AudioTrackShared.h revision 1179bc9b0e3d17c984e8f4ad38561c049dd102fa 
1/*
2 * Copyright (C) 2007 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef ANDROID_AUDIO_TRACK_SHARED_H
18#define ANDROID_AUDIO_TRACK_SHARED_H
19
20#include <stdint.h>
21#include <sys/types.h>
22
23#include <utils/threads.h>
24
25namespace android {
26
27// ----------------------------------------------------------------------------
28
29#define MAX_SAMPLE_RATE     65535
30#define THREAD_PRIORITY_AUDIO_CLIENT (ANDROID_PRIORITY_AUDIO)
31// Maximum cumulated timeout milliseconds before restarting audioflinger thread
32#define MAX_STARTUP_TIMEOUT_MS  3000    // Longer timeout period at startup to cope with A2DP init time
33#define MAX_RUN_TIMEOUT_MS      1000
34#define WAIT_PERIOD_MS          10
35
36
37struct audio_track_cblk_t
38{
39
40    // The data members are grouped so that members accessed frequently and in the same context
41    // are in the same line of data cache.
42                Mutex       lock;
43                Condition   cv;
44    volatile    uint32_t    user;
45    volatile    uint32_t    server;
46                uint32_t    userBase;
47                uint32_t    serverBase;
48    void*       buffers;
49    uint32_t    frameCount;
50    // Cache line boundary
51    uint32_t    loopStart;
52    uint32_t    loopEnd;
53    int         loopCount;
54    volatile    union {
55                    uint16_t    volume[2];
56                    uint32_t    volumeLR;
57                };
58                uint16_t    sampleRate;
59                uint16_t    channels;
60                int16_t     flowControlFlag; // underrun (out) or overrrun (in) indication
61                uint8_t     out;        // out equals 1 for AudioTrack and 0 for AudioRecord
62                uint8_t     forceReady;
63                uint16_t    bufferTimeoutMs; // Maximum cumulated timeout before restarting audioflinger
64                uint16_t    waitTimeMs;      // Cumulated wait time
65                // Padding ensuring that data buffer starts on a cache line boundary (32 bytes).
66                // See AudioFlinger::TrackBase constructor
67                int32_t     Padding[1];
68                // Cache line boundary
69
70                            audio_track_cblk_t();
71                uint32_t    stepUser(uint32_t frameCount);
72                bool        stepServer(uint32_t frameCount);
73                void*       buffer(uint32_t offset) const;
74                uint32_t    framesAvailable();
75                uint32_t    framesAvailable_l();
76                uint32_t    framesReady();
77};
78
79
80// ----------------------------------------------------------------------------
81
82}; // namespace android
83
84#endif // ANDROID_AUDIO_TRACK_SHARED_H
85