UDPPusher.cpp revision 39ddf8e0f18766f7ba1e3246b774aa6ebd93eea8 
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#include "UDPPusher.h"
18
19#include <media/stagefright/foundation/ABuffer.h>
20#include <media/stagefright/foundation/ADebug.h>
21#include <media/stagefright/foundation/AMessage.h>
22#include <utils/ByteOrder.h>
23
24#include <sys/socket.h>
25
26namespace android {
27
28UDPPusher::UDPPusher(const char *filename, unsigned port)
29    : mFile(fopen(filename, "rb")),
30      mFirstTimeMs(0),
31      mFirstTimeUs(0) {
32    CHECK(mFile != NULL);
33
34    mSocket = socket(AF_INET, SOCK_DGRAM, 0);
35
36    struct sockaddr_in addr;
37    memset(addr.sin_zero, 0, sizeof(addr.sin_zero));
38    addr.sin_family = AF_INET;
39    addr.sin_addr.s_addr = INADDR_ANY;
40    addr.sin_port = 0;
41
42    CHECK_EQ(0, bind(mSocket, (const struct sockaddr *)&addr, sizeof(addr)));
43
44    memset(mRemoteAddr.sin_zero, 0, sizeof(mRemoteAddr.sin_zero));
45    mRemoteAddr.sin_family = AF_INET;
46    mRemoteAddr.sin_addr.s_addr = INADDR_ANY;
47    mRemoteAddr.sin_port = htons(port);
48}
49
50UDPPusher::~UDPPusher() {
51    close(mSocket);
52    mSocket = -1;
53
54    fclose(mFile);
55    mFile = NULL;
56}
57
58void UDPPusher::start() {
59    uint32_t timeMs;
60    CHECK_EQ(fread(&timeMs, 1, sizeof(timeMs), mFile), sizeof(timeMs));
61    mFirstTimeMs = fromlel(timeMs);
62    mFirstTimeUs = ALooper::GetNowUs();
63
64    (new AMessage(kWhatPush, id()))->post();
65}
66
67bool UDPPusher::onPush() {
68    uint32_t length;
69    if (fread(&length, 1, sizeof(length), mFile) < sizeof(length)) {
70        LOG(INFO) << "No more data to push.";
71        return false;
72    }
73
74    length = fromlel(length);
75
76    CHECK_GT(length, 0u);
77
78    sp<ABuffer> buffer = new ABuffer(length);
79    if (fread(buffer->data(), 1, length, mFile) < length) {
80        LOG(ERROR) << "File truncated?.";
81        return false;
82    }
83
84    ssize_t n = sendto(
85            mSocket, buffer->data(), buffer->size(), 0,
86            (const struct sockaddr *)&mRemoteAddr, sizeof(mRemoteAddr));
87
88    CHECK_EQ(n, (ssize_t)buffer->size());
89
90    uint32_t timeMs;
91    if (fread(&timeMs, 1, sizeof(timeMs), mFile) < sizeof(timeMs)) {
92        LOG(INFO) << "No more data to push.";
93        return false;
94    }
95
96    timeMs = fromlel(timeMs);
97    CHECK_GE(timeMs, mFirstTimeMs);
98
99    timeMs -= mFirstTimeMs;
100    int64_t whenUs = mFirstTimeUs + timeMs * 1000ll;
101    int64_t nowUs = ALooper::GetNowUs();
102    (new AMessage(kWhatPush, id()))->post(whenUs - nowUs);
103
104    return true;
105}
106
107void UDPPusher::onMessageReceived(const sp<AMessage> &msg) {
108    switch (msg->what()) {
109        case kWhatPush:
110        {
111            if (!onPush() && !(ntohs(mRemoteAddr.sin_port) & 1)) {
112                LOG(INFO) << "emulating BYE packet";
113
114                sp<ABuffer> buffer = new ABuffer(8);
115                uint8_t *data = buffer->data();
116                *data++ = (2 << 6) | 1;
117                *data++ = 203;
118                *data++ = 0;
119                *data++ = 1;
120                *data++ = 0x8f;
121                *data++ = 0x49;
122                *data++ = 0xc0;
123                *data++ = 0xd0;
124                buffer->setRange(0, 8);
125
126                struct sockaddr_in tmp = mRemoteAddr;
127                tmp.sin_port = htons(ntohs(mRemoteAddr.sin_port) | 1);
128
129                ssize_t n = sendto(
130                        mSocket, buffer->data(), buffer->size(), 0,
131                        (const struct sockaddr *)&tmp,
132                        sizeof(tmp));
133
134                CHECK_EQ(n, (ssize_t)buffer->size());
135            }
136            break;
137        }
138
139        default:
140            TRESPASS();
141            break;
142    }
143}
144
145}  // namespace android
146
147