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Hi, I have some code that works on my dev machine but breaks on my target machine. The essential differences are different libasound versions and different audio devices. The code is compiled and linked separately on the dev system and the target system. The data used to set the buffer size is the same in both cases. The code fragment is if ( ( err = snd_pcm_hw_params_set_buffer_size ( playback_handle, hw_params, bufout ) ) < 0 ) { ERR ( "cda_AlsaManager::_setupPlayback cannot set buffer size (%s)\n", snd_strerror ( err ) ); } .... snd_pcm_hw_params_get_buffer_size ( hw_params, &bufferSize ); INF ( "cda_AlsaManager::_setupPlayback Buffer size = %d bytes \n", bufferSize ); On the dev system (Wheezy) this works fine. Sep 26 2014 09:17:32 INFO : int cda_AlsaManager::_setupPlayback(const char*, unsigned int*, snd_pcm_format_t, int, int)() (135) cda_AlsaManager::_setupPlayback opening device default Sep 26 2014 09:17:32 INFO : int cda_AlsaManager::_setupPlayback(const char*, unsigned int*, snd_pcm_format_t, int, int)() (180) cda_AlsaManager::_setupPlayback setting buffer size 882 Sep 26 2014 09:17:32 INFO : int cda_AlsaManager::_setupPlayback(const char*, unsigned int*, snd_pcm_format_t, int, int)() (206) cda_AlsaManager::_setupPlayback Buffer size = 882 bytes Dev Libraries are ii libasound2:i386 1.0.25-4 i386 shared library for ALSA applications ii libasound2-dev:i386 1.0.25-4 i386 shared library for ALSA applications -- development filesOn the target system (Centos 5) I get the error message Sep 26 2014 10:08:18 INFO : int cda_AlsaManager::_setupPlayback(const char*, unsigned int*, snd_pcm_format_t, int, int)() (135) cda_AlsaManager::_setupPlayback opening device default Sep 26 2014 10:08:18 INFO : int cda_AlsaManager::_setupPlayback(const char*, unsigned int*, snd_pcm_format_t, int, int)() (180) cda_AlsaManager::_setupPlayback setting buffer size 882 Sep 26 2014 10:08:18 ERROR : int cda_AlsaManager::_setupPlayback(const char*, unsigned int*, snd_pcm_format_t, int, int)() (187) cda_AlsaManager::_setupPlayback cannot set buffer size (Invalid argument) Sep 26 2014 10:08:18 INFO : int cda_AlsaManager::_setupPlayback(const char*, unsigned int*, snd_pcm_format_t, int, int)() (206) cda_AlsaManager::_setupPlayback Buffer size = 15052 bytes Target Libraries are alsa-lib.i386 1.0.17-1.el5 installed alsa-lib-devel.i386 1.0.17-1.el5 installed I don't have the option of changing the library version on the target system. Data being written is 16 bit PCM mono 44100 Hz and the target system uses a USB audio device based on Burr-Brown chipset. Any suggestions? --
Jeremy Ardley |
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