c89cfa534b
With the buffer allocator in use it's possible to cache the dmabuf memory mappings when starting the camera instead of mapping and unmapping them each time. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
89 lines
1.9 KiB
C++
89 lines
1.9 KiB
C++
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright (C) 2019, Google Inc.
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*
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* buffer_writer.cpp - Buffer writer
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*/
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#include <fcntl.h>
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#include <iomanip>
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#include <iostream>
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#include <sstream>
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#include <string.h>
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#include <sys/mman.h>
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#include <unistd.h>
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#include "buffer_writer.h"
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using namespace libcamera;
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BufferWriter::BufferWriter(const std::string &pattern)
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: pattern_(pattern)
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{
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}
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BufferWriter::~BufferWriter()
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{
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for (auto &iter : mappedBuffers_) {
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void *memory = iter.second.first;
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unsigned int length = iter.second.second;
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munmap(memory, length);
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}
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mappedBuffers_.clear();
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}
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void BufferWriter::mapBuffer(FrameBuffer *buffer)
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{
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for (const FrameBuffer::Plane &plane : buffer->planes()) {
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void *memory = mmap(NULL, plane.length, PROT_READ, MAP_SHARED,
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plane.fd.fd(), 0);
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mappedBuffers_[plane.fd.fd()] =
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std::make_pair(memory, plane.length);
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}
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}
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int BufferWriter::write(FrameBuffer *buffer, const std::string &streamName)
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{
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std::string filename;
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size_t pos;
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int fd, ret = 0;
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filename = pattern_;
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pos = filename.find_first_of('#');
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if (pos != std::string::npos) {
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std::stringstream ss;
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ss << streamName << "-" << std::setw(6)
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<< std::setfill('0') << buffer->metadata().sequence;
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filename.replace(pos, 1, ss.str());
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}
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fd = open(filename.c_str(), O_CREAT | O_WRONLY |
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(pos == std::string::npos ? O_APPEND : O_TRUNC),
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S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
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if (fd == -1)
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return -errno;
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for (const FrameBuffer::Plane &plane : buffer->planes()) {
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void *data = mappedBuffers_[plane.fd.fd()].first;
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unsigned int length = plane.length;
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ret = ::write(fd, data, length);
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if (ret < 0) {
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ret = -errno;
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std::cerr << "write error: " << strerror(-ret)
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<< std::endl;
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break;
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} else if (ret != (int)length) {
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std::cerr << "write error: only " << ret
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<< " bytes written instead of "
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<< length << std::endl;
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break;
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}
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}
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close(fd);
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return ret;
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}
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