PCM for APS/VAS Direct

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Seems like APS direct do have *PlayCbPcm *call back which is being called as
soon as I create the sound device. Not sure why its called as there is no
sound feed yet. but the play tonegen gives me no sound whatsover. Am I
missing anything? PlayCbPcm does decode PCM to ULAW which should be fine for
APS direct frame feed for playing. Please shed some light on it.

*

void* *PlayRingTone*()

{

   pjmedia_snd_port_param prm;

  pj_status_t status;

  pjmedia_tone_desc tones[1];

*  int* SAMPLES_PER_FRAME = 64;

*  int* ON_DURATION = 1500;

*  int* OFF_DURATION = 2500;

  pj_status_t status;

  status = pjmedia_tonegen_create(g_inv->pool, 8000, 1, SAMPLES_PER_FRAME,
16, 0, &ring_port);

  {

  tones[0].freq1 = 400;

  tones[0].freq2 = 0;

  tones[0].on_msec = ON_DURATION;

  tones[0].off_msec = OFF_DURATION;

  }

  status = pjmedia_aud_dev_default_param(-1, &prm.base);

  prm.base.clock_rate = 8000;

  prm.base.channel_count = 1;

  prm.base.samples_per_frame = 64;

  prm.base.bits_per_sample = 16;

  prm.base.flags |= *PJMEDIA_AUD_DEV_CAP_EXT_FORMAT*;

//prm.base.ext_fmt.bitrate = 64000;

  prm.base.ext_fmt.vad = 1;

  prm.base.ext_fmt.id = *PJMEDIA_FORMAT_L16*;

//prm.base.rec_id = -1;

  prm.base.play_id = -1;

  prm.base.dir = *PJMEDIA_DIR_PLAYBACK*;

//pjmedia_snd_port_create_player(
g_inv->pool,-1,8000,1,64,16,0,&ring_snd_dev);

  status = pjmedia_snd_port_create2(g_inv->pool,&prm,&ring_snd_dev);

*  *status = pjmedia_snd_port_connect(ring_snd_dev, ring_port);

  status = pjmedia_tonegen_play(ring_port, 1, tones, *PJMEDIA_TONEGEN_LOOP*);


}
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