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
28AudioRecordingLocal::AudioRecordingLocal(int hwId)
29    : mHwId(hwId),
30      mPcmHandle(NULL)
31{
32    LOGV("AudioRecordingLocal %x", (unsigned int)this);
33}
34
35AudioRecordingLocal::~AudioRecordingLocal()
36{
37    LOGV("~AudioRecordingLocal %x", (unsigned int)this);
38    releaseHw();
39}
40
41bool 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
71bool 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
92void AudioRecordingLocal::doStop()
93{
94    pcm_stop(mPcmHandle);
95}
96
97void AudioRecordingLocal::releaseHw()
98{
99    if (mPcmHandle != NULL) {
100        LOGV("releaseHw %x", (unsigned int)this);
101        doStop();
102        pcm_close(mPcmHandle);
103        mPcmHandle = NULL;
104    }
105}
106