AudioSource.cpp revision e7c9cb48fec02697227bd847cd2e69432659adfd 
1/*
2 * Copyright (C) 2010 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#include <media/stagefright/AudioSource.h>
18
19#include <media/AudioRecord.h>
20#include <media/stagefright/MediaBufferGroup.h>
21#include <media/stagefright/MediaDebug.h>
22#include <media/stagefright/MediaDefs.h>
23#include <media/stagefright/MetaData.h>
24
25namespace android {
26
27AudioSource::AudioSource(
28        int inputSource, uint32_t sampleRate, uint32_t channels)
29    : mRecord(new AudioRecord(
30                inputSource, sampleRate, AudioSystem::PCM_16_BIT, channels)),
31      mInitCheck(mRecord->initCheck()),
32      mStarted(false),
33      mGroup(NULL) {
34}
35
36AudioSource::~AudioSource() {
37    if (mStarted) {
38        stop();
39    }
40
41    delete mRecord;
42    mRecord = NULL;
43}
44
45status_t AudioSource::initCheck() const {
46    return mInitCheck;
47}
48
49status_t AudioSource::start(MetaData *params) {
50    if (mStarted) {
51        return UNKNOWN_ERROR;
52    }
53
54    status_t err = mRecord->start();
55
56    if (err == OK) {
57        mGroup = new MediaBufferGroup;
58        mGroup->add_buffer(new MediaBuffer(kMaxBufferSize));
59
60        mStarted = true;
61    }
62
63    return err;
64}
65
66status_t AudioSource::stop() {
67    if (!mStarted) {
68        return UNKNOWN_ERROR;
69    }
70
71    mRecord->stop();
72
73    delete mGroup;
74    mGroup = NULL;
75
76    mStarted = false;
77
78    return OK;
79}
80
81sp<MetaData> AudioSource::getFormat() {
82    sp<MetaData> meta = new MetaData;
83    meta->setCString(kKeyMIMEType, MEDIA_MIMETYPE_AUDIO_RAW);
84    meta->setInt32(kKeySampleRate, mRecord->getSampleRate());
85    meta->setInt32(kKeyChannelCount, mRecord->channelCount());
86    meta->setInt32(kKeyMaxInputSize, kMaxBufferSize);
87
88    return meta;
89}
90
91status_t AudioSource::read(
92        MediaBuffer **out, const ReadOptions *options) {
93    *out = NULL;
94
95    MediaBuffer *buffer;
96    CHECK_EQ(mGroup->acquire_buffer(&buffer), OK);
97
98    uint32_t numFramesRecorded;
99    mRecord->getPosition(&numFramesRecorded);
100
101    buffer->meta_data()->setInt64(
102            kKeyTime,
103            (1000000ll * numFramesRecorded) / mRecord->getSampleRate()
104            - mRecord->latency() * 1000);
105
106    ssize_t n = mRecord->read(buffer->data(), buffer->size());
107
108    if (n < 0) {
109        buffer->release();
110        buffer = NULL;
111
112        return (status_t)n;
113    }
114
115    buffer->set_range(0, n);
116
117    *out = buffer;
118
119    return OK;
120}
121
122}  // namespace android
123