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comparison: netwerk/protocol/rtsp/rtsp/ARTPSource.cpp
netwerk/protocol/rtsp/rtsp/ARTPSource.cpp
- branch
- TOR_BUG_9701
- changeset 13
- 44a2da4a2ab2
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| -1:000000000000 | 0:7eae163740cd |
|---|---|
| 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_TAG "ARTPSource" | |
| 18 #include "RtspPrlog.h" | |
| 19 | |
| 20 #include "ARTPSource.h" | |
| 21 | |
| 22 #include "AAMRAssembler.h" | |
| 23 #include "AAVCAssembler.h" | |
| 24 #include "AH263Assembler.h" | |
| 25 #include "AMPEG4AudioAssembler.h" | |
| 26 #include "AMPEG4ElementaryAssembler.h" | |
| 27 #include "ARawAudioAssembler.h" | |
| 28 #include "ASessionDescription.h" | |
| 29 | |
| 30 #include <media/stagefright/foundation/ABuffer.h> | |
| 31 #include <media/stagefright/foundation/ADebug.h> | |
| 32 #include <media/stagefright/foundation/AMessage.h> | |
| 33 | |
| 34 namespace android { | |
| 35 | |
| 36 static const uint32_t kSourceID = 0xdeadbeef; | |
| 37 | |
| 38 ARTPSource::ARTPSource( | |
| 39 uint32_t id, | |
| 40 const sp<ASessionDescription> &sessionDesc, size_t index, | |
| 41 const sp<AMessage> ¬ify) | |
| 42 : mID(id), | |
| 43 mHighestSeqNumber(0), | |
| 44 mNumBuffersReceived(0), | |
| 45 mLastNTPTime(0), | |
| 46 mLastNTPTimeUpdateUs(0), | |
| 47 mIssueFIRRequests(false), | |
| 48 mLastFIRRequestUs(-1), | |
| 49 mNextFIRSeqNo((rand() * 256.0) / RAND_MAX), | |
| 50 mNotify(notify) { | |
| 51 unsigned long PT; | |
| 52 AString desc; | |
| 53 AString params; | |
| 54 sessionDesc->getFormatType(index, &PT, &desc, ¶ms); | |
| 55 | |
| 56 if (!strncmp(desc.c_str(), "H264/", 5)) { | |
| 57 mAssembler = new AAVCAssembler(notify); | |
| 58 mIssueFIRRequests = true; | |
| 59 } else if (!strncmp(desc.c_str(), "MP4A-LATM/", 10)) { | |
| 60 mAssembler = new AMPEG4AudioAssembler(notify, params); | |
| 61 } else if (!strncmp(desc.c_str(), "H263-1998/", 10) | |
| 62 || !strncmp(desc.c_str(), "H263-2000/", 10)) { | |
| 63 mAssembler = new AH263Assembler(notify); | |
| 64 mIssueFIRRequests = true; | |
| 65 } else if (!strncmp(desc.c_str(), "AMR/", 4)) { | |
| 66 mAssembler = new AAMRAssembler(notify, false /* isWide */, params); | |
| 67 } else if (!strncmp(desc.c_str(), "AMR-WB/", 7)) { | |
| 68 mAssembler = new AAMRAssembler(notify, true /* isWide */, params); | |
| 69 } else if (!strncmp(desc.c_str(), "MP4V-ES/", 8) | |
| 70 || !strncasecmp(desc.c_str(), "mpeg4-generic/", 14)) { | |
| 71 mAssembler = new AMPEG4ElementaryAssembler(notify, desc, params); | |
| 72 mIssueFIRRequests = true; | |
| 73 } else if (ARawAudioAssembler::Supports(desc.c_str())) { | |
| 74 mAssembler = new ARawAudioAssembler(notify, desc.c_str(), params); | |
| 75 } else { | |
| 76 TRESPASS(); | |
| 77 } | |
| 78 } | |
| 79 | |
| 80 static uint32_t AbsDiff(uint32_t seq1, uint32_t seq2) { | |
| 81 return seq1 > seq2 ? seq1 - seq2 : seq2 - seq1; | |
| 82 } | |
| 83 | |
| 84 void ARTPSource::processRTPPacket(const sp<ABuffer> &buffer) { | |
| 85 if (queuePacket(buffer) && mAssembler != NULL) { | |
| 86 mAssembler->onPacketReceived(this); | |
| 87 } | |
| 88 } | |
| 89 | |
| 90 void ARTPSource::timeUpdate(uint32_t rtpTime, uint64_t ntpTime) { | |
| 91 mLastNTPTime = ntpTime; | |
| 92 mLastNTPTimeUpdateUs = ALooper::GetNowUs(); | |
| 93 | |
| 94 sp<AMessage> notify = mNotify->dup(); | |
| 95 notify->setInt32("time-update", true); | |
| 96 notify->setInt32("rtp-time", rtpTime); | |
| 97 notify->setInt64("ntp-time", ntpTime); | |
| 98 notify->post(); | |
| 99 } | |
| 100 | |
| 101 bool ARTPSource::queuePacket(const sp<ABuffer> &buffer) { | |
| 102 uint32_t seqNum = (uint32_t)buffer->int32Data(); | |
| 103 | |
| 104 if (mNumBuffersReceived++ == 0) { | |
| 105 mHighestSeqNumber = seqNum; | |
| 106 mQueue.push_back(buffer); | |
| 107 return true; | |
| 108 } | |
| 109 | |
| 110 // Only the lower 16-bit of the sequence numbers are transmitted, | |
| 111 // derive the high-order bits by choosing the candidate closest | |
| 112 // to the highest sequence number (extended to 32 bits) received so far. | |
| 113 | |
| 114 uint32_t seq1 = seqNum | (mHighestSeqNumber & 0xffff0000); | |
| 115 uint32_t seq2 = seqNum | ((mHighestSeqNumber & 0xffff0000) + 0x10000); | |
| 116 uint32_t seq3 = seqNum | ((mHighestSeqNumber & 0xffff0000) - 0x10000); | |
| 117 uint32_t diff1 = AbsDiff(seq1, mHighestSeqNumber); | |
| 118 uint32_t diff2 = AbsDiff(seq2, mHighestSeqNumber); | |
| 119 uint32_t diff3 = AbsDiff(seq3, mHighestSeqNumber); | |
| 120 | |
| 121 if (diff1 < diff2) { | |
| 122 if (diff1 < diff3) { | |
| 123 // diff1 < diff2 ^ diff1 < diff3 | |
| 124 seqNum = seq1; | |
| 125 } else { | |
| 126 // diff3 <= diff1 < diff2 | |
| 127 seqNum = seq3; | |
| 128 } | |
| 129 } else if (diff2 < diff3) { | |
| 130 // diff2 <= diff1 ^ diff2 < diff3 | |
| 131 seqNum = seq2; | |
| 132 } else { | |
| 133 // diff3 <= diff2 <= diff1 | |
| 134 seqNum = seq3; | |
| 135 } | |
| 136 | |
| 137 if (seqNum > mHighestSeqNumber) { | |
| 138 mHighestSeqNumber = seqNum; | |
| 139 } | |
| 140 | |
| 141 buffer->setInt32Data(seqNum); | |
| 142 | |
| 143 List<sp<ABuffer> >::iterator it = mQueue.begin(); | |
| 144 while (it != mQueue.end() && (uint32_t)(*it)->int32Data() < seqNum) { | |
| 145 ++it; | |
| 146 } | |
| 147 | |
| 148 if (it != mQueue.end() && (uint32_t)(*it)->int32Data() == seqNum) { | |
| 149 LOGW("Discarding duplicate buffer"); | |
| 150 return false; | |
| 151 } | |
| 152 | |
| 153 mQueue.insert(it, buffer); | |
| 154 | |
| 155 return true; | |
| 156 } | |
| 157 | |
| 158 void ARTPSource::byeReceived() { | |
| 159 mAssembler->onByeReceived(); | |
| 160 } | |
| 161 | |
| 162 void ARTPSource::addFIR(const sp<ABuffer> &buffer) { | |
| 163 if (!mIssueFIRRequests) { | |
| 164 return; | |
| 165 } | |
| 166 | |
| 167 int64_t nowUs = ALooper::GetNowUs(); | |
| 168 if (mLastFIRRequestUs >= 0 && mLastFIRRequestUs + 5000000ll > nowUs) { | |
| 169 // Send FIR requests at most every 5 secs. | |
| 170 return; | |
| 171 } | |
| 172 | |
| 173 mLastFIRRequestUs = nowUs; | |
| 174 | |
| 175 if (buffer->size() + 20 > buffer->capacity()) { | |
| 176 LOGW("RTCP buffer too small to accomodate FIR."); | |
| 177 return; | |
| 178 } | |
| 179 | |
| 180 uint8_t *data = buffer->data() + buffer->size(); | |
| 181 | |
| 182 data[0] = 0x80 | 4; | |
| 183 data[1] = 206; // PSFB | |
| 184 data[2] = 0; | |
| 185 data[3] = 4; | |
| 186 data[4] = kSourceID >> 24; | |
| 187 data[5] = (kSourceID >> 16) & 0xff; | |
| 188 data[6] = (kSourceID >> 8) & 0xff; | |
| 189 data[7] = kSourceID & 0xff; | |
| 190 | |
| 191 data[8] = 0x00; // SSRC of media source (unused) | |
| 192 data[9] = 0x00; | |
| 193 data[10] = 0x00; | |
| 194 data[11] = 0x00; | |
| 195 | |
| 196 data[12] = mID >> 24; | |
| 197 data[13] = (mID >> 16) & 0xff; | |
| 198 data[14] = (mID >> 8) & 0xff; | |
| 199 data[15] = mID & 0xff; | |
| 200 | |
| 201 data[16] = mNextFIRSeqNo++; // Seq Nr. | |
| 202 | |
| 203 data[17] = 0x00; // Reserved | |
| 204 data[18] = 0x00; | |
| 205 data[19] = 0x00; | |
| 206 | |
| 207 buffer->setRange(buffer->offset(), buffer->size() + 20); | |
| 208 | |
| 209 LOGV("Added FIR request."); | |
| 210 } | |
| 211 | |
| 212 void ARTPSource::addReceiverReport(const sp<ABuffer> &buffer) { | |
| 213 if (buffer->size() + 32 > buffer->capacity()) { | |
| 214 LOGW("RTCP buffer too small to accomodate RR."); | |
| 215 return; | |
| 216 } | |
| 217 | |
| 218 uint8_t *data = buffer->data() + buffer->size(); | |
| 219 | |
| 220 data[0] = 0x80 | 1; | |
| 221 data[1] = 201; // RR | |
| 222 data[2] = 0; | |
| 223 data[3] = 7; | |
| 224 data[4] = kSourceID >> 24; | |
| 225 data[5] = (kSourceID >> 16) & 0xff; | |
| 226 data[6] = (kSourceID >> 8) & 0xff; | |
| 227 data[7] = kSourceID & 0xff; | |
| 228 | |
| 229 data[8] = mID >> 24; | |
| 230 data[9] = (mID >> 16) & 0xff; | |
| 231 data[10] = (mID >> 8) & 0xff; | |
| 232 data[11] = mID & 0xff; | |
| 233 | |
| 234 data[12] = 0x00; // fraction lost | |
| 235 | |
| 236 data[13] = 0x00; // cumulative lost | |
| 237 data[14] = 0x00; | |
| 238 data[15] = 0x00; | |
| 239 | |
| 240 data[16] = mHighestSeqNumber >> 24; | |
| 241 data[17] = (mHighestSeqNumber >> 16) & 0xff; | |
| 242 data[18] = (mHighestSeqNumber >> 8) & 0xff; | |
| 243 data[19] = mHighestSeqNumber & 0xff; | |
| 244 | |
| 245 data[20] = 0x00; // Interarrival jitter | |
| 246 data[21] = 0x00; | |
| 247 data[22] = 0x00; | |
| 248 data[23] = 0x00; | |
| 249 | |
| 250 uint32_t LSR = 0; | |
| 251 uint32_t DLSR = 0; | |
| 252 if (mLastNTPTime != 0) { | |
| 253 LSR = (mLastNTPTime >> 16) & 0xffffffff; | |
| 254 | |
| 255 DLSR = (uint32_t) | |
| 256 ((ALooper::GetNowUs() - mLastNTPTimeUpdateUs) * 65536.0 / 1E6); | |
| 257 } | |
| 258 | |
| 259 data[24] = LSR >> 24; | |
| 260 data[25] = (LSR >> 16) & 0xff; | |
| 261 data[26] = (LSR >> 8) & 0xff; | |
| 262 data[27] = LSR & 0xff; | |
| 263 | |
| 264 data[28] = DLSR >> 24; | |
| 265 data[29] = (DLSR >> 16) & 0xff; | |
| 266 data[30] = (DLSR >> 8) & 0xff; | |
| 267 data[31] = DLSR & 0xff; | |
| 268 | |
| 269 buffer->setRange(buffer->offset(), buffer->size() + 32); | |
| 270 } | |
| 271 | |
| 272 } // namespace android | |
| 273 | |
| 274 |
