AudioParameter.cpp revision 3856b090cd04ba5dd4a59a12430ed724d5995909 
1/*
2 * Copyright (C) 2006-2011 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_TAG "AudioParameter"
18//#define LOG_NDEBUG 0
19
20#include <utils/Log.h>
21
22#include <media/AudioParameter.h>
23
24namespace android {
25
26const char *AudioParameter::keyRouting = "routing";
27const char *AudioParameter::keySamplingRate = "sampling_rate";
28const char *AudioParameter::keyFormat = "format";
29const char *AudioParameter::keyChannels = "channels";
30const char *AudioParameter::keyFrameCount = "frame_count";
31const char *AudioParameter::keyInputSource = "input_source";
32
33AudioParameter::AudioParameter(const String8& keyValuePairs)
34{
35    char *str = new char[keyValuePairs.length()+1];
36    mKeyValuePairs = keyValuePairs;
37
38    strcpy(str, keyValuePairs.string());
39    char *pair = strtok(str, ";");
40    while (pair != NULL) {
41        if (strlen(pair) != 0) {
42            size_t eqIdx = strcspn(pair, "=");
43            String8 key = String8(pair, eqIdx);
44            String8 value;
45            if (eqIdx == strlen(pair)) {
46                value = String8("");
47            } else {
48                value = String8(pair + eqIdx + 1);
49            }
50            if (mParameters.indexOfKey(key) < 0) {
51                mParameters.add(key, value);
52            } else {
53                mParameters.replaceValueFor(key, value);
54            }
55        } else {
56            ALOGV("AudioParameter() cstor empty key value pair");
57        }
58        pair = strtok(NULL, ";");
59    }
60
61    delete[] str;
62}
63
64AudioParameter::~AudioParameter()
65{
66    mParameters.clear();
67}
68
69String8 AudioParameter::toString()
70{
71    String8 str = String8("");
72
73    size_t size = mParameters.size();
74    for (size_t i = 0; i < size; i++) {
75        str += mParameters.keyAt(i);
76        str += "=";
77        str += mParameters.valueAt(i);
78        if (i < (size - 1)) str += ";";
79    }
80    return str;
81}
82
83status_t AudioParameter::add(const String8& key, const String8& value)
84{
85    if (mParameters.indexOfKey(key) < 0) {
86        mParameters.add(key, value);
87        return NO_ERROR;
88    } else {
89        mParameters.replaceValueFor(key, value);
90        return ALREADY_EXISTS;
91    }
92}
93
94status_t AudioParameter::addInt(const String8& key, const int value)
95{
96    char str[12];
97    if (snprintf(str, 12, "%d", value) > 0) {
98        String8 str8 = String8(str);
99        return add(key, str8);
100    } else {
101        return BAD_VALUE;
102    }
103}
104
105status_t AudioParameter::addFloat(const String8& key, const float value)
106{
107    char str[23];
108    if (snprintf(str, 23, "%.10f", value) > 0) {
109        String8 str8 = String8(str);
110        return add(key, str8);
111    } else {
112        return BAD_VALUE;
113    }
114}
115
116status_t AudioParameter::remove(const String8& key)
117{
118    if (mParameters.indexOfKey(key) >= 0) {
119        mParameters.removeItem(key);
120        return NO_ERROR;
121    } else {
122        return BAD_VALUE;
123    }
124}
125
126status_t AudioParameter::get(const String8& key, String8& value)
127{
128    if (mParameters.indexOfKey(key) >= 0) {
129        value = mParameters.valueFor(key);
130        return NO_ERROR;
131    } else {
132        return BAD_VALUE;
133    }
134}
135
136status_t AudioParameter::getInt(const String8& key, int& value)
137{
138    String8 str8;
139    status_t result = get(key, str8);
140    value = 0;
141    if (result == NO_ERROR) {
142        int val;
143        if (sscanf(str8.string(), "%d", &val) == 1) {
144            value = val;
145        } else {
146            result = INVALID_OPERATION;
147        }
148    }
149    return result;
150}
151
152status_t AudioParameter::getFloat(const String8& key, float& value)
153{
154    String8 str8;
155    status_t result = get(key, str8);
156    value = 0;
157    if (result == NO_ERROR) {
158        float val;
159        if (sscanf(str8.string(), "%f", &val) == 1) {
160            value = val;
161        } else {
162            result = INVALID_OPERATION;
163        }
164    }
165    return result;
166}
167
168status_t AudioParameter::getAt(size_t index, String8& key, String8& value)
169{
170    if (mParameters.size() > index) {
171        key = mParameters.keyAt(index);
172        value = mParameters.valueAt(index);
173        return NO_ERROR;
174    } else {
175        return BAD_VALUE;
176    }
177}
178
179};  // namespace android
180