[v3,2/9] rockchip: mpp: rkvdec: rbsp

Commit Message

ayaka April 10, 2019, 12:42 p.m. UTC

From: Randy Li <[e-mail]>

It is a bit writer.

Signed-off-by: Randy Li <[e-mail]>
---
 drivers/staging/rockchip-mpp/rkvdec/rbsp.c | 96 ++++++++++++++++++++++
 drivers/staging/rockchip-mpp/rkvdec/rbsp.h | 30 +++++++
 2 files changed, 126 insertions(+)
 create mode 100644 drivers/staging/rockchip-mpp/rkvdec/rbsp.c
 create mode 100644 drivers/staging/rockchip-mpp/rkvdec/rbsp.h

Patch

diff --git a/drivers/staging/rockchip-mpp/rkvdec/rbsp.c b/drivers/staging/rockchip-mpp/rkvdec/rbsp.c
new file mode 100644
index 000000000000..3fbc50e9bca1
--- /dev/null
+++ b/drivers/staging/rockchip-mpp/rkvdec/rbsp.c
@@ -0,0 +1,96 @@ 
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2012 Vista Silicon S.L.
+ * Copyright (C) 2019 Randy Li <[e-mail]>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <asm-generic/errno-base.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+
+#include "rbsp.h"
+
+int rbsp_init(struct rbsp *rbsp, void *buf, int size, int bit_pos)
+{
+	if (!buf)
+		return -EINVAL;
+	if (DIV_ROUND_UP(bit_pos, 32) >= size)
+		return -EINVAL;
+
+	rbsp->buf = buf;
+	rbsp->size = size >> 2;
+	rbsp->pos = bit_pos;
+
+	return 0;
+}
+
+static inline int rbsp_read_bit(struct rbsp *rbsp)
+{
+	int shift = rbsp->pos % 32;
+	int ofs = rbsp->pos++ / 32;
+
+	if (ofs >= rbsp->size)
+		return -EINVAL;
+
+	return (rbsp->buf[ofs] >> shift) & 1;
+}
+
+static inline int rbsp_write_bit(struct rbsp *rbsp, int bit)
+{
+	int shift = rbsp->pos % 32;
+	int ofs = rbsp->pos++ / 32;
+
+	if (ofs >= rbsp->size)
+		return -EINVAL;
+
+	rbsp->buf[ofs] &= ~(1 << shift);
+	rbsp->buf[ofs] |= bit << shift;
+
+	return 0;
+}
+
+int rbsp_write_bits(struct rbsp *rbsp, int num, int value)
+{
+	int shift = rbsp->pos % 32;
+	int ofs = rbsp->pos / 32;
+
+	if (ofs >= rbsp->size)
+		return -EINVAL;
+
+	if (num + shift >= 32) {
+		u32 lbits = 32 - shift;
+		u32 hbits = num + shift - 32;
+
+		rbsp->buf[ofs] &= ~(((1 << lbits) - 1) << shift);
+		rbsp->buf[ofs] |= value << shift;
+
+		value >>= (32 - shift);
+		rbsp->buf[ofs + 1] &= ~(((1 << hbits) - 1));
+		rbsp->buf[ofs + 1] |= value;
+	} else {
+		rbsp->buf[ofs] &= ~(((1 << num) - 1) << shift);
+		rbsp->buf[ofs] |= value << shift;
+	}
+
+	rbsp->pos += num;
+
+	return 0;
+}
+
+int rbsp_write_flag(struct rbsp *rbsp, int value)
+{
+	if (value)
+		return rbsp_write_bit(rbsp, BIT(0));
+	else
+		return rbsp_write_bit(rbsp, 0);
+}
diff --git a/drivers/staging/rockchip-mpp/rkvdec/rbsp.h b/drivers/staging/rockchip-mpp/rkvdec/rbsp.h
new file mode 100644
index 000000000000..d87c582bfd41
--- /dev/null
+++ b/drivers/staging/rockchip-mpp/rkvdec/rbsp.h
@@ -0,0 +1,30 @@ 
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2012 Vista Silicon S.L.
+ * Copyright (C) 2019 Randy Li <[e-mail]>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef _RBSP_H_
+#define _RBSP_H_
+
+struct rbsp {
+	u32 *buf;
+	int size;
+	int pos;
+};
+
+int rbsp_init(struct rbsp *rbsp, void *buf, int size, int bit_pos);
+int rbsp_write_flag(struct rbsp *rbsp, int bit);
+int rbsp_write_bits(struct rbsp *rbsp, int num, int value);
+
+#endif