UDPPusher.cpp revision 1d15ab58bf8239069ef343de6cb21aabf3ef7d78 
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 "UDPPusher"
19#include <utils/Log.h>
20
21#include "UDPPusher.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 <utils/ByteOrder.h>
27
28#include <sys/socket.h>
29
30namespace android {
31
32UDPPusher::UDPPusher(const char *filename, unsigned port)
33    : mFile(fopen(filename, "rb")),
34      mFirstTimeMs(0),
35      mFirstTimeUs(0) {
36    CHECK(mFile != NULL);
37
38    mSocket = socket(AF_INET, SOCK_DGRAM, 0);
39
40    struct sockaddr_in addr;
41    memset(addr.sin_zero, 0, sizeof(addr.sin_zero));
42    addr.sin_family = AF_INET;
43    addr.sin_addr.s_addr = INADDR_ANY;
44    addr.sin_port = 0;
45
46    CHECK_EQ(0, bind(mSocket, (const struct sockaddr *)&addr, sizeof(addr)));
47
48    memset(mRemoteAddr.sin_zero, 0, sizeof(mRemoteAddr.sin_zero));
49    mRemoteAddr.sin_family = AF_INET;
50    mRemoteAddr.sin_addr.s_addr = INADDR_ANY;
51    mRemoteAddr.sin_port = htons(port);
52}
53
54UDPPusher::~UDPPusher() {
55    close(mSocket);
56    mSocket = -1;
57
58    fclose(mFile);
59    mFile = NULL;
60}
61
62void UDPPusher::start() {
63    uint32_t timeMs;
64    CHECK_EQ(fread(&timeMs, 1, sizeof(timeMs), mFile), sizeof(timeMs));
65    mFirstTimeMs = fromlel(timeMs);
66    mFirstTimeUs = ALooper::GetNowUs();
67
68    (new AMessage(kWhatPush, this))->post();
69}
70
71bool UDPPusher::onPush() {
72    uint32_t length;
73    if (fread(&length, 1, sizeof(length), mFile) < sizeof(length)) {
74        ALOGI("No more data to push.");
75        return false;
76    }
77
78    length = fromlel(length);
79
80    CHECK_GT(length, 0u);
81
82    sp<ABuffer> buffer = new ABuffer(length);
83    if (fread(buffer->data(), 1, length, mFile) < length) {
84        ALOGE("File truncated?.");
85        return false;
86    }
87
88    ssize_t n = sendto(
89            mSocket, buffer->data(), buffer->size(), 0,
90            (const struct sockaddr *)&mRemoteAddr, sizeof(mRemoteAddr));
91
92    CHECK_EQ(n, (ssize_t)buffer->size());
93
94    uint32_t timeMs;
95    if (fread(&timeMs, 1, sizeof(timeMs), mFile) < sizeof(timeMs)) {
96        ALOGI("No more data to push.");
97        return false;
98    }
99
100    timeMs = fromlel(timeMs);
101    CHECK_GE(timeMs, mFirstTimeMs);
102
103    timeMs -= mFirstTimeMs;
104    int64_t whenUs = mFirstTimeUs + timeMs * 1000ll;
105    int64_t nowUs = ALooper::GetNowUs();
106    (new AMessage(kWhatPush, this))->post(whenUs - nowUs);
107
108    return true;
109}
110
111void UDPPusher::onMessageReceived(const sp<AMessage> &msg) {
112    switch (msg->what()) {
113        case kWhatPush:
114        {
115            if (!onPush() && !(ntohs(mRemoteAddr.sin_port) & 1)) {
116                ALOGI("emulating BYE packet");
117
118                sp<ABuffer> buffer = new ABuffer(8);
119                uint8_t *data = buffer->data();
120                *data++ = (2 << 6) | 1;
121                *data++ = 203;
122                *data++ = 0;
123                *data++ = 1;
124                *data++ = 0x8f;
125                *data++ = 0x49;
126                *data++ = 0xc0;
127                *data++ = 0xd0;
128                buffer->setRange(0, 8);
129
130                struct sockaddr_in tmp = mRemoteAddr;
131                tmp.sin_port = htons(ntohs(mRemoteAddr.sin_port) | 1);
132
133                ssize_t n = sendto(
134                        mSocket, buffer->data(), buffer->size(), 0,
135                        (const struct sockaddr *)&tmp,
136                        sizeof(tmp));
137
138                CHECK_EQ(n, (ssize_t)buffer->size());
139            }
140            break;
141        }
142
143        default:
144            TRESPASS();
145            break;
146    }
147}
148
149}  // namespace android
150
151