1 /*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
5 * use this file except in compliance with the License. You may obtain a copy of
6 * 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, WITHOUT
12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13 * License for the specific language governing permissions and limitations under
14 * the License.
15 */
16
17 #include <stdint.h>
18 #include <string.h>
19 #include <tinyalsa/asoundlib.h>
20
21 #include "audio/AudioHardware.h"
22 #include "audio/Buffer.h"
23 #include "Log.h"
24
25 #include "audio/AudioRecordingLocal.h"
26
27
AudioRecordingLocal(int hwId)28 AudioRecordingLocal::AudioRecordingLocal(int hwId)
29 : mHwId(hwId),
30 mPcmHandle(NULL)
31 {
32 LOGV("AudioRecordingLocal %x", (unsigned long)this);
33 }
34
~AudioRecordingLocal()35 AudioRecordingLocal::~AudioRecordingLocal()
36 {
37 LOGV("~AudioRecordingLocal %x", (unsigned long)this);
38 releaseHw();
39 }
40
doPrepare(AudioHardware::SamplingRate samplingRate,int samplesInOneGo)41 bool AudioRecordingLocal::doPrepare(AudioHardware::SamplingRate samplingRate, int samplesInOneGo)
42 {
43 releaseHw();
44
45 struct pcm_config config;
46
47 memset(&config, 0, sizeof(config));
48 config.channels = 2;
49 config.rate = samplingRate;
50 config.period_size = 1024;
51 config.period_count = 32;
52 config.format = PCM_FORMAT_S16_LE;
53 config.start_threshold = 0;
54 config.stop_threshold = 0;
55 config.silence_threshold = 0;
56
57 mPcmHandle = pcm_open(mHwId, 0, PCM_IN, &config);
58 if (!mPcmHandle || !pcm_is_ready(mPcmHandle)) {
59 LOGE("Unable to open PCM device(%d) (%s)\n", mHwId, pcm_get_error(mPcmHandle));
60 return false;
61 }
62
63 mSamples = samplesInOneGo;
64 mSizes = samplesInOneGo * 4; // stereo, 16bit
65
66 mBufferSize = pcm_get_buffer_size(mPcmHandle);
67 LOGD("buffer size %d, read size %d", mBufferSize, mSizes);
68 return true;
69 }
70
doPlaybackOrRecord(android::sp<Buffer> & buffer)71 bool AudioRecordingLocal::doPlaybackOrRecord(android::sp<Buffer>& buffer)
72 {
73 int toRead = mSizes;
74 if (buffer->amountToHandle() < (size_t)mSizes) {
75 toRead = buffer->amountToHandle();
76 }
77 LOGD("recording will read %d", toRead);
78
79 while (toRead > 0) {
80 int readSize = (toRead > mBufferSize) ? mBufferSize : toRead;
81 if (pcm_read(mPcmHandle, buffer->getUnhanledData(), readSize)) {
82 LOGE("AudioRecordingLocal error %s", pcm_get_error(mPcmHandle));
83 return false;
84 }
85 buffer->increaseHandled(readSize);
86 toRead -= readSize;
87 }
88 LOGV("AudioRecordingLocal::doPlaybackOrRecord %d", buffer->amountHandled());
89 return true;
90 }
91
doStop()92 void AudioRecordingLocal::doStop()
93 {
94 pcm_stop(mPcmHandle);
95 }
96
releaseHw()97 void AudioRecordingLocal::releaseHw()
98 {
99 if (mPcmHandle != NULL) {
100 LOGV("releaseHw %x", (unsigned long)this);
101 doStop();
102 pcm_close(mPcmHandle);
103 mPcmHandle = NULL;
104 }
105 }
106