First: Many thanks for the help so far.
Now: I cannot find, in documentation or example/source code, how to connect a hardware device to the conference bridge. Disk files (to players) and network connections (to recorders) works fine.
My log shows that I have Alsa linked in and that Alsa can find the desired device:
11:05:51.849 alsa_dev.c ..Added sound device default:CARD=imx6qqmx6sgtl50
11:05:51.853 alsa_dev.c ..Added sound device sysdefault:CARD=imx6qqmx6sgtl50
11:05:51.881 alsa_dev.c ..ALSA driver found 2 devices
11:05:51.881 alsa_dev.c ..ALSA initialized.
aplay -l shows
**** List of PLAYBACK Hardware Devices ****
card 0: imx6qqmx6sgtl50 [imx6q-qmx6-sgtl5000], device 0: HiFi sgtl5000-0 []
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: imxhdmisoc [imx-hdmi-soc], device 0: i.MX HDMI Audio Tx hdmi-hifi-0 []
Subdevices: 1/1
Subdevice #0: subdevice #0
My source code:
int NumDevs = pjmedia_aud_dev_count();
printf("Getting %d Snd Devs\n", NumDevs);
pjmedia_aud_dev_info *AudDevInfo;
snd_pcm_t **PCMPlaybackHandle;
AudDevInfo = (pjmedia_aud_dev_info*)calloc(NumDevs,sizeof(pjmedia_aud_dev_info));
PCMPlaybackHandle = (snd_pcm_t**)calloc(NumDevs, sizeof(void *));
int iLoop;
for (iLoop = 0; iLoop < NumDevs; iLoop++)
{
status = pjmedia_aud_dev_get_info(iLoop, &AudDevInfo[iLoop]);
printf("%d: %s (in=%d, out=%d)\n", iLoop, AudDevInfo[iLoop].name, AudDevInfo[iLoop].input_count, AudDevInfo[iLoop].output_count);
printf("Opening %s\n", AudDevInfo[iLoop].name);
status = snd_pcm_open ( &PCMPlaybackHandle[iLoop], AudDevInfo[iLoop].name, SND_PCM_STREAM_PLAYBACK, 0);
status = pjsua_set_snd_dev(LV.HWmic,LV.HWdsp); // Device IDs from ??? (these are both zero)
printf("Sound devices set, now to get\n");
status = pjsua_get_snd_dev(&LV.HWmic,&LV.HWdsp); // Device IDs from ??? (these are -1 and -2)
char buf[1024];
pj_str_t PjStr = pj_strerror (status, buf, 1024);
PJ_LOG(3,(__FILE__,"%s pjsua_get_snd_dev returned %d(%.*s) mic %d dsp %d", __FUNCTION__, status, PjStr.slen, PjStr.ptr, LV.HWmic, LV.HWdsp));
}
LV.DSPConfPort = pjsua_player_get_conf_port(LV.HWdsp);
results in this output:
Getting 2 Snd Devs
0: default:CARD=imx6qqmx6sgtl50 (in=1, out=1)
Opening default:CARD=imx6qqmx6sgtl50
13:50:08.690 pjsua_aud.c Set sound device: capture=0, playback=0
13:50:08.690 /home/advance/ .cb_on_snd_dev_operation, Opening
13:50:08.690 pjsua_aud.c .Opening sound device PCM at 16000/1/20ms
13:50:08.690 alsa_dev.c ..open_playback: Open playback device 'default:CARD=imx6qqmx6sgtl50'
13:50:08.692 alsa_dev.c ..ALSA lib /home/advance/fsl-community-bsp/build/tmp/work/cortexa9hf-vfp-neon-poky-linux-gnueabi/alsa-lib/1.0.27.2-r0/alsa-lib-1.
13:50:08.692 /home/advance/ .cb_on_snd_dev_operation, Opening
13:50:08.693 pjsua_aud.c .Opening sound device PCM at 44100/1/20ms
13:50:08.693 alsa_dev.c ..open_playback: Open playback device 'default:CARD=imx6qqmx6sgtl50'
13:50:08.695 alsa_dev.c ..ALSA lib /home/advance/fsl-community-bsp/build/tmp/work/cortexa9hf-vfp-neon-poky-linux-gnueabi/alsa-lib/1.0.27.2-r0/alsa-lib-1.
13:50:08.695 /home/advance/ .cb_on_snd_dev_operation, Opening
13:50:08.695 pjsua_aud.c .Opening sound device PCM at 48000/1/20ms
13:50:08.695 alsa_dev.c ..open_playback: Open playback device 'default:CARD=imx6qqmx6sgtl50'
13:50:08.697 alsa_dev.c ..ALSA lib /home/advance/fsl-community-bsp/build/tmp/work/cortexa9hf-vfp-neon-poky-linux-gnueabi/alsa-lib/1.0.27.2-r0/alsa-lib-1.
13:50:08.697 /home/advance/ .cb_on_snd_dev_operation, Opening
13:50:08.697 pjsua_aud.c .Opening sound device PCM at 32000/1/20ms
13:50:08.698 alsa_dev.c ..open_playback: Open playback device 'default:CARD=imx6qqmx6sgtl50'
13:50:08.699 alsa_dev.c ..ALSA lib /home/advance/fsl-community-bsp/build/tmp/work/cortexa9hf-vfp-neon-poky-linux-gnueabi/alsa-lib/1.0.27.2-r0/alsa-lib-1.
13:50:08.700 /home/advance/ .cb_on_snd_dev_operation, Opening
13:50:08.700 pjsua_aud.c .Opening sound device PCM at 16000/1/20ms
13:50:08.700 alsa_dev.c ..open_playback: Open playback device 'default:CARD=imx6qqmx6sgtl50'
13:50:08.702 alsa_dev.c ..ALSA lib /home/advance/fsl-community-bsp/build/tmp/work/cortexa9hf-vfp-neon-poky-linux-gnueabi/alsa-lib/1.0.27.2-r0/alsa-lib-1.
13:50:08.702 /home/advance/ .cb_on_snd_dev_operation, Opening
13:50:08.702 pjsua_aud.c .Opening sound device PCM at 8000/1/20ms
13:50:08.702 alsa_dev.c ..open_playback: Open playback device 'default:CARD=imx6qqmx6sgtl50'
13:50:08.704 alsa_dev.c ..ALSA lib /home/advance/fsl-community-bsp/build/tmp/work/cortexa9hf-vfp-neon-poky-linux-gnueabi/alsa-lib/1.0.27.2-r0/alsa-lib-1.
13:50:08.704 pjsua_aud.c .Unable to open sound device: Unknown error from audio driver (PJMEDIA_EAUD_SYSERR) [status=420002]
Sound devices set, now to get
13:50:08.705 /home/advance/ main pjsua_get_snd_dev returned 0(Success) mic -1 dsp -2
1: sysdefault:CARD=imx6qqmx6sgtl50 (in=1, out=1)
Opening sysdefault:CARD=imx6qqmx6sgtl50
13:50:08.706 alsa_dev.c ALSA lib /home/advance/fsl-community-bsp/build/tmp/work/cortexa9hf-vfp-neon-poky-linux-gnueabi/alsa-lib/1.0.27.2-r0/alsa-lib-1.
13:50:08.707 pjsua_aud.c Set sound device: capture=-1, playback=-2
13:50:08.707 /home/advance/ .cb_on_snd_dev_operation, Opening
13:50:08.707 pjsua_aud.c .Opening sound device PCM at 16000/1/20ms
13:50:08.707 alsa_dev.c ..open_playback: Open playback device 'default:CARD=imx6qqmx6sgtl50'
13:50:08.709 alsa_dev.c ..ALSA lib /home/advance/fsl-community-bsp/build/tmp/work/cortexa9hf-vfp-neon-poky-linux-gnueabi/alsa-lib/1.0.27.2-r0/alsa-lib-1.
13:50:08.709 /home/advance/ .cb_on_snd_dev_operation, Opening
13:50:08.709 pjsua_aud.c .Opening sound device PCM at 44100/1/20ms
13:50:08.709 alsa_dev.c ..open_playback: Open playback device 'default:CARD=imx6qqmx6sgtl50'
13:50:08.711 alsa_dev.c ..ALSA lib /home/advance/fsl-community-bsp/build/tmp/work/cortexa9hf-vfp-neon-poky-linux-gnueabi/alsa-lib/1.0.27.2-r0/alsa-lib-1.
13:50:08.712 /home/advance/ .cb_on_snd_dev_operation, Opening
13:50:08.712 pjsua_aud.c .Opening sound device PCM at 48000/1/20ms
13:50:08.712 alsa_dev.c ..open_playback: Open playback device 'default:CARD=imx6qqmx6sgtl50'
13:50:08.714 alsa_dev.c ..ALSA lib /home/advance/fsl-community-bsp/build/tmp/work/cortexa9hf-vfp-neon-poky-linux-gnueabi/alsa-lib/1.0.27.2-r0/alsa-lib-1.
13:50:08.714 /home/advance/ .cb_on_snd_dev_operation, Opening
13:50:08.714 pjsua_aud.c .Opening sound device PCM at 32000/1/20ms
13:50:08.714 alsa_dev.c ..open_playback: Open playback device 'default:CARD=imx6qqmx6sgtl50'
13:50:08.716 alsa_dev.c ..ALSA lib /home/advance/fsl-community-bsp/build/tmp/work/cortexa9hf-vfp-neon-poky-linux-gnueabi/alsa-lib/1.0.27.2-r0/alsa-lib-1.
13:50:08.716 /home/advance/ .cb_on_snd_dev_operation, Opening
13:50:08.716 pjsua_aud.c .Opening sound device PCM at 16000/1/20ms
13:50:08.716 alsa_dev.c ..open_playback: Open playback device 'default:CARD=imx6qqmx6sgtl50'
13:50:08.718 alsa_dev.c ..ALSA lib /home/advance/fsl-community-bsp/build/tmp/work/cortexa9hf-vfp-neon-poky-linux-gnueabi/alsa-lib/1.0.27.2-r0/alsa-lib-1.
13:50:08.719 /home/advance/ .cb_on_snd_dev_operation, Opening
13:50:08.719 pjsua_aud.c .Opening sound device PCM at 8000/1/20ms
13:50:08.719 alsa_dev.c ..open_playback: Open playback device 'default:CARD=imx6qqmx6sgtl50'
13:50:08.721 alsa_dev.c ..ALSA lib /home/advance/fsl-community-bsp/build/tmp/work/cortexa9hf-vfp-neon-poky-linux-gnueabi/alsa-lib/1.0.27.2-r0/alsa-lib-1.
13:50:08.721 pjsua_aud.c .Unable to open sound device: Unknown error from audio driver (PJMEDIA_EAUD_SYSERR) [status=420002]
Sound devices set, now to get
13:50:08.721 /home/advance/ main pjsua_get_snd_dev returned 0(Success) mic -1 dsp -2
EleVoIP: ../src/pjsua-lib/pjsua_aud.c:1195: pjsua_player_get_conf_port: Assertion `id>=0&&id<(int)(sizeof(pjsua_var.player)/sizeof(pjsua_var.player[0]))' failed.
It appears that the -1 and -2 are not legit.
Clues, tips, pointers, etc. greatly appreciated.
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