AudioSource.cpp revision 050b28a593350047845a45a14cc5026221ac1620
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 29namespace android { 30 31AudioSource::AudioSource( 32 int inputSource, uint32_t sampleRate, uint32_t channels) 33 : mRecord(new AudioRecord( 34 inputSource, sampleRate, AudioSystem::PCM_16_BIT, channels)), 35 mInitCheck(mRecord->initCheck()), 36 mStarted(false), 37 mGroup(NULL) { 38} 39 40AudioSource::~AudioSource() { 41 if (mStarted) { 42 stop(); 43 } 44 45 delete mRecord; 46 mRecord = NULL; 47} 48 49status_t AudioSource::initCheck() const { 50 return mInitCheck; 51} 52 53status_t AudioSource::start(MetaData *params) { 54 if (mStarted) { 55 return UNKNOWN_ERROR; 56 } 57 58 status_t err = mRecord->start(); 59 60 if (err == OK) { 61 mGroup = new MediaBufferGroup; 62 mGroup->add_buffer(new MediaBuffer(kMaxBufferSize)); 63 64 mStarted = true; 65 } 66 67 return err; 68} 69 70status_t AudioSource::stop() { 71 if (!mStarted) { 72 return UNKNOWN_ERROR; 73 } 74 75 mRecord->stop(); 76 77 delete mGroup; 78 mGroup = NULL; 79 80 mStarted = false; 81 82 return OK; 83} 84 85sp<MetaData> AudioSource::getFormat() { 86 sp<MetaData> meta = new MetaData; 87 meta->setCString(kKeyMIMEType, MEDIA_MIMETYPE_AUDIO_RAW); 88 meta->setInt32(kKeySampleRate, mRecord->getSampleRate()); 89 meta->setInt32(kKeyChannelCount, mRecord->channelCount()); 90 meta->setInt32(kKeyMaxInputSize, kMaxBufferSize); 91 92 return meta; 93} 94 95status_t AudioSource::read( 96 MediaBuffer **out, const ReadOptions *options) { 97 *out = NULL; 98 99 MediaBuffer *buffer; 100 CHECK_EQ(mGroup->acquire_buffer(&buffer), OK); 101 102 uint32_t numFramesRecorded; 103 mRecord->getPosition(&numFramesRecorded); 104 105 buffer->meta_data()->setInt64( 106 kKeyTime, 107 (1000000ll * numFramesRecorded) / mRecord->getSampleRate() 108 - mRecord->latency() * 1000); 109 110 ssize_t n = mRecord->read(buffer->data(), buffer->size()); 111 112 if (n < 0) { 113 buffer->release(); 114 buffer = NULL; 115 116 return (status_t)n; 117 } 118 119 buffer->set_range(0, n); 120 121 *out = buffer; 122 123 return OK; 124} 125 126} // namespace android 127