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/*
* Copyright (C) 2015 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.tv.tuner.tvinput;
import android.util.Log;
import android.util.SparseArray;
import android.util.SparseBooleanArray;
import com.android.tv.tuner.data.PsiData.PatItem;
import com.android.tv.tuner.data.PsiData.PmtItem;
import com.android.tv.tuner.data.PsipData.EitItem;
import com.android.tv.tuner.data.PsipData.SdtItem;
import com.android.tv.tuner.data.PsipData.VctItem;
import com.android.tv.tuner.data.TunerChannel;
import com.android.tv.tuner.data.nano.Track.AtscAudioTrack;
import com.android.tv.tuner.data.nano.Track.AtscCaptionTrack;
import com.android.tv.tuner.source.FileTsStreamer;
import com.android.tv.tuner.ts.TsParser;
import com.android.tv.tuner.tvinput.EventDetector.EventListener;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
/**
* PSIP event detector for a file source.
*
* <p>Uses {@link TsParser} to analyze input MPEG-2 transport stream, detects and reports
* various PSIP-related events via {@link TsParser.TsOutputListener}.
*/
public class FileSourceEventDetector {
private static final String TAG = "FileSourceEventDetector";
private static final boolean DEBUG = true;
public static final int ALL_PROGRAM_NUMBERS = 0;
private TsParser mTsParser;
private final Set<Integer> mVctProgramNumberSet = new HashSet<>();
private final Set<Integer> mSdtProgramNumberSet = new HashSet<>();
private final SparseArray<TunerChannel> mChannelMap = new SparseArray<>();
private final SparseBooleanArray mVctCaptionTracksFound = new SparseBooleanArray();
private final SparseBooleanArray mEitCaptionTracksFound = new SparseBooleanArray();
private final EventListener mEventListener;
private final boolean mEnableDvbSignal;
private FileTsStreamer.StreamProvider mStreamProvider;
private int mProgramNumber = ALL_PROGRAM_NUMBERS;
public FileSourceEventDetector(EventDetector.EventListener listener, boolean enableDvbSignal) {
mEventListener = listener;
mEnableDvbSignal = enableDvbSignal;
}
/**
* Starts detecting channel and program information.
*
* @param provider MPEG-2 transport stream source.
* @param programNumber The program number if this is for handling tune request. For scanning
* purpose, supply {@link #ALL_PROGRAM_NUMBERS}.
*/
public void start(FileTsStreamer.StreamProvider provider, int programNumber) {
mStreamProvider = provider;
mProgramNumber = programNumber;
reset();
}
private void reset() {
mTsParser = new TsParser(mTsOutputListener, mEnableDvbSignal); // TODO: Use TsParser.reset()
mStreamProvider.clearPidFilter();
mVctProgramNumberSet.clear();
mSdtProgramNumberSet.clear();
mVctCaptionTracksFound.clear();
mEitCaptionTracksFound.clear();
mChannelMap.clear();
}
public void feedTSStream(byte[] data, int startOffset, int length) {
if (mStreamProvider.isFilterEmpty()) {
startListening(TsParser.ATSC_SI_BASE_PID);
startListening(TsParser.PAT_PID);
}
if (mTsParser != null) {
mTsParser.feedTSData(data, startOffset, length);
}
}
private void startListening(int pid) {
if (mStreamProvider.isInFilter(pid)) {
return;
}
mStreamProvider.addPidFilter(pid);
}
private final TsParser.TsOutputListener mTsOutputListener = new TsParser.TsOutputListener() {
@Override
public void onPatDetected(List<PatItem> items) {
for (PatItem i : items) {
if (mProgramNumber == ALL_PROGRAM_NUMBERS || mProgramNumber == i.getProgramNo()) {
mStreamProvider.addPidFilter(i.getPmtPid());
}
}
}
@Override
public void onEitPidDetected(int pid) {
startListening(pid);
}
@Override
public void onEitItemParsed(VctItem channel, List<EitItem> items) {
TunerChannel tunerChannel = mChannelMap.get(channel.getProgramNumber());
if (DEBUG) {
Log.d(TAG, "onEitItemParsed tunerChannel:" + tunerChannel + " "
+ channel.getProgramNumber());
}
int channelSourceId = channel.getSourceId();
// Source id 0 is useful for cases where a cable operator wishes to define a channel for
// which no EPG data is currently available.
// We don't handle such a case.
if (channelSourceId == 0) {
return;
}
// If at least a one caption track have been found in EIT items for the given channel,
// we starts to interpret the zero tracks as a clearance of the caption tracks.
boolean captionTracksFound = mEitCaptionTracksFound.get(channelSourceId);
for (EitItem item : items) {
if (captionTracksFound) {
break;
}
List<AtscCaptionTrack> captionTracks = item.getCaptionTracks();
if (captionTracks != null && !captionTracks.isEmpty()) {
captionTracksFound = true;
}
}
mEitCaptionTracksFound.put(channelSourceId, captionTracksFound);
if (captionTracksFound) {
for (EitItem item : items) {
item.setHasCaptionTrack();
}
}
if (tunerChannel != null && mEventListener != null) {
mEventListener.onEventDetected(tunerChannel, items);
}
}
@Override
public void onEttPidDetected(int pid) {
startListening(pid);
}
@Override
public void onAllVctItemsParsed() {
// do nothing.
}
@Override
public void onVctItemParsed(VctItem channel, List<PmtItem> pmtItems) {
if (DEBUG) {
Log.d(TAG, "onVctItemParsed VCT " + channel);
Log.d(TAG, " PMT " + pmtItems);
}
// Merges the audio and caption tracks located in PMT items into the tracks of the given
// tuner channel.
TunerChannel tunerChannel = TunerChannel.forFile(channel, pmtItems);
List<AtscAudioTrack> audioTracks = new ArrayList<>();
List<AtscCaptionTrack> captionTracks = new ArrayList<>();
for (PmtItem pmtItem : pmtItems) {
if (pmtItem.getAudioTracks() != null) {
audioTracks.addAll(pmtItem.getAudioTracks());
}
if (pmtItem.getCaptionTracks() != null) {
captionTracks.addAll(pmtItem.getCaptionTracks());
}
}
int channelProgramNumber = channel.getProgramNumber();
// If at least a one caption track have been found in VCT items for the given channel,
// we starts to interpret the zero tracks as a clearance of the caption tracks.
boolean captionTracksFound = mVctCaptionTracksFound.get(channelProgramNumber)
|| !captionTracks.isEmpty();
mVctCaptionTracksFound.put(channelProgramNumber, captionTracksFound);
if (captionTracksFound) {
tunerChannel.setHasCaptionTrack();
}
tunerChannel.setFilepath(mStreamProvider.getFilepath());
tunerChannel.setAudioTracks(audioTracks);
tunerChannel.setCaptionTracks(captionTracks);
mChannelMap.put(tunerChannel.getProgramNumber(), tunerChannel);
boolean found = mVctProgramNumberSet.contains(channelProgramNumber);
if (!found) {
mVctProgramNumberSet.add(channelProgramNumber);
}
if (mEventListener != null) {
mEventListener.onChannelDetected(tunerChannel, !found);
}
}
@Override
public void onSdtItemParsed(SdtItem channel, List<PmtItem> pmtItems) {
if (DEBUG) {
Log.d(TAG, "onSdtItemParsed SDT " + channel);
Log.d(TAG, " PMT " + pmtItems);
}
// Merges the audio and caption tracks located in PMT items into the tracks of the given
// tuner channel.
TunerChannel tunerChannel = TunerChannel.forDvbFile(channel, pmtItems);
List<AtscAudioTrack> audioTracks = new ArrayList<>();
List<AtscCaptionTrack> captionTracks = new ArrayList<>();
for (PmtItem pmtItem : pmtItems) {
if (pmtItem.getAudioTracks() != null) {
audioTracks.addAll(pmtItem.getAudioTracks());
}
if (pmtItem.getCaptionTracks() != null) {
captionTracks.addAll(pmtItem.getCaptionTracks());
}
}
int channelProgramNumber = channel.getServiceId();
tunerChannel.setFilepath(mStreamProvider.getFilepath());
tunerChannel.setAudioTracks(audioTracks);
tunerChannel.setCaptionTracks(captionTracks);
mChannelMap.put(tunerChannel.getProgramNumber(), tunerChannel);
boolean found = mSdtProgramNumberSet.contains(channelProgramNumber);
if (!found) {
mSdtProgramNumberSet.add(channelProgramNumber);
}
if (mEventListener != null) {
mEventListener.onChannelDetected(tunerChannel, !found);
}
}
};
}
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