Apple-2-SW/ii-sound
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Use the correct effective clock rate for a PAL Apple II, taking into account the long cycle.

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kris 2020-12-24 14:43:00 +00:00
parent 0bb7871355
commit 93b63db558
1 changed files with 8 additions and 4 deletions
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12
encode_audio.py
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@ -226,13 +226,17 @@ def main(argv):
step = int(argv[2])
# TODO: if we're not looking ahead beyond the longest (non-slowpath) opcode
# then this will reduce quality, e.g. a long NOTICK and TICK will
# both look the same over a too-short horizon, but have different results.
# then this will reduce quality, e.g. two opcodes may truncate to the
# same prefix, but have different results when we apply them fully.
lookahead_steps = int(argv[3])
out = argv[4]
# TODO: PAL Apple ][ clock rate is slightly different
sample_rate = int(1024. * 1000)
# Effective clock rate, including every-65 cycle "long cycle" that takes
# 16/14 as long.
#
# NTSC: 1020484
# PAL //c: 1015625
sample_rate = 1015657 # PAL
with open(out, "wb+") as f:
for opcode in audio_bytestream(