MP4Source.cpp revision 56997121c5031598fbbba7b7c53980b7fd529c2d 
1/*
2 * Copyright (C) 2012 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#include "MP4Source.h"
18
19#include "FragmentedMP4Parser.h"
20#include "../NuPlayerStreamListener.h"
21
22#include <media/IStreamSource.h>
23#include <media/stagefright/foundation/AMessage.h>
24#include <media/stagefright/MediaErrors.h>
25#include <media/stagefright/MetaData.h>
26
27namespace android {
28
29struct StreamSource : public FragmentedMP4Parser::Source {
30    StreamSource(const sp<IStreamSource> &source)
31        : mListener(new NuPlayer::NuPlayerStreamListener(source, 0)),
32          mPosition(0) {
33        mListener->start();
34    }
35
36    virtual ssize_t readAt(off64_t offset, void *data, size_t size) {
37        if (offset < mPosition) {
38            return -EPIPE;
39        }
40
41        while (offset > mPosition) {
42            char buffer[1024];
43            off64_t skipBytes = offset - mPosition;
44            if (skipBytes > sizeof(buffer)) {
45                skipBytes = sizeof(buffer);
46            }
47
48            sp<AMessage> extra;
49            ssize_t n;
50            for (;;) {
51                n = mListener->read(buffer, skipBytes, &extra);
52
53                if (n == -EWOULDBLOCK) {
54                    usleep(10000);
55                    continue;
56                }
57
58                break;
59            }
60
61            ALOGV("skipped %ld bytes at offset %lld", n, mPosition);
62
63            if (n < 0) {
64                return n;
65            }
66
67            mPosition += n;
68        }
69
70        sp<AMessage> extra;
71        size_t total = 0;
72        while (total < size) {
73            ssize_t n = mListener->read(
74                    (uint8_t *)data + total, size - total, &extra);
75
76            if (n == -EWOULDBLOCK) {
77                usleep(10000);
78                continue;
79            } else if (n == 0) {
80                break;
81            } else if (n < 0) {
82                mPosition += total;
83                return n;
84            }
85
86            total += n;
87        }
88
89        ALOGV("read %ld bytes at offset %lld", n, mPosition);
90
91        mPosition += total;
92
93        return total;
94    }
95
96    bool isSeekable() {
97        return false;
98    }
99
100private:
101    sp<NuPlayer::NuPlayerStreamListener> mListener;
102    off64_t mPosition;
103
104    DISALLOW_EVIL_CONSTRUCTORS(StreamSource);
105};
106
107MP4Source::MP4Source(const sp<IStreamSource> &source)
108    : mSource(source),
109      mLooper(new ALooper),
110      mParser(new FragmentedMP4Parser),
111      mEOS(false) {
112    mLooper->registerHandler(mParser);
113}
114
115MP4Source::~MP4Source() {
116}
117
118void MP4Source::start() {
119    mLooper->start(false /* runOnCallingThread */);
120    mParser->start(new StreamSource(mSource));
121}
122
123status_t MP4Source::feedMoreTSData() {
124    return mEOS ? ERROR_END_OF_STREAM : (status_t)OK;
125}
126
127sp<AMessage> MP4Source::getFormat(bool audio) {
128    return mParser->getFormat(audio);
129}
130
131status_t MP4Source::dequeueAccessUnit(
132        bool audio, sp<ABuffer> *accessUnit) {
133    return mParser->dequeueAccessUnit(audio, accessUnit);
134}
135
136}  // namespace android
137