MediaExtractor.cpp revision 8ddeebb93cb41e7a8e9fe763afb6c6016b21fa61 
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#include "include/OggExtractor.h"
26#include "include/MPEG2TSExtractor.h"
27#include "include/DRMExtractor.h"
28#include "include/WVMExtractor.h"
29#include "include/FLACExtractor.h"
30#include "include/AACExtractor.h"
31
32#include "matroska/MatroskaExtractor.h"
33
34#include <media/stagefright/foundation/AMessage.h>
35#include <media/stagefright/DataSource.h>
36#include <media/stagefright/MediaDefs.h>
37#include <media/stagefright/MediaExtractor.h>
38#include <media/stagefright/MetaData.h>
39#include <utils/String8.h>
40
41namespace android {
42
43sp<MetaData> MediaExtractor::getMetaData() {
44    return new MetaData;
45}
46
47uint32_t MediaExtractor::flags() const {
48    return CAN_SEEK_BACKWARD | CAN_SEEK_FORWARD | CAN_PAUSE | CAN_SEEK;
49}
50
51// static
52sp<MediaExtractor> MediaExtractor::Create(
53        const sp<DataSource> &source, const char *mime) {
54    sp<AMessage> meta;
55
56    String8 tmp;
57    if (mime == NULL) {
58        float confidence;
59        if (!source->sniff(&tmp, &confidence, &meta)) {
60            LOGV("FAILED to autodetect media content.");
61
62            return NULL;
63        }
64
65        mime = tmp.string();
66        LOGV("Autodetected media content as '%s' with confidence %.2f",
67             mime, confidence);
68    }
69
70    bool isDrm = false;
71    // DRM MIME type syntax is "drm+type+original" where
72    // type is "es_based" or "container_based" and
73    // original is the content's cleartext MIME type
74    if (!strncmp(mime, "drm+", 4)) {
75        const char *originalMime = strchr(mime+4, '+');
76        if (originalMime == NULL) {
77            // second + not found
78            return NULL;
79        }
80        ++originalMime;
81        if (!strncmp(mime, "drm+es_based+", 13)) {
82            // DRMExtractor sets container metadata kKeyIsDRM to 1
83            return new DRMExtractor(source, originalMime);
84        } else if (!strncmp(mime, "drm+container_based+", 20)) {
85            mime = originalMime;
86            isDrm = true;
87        } else {
88            return NULL;
89        }
90    }
91
92    MediaExtractor *ret = NULL;
93    if (!strcasecmp(mime, MEDIA_MIMETYPE_CONTAINER_MPEG4)
94            || !strcasecmp(mime, "audio/mp4")) {
95        ret = new MPEG4Extractor(source);
96    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_MPEG)) {
97        ret = new MP3Extractor(source, meta);
98    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_AMR_NB)
99            || !strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_AMR_WB)) {
100        ret = new AMRExtractor(source);
101    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_FLAC)) {
102        ret = new FLACExtractor(source);
103    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_CONTAINER_WAV)) {
104        ret = new WAVExtractor(source);
105    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_CONTAINER_OGG)) {
106        ret = new OggExtractor(source);
107    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_CONTAINER_MATROSKA)) {
108        ret = new MatroskaExtractor(source);
109    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_CONTAINER_MPEG2TS)) {
110        ret = new MPEG2TSExtractor(source);
111    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_CONTAINER_WVM)) {
112        ret = new WVMExtractor(source);
113    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_AAC_ADTS)) {
114        ret = new AACExtractor(source);
115    }
116    if (ret != NULL && isDrm) {
117        ret->getMetaData()->setInt32(kKeyIsDRM, 1);
118    }
119
120    return ret;
121}
122
123}  // namespace android
124