MTP host: Add support for reading files from an MTP device via ParcelFileDescriptor
Also added some support for sending files to the device that hasn't been debugged yet.
Add locking to MtpDevice to prevent it from attempting multiple transactions simultaneously.
Change-Id: I2b995ba0af086cc6920bd6b8c869f540ad78560a
Signed-off-by: Mike Lockwood <lockwood@android.com>
diff --git a/media/mtp/MtpDevice.h b/media/mtp/MtpDevice.h
index e41a872..57f492f 100644
--- a/media/mtp/MtpDevice.h
+++ b/media/mtp/MtpDevice.h
@@ -22,6 +22,8 @@
#include "MtpResponsePacket.h"
#include "MtpTypes.h"
+#include <utils/threads.h>
+
struct usb_device;
namespace android {
@@ -52,6 +54,9 @@
MtpDataPacket mData;
MtpResponsePacket mResponse;
+ // to ensure only one MTP transaction at a time
+ Mutex mMutex;
+
public:
MtpDevice(struct usb_device* device, int interface,
struct usb_endpoint *ep_in, struct usb_endpoint *ep_out,
@@ -73,16 +78,24 @@
MtpObjectHandleList* getObjectHandles(MtpStorageID storageID, MtpObjectFormat format, MtpObjectHandle parent);
MtpObjectInfo* getObjectInfo(MtpObjectHandle handle);
void* getThumbnail(MtpObjectHandle handle, int& outLength);
+ MtpObjectHandle sendObjectInfo(MtpObjectInfo* info);
+ bool sendObject(MtpObjectInfo* info, int srcFD);
bool deleteObject(MtpObjectHandle handle);
MtpObjectHandle getParent(MtpObjectHandle handle);
MtpObjectHandle getStorageID(MtpObjectHandle handle);
MtpProperty* getDevicePropDesc(MtpDeviceProperty code);
+ // returns the file descriptor for a pipe to read the object's data
+ int readObject(MtpObjectHandle handle, int objectSize);
+
private:
+ friend class ReadObjectThread;
+
bool sendRequest(MtpOperationCode operation);
- bool sendData(MtpOperationCode operation);
+ bool sendData();
bool readData();
+ bool writeDataHeader(MtpOperationCode operation, int dataLength);
MtpResponseCode readResponse();
};