0db2c8dc75
Initial implementation of the Raspberry Pi (BCM2835) libcamera IPA and associated libraries. All code is licensed under the BSD-2-Clause terms. Copyright (c) 2019-2020 Raspberry Pi Trading Ltd. Signed-off-by: Naushir Patuck <naush@raspberrypi.com> Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
102 lines
2.9 KiB
C++
102 lines
2.9 KiB
C++
/* SPDX-License-Identifier: BSD-2-Clause */
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/*
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* Copyright (C) 2019, Raspberry Pi (Trading) Limited
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*
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* md_parser.cpp - image sensor metadata parsers
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*/
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#include <assert.h>
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#include <map>
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#include <string.h>
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#include "md_parser.hpp"
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using namespace RPi;
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// This function goes through the embedded data to find the offsets (not
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// values!), in the data block, where the values of the given registers can
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// subsequently be found.
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// Embedded data tag bytes, from Sony IMX219 datasheet but general to all SMIA
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// sensors, I think.
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#define LINE_START 0x0a
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#define LINE_END_TAG 0x07
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#define REG_HI_BITS 0xaa
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#define REG_LOW_BITS 0xa5
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#define REG_VALUE 0x5a
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#define REG_SKIP 0x55
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MdParserSmia::ParseStatus MdParserSmia::findRegs(unsigned char *data,
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uint32_t regs[], int offsets[],
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unsigned int num_regs)
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{
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assert(num_regs > 0);
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if (data[0] != LINE_START)
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return NO_LINE_START;
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unsigned int current_offset = 1; // after the LINE_START
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unsigned int current_line_start = 0, current_line = 0;
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unsigned int reg_num = 0, first_reg = 0;
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ParseStatus retcode = PARSE_OK;
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while (1) {
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int tag = data[current_offset++];
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if ((bits_per_pixel_ == 10 &&
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(current_offset + 1 - current_line_start) % 5 == 0) ||
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(bits_per_pixel_ == 12 &&
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(current_offset + 1 - current_line_start) % 3 == 0)) {
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if (data[current_offset++] != REG_SKIP)
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return BAD_DUMMY;
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}
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int data_byte = data[current_offset++];
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//printf("Offset %u, tag 0x%02x data_byte 0x%02x\n", current_offset-1, tag, data_byte);
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if (tag == LINE_END_TAG) {
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if (data_byte != LINE_END_TAG)
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return BAD_LINE_END;
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if (num_lines_ && ++current_line == num_lines_)
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return MISSING_REGS;
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if (line_length_bytes_) {
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current_offset =
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current_line_start + line_length_bytes_;
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// Require whole line to be in the buffer (if buffer size set).
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if (buffer_size_bytes_ &&
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current_offset + line_length_bytes_ >
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buffer_size_bytes_)
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return MISSING_REGS;
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if (data[current_offset] != LINE_START)
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return NO_LINE_START;
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} else {
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// allow a zero line length to mean "hunt for the next line"
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while (data[current_offset] != LINE_START &&
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current_offset < buffer_size_bytes_)
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current_offset++;
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if (current_offset == buffer_size_bytes_)
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return NO_LINE_START;
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}
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// inc current_offset to after LINE_START
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current_line_start =
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current_offset++;
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} else {
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if (tag == REG_HI_BITS)
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reg_num = (reg_num & 0xff) | (data_byte << 8);
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else if (tag == REG_LOW_BITS)
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reg_num = (reg_num & 0xff00) | data_byte;
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else if (tag == REG_SKIP)
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reg_num++;
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else if (tag == REG_VALUE) {
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while (reg_num >=
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// assumes registers are in order...
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regs[first_reg]) {
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if (reg_num == regs[first_reg])
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offsets[first_reg] =
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current_offset - 1;
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if (++first_reg == num_regs)
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return retcode;
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}
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reg_num++;
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} else
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return ILLEGAL_TAG;
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}
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}
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}
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