genode/repos/os/include/audio_out_session/client.h
2017-01-13 13:07:10 +01:00

158 lines
3.3 KiB
C++

/*
* \brief Client-side Audio_out-session
* \author Sebastian Sumpf
* \date 2012-12-20
*/
/*
* Copyright (C) 2012-2013 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
#ifndef _INCLUDE__AUDIO_OUT_SESSION__CLIENT_H_
#define _INCLUDE__AUDIO_OUT_SESSION__CLIENT_H_
#include <base/env.h>
#include <base/rpc_client.h>
#include <base/attached_dataspace.h>
#include <audio_out_session/audio_out_session.h>
namespace Audio_out {
struct Signal;
struct Session_client;
}
struct Audio_out::Signal
{
Genode::Signal_receiver recv;
Genode::Signal_context context;
Genode::Signal_context_capability cap;
Signal() : cap(recv.manage(&context)) { }
~Signal() { recv.dissolve(&context); }
void wait() { recv.wait_for_signal(); }
};
class Audio_out::Session_client : public Genode::Rpc_client<Session>
{
private:
Genode::Attached_dataspace _shared_ds;
Signal _progress;
Signal _alloc;
Genode::Signal_transmitter _data_avail;
public:
/**
* Constructor
*
* \param rm region map for attaching shared buffer
* \param session session capability
* \param alloc_signal true, install 'alloc_signal' receiver
* \param progress_signal true, install 'progress_signal' receiver
*/
Session_client(Genode::Region_map &rm,
Genode::Capability<Session> session,
bool alloc_signal, bool progress_signal)
:
Genode::Rpc_client<Session>(session),
_shared_ds(rm, call<Rpc_dataspace>()),
_data_avail(call<Rpc_data_avail_sigh>())
{
_stream = _shared_ds.local_addr<Stream>();
if (progress_signal)
progress_sigh(_progress.cap);
if (alloc_signal)
alloc_sigh(_alloc.cap);
}
/*************
** Signals **
*************/
void progress_sigh(Genode::Signal_context_capability sigh) {
call<Rpc_progress_sigh>(sigh); }
void alloc_sigh(Genode::Signal_context_capability sigh) {
call<Rpc_alloc_sigh>(sigh); }
Genode::Signal_context_capability data_avail_sigh() {
return Genode::Signal_context_capability(); }
/***********************
** Session interface **
***********************/
void start()
{
call<Rpc_start>();
/* reset tail pointer */
stream()->reset();
}
void stop() { call<Rpc_stop>(); }
/**********************************
** Session interface extensions **
**********************************/
/**
* Wait for progress signal
*/
void wait_for_progress()
{
if (!_progress.cap.valid()) {
Genode::warning("Progress signal is not installed, will not block "
"(enable in 'Audio_out::Connection')");
return;
}
_progress.wait();
}
/**
* Wait for allocation signal
*
* This can be used when the 'Stream' is full and the application wants
* to block until the stream has free elements again.
*/
void wait_for_alloc()
{
if (!_alloc.cap.valid()) {
Genode::warning("Alloc signal is not installed, will not block "
"(enable in 'Audio_out::Connection')");
return;
}
_alloc.wait();
}
/**
* Submit a packet
*/
void submit(Packet *packet)
{
bool empty = stream()->empty();
packet->_submit();
if (empty)
_data_avail.submit();
}
};
#endif /* _INCLUDE__AUDIO_OUT_SESSION__CLIENT_H_ */