fix(camera): flip sensor stream via v4l2

[baba-dev]

Summary

• enable the CSI sensor's horizontal flip control (and disable vertical flip) after the video device is initialized so the raw stream matches the UI without post-processing
• remove the SRM mirror setting so the PPA client just copies the frame while continuing to support future scaling/rotation
• add periodic logging of the PPA transfer duration to confirm the lower workload during profiling

Testing

• idf.py build (fails: command not found)

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https://chatgpt.com/codex/tasks/task_e_68cf1076e18083248a52d1993b5bd17b

[chatgpt-codex-connector]

Codex Review: Here are some suggestions.

M5Tab5-UserDemo/platforms/tab5/main/hal/components/hal_camera.cpp

Lines 93 to 102 in 2dc2154

	int app_video_open(char* dev, example_fmt_t init_fmt)
	{
	struct v4l2_format default_format;
	struct v4l2_capability capability;
	const int type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
	int fd = open(dev, O_RDONLY);
	if (fd < 0)
	{
	ESP_LOGE(TAG, "Open video failed");

[P1] Open video device read-only breaks new sensor flip controls

The change now relies on VIDIOC_S_CTRL to set V4L2_CID_HFLIP/VFLIP and disables the PPA mirror, but the device is still opened with open(dev, O_RDONLY). V4L2 control ioctls require write access; with a read-only descriptor these calls will fail with EPERM, so the sensor flip is never applied while software mirroring is removed and the preview remains mirrored. Open the device with O_RDWR or fall back to software mirroring when the control cannot be set.

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