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author | Glenn Kasten <gkasten@google.com> | 2012-03-23 18:54:19 -0700 |
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committer | Glenn Kasten <gkasten@google.com> | 2012-04-18 07:49:43 -0700 |
commit | 97b5d0d5b5ef766eb5dd680d05a5d199662d4ae0 (patch) | |
tree | a7042a97ac8019ba62a7c35ef9e11711caab7021 /services/audioflinger/FastMixerState.h | |
parent | 0845682ff93c9765b74b53dc404d0954efc28c2e (diff) | |
download | frameworks_av-97b5d0d5b5ef766eb5dd680d05a5d199662d4ae0.zip frameworks_av-97b5d0d5b5ef766eb5dd680d05a5d199662d4ae0.tar.gz frameworks_av-97b5d0d5b5ef766eb5dd680d05a5d199662d4ae0.tar.bz2 |
Fast mixer
Change-Id: I61552f83507e08e4c706076b9fb15362869e6265
Diffstat (limited to 'services/audioflinger/FastMixerState.h')
-rw-r--r-- | services/audioflinger/FastMixerState.h | 80 |
1 files changed, 80 insertions, 0 deletions
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 |