Agora RTC Objective-C API Reference  Refactor
Data Structures | Public Member Functions
IAudioFrameObserverBase Class Referenceabstract

Inherited by IAudioFrameObserver.

Data Structures

struct  AudioFrame
 

Public Member Functions

virtual bool onRecordAudioFrame (const char *channelId, AudioFrame &audioFrame)=0
 
virtual bool onPlaybackAudioFrame (const char *channelId, AudioFrame &audioFrame)=0
 
virtual bool onMixedAudioFrame (const char *channelId, AudioFrame &audioFrame)=0
 
virtual bool onEarMonitoringAudioFrame (AudioFrame &audioFrame)=0
 
virtual bool onPlaybackAudioFrameBeforeMixing (const char *channelId, base::user_id_t userId, AudioFrame &audioFrame)
 
virtual int getObservedAudioFramePosition ()=0
 

Detailed Description

The IAudioFrameObserverBase class.

Member Enumeration Documentation

◆ AUDIO_FRAME_TYPE

enum AUDIO_FRAME_TYPE

Audio frame type.

Enumerator
FRAME_TYPE_PCM16 

0: PCM 16

◆ anonymous enum

anonymous enum
Enumerator
MAX_HANDLE_TIME_CNT 

◆ AUDIO_FRAME_POSITION

enum AUDIO_FRAME_POSITION
Enumerator
AUDIO_FRAME_POSITION_NONE 
AUDIO_FRAME_POSITION_PLAYBACK 

The position for observing the playback audio of all remote users after mixing

AUDIO_FRAME_POSITION_RECORD 

The position for observing the recorded audio of the local user

AUDIO_FRAME_POSITION_MIXED 

The position for observing the mixed audio of the local user and all remote users

AUDIO_FRAME_POSITION_BEFORE_MIXING 

The position for observing the audio of a single remote user before mixing

AUDIO_FRAME_POSITION_EAR_MONITORING 

The position for observing the ear monitoring audio of the local user

Constructor & Destructor Documentation

◆ ~IAudioFrameObserverBase()

virtual ~IAudioFrameObserverBase ( )
inlinevirtual

Member Function Documentation

◆ onRecordAudioFrame()

virtual bool onRecordAudioFrame ( const char *  channelId,
AudioFrame &  audioFrame 
)
pure virtual

Gets the captured audio frame.

To ensure that the format of the cpatured audio frame is as expected, you can choose one of the following two methods to set the audio data format:

  • Method 1: After calling setRecordingAudioFrameParameters to set the audio data format and registerAudioFrameObserver to register the audio frame observer object, the SDK calculates the sampling interval according to the parameters set in the methods, and triggers the onRecordAudioFrame callback according to the sampling interval.
  • Method 2: After calling registerAudioFrameObserver to register the audio frame observer object, set the audio data format in the return value of the getObservedAudioFramePosition callback. The SDK then calculates the sampling interval according to the return value of the getRecordAudioParams callback, and triggers the onRecordAudioFrame callback according to the sampling interval.
Note
The priority of method 1 is higher than that of method 2. If method 1 is used to set the audio data format, the setting of method 2 is invalid.
Parameters
audioFrameThe raw audio data. See AudioFrame.
channelIdThe channel ID.
Returns
Without practical meaning.

◆ onPlaybackAudioFrame()

virtual bool onPlaybackAudioFrame ( const char *  channelId,
AudioFrame &  audioFrame 
)
pure virtual

Gets the raw audio frame for playback.

To ensure that the data format of audio frame for playback is as expected, Agora recommends that you choose one of the following two methods to set the audio data format:

  • Method 1: After calling setPlaybackAudioFrameParameters to set the audio data format and registerAudioFrameObserver to register the audio frame observer object, the SDK calculates the sampling interval according to the parameters set in the methods, and triggers the onPlaybackAudioFrame callback according to the sampling interval.
  • Method 2: After calling registerAudioFrameObserver to register the audio frame observer object, set the audio data format in the return value of the getObservedAudioFramePosition callback. The SDK then calculates the sampling interval according to the return value of the getPlaybackAudioParams callback, and triggers the onPlaybackAudioFrame callback according to the sampling interval.
Note
The priority of method 1 is higher than that of method 2. If method 1 is used to set the audio data format, the setting of method 2 is invalid.
Parameters
audioFrameThe raw audio data. See AudioFrame.
channelIdThe channel ID.
Returns
Without practical meaning.

◆ onMixedAudioFrame()

virtual bool onMixedAudioFrame ( const char *  channelId,
AudioFrame &  audioFrame 
)
pure virtual

Retrieves the mixed captured and playback audio frame.

To ensure that the data format of mixed captured and playback audio frame meets the expectations, Agora recommends that you choose one of the following two ways to set the data format:

  • Method 1: After calling setMixedAudioFrameParameters to set the audio data format and registerAudioFrameObserver to register the audio frame observer object, the SDK calculates the sampling interval according to the parameters set in the methods, and triggers the onMixedAudioFrame callback according to the sampling interval.
  • Method 2: After calling registerAudioFrameObserver to register the audio frame observer object, set the audio data format in the return value of the getObservedAudioFramePosition callback. The SDK then calculates the sampling interval according to the return value of the getMixedAudioParams callback, and triggers the onMixedAudioFrame callback according to the sampling interval.
Note
The priority of method 1 is higher than that of method 2. If method 1 is used to set the audio data format, the setting of method 2 is invalid.
Parameters
audioFrameThe raw audio data. See AudioFrame.
channelIdThe channel ID.
Returns
Without practical meaning.

◆ onEarMonitoringAudioFrame()

virtual bool onEarMonitoringAudioFrame ( AudioFrame &  audioFrame)
pure virtual

Gets the in-ear monitoring audio frame.

In order to ensure that the obtained in-ear audio data meets the expectations, Agora recommends that you choose one of the following two methods to set the in-ear monitoring-ear audio data format:

  • Method 1: After calling setEarMonitoringAudioFrameParameters to set the audio data format and registerAudioFrameObserver to register the audio frame observer object, the SDK calculates the sampling interval according to the parameters set in the methods, and triggers the onEarMonitoringAudioFrame callback according to the sampling interval.
  • Method 2: After calling registerAudioFrameObserver to register the audio frame observer object, set the audio data format in the return value of the getObservedAudioFramePosition callback. The SDK then calculates the sampling interval according to the return value of the getEarMonitoringAudioParams callback, and triggers the onEarMonitoringAudioFrame callback according to the sampling interval.
Note
The priority of method 1 is higher than that of method 2. If method 1 is used to set the audio data format, the setting of method 2 is invalid.
Parameters
audioFrameThe raw audio data. See AudioFrame.
Returns
Without practical meaning.

◆ onPlaybackAudioFrameBeforeMixing()

virtual bool onPlaybackAudioFrameBeforeMixing ( const char *  channelId,
base::user_id_t  userId,
AudioFrame &  audioFrame 
)
inlinevirtual

Occurs when the before-mixing playback audio frame is received.

Parameters
channelIdThe channel name
userIdID of the remote user.
audioFrameThe reference to the audio frame: AudioFrame.
Returns
  • true: The before-mixing playback audio frame is valid and is encoded and sent.
  • false: The before-mixing playback audio frame is invalid and is not encoded or sent.

◆ getObservedAudioFramePosition()

virtual int getObservedAudioFramePosition ( )
pure virtual

Sets the frame position for the video observer.

After successfully registering the audio data observer, the SDK uses this callback for each specific audio frame processing node to determine whether to trigger the following callbacks:

  • onRecordAudioFrame
  • onPlaybackAudioFrame
  • onPlaybackAudioFrameBeforeMixing
  • onMixedAudioFrame
  • onEarMonitoringAudioFrame You can set one or more positions you need to observe by modifying the return value of getObservedAudioFramePosition based on your scenario requirements: When the annotation observes multiple locations, the | (or operator) is required. To conserve system resources, you can reduce the number of frame positions that you want to observe.
Returns
a bitmask that sets the observation position, with the following values:
  • AUDIO_FRAME_POSITION_PLAYBACK (0x0001): This position can observe the playback audio mixed by all remote users, corresponding to the onPlaybackAudioFrame callback.
  • AUDIO_FRAME_POSITION_RECORD (0x0002): This position can observe the collected local user's audio, corresponding to the onRecordAudioFrame callback.
  • AUDIO_FRAME_POSITION_MIXED (0x0004): This position can observe the playback audio mixed by the loacl user and all remote users, corresponding to the onMixedAudioFrame callback.
  • AUDIO_FRAME_POSITION_BEFORE_MIXING (0x0008): This position can observe the audio of a single remote user before mixing, corresponding to the onPlaybackAudioFrameBeforeMixing callback.
  • AUDIO_FRAME_POSITION_EAR_MONITORING (0x0010): This position can observe the in-ear monitoring audio of the local user, corresponding to the onEarMonitoringAudioFrame callback.
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