HTTPLiveSource.cpp revision 9b80c2bdb205bc143104f54d0743b6eedd67b14e 
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      mEOS(false),
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    mLiveSession->disconnect();
62    mLiveLooper->stop();
63}
64
65void NuPlayer::HTTPLiveSource::start() {
66    mLiveLooper = new ALooper;
67    mLiveLooper->setName("http live");
68    mLiveLooper->start();
69
70    mLiveSession = new LiveSession(
71            (mFlags & kFlagIncognito) ? LiveSession::kFlagIncognito : 0,
72            mUIDValid, mUID);
73
74    mLiveLooper->registerHandler(mLiveSession);
75
76    mLiveSession->connect(
77            mURL.c_str(), mExtraHeaders.isEmpty() ? NULL : &mExtraHeaders);
78
79    mTSParser = new ATSParser;
80}
81
82sp<MetaData> NuPlayer::HTTPLiveSource::getFormat(bool audio) {
83    ATSParser::SourceType type =
84        audio ? ATSParser::AUDIO : ATSParser::VIDEO;
85
86    sp<AnotherPacketSource> source =
87        static_cast<AnotherPacketSource *>(mTSParser->getSource(type).get());
88
89    if (source == NULL) {
90        return NULL;
91    }
92
93    return source->getFormat();
94}
95
96bool NuPlayer::HTTPLiveSource::feedMoreTSData() {
97    if (mEOS) {
98        return false;
99    }
100
101    sp<LiveDataSource> source =
102        static_cast<LiveDataSource *>(mLiveSession->getDataSource().get());
103
104    for (int32_t i = 0; i < 50; ++i) {
105        char buffer[188];
106        ssize_t n = source->readAtNonBlocking(mOffset, buffer, sizeof(buffer));
107
108        if (n == -EWOULDBLOCK) {
109            break;
110        } else if (n < 0) {
111            LOGI("input data EOS reached.");
112            mTSParser->signalEOS(n);
113            mEOS = true;
114            break;
115        } else {
116            if (buffer[0] == 0x00) {
117                // XXX legacy
118                sp<AMessage> extra;
119                mTSParser->signalDiscontinuity(
120                        buffer[1] == 0x00
121                            ? ATSParser::DISCONTINUITY_SEEK
122                            : ATSParser::DISCONTINUITY_FORMATCHANGE,
123                        extra);
124            } else {
125                mTSParser->feedTSPacket(buffer, sizeof(buffer));
126            }
127
128            mOffset += n;
129        }
130    }
131
132    return true;
133}
134
135status_t NuPlayer::HTTPLiveSource::dequeueAccessUnit(
136        bool audio, sp<ABuffer> *accessUnit) {
137    ATSParser::SourceType type =
138        audio ? ATSParser::AUDIO : ATSParser::VIDEO;
139
140    sp<AnotherPacketSource> source =
141        static_cast<AnotherPacketSource *>(mTSParser->getSource(type).get());
142
143    if (source == NULL) {
144        return -EWOULDBLOCK;
145    }
146
147    status_t finalResult;
148    if (!source->hasBufferAvailable(&finalResult)) {
149        return finalResult == OK ? -EWOULDBLOCK : finalResult;
150    }
151
152    return source->dequeueAccessUnit(accessUnit);
153}
154
155status_t NuPlayer::HTTPLiveSource::getDuration(int64_t *durationUs) {
156    return mLiveSession->getDuration(durationUs);
157}
158
159status_t NuPlayer::HTTPLiveSource::seekTo(int64_t seekTimeUs) {
160    // We need to make sure we're not seeking until we have seen the very first
161    // PTS timestamp in the whole stream (from the beginning of the stream).
162    while (!mTSParser->PTSTimeDeltaEstablished() && feedMoreTSData()) {
163        usleep(100000);
164    }
165
166    mLiveSession->seekTo(seekTimeUs);
167
168    return OK;
169}
170
171bool NuPlayer::HTTPLiveSource::isSeekable() {
172    return mLiveSession->isSeekable();
173}
174
175}  // namespace android
176
177