Move the low level audio integration back into Qt Multimedia

Those integrations are selected at compile time and not dependent
on native vs ffmpeg backend. Because of that we can move them
back into Qt Multimedia directly.

This will simplify and improve a couple of things:

* We don't need to build the audio code twice (once per plugins)
* Low level audio is always available even if you choose not to
  ship a large backend for audio/video decoding and recording
* We can use Qt Multimedia as a backend for other modules requiring
  audio only without bloating things there (e.g. for Qt Speech)
* We can directly integrate support for 3D audio and headphone
  spatialization into Qt Multimedia without requiring an additional
  module for that.

To do so, we need to remove the camera handling from
QPlatformMediaDevices. This is only partially done in this
commit (by adding a QPlatformVideoDevices class), and will
be further cleaned up in followup commits.

Change-Id: Ib4a33d7255faaf26dd825527786eae10ed283490
Reviewed-by: Lars Knoll <lars.knoll@qt.io>

1 files changed, 87 insertions, 0 deletions

diff --git a/src/multimedia/qnx/qqnxaudioutils_p.h b/src/multimedia/qnx/qqnxaudioutils_p.h
new file mode 100644
index 000000000..5eabf630d
--- /dev/null
+++ b/src/multimedia/qnx/qqnxaudioutils_p.h
@@ -0,0 +1,87 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 Research In Motion
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QNXAUDIOUTILS_H
+#define QNXAUDIOUTILS_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include "private/qaudiosystem_p.h"
+
+#include <memory>
+#include <optional>
+
+#include <sys/asoundlib.h>
+
+QT_BEGIN_NAMESPACE
+
+namespace QnxAudioUtils
+{
+    snd_pcm_channel_params_t formatToChannelParams(const QAudioFormat &format, QAudioDevice::Mode mode, int fragmentSize);
+
+    struct HandleDeleter
+    {
+        void operator()(snd_pcm_t *h) { if (h) snd_pcm_close(h); }
+    };
+
+    using HandleUniquePtr = std::unique_ptr<snd_pcm_t, HandleDeleter>;
+    HandleUniquePtr openPcmDevice(const QByteArray &id, QAudioDevice::Mode mode);
+
+    std::optional<snd_pcm_channel_info_t> pcmChannelInfo(snd_pcm_t *handle, QAudioDevice::Mode mode);
+    std::optional<snd_pcm_channel_info_t> pcmChannelInfo(const QByteArray &device, QAudioDevice::Mode mode);
+
+    std::optional<snd_pcm_channel_setup_t> pcmChannelSetup(snd_pcm_t *handle, QAudioDevice::Mode mode);
+    std::optional<snd_pcm_channel_setup_t> pcmChannelSetup(const QByteArray &device, QAudioDevice::Mode mode);
+
+    std::optional<snd_pcm_channel_status_t> pcmChannelStatus(snd_pcm_t *handle, QAudioDevice::Mode mode);
+    std::optional<snd_pcm_channel_status_t> pcmChannelStatus(const QByteArray &device, QAudioDevice::Mode mode);
+}
+
+QT_END_NAMESPACE
+
+#endif