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path: root/drivers/media/platform/verisilicon/hantro_jpeg.c
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Diffstat (limited to 'drivers/media/platform/verisilicon/hantro_jpeg.c')
-rw-r--r--drivers/media/platform/verisilicon/hantro_jpeg.c245
1 files changed, 245 insertions, 0 deletions
diff --git a/drivers/media/platform/verisilicon/hantro_jpeg.c b/drivers/media/platform/verisilicon/hantro_jpeg.c
new file mode 100644
index 000000000000..13a60638e43f
--- /dev/null
+++ b/drivers/media/platform/verisilicon/hantro_jpeg.c
@@ -0,0 +1,245 @@
+// 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);
+}
generated by cgit (git 2.34.1) at 2025-12-26 02:07:34 +0000