pica-client: add TonePlayer for classic telephony call tones

Wires ringback, busy, special-information (unreachable) and an
electromechanical-bell incoming ringtone into
AudioVideoCallController, each played on its own QThread since
TonePlayer::play() blocks. Device selection reads audio.playback_device
and audio.ring_device from Settings so it follows what's configured in
SettingsDialog.

Centralizes the FFmpeg libavdevice output driver name
(alsa/audiotoolbox/dsound) in AudioDevice::PlatformDriverName() rather
than hardcoding ALSA, so it can also back capture/playback later.

Adds toneplayer.{h,cpp} to the autotools build and adds the missing
GPL v3 header to the touched files that lacked it.

1 files changed, 29 insertions, 0 deletions

diff --git a/pica-client/audiodevice.cpp b/pica-client/audiodevice.cpp
index d2995e3..17dd1b9 100644
--- a/pica-client/audiodevice.cpp
+++ b/pica-client/audiodevice.cpp
@@ -1,3 +1,19 @@
+/*
+	(c) Copyright  2012 - 2018 Anton Sviridenko
+	https://picapica.im
+
+	This program 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, version 3.
+
+	This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
 #include "audiodevice.h"
 
 #ifdef Q_OS_LINUX
@@ -68,3 +84,16 @@ QList<MediaDeviceInfo> AudioDevice::Enumerate(enum MediaDeviceStreamDirection di
 #endif
 	return result;
 }
+
+QString AudioDevice::PlatformDriverName()
+{
+#if defined(Q_OS_LINUX)
+	return QStringLiteral("alsa");
+#elif defined(Q_OS_MACOS) || defined(Q_OS_MAC)
+	return QStringLiteral("audiotoolbox");
+#elif defined(Q_OS_WIN)
+	return QStringLiteral("dsound");
+#else
+	return QStringLiteral("oss");
+#endif
+}