Decodes a frame of audio.
@param st Decoder state
@param data Compressed data produced by an encoder
@param len Number of bytes to read from "data". This MUST be exactly the number
of bytes returned by the encoder. Using a larger value WILL NOT WORK.
@param pcm One frame (frame_size samples per channel) of decoded PCM will be
returned here in float format.
@return Error code.
Decodes a frame of audio. @param st Decoder state @param data Compressed data produced by an encoder @param len Number of bytes to read from "data". This MUST be exactly the number of bytes returned by the encoder. Using a larger value WILL NOT WORK. @param pcm One frame (frame_size samples per channel) of decoded PCM will be returned here in float format. @return Error code.