These are convenience macros that are specific to the opus_multistream_encoder_ctl() and opus_multistream_decoder_ctl() interface.  
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These are convenience macros that are specific to the opus_multistream_encoder_ctl() and opus_multistream_decoder_ctl() interface. 
The CTLs from Generic CTLs, Encoder related CTLs, and Decoder related CTLs may be applied to a multistream encoder or decoder as well. In addition, you may retrieve the encoder or decoder state for an specific stream via OPUS_MULTISTREAM_GET_ENCODER_STATE or OPUS_MULTISTREAM_GET_DECODER_STATE and apply CTLs to it individually. 
◆ OPUS_MULTISTREAM_GET_DECODER_STATE
      
        
          | #define OPUS_MULTISTREAM_GET_DECODER_STATE | ( |  | x, | 
        
          |  |  |  | y | 
        
          |  | ) |  |  | 
      
 
Gets the decoder state for an individual stream of a multistream decoder. 
- Parameters
- 
  
    | [in] | x | opus_int32: The index of the stream whose decoder you wish to retrieve. This must be non-negative and less than thestreamsparameter used to initialize the decoder. |  | [out] | y | OpusDecoder**: Returns a pointer to the given decoder state. |  
 
- Return values
- 
  
    | OPUS_BAD_ARG | The index of the requested stream was out of range. |  
 
 
 
◆ OPUS_MULTISTREAM_GET_ENCODER_STATE
      
        
          | #define OPUS_MULTISTREAM_GET_ENCODER_STATE | ( |  | x, | 
        
          |  |  |  | y | 
        
          |  | ) |  |  | 
      
 
Gets the encoder state for an individual stream of a multistream encoder. 
- Parameters
- 
  
    | [in] | x | opus_int32: The index of the stream whose encoder you wish to retrieve. This must be non-negative and less than thestreamsparameter used to initialize the encoder. |  | [out] | y | OpusEncoder**: Returns a pointer to the given encoder state. |  
 
- Return values
- 
  
    | OPUS_BAD_ARG | The index of the requested stream was out of range. |