ARTPSession.cpp revision 6e4c5c499999c04c2477b987f9e64f3ff2bf1a06 
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(
48            ARTPConnection::kFakeTimestamps
49                | ARTPConnection::kRegularlyRequestFIR);
50
51    looper()->registerHandler(mRTPConn);
52
53    for (size_t i = 1; i < mDesc->countTracks(); ++i) {
54        AString connection;
55        if (!mDesc->findAttribute(i, "c=", &connection)) {
56            // No per-stream connection information, try global fallback.
57            if (!mDesc->findAttribute(0, "c=", &connection)) {
58                LOGE("Unable to find connection attribute.");
59                return mInitCheck;
60            }
61        }
62        if (!(connection == "IN IP4 127.0.0.1")) {
63            LOGE("We only support localhost connections for now.");
64            return mInitCheck;
65        }
66
67        unsigned port;
68        if (!validateMediaFormat(i, &port) || (port & 1) != 0) {
69            LOGE("Invalid media format.");
70            return mInitCheck;
71        }
72
73        sp<APacketSource> source = new APacketSource(mDesc, i);
74        if (source->initCheck() != OK) {
75            LOGE("Unsupported format.");
76            return mInitCheck;
77        }
78
79        int rtpSocket = MakeUDPSocket(port);
80        int rtcpSocket = MakeUDPSocket(port + 1);
81
82        mTracks.push(TrackInfo());
83        TrackInfo *info = &mTracks.editItemAt(mTracks.size() - 1);
84        info->mRTPSocket = rtpSocket;
85        info->mRTCPSocket = rtcpSocket;
86
87        sp<AMessage> notify = new AMessage(kWhatAccessUnitComplete, id());
88        notify->setSize("track-index", mTracks.size() - 1);
89
90        mRTPConn->addStream(
91                rtpSocket, rtcpSocket, mDesc, i, notify, false /* injected */);
92
93        info->mPacketSource = source;
94    }
95
96    mInitCheck = OK;
97
98    return OK;
99}
100
101// static
102int ARTPSession::MakeUDPSocket(unsigned port) {
103    int s = socket(AF_INET, SOCK_DGRAM, 0);
104    CHECK_GE(s, 0);
105
106    struct sockaddr_in addr;
107    memset(addr.sin_zero, 0, sizeof(addr.sin_zero));
108    addr.sin_family = AF_INET;
109    addr.sin_addr.s_addr = INADDR_ANY;
110    addr.sin_port = htons(port);
111
112    CHECK_EQ(0, bind(s, (const struct sockaddr *)&addr, sizeof(addr)));
113
114    return s;
115}
116
117ARTPSession::~ARTPSession() {
118    for (size_t i = 0; i < mTracks.size(); ++i) {
119        TrackInfo *info = &mTracks.editItemAt(i);
120
121        info->mPacketSource->signalEOS(UNKNOWN_ERROR);
122
123        close(info->mRTPSocket);
124        close(info->mRTCPSocket);
125    }
126}
127
128void ARTPSession::onMessageReceived(const sp<AMessage> &msg) {
129    switch (msg->what()) {
130        case kWhatAccessUnitComplete:
131        {
132            int32_t firstRTCP;
133            if (msg->findInt32("first-rtcp", &firstRTCP)) {
134                // There won't be an access unit here, it's just a notification
135                // that the data communication worked since we got the first
136                // rtcp packet.
137                break;
138            }
139
140            size_t trackIndex;
141            CHECK(msg->findSize("track-index", &trackIndex));
142
143            int32_t eos;
144            if (msg->findInt32("eos", &eos) && eos) {
145                TrackInfo *info = &mTracks.editItemAt(trackIndex);
146                info->mPacketSource->signalEOS(ERROR_END_OF_STREAM);
147                break;
148            }
149
150            sp<RefBase> obj;
151            CHECK(msg->findObject("access-unit", &obj));
152
153            sp<ABuffer> accessUnit = static_cast<ABuffer *>(obj.get());
154
155            uint64_t ntpTime;
156            CHECK(accessUnit->meta()->findInt64(
157                        "ntp-time", (int64_t *)&ntpTime));
158
159#if 0
160#if 0
161            printf("access unit complete size=%d\tntp-time=0x%016llx\n",
162                   accessUnit->size(), ntpTime);
163#else
164            LOGI("access unit complete, size=%d, ntp-time=%llu",
165                 accessUnit->size(), ntpTime);
166            hexdump(accessUnit->data(), accessUnit->size());
167#endif
168#endif
169
170#if 0
171            CHECK_GE(accessUnit->size(), 5u);
172            CHECK(!memcmp("\x00\x00\x00\x01", accessUnit->data(), 4));
173            unsigned x = accessUnit->data()[4];
174
175            LOGI("access unit complete: nalType=0x%02x, nalRefIdc=0x%02x",
176                 x & 0x1f, (x & 0x60) >> 5);
177#endif
178
179            accessUnit->meta()->setInt64("ntp-time", ntpTime);
180            accessUnit->meta()->setInt64("timeUs", 0);
181
182#if 0
183            int32_t damaged;
184            if (accessUnit->meta()->findInt32("damaged", &damaged)
185                    && damaged != 0) {
186                LOGI("ignoring damaged AU");
187            } else
188#endif
189            {
190                TrackInfo *info = &mTracks.editItemAt(trackIndex);
191                info->mPacketSource->queueAccessUnit(accessUnit);
192            }
193            break;
194        }
195
196        default:
197            TRESPASS();
198            break;
199    }
200}
201
202bool ARTPSession::validateMediaFormat(size_t index, unsigned *port) const {
203    AString format;
204    mDesc->getFormat(index, &format);
205
206    ssize_t i = format.find(" ");
207    if (i < 0) {
208        return false;
209    }
210
211    ++i;
212    size_t j = i;
213    while (isdigit(format.c_str()[j])) {
214        ++j;
215    }
216    if (format.c_str()[j] != ' ') {
217        return false;
218    }
219
220    AString portString(format, i, j - i);
221
222    char *end;
223    unsigned long x = strtoul(portString.c_str(), &end, 10);
224    if (end == portString.c_str() || *end != '\0') {
225        return false;
226    }
227
228    if (x == 0 || x > 65535) {
229        return false;
230    }
231
232    *port = x;
233
234    return true;
235}
236
237size_t ARTPSession::countTracks() {
238    return mTracks.size();
239}
240
241sp<MediaSource> ARTPSession::trackAt(size_t index) {
242    CHECK_LT(index, mTracks.size());
243    return mTracks.editItemAt(index).mPacketSource;
244}
245
246}  // namespace android
247