LinearBlock
class LinearBlock
| kotlin.Any | |
| ↳ | android.media.MediaCodec.LinearBlock |
Section of memory that represents a linear block. Applications may acquire a block via LinearBlock.obtain and queue all or part of the block as an input buffer to a codec, or get a block allocated by codec as an output buffer from OutputFrame. {@see QueueRequest#setLinearBlock} {@see QueueRequest#setEncryptedLinearBlock} {@see OutputFrame#getLinearBlock}
Summary
| Public methods | |
|---|---|
| static Boolean |
isCodecCopyFreeCompatible(codecNames: Array<String!>)Returns true if it is possible to allocate a linear block that can be passed to all listed codecs as input buffers without copying the content. |
| Boolean |
Returns true if the buffer is mappable. |
| ByteBuffer |
map()Map the memory and return the mapped region. |
| static MediaCodec.LinearBlock? |
Obtain a linear block object no smaller than |
| Unit |
recycle()Mark this block as ready to be recycled by the framework once it is no longer in use. |
| Protected methods | |
|---|---|
| Unit |
finalize() |
Public methods
isCodecCopyFreeCompatible
static fun isCodecCopyFreeCompatible(codecNames: Array<String!>): Boolean
Returns true if it is possible to allocate a linear block that can be passed to all listed codecs as input buffers without copying the content.
Note that even if this function returns true, obtain may still throw due to invalid arguments or allocation failure.
| Parameters | |
|---|---|
codecNames |
Array<String!>: list of codecs that the client wants to use a linear block without copying. Null entries are ignored. This value cannot be null. |
isMappable
fun isMappable(): Boolean
Returns true if the buffer is mappable.
| Exceptions | |
|---|---|
java.lang.IllegalStateException |
if invalid |
map
fun map(): ByteBuffer
Map the memory and return the mapped region.
The returned memory region becomes inaccessible after recycle, or the buffer is queued to the codecs and not returned to the client yet.
| Return | |
|---|---|
ByteBuffer |
mapped memory region as ByteBuffer object This value cannot be null. |
| Exceptions | |
|---|---|
java.lang.IllegalStateException |
if not mappable or invalid |
obtain
static fun obtain(
capacity: Int,
codecNames: Array<String!>
): MediaCodec.LinearBlock?
Obtain a linear block object no smaller than capacity. If isCodecCopyFreeCompatible with the same codecNames returned true, the returned LinearBlock object can be queued to the listed codecs without copying. The returned LinearBlock object is always read/write mappable.
| Parameters | |
|---|---|
capacity |
Int: requested capacity of the linear block in bytes |
codecNames |
Array<String!>: list of codecs that the client wants to use this linear block without copying. Null entries are ignored. This value cannot be null. |
| Return | |
|---|---|
MediaCodec.LinearBlock? |
a linear block object. This value may be null. |
| Exceptions | |
|---|---|
java.lang.IllegalArgumentException |
if the capacity is invalid or codecNames contains invalid name |
java.io.IOException |
if an error occurred while allocating a buffer |
recycle
fun recycle(): Unit
Mark this block as ready to be recycled by the framework once it is no longer in use. All operations to this object after this call will cause exceptions, as well as attempt to access the previously mapped memory region. Caller should clear all references to this object after this call.
To avoid excessive memory consumption, it is recommended that callers recycle buffers as soon as they no longer need the buffers
| Exceptions | |
|---|---|
java.lang.IllegalStateException |
if invalid |
Protected methods
finalize
protected fun finalize(): Unit
| Exceptions | |
|---|---|
java.lang.Throwable |
the Exception raised by this method |