HTTPLiveSource.cpp revision 29357bc2c0dd7c43ad3bd0c8e3efa4e6fd9bfd47 
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 char *url,
38        const KeyedVector<String8, String8> *headers,
39        bool uidValid, uid_t uid)
40    : mURL(url),
41      mUIDValid(uidValid),
42      mUID(uid),
43      mFlags(0),
44      mFinalResult(OK),
45      mOffset(0) {
46    if (headers) {
47        mExtraHeaders = *headers;
48
49        ssize_t index =
50            mExtraHeaders.indexOfKey(String8("x-hide-urls-from-log"));
51
52        if (index >= 0) {
53            mFlags |= kFlagIncognito;
54
55            mExtraHeaders.removeItemsAt(index);
56        }
57    }
58}
59
60NuPlayer::HTTPLiveSource::~HTTPLiveSource() {
61    if (mLiveSession != NULL) {
62        mLiveSession->disconnect();
63        mLiveLooper->stop();
64    }
65}
66
67void NuPlayer::HTTPLiveSource::start() {
68    mLiveLooper = new ALooper;
69    mLiveLooper->setName("http live");
70    mLiveLooper->start();
71
72    mLiveSession = new LiveSession(
73            (mFlags & kFlagIncognito) ? LiveSession::kFlagIncognito : 0,
74            mUIDValid, mUID);
75
76    mLiveLooper->registerHandler(mLiveSession);
77
78    mLiveSession->connect(
79            mURL.c_str(), mExtraHeaders.isEmpty() ? NULL : &mExtraHeaders);
80
81    mTSParser = new ATSParser;
82}
83
84sp<MetaData> NuPlayer::HTTPLiveSource::getFormat(bool audio) {
85    ATSParser::SourceType type =
86        audio ? ATSParser::AUDIO : ATSParser::VIDEO;
87
88    sp<AnotherPacketSource> source =
89        static_cast<AnotherPacketSource *>(mTSParser->getSource(type).get());
90
91    if (source == NULL) {
92        return NULL;
93    }
94
95    return source->getFormat();
96}
97
98status_t NuPlayer::HTTPLiveSource::feedMoreTSData() {
99    if (mFinalResult != OK) {
100        return mFinalResult;
101    }
102
103    sp<LiveDataSource> source =
104        static_cast<LiveDataSource *>(mLiveSession->getDataSource().get());
105
106    for (int32_t i = 0; i < 50; ++i) {
107        char buffer[188];
108        ssize_t n = source->readAtNonBlocking(mOffset, buffer, sizeof(buffer));
109
110        if (n == -EWOULDBLOCK) {
111            break;
112        } else if (n < 0) {
113            if (n != ERROR_END_OF_STREAM) {
114                ALOGI("input data EOS reached, error %ld", n);
115            } else {
116                ALOGI("input data EOS reached.");
117            }
118            mTSParser->signalEOS(n);
119            mFinalResult = n;
120            break;
121        } else {
122            if (buffer[0] == 0x00) {
123                // XXX legacy
124                sp<AMessage> extra;
125                mTSParser->signalDiscontinuity(
126                        buffer[1] == 0x00
127                            ? ATSParser::DISCONTINUITY_SEEK
128                            : ATSParser::DISCONTINUITY_FORMATCHANGE,
129                        extra);
130            } else {
131                status_t err = mTSParser->feedTSPacket(buffer, sizeof(buffer));
132
133                if (err != OK) {
134                    ALOGE("TS Parser returned error %d", err);
135                    mTSParser->signalEOS(err);
136                    mFinalResult = err;
137                    break;
138                }
139            }
140
141            mOffset += n;
142        }
143    }
144
145    return OK;
146}
147
148status_t NuPlayer::HTTPLiveSource::dequeueAccessUnit(
149        bool audio, sp<ABuffer> *accessUnit) {
150    ATSParser::SourceType type =
151        audio ? ATSParser::AUDIO : ATSParser::VIDEO;
152
153    sp<AnotherPacketSource> source =
154        static_cast<AnotherPacketSource *>(mTSParser->getSource(type).get());
155
156    if (source == NULL) {
157        return -EWOULDBLOCK;
158    }
159
160    status_t finalResult;
161    if (!source->hasBufferAvailable(&finalResult)) {
162        return finalResult == OK ? -EWOULDBLOCK : finalResult;
163    }
164
165    return source->dequeueAccessUnit(accessUnit);
166}
167
168status_t NuPlayer::HTTPLiveSource::getDuration(int64_t *durationUs) {
169    return mLiveSession->getDuration(durationUs);
170}
171
172status_t NuPlayer::HTTPLiveSource::seekTo(int64_t seekTimeUs) {
173    // We need to make sure we're not seeking until we have seen the very first
174    // PTS timestamp in the whole stream (from the beginning of the stream).
175    while (!mTSParser->PTSTimeDeltaEstablished() && feedMoreTSData() == OK) {
176        usleep(100000);
177    }
178
179    mLiveSession->seekTo(seekTimeUs);
180
181    return OK;
182}
183
184bool NuPlayer::HTTPLiveSource::isSeekable() {
185    return mLiveSession->isSeekable();
186}
187
188}  // namespace android
189
190