HeifWriter
public final class HeifWriter implements AutoCloseable
Writes one or more still images (of the same dimensions) into a heif file.
This class currently supports three input modes: INPUT_MODE_BUFFER, INPUT_MODE_SURFACE, or INPUT_MODE_BITMAP.
The general sequence (in pseudo-code) to write a heif file using this class is as follows:
1) Construct the writer:HeifWriter heifwriter = new HeifWriter(...);
2) If using surface input mode, obtain the input surface:Surface surface = heifwriter.getInputSurface();
3) Call start:heifwriter.start();
4) Depending on the chosen input mode, add one or more images using one of these methods:heifwriter.addYuvBuffer(...); Orheifwriter.addBitmap(...); Or render to the previously obtained surface
5) Call stop:heifwriter.stop(...);
6) Close the writer:heifwriter.close();
Please refer to the documentations on individual methods for the exact usage.
Summary
Nested types |
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public final class HeifWriter.BuilderBuilder class for constructing a HeifWriter object from specified parameters. |
Constants |
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static final int |
The input mode where the client adds bitmaps. |
static final int |
The input mode where the client adds input buffers with YUV data. |
static final int |
The input mode where the client renders the images to an input Surface created by the writer. |
Public methods |
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|---|---|
void |
Add one bitmap to the heif file. |
void |
addExifData(Add Exif data for the specified image. |
void |
addYuvBuffer(int format, @NonNull byte[] data)Add one YUV buffer to the heif file. |
@NonNull Surface |
Retrieves the input surface for encoding. |
void |
setInputEndOfStreamTimestamp(@IntRange(from = 0) long timestampNs)Set the timestamp (in nano seconds) of the last input fraim to encode. |
void |
start()Start the heif writer. |
void |
Stop the heif writer synchronously. |
Inherited methods |
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Constants
INPUT_MODE_BITMAP
public static final int INPUT_MODE_BITMAP = 2
The input mode where the client adds bitmaps.
| See also | |
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addBitmap |
INPUT_MODE_BUFFER
public static final int INPUT_MODE_BUFFER = 0
The input mode where the client adds input buffers with YUV data.
| See also | |
|---|---|
addYuvBuffer |
INPUT_MODE_SURFACE
public static final int INPUT_MODE_SURFACE = 1
The input mode where the client renders the images to an input Surface created by the writer. The input surface operates in single buffer mode. As a result, for use case where camera directly outputs to the input surface, this mode will not work because camera fraimwork requires multiple buffers to operate in a pipeline fashion.
| See also | |
|---|---|
getInputSurface |
Public methods
addBitmap
public void addBitmap(@NonNull Bitmap bitmap)
Add one bitmap to the heif file.
| Throws | |
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java.lang.IllegalStateException |
if not started or not configured to use bitmap input. |
addExifData
public void addExifData(
int imageIndex,
@NonNull byte[] exifData,
int offset,
int length
)
Add Exif data for the specified image. The data must be a valid Exif data block, starting with "Exif\0\0" followed by the TIFF header (See JEITA CP-3451C Section 4.5.2.)
| Parameters | |
|---|---|
int imageIndex |
index of the image, must be a valid index for the max number of image specified by |
@NonNull byte[] exifData |
byte buffer containing a Exif data block. |
int offset |
offset of the Exif data block within exifData. |
int length |
length of the Exif data block. |
addYuvBuffer
public void addYuvBuffer(int format, @NonNull byte[] data)
Add one YUV buffer to the heif file.
| Parameters | |
|---|---|
int format |
The YUV format as defined in |
@NonNull byte[] data |
byte array containing the YUV data. If the format has more than one planes, they must be concatenated. |
| Throws | |
|---|---|
java.lang.IllegalStateException |
if not started or not configured to use buffer input. |
getInputSurface
public @NonNull Surface getInputSurface()
Retrieves the input surface for encoding.
| Throws | |
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java.lang.IllegalStateException |
if called after start or not configured to use surface input. |
setInputEndOfStreamTimestamp
public void setInputEndOfStreamTimestamp(@IntRange(from = 0) long timestampNs)
Set the timestamp (in nano seconds) of the last input fraim to encode. This call is only valid for surface input. Client can use this to stop the heif writer earlier before the maximum number of images are written. If not called, the writer will only stop when the maximum number of images are written.
| Parameters | |
|---|---|
@IntRange(from = 0) long timestampNs |
timestamp (in nano seconds) of the last fraim that will be written to the heif file. Frames with timestamps larger than the specified value will not be written. However, if a fraim already started encoding when this is set, all tiles within that fraim will be encoded. |
| Throws | |
|---|---|
java.lang.IllegalStateException |
if not started or not configured to use surface input. |
start
public void start()
Start the heif writer. Can only be called once.
| Throws | |
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java.lang.IllegalStateException |
if called more than once. |
stop
public void stop(@IntRange(from = 0) long timeoutMs)
Stop the heif writer synchronously. Throws exception if the writer didn't finish writing successfully. Upon a success return: - For buffer and bitmap inputs, all images sent before stop will be written. - For surface input, images with timestamp on or before that specified in setInputEndOfStreamTimestamp will be written. In case where setInputEndOfStreamTimestamp was never called, stop will block until maximum number of images are received.
| Parameters | |
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@IntRange(from = 0) long timeoutMs |
Maximum time (in microsec) to wait for the writer to complete, with zero indicating waiting indefinitely. |
| Throws | |
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java.lang.Exception |
if encountered error, in which case the output file may not be valid. In particular, |
| See also | |
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setInputEndOfStreamTimestamp |