Differential D2219 Diff 5542 src/qml/volumefeedback.cpp

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src/qml/volumefeedback.cpp

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		1		/*
		2		Copyright 2008 Helio Chissini de Castro <helio@kde.org>
		3		Copyright 2016 David Rosca <nowrep@gmail.com>
		4
		5		This library is free software; you can redistribute it and/or
		6		modify it under the terms of the GNU Lesser General Public
		7		License as published by the Free Software Foundation; either
		8		version 2.1 of the License, or (at your option) version 3, or any
		9		later version accepted by the membership of KDE e.V. (or its
		10		successor approved by the membership of KDE e.V.), which shall
		11		act as a proxy defined in Section 6 of version 3 of the license.
		12
		13		This library is distributed in the hope that it will be useful,
		14		but WITHOUT ANY WARRANTY; without even the implied warranty of
		15		MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
		16		Lesser General Public License for more details.
		17
		18		You should have received a copy of the GNU Lesser General Public
		19		License along with this library. If not, see <http://www.gnu.org/licenses/>.
		20		*/
		21
		22		#include "volumefeedback.h"
		23
		24		VolumeFeedback::VolumeFeedback(QObject *parent)
		25		: QObject(parent)
		26		{
		27		if (ca_context_create(&m_context) < 0) {
		28		m_context = nullptr;
		29		return;
		30		}
		31		if (ca_context_set_driver(m_context, "pulse") < 0) {
		32		ca_context_destroy(m_context);
		33		m_context = nullptr;
		34		return;
		35		}
		36		}
		37
		38		VolumeFeedback::~VolumeFeedback()
		39		{
		40		if (m_context) {
		41		ca_context_destroy(m_context);
		42		}
		43		}
		44
		45		bool VolumeFeedback::isValid() const
		46		{
		47		return m_context;
		48		}
		49
		50		void VolumeFeedback::play(quint32 sinkIndex)
		51		{
		52		if (!m_context) {
		53		return;
		54		}
		55
		56		int playing = 0;
		57		const int cindex = 2; // Note "2" is simply the index we've picked. It's somewhat irrelevant.
		58		ca_context_playing(m_context, cindex, &playing);
		59
		60		// NB Depending on how this is desired to work, we may want to simply
		61		// skip playing, or cancel the currently playing sound and play our
		62		// new one... for now, let's do the latter.
		63		if (playing) {
		64		ca_context_cancel(m_context, cindex);
		65		}
		66
		67		char dev[64];
		68		snprintf(dev, sizeof(dev), "%lu", (unsigned long) sinkIndex);
		69		ca_context_change_device(m_context, dev);
		70
		71		// Ideally we'd use something like ca_gtk_play_for_widget()...
		72		ca_context_play(
		73		m_context,
		74		cindex,
		75		CA_PROP_EVENT_DESCRIPTION, "Volume Control Feedback Sound",
		76		CA_PROP_EVENT_ID, "audio-volume-change",
		77		CA_PROP_CANBERRA_CACHE_CONTROL, "permanent",
		78		CA_PROP_CANBERRA_ENABLE, "1",
		79		nullptr
		80		);
		81
		82		ca_context_change_device(m_context, nullptr);
		83		}