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Only read samples from first .wav channel when converting to pcm.

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This commit is contained in:
Marcus Huderle 2015-11-07 10:39:57 -08:00
parent 965dd32443
commit fd08d3926b
1 changed files with 7 additions and 3 deletions
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10
pokemontools/pcm.py
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@ -49,10 +49,10 @@ def convert_to_pcm(filenames=[]):
Converts a .wav file into 1-bit pcm data.
Samples in the .wav file are simply clamped to on/off.
TODO: This currently only works correctly on .wav files with the following attributes:
This currently works correctly on .wav files with the following attributes:
1. Sample Width = 1 or 2 bytes (Some wave files use 3 bytes per sample...)
2. 1 Channel
It can be improved to account for these factors.
2. Arbitrary sample sample_rate
3. Mono or Stereo (1 or 2 channels)
"""
for filename in filenames:
samples, average_sample = get_wav_samples(filename)
@ -97,6 +97,7 @@ def get_wav_samples(filename):
sample_width = wav_file.getsampwidth()
sample_count = wav_file.getnframes()
sample_rate = wav_file.getframerate()
num_channels = wav_file.getnchannels()
samples = bytearray(wav_file.readframes(sample_count))
@ -114,6 +115,9 @@ def get_wav_samples(filename):
value = struct.unpack(fmt, samples[i:i + sample_width])[0]
unpacked_samples.append(value)
# Only keep the samples from the first audio channel.
unpacked_samples = unpacked_samples[::num_channels]
# Approximate the BASE_SAMPLE_RATE.
# Also find the average amplitude of the samples.
resampled_samples = []