I am doing the same. I used snd_pcm_hw_params_set_period_size_near() to set the period size and checked the return value also; it was not an error. I have one more question. When you say 'Some periods are not supported', what does that mean? What are the constraints which make some periods not-supported by the audio codec driver? On Thu, Jul 3, 2008 at 5:11 PM, Gustavo da Silva Serra < gustavo.serra@xxxxxxxxxx> wrote: > Do you check the result of the function that sets the period size? Some > periods are not supported and you can't assume that they are valid and > proceed in your application. Use snd_pcm_hw_params_set_period_time_near to > see what is the nearest possible value for period. < > http://www.alsa-project.org/alsa-doc/alsa-lib/group___p_c_m___h_w___params.html#gf5e53bcb748185a4da3b8538720a5792 > > > > anuj aggarwal escreveu: > >> My audio driver supports buffer sizes from 128 to 32768 and period sizes >> from 8 to 2048. I am trying to set the period size as 1030 (just a random >> number between 8 & 2048, but not multiple of 2^n) and buffer size as >> 16*buffer_size (i.e. 16480). The output is as follows: >> >> Buffer size range from 128 to 32768 >> Period size range from 8 to 2048 >> Request period size 1030 and got 1030 >> Plug PCM: Hardware PCM card 0 'TWL4030' device 0 subdevice 0 >> Its setup is: >> stream : PLAYBACK >> access : RW_INTERLEAVED >> format : S16_LE >> subformat : STD >> channels : 2 >> rate : 44100 >> exact rate : 44100 (44100/1) >> msbits : 16 >> buffer_size : 16480 >> period_size : 1030 >> period_time : 23356 >> tstamp_mode : NONE >> period_step : 1 >> avail_min : 1030 >> start_threshold : 16480 >> stop_threshold : 16480 >> silence_threshold: 0 >> silence_size : 0 >> boundary : 1080033280 >> >> The problem with this setup is the application just hangs without playing >> anything. If I use period size as 2048, the app plays the song but clips >> the >> last part of it. If I use 1024/512, it works fine. >> >> I have tried alsa lib version 1.0.15 & 1.0.16 but the problem persists. Is >> there anything wrong with my app or audio driver? >> >> Please help. >> >> Thanks in advance, >> Anuj Aggarwal >> _______________________________________________ >> Alsa-devel mailing list >> Alsa-devel@xxxxxxxxxxxxxxxx >> http://mailman.alsa-project.org/mailman/listinfo/alsa-devel >> >> __________ NOD32 3238 (20080703) Information __________ >> >> This message was checked by NOD32 antivirus system. >> http://www.eset.com >> >> >> >> >> > > -- Best Regards, Anuj Aggarwal _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
