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/* -*- c++ -*- */
/*
* Copyright 2012 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* GNU Radio 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.
*
* You should have received a copy of the GNU General Public License
* along with GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef INCLUDED_BLOCKS_FILE_META_SINK_H
#define INCLUDED_BLOCKS_FILE_META_SINK_H
#include <blocks/api.h>
#include <gr_sync_block.h>
namespace gr {
namespace blocks {
const char METADATA_VERSION = 0;
const size_t METADATA_HEADER_SIZE = 149;
enum gr_file_types {
GR_FILE_BYTE=0,
GR_FILE_CHAR=0,
GR_FILE_SHORT=1,
GR_FILE_INT,
GR_FILE_LONG,
GR_FILE_LONG_LONG,
GR_FILE_FLOAT,
GR_FILE_DOUBLE,
};
/*!
* \brief Write stream to file with meta-data headers.
* \ingroup sink_blk
*
* These files represent data as binary information in between
* meta-data headers. The headers contain information about the
* type of data and properties of the data in the next segment of
* samples. The information includes:
*
* rx_rate (double): sample rate of data.
* rx_time (uint64_t, double): time stamp of first sample in segment.
* size (uint32_t): item size in bytes.
* type (gr_file_types as int32_t): data type.
* cplx (bool): Is data complex?
* strt (uint64_t): Starting byte of data in this segment.
* bytes (uint64_t): Size in bytes of data in this segment.
*
* Tags can be sent to the file to update the information, which
* will create a new header. Headers are found by searching from
* the first header (at position 0 in the file) and reading where
* the data segment starts plus the data segment size. Following
* will either be a new header or EOF.
*/
class BLOCKS_API file_meta_sink : virtual public gr_sync_block
{
public:
// gr::blocks::file_meta_sink::sptr
typedef boost::shared_ptr<file_meta_sink> sptr;
/*!
* \brief Create a meta-data file sink.
*
* \param itemsize (size_t): Size of data type.
* \param filename (string): Name of file to write data to.
* \param samp_rate (double): Sample rate of data. If sample rate will be
* set by a tag, such as rx_tag from a UHD source, this is
* basically ignored.
* \param relative_rate (double): Rate chance from source of sample
* rate tag to sink.
* \param type (gr_file_types): Data type (int, float, etc.)
* \param complex (bool): If data stream is complex
* \param max_segment_size (size_t): Length of a single segment
* before the header is repeated (in items).
* \param extra_dict (string): a serialized PMT dictionary of extra
* information. Currently not supported.
* \param detached_header (bool): Set to true to store the header
* info in a separate file (named filename.hdr)
*/
static sptr make(size_t itemsize, const std::string &filename,
double samp_rate=1, double relative_rate=1,
gr_file_types type=GR_FILE_FLOAT, bool complex=true,
size_t max_segment_size=1000000,
const std::string &extra_dict="",
bool detached_header=false);
virtual bool open(const std::string &filename) = 0;
virtual void close() = 0;
virtual void do_update() = 0;
virtual void set_unbuffered(bool unbuffered) = 0;
};
} /* namespace blocks */
} /* namespace gr */
#endif /* INCLUDED_BLOCKS_FILE_META_SINK_H */
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