1/*
2 * Copyright 2015 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#define LOG_TAG "AAudio"
18//#define LOG_NDEBUG 0
19#include <utils/Log.h>
20
21#include <new>
22#include <stdint.h>
23
24#include <aaudio/AAudio.h>
25#include <aaudio/AAudioTesting.h>
26
27#include "binding/AAudioBinderClient.h"
28#include "client/AudioStreamInternalCapture.h"
29#include "client/AudioStreamInternalPlay.h"
30#include "core/AudioStream.h"
31#include "core/AudioStreamBuilder.h"
32#include "legacy/AudioStreamRecord.h"
33#include "legacy/AudioStreamTrack.h"
34
35using namespace aaudio;
36
37#define AAUDIO_MMAP_POLICY_DEFAULT             AAUDIO_POLICY_NEVER
38#define AAUDIO_MMAP_EXCLUSIVE_POLICY_DEFAULT   AAUDIO_POLICY_NEVER
39
40/*
41 * AudioStreamBuilder
42 */
43AudioStreamBuilder::AudioStreamBuilder() {
44}
45
46AudioStreamBuilder::~AudioStreamBuilder() {
47}
48
49static aaudio_result_t builder_createStream(aaudio_direction_t direction,
50                                         aaudio_sharing_mode_t sharingMode,
51                                         bool tryMMap,
52                                         AudioStream **audioStreamPtr) {
53    *audioStreamPtr = nullptr;
54    aaudio_result_t result = AAUDIO_OK;
55
56    switch (direction) {
57
58        case AAUDIO_DIRECTION_INPUT:
59            if (tryMMap) {
60                *audioStreamPtr = new AudioStreamInternalCapture(AAudioBinderClient::getInstance(),
61                                                                 false);
62            } else {
63                *audioStreamPtr = new AudioStreamRecord();
64            }
65            break;
66
67        case AAUDIO_DIRECTION_OUTPUT:
68            if (tryMMap) {
69                *audioStreamPtr = new AudioStreamInternalPlay(AAudioBinderClient::getInstance(),
70                                                              false);
71            } else {
72                *audioStreamPtr = new AudioStreamTrack();
73            }
74            break;
75
76        default:
77            ALOGE("AudioStreamBuilder(): bad direction = %d", direction);
78            result = AAUDIO_ERROR_ILLEGAL_ARGUMENT;
79    }
80    return result;
81}
82
83// Try to open using MMAP path if that is allowed.
84// Fall back to Legacy path if MMAP not available.
85// Exact behavior is controlled by MMapPolicy.
86aaudio_result_t AudioStreamBuilder::build(AudioStream** streamPtr) {
87    AudioStream *audioStream = nullptr;
88    *streamPtr = nullptr;
89
90    // The API setting is the highest priority.
91    aaudio_policy_t mmapPolicy = AAudio_getMMapPolicy();
92    // If not specified then get from a system property.
93    if (mmapPolicy == AAUDIO_UNSPECIFIED) {
94        mmapPolicy = AAudioProperty_getMMapPolicy();
95    }
96    // If still not specified then use the default.
97    if (mmapPolicy == AAUDIO_UNSPECIFIED) {
98        mmapPolicy = AAUDIO_MMAP_POLICY_DEFAULT;
99    }
100
101    int32_t mapExclusivePolicy = AAudioProperty_getMMapExclusivePolicy();
102    if (mapExclusivePolicy == AAUDIO_UNSPECIFIED) {
103        mapExclusivePolicy = AAUDIO_MMAP_EXCLUSIVE_POLICY_DEFAULT;
104    }
105    ALOGD("AudioStreamBuilder(): mmapPolicy = %d, mapExclusivePolicy = %d",
106          mmapPolicy, mapExclusivePolicy);
107
108    aaudio_sharing_mode_t sharingMode = getSharingMode();
109    if ((sharingMode == AAUDIO_SHARING_MODE_EXCLUSIVE)
110        && (mapExclusivePolicy == AAUDIO_POLICY_NEVER)) {
111        ALOGW("AudioStreamBuilder(): EXCLUSIVE sharing mode not supported. Use SHARED.");
112        sharingMode = AAUDIO_SHARING_MODE_SHARED;
113        setSharingMode(sharingMode);
114    }
115
116    bool allowMMap = mmapPolicy != AAUDIO_POLICY_NEVER;
117    bool allowLegacy = mmapPolicy != AAUDIO_POLICY_ALWAYS;
118
119    aaudio_result_t result = builder_createStream(getDirection(), sharingMode,
120                                                  allowMMap, &audioStream);
121    if (result == AAUDIO_OK) {
122        // Open the stream using the parameters from the builder.
123        result = audioStream->open(*this);
124        if (result == AAUDIO_OK) {
125            *streamPtr = audioStream;
126        } else {
127            bool isMMap = audioStream->isMMap();
128            delete audioStream;
129            audioStream = nullptr;
130
131            if (isMMap && allowLegacy) {
132                ALOGD("AudioStreamBuilder.build() MMAP stream did not open so try Legacy path");
133                // If MMAP stream failed to open then TRY using a legacy stream.
134                result = builder_createStream(getDirection(), sharingMode,
135                                              false, &audioStream);
136                if (result == AAUDIO_OK) {
137                    result = audioStream->open(*this);
138                    if (result == AAUDIO_OK) {
139                        *streamPtr = audioStream;
140                    } else {
141                        delete audioStream;
142                    }
143                }
144            }
145        }
146    }
147
148    return result;
149}
150