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stream_wav: reduce minimal sample rate

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This commit is contained in:
Thomas Farstrike
2026-02-24 23:20:02 +01:00
parent 817807ca3a
commit 417b725473
1 changed files with 17 additions and 12 deletions
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internal_filesystem/lib/mpos/audio/stream_wav.py
+17 -12
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@@ -291,10 +291,10 @@ class WAVStream:
upsample_factor = (requested_rate + original_rate - 1) // original_rate
return original_rate * upsample_factor, upsample_factor
target_rate = 22050
if original_rate >= target_rate:
minimal_rate = 8000
if original_rate >= minimal_rate:
return original_rate, 1
upsample_factor = (target_rate + original_rate - 1) // original_rate
upsample_factor = (minimal_rate + original_rate - 1) // original_rate
return original_rate * upsample_factor, upsample_factor
# ----------------------------------------------------------------------
@@ -425,7 +425,7 @@ class WAVStream:
print(
"WAVStream: I2S config: "
f"format={'MONO' if channels == 1 else 'STEREO'}, "
f"ibuf=32000, has_sck={bool(self.i2s_pins.get('sck'))}, "
f"ibuf={playback_rate}, has_sck={bool(self.i2s_pins.get('sck'))}, "
f"mck_pin={self.i2s_pins.get('mck')}"
)
@@ -457,7 +457,7 @@ class WAVStream:
bits=16,
format=i2s_format,
rate=playback_rate,
ibuf=32000
ibuf=playback_rate
)
else:
self._i2s = machine.I2S(
@@ -468,7 +468,7 @@ class WAVStream:
bits=16,
format=i2s_format,
rate=playback_rate,
ibuf=32000
ibuf=playback_rate
)
except Exception as e:
print(f"WAVStream: I2S init failed: {e}")
@@ -480,11 +480,16 @@ class WAVStream:
# Chunk size tuning notes:
# - Smaller chunks = more responsive to stop()
# - Larger chunks = less overhead, smoother audio
# - The 32KB I2S buffer handles timing smoothness
chunk_size = 8192
bytes_per_original_sample = (bits_per_sample // 8) * channels
total_original = 0
# - The 0.5-second (stereo) or 1 second (mono) I2S buffer handles timing smoothness
bytes_per_second = original_rate * bytes_per_sample
chunk_size = int(bytes_per_second / 10)
# chunk_size of 8192 worked great with 22050hz stereo 16 bit so 88200 bytes per sample so fator 10.7
#chunk_size = bytes_per_second >> 3 # 12-14 fps
#chunk_size = bytes_per_second >> 4 # 16-18 fps but stutters
#chunk_size = int(bytes_per_second / 12) # 18 fps for 8khz mono, 16 fps for 22khz mono, higher stutters
#chunk_size = int(bytes_per_second / 11) # still jitters at 22050hz stereo in quasibird
total_original = 0
while total_original < data_size:
if not self._keep_running:
print("WAVStream: Playback stopped by user")
@@ -492,7 +497,7 @@ class WAVStream:
# Read chunk of original data
to_read = min(chunk_size, data_size - total_original)
to_read -= (to_read % bytes_per_original_sample)
to_read -= (to_read % bytes_per_sample)
if to_read <= 0:
break
@@ -528,7 +533,7 @@ class WAVStream:
time.sleep(num_samples / playback_rate)
total_original += to_read
self._progress_samples = total_original // bytes_per_original_sample
self._progress_samples = total_original // bytes_per_sample
print(f"WAVStream: Finished playing {self.file_path}")
if self.on_complete: