nx_wav.nx

nx_wav.nx -- pure-NishiLang RIFF/WAVE (PCM 16-bit LE) writer. Why a sovereign WAV writer: it gives the substrate a path from i64 sample buffers to a file the operating system can play through any sound card with no library, no codec, no userspace audio stack dependency. /tmp/foo.wav -> aplay -> speakers; we hear our BFSK tones in the air. That is the "real test" hook between the modem primitives and human ears. The WAV header is the 1991 Microsoft RIFF spec; fully public. We write the canonical 44-byte form (no LIST/INFO chunks). genealogy_id: rfc_riff_1991 + microsoft_wave_spec + nx_bfsk_q10 lineage_id: nishi_wav_writer_q10 Header layout (PCM 16-bit LE, 44 bytes total): [0..3] "RIFF" [4..7] chunk size = 36 + data_bytes (LE u32) [8..11] "WAVE" [12..15] "fmt " [16..19] 16 (fmt chunk size, PCM) [20..21] 1 (PCM format) [22..23] channels [24..27] sample_rate [28..31] byte_rate = sample_rate * channels * 2 [32..33] block_align = channels * 2 [34..35] bits_per_sample = 16 [36..39] "data" [40..43] data_bytes = n_samples * channels * 2 [44..] sample data, int16 LE