Enable tracepoints:
echo 1 > /sys/kernel/debug/msm_camera/trace/enable
cat /sys/kernel/debug/tracing/trace_pipe | grep qcarcam
The QCARCAM API is a low-level, hardware-optimized interface designed by Qualcomm for controlling and streaming video from camera sensors connected to Qualcomm’s Image Signal Processor (ISP) and Video Processing Unit (VPU). It is widely deployed in automotive advanced driver-assistance systems (ADAS), surround-view systems, in-cabin monitoring, and industrial machine vision. The API provides fine-grained control over sensor configuration, frame synchronization, HDR stitching, and metadata extraction while minimizing CPU overhead. qcarcam api
Key findings:
The Qcarcam API is more than a simple camera control library—it is the strategic interface that unlocks Qualcomm’s automotive hardware muscle. From surround-view stitching to real-time driver monitoring, mastering this API allows engineers to build systems that are not just functional, but highly optimized for latency, bandwidth, and reliability. The QCARCAM API is a low-level, hardware-optimized interface
Whether you are working on an Android Automotive IVI system or a safety-critical ADAS controller on QNX, investing time in understanding the qcarcam.h header file and its asynchronous buffer model will pay dividends in performance and stability. .csi_lane_assign = 0x4321
QCARCAM is designed to work under:
Qualcomm also supplies reference implementations for:
qcarcam_hw_cfg_t hw_cfg =
.csi_lane_id = 0,
.csi_lane_assign = 0x4321,
.csi_data_type = QCARCAM_CSI_DT_RAW10,
.sensor_id = SONY_IMX390_ID
;
qcarcam_set_hw_config(session_id, &hw_cfg);