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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) Collabora, Ltd.
*
* Based on GSPCA and CODA drivers:
* Copyright (C) Jean-Francois Moine (http://moinejf.free.fr)
* Copyright (C) 2014 Philipp Zabel, Pengutronix
*/
#include <linux/align.h>
#include <linux/build_bug.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <media/v4l2-jpeg.h>
#include "hantro_jpeg.h"
#include "hantro.h"
#define LUMA_QUANT_OFF 25
#define CHROMA_QUANT_OFF 90
#define HEIGHT_OFF 159
#define WIDTH_OFF 161
#define HUFF_LUMA_DC_OFF 178
#define HUFF_LUMA_AC_OFF 211
#define HUFF_CHROMA_DC_OFF 394
#define HUFF_CHROMA_AC_OFF 427
static const u32 hw_reorder[] = {
0, 8, 16, 24, 1, 9, 17, 25,
32, 40, 48, 56, 33, 41, 49, 57,
2, 10, 18, 26, 3, 11, 19, 27,
34, 42, 50, 58, 35, 43, 51, 59,
4, 12, 20, 28, 5, 13, 21, 29,
36, 44, 52, 60, 37, 45, 53, 61,
6, 14, 22, 30, 7, 15, 23, 31,
38, 46, 54, 62, 39, 47, 55, 63
};
/* For simplicity, we keep a pre-formatted JPEG header,
* and we'll use fixed offsets to change the width, height
* quantization tables, etc.
*/
static const unsigned char hantro_jpeg_header[] = {
/* SOI */
0xff, 0xd8,
/* JFIF-APP0 */
0xff, 0xe0, 0x00, 0x10, 0x4a, 0x46, 0x49, 0x46,
0x00, 0x01, 0x01, 0x00, 0x00, 0x01, 0x00, 0x01,
0x00, 0x00,
/* DQT */
0xff, 0xdb, 0x00, 0x84,
0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x01,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
/* SOF */
0xff, 0xc0, 0x00, 0x11, 0x08, 0x00, 0xf0, 0x01,
0x40, 0x03, 0x01, 0x22, 0x00, 0x02, 0x11, 0x01,
0x03, 0x11, 0x01,
/* DHT */
0xff, 0xc4, 0x00, 0x1f, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
/* DHT */
0xff, 0xc4, 0x00, 0xb5, 0x10,
0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
/* DHT */
0xff, 0xc4, 0x00, 0x1f, 0x01,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
/* DHT */
0xff, 0xc4, 0x00, 0xb5, 0x11,
0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
/* COM */
0xff, 0xfe, 0x00, 0x03, 0x00,
/* SOS */
0xff, 0xda, 0x00, 0x0c, 0x03, 0x01, 0x00, 0x02,
0x11, 0x03, 0x11, 0x00, 0x3f, 0x00,
};
/*
* JPEG_HEADER_SIZE is used in other parts of the driver in lieu of
* "sizeof(hantro_jpeg_header)". The two must be equal.
*/
static_assert(sizeof(hantro_jpeg_header) == JPEG_HEADER_SIZE);
/*
* hantro_jpeg_header is padded with a COM segment, so that the payload
* of the SOS segment (the entropy-encoded image scan), which should
* trail the whole header, is 8-byte aligned for the hardware to write
* to directly.
*/
static_assert(IS_ALIGNED(sizeof(hantro_jpeg_header), 8),
"Hantro JPEG header size needs to be 8-byte aligned.");
static unsigned char jpeg_scale_qp(const unsigned char qp, int scale)
{
unsigned int temp;
temp = DIV_ROUND_CLOSEST((unsigned int)qp * scale, 100);
if (temp <= 0)
temp = 1;
if (temp > 255)
temp = 255;
return (unsigned char)temp;
}
static void
jpeg_scale_quant_table(unsigned char *file_q_tab,
unsigned char *reordered_q_tab,
const unsigned char *tab, int scale)
{
int i;
BUILD_BUG_ON(ARRAY_SIZE(v4l2_jpeg_zigzag_scan_index) != JPEG_QUANT_SIZE);
BUILD_BUG_ON(ARRAY_SIZE(hw_reorder) != JPEG_QUANT_SIZE);
for (i = 0; i < JPEG_QUANT_SIZE; i++) {
file_q_tab[i] = jpeg_scale_qp(tab[v4l2_jpeg_zigzag_scan_index[i]], scale);
reordered_q_tab[i] = jpeg_scale_qp(tab[hw_reorder[i]], scale);
}
}
static void jpeg_set_quality(struct hantro_jpeg_ctx *ctx)
{
int scale;
/*
* Non-linear scaling factor:
* [5,50] -> [1000..100], [51,100] -> [98..0]
*/
if (ctx->quality < 50)
scale = 5000 / ctx->quality;
else
scale = 200 - 2 * ctx->quality;
BUILD_BUG_ON(ARRAY_SIZE(v4l2_jpeg_ref_table_luma_qt) != JPEG_QUANT_SIZE);
BUILD_BUG_ON(ARRAY_SIZE(v4l2_jpeg_ref_table_chroma_qt) != JPEG_QUANT_SIZE);
BUILD_BUG_ON(ARRAY_SIZE(ctx->hw_luma_qtable) != JPEG_QUANT_SIZE);
BUILD_BUG_ON(ARRAY_SIZE(ctx->hw_chroma_qtable) != JPEG_QUANT_SIZE);
jpeg_scale_quant_table(ctx->buffer + LUMA_QUANT_OFF,
ctx->hw_luma_qtable,
(const unsigned char *)v4l2_jpeg_ref_table_luma_qt, scale);
jpeg_scale_quant_table(ctx->buffer + CHROMA_QUANT_OFF,
ctx->hw_chroma_qtable,
(const unsigned char *)v4l2_jpeg_ref_table_chroma_qt, scale);
}
void hantro_jpeg_header_assemble(struct hantro_jpeg_ctx *ctx)
{
char *buf = ctx->buffer;
memcpy(buf, hantro_jpeg_header,
sizeof(hantro_jpeg_header));
buf[HEIGHT_OFF + 0] = ctx->height >> 8;
buf[HEIGHT_OFF + 1] = ctx->height;
buf[WIDTH_OFF + 0] = ctx->width >> 8;
buf[WIDTH_OFF + 1] = ctx->width;
memcpy(buf + HUFF_LUMA_DC_OFF, v4l2_jpeg_ref_table_luma_dc_ht, V4L2_JPEG_REF_HT_DC_LEN);
memcpy(buf + HUFF_LUMA_AC_OFF, v4l2_jpeg_ref_table_luma_ac_ht, V4L2_JPEG_REF_HT_AC_LEN);
memcpy(buf + HUFF_CHROMA_DC_OFF, v4l2_jpeg_ref_table_chroma_dc_ht, V4L2_JPEG_REF_HT_DC_LEN);
memcpy(buf + HUFF_CHROMA_AC_OFF, v4l2_jpeg_ref_table_chroma_ac_ht, V4L2_JPEG_REF_HT_AC_LEN);
jpeg_set_quality(ctx);
}
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