Re: bets place for PA_STREAM_FIX_* flags

[Stefan Kost <ensonic hora-obscura de>]

On 16.08.2010 13:47, Alexey Fisher wrote:
> Hallo all,
>
> i working currently on cheese to make it use less resources. One thing
> what is in todo list is to make pulse use less CPU if i make record with
> cheese or other app. Current cheese will capture default stream and
> encode it. The problem is, gstreamers pulsesrc do not use same format
> provided by microphone, so pulse need to resample it and it use more
> cpu.
> Simple example: i have webcam which provide "s16le 1ch 16000Hz" pulsesrc
> will take "float32le 1ch 44100Hz". In this case pulse will convert it.
> At end point we have bigger file with 44100Hz even if we used source
> with 16000Hz.
>   

won't it work using: pulsesrc ! audio/x-raw-int, channels=1,rate=16000 ! ...

Stefan

> Solution is to use flags when creating the stream: PA_STREAM_FIX_FORMAT,
> PA_STREAM_FIX_RATE and PA_STREAM_FIX_CHANNELS.
>
> My question is: what is the proper place for this flags? Hard coded  in
> gst-plugins-good0.10? Or some haw by app what use pulsesrc?
> Other ideas?
>
>
> here is patch what i used to hard code this flags, it work fine for me:
> --- gst-plugins-good0.10-0.10.24.3.orig/ext/pulse/pulsesrc.c
> +++ gst-plugins-good0.10-0.10.24.3/ext/pulse/pulsesrc.c
> @@ -963,6 +963,8 @@ gst_pulsesrc_prepare (GstAudioSrc * asrc
>  #ifdef HAVE_PULSE_0_9_11
>            PA_STREAM_ADJUST_LATENCY |
>  #endif
> +          PA_STREAM_FIX_FORMAT | PA_STREAM_FIX_RATE |
> +          PA_STREAM_FIX_CHANNELS |
>            PA_STREAM_START_CORKED) < 0) {
>      GST_ELEMENT_ERROR (pulsesrc, RESOURCE, FAILED,
>          ("Failed to connect stream: %s",
>
>
> Regards,
> 	Alexey 
>
>
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