linux/drivers/media/platform/verisilicon/rockchip_vpu2_hw_jpeg_enc.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Hantro VPU codec driver
 *
 * Copyright (C) 2018 Rockchip Electronics Co., Ltd.
 *
 * JPEG encoder
 * ------------
 * The VPU JPEG encoder produces JPEG baseline sequential format.
 * The quantization coefficients are 8-bit values, complying with
 * the baseline specification. Therefore, it requires
 * luma and chroma quantization tables. The hardware does entropy
 * encoding using internal Huffman tables, as specified in the JPEG
 * specification.
 *
 * In other words, only the luma and chroma quantization tables are
 * required for the encoding operation.
 *
 * Quantization luma table values are written to registers
 * VEPU_swreg_0-VEPU_swreg_15, and chroma table values to
 * VEPU_swreg_16-VEPU_swreg_31. A special order is needed, neither
 * zigzag, nor linear.
 */

#include <asm/unaligned.h>
#include <media/v4l2-mem2mem.h>
#include "hantro_jpeg.h"
#include "hantro.h"
#include "hantro_v4l2.h"
#include "hantro_hw.h"
#include "rockchip_vpu2_regs.h"

#define VEPU_JPEG_QUANT_TABLE_COUNT …

static void rockchip_vpu2_set_src_img_ctrl(struct hantro_dev *vpu,
					   struct hantro_ctx *ctx)
{ … }

static void rockchip_vpu2_jpeg_enc_set_buffers(struct hantro_dev *vpu,
					       struct hantro_ctx *ctx,
					       struct vb2_buffer *src_buf,
					       struct vb2_buffer *dst_buf)
{ … }

static void
rockchip_vpu2_jpeg_enc_set_qtable(struct hantro_dev *vpu,
				  unsigned char *luma_qtable,
				  unsigned char *chroma_qtable)
{ … }

int rockchip_vpu2_jpeg_enc_run(struct hantro_ctx *ctx)
{ … }

void rockchip_vpu2_jpeg_enc_done(struct hantro_ctx *ctx)
{ … }