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MultiMedia_MediaCommon.md

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# MultiMedia\_MediaCommon
## **Overview**
Provides data types and media formats required for recording and playing audio and videos.
**Since:**
1.0
**Version:**
1.0
## **Summary**
## Files

File Name	Description
format.h	Declares the media formats provided in the Format class.
media_errors.h	Declares the media_errors class to define errors that may occur during media operations.
media_info.h	Declares the media_info class and provides various audio, video, and codec types.
source.h	Declares the Source class, which is used to implement source-related operations.

## Data Structures

Data Structure Name	Description
OHOS::Media::FormatData	Represents the data format.
OHOS::Media::Format	Saves and sets media metadata, such as the media playback duration.
AudioDeviceDesc	Defines the audio Device Descriptor.
OHOS::Media::StreamCallback	Provides functions to obtain the address of a buffer memory and write the filled buffers into the playback queue. You need to implement the StreamCallback functions in a player object.
OHOS::Media::StreamSource	Provides functions related to the stream source for upper-layer applications.
OHOS::Media::Source	Provides functions to implement source-related operations.

## Enumerations

Enumeration Name	Description
OHOS::Media::FormatDataType : uint32_t { OHOS::Media::FORMAT_TYPE_NONE, OHOS::Media::FORMAT_TYPE_INT32, OHOS::Media::FORMAT_TYPE_INT64, OHOS::Media::FORMAT_TYPE_FLOAT, OHOS::Media::FORMAT_TYPE_DOUBLE, OHOS::Media::FORMAT_TYPE_STRING }	Enumerates formats.
AudioSourceType { AUDIO_SOURCE_INVALID = -1, AUDIO_SOURCE_DEFAULT = 0, AUDIO_MIC = 1, AUDIO_VOICE_UPLINK = 2, AUDIO_VOICE_DOWNLINK = 3, AUDIO_VOICE_CALL = 4, AUDIO_CAMCORDER = 5, AUDIO_VOICE_RECOGNITION = 6, AUDIO_VOICE_COMMUNICATION = 7, AUDIO_REMOTE_SUBMIX = 8, AUDIO_UNPROCESSED = 9, AUDIO_VOICE_PERFORMANCE = 10, AUDIO_ECHO_REFERENCE = 1997, AUDIO_RADIO_TUNER = 1998, AUDIO_HOTWORD = 1999, AUDIO_REMOTE_SUBMIX_EXTEND = 10007 }	Enumerates audio source types.
AudioStreamType { TYPE_DEFAULT = -1, TYPE_MEDIA = 0, TYPE_VOICE_COMMUNICATION = 1, TYPE_SYSTEM = 2, TYPE_RING = 3, TYPE_MUSIC = 4, TYPE_ALARM = 5, TYPE_NOTIFICATION = 6, TYPE_BLUETOOTH_SCO = 7, TYPE_ENFORCED_AUDIBLE = 8, TYPE_DTMF = 9, TYPE_TTS = 10, TYPE_ACCESSIBILITY = 11 }	Enumerates audio stream types.
VideoCodecFormat { VIDEO_DEFAULT = 0, H264 = 2, HEVC = 5 }	Enumerates video codec formats.
AudioCodecFormat { AUDIO_DEFAULT = 0, AAC_LC = 1, AAC_HE_V1 = 2, AAC_HE_V2 = 3, AAC_LD = 4, AAC_ELD = 5, FORMAT_BUTT }	Enumerates audio codec formats.
AudioBitWidth { BIT_WIDTH_8 = 8, BIT_WIDTH_16 = 16, BIT_WIDTH_24 = 24, BIT_WIDTH_BUTT }	Enumerates audio bit widths.
OHOS::Media::SourceType : int32_t { OHOS::Media::SourceType::SOURCE_TYPE_URI = 0, OHOS::Media::SourceType::SOURCE_TYPE_FD, OHOS::Media::SourceType::SOURCE_TYPE_STREAM }	Enumerates media source types.
OHOS::Media::StreamCallback::BufferFlags : uint32_t { OHOS::Media::StreamCallback::STREAM_FLAG_SYNCFRAME = 1, OHOS::Media::StreamCallback::STREAM_FLAG_CODECCONFIG = 2, OHOS::Media::StreamCallback::STREAM_FLAG_EOS = 4, OHOS::Media::StreamCallback::STREAM_FLAG_PARTIAL_FRAME = 8, OHOS::Media::StreamCallback::STREAM_FLAG_ENDOFFRAME = 16, OHOS::Media::StreamCallback::STREAM_FLAG_MUXER_DATA = 32 }	Enumerates buffer types of stream sources.

## Functions

Function Name	Description
OHOS::Media::FormatData::GetType () const	FormatDataType Obtains the format type.
OHOS::Media::FormatData::SetValue (int32_t val)	bool Sets a 32-bit integer.
OHOS::Media::FormatData::SetValue (int64_t val)	bool Sets a 64-bit long integer.
OHOS::Media::FormatData::SetValue (float val)	bool Sets a single-precision floating-point number.
OHOS::Media::FormatData::SetValue (double val)	bool Sets a double-precision floating-point number.
OHOS::Media::FormatData::SetValue (const std::string &val)	bool Sets a string.
OHOS::Media::FormatData::GetInt32Value (int32_t &val) const	bool Obtains a 32-bit integer.
OHOS::Media::FormatData::GetInt64Value (int64_t &val) const	bool Obtains a long integer.
OHOS::Media::FormatData::GetFloatValue (float &val) const	bool Obtains a single-precision floating-point number.
OHOS::Media::FormatData::GetDoubleValue (double &val) const	bool Obtains a double-precision floating-point number.
OHOS::Media::FormatData::GetStringValue (std::string &val) const	bool Obtains a string.
OHOS::Media::Format::Format ()	Default constructor of the Format instance.
OHOS::Media::Format::PutIntValue (const std::string &key, int32_t value)	bool Sets metadata of the integer type.
OHOS::Media::Format::PutLongValue (const std::string &key, int64_t value)	bool Sets metadata of the long integer type.
OHOS::Media::Format::PutFloatValue (const std::string &key, float value)	bool Sets metadata of the single-precision floating-point type.
OHOS::Media::Format::PutDoubleValue (const std::string &key, double value)	bool Sets metadata of the double-precision floating-point type.
OHOS::Media::Format::PutStringValue (const std::string &key, const std::string &value)	bool Sets metadata of the string type.
OHOS::Media::Format::GetIntValue (const std::string &key, int32_t &value) const	bool Obtains the metadata value of the integer type.
OHOS::Media::Format::GetLongValue (const std::string &key, int64_t &value) const	bool Obtains the metadata value of the long integer type.
OHOS::Media::Format::GetFloatValue (const std::string &key, float &value) const	bool Obtains the metadata value of the single-precision floating-point type.
OHOS::Media::Format::GetDoubleValue (const std::string &key, double &value) const	bool Obtains the metadata value of the double-precision floating-point type.
OHOS::Media::Format::GetStringValue (const std::string &key, std::string &value) const	bool Obtains the metadata value of the string type.
OHOS::Media::Format::GetFormatMap () const	const std::map< std::string, FormatData * > & Obtains the metadata map.
OHOS::Media::Format::CopyFrom (const Format &format)	bool Sets all metadata to a specified format.
OHOS::Media::ErrCodeOffset (unsigned int subsystem, unsigned int module=0)	constexpr ErrCode Generates a start error code with a unique identifier based on specified subsystem and module bit numbers.
OHOS::Media::StreamCallback::GetBuffer (size_t index)=0	virtual uint8_t * Obtains the virtual address of a buffer memory block based on its index.
OHOS::Media::StreamCallback::QueueBuffer (size_t index, size_t offset, size_t size, int64_t timestampUs, uint32_t flags)=0	virtual void Writes the filled buffer memory block into the player memory.
OHOS::Media::StreamCallback::SetParameters (const Format &params)=0	virtual void Sets additional information about a stream.
OHOS::Media::StreamSource::OnBufferAvailable (size_t index, size_t offset, size_t size)=0	virtual void Notifies your application of the information about the buffer memory block that can be filled with data.
OHOS::Media::StreamSource::SetStreamCallback (const std::shared_ptr< StreamCallback > &callback)=0	virtual void Sets a callback function for your application.
OHOS::Media::Source::Source (const std::string &uri)	A constructor used to create a Source instance based on a specified URI.
OHOS::Media::Source::Source (const std::string &uri, const std::map< std::string, std::string > &header)	A constructor used to create a Source instance based on a specified URI and header.
OHOS::Media::Source::Source (const std::shared_ptr< StreamSource > &stream, const Format &formats)	A constructor used to create a Source instance based on the stream source and format information.
OHOS::Media::Source::GetSourceType () const	SourceType Obtains the source type.
OHOS::Media::Source::GetSourceUri () const	const std::string & Obtains the media source URI.
OHOS::Media::Source::GetSourceHeader () const	const std::map< std::string, std::string > & Obtains the HTTP header for the media source.
OHOS::Media::Source::GetSourceStream () const	const std::shared_ptr< StreamSource > & Obtains information about the media source stream.
OHOS::Media::Source::GetSourceStreamFormat () const	const Format & Obtains the media source stream format.

## **Details**
## **Enumeration Type Documentation**
## AudioBitWidth
```
enum [AudioBitWidth](MultiMedia_MediaCommon.md#gae3e35ee2a2222a667fdebbc5b793ca7c)
```
**Description:**
Enumerates audio bit widths.

Enumerator	Description
BIT_WIDTH_8	8-bit width
BIT_WIDTH_16	16-bit width
BIT_WIDTH_24	24-bit width
BIT_WIDTH_BUTT	Invalid value

## AudioCodecFormat
```
enum [AudioCodecFormat](MultiMedia_MediaCommon.md#gaa4ea6f314644ed287e0704be26c768b7)
```
**Description:**
Enumerates audio codec formats.

Enumerator	Description
AUDIO_DEFAULT	Default format
AAC_LC	Advanced Audio Coding Low Complexity (AAC-LC)
AAC_HE_V1	High-Efficiency Advanced Audio Coding (AAC-HE), previously known as AAC+ or aacPlus v1
AAC_HE_V2	AAC++ or aacPlus v2
AAC_LD	Advanced Audio Coding Low Delay (AAC-LD)
AAC_ELD	Advanced Audio Coding Enhanced Low Delay (AAC-ELD)
FORMAT_BUTT	Invalid value

## AudioSourceType
```
enum [AudioSourceType](MultiMedia_MediaCommon.md#gadc3158e093b995ca7b9b6aa32388ccdd)
```
**Description:**
Enumerates audio source types.

Enumerator	Description
AUDIO_SOURCE_INVALID	Invalid audio source
AUDIO_SOURCE_DEFAULT	Default audio source
AUDIO_MIC	Microphone
AUDIO_VOICE_UPLINK	Uplink voice
AUDIO_VOICE_DOWNLINK	Downlink voice
AUDIO_VOICE_CALL	Voice call
AUDIO_CAMCORDER	Camcorder
AUDIO_VOICE_RECOGNITION	Voice recognition
AUDIO_VOICE_COMMUNICATION	Voice communication
AUDIO_REMOTE_SUBMIX	Remote submix
AUDIO_UNPROCESSED	Unprocessed audio
AUDIO_VOICE_PERFORMANCE	Voice performance
AUDIO_ECHO_REFERENCE	Echo reference
AUDIO_RADIO_TUNER	Radio tuner
AUDIO_HOTWORD	Hotword
AUDIO_REMOTE_SUBMIX_EXTEND	Extended remote submix

## AudioStreamType
```
enum [AudioStreamType](MultiMedia_MediaCommon.md#gae7077e4211e48131ae544adb20fc494a)
```
**Description:**
Enumerates audio stream types.

Enumerator	Description
TYPE_DEFAULT	Default audio stream type
TYPE_MEDIA	Media
TYPE_VOICE_COMMUNICATION	Voice call
TYPE_SYSTEM	System sound
TYPE_RING	Ringtone
TYPE_MUSIC	Music
TYPE_ALARM	Alarm
TYPE_NOTIFICATION	Notification
TYPE_BLUETOOTH_SCO	Bluetooth Synchronous Connection-Oriented (SCO)
TYPE_ENFORCED_AUDIBLE	Enforced audible
TYPE_DTMF	Dual-tone multi-frequency (DTMF)
TYPE_TTS	Text-To-Speech (TTS)
TYPE_ACCESSIBILITY	Accessibility

## BufferFlags
```
enum [OHOS::Media::StreamCallback::BufferFlags](MultiMedia_MediaCommon.md#ga6f4847f443de5cdf3641386011335e21) : uint32_t
```
**Description:**
Enumerates buffer types of stream sources.

Enumerator	Description
STREAM_FLAG_SYNCFRAME	Synchronous frame
STREAM_FLAG_CODECCONFIG	Codec configuration information
STREAM_FLAG_EOS	End of Stream (EOS)
STREAM_FLAG_PARTIAL_FRAME	Part of a frame
STREAM_FLAG_ENDOFFRAME	End of a frame. It is used in pair with STREAM_FLAG_PARTIAL_FRAME.
STREAM_FLAG_MUXER_DATA	Container file data, such as MP4 file data (not supported yet)

## FormatDataType
```
enum [OHOS::Media::FormatDataType](MultiMedia_MediaCommon.md#gaa3bfacc6563d8ec8bc870f4b216b4f46) : uint32_t
```
**Description:**
Enumerates formats.

Enumerator	Description
FORMAT_TYPE_NONE	None
FORMAT_TYPE_INT32	Int32
FORMAT_TYPE_INT64	Int64
FORMAT_TYPE_FLOAT	Float
FORMAT_TYPE_DOUBLE	Double
FORMAT_TYPE_STRING	String

## SourceType
```
enum [OHOS::Media::SourceType](MultiMedia_MediaCommon.md#ga4052b7b55dfd94f1d07678e79d80b507) : int32_t
```
**Description:**
Enumerates media source types.

Enumerator	Description
SOURCE_TYPE_URI	Local file path or network address
SOURCE_TYPE_FD	Local file descriptor
SOURCE_TYPE_STREAM	Stream data, such as Advanced Audio Coding (AAC) stream data

## VideoCodecFormat
```
enum [VideoCodecFormat](MultiMedia_MediaCommon.md#ga797e6c5e38e23e730eff5bcc41427d7e)
```
**Description:**
Enumerates video codec formats.

Enumerator	Description
VIDEO_DEFAULT	Default format
H264	H.264
HEVC	High Efficiency Video Coding (HEVC)

## **Function Documentation**
## CopyFrom\(\)
```
bool OHOS::Media::Format::CopyFrom (const [Format](OHOS-Media-Format.md) & format)
```
**Description:**
Sets all metadata to a specified format.
**Parameters:**

Name	Description
format	Indicates the format. For details, see Format.

**Returns:**
Returns **true** if the setting is successful; returns **false** otherwise.
## ErrCodeOffset\(\)
```
constexpr ErrCode OHOS::Media::ErrCodeOffset (unsigned int subsystem, unsigned int module = [/topic/body/section/screen/code
{""}) 0 (code] )
```
**Description:**
Generates a start error code with a unique identifier based on specified subsystem and module bit numbers.
**Parameters:**

Name	Description
subsystem	Indicates the subsystem bit number.
module	Indicates the module bit number.

**Returns:**
## Format\(\)
```
OHOS::Media::Format::Format ()
```
**Description:**
Default constructor of the [Format](OHOS-Media-Format.md) instance.
## GetBuffer\(\)
```
virtual uint8_t* OHOS::Media::StreamCallback::GetBuffer (size_t index)
```
**Description:**
Obtains the virtual address of a buffer memory block based on its index.
**Parameters:**

Name	Description
index	Indicates the index of the buffer memory block.

**Returns:**
Returns the pointer to the virtual address of the buffer memory block.
## GetDoubleValue\(\) \[1/2\]
```
bool OHOS::Media::Format::GetDoubleValue (const std::string & key, double & value ) const
```
**Description:**
Obtains the metadata value of the double-precision floating-point type.
**Parameters:**

Name	Description
key	Indicates the metadata key.
value	Indicates the metadata value to obtain, which is a double-precision floating-point number.

**Returns:**
Returns **true** if the double-precision number is successfully obtained; returns **false** otherwise.
## GetDoubleValue\(\) \[2/2\]
```
bool OHOS::Media::FormatData::GetDoubleValue (double & val) const
```
**Description:**
Obtains a double-precision floating-point number.
**Parameters:**

Name	Description
val	Indicates the double-precision floating-point number to obtain.

**Returns:**
Returns **true** if the double-precision number is successfully obtained; returns **false** otherwise.
## GetFloatValue\(\) \[1/2\]
```
bool OHOS::Media::Format::GetFloatValue (const std::string & key, float & value ) const
```
**Description:**
Obtains the metadata value of the single-precision floating-point type.
**Parameters:**

Name	Description
key	Indicates the metadata key.
value	Indicates the metadata value to obtain, which is a single-precision floating-point number.

**Returns:**
Returns **true** if the single-precision number is successfully obtained; returns **false** otherwise.
## GetFloatValue\(\) \[2/2\]
```
bool OHOS::Media::FormatData::GetFloatValue (float & val) const
```
**Description:**
Obtains a single-precision floating-point number.
**Parameters:**

Name	Description
val	Indicates the single-precision floating-point number to obtain.

**Returns:**
Returns **true** if the single-precision number is successfully obtained; returns **false** otherwise.
## GetFormatMap\(\)
```
const std::map& OHOS::Media::Format::GetFormatMap () const
```
**Description:**
Obtains the metadata map.
**Returns:**
Returns the map object.
## GetInt32Value\(\)
```
bool OHOS::Media::FormatData::GetInt32Value (int32_t & val) const
```
**Description:**
Obtains a 32-bit integer.
**Parameters:**

Name	Description
val	Indicates the 32-bit integer to obtain.

**Returns:**
Returns **true** if the integer is successfully obtained; returns **false** otherwise.
## GetInt64Value\(\)
```
bool OHOS::Media::FormatData::GetInt64Value (int64_t & val) const
```
**Description:**
Obtains a long integer.
**Parameters:**

Name	Description
val	Indicates the long integer to obtain.

**Returns:**
Returns **true** if the integer is successfully obtained; returns **false** otherwise.
## GetIntValue\(\)
```
bool OHOS::Media::Format::GetIntValue (const std::string & key, int32_t & value ) const
```
**Description:**
Obtains the metadata value of the integer type.
**Parameters:**

Name	Description
key	Indicates the metadata key.
value	Indicates the metadata value to obtain, which is a 32-bit integer.

**Returns:**
Returns **true** if the integer is successfully obtained; returns **false** otherwise.
## GetLongValue\(\)
```
bool OHOS::Media::Format::GetLongValue (const std::string & key, int64_t & value ) const
```
**Description:**
Obtains the metadata value of the long integer type.
**Parameters:**

Name	Description
key	Indicates the metadata key.
value	Indicates the metadata value to obtain, which is a 64-bit long integer.

**Returns:**
Returns **true** if the integer is successfully obtained; returns **false** otherwise.
## GetSourceHeader\(\)
```
const std::map& OHOS::Media::Source::GetSourceHeader () const
```
**Description:**
Obtains the HTTP header for the media source.
This function is called only when the [SourceType](Format.md#ga3ae727773c367ac1041d72ac770a0ab1) is [SOURCE\_TYPE\_URI](Format.md#gga3ae727773c367ac1041d72ac770a0ab1a70d32ea5aeaa325764508722ba31403c).
**Returns:**
Returns the media source header.
## GetSourceStream\(\)
```
const std::shared_ptr<[StreamSource](OHOS-Media-StreamSource.md)>& OHOS::Media::Source::GetSourceStream () const
```
**Description:**
Obtains information about the media source stream.
This function is called only when the [SourceType](Format.md#ga3ae727773c367ac1041d72ac770a0ab1) is [SOURCE\_TYPE\_STREAM](Format.md#gga3ae727773c367ac1041d72ac770a0ab1a7f632a791d8f6dfbe5940b5648d29e6c).
**Returns:**
Returns information about the media source stream. For details, see [StreamSource](OHOS-Media-StreamSource.md).
## GetSourceStreamFormat\(\)
```
const [Format](OHOS-Media-Format.md)& OHOS::Media::Source::GetSourceStreamFormat () const
```
**Description:**
Obtains the media source stream format.
**Returns:**
Returns the media source stream format. For details, see [Format](OHOS-Media-Format.md).
## GetSourceType\(\)
```
[SourceType](MultiMedia_MediaCommon.md#ga4052b7b55dfd94f1d07678e79d80b507) OHOS::Media::Source::GetSourceType () const
```
**Description:**
Obtains the source type.
**Returns:**
Returns the source type. For details, see [SourceType](Format.md#ga3ae727773c367ac1041d72ac770a0ab1).
## GetSourceUri\(\)
```
const std::string& OHOS::Media::Source::GetSourceUri () const
```
**Description:**
Obtains the media source URI.
This function is called only when the [SourceType](Format.md#ga3ae727773c367ac1041d72ac770a0ab1) is [SOURCE\_TYPE\_URI](Format.md#gga3ae727773c367ac1041d72ac770a0ab1a70d32ea5aeaa325764508722ba31403c).
**Returns:**
Returns the media source URI.
## GetStringValue\(\) \[1/2\]
```
bool OHOS::Media::Format::GetStringValue (const std::string & key, std::string & value ) const
```
**Description:**
Obtains the metadata value of the string type.
**Parameters:**

Name	Description
key	Indicates the metadata key.
value	Indicates the metadata value to obtain, which is a string.

**Returns:**
Returns **true** if the string is successfully obtained; returns **false** otherwise.
## GetStringValue\(\) \[2/2\]
```
bool OHOS::Media::FormatData::GetStringValue (std::string & val) const
```
**Description:**
Obtains a string.
**Parameters:**

Name	Description
val	Indicates the string to obtain.

**Returns:**
Returns **true** if the string is successfully obtained; returns **false** otherwise.
## GetType\(\)
```
[FormatDataType](MultiMedia_MediaCommon.md#gaa3bfacc6563d8ec8bc870f4b216b4f46) OHOS::Media::FormatData::GetType () const
```
**Description:**
Obtains the format type.
**Returns:**
Returns the format type. For details, see **OHOS::Media::FormatDataType**.
## OnBufferAvailable\(\)
```
virtual void OHOS::Media::StreamSource::OnBufferAvailable (size_t index, size_t offset, size_t size )
```
**Description:**
Notifies your application of the information about the buffer memory block that can be filled with data.
**Parameters:**

Name	Description
index	Indicates the index of the buffer memory block.
offset	Indicates the start offset into which the data will be written.
size	Indicates the size of data that the buffer memory block can store.

## PutDoubleValue\(\)
```
bool OHOS::Media::Format::PutDoubleValue (const std::string & key, double value )
```
**Description:**
Sets metadata of the double-precision floating-point type.
**Parameters:**

Name	Description
key	Indicates the metadata key.
value	Indicates the metadata value, which is a double-precision floating-point number.

**Returns:**
Returns **true** if the setting is successful; returns **false** otherwise.
## PutFloatValue\(\)
```
bool OHOS::Media::Format::PutFloatValue (const std::string & key, float value )
```
**Description:**
Sets metadata of the single-precision floating-point type.
**Parameters:**

Name	Description
key	Indicates the metadata key.
value	Indicates the metadata value, which is a single-precision floating-point number.

**Returns:**
Returns **true** if the metadata is successfully set; returns **false** otherwise.
## PutIntValue\(\)
```
bool OHOS::Media::Format::PutIntValue (const std::string & key, int32_t value )
```
**Description:**
Sets metadata of the integer type.
**Parameters:**

Name	Description
key	Indicates the metadata key.
value	Indicates the metadata value, which is a 32-bit integer.

**Returns:**
Returns **true** if the setting is successful; returns **false** otherwise.
## PutLongValue\(\)
```
bool OHOS::Media::Format::PutLongValue (const std::string & key, int64_t value )
```
**Description:**
Sets metadata of the long integer type.
**Parameters:**

Name	Description
key	Indicates the metadata key.
value	Indicates the metadata value, which is a 64-bit integer.

**Returns:**
Returns **true** if the setting is successful; returns **false** otherwise.
## PutStringValue\(\)
```
bool OHOS::Media::Format::PutStringValue (const std::string & key, const std::string & value )
```
**Description:**
Sets metadata of the string type.
**Parameters:**

Name	Description
key	Indicates the metadata key.
value	Indicates the metadata value, which is a string.

**Returns:**
Returns **true** if the metadata is successfully set; returns **false** otherwise.
## QueueBuffer\(\)
```
virtual void OHOS::Media::StreamCallback::QueueBuffer (size_t index, size_t offset, size_t size, int64_t timestampUs, uint32_t flags )
```
**Description:**
Writes the filled buffer memory block into the player memory.
**Parameters:**

Name	Description
index	Indicates the index of the buffer memory block.
offset	Indicates the start offset into which the buffer memory block will be written.
size	Indicates the size of the data filled in the buffer memory block.
timestampUs	Indicates the timestamp of the frame filled in the buffer memory block. As data in AAC streams can be filled not on a frame basis, set this parameter to 0 for AAC streams.
flags	Indicates the type of the current buffer memory block. For details, see BufferFlags.

## SetParameters\(\)
```
virtual void OHOS::Media::StreamCallback::SetParameters (const [Format](OHOS-Media-Format.md) & params)
```
**Description:**
Sets additional information about a stream.
**Parameters:**

Name	Description
params	Indicates the parameters for additional stream information. For details, see Format.

## SetStreamCallback\(\)
```
virtual void OHOS::Media::StreamSource::SetStreamCallback (const std::shared_ptr< [StreamCallback](OHOS-Media-StreamCallback.md) > & callback)
```
**Description:**
Sets a callback function for your application.
**Parameters:**

Name	Description
callback	Indicates the StreamCallback function to set.

## SetValue\(\) \[1/5\]
```
bool OHOS::Media::FormatData::SetValue (const std::string & val)
```
**Description:**
Sets a string.
**Parameters:**

Name	Description
val	Indicates the string to set.

**Returns:**
Returns **true** if the setting is successful; returns **false** otherwise.
## SetValue\(\) \[2/5\]
```
bool OHOS::Media::FormatData::SetValue (double val)
```
**Description:**
Sets a double-precision floating-point number.
**Parameters:**

Name	Description
val	Indicates the double-precision floating-point number to set.

**Returns:**
Returns **true** if the double-precision floating-point number is successfully set; returns **false** otherwise.
## SetValue\(\) \[3/5\]
```
bool OHOS::Media::FormatData::SetValue (float val)
```
**Description:**
Sets a single-precision floating-point number.
**Parameters:**

Name	Description
val	Indicates the single-precision floating-point number to set.

**Returns:**
Returns **true** if the setting is successful; returns **false** otherwise.
## SetValue\(\) \[4/5\]
```
bool OHOS::Media::FormatData::SetValue (int32_t val)
```
**Description:**
Sets a 32-bit integer.
**Parameters:**

Name	Description
val	Indicates the 32-bit integer to set.

**Returns:**
Returns **true** if the setting is successful; returns **false** otherwise.
## SetValue\(\) \[5/5\]
```
bool OHOS::Media::FormatData::SetValue (int64_t val)
```
**Description:**
Sets a 64-bit long integer.
**Parameters:**

Name	Description
val	Indicates the 64-bit long integer to set.

**Returns:**
Returns **true** if the setting is successful; returns **false** otherwise.
## Source\(\) \[1/3\]
```
OHOS::Media::Source::Source (const std::shared_ptr< [StreamSource](OHOS-Media-StreamSource.md) > & stream, const [Format](OHOS-Media-Format.md) & formats )
```
**Description:**
A constructor used to create a [Source](OHOS-Media-Source.md) instance based on the stream source and format information.
**Parameters:**

Name	Description
stream	Indicates the media source stream. For details, see StreamSource.
formats	Indicates stream data information, which is subject to the stream type. For example, the key is CODEC_MIME, and the value is MIME_AUDIO_AAC. For details, see Format. This parameter can be null if no information needs to be passed.

## Source\(\) \[2/3\]
```
OHOS::Media::Source::Source (const std::string & uri)
```
**Description:**
A constructor used to create a [Source](OHOS-Media-Source.md) instance based on a specified URI.
**Parameters:**

Name	Description
uri	Indicates the media source URI, which can be a network URI or local file path.

## Source\(\) \[3/3\]
```
OHOS::Media::Source::Source (const std::string & uri, const std::map< std::string, std::string > & header )
```
**Description:**
A constructor used to create a [Source](OHOS-Media-Source.md) instance based on a specified URI and header.
If the HTTP URL header does not carry valid information for network playback, this function is equivalent to [Source\(const std::string& uri\)](MultiMedia_MediaCommon.md#gab9bfa209ae382e3ba5d5242e8dfe5b20).
**Parameters:**

Name	Description
uri	Indicates the media source URI.
header	Indicates the header.

## **Variable Documentation**
## BITRATE\_MODE\_CBR
```
const int BITRATE_MODE_CBR = 2
```
**Description:**
Indicates the constant bit rate mode. In this mode, the codec keeps the output bit rate as constant as possible.
## BITRATE\_MODE\_CQ
```
const int BITRATE_MODE_CQ = 0
```
**Description:**
Indicates the constant quality mode. In this mode, the bit rate is not limited to guarantee the image quality to the largest extent.
## BITRATE\_MODE\_VBR
```
const int BITRATE_MODE_VBR = 1
```
**Description:**
Indicates the variable bit rate mode. In this mode, the codec dynamically adjusts the output bit rate based on the image complexity. The codec increases the bit rate if the image is complex and decreases the bit rate if the image is simple.
## CODEC\_MIME
```
const char* OHOS::Media::CODEC_MIME
```
**Description:**
Indicates the key representing the codec type.
## COLOR\_FORMAT\_ARGB8888\_32BIT
```
const int32_t COLOR_FORMAT_ARGB8888_32BIT = 16
```
**Description:**
Indicates the ARGB8888 color format.
## COLOR\_FORMAT\_YUV420SP
```
const int32_t COLOR_FORMAT_YUV420SP = 21
```
**Description:**
Indicates the YUV420SP color format.
## deviceId
```
uint32_t AudioDeviceDesc::deviceId
```
**Description:**
Bits 31-24: reserved bits; bits 23-16: mode ID; bits 15-8: device ID; bits 7-0: channel ID
## deviceName
```
std::string AudioDeviceDesc::deviceName
```
**Description:**
Device name
## ERR\_EARLY\_PREPARE
```
const int32_t OHOS::Media::ERR_EARLY_PREPARE = BASE_MEDIA_ERR_OFFSET + 3
```
**Description:**
Early media preparation
## ERR\_ILLEGAL\_STATE
```
const int32_t OHOS::Media::ERR_ILLEGAL_STATE = BASE_MEDIA_ERR_OFFSET + 1
```
**Description:**
Status error
## ERR\_INVALID\_OPERATION
```
const int32_t OHOS::Media::ERR_INVALID_OPERATION = BASE_MEDIA_ERR_OFFSET + 5
```
**Description:**
Invalid operation
## ERR\_INVALID\_PARAM
```
const int32_t OHOS::Media::ERR_INVALID_PARAM = BASE_MEDIA_ERR_OFFSET + 2
```
**Description:**
Invalid parameter
## ERR\_INVALID\_READ
```
const int32_t OHOS::Media::ERR_INVALID_READ = -1
```
**Description:**
Invalid data size that has been read
## ERR\_NOFREE\_CHANNEL
```
const int32_t OHOS::Media::ERR_NOFREE_CHANNEL = BASE_MEDIA_ERR_OFFSET + 6
```
**Description:**
No idle channel
## ERR\_NOT\_STARTED
```
const int32_t OHOS::Media::ERR_NOT_STARTED = BASE_MEDIA_ERR_OFFSET + 8
```
**Description:**
Device not started
## ERR\_READ\_BUFFER
```
const int32_t OHOS::Media::ERR_READ_BUFFER = BASE_MEDIA_ERR_OFFSET + 7
```
**Description:**
Buffer reading failed
## ERR\_SOURCE\_NOT\_SET
```
const int32_t OHOS::Media::ERR_SOURCE_NOT_SET = BASE_MEDIA_ERR_OFFSET + 4
```
**Description:**
No media source
## ERR\_UNKNOWN
```
const int32_t OHOS::Media::ERR_UNKNOWN = BASE_MEDIA_ERR_OFFSET + 200
```
**Description:**
Unknown error
## ERROR
```
const int32_t OHOS::Media::ERROR = BASE_MEDIA_ERR_OFFSET
```
**Description:**
Fail
## inputSourceType
```
[AudioSourceType](MultiMedia_MediaCommon.md#gadc3158e093b995ca7b9b6aa32388ccdd) AudioDeviceDesc::inputSourceType
```
**Description:**
Type of the audio input source
## KEY\_IS\_SYNC\_FRAME
```
const std::string KEY_IS_SYNC_FRAME = "is-sync-frame"
```
**Description:**
Indicates that the current frame is an Instantaneous Decoder Refresh \(IDR\) frame.
## KEY\_TIME\_US
```
const std::string KEY_TIME_US = "timeUs"
```
**Description:**
Indicates the frame timestamp.
## MIME\_AUDIO\_AAC
```
const char* OHOS::Media::MIME_AUDIO_AAC
```
**Description:**
Indicates the codec for Advanced Audio Coding \(AAC\) streams, which is a value of the codec type key.
## MIME\_AUDIO\_RAW
```
const char* OHOS::Media::MIME_AUDIO_RAW
```
**Description:**
Indicates the codec for RAW audios \(not supported yet\), which is a value of the codec type key.
## SUCCESS
```
const int32_t OHOS::Media::SUCCESS = 0
```
**Description:**
Success

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