// 1. Open camera device qcarcam_open(0, &cam); // /dev/video0 or logical camera ID
| Feature | Standard V4L2 | qcarcam API | | :--- | :--- | :--- | | | Limited, requires custom ioctls | Native support ( QCARCAM_PIX_FMT_RAW10 ) | | Camera Sync | Master/slave via GPIO (high latency) | Hardware envelope tracking (µs accuracy) | | Memory Model | mmap or Userptr (high CPU copy cost) | Ion shared memory (Zero-copy via FD passing) | | Exposure/Gain Control | V4L2 controls (linear) | Dual ISP, HDR stitching, per-frame metadata | | AGL Integration | Requires custom GStreamer plugins | Direct libcamhal integration in AGL | qcarcam api
Supports complex multi-camera configurations, enabling features like 360-degree surround view and in-cabin monitoring. Typical Use Cases // 1. Open camera device qcarcam_open(0