Emery Hemingway
5e8bc9ef51
Define a unified packet-buffer format for both Audio_out and Audio_in sessions. This allows an Audio_out and an Audio_in client to exchange packets with a common buffer and lexicon. The sessions have also been stripped down to a minimum. The 'progress' and 'data_avail' signal handlers have been replaced with a single 'progress' signal sent by Audio_in and received by Audio_in. The Audio_in session has a reset signal delivered to the client to indicate that the progress signal handler has been replaced (dubious). These changes reflect a different relationship between the two sessions. Drivers that play audio are now Audio_in clients and drive the rate that packets can be consumed by sending progress signals. Ref #2858
124 lines
2.8 KiB
C++
124 lines
2.8 KiB
C++
/*
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* \brief Server-side Audio_in session interface
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* \author Josef Soentgen
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* \author Emery Hemingway
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* \date 2015-05-08
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*/
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/*
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* Copyright (C) 2015-2018 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _INCLUDE__AUDIO_IN_SESSION__RPC_OBJECT_H_
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#define _INCLUDE__AUDIO_IN_SESSION__RPC_OBJECT_H_
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/* Genode includes */
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#include <base/env.h>
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#include <base/rpc_server.h>
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#include <audio/buffer.h>
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#include <audio_in_session/audio_in_session.h>
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namespace Audio_in { class Session_rpc_object; }
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class Audio_in::Session_rpc_object : public Genode::Rpc_object<Audio_in::Session,
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Session_rpc_object>
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{
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protected:
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Audio::Stream_buffer &_buffer;
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Genode::Signal_context_capability _data_cap;
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Genode::Signal_context_capability _progress_cap { };
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Genode::Signal_context_capability _overrun_cap { };
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Genode::Signal_context_capability _reset_cap { };
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bool _stopped; /* state */
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public:
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Session_rpc_object(Audio::Stream_buffer &buffer,
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Genode::Signal_context_capability data_cap)
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:
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_buffer(buffer), _data_cap(data_cap), _stopped(true)
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{ }
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Stream_sink &stream() { return _buffer.stream_sink(); }
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/**************
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** Signals **
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**************/
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void progress_sigh(Genode::Signal_context_capability sigh) override {
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_progress_cap = sigh; }
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void overrun_sigh(Genode::Signal_context_capability sigh) override {
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_overrun_cap = sigh; }
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void reset_sigh(Genode::Signal_context_capability sigh) override {
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_reset_cap = sigh; }
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Genode::Signal_context_capability data_avail_sigh() override {
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return _data_cap; }
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/***********************
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** Session interface **
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***********************/
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void start() { _stopped = false; }
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void stop() { _stopped = true; }
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Genode::Dataspace_capability dataspace() {
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return _buffer.cap(); }
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/**********************************
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** Session interface extensions **
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**********************************/
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/**
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* Send 'progress' signal
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*/
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void progress_submit()
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{
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if (_progress_cap.valid())
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Genode::Signal_transmitter(_progress_cap).submit();
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}
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/**
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* Send 'overrun' signal
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*/
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void overrun_submit()
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{
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if (_overrun_cap.valid())
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Genode::Signal_transmitter(_overrun_cap).submit();
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}
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/**
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* Send 'reset' signal
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*/
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void send_reset()
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{
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if (_reset_cap.valid())
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Genode::Signal_transmitter(_reset_cap).submit();
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}
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/**
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* Return true if client state is stopped
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*/
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bool stopped() const { return _stopped; }
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/**
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* Return true if client session is active
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*/
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bool active() const { return !_stopped; }
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};
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#endif /* _INCLUDE__AUDIO_IN_SESSION__RPC_OBJECT_H_ */
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