C++ snd_mixer_find_selem函数代码示例

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本文整理汇总了C++中snd_mixer_find_selem函数的典型用法代码示例。如果您正苦于以下问题：C++ snd_mixer_find_selem函数的具体用法？C++ snd_mixer_find_selem怎么用？C++ snd_mixer_find_selem使用的例子？那么恭喜您, 这里精选的函数代码示例或许可以为您提供帮助。

在下文中一共展示了snd_mixer_find_selem函数的20个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于我们的系统推荐出更棒的C++代码示例。

示例1: snd_mixer_open

char *get_vol(char *buf) {
	long max = 0, min = 0, vol = 0;
	int mute = 0;

	snd_mixer_t *handle;
	snd_mixer_elem_t *pcm_mixer, *mas_mixer;
	snd_mixer_selem_id_t *vol_info, *mute_info;

	snd_mixer_open(&handle, 0);
	snd_mixer_attach(handle, "default");
	snd_mixer_selem_register(handle, NULL, NULL);
	snd_mixer_load(handle);
	snd_mixer_selem_id_malloc(&vol_info);
	snd_mixer_selem_id_malloc(&mute_info);
	snd_mixer_selem_id_set_name(vol_info, VOL_CH);
	snd_mixer_selem_id_set_name(mute_info, VOL_CH);
	pcm_mixer = snd_mixer_find_selem(handle, vol_info);
	mas_mixer = snd_mixer_find_selem(handle, mute_info);
	snd_mixer_selem_get_playback_volume_range((snd_mixer_elem_t *)pcm_mixer, &min, &max);
	snd_mixer_selem_get_playback_volume((snd_mixer_elem_t *)pcm_mixer, SND_MIXER_SCHN_MONO, &vol);
	snd_mixer_selem_get_playback_switch(mas_mixer, SND_MIXER_SCHN_MONO, &mute);
	sprintf(buf, !(mute) ? VOL_MUTE_S : VOL_S, (int)vol * 100 / (int)max);
	if(vol_info)
		snd_mixer_selem_id_free(vol_info);
	if(mute_info)
		snd_mixer_selem_id_free(mute_info);
	if(handle)
		snd_mixer_close(handle);
	return buf;
}

开发者ID:SushiDesu，项目名称:dwmstat，代码行数:30，代码来源:dwmstat.c

示例2: init_alsa

/**
 * init_alsa
 * must be called before other alsa functions
 * only needs to be called once
 * initializes alsa handle
 */
void
init_alsa()
{
        snd_mixer_open(&alsa, 0);
        snd_mixer_attach(alsa, SOUNDCARD);
        snd_mixer_selem_register(alsa, NULL, NULL);
        snd_mixer_load(alsa);

        if (alsa == NULL)
        {
                fprintf(stderr, "error opening sound card " SOUNDCARD);
                return;
        }

        snd_mixer_selem_id_t *sid;
        snd_mixer_selem_id_alloca(&sid);
        snd_mixer_selem_id_set_index(sid, 0);
        snd_mixer_selem_id_set_name(sid, ALSAMIXER);
        alsamixer = snd_mixer_find_selem(alsa, sid);

        if (alsamixer == NULL)
        {
                fprintf(stderr, "error opening alsa mixer " ALSAMIXER);
                return;
        }
}

开发者ID:mjheagle8，项目名称:status，代码行数:32，代码来源:alsa.c

示例3: asound_set_channel

void asound_set_channel(const gchar * channel)
{
    if(m_mixer == NULL || channel == NULL) {
        return;
    }
    if(g_strcmp0(channel, m_channel) == 0)
        return;

    // Clean up any previously set channels
    g_free(m_channel);
    m_channel = g_strdup(channel);
    if(m_elem)
    {
        snd_mixer_elem_set_callback(m_elem, NULL);
        m_elem = NULL;
    }

    // Setup m_elem using the provided channelname
    snd_mixer_selem_id_t * sid;
    snd_mixer_selem_id_malloc(&sid);
    snd_mixer_selem_id_set_name(sid, channel);
    m_elem = snd_mixer_find_selem(m_mixer, sid);
    if(m_elem != NULL)
    {
        snd_mixer_elem_set_callback(m_elem, asound_elem_event);
        snd_mixer_selem_id_free(sid);
    }
}

开发者ID:cvfgcxgsdgfdcv，项目名称:volumeicon，代码行数:28，代码来源:alsa_backend.c

示例4: get_master_volume

static long get_master_volume()
{
    snd_mixer_t *handle;
    snd_mixer_open(&handle, 0);
    snd_mixer_attach(handle, Y50_CTL_NAME);
    snd_mixer_selem_register(handle, NULL, NULL);
    snd_mixer_load(handle);

    snd_mixer_selem_id_t *master_sid;
    const char *master_selem_name = "Master";

    snd_mixer_selem_id_alloca(&master_sid);
    snd_mixer_selem_id_set_index(master_sid, 0);
    snd_mixer_selem_id_set_name(master_sid, master_selem_name);
    snd_mixer_elem_t* elem = snd_mixer_find_selem(handle, master_sid);

    long min, max;
    snd_mixer_selem_get_playback_volume_range(elem, &min, &max);

    long volume;
    snd_mixer_selem_get_playback_volume(elem, SND_MIXER_SCHN_MONO, &volume);

    snd_mixer_close(handle);

    return volume * 100 / max;
}

开发者ID:polter-rnd，项目名称:y50-subwoofer，代码行数:26，代码来源:y50-subwoofer.c

示例5: snd_card_get_index

mixerVolume::mixerVolume(const char *name, const char *card, long volume) {
	snd_mixer_selem_id_t *sid = NULL;
	elem = NULL;
	handle = NULL;
	min = 0;
	max = 100;
	char cardId[10];

	if (!name || !card)
		return;

	int cx = snd_card_get_index(card);
	if (cx < 0 || cx > 31)
		return;
	snprintf(cardId, sizeof(cardId), "hw:%i", cx);

	if (0 > snd_mixer_open(&handle, 0))
		return;
	if (0 > snd_mixer_attach(handle, cardId))
		return;
	if (0 > snd_mixer_selem_register(handle, NULL, NULL))
		return;
	if (0 > snd_mixer_load(handle))
		return;
	snd_mixer_selem_id_alloca(&sid);
	if (!sid)
		return;
	snd_mixer_selem_id_set_index(sid, 0);
	snd_mixer_selem_id_set_name(sid, name);
	elem = snd_mixer_find_selem(handle, sid);
	if (elem) {
		snd_mixer_selem_get_playback_volume_range(elem, &min, &max);
		setVolume(volume);
	}
}

开发者ID:FFTEAM，项目名称:DDT-libstb-hal-cst-next，代码行数:35，代码来源:audio_mixer.cpp

示例6: set_volume

void set_volume(GtkAdjustment *adjustment, gpointer user_data)
{
  int value = (int) 100 - gtk_adjustment_get_value(adjustment);
  g_debug("Setting master volume to: %d", value);

  if(value == 0)
    gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(s_mute), TRUE);
  else
    gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(s_mute), FALSE);

  long min, max;
  snd_mixer_t *mix;
  snd_mixer_selem_id_t *sid;
  const char *card = "default";
  const char *selem_name = "Master";

  snd_mixer_open(&mix, 0);
  snd_mixer_attach(mix, card);
  snd_mixer_selem_register(mix, NULL, NULL);
  snd_mixer_load(mix);

  snd_mixer_selem_id_alloca(&sid);
  snd_mixer_selem_id_set_index(sid, 0);
  snd_mixer_selem_id_set_name(sid, selem_name);
  snd_mixer_elem_t* elem = snd_mixer_find_selem(mix, sid);

  snd_mixer_selem_get_playback_volume_range(elem, &min, &max);
  snd_mixer_selem_set_playback_volume_all(elem, value * max / 100);

  snd_mixer_close(mix);

}

开发者ID:tom2901，项目名称:desktop，代码行数:32，代码来源:volume.c

示例7: snd_mixer_open

char *getvolume() {
    char *buf;
    int active;
    long volume, min, max;
    snd_mixer_t *handle;
    snd_mixer_selem_id_t *sid;
    snd_mixer_elem_t* elem;
    const char *card = "default";
    const char *selem_name = "Master";

    snd_mixer_open(&handle, 0);
    snd_mixer_attach(handle, card);
    snd_mixer_selem_register(handle, NULL, NULL);
    snd_mixer_load(handle);

    snd_mixer_selem_id_alloca(&sid);
    snd_mixer_selem_id_set_index(sid, 0);
    snd_mixer_selem_id_set_name(sid, selem_name);
    elem = snd_mixer_find_selem(handle, sid);

    snd_mixer_selem_get_playback_volume_range(elem, &min, &max);
    snd_mixer_selem_get_playback_volume(elem, SND_MIXER_SCHN_FRONT_LEFT, &volume);
    snd_mixer_selem_get_playback_switch(elem, SND_MIXER_SCHN_FRONT_LEFT, &active);

    buf = xmalloc(10);
    if (active)
        snprintf(buf, 10, "%0.f%%", (double) volume / (double) max * 100);
    else
        snprintf(buf, 10, "off");

    snd_mixer_close(handle);

    return buf;
}

开发者ID:poljar，项目名称:sucktus，代码行数:34，代码来源:sucktus.c

示例8: snd_mixer_selem_id_malloc

static snd_mixer_elem_t *alsa_init_mixer_channel (const char *name,
		long *vol_min, long *vol_max)
{
	snd_mixer_selem_id_t *sid;
	snd_mixer_elem_t *elem = NULL;
	
	snd_mixer_selem_id_malloc (&sid);
	snd_mixer_selem_id_set_index (sid, 0);
	snd_mixer_selem_id_set_name (sid, name);

	if (!(elem = snd_mixer_find_selem(mixer_handle, sid)))
		error ("Can't find mixer %s", name);
	else if (!snd_mixer_selem_has_playback_volume(elem)) {
		error ("Mixer device has no playback volume (%s).", name);
		elem = NULL;
	}
	else {
		snd_mixer_selem_get_playback_volume_range (elem, vol_min,
				vol_max);
		logit ("Opened mixer (%s), volume range: %ld-%ld", name,
				*vol_min, *vol_max);
	}

	snd_mixer_selem_id_free (sid);

	return elem;
}

开发者ID:ecthiender，项目名称:mocp-git，代码行数:27，代码来源:alsa.c

示例9: set_volume

void set_volume(int vol)
{
	long min, max;
	snd_mixer_t *handlev;
	snd_mixer_selem_id_t *sid;
	const char *card = "default";
	const char *selem_name = "Master";

	if (vol < 1 || vol > 100) {
		printf("ERROR: Volume out of range [0,100] %%\n");
		printf("\tSetting volume to 50%%...\n");
		vol = 50;
	}

	snd_mixer_open(&handlev, 0);
	snd_mixer_attach(handlev, card);
	snd_mixer_selem_register(handlev, NULL, NULL);
	snd_mixer_load(handlev);

	snd_mixer_selem_id_alloca(&sid);
	snd_mixer_selem_id_set_index(sid, 0);
	snd_mixer_selem_id_set_name(sid, selem_name);
	snd_mixer_elem_t *elem = snd_mixer_find_selem(handlev, sid);

	snd_mixer_selem_get_playback_volume_range(elem, &min, &max);
	snd_mixer_selem_set_playback_volume_all(elem, vol * max / 100 + min);

	snd_mixer_close(handlev);
}

开发者ID:ivan-gomez，项目名称:drivers-gdl，代码行数:29，代码来源:player.c

示例10: min

SIDInfo::SIDInfo(snd_mixer_t* handle, snd_mixer_selem_id_t* sid) :
	min(0), max(0), globalMax(0), hasMute(false), hasVolume(false),
	_isEmulMuted(false), _lastVol(0), _handle(handle), _sid(sid)
{
	if (!_sid) return;

	snd_mixer_elem_t *elem;

	elem = snd_mixer_find_selem(_handle, _sid);

	if (!elem) return;

	if (snd_mixer_selem_has_playback_volume(elem))
	{
		snd_mixer_selem_get_playback_volume_range(elem, &min, &max);

		if (max > min) hasVolume = true;
		else min = max = 0;
	}

	_lastVol = min;

	if (snd_mixer_selem_has_playback_switch(elem))
	{
		hasMute = true;
	}
}

开发者ID:BackupTheBerlios，项目名称:lapsus-svn，代码行数:27，代码来源:alsa_mixer.cpp

示例11: get_volume

/**
 *  @brief Get the Volume for the master channel.
 *
 *    This function uses the Alsa API to get the volume
 *    for the master channel.
 *
 *  @param [out] ptr pointer to long, output will be between 0 and 99.
 *  @return Void.
 */
void get_volume(long *ptr){
  long min, max;
  snd_mixer_t *handle;
  snd_mixer_selem_id_t *sid;
  const char *card = "default";
  //const char *selem_name = "Master";
  const char *selem_name = "DAC2 Digital Course";

  snd_mixer_open(&handle, 0);
  snd_mixer_attach(handle, card);
  snd_mixer_selem_register(handle, NULL, NULL);
  snd_mixer_load(handle);

  snd_mixer_selem_id_alloca(&sid);
  snd_mixer_selem_id_set_index(sid, 0);
  snd_mixer_selem_id_set_name(sid, selem_name);
  snd_mixer_elem_t* elem = snd_mixer_find_selem(handle, sid);

  snd_mixer_selem_get_playback_volume_range(elem, &min, &max);
  printd("Volume range <%lu,%lu>\n", min, max);
  snd_mixer_selem_get_playback_volume(elem,0,ptr);
  printd("volume val = %lu\n",*ptr);
  *ptr /= (max / 100);
  snd_mixer_close(handle);
}

开发者ID:jsleeman，项目名称:Embedded-Group-Work，代码行数:34，代码来源:volume.c

示例12: SetAlsaSwitchMute

void SetAlsaSwitchMute(const char* card, const char* selem_name) {
    // long min, max;
    snd_mixer_t *handle;
    snd_mixer_selem_id_t *sid;

    snd_mixer_open(&handle, 0);
    snd_mixer_attach(handle, card);
    snd_mixer_selem_register(handle, NULL, NULL);
    snd_mixer_load(handle);

    snd_mixer_selem_id_alloca(&sid);
    snd_mixer_selem_id_set_index(sid, 0);
    snd_mixer_selem_id_set_name(sid, selem_name);
    snd_mixer_elem_t* elem = snd_mixer_find_selem(handle, sid);
    
    int* muted;
    snd_mixer_selem_channel_id_t channel;
    
    snd_mixer_selem_get_playback_switch(elem,channel,muted);
    printf("Muted: %d\n",*muted);	

    if (snd_mixer_selem_has_playback_switch(elem)) {
        snd_mixer_selem_set_playback_switch_all(elem, !*muted);
    }

    snd_mixer_close(handle);
}

开发者ID:V07D，项目名称:fbalsatray，代码行数:27，代码来源:volume.c

示例13: volume_up

int volume_up(int vol_min, int vol_max)
{
    long min, max;
    snd_mixer_t *handle;
    snd_mixer_selem_id_t *sid;
    const char *card = "default";
    const char *selem_name = "Master";


    snd_mixer_open(&handle, 0);
    snd_mixer_attach(handle, card);
    snd_mixer_selem_register(handle, NULL, NULL);
    snd_mixer_load(handle);

    snd_mixer_selem_id_alloca(&sid);
    snd_mixer_selem_id_set_index(sid, 0);
    snd_mixer_selem_id_set_name(sid, selem_name);
    snd_mixer_elem_t* elem = snd_mixer_find_selem(handle, sid);

    snd_mixer_selem_get_playback_volume_range(elem, &min, &max);
    
    for (int i = vol_min; i<vol_max; i++) {
      
      int v = i*max /100;
      snd_mixer_selem_set_playback_volume_all(elem, v);
      //printf("min = %d, max= %d, volume = %d\n", min, max, volume);
      usleep(50000);
    }
    snd_mixer_close(handle);
}

开发者ID:alg0hm，项目名称:7x7，代码行数:30，代码来源:volume.c

示例14: volume_set

int volume_set(int volume)
{
    long min, max;
    snd_mixer_t *handle;
    snd_mixer_selem_id_t *sid;
    const char *card = "default";
    //const char *selem_name = "Master";
    const char *selem_name = "Digital";


    snd_mixer_open(&handle, 0);
    snd_mixer_attach(handle, card);
    snd_mixer_selem_register(handle, NULL, NULL);
    snd_mixer_load(handle);

    snd_mixer_selem_id_alloca(&sid);
    snd_mixer_selem_id_set_index(sid, 0);
    snd_mixer_selem_id_set_name(sid, selem_name);
    snd_mixer_elem_t* elem = snd_mixer_find_selem(handle, sid);

    snd_mixer_selem_get_playback_volume_range(elem, &min, &max);
    
      
    int v = volume*max /100;
    snd_mixer_selem_set_playback_volume_all(elem, v);
    snd_mixer_close(handle);
    return v;
}

开发者ID:alg0hm，项目名称:7x7，代码行数:28，代码来源:volume.c

示例15: LOG

bool AlsaMixer::GetVolumePercent( const char* channel, int* value )
{
	LOG( Logger::LOG_DEBUG, "AlsaMixer::GetVolume( %s )", channel);
	bool success = false;
	snd_mixer_elem_t *elem;
	snd_mixer_selem_id_t *sid;
	snd_mixer_selem_id_alloca(&sid);

	snd_mixer_selem_id_set_index( sid, 0);
	snd_mixer_selem_id_set_name( sid, channel);
	elem = snd_mixer_find_selem(_handle, sid);
	if (!elem) {
		LOG( Logger::LOG_ERROR, "Unable to find simple control '%s',%i\n", snd_mixer_selem_id_get_name(sid), snd_mixer_selem_id_get_index(sid));
		goto end;
	}
	if( snd_mixer_selem_has_playback_volume(elem) )
	{
		long min, max;
		if( snd_mixer_selem_get_playback_volume_range(elem, &min, &max) < 0 )
		{
			LOG( Logger::LOG_ERROR, "Unable to get playback volume range for control '%s',%i\n", snd_mixer_selem_id_get_name(sid), snd_mixer_selem_id_get_index(sid));
			goto end;
		}
		long volume;
		for (int chn = 0; chn <= SND_MIXER_SCHN_LAST; chn++) {
			if (snd_mixer_selem_get_playback_volume(elem, (snd_mixer_selem_channel_id_t)chn, &volume ) >= 0)
			{
				*value = (volume - min) * 100 / ( max - min );
				success = true;
				break;
			}
		}
	}else if( snd_mixer_selem_has_capture_volume(elem) )
	{
		long min, max;
		if( snd_mixer_selem_get_capture_volume_range(elem, &min, &max) < 0 )
		{
			LOG( Logger::LOG_ERROR, "Unable to get capture volume range for control '%s',%i\n", snd_mixer_selem_id_get_name(sid), snd_mixer_selem_id_get_index(sid));
			goto end;
		}
		long volume;
		for (int chn = 0; chn <= SND_MIXER_SCHN_LAST; chn++) {
			if (snd_mixer_selem_get_capture_volume(elem, (snd_mixer_selem_channel_id_t)chn, &volume ) >= 0)
			{
				*value = (volume - min) * 100 / ( max - min );
				success = true;
				break;
			}
		}
	}
	if( !success )
	{
		LOG( Logger::LOG_ERROR, "Error getting control '%s',%i\n", snd_mixer_selem_id_get_name(sid), snd_mixer_selem_id_get_index(sid));
	}
 end:
	return success;
}

开发者ID:Schiiiiins，项目名称:lcu1，代码行数:57，代码来源:AlsaMixer.cpp

示例16: get_audio_volume

/*
 * originally from
 * stackoverflow.com/questions/7657624/get-master-sound-volume-in-c-in-linux
 */
static int get_audio_volume(MixSelect select, long* outvol) {
	int ret = 0;
	snd_mixer_t* handle;
	snd_mixer_elem_t* elem;
	snd_mixer_selem_id_t* sid;
	long minv, maxv;

	snd_mixer_selem_id_alloca(&sid);

	snd_mixer_selem_id_set_index(sid, select.mix_index);
	snd_mixer_selem_id_set_name(sid, select.mix_name);

	if ((snd_mixer_open(&handle, 0)) < 0) {
		return -1;
	}

	if ((snd_mixer_attach(handle, select.card)) < 0) {
		snd_mixer_close(handle);
		return -2;
	}

	if ((snd_mixer_selem_register(handle, NULL, NULL)) < 0) {
		snd_mixer_close(handle);
		return -3;
	}

	ret = snd_mixer_load(handle);

	if (ret < 0) {
		snd_mixer_close(handle);
		return -4;
	}

	elem = snd_mixer_find_selem(handle, sid);

	if (!elem) {
		snd_mixer_close(handle);
		return -5;
	}

	snd_mixer_selem_get_playback_volume_range(elem, &minv, &maxv);

	if(snd_mixer_selem_get_playback_volume(elem, 0, outvol) < 0) {
		snd_mixer_close(handle);
		return -6;
	}

	// make volume out of 100
	*outvol -= minv;
	maxv -= minv;
	minv = 0;
	*outvol = 100 * (*outvol) / maxv;

	snd_mixer_close(handle);
	return 0;
}

开发者ID:sliceofcode，项目名称:alsa_subscribe，代码行数:60，代码来源:asub.c

示例17: main

int
main(void) {
	Display *dpy;
	struct iwreq wreq;
	snd_mixer_t *handle;
	snd_mixer_elem_t *elem;
	snd_mixer_selem_id_t *vol_info;
	int sockfd, loops = 60;
	char *status, *mpd, *net, *vol, *bat, *clk;

	if(!(dpy = XOpenDisplay(NULL))) {
		fprintf(stderr, "dwmst: cannot open display.\n");
		exit(EXIT_FAILURE);
	}

	memset(&wreq, 0, sizeof(struct iwreq));
	snprintf(wreq.ifr_name, sizeof(WIRELESS_DEVICE), WIRELESS_DEVICE);
	sockfd = socket(AF_INET, SOCK_DGRAM, 0);

	snd_mixer_open(&handle, 0);
	snd_mixer_attach(handle, "default");
	snd_mixer_selem_register(handle, NULL, NULL);
	snd_mixer_load(handle);
	snd_mixer_selem_id_malloc(&vol_info);
	snd_mixer_selem_id_set_name(vol_info, VOL_CH);
	elem = snd_mixer_find_selem(handle, vol_info);
	if(elem == NULL) {
		fprintf(stderr, "dwmst: can not open device.\n");
		cleanup(dpy, sockfd, handle, vol_info);
		exit(EXIT_FAILURE);
	}

	for(;;sleep(INTERVAL)) {
		if(++loops > 60) {
			loops = 0;
			mpd = get_mpd();
			net = get_net(wreq, sockfd);
			bat = get_bat();
			clk = get_time();
		}
		vol = get_vol(handle, elem);
		status = smprintf("%s  %s  %s  %s  %s", mpd, net, vol, bat, clk);
		setstatus(dpy, status);
		free(vol);
		free(status);
	}

	free(mpd);
	free(net);
	free(bat);
	free(clk);
	cleanup(dpy, sockfd, handle, vol_info);
	exit(EXIT_SUCCESS);
}

开发者ID:Theta91，项目名称:dwmst，代码行数:54，代码来源:dwmst.c

示例18: alsactl_find_selem

static snd_mixer_elem_t* alsactl_find_selem(void* handle, char* name)
{
    snd_mixer_selem_id_t* sid;
    snd_mixer_selem_id_alloca(&sid);
    snd_mixer_selem_id_set_index(sid, 0);
    snd_mixer_selem_id_set_name(sid, name);

    snd_mixer_elem_t* elem = snd_mixer_find_selem((snd_mixer_t*)handle, sid);
    free(name); // was malloced from go src by C.CString()
    return elem;
}

开发者ID:networkimprov，项目名称:info-anvl，代码行数:11，代码来源:alsactl.c

示例19: snd_mixer_find_selem

bool SIDInfo::setRealVolume(long val)
{
	if (!hasVolume || !_sid) return false;

	snd_mixer_elem_t* elem = snd_mixer_find_selem(_handle, _sid);

	if (!elem) return false;

	snd_mixer_selem_set_playback_volume_all(elem, val);

	return true;
}

开发者ID:BackupTheBerlios，项目名称:lapsus-svn，代码行数:12，代码来源:alsa_mixer.cpp

示例20: eDebug

int eDVBVolumecontrol::openMixer()
{
#ifdef HAVE_ALSA
	if (!mainVolume)
	{
		int err;
		char *card = ALSA_CARD;

		eDebug("[eDVBVolumecontrol] Setup ALSA Mixer %s - %s", ALSA_CARD, ALSA_VOLUME_MIXER);
		/* Perform the necessary pre-amble to start up ALSA Mixer */
		err = snd_mixer_open(&alsaMixerHandle, 0);
		if (err < 0)
		{
			eDebug("Mixer %s open error: %s", card, snd_strerror(err));
			return err;
		}
		err = snd_mixer_attach(alsaMixerHandle, card);
		if (err < 0)
		{
			eDebug("Mixer attach %s error: %s", card, snd_strerror(err));
			snd_mixer_close(alsaMixerHandle);
			alsaMixerHandle = NULL;
			return err;
		}
		err = snd_mixer_selem_register(alsaMixerHandle, NULL, NULL);
		if (err < 0)
		{
			eDebug("Mixer register error: %s", snd_strerror(err));
			snd_mixer_close(alsaMixerHandle);
			alsaMixerHandle = NULL;
			return err;
		}
		err = snd_mixer_load(alsaMixerHandle);
		if (err < 0)
		{
			eDebug("Mixer %s load error: %s", card, snd_strerror(err));
			snd_mixer_close(alsaMixerHandle);
			alsaMixerHandle = NULL;
			return err;
		}

		/* Set up Decoder 0 as the main volume control. */
		snd_mixer_selem_id_t *sid;
		snd_mixer_selem_id_alloca(&sid);
		snd_mixer_selem_id_set_index(sid, 0);
		snd_mixer_selem_id_set_name(sid, "Master");
		mainVolume = snd_mixer_find_selem(alsaMixerHandle, sid);
	}
	return mainVolume ? 0 : -1;
#else
	return open( AUDIO_DEV, O_RDWR );
#endif
}

开发者ID:OpenLD，项目名称:enigma2-wetek，代码行数:53，代码来源:volume.cpp

注：本文中的snd_mixer_find_selem函数示例由纯净天空整理自Github/MSDocs等源码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。

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C++ snd_mixer_find_selem函数代码示例

示例1: snd_mixer_open

示例2: init_alsa

示例3: asound_set_channel

示例4: get_master_volume

示例5: snd_card_get_index

示例6: set_volume

示例7: snd_mixer_open

示例8: snd_mixer_selem_id_malloc

示例9: set_volume

示例10: min

示例11: get_volume

示例12: SetAlsaSwitchMute

示例13: volume_up

示例14: volume_set

示例15: LOG

示例16: get_audio_volume

示例17: main

示例18: alsactl_find_selem

示例19: snd_mixer_find_selem

示例20: eDebug

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