xufulong
3 years ago
parent
cc0eb0a8f3
commit
6ba160954a
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package com.frank.ffmpeg.metadata; |
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import android.content.ContentResolver; |
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import android.content.Context; |
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import android.content.res.AssetFileDescriptor; |
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import android.graphics.Bitmap; |
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import android.graphics.BitmapFactory; |
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import android.net.Uri; |
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import android.util.Log; |
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import java.io.FileDescriptor; |
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import java.io.FileNotFoundException; |
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import java.io.IOException; |
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/** |
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* Retrieve frame and extract metadata from an input media file. |
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*/ |
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public class FFmpegMediaRetriever { |
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static { |
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try { |
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System.loadLibrary("media-handle"); |
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} catch (UnsatisfiedLinkError e) { |
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Log.e("FFmpegMediaRetriever", "loadLibrary error=" + e.toString()); |
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} |
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} |
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// The field is accessed by native method
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private long mNativeRetriever; |
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public FFmpegMediaRetriever() { |
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native_init(); |
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native_setup(); |
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} |
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public void setDataSource(String path) { |
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native_setDataSource(path); |
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} |
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/** |
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* Sets the data source (FileDescriptor) to use. It is the caller's |
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* responsibility to close the file descriptor. It is safe to do so as soon |
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* as this call returns. Call this method before the rest of the methods in |
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* this class. This method may be time-consuming. |
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* |
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* @param fd the FileDescriptor for the file you want to play |
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*/ |
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public void setDataSource(FileDescriptor fd) |
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throws IllegalArgumentException { |
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if (fd == null) { |
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return; |
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} |
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native_setDataSourceFD(fd, 0, 0x7ffffffffffffffL); |
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} |
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/** |
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* Sets the data source as a content Uri. Call this method before |
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* the rest of the methods in this class. This method may be time-consuming. |
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* |
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* @param context the Context to use when resolving the Uri |
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* @param uri the Content URI of the data you want to play |
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* |
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*/ |
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public void setDataSource(Context context, Uri uri) throws IllegalArgumentException, SecurityException { |
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if (uri == null) { |
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throw new IllegalArgumentException(); |
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} |
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String scheme = uri.getScheme(); |
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if(scheme == null || scheme.equals("file")) { |
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setDataSource(uri.getPath()); |
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return; |
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} |
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AssetFileDescriptor fd = null; |
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try { |
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ContentResolver resolver = context.getContentResolver(); |
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try { |
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fd = resolver.openAssetFileDescriptor(uri, "r"); |
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} catch(FileNotFoundException e) { |
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throw new IllegalArgumentException(); |
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} |
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if (fd == null) { |
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throw new IllegalArgumentException(); |
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} |
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FileDescriptor descriptor = fd.getFileDescriptor(); |
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if (!descriptor.valid()) { |
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throw new IllegalArgumentException(); |
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} |
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if (fd.getDeclaredLength() < 0) { |
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setDataSource(descriptor); |
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} else { |
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native_setDataSourceFD(descriptor, fd.getStartOffset(), fd.getDeclaredLength()); |
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} |
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return; |
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} catch (SecurityException ex) { |
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ex.printStackTrace(); |
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} finally { |
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try { |
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if (fd != null) { |
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fd.close(); |
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} |
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} catch(IOException ioEx) { |
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ioEx.printStackTrace(); |
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} |
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} |
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setDataSource(uri.toString()); |
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} |
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public String extractMetadata(String key) { |
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if (key == null || key.isEmpty()) { |
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return null; |
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} |
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return native_extractMetadata(key); |
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} |
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/** |
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* Call this method after setDataSource(). This method finds a |
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* representative frame close to the given time position by considering |
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* the given option if possible, and returns it as a bitmap. This is |
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* useful for generating a thumbnail for an input data source or just |
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* obtain and display a frame at the given time position. |
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* |
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* @param timeUs The time position where the frame will be retrieved. |
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* |
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* @param option a hint on how the frame is found. Use |
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* {@link #OPTION_PREVIOUS_SYNC} if one wants to retrieve a sync frame |
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* that has a timestamp earlier than or the same as timeUs. Use |
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* {@link #OPTION_NEXT_SYNC} if one wants to retrieve a sync frame |
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* that has a timestamp later than or the same as timeUs. Use |
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* {@link #OPTION_CLOSEST_SYNC} if one wants to retrieve a sync frame |
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* that has a timestamp closest to or the same as timeUs. Use |
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* {@link #OPTION_CLOSEST} if one wants to retrieve a frame that may |
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* or may not be a sync frame but is closest to or the same as timeUs. |
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* {@link #OPTION_CLOSEST} often has larger performance overhead compared |
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* to the other options if there is no sync frame located at timeUs. |
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* |
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* @return A Bitmap containing a representative video frame, which |
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* can be null, if such a frame cannot be retrieved. |
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*/ |
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public Bitmap getFrameAtTime(long timeUs, int option) { |
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if (option < OPTION_PREVIOUS_SYNC || |
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option > OPTION_CLOSEST) { |
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throw new IllegalArgumentException("Unsupported option: " + option); |
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} |
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BitmapFactory.Options bitmapOptions= new BitmapFactory.Options(); |
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bitmapOptions.inScaled = true; |
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byte [] picture = native_getFrameAtTime(timeUs, option); |
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if (picture != null) { |
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return BitmapFactory.decodeByteArray(picture, 0, picture.length, bitmapOptions); |
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} |
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return null; |
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} |
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public Bitmap getFrameAtTime(long timeUs) { |
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return getFrameAtTime(timeUs, OPTION_CLOSEST_SYNC); |
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} |
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/** |
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* Call this method after setDataSource(). This method finds a |
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* representative frame close to the given time position by considering |
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* the given option if possible, and returns it as a bitmap. This is |
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* useful for generating a thumbnail for an input data source or just |
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* obtain and display a frame at the given time position. |
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* |
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* @param timeUs The time position where the frame will be retrieved. |
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* |
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* @param option a hint on how the frame is found. Use |
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* {@link #OPTION_PREVIOUS_SYNC} if one wants to retrieve a sync frame |
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* that has a timestamp earlier than or the same as timeUs. Use |
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* {@link #OPTION_NEXT_SYNC} if one wants to retrieve a sync frame |
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* that has a timestamp later than or the same as timeUs. Use |
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* {@link #OPTION_CLOSEST_SYNC} if one wants to retrieve a sync frame |
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* that has a timestamp closest to or the same as timeUs. Use |
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* {@link #OPTION_CLOSEST} if one wants to retrieve a frame that may |
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* or may not be a sync frame but is closest to or the same as timeUs. |
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* {@link #OPTION_CLOSEST} often has larger performance overhead compared |
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* to the other options if there is no sync frame located at timeUs. |
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* |
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* @return A Bitmap containing a representative video frame, which |
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* can be null, if such a frame cannot be retrieved. |
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*/ |
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public Bitmap getScaledFrameAtTime(long timeUs, int option, int width, int height) { |
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if (option < OPTION_PREVIOUS_SYNC || |
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option > OPTION_CLOSEST) { |
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throw new IllegalArgumentException("Unsupported option: " + option); |
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} |
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BitmapFactory.Options bitmapOptions = new BitmapFactory.Options(); |
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bitmapOptions.inScaled = true; |
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byte [] picture = native_getScaleFrameAtTime(timeUs, option, width, height); |
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if (picture != null) { |
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return BitmapFactory.decodeByteArray(picture, 0, picture.length, bitmapOptions); |
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} |
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return null; |
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} |
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public Bitmap getScaledFrameAtTime(long timeUs, int width, int height) { |
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return getScaledFrameAtTime(timeUs, OPTION_CLOSEST_SYNC, width, height); |
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} |
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public void release() { |
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native_release(); |
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} |
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private native void native_setup(); |
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private native void native_init(); |
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private native void native_setDataSource(String path) throws IllegalArgumentException; |
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private native void native_setDataSourceFD(FileDescriptor fd, long offset, long length) throws IllegalArgumentException; |
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private native String native_extractMetadata(String key); |
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private native void native_setSurface(Object surface); |
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private native byte[] native_getFrameAtTime(long timeUs, int option); |
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private native byte[] native_getScaleFrameAtTime(long timeUs, int option, int width, int height); |
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private native void native_release(); |
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/** |
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* This option is used with {@link #getFrameAtTime(long, int)} to retrieve |
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* a sync (or key) frame associated with a data source that is located |
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* right before or at the given time. |
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* |
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* @see #getFrameAtTime(long, int) |
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*/ |
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int OPTION_PREVIOUS_SYNC = 0x00; |
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/** |
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* This option is used with {@link #getFrameAtTime(long, int)} to retrieve |
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* a sync (or key) frame associated with a data source that is located |
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* right after or at the given time. |
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* |
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* @see #getFrameAtTime(long, int) |
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*/ |
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int OPTION_NEXT_SYNC = 0x01; |
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/** |
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* This option is used with {@link #getFrameAtTime(long, int)} to retrieve |
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* a sync (or key) frame associated with a data source that is located |
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* closest to (in time) or at the given time. |
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* |
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* @see #getFrameAtTime(long, int) |
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*/ |
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int OPTION_CLOSEST_SYNC = 0x02; |
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/** |
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* This option is used with {@link #getFrameAtTime(long, int)} to retrieve |
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* a frame (not necessarily a key frame) associated with a data source that |
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* is located closest to or at the given time. |
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* |
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* @see #getFrameAtTime(long, int) |
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*/ |
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int OPTION_CLOSEST = 0x03; |
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/** |
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* The metadata key to retrieve the original name of the file. |
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*/ |
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public static String METADATA_KEY_FILENAME = "filename"; |
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/** |
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* The metadata key to retrieve the main language in which the work is performed, preferably |
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* in ISO 639-2 format. Multiple languages can be specified by separating them with commas. |
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*/ |
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public static String METADATA_KEY_LANGUAGE = "language"; |
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/** |
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* The metadata key to retrieve the name of the work. |
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*/ |
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public static String METADATA_KEY_TITLE = "title"; |
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/** |
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* The metadata key to retrieve the number of this work in the set, can be in form current/total. |
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*/ |
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public static String METADATA_KEY_TRACK = "track"; |
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/** |
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* The metadata key to retrieve the total bitrate of the bitrate variant that the current stream |
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* is part of. |
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*/ |
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public static String METADATA_KEY_VARIANT_BITRATE = "bitrate"; |
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/** |
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* The metadata key to retrieve the duration of the work in milliseconds. |
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*/ |
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public static String METADATA_KEY_DURATION = "duration"; |
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/** |
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* The metadata key to retrieve the audio codec of the work. |
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*/ |
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public static String METADATA_KEY_AUDIO_CODEC = "audio_codec"; |
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/** |
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* The metadata key to retrieve the video codec of the work. |
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*/ |
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public static String METADATA_KEY_VIDEO_CODEC = "video_codec"; |
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/** |
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* This key retrieves the video rotation angle in degrees, if available. |
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* The video rotation angle may be 0, 90, 180, or 270 degrees. |
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*/ |
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public static String METADATA_KEY_VIDEO_ROTATION = "rotate"; |
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/** |
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* This metadata key retrieves the average framerate (in frames/sec). |
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*/ |
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public static String METADATA_KEY_FRAMERATE = "framerate"; |
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/** |
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* The metadata key to retrieve the file size in bytes. |
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*/ |
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public static String METADATA_KEY_FILESIZE = "filesize"; |
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/** |
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* The metadata key to retrieve the video width. |
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*/ |
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public static String METADATA_KEY_VIDEO_WIDTH = "video_width"; |
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/** |
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* The metadata key to retrieve the video height. |
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*/ |
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public static String METADATA_KEY_VIDEO_HEIGHT = "video_height"; |
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/** |
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* The metadata key to retrieve the mime type. |
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*/ |
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public static String METADATA_KEY_MIME_TYPE = "mime_type"; |
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} |
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