Harman Kalra wrote:
Can you please explain difference between signed and unsigned PCMformats,
Signed PCM formats have a sign, unsigned don't. S16 allows values in the range -32768..32767, U16, 0..65535.
in what cases does unsigned is used,
In practice, never. It was historically used by some 8-bit cards.
which is more efficient (memory and sound clarity)
I refer the honourable gentleman to the reply I gave in the last mail.
If you tried to set MPEG format, ALSA would inform you that the device does not support this.
But when I queried the hardware regarding the supported audioformats using the api " snd_pcm_format_name", it responded with a list of formats, including , A-law, u-law-, IMA_ADPCM, MPEG, GSM, so what does it mean.
It means that the sample format identified by the constant SND_PCM_FORMAT_MPEG is indeed named "MPEG". This has nothing to do with what formats some particular hardware supports.
What would be audio sample file size in case of A-law, will it besame as U8.
I refer the honourable gentleman to the reply I gave in the last mail.
Regards, Clemens