MediaExtractor.cpp revision 0dba73763a04d39faf999dcc5ef12af3c99535a7 
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//#define LOG_NDEBUG 0
18#define LOG_TAG "MediaExtractor"
19#include <utils/Log.h>
20
21#include "include/AMRExtractor.h"
22#include "include/MP3Extractor.h"
23#include "include/MPEG4Extractor.h"
24#include "include/WAVExtractor.h"
25
26#include <media/stagefright/CachingDataSource.h>
27#include <media/stagefright/DataSource.h>
28#include <media/stagefright/HTTPDataSource.h>
29#include <media/stagefright/MediaDefs.h>
30#include <media/stagefright/MediaExtractor.h>
31#include <media/stagefright/MmapSource.h>
32#include <utils/String8.h>
33
34namespace android {
35
36// static
37sp<MediaExtractor> MediaExtractor::Create(
38        const sp<DataSource> &source, const char *mime) {
39    String8 tmp;
40    if (mime == NULL) {
41        float confidence;
42        if (!source->sniff(&tmp, &confidence)) {
43            LOGE("FAILED to autodetect media content.");
44
45            return NULL;
46        }
47
48        mime = tmp.string();
49        LOGV("Autodetected media content as '%s' with confidence %.2f",
50             mime, confidence);
51    }
52
53    if (!strcasecmp(mime, MEDIA_MIMETYPE_CONTAINER_MPEG4)
54            || !strcasecmp(mime, "audio/mp4")) {
55        return new MPEG4Extractor(source);
56    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_MPEG)) {
57        return new MP3Extractor(source);
58    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_AMR_NB)
59            || !strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_AMR_WB)) {
60        return new AMRExtractor(source);
61    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_CONTAINER_WAV)) {
62        return new WAVExtractor(source);
63    }
64
65    return NULL;
66}
67
68// static
69sp<MediaExtractor> MediaExtractor::CreateFromURI(
70        const char *uri, const char *mime) {
71    sp<DataSource> source;
72    if (!strncasecmp("file://", uri, 7)) {
73        source = new MmapSource(uri + 7);
74    } else if (!strncasecmp("http://", uri, 7)) {
75        source = new HTTPDataSource(uri);
76        source = new CachingDataSource(source, 64 * 1024, 10);
77    } else {
78        // Assume it's a filename.
79        source = new MmapSource(uri);
80    }
81
82    if (source == NULL || source->initCheck() != OK) {
83        return NULL;
84    }
85
86    return Create(source, mime);
87}
88
89}  // namespace android
90