Glitched audio on Raspberry Pi 3 when using ALSA driver #43927
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I can confirm this issue. Here you can listen the same audio played on VLC and then in Godot https://twitter.com/hiulit/status/1330873256904110081?s=20 |
charasyn
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Nov 27, 2020
When using the ALSA driver, corruption would occur if `snd_pcm_writei` was unable to consume the entire sound buffer. This would occur frequently on the Raspberry Pi 3 which uses the `snd_bcm2835` audio driver. This bug resulted from incorrect pointer math on line 187, resulting in the sample source pointer being advanced by `total * ad->channels` bytes instead of `total * ad->channels` samples. In my opinion, the best fix is to change `*src` to type `int16_t`, since that is the sample type in use. Fixes godotengine#43927.
akien-mga
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Dec 2, 2020
When using the ALSA driver, corruption would occur if `snd_pcm_writei` was unable to consume the entire sound buffer. This would occur frequently on the Raspberry Pi 3 which uses the `snd_bcm2835` audio driver. This bug resulted from incorrect pointer math on line 187, resulting in the sample source pointer being advanced by `total * ad->channels` bytes instead of `total * ad->channels` samples. In my opinion, the best fix is to change `*src` to type `int16_t`, since that is the sample type in use. Fixes godotengine#43927. (cherry picked from commit 25b2f82)
HEAVYPOLY
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Dec 14, 2020
When using the ALSA driver, corruption would occur if `snd_pcm_writei` was unable to consume the entire sound buffer. This would occur frequently on the Raspberry Pi 3 which uses the `snd_bcm2835` audio driver. This bug resulted from incorrect pointer math on line 187, resulting in the sample source pointer being advanced by `total * ad->channels` bytes instead of `total * ad->channels` samples. In my opinion, the best fix is to change `*src` to type `int16_t`, since that is the sample type in use. Fixes godotengine#43927. (cherry picked from commit 25b2f82)
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Godot version:
3.2.3
OS/device including version:
Linux raspberrypi-fgts 5.4.72-v7+ #1356 SMP Thu Oct 22 13:56:54 BST 2020 armv7l GNU/LinuxDebian 10.6 on Raspberry Pi 3
Audio driver: snd_bcm2835
Issue description:
Audio playback is garbled and swaps back and forth between sound channels (ex. sounds playing on only Left/Right channel can be heard on both speakers)
Steps to reproduce:
Run the given project on Raspberry Pi 3 and observe bad audio quality.
Minimal reproduction project:
testaudiopi.zip
I have debugged this and have determined that there is a bug in the ALSA driver, please see https://github.com/efornara/frt/issues/14#issuecomment-734964644
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