Kontron KTAM3874-pITX Manual de usuario descargar pdf (Pagina 118)

KTD-S0057-I Page 114 Linux® Programming Examples (DebianTM)

KTAM3874/pITX Software Guide

while (elem)

{

elem_name = snd_mixer_selem_get_name (elem);

if (! strcasecmp (elem_name, playb_name))

{

dev->elem = elem;

return EXIT_SUCCESS;

}

elem = snd_mixer_elem_next (elem);

}

fprintf (stderr, "Cannot find mixer element\n");

return EXIT_FAILURE;

}

int get_playb_vol (mixer_dev *dev, playb_vol *vol)

{

long val;

if (snd_mixer_selem_get_playback_dB (dev->elem, SND_MIXER_SCHN_FRONT_LEFT, &val) < 0)

{

fprintf (stderr, "Cannot get playback volume\n");

return EXIT_FAILURE;

}

vol->left = val / 100L;

if (snd_mixer_selem_get_playback_dB (dev->elem, SND_MIXER_SCHN_FRONT_RIGHT, &val) < 0)

{

fprintf (stderr, "Cannot get playback volume\n");

return EXIT_FAILURE;

}

vol->right = val / 100L;

return EXIT_SUCCESS;

}

int set_playb_vol (mixer_dev *dev, playb_vol *vol)

{

if (snd_mixer_selem_set_playback_dB (dev->elem, SND_MIXER_SCHN_FRONT_LEFT, vol->left * 100L, 0) < 0)

{

fprintf (stderr, "Cannot set playback volume\n");

return EXIT_FAILURE;

}

if (snd_mixer_selem_set_playback_dB (dev->elem, SND_MIXER_SCHN_FRONT_RIGHT,

vol->right * 100L, 0) < 0)

{

fprintf (stderr, "Cannot set playback volume\n");

return EXIT_FAILURE;

}

return EXIT_SUCCESS;

}

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