ARTPSession.cpp revision 100a4408968b90e314526185d572c72ea4cc784a 
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 "ARTPSession"
19#include <utils/Log.h>
20
21#include "ARTPSession.h"
22
23#include <media/stagefright/foundation/ABuffer.h>
24#include <media/stagefright/foundation/ADebug.h>
25#include <media/stagefright/foundation/AMessage.h>
26#include <media/stagefright/foundation/hexdump.h>
27
28#include <ctype.h>
29#include <arpa/inet.h>
30#include <sys/socket.h>
31
32#include "APacketSource.h"
33#include "ARTPConnection.h"
34#include "ASessionDescription.h"
35
36namespace android {
37
38ARTPSession::ARTPSession()
39    : mInitCheck(NO_INIT) {
40}
41
42status_t ARTPSession::setup(const sp<ASessionDescription> &desc) {
43    CHECK_EQ(mInitCheck, (status_t)NO_INIT);
44
45    mDesc = desc;
46
47    mRTPConn = new ARTPConnection(ARTPConnection::kRegularlyRequestFIR);
48
49    looper()->registerHandler(mRTPConn);
50
51    for (size_t i = 1; i < mDesc->countTracks(); ++i) {
52        AString connection;
53        if (!mDesc->findAttribute(i, "c=", &connection)) {
54            // No per-stream connection information, try global fallback.
55            if (!mDesc->findAttribute(0, "c=", &connection)) {
56                LOGE("Unable to find connection attribute.");
57                return mInitCheck;
58            }
59        }
60        if (!(connection == "IN IP4 127.0.0.1")) {
61            LOGE("We only support localhost connections for now.");
62            return mInitCheck;
63        }
64
65        unsigned port;
66        if (!validateMediaFormat(i, &port) || (port & 1) != 0) {
67            LOGE("Invalid media format.");
68            return mInitCheck;
69        }
70
71        sp<APacketSource> source = new APacketSource(mDesc, i);
72        if (source->initCheck() != OK) {
73            LOGE("Unsupported format.");
74            return mInitCheck;
75        }
76
77        int rtpSocket = MakeUDPSocket(port);
78        int rtcpSocket = MakeUDPSocket(port + 1);
79
80        mTracks.push(TrackInfo());
81        TrackInfo *info = &mTracks.editItemAt(mTracks.size() - 1);
82        info->mRTPSocket = rtpSocket;
83        info->mRTCPSocket = rtcpSocket;
84
85        sp<AMessage> notify = new AMessage(kWhatAccessUnitComplete, id());
86        notify->setSize("track-index", mTracks.size() - 1);
87
88        mRTPConn->addStream(
89                rtpSocket, rtcpSocket, mDesc, i, notify, false /* injected */);
90
91        info->mPacketSource = source;
92    }
93
94    mInitCheck = OK;
95
96    return OK;
97}
98
99// static
100int ARTPSession::MakeUDPSocket(unsigned port) {
101    int s = socket(AF_INET, SOCK_DGRAM, 0);
102    CHECK_GE(s, 0);
103
104    struct sockaddr_in addr;
105    memset(addr.sin_zero, 0, sizeof(addr.sin_zero));
106    addr.sin_family = AF_INET;
107    addr.sin_addr.s_addr = INADDR_ANY;
108    addr.sin_port = htons(port);
109
110    CHECK_EQ(0, bind(s, (const struct sockaddr *)&addr, sizeof(addr)));
111
112    return s;
113}
114
115ARTPSession::~ARTPSession() {
116    for (size_t i = 0; i < mTracks.size(); ++i) {
117        TrackInfo *info = &mTracks.editItemAt(i);
118
119        info->mPacketSource->signalEOS(UNKNOWN_ERROR);
120
121        close(info->mRTPSocket);
122        close(info->mRTCPSocket);
123    }
124}
125
126void ARTPSession::onMessageReceived(const sp<AMessage> &msg) {
127    switch (msg->what()) {
128        case kWhatAccessUnitComplete:
129        {
130            int32_t firstRTCP;
131            if (msg->findInt32("first-rtcp", &firstRTCP)) {
132                // There won't be an access unit here, it's just a notification
133                // that the data communication worked since we got the first
134                // rtcp packet.
135                break;
136            }
137
138            size_t trackIndex;
139            CHECK(msg->findSize("track-index", &trackIndex));
140
141            int32_t eos;
142            if (msg->findInt32("eos", &eos) && eos) {
143                TrackInfo *info = &mTracks.editItemAt(trackIndex);
144                info->mPacketSource->signalEOS(ERROR_END_OF_STREAM);
145                break;
146            }
147
148            sp<RefBase> obj;
149            CHECK(msg->findObject("access-unit", &obj));
150
151            sp<ABuffer> accessUnit = static_cast<ABuffer *>(obj.get());
152
153            uint64_t ntpTime;
154            CHECK(accessUnit->meta()->findInt64(
155                        "ntp-time", (int64_t *)&ntpTime));
156
157#if 0
158#if 0
159            printf("access unit complete size=%d\tntp-time=0x%016llx\n",
160                   accessUnit->size(), ntpTime);
161#else
162            LOGI("access unit complete, size=%d, ntp-time=%llu",
163                 accessUnit->size(), ntpTime);
164            hexdump(accessUnit->data(), accessUnit->size());
165#endif
166#endif
167
168#if 0
169            CHECK_GE(accessUnit->size(), 5u);
170            CHECK(!memcmp("\x00\x00\x00\x01", accessUnit->data(), 4));
171            unsigned x = accessUnit->data()[4];
172
173            LOGI("access unit complete: nalType=0x%02x, nalRefIdc=0x%02x",
174                 x & 0x1f, (x & 0x60) >> 5);
175#endif
176
177            accessUnit->meta()->setInt64("ntp-time", ntpTime);
178            accessUnit->meta()->setInt64("timeUs", 0);
179
180#if 0
181            int32_t damaged;
182            if (accessUnit->meta()->findInt32("damaged", &damaged)
183                    && damaged != 0) {
184                LOGI("ignoring damaged AU");
185            } else
186#endif
187            {
188                TrackInfo *info = &mTracks.editItemAt(trackIndex);
189                info->mPacketSource->queueAccessUnit(accessUnit);
190            }
191            break;
192        }
193
194        default:
195            TRESPASS();
196            break;
197    }
198}
199
200bool ARTPSession::validateMediaFormat(size_t index, unsigned *port) const {
201    AString format;
202    mDesc->getFormat(index, &format);
203
204    ssize_t i = format.find(" ");
205    if (i < 0) {
206        return false;
207    }
208
209    ++i;
210    size_t j = i;
211    while (isdigit(format.c_str()[j])) {
212        ++j;
213    }
214    if (format.c_str()[j] != ' ') {
215        return false;
216    }
217
218    AString portString(format, i, j - i);
219
220    char *end;
221    unsigned long x = strtoul(portString.c_str(), &end, 10);
222    if (end == portString.c_str() || *end != '\0') {
223        return false;
224    }
225
226    if (x == 0 || x > 65535) {
227        return false;
228    }
229
230    *port = x;
231
232    return true;
233}
234
235size_t ARTPSession::countTracks() {
236    return mTracks.size();
237}
238
239sp<MediaSource> ARTPSession::trackAt(size_t index) {
240    CHECK_LT(index, mTracks.size());
241    return mTracks.editItemAt(index).mPacketSource;
242}
243
244}  // namespace android
245