/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.media;
import android.content.ContentResolver;
import android.content.Context;
import android.content.res.AssetFileDescriptor;
import android.media.MediaCodec;
import android.media.MediaFormat;
import android.media.MediaHTTPService;
import android.net.Uri;
import android.os.IBinder;
import java.io.FileDescriptor;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;
/**
* MediaExtractor facilitates extraction of demuxed, typically encoded, media data
* from a data source.
* <p>It is generally used like this:
* <pre>
* MediaExtractor extractor = new MediaExtractor();
* extractor.setDataSource(...);
* int numTracks = extractor.getTrackCount();
* for (int i = 0; i < numTracks; ++i) {
* MediaFormat format = extractor.getTrackFormat(i);
* String mime = format.getString(MediaFormat.KEY_MIME);
* if (weAreInterestedInThisTrack) {
* extractor.selectTrack(i);
* }
* }
* ByteBuffer inputBuffer = ByteBuffer.allocate(...)
* while (extractor.readSampleData(inputBuffer, ...) >= 0) {
* int trackIndex = extractor.getSampleTrackIndex();
* long presentationTimeUs = extractor.getSampleTime();
* ...
* extractor.advance();
* }
*
* extractor.release();
* extractor = null;
* </pre>
*/
final public class MediaExtractor {
public MediaExtractor() {
native_setup();
}
/**
* Sets the DataSource object to be used as the data source for this extractor
* {@hide}
*/
public native final void setDataSource(DataSource source) throws IOException;
/**
* Sets the data source as a content Uri.
*
* @param context the Context to use when resolving the Uri
* @param uri the Content URI of the data you want to extract from.
* @param headers the headers to be sent together with the request for the data
*/
public final void setDataSource(
Context context, Uri uri, Map<String, String> headers)
throws IOException {
String scheme = uri.getScheme();
if(scheme == null || scheme.equals("file")) {
setDataSource(uri.getPath());
return;
}
AssetFileDescriptor fd = null;
try {
ContentResolver resolver = context.getContentResolver();
fd = resolver.openAssetFileDescriptor(uri, "r");
if (fd == null) {
return;
}
// Note: using getDeclaredLength so that our behavior is the same
// as previous versions when the content provider is returning
// a full file.
if (fd.getDeclaredLength() < 0) {
setDataSource(fd.getFileDescriptor());
} else {
setDataSource(
fd.getFileDescriptor(),
fd.getStartOffset(),
fd.getDeclaredLength());
}
return;
} catch (SecurityException ex) {
} catch (IOException ex) {
} finally {
if (fd != null) {
fd.close();
}
}
setDataSource(uri.toString(), headers);
}
/**
* Sets the data source (file-path or http URL) to use.
*
* @param path the path of the file, or the http URL
* @param headers the headers associated with the http request for the stream you want to play
*/
public final void setDataSource(String path, Map<String, String> headers)
throws IOException {
String[] keys = null;
String[] values = null;
if (headers != null) {
keys = new String[headers.size()];
values = new String[headers.size()];
int i = 0;
for (Map.Entry<String, String> entry: headers.entrySet()) {
keys[i] = entry.getKey();
values[i] = entry.getValue();
++i;
}
}
nativeSetDataSource(
MediaHTTPService.createHttpServiceBinderIfNecessary(path),
path,
keys,
values);
}
private native final void nativeSetDataSource(
IBinder httpServiceBinder,
String path,
String[] keys,
String[] values) throws IOException;
/**
* Sets the data source (file-path or http URL) to use.
*
* @param path the path of the file, or the http URL of the stream
*
* <p>When <code>path</code> refers to a local file, the file may actually be opened by a
* process other than the calling application. This implies that the pathname
* should be an absolute path (as any other process runs with unspecified current working
* directory), and that the pathname should reference a world-readable file.
* As an alternative, the application could first open the file for reading,
* and then use the file descriptor form {@link #setDataSource(FileDescriptor)}.
*/
public final void setDataSource(String path) throws IOException {
nativeSetDataSource(
MediaHTTPService.createHttpServiceBinderIfNecessary(path),
path,
null,
null);
}
/**
* Sets the data source (FileDescriptor) to use. It is the caller's responsibility
* to close the file descriptor. It is safe to do so as soon as this call returns.
*
* @param fd the FileDescriptor for the file you want to extract from.
*/
public final void setDataSource(FileDescriptor fd) throws IOException {
setDataSource(fd, 0, 0x7ffffffffffffffL);
}
/**
* Sets the data source (FileDescriptor) to use. The FileDescriptor must be
* seekable (N.B. a LocalSocket is not seekable). It is the caller's responsibility
* to close the file descriptor. It is safe to do so as soon as this call returns.
*
* @param fd the FileDescriptor for the file you want to extract from.
* @param offset the offset into the file where the data to be extracted starts, in bytes
* @param length the length in bytes of the data to be extracted
*/
public native final void setDataSource(
FileDescriptor fd, long offset, long length) throws IOException;
@Override
protected void finalize() {
native_finalize();
}
/**
* Make sure you call this when you're done to free up any resources
* instead of relying on the garbage collector to do this for you at
* some point in the future.
*/
public native final void release();
/**
* Count the number of tracks found in the data source.
*/
public native final int getTrackCount();
/**
* Get the PSSH info if present.
* @return a map of uuid-to-bytes, with the uuid specifying
* the crypto scheme, and the bytes being the data specific to that scheme.
*/
public Map<UUID, byte[]> getPsshInfo() {
Map<UUID, byte[]> psshMap = null;
Map<String, Object> formatMap = getFileFormatNative();
if (formatMap != null && formatMap.containsKey("pssh")) {
ByteBuffer rawpssh = (ByteBuffer) formatMap.get("pssh");
rawpssh.order(ByteOrder.nativeOrder());
rawpssh.rewind();
formatMap.remove("pssh");
// parse the flat pssh bytebuffer into something more manageable
psshMap = new HashMap<UUID, byte[]>();
while (rawpssh.remaining() > 0) {
rawpssh.order(ByteOrder.BIG_ENDIAN);
long msb = rawpssh.getLong();
long lsb = rawpssh.getLong();
UUID uuid = new UUID(msb, lsb);
rawpssh.order(ByteOrder.nativeOrder());
int datalen = rawpssh.getInt();
byte [] psshdata = new byte[datalen];
rawpssh.get(psshdata);
psshMap.put(uuid, psshdata);
}
}
return psshMap;
}
private native Map<String, Object> getFileFormatNative();
/**
* Get the track format at the specified index.
* More detail on the representation can be found at {@link android.media.MediaCodec}
*/
public MediaFormat getTrackFormat(int index) {
return new MediaFormat(getTrackFormatNative(index));
}
private native Map<String, Object> getTrackFormatNative(int index);
/**
* Subsequent calls to {@link #readSampleData}, {@link #getSampleTrackIndex} and
* {@link #getSampleTime} only retrieve information for the subset of tracks
* selected.
* Selecting the same track multiple times has no effect, the track is
* only selected once.
*/
public native void selectTrack(int index);
/**
* Subsequent calls to {@link #readSampleData}, {@link #getSampleTrackIndex} and
* {@link #getSampleTime} only retrieve information for the subset of tracks
* selected.
*/
public native void unselectTrack(int index);
/**
* If possible, seek to a sync sample at or before the specified time
*/
public static final int SEEK_TO_PREVIOUS_SYNC = 0;
/**
* If possible, seek to a sync sample at or after the specified time
*/
public static final int SEEK_TO_NEXT_SYNC = 1;
/**
* If possible, seek to the sync sample closest to the specified time
*/
public static final int SEEK_TO_CLOSEST_SYNC = 2;
/**
* All selected tracks seek near the requested time according to the
* specified mode.
*/
public native void seekTo(long timeUs, int mode);
/**
* Advance to the next sample. Returns false if no more sample data
* is available (end of stream).
*/
public native boolean advance();
/**
* Retrieve the current encoded sample and store it in the byte buffer
* starting at the given offset.
* <p>
* <b>Note:</b>As of API 21, on success the position and limit of
* {@code byteBuf} is updated to point to the data just read.
* @param byteBuf the destination byte buffer
* @return the sample size (or -1 if no more samples are available).
*/
public native int readSampleData(ByteBuffer byteBuf, int offset);
/**
* Returns the track index the current sample originates from (or -1
* if no more samples are available)
*/
public native int getSampleTrackIndex();
/**
* Returns the current sample's presentation time in microseconds.
* or -1 if no more samples are available.
*/
public native long getSampleTime();
// Keep these in sync with their equivalents in NuMediaExtractor.h
/**
* The sample is a sync sample (or in {@link MediaCodec}'s terminology
* it is a key frame.)
*
* @see MediaCodec#BUFFER_FLAG_KEY_FRAME
*/
public static final int SAMPLE_FLAG_SYNC = 1;
/**
* The sample is (at least partially) encrypted, see also the documentation
* for {@link android.media.MediaCodec#queueSecureInputBuffer}
*/
public static final int SAMPLE_FLAG_ENCRYPTED = 2;
/**
* Returns the current sample's flags.
*/
public native int getSampleFlags();
/**
* If the sample flags indicate that the current sample is at least
* partially encrypted, this call returns relevant information about
* the structure of the sample data required for decryption.
* @param info The android.media.MediaCodec.CryptoInfo structure
* to be filled in.
* @return true iff the sample flags contain {@link #SAMPLE_FLAG_ENCRYPTED}
*/
public native boolean getSampleCryptoInfo(MediaCodec.CryptoInfo info);
/**
* Returns an estimate of how much data is presently cached in memory
* expressed in microseconds. Returns -1 if that information is unavailable
* or not applicable (no cache).
*/
public native long getCachedDuration();
/**
* Returns true iff we are caching data and the cache has reached the
* end of the data stream (for now, a future seek may of course restart
* the fetching of data).
* This API only returns a meaningful result if {@link #getCachedDuration}
* indicates the presence of a cache, i.e. does NOT return -1.
*/
public native boolean hasCacheReachedEndOfStream();
private static native final void native_init();
private native final void native_setup();
private native final void native_finalize();
static {
System.loadLibrary("media_jni");
native_init();
}
private long mNativeContext;
}
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