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The Android Open Source Project2729ea92008-10-21 07:00:00 -07001/*
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
32struct audio_track_cblk_t
33{
34 enum {
35 SEQUENCE_MASK = 0xFFFFFF00,
36 BUFFER_MASK = 0x000000FF
37 };
38
39 Mutex lock;
40 Condition cv;
41 volatile uint32_t user;
42 volatile uint32_t server;
43 volatile union {
44 uint16_t volume[2];
45 uint32_t volumeLR;
46 };
47 uint16_t sampleRate;
48 uint16_t reserved;
49
50 void* buffers;
51 size_t size;
52
53 audio_track_cblk_t();
54 uint32_t stepUser(int bufferCount);
55 bool stepServer(int bufferCount);
56 void* buffer(int id) const;
57};
58
59
60// ----------------------------------------------------------------------------
61
62}; // namespace android
63
64#endif // ANDROID_AUDIO_TRACK_SHARED_H