o i @stddlZddlmZmZddlZdedeejejffddZddd d ee d e d ed edee e ff ddZ dS)N)OptionalTuple num_samplesreturncCsj|dkrtjdtjdtjdtjdfStjdtjd|tjd}tj|tjd}tj|tjd}||fS)z Generate equal-power crossfade curves (cosine/sine) with length num_samples. Returns (fade_out, fade_in) as float32 arrays in range [0.0, 1.0]. rdtypegg@)nponesfloat32linspacemathpicossin)ranglesfade_outfade_inr6/home/ubuntu/veenaModal/veena3modal/audio/crossfade.py_equal_power_fade_curvessri>2)sample_rate_hz crossfade_ms previous_tailnew_audio_bytesrrcCs|sd|pdfSd}t||d}||}|s4t||kr"d|fS|d| }|| d}||fS|} t||krt|t||} | dkrPd| |fS| |} tj| | dtjdtj} tj|d| tjdtj} t| \}}| || |tj}| d| |}t||kr|| dn|}||fStj| tjdtj} tj|d|tjdtj} t|\}}| || |tj}t|d|kr||| nd}||}|| d}||fS)a Perform equal-power crossfade between previous chunk tail and the start of a new chunk. Returns a tuple (to_emit, new_tail) where: - to_emit: bytes to stream now - new_tail: tail bytes to hold for the next iteration All audio is int16 PCM mono. iNrr) intlenr frombufferint16astyper rtobytes)rrrrbytes_per_samplecrossfade_samplescrossfade_bytesbodynew_tail prev_tail overlap_bytesoverlap_samples prev_overlap new_overlaprr crossfadedemitnew_tail_candidatemiddleto_emitrrrcrossfade_bytes_int16s@    "    "r2) r typingrrnumpyrrndarrayrbytesr2rrrrs"