HTTPLiveSource.cpp revision 9575c96b6e418914e2ffc6741ecc8d71e3968dbe 
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 "HTTPLiveSource"
19#include <utils/Log.h>
20
21#include "HTTPLiveSource.h"
22
23#include "ATSParser.h"
24#include "AnotherPacketSource.h"
25#include "LiveDataSource.h"
26#include "LiveSession.h"
27
28#include <media/stagefright/foundation/ABuffer.h>
29#include <media/stagefright/foundation/ADebug.h>
30#include <media/stagefright/foundation/AMessage.h>
31#include <media/stagefright/MediaErrors.h>
32#include <media/stagefright/MetaData.h>
33
34namespace android {
35
36NuPlayer::HTTPLiveSource::HTTPLiveSource(
37        const sp<AMessage> &notify,
38        const char *url,
39        const KeyedVector<String8, String8> *headers,
40        bool uidValid, uid_t uid)
41    : Source(notify),
42      mURL(url),
43      mUIDValid(uidValid),
44      mUID(uid),
45      mFlags(0),
46      mFinalResult(OK),
47      mOffset(0) {
48    if (headers) {
49        mExtraHeaders = *headers;
50
51        ssize_t index =
52            mExtraHeaders.indexOfKey(String8("x-hide-urls-from-log"));
53
54        if (index >= 0) {
55            mFlags |= kFlagIncognito;
56
57            mExtraHeaders.removeItemsAt(index);
58        }
59    }
60}
61
62NuPlayer::HTTPLiveSource::~HTTPLiveSource() {
63    if (mLiveSession != NULL) {
64        mLiveSession->disconnect();
65        mLiveLooper->stop();
66    }
67}
68
69void NuPlayer::HTTPLiveSource::prepareAsync() {
70    mLiveLooper = new ALooper;
71    mLiveLooper->setName("http live");
72    mLiveLooper->start();
73
74    mLiveSession = new LiveSession(
75            (mFlags & kFlagIncognito) ? LiveSession::kFlagIncognito : 0,
76            mUIDValid, mUID);
77
78    mLiveLooper->registerHandler(mLiveSession);
79
80    mLiveSession->connect(
81            mURL.c_str(), mExtraHeaders.isEmpty() ? NULL : &mExtraHeaders);
82
83    mTSParser = new ATSParser;
84
85    notifyVideoSizeChanged(0, 0);
86
87    uint32_t flags = FLAG_CAN_PAUSE;
88    if (mLiveSession->isSeekable()) {
89        flags |= FLAG_CAN_SEEK;
90        flags |= FLAG_CAN_SEEK_BACKWARD;
91        flags |= FLAG_CAN_SEEK_FORWARD;
92    }
93
94    if (mLiveSession->hasDynamicDuration()) {
95        flags |= FLAG_DYNAMIC_DURATION;
96    }
97
98    notifyFlagsChanged(flags);
99
100    notifyPrepared();
101}
102
103void NuPlayer::HTTPLiveSource::start() {
104}
105
106sp<MetaData> NuPlayer::HTTPLiveSource::getFormatMeta(bool audio) {
107    ATSParser::SourceType type =
108        audio ? ATSParser::AUDIO : ATSParser::VIDEO;
109
110    sp<AnotherPacketSource> source =
111        static_cast<AnotherPacketSource *>(mTSParser->getSource(type).get());
112
113    if (source == NULL) {
114        return NULL;
115    }
116
117    return source->getFormat();
118}
119
120status_t NuPlayer::HTTPLiveSource::feedMoreTSData() {
121    if (mFinalResult != OK) {
122        return mFinalResult;
123    }
124
125    sp<LiveDataSource> source =
126        static_cast<LiveDataSource *>(mLiveSession->getDataSource().get());
127
128    for (int32_t i = 0; i < 50; ++i) {
129        char buffer[188];
130        ssize_t n = source->readAtNonBlocking(mOffset, buffer, sizeof(buffer));
131
132        if (n == -EWOULDBLOCK) {
133            break;
134        } else if (n < 0) {
135            if (n != ERROR_END_OF_STREAM) {
136                ALOGI("input data EOS reached, error %ld", n);
137            } else {
138                ALOGI("input data EOS reached.");
139            }
140            mTSParser->signalEOS(n);
141            mFinalResult = n;
142            break;
143        } else {
144            if (buffer[0] == 0x00) {
145                // XXX legacy
146
147                uint8_t type = buffer[1];
148
149                sp<AMessage> extra = new AMessage;
150
151                if (type & 2) {
152                    int64_t mediaTimeUs;
153                    memcpy(&mediaTimeUs, &buffer[2], sizeof(mediaTimeUs));
154
155                    extra->setInt64(IStreamListener::kKeyMediaTimeUs, mediaTimeUs);
156                }
157
158                mTSParser->signalDiscontinuity(
159                        ((type & 1) == 0)
160                            ? ATSParser::DISCONTINUITY_SEEK
161                            : ATSParser::DISCONTINUITY_FORMATCHANGE,
162                        extra);
163            } else {
164                status_t err = mTSParser->feedTSPacket(buffer, sizeof(buffer));
165
166                if (err != OK) {
167                    ALOGE("TS Parser returned error %d", err);
168                    mTSParser->signalEOS(err);
169                    mFinalResult = err;
170                    break;
171                }
172            }
173
174            mOffset += n;
175        }
176    }
177
178    return OK;
179}
180
181status_t NuPlayer::HTTPLiveSource::dequeueAccessUnit(
182        bool audio, sp<ABuffer> *accessUnit) {
183    ATSParser::SourceType type =
184        audio ? ATSParser::AUDIO : ATSParser::VIDEO;
185
186    sp<AnotherPacketSource> source =
187        static_cast<AnotherPacketSource *>(mTSParser->getSource(type).get());
188
189    if (source == NULL) {
190        return -EWOULDBLOCK;
191    }
192
193    status_t finalResult;
194    if (!source->hasBufferAvailable(&finalResult)) {
195        return finalResult == OK ? -EWOULDBLOCK : finalResult;
196    }
197
198    return source->dequeueAccessUnit(accessUnit);
199}
200
201status_t NuPlayer::HTTPLiveSource::getDuration(int64_t *durationUs) {
202    return mLiveSession->getDuration(durationUs);
203}
204
205status_t NuPlayer::HTTPLiveSource::seekTo(int64_t seekTimeUs) {
206    // We need to make sure we're not seeking until we have seen the very first
207    // PTS timestamp in the whole stream (from the beginning of the stream).
208    while (!mTSParser->PTSTimeDeltaEstablished() && feedMoreTSData() == OK) {
209        usleep(100000);
210    }
211
212    mLiveSession->seekTo(seekTimeUs);
213
214    return OK;
215}
216
217}  // namespace android
218
219