AudioSource.cpp revision a7d1a2dd776bf356c228785a94ba8e0ff6a2ec7f 
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//#define LOG_NDEBUG 0
18#define LOG_TAG "AudioSource"
19#include <utils/Log.h>
20
21#include <media/stagefright/AudioSource.h>
22
23#include <media/AudioRecord.h>
24#include <media/stagefright/MediaBufferGroup.h>
25#include <media/stagefright/MediaDebug.h>
26#include <media/stagefright/MediaDefs.h>
27#include <media/stagefright/MetaData.h>
28#include <cutils/properties.h>
29#include <sys/time.h>
30#include <time.h>
31
32namespace android {
33
34AudioSource::AudioSource(
35        int inputSource, uint32_t sampleRate, uint32_t channels)
36    : mRecord(new AudioRecord(
37                inputSource, sampleRate, AudioSystem::PCM_16_BIT, channels)),
38      mInitCheck(mRecord->initCheck()),
39      mStarted(false),
40      mCollectStats(false),
41      mTotalReadTimeUs(0),
42      mTotalReadBytes(0),
43      mTotalReads(0),
44      mGroup(NULL) {
45}
46
47AudioSource::~AudioSource() {
48    if (mStarted) {
49        stop();
50    }
51
52    delete mRecord;
53    mRecord = NULL;
54}
55
56status_t AudioSource::initCheck() const {
57    return mInitCheck;
58}
59
60status_t AudioSource::start(MetaData *params) {
61    if (mStarted) {
62        return UNKNOWN_ERROR;
63    }
64
65    char value[PROPERTY_VALUE_MAX];
66    if (property_get("media.stagefright.record-stats", value, NULL)
67        && (!strcmp(value, "1") || !strcasecmp(value, "true"))) {
68        mCollectStats = true;
69    }
70    status_t err = mRecord->start();
71
72    if (err == OK) {
73        mGroup = new MediaBufferGroup;
74        mGroup->add_buffer(new MediaBuffer(kMaxBufferSize));
75
76        mStarted = true;
77    }
78
79    return err;
80}
81
82status_t AudioSource::stop() {
83    if (!mStarted) {
84        return UNKNOWN_ERROR;
85    }
86
87    mRecord->stop();
88
89    delete mGroup;
90    mGroup = NULL;
91
92    mStarted = false;
93
94    if (mCollectStats) {
95        LOGI("%lld reads: %.2f bps in %lld us",
96                mTotalReads,
97                (mTotalReadBytes * 8000000.0) / mTotalReadTimeUs,
98                mTotalReadTimeUs);
99    }
100
101    return OK;
102}
103
104sp<MetaData> AudioSource::getFormat() {
105    sp<MetaData> meta = new MetaData;
106    meta->setCString(kKeyMIMEType, MEDIA_MIMETYPE_AUDIO_RAW);
107    meta->setInt32(kKeySampleRate, mRecord->getSampleRate());
108    meta->setInt32(kKeyChannelCount, mRecord->channelCount());
109    meta->setInt32(kKeyMaxInputSize, kMaxBufferSize);
110
111    return meta;
112}
113
114status_t AudioSource::read(
115        MediaBuffer **out, const ReadOptions *options) {
116    *out = NULL;
117    ++mTotalReads;
118
119    MediaBuffer *buffer;
120    CHECK_EQ(mGroup->acquire_buffer(&buffer), OK);
121
122    uint32_t numFramesRecorded;
123    mRecord->getPosition(&numFramesRecorded);
124    int64_t latency = mRecord->latency() * 1000;
125    uint32_t sampleRate = mRecord->getSampleRate();
126    int64_t timestampUs = (1000000LL * numFramesRecorded) / sampleRate - latency;
127    LOGV("latency: %lld, sample rate: %d, timestamp: %lld",
128            latency, sampleRate, timestampUs);
129
130    buffer->meta_data()->setInt64(kKeyTime, timestampUs);
131
132    ssize_t n = 0;
133    if (mCollectStats) {
134        struct timeval tv_start, tv_end;
135        gettimeofday(&tv_start, NULL);
136        n = mRecord->read(buffer->data(), buffer->size());
137        gettimeofday(&tv_end, NULL);
138        mTotalReadTimeUs += ((1000000LL * (tv_end.tv_sec - tv_start.tv_sec))
139                + (tv_end.tv_usec - tv_start.tv_usec));
140        if (n >= 0) {
141            mTotalReadBytes += n;
142        }
143    } else {
144        n = mRecord->read(buffer->data(), buffer->size());
145    }
146
147    if (n < 0) {
148        buffer->release();
149        buffer = NULL;
150
151        return (status_t)n;
152    }
153
154    buffer->set_range(0, n);
155
156    *out = buffer;
157
158    return OK;
159}
160
161}  // namespace android
162