Thank you Ole for your time. ChatGPT seems to be more descriptive to you 😊
I have been trying to recompile the libgphoto2 and its dependencies with clang and linking with iOS framework. Clang treats warning as errors and it needs source code changes. Also libgphoto2 loads dylb from system path which also needs to be taken into account. Over it's not straightforward. Thank you Anand On Mon, 16 Sept, 2024, 3:37 am Ole Aamot, <o...@gnu.org> wrote: > ChatGPT gave this answer: > > To implement a **libgphoto2** camera driver for an iPad over USB, you > would need to address several layers of challenges including hardware > support, communication protocols, and OS-level restrictions. Here's a > high-level approach to guide the development: > > ### Steps to Implement libgphoto2 Camera Driver for iPad USB > > #### 1. **Understand the iPad USB Accessory Framework** > - Apple provides the **External Accessory framework** to communicate > with external hardware. However, it's quite restrictive and typically meant > for licensed manufacturers. > - iOS and iPadOS don't natively support generic USB drivers like on > Linux or Windows, so the challenge is creating a bridge for libgphoto2 to > access the camera hardware over USB. > - Check if the camera can be accessed via a **Camera Connection Kit** > or Lightning-to-USB adapter and whether it's recognized as a USB accessory. > > #### 2. **Develop a Custom iOS App** > - You would likely need to create a custom iOS application using > **Swift** or **Objective-C** to interface with the camera. > - Investigate the **USBDevice** API (for iOS 16+) if available, which > offers more flexibility in accessing USB devices directly on iOS/iPadOS. > - Use the **USB Accessory Mode** for detecting connected devices. > > #### 3. **Compile libgphoto2 for iOS** > - Libgphoto2 is built for POSIX systems, so you’ll need to > cross-compile it for iOS using tools like **Xcode** or **CMake** with > specific target flags for ARM architecture. > - It may require modifications to libgphoto2 code to interact with > iOS's unique environment and APIs. > - Remove or adapt dependencies in libgphoto2 that might not be > supported by iOS (such as certain POSIX libraries). > > #### 4. **USB Communication Bridge** > - Libgphoto2 communicates with cameras using PTP (Picture Transfer > Protocol) or proprietary protocols over USB. > - Implement a communication bridge between libgphoto2 and iOS's USB > interface. This may involve writing code to mimic Linux's USB driver > behavior within the iOS app. > - The **libusb** library might also need to be ported or modified for > iOS to enable USB communication, since it is widely used by libgphoto2. > > #### 5. **Sandboxing and Permissions** > - iOS has strict sandboxing. Ensure that your app requests the > necessary permissions to communicate with USB devices and interact with > external hardware. > - Add necessary entitlements in the **Info.plist** file, like > `com.apple.external-accessory` or `com.apple.developer.usb`. > > #### 6. **Testing with Different Cameras** > - Libgphoto2 supports a wide range of cameras, so you'll need to test > with specific camera models. > - Ensure that the camera can be recognized by the app, and you can > trigger functions like capturing images, downloading files, or controlling > camera settings. > > #### 7. **Distributing the App** > - If the app is for personal use, you can sideload it to your iPad > using Xcode and a developer account. > - If the goal is broader distribution, you would need to ensure > compliance with Apple's guidelines, especially for apps interacting with > external hardware. > > ### Challenges > - **Apple's closed ecosystem**: iOS is not designed to be an open > system like Linux, so you will face challenges accessing hardware. > - **Licensing**: If this driver is to be distributed, you may need > Apple's MFi (Made for iPhone/iPad) certification for USB accessory > communication. > > ### Summary > This task involves cross-compiling libgphoto2 for iOS, interfacing with > iPad USB APIs, and overcoming OS-level restrictions. Starting with Apple’s > USBDevice APIs and building a custom iOS app to bridge libgphoto2’s > functionality is the best approach. You will likely need to experiment with > lower-level hardware protocols and iOS permissions to make it work > effectively. > > Sincerely, > > > Ole Aamot > > o...@aamot.org > > www.aamot.org > > +47-4173-2002 > > > > On Tue, Sep 10, 2024 at 9:11 AM Marcus Meissner <mar...@jet.franken.de> > wrote: > >> Hi, >> >> On Sun, Sep 08, 2024 at 07:21:03PM +0530, Anand Walvekar wrote: >> > Hi Team >> > Hope you are doing well. >> > >> > I need your help to integrate libgphoto2 in iPad application. Could you >> > please share me few links which I can try it out. >> > >> > Thank you >> > Anand >> >> This likely means the iPad as USB Host for cameras? >> >> I am not familar with either iPad or if iPad USB-Host is even possible, >> perhaps someone else knows it :/ >> >> Ciao, Marcus >> >> >> _______________________________________________ >> Gphoto-devel mailing list >> Gphoto-devel@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/gphoto-devel >> >
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