HTTPLiveSource.cpp revision 5ab368af38fefacc4009e3ab1c1bbd00e62b3bcf 
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::start() {
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
86sp<MetaData> NuPlayer::HTTPLiveSource::getFormatMeta(bool audio) {
87    ATSParser::SourceType type =
88        audio ? ATSParser::AUDIO : ATSParser::VIDEO;
89
90    sp<AnotherPacketSource> source =
91        static_cast<AnotherPacketSource *>(mTSParser->getSource(type).get());
92
93    if (source == NULL) {
94        return NULL;
95    }
96
97    return source->getFormat();
98}
99
100status_t NuPlayer::HTTPLiveSource::feedMoreTSData() {
101    if (mFinalResult != OK) {
102        return mFinalResult;
103    }
104
105    sp<LiveDataSource> source =
106        static_cast<LiveDataSource *>(mLiveSession->getDataSource().get());
107
108    for (int32_t i = 0; i < 50; ++i) {
109        char buffer[188];
110        ssize_t n = source->readAtNonBlocking(mOffset, buffer, sizeof(buffer));
111
112        if (n == -EWOULDBLOCK) {
113            break;
114        } else if (n < 0) {
115            if (n != ERROR_END_OF_STREAM) {
116                ALOGI("input data EOS reached, error %ld", n);
117            } else {
118                ALOGI("input data EOS reached.");
119            }
120            mTSParser->signalEOS(n);
121            mFinalResult = n;
122            break;
123        } else {
124            if (buffer[0] == 0x00) {
125                // XXX legacy
126
127                uint8_t type = buffer[1];
128
129                sp<AMessage> extra = new AMessage;
130
131                if (type & 2) {
132                    int64_t mediaTimeUs;
133                    memcpy(&mediaTimeUs, &buffer[2], sizeof(mediaTimeUs));
134
135                    extra->setInt64(IStreamListener::kKeyMediaTimeUs, mediaTimeUs);
136                }
137
138                mTSParser->signalDiscontinuity(
139                        ((type & 1) == 0)
140                            ? ATSParser::DISCONTINUITY_SEEK
141                            : ATSParser::DISCONTINUITY_FORMATCHANGE,
142                        extra);
143            } else {
144                status_t err = mTSParser->feedTSPacket(buffer, sizeof(buffer));
145
146                if (err != OK) {
147                    ALOGE("TS Parser returned error %d", err);
148                    mTSParser->signalEOS(err);
149                    mFinalResult = err;
150                    break;
151                }
152            }
153
154            mOffset += n;
155        }
156    }
157
158    return OK;
159}
160
161status_t NuPlayer::HTTPLiveSource::dequeueAccessUnit(
162        bool audio, sp<ABuffer> *accessUnit) {
163    ATSParser::SourceType type =
164        audio ? ATSParser::AUDIO : ATSParser::VIDEO;
165
166    sp<AnotherPacketSource> source =
167        static_cast<AnotherPacketSource *>(mTSParser->getSource(type).get());
168
169    if (source == NULL) {
170        return -EWOULDBLOCK;
171    }
172
173    status_t finalResult;
174    if (!source->hasBufferAvailable(&finalResult)) {
175        return finalResult == OK ? -EWOULDBLOCK : finalResult;
176    }
177
178    return source->dequeueAccessUnit(accessUnit);
179}
180
181status_t NuPlayer::HTTPLiveSource::getDuration(int64_t *durationUs) {
182    return mLiveSession->getDuration(durationUs);
183}
184
185status_t NuPlayer::HTTPLiveSource::seekTo(int64_t seekTimeUs) {
186    // We need to make sure we're not seeking until we have seen the very first
187    // PTS timestamp in the whole stream (from the beginning of the stream).
188    while (!mTSParser->PTSTimeDeltaEstablished() && feedMoreTSData() == OK) {
189        usleep(100000);
190    }
191
192    mLiveSession->seekTo(seekTimeUs);
193
194    return OK;
195}
196
197uint32_t NuPlayer::HTTPLiveSource::flags() const {
198    uint32_t flags = 0;
199    if (mLiveSession->isSeekable()) {
200        flags |= FLAG_SEEKABLE;
201    }
202
203    if (mLiveSession->hasDynamicDuration()) {
204        flags |= FLAG_DYNAMIC_DURATION;
205    }
206
207    return flags;
208}
209
210}  // namespace android
211
212