| /* |
| * Copyright (C) 2014 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.internal.alsa; |
| |
| import android.util.Slog; |
| import java.io.BufferedReader; |
| import java.io.File; |
| import java.io.FileNotFoundException; |
| import java.io.FileReader; |
| import java.io.IOException; |
| import java.util.ArrayList; |
| |
| /** |
| * @hide Retrieves information from an ALSA "cards" file. |
| */ |
| public class AlsaCardsParser { |
| private static final String TAG = "AlsaCardsParser"; |
| protected static final boolean DEBUG = true; |
| |
| private static final String kCardsFilePath = "/proc/asound/cards"; |
| |
| private static LineTokenizer mTokenizer = new LineTokenizer(" :[]"); |
| |
| private ArrayList<AlsaCardRecord> mCardRecords = new ArrayList<AlsaCardRecord>(); |
| |
| public class AlsaCardRecord { |
| private static final String TAG = "AlsaCardRecord"; |
| private static final String kUsbCardKeyStr = "at usb-"; |
| |
| public int mCardNum = -1; |
| public String mField1 = ""; |
| public String mCardName = ""; |
| public String mCardDescription = ""; |
| public boolean mIsUsb = false; |
| |
| public AlsaCardRecord() {} |
| |
| public boolean parse(String line, int lineIndex) { |
| int tokenIndex = 0; |
| int delimIndex = 0; |
| |
| if (lineIndex == 0) { |
| // line # (skip) |
| tokenIndex = mTokenizer.nextToken(line, tokenIndex); |
| delimIndex = mTokenizer.nextDelimiter(line, tokenIndex); |
| |
| try { |
| // mCardNum |
| mCardNum = Integer.parseInt(line.substring(tokenIndex, delimIndex)); |
| } catch (NumberFormatException e) { |
| Slog.e(TAG, "Failed to parse line " + lineIndex + " of " + kCardsFilePath |
| + ": " + line.substring(tokenIndex, delimIndex)); |
| return false; |
| } |
| |
| // mField1 |
| tokenIndex = mTokenizer.nextToken(line, delimIndex); |
| delimIndex = mTokenizer.nextDelimiter(line, tokenIndex); |
| mField1 = line.substring(tokenIndex, delimIndex); |
| |
| // mCardName |
| tokenIndex = mTokenizer.nextToken(line, delimIndex); |
| mCardName = line.substring(tokenIndex); |
| |
| // done |
| } else if (lineIndex == 1) { |
| tokenIndex = mTokenizer.nextToken(line, 0); |
| if (tokenIndex != -1) { |
| int keyIndex = line.indexOf(kUsbCardKeyStr); |
| mIsUsb = keyIndex != -1; |
| if (mIsUsb) { |
| mCardDescription = line.substring(tokenIndex, keyIndex - 1); |
| } |
| } |
| } |
| |
| return true; |
| } |
| |
| public String textFormat() { |
| return mCardName + " : " + mCardDescription; |
| } |
| } |
| |
| public AlsaCardsParser() {} |
| |
| public void scan() { |
| if (DEBUG) { |
| Slog.i(TAG, "AlsaCardsParser.scan()"); |
| } |
| mCardRecords = new ArrayList<AlsaCardRecord>(); |
| |
| File cardsFile = new File(kCardsFilePath); |
| try { |
| FileReader reader = new FileReader(cardsFile); |
| BufferedReader bufferedReader = new BufferedReader(reader); |
| String line = ""; |
| while ((line = bufferedReader.readLine()) != null) { |
| AlsaCardRecord cardRecord = new AlsaCardRecord(); |
| if (DEBUG) { |
| Slog.i(TAG, " " + line); |
| } |
| cardRecord.parse(line, 0); |
| |
| line = bufferedReader.readLine(); |
| if (line == null) { |
| break; |
| } |
| if (DEBUG) { |
| Slog.i(TAG, " " + line); |
| } |
| cardRecord.parse(line, 1); |
| |
| mCardRecords.add(cardRecord); |
| } |
| reader.close(); |
| } catch (FileNotFoundException e) { |
| e.printStackTrace(); |
| } catch (IOException e) { |
| e.printStackTrace(); |
| } |
| } |
| |
| public ArrayList<AlsaCardRecord> getScanRecords() { |
| return mCardRecords; |
| } |
| |
| public AlsaCardRecord getCardRecordAt(int index) { |
| return mCardRecords.get(index); |
| } |
| |
| public AlsaCardRecord getCardRecordFor(int cardNum) { |
| for (AlsaCardRecord rec : mCardRecords) { |
| if (rec.mCardNum == cardNum) { |
| return rec; |
| } |
| } |
| |
| return null; |
| } |
| |
| public int getNumCardRecords() { |
| return mCardRecords.size(); |
| } |
| |
| public boolean isCardUsb(int cardNum) { |
| for (AlsaCardRecord rec : mCardRecords) { |
| if (rec.mCardNum == cardNum) { |
| return rec.mIsUsb; |
| } |
| } |
| |
| return false; |
| } |
| |
| // return -1 if none found |
| public int getDefaultUsbCard() { |
| // Choose the most-recently added EXTERNAL card |
| // or return the first added EXTERNAL card? |
| for (AlsaCardRecord rec : mCardRecords) { |
| if (rec.mIsUsb) { |
| return rec.mCardNum; |
| } |
| } |
| |
| return -1; |
| } |
| |
| public int getDefaultCard() { |
| // return an external card if possible |
| int card = getDefaultUsbCard(); |
| |
| if (card < 0 && getNumCardRecords() > 0) { |
| // otherwise return the (internal) card with the highest number |
| card = getCardRecordAt(getNumCardRecords() - 1).mCardNum; |
| } |
| return card; |
| } |
| |
| static public boolean hasCardNumber(ArrayList<AlsaCardRecord> recs, int cardNum) { |
| for (AlsaCardRecord cardRec : recs) { |
| if (cardRec.mCardNum == cardNum) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| public ArrayList<AlsaCardRecord> getNewCardRecords(ArrayList<AlsaCardRecord> prevScanRecs) { |
| ArrayList<AlsaCardRecord> newRecs = new ArrayList<AlsaCardRecord>(); |
| for (AlsaCardRecord rec : mCardRecords) { |
| // now scan to see if this card number is in the previous scan list |
| if (!hasCardNumber(prevScanRecs, rec.mCardNum)) { |
| newRecs.add(rec); |
| } |
| } |
| return newRecs; |
| } |
| |
| // |
| // Logging |
| // |
| public void Log(String heading) { |
| if (DEBUG) { |
| Slog.i(TAG, heading); |
| for (AlsaCardRecord cardRec : mCardRecords) { |
| Slog.i(TAG, cardRec.textFormat()); |
| } |
| } |
| } |
| } |