Fast mixer
Change-Id: I61552f83507e08e4c706076b9fb15362869e6265
diff --git a/services/audioflinger/FastMixerState.h b/services/audioflinger/FastMixerState.h
new file mode 100644
index 0000000..64171ac
--- /dev/null
+++ b/services/audioflinger/FastMixerState.h
@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_AUDIO_FAST_MIXER_STATE_H
+#define ANDROID_AUDIO_FAST_MIXER_STATE_H
+
+#include "AudioBufferProvider.h"
+#include "NBAIO.h"
+
+namespace android {
+
+struct FastMixerDumpState;
+
+class VolumeProvider {
+public:
+ // Return the track volume in U4_12 format: left in lower half, right in upper half. The
+ // provider implementation is responsible for validating that the return value is in range.
+ virtual uint32_t getVolumeLR() = 0;
+protected:
+ VolumeProvider() { }
+ virtual ~VolumeProvider() { }
+};
+
+// Represents the state of a fast track
+struct FastTrack {
+ FastTrack();
+ /*virtual*/ ~FastTrack();
+
+ AudioBufferProvider* mBufferProvider; // must not be NULL
+ VolumeProvider* mVolumeProvider; // optional; if NULL then full-scale
+ int mGeneration; // increment when any field is assigned
+};
+
+// Represents a single state of the fast mixer
+struct FastMixerState {
+ FastMixerState();
+ /*virtual*/ ~FastMixerState();
+
+ static const unsigned kMaxFastTracks = 8; // must be between 2 and 32 inclusive
+
+ // all pointer fields use raw pointers; objects are owned and ref-counted by the normal mixer
+ FastTrack mFastTracks[kMaxFastTracks];
+ int mFastTracksGen; // increment when any mFastTracks[i].mGeneration is incremented
+ unsigned mTrackMask; // bit i is set if and only if mFastTracks[i] != NULL
+ NBAIO_Sink* mOutputSink; // HAL output device, must already be negotiated
+ int mOutputSinkGen; // increment when mOutputSink is assigned
+ size_t mFrameCount; // number of frames per fast mix buffer
+ enum Command {
+ INITIAL = 0, // used only for the initial state
+ HOT_IDLE = 1, // do nothing
+ COLD_IDLE = 2, // wait for the futex
+ IDLE = 3, // either HOT_IDLE or COLD_IDLE
+ EXIT = 4, // exit from thread
+ // The following commands also process configuration changes, and can be "or"ed:
+ MIX = 0x8, // mix tracks
+ WRITE = 0x10, // write to output sink
+ MIX_WRITE = 0x18, // mix tracks and write to output sink
+ } mCommand;
+ int32_t* mColdFutexAddr; // for COLD_IDLE only, pointer to the associated futex
+ unsigned mColdGen; // increment when COLD_IDLE is requested so it's only performed once
+ // This might be a one-time configuration rather than per-state
+ FastMixerDumpState* mDumpState; // if non-NULL, then update dump state periodically
+}; // struct FastMixerState
+
+} // namespace android
+
+#endif // ANDROID_AUDIO_FAST_MIXER_STATE_H