberOfCameras = HAL_getNumberOfCameras();
if (mNumberOfCameras > MAX_CAMERAS) {
LOGE("Number of cameras(%d) > MAX_CAMERAS(%d).",
mNumberOfCameras, MAX_CAMERAS);
mNumberOfCameras = MAX_CAMERAS;
}
for (int i = 0; i < mNumberOfCameras; i++) {
setCameraFree(i);
}
gCameraService = this;
}
CameraService::~CameraService() {
for (int i = 0; i < mNumberOfCameras; i++) {
if (mBusy[i]) {
LOGE("camera %d is still in use in destructor!", i);
}
}
gCameraService = NULL;
}
int32_t CameraService::getNumberOfCameras() {
return mNumberOfCameras;
}
status_t CameraService::getCameraInfo(int cameraId,
struct CameraInfo* cameraInfo) {
if (cameraId < 0 || cameraId >= mNumberOfCameras) {
return BAD_VALUE;
}
HAL_getCameraInfo(cameraId, cameraInfo);
return OK;
}
sp<ICamera> CameraService::connect(
const sp<ICameraClient>& cameraClient, int cameraId) {
int callingPid = getCallingPid();
LOG1("CameraService::connect E (pid %d, id %d)", callingPid, cameraId);
sp<Client> client;
if (cameraId < 0 || cameraId >= mNumberOfCameras) {
LOGE("CameraService::connect X (pid %d) rejected (invalid cameraId %d).",
callingPid, cameraId);
return NULL;
}
Mutex::Autolock lock(mServiceLock);
if (mClient[cameraId] != 0) {
client = mClient[cameraId].promote();
if (client != 0) {
if (cameraClient->asBinder() == client->getCameraClient()->asBinder()) {
LOG1("CameraService::connect X (pid %d) (the same client)",
callingPid);
return client;
} else {
LOGW("CameraService::connect X (pid %d) rejected (existing client).",
callingPid);
return NULL;
}
}
mClient[cameraId].clear();
}
if (mBusy[cameraId]) {
LOGW("CameraService::connect X (pid %d) rejected"
" (camera %d is still busy).", callingPid, cameraId);
return NULL;
}
sp<CameraHardwareInterface> hardware = HAL_openCameraHardware(cameraId);
if (hardware == NULL) {
LOGE("Fail to open camera hardware (id=%d)", cameraId);
return NULL;
}
CameraInfo info;
HAL_getCameraInfo(cameraId, &info);
client = new Client(this, cameraClient, hardware, cameraId, info.facing,
callingPid);
mClient[cameraId] = client;
LOG1("CameraService::connect X");
return client;
}
void CameraService::removeClient(const sp<ICameraClient>& cameraClient) {
int callingPid = getCallingPid();
LOG1("CameraService::removeClient E (pid %d)", callingPid);
for (int i = 0; i < mNumberOfCameras; i++) {
// Declare this before the lock to make absolutely sure the
// destructor won't be called with the lock held.
sp<Client> client;
Mutex::Autolock lock(mServiceLock);
// This happens when we have already disconnected (or this is
// just another unused camera).
if (mClient[i] == 0) continue;
// Promote mClient. It can fail if we are called from this path:
// Client::~Client() -> disconnect() -> removeClient().
client = mClient[i].promote();
if (client == 0) {
mClient[i].clear();
continue;
}
if (cameraClient->asBinder() == client->getCameraClient()->asBinder()) {
// Found our camera, clear and leave.
LOG1("removeClient: clear camera %d", i);
mClient[i].clear();
break;
}
}
LOG1("CameraService::removeClient X (pid %d)", callingPid);
}
sp<CameraService::Client> CameraService::getClientById(int cameraId) {
if (cameraId < 0 || cameraId >= mNumberOfCameras) return NULL;
return mClient[cameraId].promote();
}
status_t CameraService::onTransact(
uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags) {
// Permission checks
switch (code) {
case BnCameraService::CONNECT:
const int pid = getCallingPid();
const int self_pid = getpid();
if (pid != self_pid) {
// we're called from a different process, do the real check
if (!checkCallingPermission(
String16("android.permission.CAMERA"))) {
const int uid = getCallingUid();
LOGE("Permission Denial: "
"can't use the camera pid=%d, uid=%d", pid, uid);
return PERMISSION_DENIED;
}
}
break;
}
return BnCameraService::onTransact(code, data, reply, flags);
}
// The reason we need this busy bit is a new CameraService::connect() request
// may come in while the previous Client's destructor has not been run or is
// still running. If the last strong reference of the previous Client is gone
// but the destructor has not been finished, we should not allow the new Client
// to be created because we need to wait for the previous Client to tear down
// the hardware first.
void CameraService::setCameraBusy(int cameraId) {
android_atomic_write(1, &mBusy[cameraId]);
}
void CameraService::setCameraFree(int cameraId) {
android_atomic_write(0, &mBusy[cameraId]);
}
// We share the media players for shutter and recording sound for all clients.
// A reference count is kept to determine when we will actually release the
// media players.
static MediaPlayer* newMediaPlayer(const char *file) {
MediaPlayer* mp = new MediaPlayer();
if (mp->setDataSource(file, NULL) == NO_ERROR) {
mp->setAudioStreamType(AudioSystem::ENFORCED_AUDIBLE);
mp->prepare();
} else {
LOGE("Failed to load CameraService sounds: %s", file);
return NULL;
}
return mp;
}
void CameraService::loadSound() {
Mutex::Autolock lock(mSoundLock);
LOG1("CameraService::loadSound ref=%d", mSoundRef);
if (mSoundRef++) return;
mSoundPlayer[SOUND_SHUTTER] = newMediaPlayer("/system/media/audio/ui/camera_click.ogg");
mSoundPlayer[SOUND_RECORDING] = newMediaPlayer("/system/media/audio/ui/VideoRecord.ogg");
}
void CameraService::releaseSound() {
Mutex::Autolock lock(mSoundLock);
LOG1("CameraService::releaseSound ref=%d", mSoundRef);
if (--mSoundRef) return;
for (int i = 0; i < NUM_SOUNDS; i++) {
if (mSoundPlayer[i] != 0) {
mSoundPlayer[i]->disconnect();
mSoundPlayer[i].clear();
}
}
}
void CameraService::playSound(sound_kind kind) {
LOG1("playSound(%d)", kind);
Mutex::Autolock lock(mSoundLock);
sp<MediaPlayer> player = mSoundPlayer[kind];
if (player != 0) {
// do not play the sound if stream volume is 0
// (typically because ringer mode is silent).
int index;
AudioSystem::getStreamVolumeIndex(AudioSystem::ENFORCED_AUDIBLE, &index);
if (index != 0) {
player->seekTo(0);
player->start();
}
}
}
// ----------------------------------------------------------------------------
CameraService::Client::Client(const sp<CameraService>& cameraService,
const sp<ICameraClient>& cameraClient,
const sp<CameraHardwareInterface>& hardware,
int cameraId, int cameraFacing, int clientPid) {
int callingPid = getCallingPid();
LOG1("Client::Client E (pid %d)", callingPid);
mCameraService = cameraService;
mCameraClient = cameraClient;
mHardware = hardware;
mCameraId = cameraId;
mCameraFacing = cameraFacing;
mClientPid = clientPid;
mUseOverlay = mHardware->useOverlay();
mMsgEnabled = 0;
mHardware->setCallbacks(notifyCallback,
dataCallback,
dataCallbackTimestamp,
(void *)cameraId);
// Enable zoom, error, and focus messages by default
enableMsgType(CAMERA_MSG_ERROR |
CAMERA_MSG_ZOOM |
CAMERA_MSG_FOCUS);
mOverlayW = 0;
mOverlayH = 0;
// Callback is disabled by default
mPreviewCallbackFlag = FRAME_CALLBACK_FLAG_NOOP;
mOrientation = getOrientation(0, mCameraFacing == CAMERA_FACING_FRONT);
mOrientationChanged = false;
cameraService->setCameraBusy(cameraId);
cameraService->loadSound();
LOG1("Client::Client X (pid %d)", callingPid);
}
static void *unregister_surface(void *arg) {
ISurface *surface = (ISurface *)arg;
surface->unregisterBuffers();
IPCThreadState::self()->flushCommands();
return NULL;
}
// tear down the client
CameraService::Client::~Client() {
int callingPid = getCallingPid();
LOG1("Client::~Client E (pid %d, this %p)", callingPid, this);
if (mSurface != 0 && !mUseOverlay) {
pthread_t thr;
// We unregister the buffers in a different thread because binder does
// not let us make sychronous transactions in a binder destructor (that
// is, upon our reaching a refcount of zero.)
pthread_create(&thr,
NULL, // attr
unregister_surface,
mSurface.get());
pthread_join(thr, NULL);
}
// set mClientPid to let disconnet() tear down the hardware
mClientPid = callingPid;
disconnect();
mCameraService->releaseSound();
LOG1("Client::~Client X (pid %d, this %p)", callingPid, this);
}
// ----------------------------------------------------------------------------
status_t CameraService::Client::checkPid() const {
int callingPid = getCallingPid();
if (callingPid == mClientPid) return NO_ERROR;
LOGW("attempt to use a locked camera from a different process"
" (old pid %d, new pid %d)", mClientPid, callingPid);
return EBUSY;
}
status_t CameraService::Client::checkPidAndHardware() const {
status_t result = checkPid();
if (result != NO_ERROR) return result;
if (mHardware == 0) {
LOGE("attempt to use a camera after disconnect() (pid %d)", getCallingPid());
return INVALID_OPERATION;
}
return NO_ERROR;
}
status_t CameraService::Client::lock() {
int callingPid = getCallingPid();
LOG1("lock (pid %d)", callingPid);
Mutex::Autolock lock(mLock);
// lock camera to this client if the the camera is unlocked
if (mClientPid == 0) {
mClientPid = callingPid;
return NO_ERROR;
}
// returns NO_ERROR if the client already owns the camera, EBUSY otherwise
return checkPid();
}
status_t CameraService::Client::unlock() {
int callingPid = getCallingPid();
LOG1("unlock (pid %d)", callingPid);
Mutex::Autolock lock(mLock);
// allow anyone to use camera (after they lock the camera)
status_t result = checkPid();
if (result == NO_ERROR) {
mClientPid = 0;
LOG1("clear mCameraClient (pid %d)", callingPid);
// we need to remove the reference to ICameraClient so that when the app
// goes away, the reference count goes to 0.
mCameraClient.clear();
}
return result;
}
// connect a new client to the camera
status_t CameraService::Client::connect(const sp<ICameraClient>& client) {
int callingPid = getCallingPid();
LOG1("connect E (pid %d)", callingPid);
Mutex::Autolock lock(mLock);
if (mClientPid != 0 && checkPid() != NO_ERROR) {
LOGW("Tried to connect to a locked camera (old pid %d, new pid %d)",
mClientPid, callingPid);
return EBUSY;
}
if (mCameraClient != 0 && (client->asBinder() == mCameraClient->asBinder())) {
LOG1("Connect to the same client");
return NO_ERROR;
}
mPreviewCallbackFlag = FRAME_CALLBACK_FLAG_NOOP;
mClientPid = callingPid;
mCameraClient = client;
LOG1("connect X (pid %d)", callingPid);
return NO_ERROR;
}
void CameraService::Client::disconnect() {
int callingPid = getCallingPid();
LOG1("disconnect E (pid %d)", callingPid);
Mutex::Autolock lock(mLock);
if (checkPid() != NO_ERROR) {
LOGW("different client - don't disconnect");
return;
}
if (mClientPid <= 0) {
LOG1("camera is unlocked (mClientPid = %d), don't tear down hardware", mClientPid);
return;
}
// Make sure disconnect() is done once and once only, whether it is called
// from the user directly, or called by the destructor.
if (mHardware == 0) return;
LOG1("hardware teardown");
// Before destroying mHardware, we must make sure it's in the
// idle state.
// Turn off all messages.
disableMsgType(CAMERA_MSG_ALL_MSGS);
mHardware->stopPreview();
mHardware->cancelPicture();
// Release the hardware resources.
mHardware->release();
// Release the held overlay resources.
if (mUseOverlay) {
mOverlayRef = 0;
}
mHardware.clear();
mCameraService->removeClient(mCameraClient);
mCameraService->setCameraFree(mCameraId);
LOG1("disconnect X (pid %d)", callingPid);
}
// ----------------------------------------------------------------------------
// set the ISurface that the preview will use
status_t CameraService::Client::setPreviewDisplay(const sp<ISurface>& surface) {
LOG1("setPreviewDisplay(%p) (pid %d)", surface.get(), getCallingPid());
Mutex::Autolock lock(mLock);
status_t result = checkPidAndHardware();
if (result != NO_ERROR) return result;
result = NO_ERROR;
// return if no change in surface.
// asBinder() is safe on NULL (returns NULL)
if (surface->asBinder() == mSurface->asBinder()) {
return result;
}
if (mSurface != 0) {
LOG1("clearing old preview surface %p", mSurface.get());
if (mUseOverlay) {
// Force the destruction of any previous overlay
sp<Overlay> dummy;
mHardware->setOverlay(dummy);
mOverlayRef = 0;
} else {
mSurface->unregisterBuffers();
}
}
mSurface = surface;
mOverlayRef = 0;
// If preview has been already started, set overlay or register preview
// buffers now.
if (mHardware->previewEnabled()) {
if (mUseOverlay) {
result = setOverlay();
} else if (mSurface != 0) {
result = registerPreviewBuffers();
}
}
return result;
}
status_t CameraService::Client::registerPreviewBuffers() {
int w, h;
CameraParameters params(mHardware->getParameters());
params.getPreviewSize(&w, &h);
// FIXME: don't use a hardcoded format here.
ISurface::BufferHeap buffers(w, h, w, h,
HAL_PIXEL_FORMAT_YCrCb_420_SP,
mOrientation,
0,
mHardware->getPreviewHeap());
status_t result = mSurface->registerBuffers(buffers);
if (result != NO_ERROR) {
LOGE("registerBuffers failed with status %d", result);
}
return result;
}
status_t CameraService::Client::setOverlay() {
int w, h;
CameraParameters params(mHardware->getParameters());
params.getPreviewSize(&w, &h);
if (w != mOverlayW || h != mOverlayH || mOrientationChanged) {
// Force the destruction of any previous overlay
sp<Overlay> dummy;
mHardware->setOverlay(dummy);
mOverlayRef = 0;
mOrientationChanged = false;
}
status_t result = NO_ERROR;
if (mSurface == 0) {
result = mHardware->setOverlay(NULL);
} else {
if (mOverlayRef == 0) {
// FIXME:
// Surfaceflinger may hold onto the previous overlay reference for some
// time after we try to destroy it. retry a few times. In the future, we
// should make the destroy call block, or possibly specify that we can
// wait in the createOverlay call if the previous overlay is in the
// process of being destroyed.
for (int retry = 0; retry < 50; ++retry) {
mOverlayRef = mSurface->createOverlay(w, h, OVERLAY_FORMAT_DEFAULT,
mOrientation);
if (mOverlayRef != 0) break;
LOGW("Overlay create failed - retrying");
usleep(20000);
}
if (mOverlayRef == 0) {
LOGE("Overlay Creation Failed!");
return -EINVAL;
}
result = mHardware->setOverlay(new Overlay(mOverlayRef));
}
}
if (result != NO_ERROR) {
LOGE("mHardware->setOverlay() failed with status %d\n", result);
return result;
}
mOverlayW = w;
mOverlayH = h;
return result;
}
// set the preview callback flag to affect how the received frames from
// preview are handled.
void CameraService::Client::setPreviewCallbackFlag(int callback_flag) {
LOG1("setPreviewCallbackFlag(%d) (pid %d)", callback_flag, getCallingPid());
Mutex::Autolock lock(mLock);
if (checkPidAndHardware() != NO_ERROR) return;
mPreviewCallbackFlag = callback_flag;
// If we don't use overlay, we always need the preview frame for display.
// If we do use overlay, we only need the preview frame if the user
// wants the data.
if (mUseOverlay) {
if(mPreviewCallbackFlag & FRAME_CALLBACK_FLAG_ENABLE_MASK) {
enableMsgType(CAMERA_MSG_PREVIEW_FRAME);
} else {
disableMsgType(CAMERA_MSG_PREVIEW_FRAME);
}
}
}
// start preview mode
status_t CameraService::Client::startPreview() {
LOG1("startPreview (pid %d)", getCallingPid());
return startCameraMode(CAMERA_PREVIEW_MODE);
}
// start recording mode
status_t CameraService::Client::startRecording() {
LOG1("startRecording (pid %d)", getCallingPid());
return startCameraMode(CAMERA_RECORDING_MODE);
}
// start preview or recording
status_t CameraService::Client::startCameraMode(camera_mode mode) {
LOG1("startCameraMode(%d)", mode);
Mutex::Autolock lock(mLock);
status_t result = checkPidAndHardware();
if (result != NO_ERROR) return result;
switch(mode) {
case CAMERA_PREVIEW_MODE:
if (mSurface == 0) {
LOG1("mSurface is not set yet.");
// still able to start preview in this case.
}
return startPreviewMode();
case CAMERA_RECORDING_MODE:
if (mSurface == 0) {
LOGE("mSurface must be set before startRecordingMode.");
return INVALID_OPERATION;
}
return startRecordingMode();
default:
return UNKNOWN_ERROR;
}
}
status_t CameraService::Client::startPreviewMode() {
LOG1("startPreviewMode");
status_t result = NO_ERROR;
// if preview has been enabled, nothing needs to be done
if (mHardware->previewEnabled()) {
return NO_ERROR;
}
if (mUseOverlay) {
// If preview display has been set, set overlay now.
if (mSurface != 0) {
result = setOverlay();
}
if (result != NO_ERROR) return result;
result = mHardware->startPreview();
} else {
enableMsgType(CAMERA_MSG_PREVIEW_FRAME);
result = mHardware->startPreview();
if (result != NO_ERROR) return result;
// If preview display has been set, register preview buffers now.
if (mSurface != 0) {
// Unregister here because the surface may be previously registered
// with the raw (snapshot) heap.
mSurface->unregisterBuffers();
result = registerPreviewBuffers();
}
}
return result;
}
status_t CameraService::Client::startRecordingMode() {
LOG1("startRecordingMode");
status_t result = NO_ERROR;
// if recording has been enabled, nothing needs to be done
if (mHardware->recordingEnabled()) {
return NO_ERROR;
}
// if preview has not been started, start preview first
if (!mHardware->previewEnabled()) {
result = startPreviewMode();
if (result != NO_ERROR) {
return result;
}
}
// start recording mode
enableMsgType(CAMERA_MSG_VIDEO_FRAME);
mCameraService->playSound(SOUND_RECORDING);
result = mHardware->startRecording();
if (result != NO_ERROR) {
LOGE("mHardware->startRecording() failed with status %d", result);
}
return result;
}
// stop preview mode
void CameraService::Client::stopPreview() {
LOG1("stopPreview (pid %d)", getCallingPid());
Mutex::Autolock lock(mLock);
if (checkPidAndHardware() != NO_ERROR) return;
disableMsgType(CAMERA_MSG_PREVIEW_FRAME);
mHardware->stopPreview();
if (mSurface != 0 && !mUseOverlay) {
mSurface->unregisterBuffers();
}
mPreviewBuffer.clear();
}
// stop recording mode
void CameraService::Client::stopRecording() {
LOG1("stopRecording (pid %d)", getCallingPid());
Mutex::Autolock lock(mLock);
if (checkPidAndHardware() != NO_ERROR) return;
mCameraService->playSound(SOUND_RECORDING);
disableMsgType(CAMERA_MSG_VIDEO_FRAME);
mHardware->stopRecording();
mPreviewBuffer.clear();
}
// release a recording frame
void CameraService::Client::releaseRecordingFrame(const sp<IMemory>& mem) {
Mutex::Autolock lock(mLock);
if (checkPidAndHardware() != NO_ERROR) return;
mHardware->releaseRecordingFrame(mem);
}
bool CameraService::Client::previewEnabled() {
LOG1("previewEnabled (pid %d)", getCallingPid());
Mutex::Autolock lock(mLock);
if (checkPidAndHardware() != NO_ERROR) return false;
return mHardware->previewEnabled();
}
bool CameraService::Client::recordingEnabled() {
LOG1("recordingEnabled (pid %d)", getCallingPid());
Mutex::Autolock lock(mLock);
if (checkPidAndHardware() != NO_ERROR) return false;
return mHardware->recordingEnabled();
}
status_t CameraService::Client::autoFocus() {
LOG1("autoFocus (pid %d)", getCallingPid());
Mutex::Autolock lock(mLock);
status_t result = checkPidAndHardware();
if (result != NO_ERROR) return result;
return mHardware->autoFocus();
}
status_t CameraService::Client::cancelAutoFocus() {
LOG1("cancelAutoFocus (pid %d)", getCallingPid());
Mutex::Autolock lock(mLock);
status_t result = checkPidAndHardware();
if (result != NO_ERROR) return result;
return mHardware->cancelAutoFocus();
}
// take a picture - image is returned in callback
status_t CameraService::Client::takePicture() {
LOG1("takePicture (pid %d)", getCallingPid());
Mutex::Autolock lock(mLock);
status_t result = checkPidAndHardware();
if (result != NO_ERROR) return result;
enableMsgType(CAMERA_MSG_SHUTTER |
CAMERA_MSG_POSTVIEW_FRAME |
CAMERA_MSG_RAW_IMAGE |
CAMERA_MSG_COMPRESSED_IMAGE);
return mHardware->takePicture();
}
// set preview/capture parameters - key/value pairs
status_t CameraService::Client::setParameters(const String8& params) {
LOG1("setParameters (pid %d) (%s)", getCallingPid(), params.string());
Mutex::Autolock lock(mLock);
status_t result = checkPidAndHardware();
if (result != NO_ERROR) return result;
CameraParameters p(params);
return mHardware->setParameters(p);
}
// get preview/capture parameters - key/value pairs
String8 CameraService::Client::getParameters() const {
Mutex::Autolock lock(mLock);
if (checkPidAndHardware() != NO_ERROR) return String8();
String8 params(mHardware->getParameters().flatten());
LOG1("getParameters (pid %d) (%s)", getCallingPid(), params.string());
return params;
}
status_t CameraService::Client::sendCommand(int32_t cmd, int32_t arg1, int32_t arg2) {
LOG1("sendCommand (pid %d)", getCallingPid());
int orientation;
Mutex::Autolock lock(mLock);
status_t result = checkPidAndHardware();
if (result != NO_ERROR) return result;
if (cmd == CAMERA_CMD_SET_DISPLAY_ORIENTATION) {
// The orientation cannot be set during preview.
if (mHardware->previewEnabled()) {
return INVALID_OPERATION;
}
// Mirror the preview if the camera is front-facing.
orientation = getOrientation(arg1, mCameraFacing == CAMERA_FACING_FRONT);
if (orientation == -1) return BAD_VALUE;
if (mOrientation != orientation) {
mOrientation = orientation;
if (mOverlayRef != 0) mOrientationChanged = true;
}
return OK;
}
return mHardware->sendCommand(cmd, arg1, arg2);
}
// ----------------------------------------------------------------------------
void CameraService::Client::enableMsgType(int32_t msgType) {
android_atomic_or(msgType, &mMsgEnabled);
mHardware->enableMsgType(msgType);
}
void CameraService::Client::disableMsgType(int32_t msgType) {
android_atomic_and(~msgType, &mMsgEnabled);
mHardware->disableMsgType(msgType);
}
#define CHECK_MESSAGE_INTERVAL 10 // 10ms
bool CameraService::Client::lockIfMessageWanted(int32_t msgType) {
int sleepCount = 0;
while (mMsgEnabled & msgType) {
if (mLock.tryLock() == NO_ERROR) {
if (sleepCount > 0) {
LOG1("lockIfMessageWanted(%d): waited for %d ms",
msgType, sleepCount * CHECK_MESSAGE_INTERVAL);
}
return true;
}
if (sleepCount++ == 0) {
LOG1("lockIfMessageWanted(%d): enter sleep", msgType);
}
usleep(CHECK_MESSAGE_INTERVAL * 1000);
}
LOGW("lockIfMessageWanted(%d): dropped unwanted message", msgType);
return false;
}
// ----------------------------------------------------------------------------
// Converts from a raw pointer to the client to a strong pointer during a
// hardware callback. This requires the callbacks only happen when the client
// is still alive.
sp<CameraService::Client> CameraService::Client::getClientFromCookie(void* user) {
sp<Client> client = gCameraService->getClientById((int) user);
// This could happen if the Client is in the process of shutting down (the
// last strong reference is gone, but the destructor hasn't finished
// stopping the hardware).
if (client == 0) return NULL;
// The checks below are not necessary and are for debugging only.
if (client->mCameraService.get() != gCameraService) {
LOGE("mismatch service!");
return NULL;
}
if (client->mHardware == 0) {
LOGE("mHardware == 0: callback after disconnect()?");
return NULL;
}
return client;
}
// Callback messages can be dispatched to internal handlers or pass to our
// client's callback functions, depending on the message type.
//
// notifyCallback:
// CAMERA_MSG_SHUTTER handleShutter
// (others) c->notifyCallback
// dataCallback:
// CAMERA_MSG_PREVIEW_FRAME handlePreviewData
// CAMERA_MSG_POSTVIEW_FRAME handlePostview
// CAMERA_MSG_RAW_IMAGE handleRawPicture
// CAMERA_MSG_COMPRESSED_IMAGE handleCompressedPicture
// (others) c->dataCallback
// dataCallbackTimestamp
// (others) c->dataCallbackTimestamp
//
// NOTE: the *Callback functions grab mLock of the client before passing
// control to handle* functions. So the handle* functions must release the
// lock before calling the ICameraClient's callbacks, so those callbacks can
// invoke methods in the Client class again (For example, the preview frame
// callback may want to releaseRecordingFrame). The handle* functions must
// release the lock after all accesses to member variables, so it must be
// handled very carefully.
void CameraService::Client::notifyCallback(int32_t msgType, int32_t ext1,
int32_t ext2, void* user) {
LOG2("notifyCallback(%d)", msgType);
sp<Client> client = getClientFromCookie(user);
if (client == 0) return;
if (!client->lockIfMessageWanted(msgType)) return;
switch (msgType) {
case CAMERA_MSG_SHUTTER:
// ext1 is the dimension of the yuv picture.
client->handleShutter((image_rect_type *)ext1);
break;
default:
client->handleGenericNotify(msgType, ext1, ext2);
break;
}
}
void CameraService::Client::dataCallback(int32_t msgType,
const sp<IMemory>& dataPtr, void* user) {
LOG2("dataCallback(%d)", msgType);
sp<Client> client = getClientFromCookie(user);
if (client == 0) return;
if (!client->lockIfMessageWanted(msgType)) return;
if (dataPtr == 0) {
LOGE("Null data returned in data callback");
client->handleGenericNotify(CAMERA_MSG_ERROR, UNKNOWN_ERROR, 0);
return;
}
switch (msgType) {
case CAMERA_MSG_PREVIEW_FRAME:
client->handlePreviewData(dataPtr);
break;
case CAMERA_MSG_POSTVIEW_FRAME:
client->handlePostview(dataPtr);
break;
case CAMERA_MSG_RAW_IMAGE:
client->handleRawPicture(dataPtr);
break;
case CAMERA_MSG_COMPRESSED_IMAGE:
client->handleCompressedPicture(dataPtr);
break;
default:
client->handleGenericData(msgType, dataPtr);
break;
}
}
void CameraService::Client::dataCallbackTimestamp(nsecs_t timestamp,
int32_t msgType, const sp<IMemory>& dataPtr, void* user) {
LOG2("dataCallbackTimestamp(%d)", msgType);
sp<Client> client = getClientFromCookie(user);
if (client == 0) return;
if (!client->lockIfMessageWanted(msgType)) return;
if (dataPtr == 0) {
LOGE("Null data returned in data with timestamp callback");
client->handleGenericNotify(CAMERA_MSG_ERROR, UNKNOWN_ERROR, 0);
return;
}
client->handleGenericDataTimestamp(timestamp, msgType, dataPtr);
}
// snapshot taken callback
// "size" is the width and height of yuv picture for registerBuffer.
// If it is NULL, use the picture size from parameters.
void CameraService::Client::handleShutter(image_rect_type *size) {
mCameraService->playSound(SOUND_SHUTTER);
// Screen goes black after the buffer is unregistered.
if (mSurface != 0 && !mUseOverlay) {
mSurface->unregisterBuffers();
}
sp<ICameraClient> c = mCameraClient;
if (c != 0) {
mLock.unlock();
c->notifyCallback(CAMERA_MSG_SHUTTER, 0, 0);
if (!lockIfMessageWanted(CAMERA_MSG_SHUTTER)) return;
}
disableMsgType(CAMERA_MSG_SHUTTER);
// It takes some time before yuvPicture callback to be called.
// Register the buffer for raw image here to reduce latency.
if (mSurface != 0 && !mUseOverlay) {
int w, h;
CameraParameters params(mHardware->getParameters());
if (size == NULL) {
params.getPictureSize(&w, &h);
} else {
w = size->width;
h = size->height;
w &= ~1;
h &= ~1;
LOG1("Snapshot image width=%d, height=%d", w, h);
}
// FIXME: don't use hardcoded format constants here
ISurface::BufferHeap buffers(w, h, w, h,
HAL_PIXEL_FORMAT_YCrCb_420_SP, mOrientation, 0,
mHardware->getRawHeap());
mSurface->registerBuffers(buffers);
IPCThreadState::self()->flushCommands();
}
mLock.unlock();
}
// preview callback - frame buffer update
void CameraService::Client::handlePreviewData(const sp<IMemory>& mem) {
ssize_t offset;
size_t size;
sp<IMemoryHeap> heap = mem->getMemory(&offset, &size);
if (!mUseOverlay) {
if (mSurface != 0) {
mSurface->postBuffer(offset);
}
}
// local copy of the callback flags
int flags = mPreviewCallbackFlag;
// is callback enabled?
if (!(flags & FRAME_CALLBACK_FLAG_ENABLE_MASK)) {
// If the enable bit is off, the copy-out and one-shot bits are ignored
LOG2("frame callback is disabled");
mLock.unlock();
return;
}
// hold a strong pointer to the client
sp<ICameraClient> c = mCameraClient;
// clear callback flags if no client or one-shot mode
if (c == 0 || (mPreviewCallbackFlag & FRAME_CALLBACK_FLAG_ONE_SHOT_MASK)) {
LOG2("Disable preview callback");
mPreviewCallbackFlag &= ~(FRAME_CALLBACK_FLAG_ONE_SHOT_MASK |
FRAME_CALLBACK_FLAG_COPY_OUT_MASK |
FRAME_CALLBACK_FLAG_ENABLE_MASK);
if (mUseOverlay) {
disableMsgType(CAMERA_MSG_PREVIEW_FRAME);
}
}
if (c != 0) {
// Is the received frame copied out or not?
if (flags & FRAME_CALLBACK_FLAG_COPY_OUT_MASK) {
LOG2("frame is copied");
copyFrameAndPostCopiedFrame(c, heap, offset, size);
} else {
LOG2("frame is forwarded");
mLock.unlock();
c->dataCallback(CAMERA_MSG_PREVIEW_FRAME, mem);
}
} else {
mLock.unlock();
}
}
// picture callback - postview image ready
void CameraService::Client::handlePostview(const sp<IMemory>& mem) {
disableMsgType(CAMERA_MSG_POSTVIEW_FRAME);
sp<ICameraClient> c = mCameraClient;
mLock.unlock();
if (c != 0) {
c->dataCallback(CAMERA_MSG_POSTVIEW_FRAME, mem);
}
}
// picture callback - raw image ready
void CameraService::Client::handleRawPicture(const sp<IMemory>& mem) {
disableMsgType(CAMERA_MSG_RAW_IMAGE);
ssize_t offset;
size_t size;
sp<IMemoryHeap> heap = mem->getMemory(&offset, &size);
// Put the YUV version of the snapshot in the preview display.
if (mSurface != 0 && !mUseOverlay) {
mSurface->postBuffer(offset);
}
sp<ICameraClient> c = mCameraClient;
mLock.unlock();
if (c != 0) {
c->dataCallback(CAMERA_MSG_RAW_IMAGE, mem);
}
}
// picture callback - compressed picture ready
void CameraService::Client::handleCompressedPicture(const sp<IMemory>& mem) {
disableMsgType(CAMERA_MSG_COMPRESSED_IMAGE);
sp<ICameraClient> c = mCameraClient;
mLock.unlock();
if (c != 0) {
c->dataCallback(CAMERA_MSG_COMPRESSED_IMAGE, mem);
}
}
void CameraService::Client::handleGenericNotify(int32_t msgType,
int32_t ext1, int32_t ext2) {
sp<ICameraClient> c = mCameraClient;
mLock.unlock();
if (c != 0) {
c->notifyCallback(msgType, ext1, ext2);
}
}
void CameraService::Client::handleGenericData(int32_t msgType,
const sp<IMemory>& dataPtr) {
sp<ICameraClient> c = mCameraClient;
mLock.unlock();
if (c != 0) {
c->dataCallback(msgType, dataPtr);
}
}
void CameraService::Client::handleGenericDataTimestamp(nsecs_t timestamp,
int32_t msgType, const sp<IMemory>& dataPtr) {
sp<ICameraClient> c = mCameraClient;
mLock.unlock();
if (c != 0) {
c->dataCallbackTimestamp(timestamp, msgType, dataPtr);
}
}
void CameraService::Client::copyFrameAndPostCopiedFrame(
const sp<ICameraClient>& client, const sp<IMemoryHeap>& heap,
size_t offset, size_t size) {
LOG2("copyFrameAndPostCopiedFrame");
// It is necessary to copy out of pmem before sending this to
// the callback. For efficiency, reuse the same MemoryHeapBase
// provided it's big enough. Don't allocate the memory or
// perform the copy if there's no callback.
// hold the preview lock while we grab a reference to the preview buffer
sp<MemoryHeapBase> previewBuffer;
if (mPreviewBuffer == 0) {
mPreviewBuffer = new MemoryHeapBase(size, 0, NULL);
} else if (size > mPreviewBuffer->virtualSize()) {
mPreviewBuffer.clear();
mPreviewBuffer = new MemoryHeapBase(size, 0, NULL);
}
if (mPreviewBuffer == 0) {
LOGE("failed to allocate space for preview buffer");
mLock.unlock();
return;
}
previewBuffer = mPreviewBuffer;
memcpy(previewBuffer->base(), (uint8_t *)heap->base() + offset, size);
sp<MemoryBase> frame = new MemoryBase(previewBuffer, 0, size);
if (frame == 0) {
LOGE("failed to allocate space for frame callback");
mLock.unlock();
return;
}
mLock.unlock();
client->dataCallback(CAMERA_MSG_PREVIEW_FRAME, frame);
}
int CameraService::Client::getOrientation(int degrees, bool mirror) {
if (!mirror) {
if (degrees == 0) return 0;
else if (degrees == 90) return HAL_TRANSFORM_ROT_90;
else if (degrees == 180) return HAL_TRANSFORM_ROT_180;
else if (degrees == 270) return HAL_TRANSFORM_ROT_270;
} else { // Do mirror (horizontal flip)
if (degrees == 0) { // FLIP_H and ROT_0
return HAL_TRANSFORM_FLIP_H;
} else if (degrees == 90) { // FLIP_H and ROT_90
return HAL_TRANSFORM_FLIP_H | HAL_TRANSFORM_ROT_90;
} else if (degrees == 180) { // FLIP_H and ROT_180
return HAL_TRANSFORM_FLIP_V;
} else if (degrees == 270) { // FLIP_H and ROT_270
return HAL_TRANSFORM_FLIP_V | HAL_TRANSFORM_ROT_90;
}
}
LOGE("Invalid setDisplayOrientation degrees=%d", degrees);
return -1;
}
// ----------------------------------------------------------------------------
static const int kDumpLockRetries = 50;
static const int kDumpLockSleep = 60000;
static bool tryLock(Mutex& mutex)
{
bool locked = false;
for (int i = 0; i < kDumpLockRetries; ++i) {
if (mutex.tryLock() == NO_ERROR) {
locked = true;
break;
}
usleep(kDumpLockSleep);
}
return locked;
}
status_t CameraService::dump(int fd, const Vector<String16>& args) {
static const char* kDeadlockedString = "CameraService may be deadlocked\n";
const size_t SIZE = 256;
char buffer[SIZE];
String8 result;
if (checkCallingPermission(String16("android.permission.DUMP")) == false) {
snprintf(buffer, SIZE, "Permission Denial: "
"can't dump CameraService from pid=%d, uid=%d\n",
getCallingPid(),
getCallingUid());
result.append(buffer);
write(fd, result.string(), result.size());
} else {
bool locked = tryLock(mServiceLock);
// failed to lock - CameraService is probably deadlocked
if (!locked) {
String8 result(kDeadlockedString);
write(fd, result.string(), result.size());
}
bool hasClient = false;
for (int i = 0; i < mNumberOfCameras; i++) {
sp<Client> client = mClient[i].promote();
if (client == 0) continue;
hasClient = true;
sprintf(buffer, "Client[%d] (%p) PID: %d\n",
i,
client->getCameraClient()->asBinder().get(),
client->mClientPid);
result.append(buffer);
write(fd, result.string(), result.size());
client->mHardware->dump(fd, args);
}
if (!hasClient) {
result.append("No camera client yet.\n");
write(fd, result.string(), result.size());
}
if (locked) mServiceLock.unlock();
// change logging level
int n = args.size();
for (int i = 0; i + 1 < n; i++) {
if (args[i] == String16("-v")) {
String8 levelStr(args[i+1]);
int level = atoi(levelStr.string());
sprintf(buffer, "Set Log Level to %d", level);
result.append(buffer);
setLogLevel(level);
}
}
}
return NO_ERROR;
}
}; // namespace android