HTTPLiveSource.cpp revision 43c3e6ce02215ca99d506458f596cb1211639f29 
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(const char *url)
37    : mURL(url),
38      mEOS(false),
39      mOffset(0) {
40}
41
42NuPlayer::HTTPLiveSource::~HTTPLiveSource() {
43    mLiveSession->disconnect();
44    mLiveLooper->stop();
45}
46
47void NuPlayer::HTTPLiveSource::start() {
48    mLiveLooper = new ALooper;
49    mLiveLooper->setName("http live");
50    mLiveLooper->start();
51
52    mLiveSession = new LiveSession;
53    mLiveLooper->registerHandler(mLiveSession);
54
55    mLiveSession->connect(mURL.c_str());
56
57    mTSParser = new ATSParser;
58}
59
60sp<MetaData> NuPlayer::HTTPLiveSource::getFormat(bool audio) {
61    ATSParser::SourceType type =
62        audio ? ATSParser::MPEG2ADTS_AUDIO : ATSParser::AVC_VIDEO;
63
64    sp<AnotherPacketSource> source =
65        static_cast<AnotherPacketSource *>(mTSParser->getSource(type).get());
66
67    if (source == NULL) {
68        return NULL;
69    }
70
71    return source->getFormat();
72}
73
74bool NuPlayer::HTTPLiveSource::feedMoreTSData() {
75    if (mEOS) {
76        return false;
77    }
78
79    sp<LiveDataSource> source =
80        static_cast<LiveDataSource *>(mLiveSession->getDataSource().get());
81
82    for (int32_t i = 0; i < 10; ++i) {
83        char buffer[188];
84        ssize_t n = source->readAtNonBlocking(mOffset, buffer, sizeof(buffer));
85
86        if (n == -EWOULDBLOCK) {
87            break;
88        } else if (n < 0) {
89            LOGI("input data EOS reached.");
90            mTSParser->signalEOS(n);
91            mEOS = true;
92            break;
93        } else {
94            if (buffer[0] == 0x00) {
95                // XXX legacy
96                mTSParser->signalDiscontinuity(
97                        buffer[1] == 0x00
98                            ? ATSParser::DISCONTINUITY_SEEK
99                            : ATSParser::DISCONTINUITY_FORMATCHANGE);
100            } else {
101                mTSParser->feedTSPacket(buffer, sizeof(buffer));
102            }
103
104            mOffset += n;
105        }
106    }
107
108    return true;
109}
110
111status_t NuPlayer::HTTPLiveSource::dequeueAccessUnit(
112        bool audio, sp<ABuffer> *accessUnit) {
113    ATSParser::SourceType type =
114        audio ? ATSParser::MPEG2ADTS_AUDIO : ATSParser::AVC_VIDEO;
115
116    sp<AnotherPacketSource> source =
117        static_cast<AnotherPacketSource *>(mTSParser->getSource(type).get());
118
119    if (source == NULL) {
120        return -EWOULDBLOCK;
121    }
122
123    status_t finalResult;
124    if (!source->hasBufferAvailable(&finalResult)) {
125        return finalResult == OK ? -EWOULDBLOCK : finalResult;
126    }
127
128    return source->dequeueAccessUnit(accessUnit);
129}
130
131status_t NuPlayer::HTTPLiveSource::getDuration(int64_t *durationUs) {
132    return mLiveSession->getDuration(durationUs);
133}
134
135status_t NuPlayer::HTTPLiveSource::seekTo(int64_t seekTimeUs) {
136    // We need to make sure we're not seeking until we have seen the very first
137    // PTS timestamp in the whole stream (from the beginning of the stream).
138    while (!mTSParser->PTSTimeDeltaEstablished() && feedMoreTSData()) {
139        usleep(100000);
140    }
141
142    mLiveSession->seekTo(seekTimeUs);
143
144    return OK;
145}
146
147bool NuPlayer::HTTPLiveSource::isSeekable() {
148    return mLiveSession->isSeekable();
149}
150
151}  // namespace android
152
153