PlaylistFetcher.h revision b44ce2f84691559672cfaf6bb8fd3a9ac43904f2
1324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver/* 2324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * Copyright (C) 2012 The Android Open Source Project 3324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * 4324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * Licensed under the Apache License, Version 2.0 (the "License"); 5324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * you may not use this file except in compliance with the License. 6324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * You may obtain a copy of the License at 7324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * 8324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * http://www.apache.org/licenses/LICENSE-2.0 9324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * 10324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * Unless required by applicable law or agreed to in writing, software 11324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * distributed under the License is distributed on an "AS IS" BASIS, 12324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * See the License for the specific language governing permissions and 14324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver * limitations under the License. 15324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver */ 16324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 17324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver#ifndef PLAYLIST_FETCHER_H_ 18324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 19324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver#define PLAYLIST_FETCHER_H_ 20324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 21324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver#include <media/stagefright/foundation/AHandler.h> 22324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 23324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver#include "mpeg2ts/ATSParser.h" 24324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver#include "LiveSession.h" 25324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 26324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruvernamespace android { 27324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 28324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruverstruct ABuffer; 29324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruverstruct AnotherPacketSource; 30324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruverstruct DataSource; 31324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruverstruct HTTPBase; 32324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruverstruct LiveDataSource; 33324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruverstruct M3UParser; 34324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruverstruct String8; 35324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 36324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruverstruct PlaylistFetcher : public AHandler { 37324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver enum { 38324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver kWhatStarted, 39324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver kWhatPaused, 40324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver kWhatStopped, 41324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver kWhatError, 42324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver kWhatDurationUpdate, 43324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver kWhatTemporarilyDoneFetching, 44324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver kWhatPrepared, 45324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver kWhatPreparationFailed, 46324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver kWhatStartedAt, 47324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver }; 48324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 49324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver PlaylistFetcher( 50324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver const sp<AMessage> ¬ify, 51324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver const sp<LiveSession> &session, 52324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver const char *uri, 53324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver int32_t subtitleGeneration); 54324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 55324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver sp<DataSource> getDataSource(); 56324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 57324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver void startAsync( 58324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver const sp<AnotherPacketSource> &audioSource, 59324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver const sp<AnotherPacketSource> &videoSource, 60324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver const sp<AnotherPacketSource> &subtitleSource, 61324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver int64_t startTimeUs = -1ll, // starting timestamps 62324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver int64_t segmentStartTimeUs = -1ll, // starting position within playlist 63324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver // startTimeUs!=segmentStartTimeUs only when playlist is live 64324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver int32_t startDiscontinuitySeq = 0, 65324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver bool adaptive = false); 66324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 67324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver void pauseAsync(); 68324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 69324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver void stopAsync(bool clear = true); 70324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 71324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver void resumeUntilAsync(const sp<AMessage> ¶ms); 72324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 73324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver uint32_t getStreamTypeMask() const { 74324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver return mStreamTypeMask; 75324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 76324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 77324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruverprotected: 78324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver virtual ~PlaylistFetcher(); 79324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver virtual void onMessageReceived(const sp<AMessage> &msg); 80324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 81324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruverprivate: 82324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver enum { 83324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver kMaxNumRetries = 5, 84324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver }; 85324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 86324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver enum { 87324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver kWhatStart = 'strt', 88324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver kWhatPause = 'paus', 89324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver kWhatStop = 'stop', 90324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver kWhatMonitorQueue = 'moni', 91324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver kWhatResumeUntil = 'rsme', 92324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver kWhatDownloadNext = 'dlnx', 93324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver }; 94324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 95324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver static const int64_t kMinBufferedDurationUs; 96324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver static const int64_t kMaxMonitorDelayUs; 97324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver static const int32_t kDownloadBlockSize; 98324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver static const int32_t kNumSkipFrames; 99324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 100324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver static bool bufferStartsWithTsSyncByte(const sp<ABuffer>& buffer); 101324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver static bool bufferStartsWithWebVTTMagicSequence(const sp<ABuffer>& buffer); 102324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 103324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver // notifications to mSession 104324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver sp<AMessage> mNotify; 105324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver sp<AMessage> mStartTimeUsNotify; 106324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 107324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver sp<LiveSession> mSession; 108324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver AString mURI; 109324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 110324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver uint32_t mStreamTypeMask; 111324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver int64_t mStartTimeUs; 112324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 113324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver // Start time relative to the beginning of the first segment in the initial 114324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver // playlist. It's value is initialized to a non-negative value only when we are 115324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver // adapting or switching tracks. 116324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver int64_t mSegmentStartTimeUs; 117324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 118324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver ssize_t mDiscontinuitySeq; 119324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver bool mStartTimeUsRelative; 120324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver sp<AMessage> mStopParams; // message containing the latest timestamps we should fetch. 121324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 122324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver KeyedVector<LiveSession::StreamType, sp<AnotherPacketSource> > 123324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver mPacketSources; 124324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 125324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver KeyedVector<AString, sp<ABuffer> > mAESKeyForURI; 126324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 127324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver int64_t mLastPlaylistFetchTimeUs; 128324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver sp<M3UParser> mPlaylist; 129 int32_t mSeqNumber; 130 int32_t mNumRetries; 131 bool mStartup; 132 bool mAdaptive; 133 bool mPrepared; 134 int64_t mNextPTSTimeUs; 135 136 int32_t mMonitorQueueGeneration; 137 const int32_t mSubtitleGeneration; 138 139 enum RefreshState { 140 INITIAL_MINIMUM_RELOAD_DELAY, 141 FIRST_UNCHANGED_RELOAD_ATTEMPT, 142 SECOND_UNCHANGED_RELOAD_ATTEMPT, 143 THIRD_UNCHANGED_RELOAD_ATTEMPT 144 }; 145 RefreshState mRefreshState; 146 147 uint8_t mPlaylistHash[16]; 148 149 sp<ATSParser> mTSParser; 150 151 bool mFirstPTSValid; 152 uint64_t mFirstPTS; 153 int64_t mFirstTimeUs; 154 int64_t mAbsoluteTimeAnchorUs; 155 sp<AnotherPacketSource> mVideoBuffer; 156 157 // Stores the initialization vector to decrypt the next block of cipher text, which can 158 // either be derived from the sequence number, read from the manifest, or copied from 159 // the last block of cipher text (cipher-block chaining). 160 unsigned char mAESInitVec[16]; 161 162 // Set first to true if decrypting the first segment of a playlist segment. When 163 // first is true, reset the initialization vector based on the available 164 // information in the manifest; otherwise, use the initialization vector as 165 // updated by the last call to AES_cbc_encrypt. 166 // 167 // For the input to decrypt correctly, decryptBuffer must be called on 168 // consecutive byte ranges on block boundaries, e.g. 0..15, 16..47, 48..63, 169 // and so on. 170 status_t decryptBuffer( 171 size_t playlistIndex, const sp<ABuffer> &buffer, 172 bool first = true); 173 status_t checkDecryptPadding(const sp<ABuffer> &buffer); 174 175 void postMonitorQueue(int64_t delayUs = 0, int64_t minDelayUs = 0); 176 void cancelMonitorQueue(); 177 178 int64_t delayUsToRefreshPlaylist() const; 179 status_t refreshPlaylist(); 180 181 // Returns the media time in us of the segment specified by seqNumber. 182 // This is computed by summing the durations of all segments before it. 183 int64_t getSegmentStartTimeUs(int32_t seqNumber) const; 184 185 status_t onStart(const sp<AMessage> &msg); 186 void onPause(); 187 void onStop(const sp<AMessage> &msg); 188 void onMonitorQueue(); 189 void onDownloadNext(); 190 191 // Resume a fetcher to continue until the stopping point stored in msg. 192 status_t onResumeUntil(const sp<AMessage> &msg); 193 194 const sp<ABuffer> &setAccessUnitProperties( 195 const sp<ABuffer> &accessUnit, 196 const sp<AnotherPacketSource> &source, 197 bool discard = false); 198 status_t extractAndQueueAccessUnitsFromTs(const sp<ABuffer> &buffer); 199 200 status_t extractAndQueueAccessUnits( 201 const sp<ABuffer> &buffer, const sp<AMessage> &itemMeta); 202 203 void notifyError(status_t err); 204 205 void queueDiscontinuity( 206 ATSParser::DiscontinuityType type, const sp<AMessage> &extra); 207 208 int32_t getSeqNumberWithAnchorTime(int64_t anchorTimeUs) const; 209 int32_t getSeqNumberForDiscontinuity(size_t discontinuitySeq) const; 210 int32_t getSeqNumberForTime(int64_t timeUs) const; 211 212 void updateDuration(); 213 214 // Before resuming a fetcher in onResume, check the remaining duration is longer than that 215 // returned by resumeThreshold. 216 int64_t resumeThreshold(const sp<AMessage> &msg); 217 218 DISALLOW_EVIL_CONSTRUCTORS(PlaylistFetcher); 219}; 220 221} // namespace android 222 223#endif // PLAYLIST_FETCHER_H_ 224 225