LiveSession.h revision 404fced9bfa8fa423ee210a271ca051ffd1bec13
1/* 2 * Copyright (C) 2010 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#ifndef LIVE_SESSION_H_ 18 19#define LIVE_SESSION_H_ 20 21#include <media/stagefright/foundation/AHandler.h> 22 23#include <utils/String8.h> 24 25namespace android { 26 27struct ABuffer; 28struct AnotherPacketSource; 29struct DataSource; 30struct HTTPBase; 31struct IMediaHTTPService; 32struct LiveDataSource; 33struct M3UParser; 34struct PlaylistFetcher; 35struct Parcel; 36 37struct LiveSession : public AHandler { 38 enum Flags { 39 // Don't log any URLs. 40 kFlagIncognito = 1, 41 }; 42 LiveSession( 43 const sp<AMessage> ¬ify, 44 uint32_t flags, 45 const sp<IMediaHTTPService> &httpService); 46 47 enum StreamIndex { 48 kAudioIndex = 0, 49 kVideoIndex = 1, 50 kSubtitleIndex = 2, 51 kMaxStreams = 3, 52 }; 53 54 enum StreamType { 55 STREAMTYPE_AUDIO = 1 << kAudioIndex, 56 STREAMTYPE_VIDEO = 1 << kVideoIndex, 57 STREAMTYPE_SUBTITLES = 1 << kSubtitleIndex, 58 }; 59 status_t dequeueAccessUnit(StreamType stream, sp<ABuffer> *accessUnit); 60 61 status_t getStreamFormat(StreamType stream, sp<AMessage> *format); 62 63 void connectAsync( 64 const char *url, 65 const KeyedVector<String8, String8> *headers = NULL); 66 67 status_t disconnect(); 68 69 // Blocks until seek is complete. 70 status_t seekTo(int64_t timeUs); 71 72 status_t getDuration(int64_t *durationUs) const; 73 size_t getTrackCount() const; 74 sp<AMessage> getTrackInfo(size_t trackIndex) const; 75 status_t selectTrack(size_t index, bool select); 76 77 bool isSeekable() const; 78 bool hasDynamicDuration() const; 79 80 enum { 81 kWhatStreamsChanged, 82 kWhatError, 83 kWhatPrepared, 84 kWhatPreparationFailed, 85 }; 86 87 // create a format-change discontinuity 88 // 89 // swap: 90 // whether is format-change discontinuity should trigger a buffer swap 91 sp<ABuffer> createFormatChangeBuffer(bool swap = true); 92protected: 93 virtual ~LiveSession(); 94 95 virtual void onMessageReceived(const sp<AMessage> &msg); 96 97private: 98 friend struct PlaylistFetcher; 99 100 enum { 101 kWhatConnect = 'conn', 102 kWhatDisconnect = 'disc', 103 kWhatSeek = 'seek', 104 kWhatFetcherNotify = 'notf', 105 kWhatCheckBandwidth = 'bndw', 106 kWhatChangeConfiguration = 'chC0', 107 kWhatChangeConfiguration2 = 'chC2', 108 kWhatChangeConfiguration3 = 'chC3', 109 kWhatFinishDisconnect2 = 'fin2', 110 kWhatSwapped = 'swap', 111 }; 112 113 struct BandwidthItem { 114 size_t mPlaylistIndex; 115 unsigned long mBandwidth; 116 }; 117 118 struct FetcherInfo { 119 sp<PlaylistFetcher> mFetcher; 120 int64_t mDurationUs; 121 bool mIsPrepared; 122 bool mToBeRemoved; 123 }; 124 125 struct StreamItem { 126 const char *mType; 127 AString mUri; 128 StreamItem() : mType("") {} 129 StreamItem(const char *type) : mType(type) {} 130 AString uriKey() { 131 AString key(mType); 132 key.append("URI"); 133 return key; 134 } 135 }; 136 StreamItem mStreams[kMaxStreams]; 137 138 sp<AMessage> mNotify; 139 uint32_t mFlags; 140 sp<IMediaHTTPService> mHTTPService; 141 142 bool mInPreparationPhase; 143 144 sp<HTTPBase> mHTTPDataSource; 145 KeyedVector<String8, String8> mExtraHeaders; 146 147 AString mMasterURL; 148 149 Vector<BandwidthItem> mBandwidthItems; 150 ssize_t mPrevBandwidthIndex; 151 152 sp<M3UParser> mPlaylist; 153 154 KeyedVector<AString, FetcherInfo> mFetcherInfos; 155 uint32_t mStreamMask; 156 157 // Masks used during reconfiguration: 158 // mNewStreamMask: streams in the variant playlist we're switching to; 159 // we don't want to immediately overwrite the original value. 160 uint32_t mNewStreamMask; 161 162 // mSwapMask: streams that have started to playback content in the new variant playlist; 163 // we use this to track reconfiguration progress. 164 uint32_t mSwapMask; 165 166 KeyedVector<StreamType, sp<AnotherPacketSource> > mPacketSources; 167 // A second set of packet sources that buffer content for the variant we're switching to. 168 KeyedVector<StreamType, sp<AnotherPacketSource> > mPacketSources2; 169 170 // A mutex used to serialize two sets of events: 171 // * the swapping of packet sources in dequeueAccessUnit on the player thread, AND 172 // * a forced bandwidth switch termination in cancelSwitch on the live looper. 173 Mutex mSwapMutex; 174 175 int32_t mCheckBandwidthGeneration; 176 int32_t mSwitchGeneration; 177 178 size_t mContinuationCounter; 179 sp<AMessage> mContinuation; 180 sp<AMessage> mSeekReply; 181 182 int64_t mLastDequeuedTimeUs; 183 int64_t mRealTimeBaseUs; 184 185 bool mReconfigurationInProgress; 186 bool mSwitchInProgress; 187 uint32_t mDisconnectReplyID; 188 uint32_t mSeekReplyID; 189 190 sp<PlaylistFetcher> addFetcher(const char *uri); 191 192 void onConnect(const sp<AMessage> &msg); 193 status_t onSeek(const sp<AMessage> &msg); 194 void onFinishDisconnect2(); 195 196 // If given a non-zero block_size (default 0), it is used to cap the number of 197 // bytes read in from the DataSource. If given a non-NULL buffer, new content 198 // is read into the end. 199 // 200 // The DataSource we read from is responsible for signaling error or EOF to help us 201 // break out of the read loop. The DataSource can be returned to the caller, so 202 // that the caller can reuse it for subsequent fetches (within the initially 203 // requested range). 204 // 205 // For reused HTTP sources, the caller must download a file sequentially without 206 // any overlaps or gaps to prevent reconnection. 207 ssize_t fetchFile( 208 const char *url, sp<ABuffer> *out, 209 /* request/open a file starting at range_offset for range_length bytes */ 210 int64_t range_offset = 0, int64_t range_length = -1, 211 /* download block size */ 212 uint32_t block_size = 0, 213 /* reuse DataSource if doing partial fetch */ 214 sp<DataSource> *source = NULL, 215 String8 *actualUrl = NULL); 216 217 sp<M3UParser> fetchPlaylist( 218 const char *url, uint8_t *curPlaylistHash, bool *unchanged); 219 220 size_t getBandwidthIndex(); 221 222 static int SortByBandwidth(const BandwidthItem *, const BandwidthItem *); 223 static StreamType indexToType(int idx); 224 225 void changeConfiguration( 226 int64_t timeUs, size_t bandwidthIndex, bool pickTrack = false); 227 void onChangeConfiguration(const sp<AMessage> &msg); 228 void onChangeConfiguration2(const sp<AMessage> &msg); 229 void onChangeConfiguration3(const sp<AMessage> &msg); 230 void onSwapped(const sp<AMessage> &msg); 231 void tryToFinishBandwidthSwitch(); 232 233 void scheduleCheckBandwidthEvent(); 234 void cancelCheckBandwidthEvent(); 235 236 // cancelBandwidthSwitch is atomic wrt swapPacketSource; call it to prevent packet sources 237 // from being swapped out on stale discontinuities while manipulating 238 // mPacketSources/mPacketSources2. 239 void cancelBandwidthSwitch(); 240 241 bool canSwitchBandwidthTo(size_t bandwidthIndex); 242 void onCheckBandwidth(); 243 244 void finishDisconnect(); 245 246 void postPrepared(status_t err); 247 248 void swapPacketSource(StreamType stream); 249 bool canSwitchUp(); 250 251 DISALLOW_EVIL_CONSTRUCTORS(LiveSession); 252}; 253 254} // namespace android 255 256#endif // LIVE_SESSION_H_ 257