HTTPLiveSource.cpp revision ad0d9c9c39a24b7fbd94e935a5855c9025341929 
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    : mURL(url),
40      mFlags(0),
41      mEOS(false),
42      mOffset(0) {
43    if (headers) {
44        mExtraHeaders = *headers;
45
46        ssize_t index =
47            mExtraHeaders.indexOfKey(String8("x-hide-urls-from-log"));
48
49        if (index >= 0) {
50            mFlags |= kFlagIncognito;
51
52            mExtraHeaders.removeItemsAt(index);
53        }
54    }
55}
56
57NuPlayer::HTTPLiveSource::~HTTPLiveSource() {
58    mLiveSession->disconnect();
59    mLiveLooper->stop();
60}
61
62void NuPlayer::HTTPLiveSource::start() {
63    mLiveLooper = new ALooper;
64    mLiveLooper->setName("http live");
65    mLiveLooper->start();
66
67    mLiveSession = new LiveSession(
68            (mFlags & kFlagIncognito) ? LiveSession::kFlagIncognito : 0);
69
70    mLiveLooper->registerHandler(mLiveSession);
71
72    mLiveSession->connect(
73            mURL.c_str(), mExtraHeaders.isEmpty() ? NULL : &mExtraHeaders);
74
75    mTSParser = new ATSParser;
76}
77
78sp<MetaData> NuPlayer::HTTPLiveSource::getFormat(bool audio) {
79    ATSParser::SourceType type =
80        audio ? ATSParser::MPEG2ADTS_AUDIO : ATSParser::AVC_VIDEO;
81
82    sp<AnotherPacketSource> source =
83        static_cast<AnotherPacketSource *>(mTSParser->getSource(type).get());
84
85    if (source == NULL) {
86        return NULL;
87    }
88
89    return source->getFormat();
90}
91
92bool NuPlayer::HTTPLiveSource::feedMoreTSData() {
93    if (mEOS) {
94        return false;
95    }
96
97    sp<LiveDataSource> source =
98        static_cast<LiveDataSource *>(mLiveSession->getDataSource().get());
99
100    for (int32_t i = 0; i < 50; ++i) {
101        char buffer[188];
102        ssize_t n = source->readAtNonBlocking(mOffset, buffer, sizeof(buffer));
103
104        if (n == -EWOULDBLOCK) {
105            break;
106        } else if (n < 0) {
107            LOGI("input data EOS reached.");
108            mTSParser->signalEOS(n);
109            mEOS = true;
110            break;
111        } else {
112            if (buffer[0] == 0x00) {
113                // XXX legacy
114                sp<AMessage> extra;
115                mTSParser->signalDiscontinuity(
116                        buffer[1] == 0x00
117                            ? ATSParser::DISCONTINUITY_SEEK
118                            : ATSParser::DISCONTINUITY_FORMATCHANGE,
119                        extra);
120            } else {
121                mTSParser->feedTSPacket(buffer, sizeof(buffer));
122            }
123
124            mOffset += n;
125        }
126    }
127
128    return true;
129}
130
131status_t NuPlayer::HTTPLiveSource::dequeueAccessUnit(
132        bool audio, sp<ABuffer> *accessUnit) {
133    ATSParser::SourceType type =
134        audio ? ATSParser::MPEG2ADTS_AUDIO : ATSParser::AVC_VIDEO;
135
136    sp<AnotherPacketSource> source =
137        static_cast<AnotherPacketSource *>(mTSParser->getSource(type).get());
138
139    if (source == NULL) {
140        return -EWOULDBLOCK;
141    }
142
143    status_t finalResult;
144    if (!source->hasBufferAvailable(&finalResult)) {
145        return finalResult == OK ? -EWOULDBLOCK : finalResult;
146    }
147
148    return source->dequeueAccessUnit(accessUnit);
149}
150
151status_t NuPlayer::HTTPLiveSource::getDuration(int64_t *durationUs) {
152    return mLiveSession->getDuration(durationUs);
153}
154
155status_t NuPlayer::HTTPLiveSource::seekTo(int64_t seekTimeUs) {
156    // We need to make sure we're not seeking until we have seen the very first
157    // PTS timestamp in the whole stream (from the beginning of the stream).
158    while (!mTSParser->PTSTimeDeltaEstablished() && feedMoreTSData()) {
159        usleep(100000);
160    }
161
162    mLiveSession->seekTo(seekTimeUs);
163
164    return OK;
165}
166
167bool NuPlayer::HTTPLiveSource::isSeekable() {
168    return mLiveSession->isSeekable();
169}
170
171}  // namespace android
172
173