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/*
Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011 Her Majesty
the Queen in Right of Canada (Communications Research Center Canada)
Copyright (C) 2017
Matthias P. Braendli, matthias.braendli@mpb.li
http://opendigitalradio.org
*/
/*
This file is part of ODR-DabMod.
ODR-DabMod 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 of the
License, or (at your option) any later version.
ODR-DabMod 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 ODR-DabMod. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "Buffer.h"
#include "ThreadsafeQueue.h"
#include <cstddef>
#include <vector>
#include <memory>
#include <thread>
#include <atomic>
// All flowgraph elements derive from ModPlugin, or a variant of it.
// Some ModPlugins also support handling metadata.
struct frame_timestamp;
struct flowgraph_metadata {
std::shared_ptr<struct frame_timestamp> ts;
};
using meta_vec_t = std::vector<flowgraph_metadata>;
/* ModPlugins that support metadata derive from ModMetadata */
class ModMetadata {
public:
// Receives metadata from all inputs, and process them, and output
// a sequence of metadata.
virtual meta_vec_t process_metadata(const meta_vec_t& metadataIn) = 0;
};
/* Abstract base class for all flowgraph elements */
class ModPlugin
{
public:
virtual int process(
std::vector<Buffer*> dataIn,
std::vector<Buffer*> dataOut) = 0;
virtual const char* name() = 0;
virtual ~ModPlugin() = default;
};
/* Inputs are sources, the output buffers without reading any */
class ModInput : public ModPlugin
{
public:
virtual int process(
std::vector<Buffer*> dataIn,
std::vector<Buffer*> dataOut);
virtual int process(Buffer* dataOut) = 0;
};
/* Codecs are 1-input 1-output flowgraph plugins */
class ModCodec : public ModPlugin
{
public:
virtual int process(
std::vector<Buffer*> dataIn,
std::vector<Buffer*> dataOut);
virtual int process(Buffer* const dataIn, Buffer* dataOut) = 0;
};
/* Pipelined ModCodecs run their processing in a separate thread, and
* have a one-call-to-process() latency. Because of this latency, they
* must also handle the metadata
*/
class PipelinedModCodec : public ModCodec, public ModMetadata
{
public:
virtual int process(Buffer* const dataIn, Buffer* dataOut) final;
virtual const char* name() = 0;
virtual meta_vec_t process_metadata(const meta_vec_t& metadataIn) final;
protected:
// Once the instance implementing PipelinedModCodec has been constructed,
// it must call start_pipeline_thread()
void start_pipeline_thread(void);
// To avoid race conditions on teardown, plugins must call
// stop_pipeline_thread in their destructor.
void stop_pipeline_thread(void);
// The real processing must be implemented in internal_process
virtual int internal_process(Buffer* const dataIn, Buffer* dataOut) = 0;
private:
bool m_ready_to_output_data = false;
ThreadsafeQueue<std::shared_ptr<Buffer> > m_input_queue;
ThreadsafeQueue<std::shared_ptr<Buffer> > m_output_queue;
std::deque<meta_vec_t> m_metadata_fifo;
std::atomic<bool> m_running = ATOMIC_VAR_INIT(false);
std::thread m_thread;
void process_thread(void);
};
/* Muxes are N-input 1-output flowgraph plugins */
class ModMux : public ModPlugin
{
public:
virtual int process(
std::vector<Buffer*> dataIn,
std::vector<Buffer*> dataOut);
virtual int process(std::vector<Buffer*> dataIn, Buffer* dataOut) = 0;
};
/* Outputs do not create any output buffers */
class ModOutput : public ModPlugin
{
public:
virtual int process(
std::vector<Buffer*> dataIn,
std::vector<Buffer*> dataOut);
virtual int process(Buffer* dataIn) = 0;
};
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