b0a0147f34
Some variables and structure members should be renamed to reflect the fact that they contain the number of channels in a track (channel count) or the actual channels used by a track (channel mask). Especially member "channels" of track control block (struct audio_track_cblk_t) is actually the number of channels (channels count). Change-Id: I220c8dede9fc00c8a5693389e790073b6ed307b8
85 lines
3.2 KiB
C++
85 lines
3.2 KiB
C++
/*
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* Copyright (C) 2007 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_AUDIO_TRACK_SHARED_H
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#define ANDROID_AUDIO_TRACK_SHARED_H
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#include <stdint.h>
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#include <sys/types.h>
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#include <utils/threads.h>
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namespace android {
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// ----------------------------------------------------------------------------
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#define THREAD_PRIORITY_AUDIO_CLIENT (ANDROID_PRIORITY_AUDIO)
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// Maximum cumulated timeout milliseconds before restarting audioflinger thread
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#define MAX_STARTUP_TIMEOUT_MS 3000 // Longer timeout period at startup to cope with A2DP init time
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#define MAX_RUN_TIMEOUT_MS 1000
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#define WAIT_PERIOD_MS 10
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struct audio_track_cblk_t
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{
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// The data members are grouped so that members accessed frequently and in the same context
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// are in the same line of data cache.
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Mutex lock;
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Condition cv;
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volatile uint32_t user;
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volatile uint32_t server;
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uint32_t userBase;
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uint32_t serverBase;
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void* buffers;
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uint32_t frameCount;
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// Cache line boundary
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uint32_t loopStart;
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uint32_t loopEnd;
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int loopCount;
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volatile union {
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uint16_t volume[2];
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uint32_t volumeLR;
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};
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uint32_t sampleRate;
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// NOTE: audio_track_cblk_t::frameSize is not equal to AudioTrack::frameSize() for
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// 8 bit PCM data: in this case, mCblk->frameSize is based on a sample size of
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// 16 bit because data is converted to 16 bit before being stored in buffer
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uint32_t frameSize;
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uint8_t channelCount;
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uint8_t flowControlFlag; // underrun (out) or overrrun (in) indication
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uint8_t out; // out equals 1 for AudioTrack and 0 for AudioRecord
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uint8_t forceReady;
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uint16_t bufferTimeoutMs; // Maximum cumulated timeout before restarting audioflinger
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uint16_t waitTimeMs; // Cumulated wait time
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// Cache line boundary (32 bytes)
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audio_track_cblk_t();
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uint32_t stepUser(uint32_t frameCount);
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bool stepServer(uint32_t frameCount);
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void* buffer(uint32_t offset) const;
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uint32_t framesAvailable();
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uint32_t framesAvailable_l();
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uint32_t framesReady();
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};
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// ----------------------------------------------------------------------------
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}; // namespace android
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#endif // ANDROID_AUDIO_TRACK_SHARED_H
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