DataSource.cpp revision ee7ff20e69498ebd53dd9717a0f984188341a75e 
1/*
2 * Copyright (C) 2009 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 "include/AMRExtractor.h"
18#include "include/MP3Extractor.h"
19#include "include/MPEG4Extractor.h"
20#include "include/WAVExtractor.h"
21#include "include/OggExtractor.h"
22
23#include <media/stagefright/CachingDataSource.h>
24#include <media/stagefright/DataSource.h>
25#include <media/stagefright/FileSource.h>
26#include <media/stagefright/HTTPDataSource.h>
27#include <media/stagefright/MediaErrors.h>
28#include <utils/String8.h>
29
30namespace android {
31
32bool DataSource::getUInt16(off_t offset, uint16_t *x) {
33    *x = 0;
34
35    uint8_t byte[2];
36    if (readAt(offset, byte, 2) != 2) {
37        return false;
38    }
39
40    *x = (byte[0] << 8) | byte[1];
41
42    return true;
43}
44
45status_t DataSource::getSize(off_t *size) {
46    *size = 0;
47
48    return ERROR_UNSUPPORTED;
49}
50
51////////////////////////////////////////////////////////////////////////////////
52
53Mutex DataSource::gSnifferMutex;
54List<DataSource::SnifferFunc> DataSource::gSniffers;
55
56bool DataSource::sniff(String8 *mimeType, float *confidence) {
57    *mimeType = "";
58    *confidence = 0.0f;
59
60    Mutex::Autolock autoLock(gSnifferMutex);
61    for (List<SnifferFunc>::iterator it = gSniffers.begin();
62         it != gSniffers.end(); ++it) {
63        String8 newMimeType;
64        float newConfidence;
65        if ((*it)(this, &newMimeType, &newConfidence)) {
66            if (newConfidence > *confidence) {
67                *mimeType = newMimeType;
68                *confidence = newConfidence;
69            }
70        }
71    }
72
73    return *confidence > 0.0;
74}
75
76// static
77void DataSource::RegisterSniffer(SnifferFunc func) {
78    Mutex::Autolock autoLock(gSnifferMutex);
79
80    for (List<SnifferFunc>::iterator it = gSniffers.begin();
81         it != gSniffers.end(); ++it) {
82        if (*it == func) {
83            return;
84        }
85    }
86
87    gSniffers.push_back(func);
88}
89
90// static
91void DataSource::RegisterDefaultSniffers() {
92    RegisterSniffer(SniffMP3);
93    RegisterSniffer(SniffMPEG4);
94    RegisterSniffer(SniffAMR);
95    RegisterSniffer(SniffWAV);
96    RegisterSniffer(SniffOgg);
97}
98
99// static
100sp<DataSource> DataSource::CreateFromURI(
101        const char *uri, const KeyedVector<String8, String8> *headers) {
102    sp<DataSource> source;
103    if (!strncasecmp("file://", uri, 7)) {
104        source = new FileSource(uri + 7);
105    } else if (!strncasecmp("http://", uri, 7)) {
106        sp<HTTPDataSource> httpSource = new HTTPDataSource(uri, headers);
107        if (httpSource->connect() != OK) {
108            return NULL;
109        }
110        source = new CachingDataSource(httpSource, 64 * 1024, 10);
111    } else {
112        // Assume it's a filename.
113        source = new FileSource(uri);
114    }
115
116    if (source == NULL || source->initCheck() != OK) {
117        return NULL;
118    }
119
120    return source;
121}
122
123}  // namespace android
124