HTTPLiveSource.cpp revision 22fc52f6f72f39e33c3970d0291de3569118aa5c
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//#define LOG_NDEBUG 0 18#define LOG_TAG "HTTPLiveSource" 19#include <utils/Log.h> 20 21#include "HTTPLiveSource.h" 22 23#include "ATSParser.h" 24#include "AnotherPacketSource.h" 25#include "LiveDataSource.h" 26#include "LiveSession.h" 27 28#include <media/stagefright/foundation/ABuffer.h> 29#include <media/stagefright/foundation/ADebug.h> 30#include <media/stagefright/foundation/AMessage.h> 31#include <media/stagefright/MediaErrors.h> 32#include <media/stagefright/MetaData.h> 33 34namespace android { 35 36NuPlayer::HTTPLiveSource::HTTPLiveSource(const char *url) 37 : mURL(url), 38 mEOS(false), 39 mOffset(0) { 40} 41 42NuPlayer::HTTPLiveSource::~HTTPLiveSource() { 43 mLiveSession->disconnect(); 44 mLiveLooper->stop(); 45} 46 47void NuPlayer::HTTPLiveSource::start() { 48 mLiveLooper = new ALooper; 49 mLiveLooper->setName("http live"); 50 mLiveLooper->start(); 51 52 mLiveSession = new LiveSession; 53 mLiveLooper->registerHandler(mLiveSession); 54 55 mLiveSession->connect(mURL.c_str()); 56 57 mTSParser = new ATSParser; 58} 59 60sp<MetaData> NuPlayer::HTTPLiveSource::getFormat(bool audio) { 61 ATSParser::SourceType type = 62 audio ? ATSParser::MPEG2ADTS_AUDIO : ATSParser::AVC_VIDEO; 63 64 sp<AnotherPacketSource> source = 65 static_cast<AnotherPacketSource *>(mTSParser->getSource(type).get()); 66 67 if (source == NULL) { 68 return NULL; 69 } 70 71 return source->getFormat(); 72} 73 74bool NuPlayer::HTTPLiveSource::feedMoreTSData() { 75 if (mEOS) { 76 return false; 77 } 78 79 sp<LiveDataSource> source = 80 static_cast<LiveDataSource *>(mLiveSession->getDataSource().get()); 81 82 for (int32_t i = 0; i < 50; ++i) { 83 char buffer[188]; 84 ssize_t n = source->readAtNonBlocking(mOffset, buffer, sizeof(buffer)); 85 86 if (n == -EWOULDBLOCK) { 87 break; 88 } else if (n < 0) { 89 LOGI("input data EOS reached."); 90 mTSParser->signalEOS(n); 91 mEOS = true; 92 break; 93 } else { 94 if (buffer[0] == 0x00) { 95 // XXX legacy 96 mTSParser->signalDiscontinuity( 97 buffer[1] == 0x00 98 ? ATSParser::DISCONTINUITY_SEEK 99 : ATSParser::DISCONTINUITY_FORMATCHANGE); 100 } else { 101 mTSParser->feedTSPacket(buffer, sizeof(buffer)); 102 } 103 104 mOffset += n; 105 } 106 } 107 108 return true; 109} 110 111status_t NuPlayer::HTTPLiveSource::dequeueAccessUnit( 112 bool audio, sp<ABuffer> *accessUnit) { 113 ATSParser::SourceType type = 114 audio ? ATSParser::MPEG2ADTS_AUDIO : ATSParser::AVC_VIDEO; 115 116 sp<AnotherPacketSource> source = 117 static_cast<AnotherPacketSource *>(mTSParser->getSource(type).get()); 118 119 if (source == NULL) { 120 return -EWOULDBLOCK; 121 } 122 123 status_t finalResult; 124 if (!source->hasBufferAvailable(&finalResult)) { 125 return finalResult == OK ? -EWOULDBLOCK : finalResult; 126 } 127 128 return source->dequeueAccessUnit(accessUnit); 129} 130 131status_t NuPlayer::HTTPLiveSource::getDuration(int64_t *durationUs) { 132 return mLiveSession->getDuration(durationUs); 133} 134 135status_t NuPlayer::HTTPLiveSource::seekTo(int64_t seekTimeUs) { 136 // We need to make sure we're not seeking until we have seen the very first 137 // PTS timestamp in the whole stream (from the beginning of the stream). 138 while (!mTSParser->PTSTimeDeltaEstablished() && feedMoreTSData()) { 139 usleep(100000); 140 } 141 142 mLiveSession->seekTo(seekTimeUs); 143 144 return OK; 145} 146 147bool NuPlayer::HTTPLiveSource::isSeekable() { 148 return mLiveSession->isSeekable(); 149} 150 151} // namespace android 152 153