cam: Rename BufferWriter to FileSink

Rename the BufferWriter class to FileSink to establish a common naming
scheme for all sinks.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>

1 files changed, 128 insertions, 0 deletions

diff --git a/src/cam/file_sink.cpp b/src/cam/file_sink.cpp
new file mode 100644
index 00000000..2d30694a
--- /dev/null
+++ b/src/cam/file_sink.cpp
@@ -0,0 +1,128 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * file_sink.cpp - File Sink
+ */
+
+#include <fcntl.h>
+#include <iomanip>
+#include <iostream>
+#include <sstream>
+#include <string.h>
+#include <sys/mman.h>
+#include <unistd.h>
+
+#include <libcamera/camera.h>
+
+#include "file_sink.h"
+
+using namespace libcamera;
+
+FileSink::FileSink(const std::string &pattern)
+	: pattern_(pattern)
+{
+}
+
+FileSink::~FileSink()
+{
+	for (auto &iter : mappedBuffers_) {
+		void *memory = iter.second.first;
+		unsigned int length = iter.second.second;
+		munmap(memory, length);
+	}
+	mappedBuffers_.clear();
+}
+
+int FileSink::configure(const libcamera::CameraConfiguration &config)
+{
+	int ret = FrameSink::configure(config);
+	if (ret < 0)
+		return ret;
+
+	streamNames_.clear();
+	for (unsigned int index = 0; index < config.size(); ++index) {
+		const StreamConfiguration &cfg = config.at(index);
+		streamNames_[cfg.stream()] = "stream" + std::to_string(index);
+	}
+
+	return 0;
+}
+
+void FileSink::mapBuffer(FrameBuffer *buffer)
+{
+	for (const FrameBuffer::Plane &plane : buffer->planes()) {
+		void *memory = mmap(NULL, plane.length, PROT_READ, MAP_SHARED,
+				    plane.fd.fd(), 0);
+
+		mappedBuffers_[plane.fd.fd()] =
+			std::make_pair(memory, plane.length);
+	}
+}
+
+bool FileSink::processRequest(Request *request)
+{
+	for (auto [stream, buffer] : request->buffers())
+		writeBuffer(stream, buffer);
+
+	return true;
+}
+
+void FileSink::writeBuffer(const Stream *stream, FrameBuffer *buffer)
+{
+	std::string filename;
+	size_t pos;
+	int fd, ret = 0;
+
+	if (!pattern_.empty())
+		filename = pattern_;
+
+	if (filename.empty() || filename.back() == '/')
+		filename += "frame-#.bin";
+
+	pos = filename.find_first_of('#');
+	if (pos != std::string::npos) {
+		std::stringstream ss;
+		ss << streamNames_[stream] << "-" << std::setw(6)
+		   << std::setfill('0') << buffer->metadata().sequence;
+		filename.replace(pos, 1, ss.str());
+	}
+
+	fd = open(filename.c_str(), O_CREAT | O_WRONLY |
+		  (pos == std::string::npos ? O_APPEND : O_TRUNC),
+		  S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
+	if (fd == -1) {
+		ret = -errno;
+		std::cerr << "failed to open file " << filename << ": "
+			  << strerror(-ret) << std::endl;
+		return;
+	}
+
+	for (unsigned int i = 0; i < buffer->planes().size(); ++i) {
+		const FrameBuffer::Plane &plane = buffer->planes()[i];
+		const FrameMetadata::Plane &meta = buffer->metadata().planes[i];
+
+		void *data = mappedBuffers_[plane.fd.fd()].first;
+		unsigned int length = std::min(meta.bytesused, plane.length);
+
+		if (meta.bytesused > plane.length)
+			std::cerr << "payload size " << meta.bytesused
+				  << " larger than plane size " << plane.length
+				  << std::endl;
+
+		ret = ::write(fd, data, length);
+		if (ret < 0) {
+			ret = -errno;
+			std::cerr << "write error: " << strerror(-ret)
+				  << std::endl;
+			break;
+		} else if (ret != (int)length) {
+			std::cerr << "write error: only " << ret
+				  << " bytes written instead of "
+				  << length << std::endl;
+			break;
+		}
+	}
+
+	close(fd);
+}