[alsa-devel] Selecting Audio formats
clemens at ladisch.de
Thu Jul 19 17:00:03 CEST 2012
Harman Kalra wrote:
> Since so many PCM formats such as S8, U8, S16_LE, U16_LE, A-law, u-law-,
> IMA_ADPCM, MPEG, GSM, etc are there so which format should I opt for.
In most cases, you should use some format supported by your hardware.
Typically, this is S16.
> 1. What is difference between signed and unsigned PCM format, how does
> it can affect the sound quality.
It does not affect the sound quality.
> 2. If I go for MPEG format, does it mean that audio compression would
> handled at my audio port level and my DSP processor would not come into
If you tried to set MPEG format, ALSA would inform you that the device
does not support this.
> 4. If I opt for A-law or u-law, what could be benefits/disadvantages of
> using these formats.
These formats use one byte per sample, like U8, but have more dynamic
range than U8. They are still worse than S16.
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