Send audio wav only on left device channel

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Hi guys,

I’m working on pjmedia split audio channel left/right and I have the following issue. I don’t know how to send audio from wav audio file only on left channel of default my audio device. My source code is:

 

//Test split left right channel

pjmedia_snd_port *snd;

pjmedia_port *sc, *sc_ch1;

pjsua_conf_port_id   sc_slot, sc_ch1_slot;

 

pjmedia_port *conf;

pj_status_t status;

 

/* Disable existing sound device */

conf = pjsua_set_no_snd_dev();

 

/* Create stereo-mono splitter/combiner */

status = pjmedia_splitcomb_create( pool, PJMEDIA_PIA_SRATE(&conf->info) /* clock rate */, 2 /* stereo */, 2 * PJMEDIA_PIA_SPF(&conf->info), PJMEDIA_PIA_BITS(&conf->info), 0 /* options */, &sc);

pj_assert(status == PJ_SUCCESS);

 

/* Connect channel0 (left channel) to conference port slot0 */

status = pjmedia_splitcomb_set_channel(sc, 1 /* ch1 */, 0 /*options*/, conf);

pj_assert(status == PJ_SUCCESS);

 

/* Create reverse channel for channel1 (right channel?)... */

status = pjmedia_splitcomb_create_rev_channel(pool, sc, 0  /* ch0 */, 0  /* options */, &sc_ch1);

pj_assert(status == PJ_SUCCESS);

 

status = pjsua_conf_add_port(pool, sc_ch1, &sc_ch1_slot);

pj_assert(status == PJ_SUCCESS);

 

pj_caching_pool cp;

pj_pool_t *poolAs;

pjmedia_port *file_port;

pjmedia_snd_port *snd_port;

 

/* Must create a pool factory before we can allocate any memory. */

pj_caching_pool_init(&cp, &pj_pool_factory_default_policy, 0);

 

/* Create memory pool for our file player */

poolAs = pj_pool_create(&cp.factory, /* pool factory */ "wav", /* pool name. */ 4000, /* init size */ 4000, /* increment size */ NULL /* callback on error */);

 

/* Create file media port from the WAV file */

status = pjmedia_wav_player_port_create(pool, /* memory pool */ "testSound.wav", /* file to play */ 20, /* ptime. */ 0, /* flags */ 0, /* default buffer */ &file_port/* returned port */    );

if (status != PJ_SUCCESS) {

       error("Unable to use WAV file", status);

}

 

/* Create sound player port. */

status = pjmedia_snd_port_create_player(poolAs, /* pool */

                     -1, /* use default dev. */

                     PJMEDIA_PIA_SRATE(&file_port->info),/* clock rate. */

                     PJMEDIA_PIA_CCNT(&file_port->info),/* # of channels. */

                     PJMEDIA_PIA_SPF(&file_port->info), /* samples per frame. */

                     PJMEDIA_PIA_BITS(&file_port->info),/* bits per sample. */

                     0, /* options */

                     &snd /* returned port */

              );

              if (status != PJ_SUCCESS) {

                     error("Unable to open sound device", status);

              }

 

              /* Connect file port to the sound player.

             

              status = pjmedia_snd_port_connect(snd, file_sc);

 

 

              /*

              * File should be playing and looping now, using sound device's thread.

              */

 

 

              /* Sleep to allow log messages to flush */

              pj_thread_sleep(100);

 

How can I solve the issue? Thanks in advice.

 

Best regards

Ll

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