drivers/media/platform/verisilicon/hantro_vp8.c

Source file repositories/reference/linux-study-clean/drivers/media/platform/verisilicon/hantro_vp8.c

File Facts

System
Linux kernel
Corpus path
drivers/media/platform/verisilicon/hantro_vp8.c
Extension
.c
Size
5265 bytes
Lines
202
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

struct vp8_prob_tbl_packed {
	u8 prob_mb_skip_false;
	u8 prob_intra;
	u8 prob_ref_last;
	u8 prob_ref_golden;
	u8 prob_segment[3];
	u8 padding0;

	u8 prob_luma_16x16_pred_mode[4];
	u8 prob_chroma_pred_mode[3];
	u8 padding1;

	/* mv prob */
	u8 prob_mv_context[2][V4L2_VP8_MV_PROB_CNT];
	u8 padding2[2];

	/* coeff probs */
	u8 prob_coeffs[4][8][3][V4L2_VP8_COEFF_PROB_CNT];
	u8 padding3[96];
};

/*
 * filter taps taken to 7-bit precision,
 * reference RFC6386#Page-16, filters[8][6]
 */
const u32 hantro_vp8_dec_mc_filter[8][6] = {
	{ 0, 0, 128, 0, 0, 0 },
	{ 0, -6, 123, 12, -1, 0 },
	{ 2, -11, 108, 36, -8, 1 },
	{ 0, -9, 93, 50, -6, 0 },
	{ 3, -16, 77, 77, -16, 3 },
	{ 0, -6, 50, 93, -9, 0 },
	{ 1, -8, 36, 108, -11, 2 },
	{ 0, -1, 12, 123, -6, 0 }
};

void hantro_vp8_prob_update(struct hantro_ctx *ctx,
			    const struct v4l2_ctrl_vp8_frame *hdr)
{
	const struct v4l2_vp8_entropy *entropy = &hdr->entropy;
	u32 i, j, k;
	u8 *dst;

	/* first probs */
	dst = ctx->vp8_dec.prob_tbl.cpu;

	dst[0] = hdr->prob_skip_false;
	dst[1] = hdr->prob_intra;
	dst[2] = hdr->prob_last;
	dst[3] = hdr->prob_gf;
	dst[4] = hdr->segment.segment_probs[0];
	dst[5] = hdr->segment.segment_probs[1];
	dst[6] = hdr->segment.segment_probs[2];
	dst[7] = 0;

	dst += 8;
	dst[0] = entropy->y_mode_probs[0];
	dst[1] = entropy->y_mode_probs[1];
	dst[2] = entropy->y_mode_probs[2];
	dst[3] = entropy->y_mode_probs[3];
	dst[4] = entropy->uv_mode_probs[0];
	dst[5] = entropy->uv_mode_probs[1];
	dst[6] = entropy->uv_mode_probs[2];
	dst[7] = 0; /*unused */

	/* mv probs */
	dst += 8;
	dst[0] = entropy->mv_probs[0][0]; /* is short */
	dst[1] = entropy->mv_probs[1][0];
	dst[2] = entropy->mv_probs[0][1]; /* sign */
	dst[3] = entropy->mv_probs[1][1];
	dst[4] = entropy->mv_probs[0][8 + 9];
	dst[5] = entropy->mv_probs[0][9 + 9];
	dst[6] = entropy->mv_probs[1][8 + 9];
	dst[7] = entropy->mv_probs[1][9 + 9];
	dst += 8;
	for (i = 0; i < 2; ++i) {
		for (j = 0; j < 8; j += 4) {
			dst[0] = entropy->mv_probs[i][j + 9 + 0];
			dst[1] = entropy->mv_probs[i][j + 9 + 1];
			dst[2] = entropy->mv_probs[i][j + 9 + 2];
			dst[3] = entropy->mv_probs[i][j + 9 + 3];
			dst += 4;
		}
	}
	for (i = 0; i < 2; ++i) {
		dst[0] = entropy->mv_probs[i][0 + 2];
		dst[1] = entropy->mv_probs[i][1 + 2];
		dst[2] = entropy->mv_probs[i][2 + 2];
		dst[3] = entropy->mv_probs[i][3 + 2];

Annotation

Implementation Notes