drivers/media/platform/qcom/venus/venc.c

Source file repositories/reference/linux-study-clean/drivers/media/platform/qcom/venus/venc.c

File Facts

System
Linux kernel
Corpus path
drivers/media/platform/qcom/venus/venc.c
Extension
.c
Size
42332 bytes
Lines
1668
Domain
Driver Families
Bucket
drivers/media
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

switch (value) {
		case V4L2_MPEG_VIDEO_H264_ENTROPY_MODE_CAVLC:
		default:
			return HFI_H264_ENTROPY_CAVLC;
		case V4L2_MPEG_VIDEO_H264_ENTROPY_MODE_CABAC:
			return HFI_H264_ENTROPY_CABAC;
		}
	case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE:
		switch (value) {
		case V4L2_MPEG_VIDEO_H264_LOOP_FILTER_MODE_ENABLED:
		default:
			return HFI_H264_DB_MODE_ALL_BOUNDARY;
		case V4L2_MPEG_VIDEO_H264_LOOP_FILTER_MODE_DISABLED:
			return HFI_H264_DB_MODE_DISABLE;
		case V4L2_MPEG_VIDEO_H264_LOOP_FILTER_MODE_DISABLED_AT_SLICE_BOUNDARY:
			return HFI_H264_DB_MODE_SKIP_SLICE_BOUNDARY;
		}
	}

	return 0;
}

static int
venc_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
{
	struct venus_inst *inst = to_inst(file);
	struct venus_core *core = inst->core;

	strscpy(cap->driver, "qcom-venus", sizeof(cap->driver));
	strscpy(cap->card, "Qualcomm Venus video encoder", sizeof(cap->card));
	snprintf(cap->bus_info, sizeof(cap->bus_info),
		 "plat:%s:enc", dev_name(core->dev));

	return 0;
}

static int venc_enum_fmt(struct file *file, void *fh, struct v4l2_fmtdesc *f)
{
	struct venus_inst *inst = to_inst(file);
	const struct venus_format *fmt;

	fmt = find_format_by_index(inst, f->index, f->type);

	memset(f->reserved, 0, sizeof(f->reserved));

	if (!fmt)
		return -EINVAL;

	f->pixelformat = fmt->pixfmt;

	return 0;
}

static const struct venus_format *
venc_try_fmt_common(struct venus_inst *inst, struct v4l2_format *f)
{
	struct v4l2_pix_format_mplane *pixmp = &f->fmt.pix_mp;
	struct v4l2_plane_pix_format *pfmt = pixmp->plane_fmt;
	const struct venus_format *fmt;
	u32 sizeimage;

	memset(pfmt[0].reserved, 0, sizeof(pfmt[0].reserved));
	memset(pixmp->reserved, 0, sizeof(pixmp->reserved));

	fmt = find_format(inst, pixmp->pixelformat, f->type);
	if (!fmt) {
		if (f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
			pixmp->pixelformat = V4L2_PIX_FMT_H264;
		else if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE)
			pixmp->pixelformat = V4L2_PIX_FMT_NV12;
		else
			return NULL;
		fmt = find_format(inst, pixmp->pixelformat, f->type);
		if (!fmt)
			return NULL;
	}

	pixmp->width = clamp(pixmp->width, frame_width_min(inst),
			     frame_width_max(inst));
	pixmp->height = clamp(pixmp->height, frame_height_min(inst),
			      frame_height_max(inst));

	pixmp->width = ALIGN(pixmp->width, 128);
	pixmp->height = ALIGN(pixmp->height, 32);

	pixmp->width = ALIGN(pixmp->width, 2);
	pixmp->height = ALIGN(pixmp->height, 2);

	if (pixmp->field == V4L2_FIELD_ANY)
		pixmp->field = V4L2_FIELD_NONE;

Annotation

Implementation Notes