tv.danmaku.ijk.media.drm.upstream

类 DataSpec

java.lang.Object

tv.danmaku.ijk.media.drm.upstream.DataSpec

public final class DataSpec
extends java.lang.Object

Defines a region of data in a resource.

嵌套类概要

嵌套类

限定符和类型	类和说明
static class	DataSpec.Builder Builds DataSpec instances.
static interface	DataSpec.Flags The flags that apply to any request for data.
static interface	DataSpec.HttpMethod HTTP methods supported by ExoPlayer HttpDataSources.

字段概要

字段

限定符和类型	字段和说明
long	absoluteStreamPosition 已过时。 Use position except for specific use cases where the absolute position within the resource is required within a DataSource chain. Where the absolute position is required, use uriPositionOffset + position.
java.lang.Object	customData Application specific data.
static int	FLAG_ALLOW_CACHE_FRAGMENTATION Allows fragmentation of this request into multiple cache files, meaning a cache eviction policy will be able to evict individual fragments of the data.
static int	FLAG_ALLOW_GZIP Allows an underlying network stack to request that the server use gzip compression.
static int	FLAG_DONT_CACHE_IF_LENGTH_UNKNOWN Prevents caching if the length cannot be resolved when the DataSource is opened.
static int	FLAG_MIGHT_NOT_USE_FULL_NETWORK_SPEED Indicates there are known external factors that might prevent the data from being loaded at full network speed (e.g. server throttling or unfinished live media chunks).
int	flags Request flags.
static int	HTTP_METHOD_GET HTTP GET method.
static int	HTTP_METHOD_HEAD HTTP HEAD method.
static int	HTTP_METHOD_POST HTTP POST method.
byte[]	httpBody The HTTP request body, null otherwise.
int	httpMethod The HTTP method to use when requesting the data.
java.util.Map<java.lang.String,java.lang.String>	httpRequestHeaders Additional HTTP headers to use when requesting the data.
java.lang.String	key A key that uniquely identifies the resource.
long	length The length of the data, or C.LENGTH_UNSET.
long	position The position of the data when read from uri.
android.net.Uri	uri A Uri from which data belonging to the resource can be read.
long	uriPositionOffset The offset of the data located at uri within the resource.

构造器概要

构造器

构造器和说明
DataSpec(android.net.Uri uri) Constructs an instance.
DataSpec(android.net.Uri uri, byte[] postBody, long absoluteStreamPosition, long position, long length, java.lang.String key, int flags) 已过时。 Use DataSpec.Builder. Note that the httpMethod must be set explicitly for the Builder.
DataSpec(android.net.Uri uri, int flags) 已过时。 Use DataSpec.Builder.
DataSpec(android.net.Uri uri, int httpMethod, byte[] httpBody, long absoluteStreamPosition, long position, long length, java.lang.String key, int flags) 已过时。 Use DataSpec.Builder.
DataSpec(android.net.Uri uri, int httpMethod, byte[] httpBody, long absoluteStreamPosition, long position, long length, java.lang.String key, int flags, java.util.Map<java.lang.String,java.lang.String> httpRequestHeaders) 已过时。 Use DataSpec.Builder.
DataSpec(android.net.Uri uri, long position, long length) Constructs an instance.
DataSpec(android.net.Uri uri, long absoluteStreamPosition, long position, long length, java.lang.String key, int flags) 已过时。 Use DataSpec.Builder.
DataSpec(android.net.Uri uri, long position, long length, java.lang.String key) 已过时。 Use DataSpec.Builder.
DataSpec(android.net.Uri uri, long position, long length, java.lang.String key, int flags) 已过时。 Use DataSpec.Builder.
DataSpec(android.net.Uri uri, long position, long length, java.lang.String key, int flags, java.util.Map<java.lang.String,java.lang.String> httpRequestHeaders) 已过时。 Use DataSpec.Builder.

方法概要

限定符和类型	方法和说明
DataSpec.Builder	buildUpon() Returns a DataSpec.Builder initialized with the values of this instance.
java.lang.String	getHttpMethodString() Returns the uppercase HTTP method name (e.g., "GET", "POST", "HEAD") corresponding to the httpMethod.
static java.lang.String	getStringForHttpMethod(int httpMethod) Returns an uppercase HTTP method name (e.g., "GET", "POST", "HEAD") corresponding to the given DataSpec.HttpMethod.
boolean	isFlagSet(int flag) Returns whether the given flag is set.
DataSpec	subrange(long offset) Returns a data spec that represents a subrange of the data defined by this DataSpec.
DataSpec	subrange(long offset, long length) Returns a data spec that represents a subrange of the data defined by this DataSpec.
java.lang.String	toString()
DataSpec	withAdditionalHeaders(java.util.Map<java.lang.String,java.lang.String> additionalHttpRequestHeaders) Returns a copy this data spec with additional HTTP request headers.
DataSpec	withRequestHeaders(java.util.Map<java.lang.String,java.lang.String> httpRequestHeaders) Returns a copy of this data spec with the specified HTTP request headers.
DataSpec	withUri(android.net.Uri uri) Returns a copy of this data spec with the specified Uri.

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

字段详细资料

FLAG_ALLOW_GZIP

public static final int FLAG_ALLOW_GZIP

Allows an underlying network stack to request that the server use gzip compression.

Should not typically be set if the data being requested is already compressed (e.g. most audio and video requests). May be set when requesting other data.

When a DataSource is used to request data with this flag set, and if the DataSource does make a network request, then the value returned from DataSource.open(DataSpec) will typically be C.LENGTH_UNSET. The data read from DataReader.read(byte[], int, int) will be the decompressed data.

另请参阅:

常量字段值

FLAG_DONT_CACHE_IF_LENGTH_UNKNOWN

public static final int FLAG_DONT_CACHE_IF_LENGTH_UNKNOWN

Prevents caching if the length cannot be resolved when the DataSource is opened.

另请参阅:

常量字段值

FLAG_ALLOW_CACHE_FRAGMENTATION

public static final int FLAG_ALLOW_CACHE_FRAGMENTATION

Allows fragmentation of this request into multiple cache files, meaning a cache eviction policy will be able to evict individual fragments of the data. Depending on the cache implementation, setting this flag may also enable more concurrent access to the data (e.g. reading one fragment whilst writing another).

另请参阅:

常量字段值

FLAG_MIGHT_NOT_USE_FULL_NETWORK_SPEED

public static final int FLAG_MIGHT_NOT_USE_FULL_NETWORK_SPEED

Indicates there are known external factors that might prevent the data from being loaded at full network speed (e.g. server throttling or unfinished live media chunks).

另请参阅:

常量字段值

HTTP_METHOD_GET

public static final int HTTP_METHOD_GET

HTTP GET method.

另请参阅:

常量字段值

HTTP_METHOD_POST

public static final int HTTP_METHOD_POST

HTTP POST method.

另请参阅:

常量字段值

HTTP_METHOD_HEAD

public static final int HTTP_METHOD_HEAD

HTTP HEAD method.

另请参阅:

常量字段值

uri

public final android.net.Uri uri

A Uri from which data belonging to the resource can be read.

uriPositionOffset

public final long uriPositionOffset

The offset of the data located at uri within the resource.

Equal to 0 unless uri provides access to a subset of the resource. As an example, consider a resource that can be requested over the network and is 1000 bytes long. If uri points to a local file that contains just bytes [200-300], then this field will be set to 200.

This field can be ignored except for in specific circumstances where the absolute position in the resource is required in a DataSource chain. One example is when a DataSource needs to decrypt the content as it's read. In this case the absolute position in the resource is typically needed to correctly initialize the decryption algorithm.

httpMethod

@DataSpec.HttpMethod
public final int httpMethod

The HTTP method to use when requesting the data. This value will be ignored by non-HTTP DataSource implementations.

httpBody

public final byte[] httpBody

The HTTP request body, null otherwise. If the body is non-null, then httpBody.length will be non-zero.

httpRequestHeaders

public final java.util.Map<java.lang.String,java.lang.String> httpRequestHeaders

Additional HTTP headers to use when requesting the data.

Note: This map is for additional headers specific to the data being requested. It does not include headers that are set directly by HttpDataSource implementations. In particular, this means the following headers are not included:

• Range: HttpDataSource implementations derive the Range header from position and length.
• Accept-Encoding: HttpDataSource implementations derive the Accept-Encoding header based on whether flags includes FLAG_ALLOW_GZIP.
• User-Agent: HttpDataSource implementations set the User-Agent header directly.
• Other headers set at the HttpDataSource layer. I.e., headers set using HttpDataSource.setRequestProperty(String, String), and using HttpDataSource.Factory.setDefaultRequestProperties(Map).

absoluteStreamPosition

@Deprecated
public final long absoluteStreamPosition

已过时。 Use position except for specific use cases where the absolute position within the resource is required within a DataSource chain. Where the absolute position is required, use uriPositionOffset + position.

The absolute position of the data in the resource.

position

public final long position

The position of the data when read from uri.

length

public final long length

The length of the data, or C.LENGTH_UNSET.

key

public final java.lang.String key

A key that uniquely identifies the resource. Used for cache indexing. May be null if the data spec is not intended to be used in conjunction with a cache.

flags

@DataSpec.Flags
public final int flags

Request flags.

customData

public final java.lang.Object customData

Application specific data.

This field is intended for advanced use cases in which applications require the ability to attach custom data to DataSpec instances. The custom data should be immutable.

构造器详细资料

DataSpec

public DataSpec(android.net.Uri uri)

Constructs an instance.

参数:

uri - uri.

DataSpec

public DataSpec(android.net.Uri uri,
                long position,
                long length)

Constructs an instance.

参数:

uri - uri.

position - position.

length - length.

DataSpec

@Deprecated
public DataSpec(android.net.Uri uri,
                             @DataSpec.Flags
                             int flags)

已过时。 Use DataSpec.Builder.

Constructs an instance.

参数:

uri - uri.

flags - flags.

DataSpec

@Deprecated
public DataSpec(android.net.Uri uri,
                             long position,
                             long length,
                             java.lang.String key)

已过时。 Use DataSpec.Builder.

Constructs an instance.

参数:

uri - uri.

position - position.

length - length.

key - key.

DataSpec

@Deprecated
public DataSpec(android.net.Uri uri,
                             long position,
                             long length,
                             java.lang.String key,
                             @DataSpec.Flags
                             int flags)

已过时。 Use DataSpec.Builder.

Constructs an instance.

参数:

uri - uri.

position - position.

length - length.

key - key.

flags - flags.

DataSpec

@Deprecated
public DataSpec(android.net.Uri uri,
                             long position,
                             long length,
                             java.lang.String key,
                             @DataSpec.Flags
                             int flags,
                             java.util.Map<java.lang.String,java.lang.String> httpRequestHeaders)

已过时。 Use DataSpec.Builder.

Constructs an instance.

参数:

uri - uri.

position - position, equal to position.

length - length.

key - key.

flags - flags.

httpRequestHeaders - httpRequestHeaders

DataSpec

@Deprecated
public DataSpec(android.net.Uri uri,
                             long absoluteStreamPosition,
                             long position,
                             long length,
                             java.lang.String key,
                             @DataSpec.Flags
                             int flags)

已过时。 Use DataSpec.Builder.

Constructs an instance where uriPositionOffset may be non-zero.

参数:

uri - uri.

absoluteStreamPosition - The sum of uriPositionOffset and position.

position - position.

length - length.

key - key.

flags - flags.

DataSpec

@Deprecated
public DataSpec(android.net.Uri uri,
                             byte[] postBody,
                             long absoluteStreamPosition,
                             long position,
                             long length,
                             java.lang.String key,
                             @DataSpec.Flags
                             int flags)

已过时。 Use DataSpec.Builder. Note that the httpMethod must be set explicitly for the Builder.

Construct a instance where uriPositionOffset may be non-zero. The httpMethod is inferred from postBody. If postBody is non-null then httpMethod is set to HTTP_METHOD_POST. If postBody is null then httpMethod is set to HTTP_METHOD_GET.

参数:

uri - uri.

postBody - httpBody The body of the HTTP request, which is also used to infer the httpMethod.

absoluteStreamPosition - The sum of uriPositionOffset and position.

position - position.

length - length.

key - key.

flags - flags.

DataSpec

@Deprecated
public DataSpec(android.net.Uri uri,
                             @DataSpec.HttpMethod
                             int httpMethod,
                             byte[] httpBody,
                             long absoluteStreamPosition,
                             long position,
                             long length,
                             java.lang.String key,
                             @DataSpec.Flags
                             int flags)

已过时。 Use DataSpec.Builder.

Construct a instance where uriPositionOffset may be non-zero.

参数:

uri - uri.

httpMethod - httpMethod.

httpBody - httpBody.

absoluteStreamPosition - The sum of uriPositionOffset and position.

position - position.

length - length.

key - key.

flags - flags.

DataSpec

@Deprecated
public DataSpec(android.net.Uri uri,
                             @DataSpec.HttpMethod
                             int httpMethod,
                             byte[] httpBody,
                             long absoluteStreamPosition,
                             long position,
                             long length,
                             java.lang.String key,
                             @DataSpec.Flags
                             int flags,
                             java.util.Map<java.lang.String,java.lang.String> httpRequestHeaders)

已过时。 Use DataSpec.Builder.

Construct a instance where uriPositionOffset may be non-zero.

参数:

uri - uri.

httpMethod - httpMethod.

httpBody - httpBody.

absoluteStreamPosition - The sum of uriPositionOffset and position.

position - position.

length - length.

key - key.

flags - flags.

httpRequestHeaders - httpRequestHeaders.

方法详细资料

getStringForHttpMethod

public static java.lang.String getStringForHttpMethod(@DataSpec.HttpMethod
                                                      int httpMethod)

Returns an uppercase HTTP method name (e.g., "GET", "POST", "HEAD") corresponding to the given DataSpec.HttpMethod.

isFlagSet

public boolean isFlagSet(@DataSpec.Flags
                         int flag)

Returns whether the given flag is set.

参数:

flag - Flag to be checked if it is set.

getHttpMethodString

public final java.lang.String getHttpMethodString()

Returns the uppercase HTTP method name (e.g., "GET", "POST", "HEAD") corresponding to the httpMethod.

buildUpon

public DataSpec.Builder buildUpon()

Returns a DataSpec.Builder initialized with the values of this instance.

subrange

public DataSpec subrange(long offset)

Returns a data spec that represents a subrange of the data defined by this DataSpec. The subrange includes data from the offset up to the end of this DataSpec.

参数:

offset - The offset of the subrange.

返回:

A data spec that represents a subrange of the data defined by this DataSpec.

subrange

public DataSpec subrange(long offset,
                         long length)

Returns a data spec that represents a subrange of the data defined by this DataSpec.

参数:

offset - The offset of the subrange.

length - The length of the subrange.

返回:

A data spec that represents a subrange of the data defined by this DataSpec.

withUri

public DataSpec withUri(android.net.Uri uri)

Returns a copy of this data spec with the specified Uri.

参数:

uri - The new source Uri.

返回:

The copied data spec with the specified Uri.

withRequestHeaders

public DataSpec withRequestHeaders(java.util.Map<java.lang.String,java.lang.String> httpRequestHeaders)

Returns a copy of this data spec with the specified HTTP request headers. Headers already in the data spec are not copied to the new instance.

参数:

httpRequestHeaders - The HTTP request headers.

返回:

The copied data spec with the specified HTTP request headers.

withAdditionalHeaders

public DataSpec withAdditionalHeaders(java.util.Map<java.lang.String,java.lang.String> additionalHttpRequestHeaders)

Returns a copy this data spec with additional HTTP request headers. Headers in additionalHttpRequestHeaders will overwrite any headers already in the data spec that have the same keys.

参数:

additionalHttpRequestHeaders - The additional HTTP request headers.

返回:

The copied data spec with the additional HTTP request headers.

toString

public java.lang.String toString()

覆盖:

toString 在类中 java.lang.Object