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C++ snd_ctl_open函数代码示例

原作者: [db:作者] 来自: [db:来源] 收藏 邀请

本文整理汇总了C++中snd_ctl_open函数的典型用法代码示例。如果您正苦于以下问题：C++ snd_ctl_open函数的具体用法？C++ snd_ctl_open怎么用？C++ snd_ctl_open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_ctl_open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: PORT_GetPortMixerCount

INT32 PORT_GetPortMixerCount() {
    INT32 mixerCount;
    int card;
    char devname[16];
    int err;
    snd_ctl_t *handle;
    snd_ctl_card_info_t* info;

    TRACE0("> PORT_GetPortMixerCount\n");

    initAlsaSupport();

    snd_ctl_card_info_malloc(&info);
    card = -1;
    mixerCount = 0;
    if (snd_card_next(&card) >= 0) {
        while (card >= 0) {
            sprintf(devname, ALSA_HARDWARE_CARD, card);
            TRACE1("PORT_GetPortMixerCount: Opening alsa device \"%s\"...\n", devname);
            err = snd_ctl_open(&handle, devname, 0);
            if (err < 0) {
                ERROR2("ERROR: snd_ctl_open, card=%d: %s\n", card, snd_strerror(err));
            } else {
                mixerCount++;
                snd_ctl_close(handle);
            }
            if (snd_card_next(&card) < 0) {
                break;
            }
        }
    }
    snd_ctl_card_info_free(info);
    TRACE0("< PORT_GetPortMixerCount\n");
    return mixerCount;
}
开发者ID:krichter722，项目名称:jdk9-jdk9-jdk，代码行数:35，代码来源:PLATFORM_API_LinuxOS_ALSA_Ports.c


示例2: PORT_GetPortMixerDescription

INT32 PORT_GetPortMixerDescription(INT32 mixerIndex, PortMixerDescription* description) {
    snd_ctl_t* handle;
    snd_ctl_card_info_t* card_info;
    char devname[16];
    int err;
    char buffer[100];

    TRACE0("> PORT_GetPortMixerDescription\n");
    snd_ctl_card_info_malloc(&card_info);

    sprintf(devname, ALSA_HARDWARE_CARD, (int) mixerIndex);
    TRACE1("Opening alsa device \"%s\"...\n", devname);
    err = snd_ctl_open(&handle, devname, 0);
    if (err < 0) {
        ERROR2("ERROR: snd_ctl_open, card=%d: %s\n", (int) mixerIndex, snd_strerror(err));
        return FALSE;
    }
    err = snd_ctl_card_info(handle, card_info);
    if (err < 0) {
        ERROR2("ERROR: snd_ctl_card_info, card=%d: %s\n", (int) mixerIndex, snd_strerror(err));
    }
    strncpy(description->name, snd_ctl_card_info_get_id(card_info), PORT_STRING_LENGTH - 1);
    sprintf(buffer, " [%s]", devname);
    strncat(description->name, buffer, PORT_STRING_LENGTH - 1 - strlen(description->name));
    strncpy(description->vendor, "ALSA (http://www.alsa-project.org)", PORT_STRING_LENGTH - 1);
    strncpy(description->description, snd_ctl_card_info_get_name(card_info), PORT_STRING_LENGTH - 1);
    strncat(description->description, ", ", PORT_STRING_LENGTH - 1 - strlen(description->description));
    strncat(description->description, snd_ctl_card_info_get_mixername(card_info), PORT_STRING_LENGTH - 1 - strlen(description->description));
    getALSAVersion(description->version, PORT_STRING_LENGTH - 1);

    snd_ctl_close(handle);
    snd_ctl_card_info_free(card_info);
    TRACE0("< PORT_GetPortMixerDescription\n");
    return TRUE;
}
开发者ID:krichter722，项目名称:jdk9-jdk9-jdk，代码行数:35，代码来源:PLATFORM_API_LinuxOS_ALSA_Ports.c


示例3: ALSA_AddUserSpecifiedDevice

/*----------------------------------------------------------------------------
** ALSA_AddUserSpecifiedDevice
**  Add a device given from the registry
*/
static int ALSA_AddUserSpecifiedDevice(const char *ctlname, const char *pcmname)
{
    int rc;
    int okay = 0;
    snd_ctl_t *ctl = NULL;
    snd_pcm_t *pcm = NULL;

    if (ctlname)
    {
        rc = snd_ctl_open(&ctl, ctlname, SND_CTL_NONBLOCK);
        if (rc < 0)
            ctl = NULL;
    }

    rc = snd_pcm_open(&pcm, pcmname, SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
    if (rc >= 0)
    {
        ALSA_AddPlaybackDevice(ctl, pcm, pcmname, FALSE);
        okay++;
        snd_pcm_close(pcm);
    }

    rc = snd_pcm_open(&pcm, pcmname, SND_PCM_STREAM_CAPTURE, SND_PCM_NONBLOCK);
    if (rc >= 0)
    {
        ALSA_AddCaptureDevice(ctl, pcm, pcmname, FALSE);
        okay++;
        snd_pcm_close(pcm);
    }

    if (ctl)
        snd_ctl_close(ctl);

    return (okay == 0);
}
开发者ID:mikekap，项目名称:wine，代码行数:39，代码来源:waveinit.c


示例4: while

    std::vector<String> AudioOutputDeviceAlsa::ParameterCard::PossibilitiesAsString(std::map<String,String> Parameters) {
        int err;
        std::vector<String> CardNames;

        // iterate through all cards
        int card_index = -1;
        while (snd_card_next(&card_index) >= 0 && card_index >= 0) {
            String hw_name = "hw:" + ToString(card_index);
            snd_ctl_t* hCardCtrl;
            if ((err = snd_ctl_open(&hCardCtrl, hw_name.c_str(), 0)) < 0) {
                std::cerr << "AudioOutputDeviceAlsa: Cannot open sound control for card " << card_index << " - " << snd_strerror(err) << std::endl;
                continue;
            }

            // iterate through all devices of that card
            int device_index = -1;
            while (!snd_ctl_pcm_next_device(hCardCtrl, &device_index) && device_index >= 0) {
                String name = ToString(card_index) + "," + ToString(device_index);
                //dmsg(1,("[possibility:%s]", name.c_str()));
                CardNames.push_back(name);
            }

            snd_ctl_close(hCardCtrl);
        }

        return CardNames;
    }
开发者ID:lxlxlo，项目名称:LS-linuxsampler，代码行数:27，代码来源:AudioOutputDeviceAlsa.cpp


示例5: search_device

static const char* search_device(void)
{
	int card, err;
	snd_hwdep_info_t* info;

	snd_hwdep_info_alloca(&info);
	card = -1;
	while (snd_card_next(&card) >= 0 && card >= 0) {
		char ctl_name[20];
		snd_ctl_t* ctl;
		int device;

		sprintf(ctl_name, "hw:CARD=%d", card);
		err = snd_ctl_open(&ctl, ctl_name, SND_CTL_NONBLOCK);
		if (err < 0)
			continue;
		device = -1;
		while (snd_ctl_hwdep_next_device(ctl, &device) >= 0 && device >= 0) {
			snd_hwdep_info_set_device(info, device);
			err = snd_ctl_hwdep_info(ctl, info);
			if (err >= 0 && snd_hwdep_info_get_iface(info) == SND_HWDEP_IFACE_SB_RC) {
				static char name[36];

				sprintf(name, "hw:CARD=%d,DEV=%d", card, device);
				snd_ctl_close(ctl);
				return name;
			}
		}
		snd_ctl_close(ctl);
	}
	return NULL;
}
开发者ID:andyvand，项目名称:LIRC，代码行数:32，代码来源:alsa_usb.c


示例6: scan_cycle

void scan_cycle(alsa_rawmidi_t *midi)
{
    int card = -1, err;
    scan_t scan;
    midi_port_t **ports;

    //debug_log("scan: cleanup");
    scan_cleanup(midi);

    scan.midi = midi;
    scan.iterator = &midi->scan.ports;
    snd_rawmidi_info_alloca(&scan.info);

    //debug_log("scan: rescan");
    while ((err = snd_card_next(&card))>=0 && card>=0) {
        char name[32];
        snprintf(name, sizeof(name), "hw:%d", card);
        if ((err = snd_ctl_open(&scan.ctl, name, SND_CTL_NONBLOCK))>=0) {
            scan_card(&scan);
            snd_ctl_close(scan.ctl);
        } else
            alsa_error("scan: snd_ctl_open", err);
    }

    // delayed open to workaround alsa<1.0.14 bug (can't open more than 1 subdevice if ctl is opened).
    ports = &midi->scan.ports;
    while (*ports) {
        midi_port_t *port = *ports;
        if (port->state == PORT_CREATED)
            ports = scan_port_open(midi, ports);
        else
            ports = &port->next;
    }
}
开发者ID:basilnut，项目名称:jack2，代码行数:34，代码来源:alsa_rawmidi.c


示例7: open_ctl

static int open_ctl(snd_use_case_mgr_t *uc_mgr,
		    snd_ctl_t **ctl,
		    const char *ctl_dev)
{
	int err;

	/* FIXME: add a list of ctl devices to uc_mgr structure and
           cache accesses for multiple opened ctl devices */
	if (uc_mgr->ctl_dev != NULL && strcmp(ctl_dev, uc_mgr->ctl_dev) == 0) {
		*ctl = uc_mgr->ctl;
		return 0;
	}
	if (uc_mgr->ctl_dev) {
		free(uc_mgr->ctl_dev);
		uc_mgr->ctl_dev = NULL;
		snd_ctl_close(uc_mgr->ctl);
		uc_mgr->ctl = NULL;
	
	}
	err = snd_ctl_open(ctl, ctl_dev, 0);
	if (err < 0)
		return err;
	uc_mgr->ctl_dev = strdup(ctl_dev);
	if (uc_mgr->ctl_dev == NULL) {
		snd_ctl_close(*ctl);
		return -ENOMEM;
	}
	uc_mgr->ctl = *ctl;
	return 0;
}
开发者ID:Blackrose，项目名称:mini2440-bsp，代码行数:30，代码来源:main.c


示例8: cards

static int cards(lua_State *lstate) {
	snd_ctl_t *handle;
	int ret, card, ord;
	char buf[32];
	snd_ctl_card_info_t *info;
	snd_ctl_card_info_alloca(&info);
	ord = 1;
	card = -1;
	lua_newtable(lstate);
	while (1) {
		if ((snd_card_next(&card) < 0) || (card < 0)) break;
		sprintf(buf, "hw:%d", card);
		if ((ret = snd_ctl_open(&handle, buf, 0)) < 0) {
			logmsg("control open: %s\n", snd_strerror(ret));
			continue;
			}
		if ((ret = snd_ctl_card_info(handle, info)) < 0) {
			logmsg("control info: %s\n", snd_strerror(ret));
			continue;
			}
		lua_pushinteger(lstate, ord++);
		lua_newtable(lstate);
		set_string(lstate, "dev", buf);
		set_string(lstate, "name",
				snd_ctl_card_info_get_name(info));
		lua_settable(lstate, -3);
		snd_ctl_close(handle);
		//view_card(buf);
		}
	return 1;
	}
开发者ID:pmyadlowsky，项目名称:mash，代码行数:31，代码来源:alsa.c


示例9: get_cards

/**
 * Partly based on get_cards function in alsamixer.
 * This gets all alsa cards and fills the global
 * GSList 'cards'.
 * The list always starts with the 'default' card.
 */
static void
get_cards(void)
{
    int err, num;
    snd_ctl_card_info_t *info;
    snd_ctl_t *ctl;
    char buf[10];
    struct acard *cur_card, *default_card;

    if (cards != NULL)
        g_slist_free_full(cards, card_free);

    cards = NULL;

    default_card = g_malloc(sizeof(struct acard));
    default_card->name = g_strdup("(default)");
    default_card->dev = g_strdup("default");
    default_card->channels = get_channels("default");

    cards = g_slist_append(cards, default_card);

    // don't need to free this as it's alloca'd
    snd_ctl_card_info_alloca(&info);
    num = -1;
    for (;;) {
        err = snd_card_next(&num);
        if (err < 0) {
            report_error("Can't get sounds cards: %s", snd_strerror(err));
            return;
        }
        if (num < 0)
            break;
        sprintf(buf, "hw:%d", num);
        if (snd_ctl_open(&ctl, buf, 0) < 0)
            continue;
        err = snd_ctl_card_info(ctl, info);
        snd_ctl_close(ctl);
        if (err < 0)
            continue;
        cur_card = g_malloc(sizeof(struct acard));
        cur_card->name = g_strdup(snd_ctl_card_info_get_name(info));
        sprintf(buf, "hw:%d", num);
        cur_card->dev = g_strdup(buf);
        cur_card->channels = get_channels(buf);
        cards = g_slist_append(cards, cur_card);
    }
#ifdef DEBUG
    GSList *tmp = cards;
    if (tmp) {
        printf("------ Card list ------\n");
        while (tmp) {
            struct acard *c = tmp->data;
            printf("\t%s\t%s\t%s\n", c->dev, c->name,
                   c->channels ? "" : "No chann");
            tmp = tmp->next;
        }
        printf("-----------------------\n");
    }
#endif
}
开发者ID:aarizkuren，项目名称:pnmixer，代码行数:66，代码来源:alsa.c


示例10: audio_set_default_levels

void audio_set_default_levels() {
  int err;
  snd_ctl_t *ctl;
  snd_ctl_elem_value_t *val;

  snd_ctl_elem_value_alloca(&val);

  if (snd_ctl_open(&ctl, ALSA_DEVICE, 0)) {
    fprintf(stderr, "can't open audio device");
    return;
  }

  /* unmute microphone */
  snd_ctl_elem_value_set_interface(val, SND_CTL_ELEM_IFACE_MIXER);
  snd_ctl_elem_value_set_name(val, "Mic Capture Switch");
  snd_ctl_elem_value_set_integer(val, 0, 1);
  err = snd_ctl_elem_write(ctl, val);
  if (err)
    fprintf(stderr, "can't unmute microphone: %s\n", snd_strerror(err));

  /* unmute speaker */
  snd_ctl_elem_value_clear(val);
  snd_ctl_elem_value_set_interface(val, SND_CTL_ELEM_IFACE_MIXER);
  snd_ctl_elem_value_set_name(val, "Speaker Playback Switch");
  snd_ctl_elem_value_set_integer(val, 0, 1);
  err = snd_ctl_elem_write(ctl, val);
  if (err)
    fprintf(stderr, "can't unmute speaker: %s\n", snd_strerror(err));

  /* set mic volume */
  snd_ctl_elem_value_clear(val);
  snd_ctl_elem_value_set_interface(val, SND_CTL_ELEM_IFACE_MIXER);
  snd_ctl_elem_value_set_name(val, "Mic Capture Volume");
  snd_ctl_elem_value_set_integer(val, 0, DEFAULT_MIC_VOL);
  err = snd_ctl_elem_write(ctl, val);
  if (err)
    fprintf(stderr, "can't set microphone volume: %s\n", snd_strerror(err));

  /* set speaker volume */
  snd_ctl_elem_value_clear(val);
  snd_ctl_elem_value_set_interface(val, SND_CTL_ELEM_IFACE_MIXER);
  snd_ctl_elem_value_set_name(val, "Speaker Playback Volume");
  snd_ctl_elem_value_set_integer(val, 0, DEFAULT_SPKR_VOL);
  snd_ctl_elem_value_set_integer(val, 1, DEFAULT_SPKR_VOL);
  err = snd_ctl_elem_write(ctl, val);
  if (err)
    fprintf(stderr, "can't set speaker volume: %s\n", snd_strerror(err));

  /* set capture source */
  snd_ctl_elem_value_clear(val);
  snd_ctl_elem_value_set_interface(val, SND_CTL_ELEM_IFACE_MIXER);
  snd_ctl_elem_value_set_name(val, "PCM Capture Source");
  snd_ctl_elem_value_set_integer(val, 0, 0);
  err = snd_ctl_elem_write(ctl, val);
  if (err)
    fprintf(stderr, "can't set capture source: %s\n", snd_strerror(err));

  snd_ctl_close(ctl);
}
开发者ID:sobkas，项目名称:usbrevue，代码行数:59，代码来源:audio.c


示例11: main

int main(int argc, char **argv)
{
   register int  err;
   int           cardNum;

   // Start with first card
   cardNum = -1;

   for (;;)
   {
      snd_ctl_t *cardHandle;

      // Get next sound card's card number. When "cardNum" == -1, then ALSA
      // fetches the first card
      if ((err = snd_card_next(&cardNum)) < 0)
      {
         printf("Can't get the next card number: %s\n", snd_strerror(err));
         break;
      }

      // No more cards? ALSA sets "cardNum" to -1 if so
      if (cardNum < 0) break;

      // Open this card's control interface. We specify only the card number -- not
      // any device nor sub-device too
      {
      char   str[64];

      sprintf(str, "hw:%i", cardNum);
      if ((err = snd_ctl_open(&cardHandle, str, 0)) < 0)
      {
         printf("Can't open card %i: %s\n", cardNum, snd_strerror(err));
         continue;
      }
      }

      {
      snd_ctl_card_info_t *cardInfo;

      // We need to get a snd_ctl_card_info_t. Just alloc it on the stack
      snd_ctl_card_info_alloca(&cardInfo);

      // Tell ALSA to fill in our snd_ctl_card_info_t with info about this card
      if ((err = snd_ctl_card_info(cardHandle, cardInfo)) < 0)
         printf("Can't get info for card %i: %s\n", cardNum, snd_strerror(err));
      else
         printf("Card %i = %s\n", cardNum, snd_ctl_card_info_get_name(cardInfo));
      }

      // Close the card's control interface after we're done with it
      snd_ctl_close(cardHandle);
   }

   // ALSA allocates some mem to load its config file when we call some of the
   // above functions. Now that we're done getting the info, let's tell ALSA
   // to unload the info and free up that mem
   snd_config_update_free_global();
}
开发者ID:Ku-Al，项目名称:distanceplay，代码行数:58，代码来源:card.c


示例12: snd_ctl_card_info_alloca

static char *ListAvailableDevices( demux_t *p_demux, bool b_probe )
{
    snd_ctl_card_info_t *p_info = NULL;
    snd_ctl_card_info_alloca( &p_info );

    snd_pcm_info_t *p_pcminfo = NULL;
    snd_pcm_info_alloca( &p_pcminfo );

    if( !b_probe )
        msg_Dbg( p_demux, "Available alsa capture devices:" );
    int i_card = -1;
    while( !snd_card_next( &i_card ) && i_card >= 0 )
    {
        char psz_devname[10];
        snprintf( psz_devname, 10, "hw:%d", i_card );

        snd_ctl_t *p_ctl = NULL;
        if( snd_ctl_open( &p_ctl, psz_devname, 0 ) < 0 ) continue;

        snd_ctl_card_info( p_ctl, p_info );
        if( !b_probe )
            msg_Dbg( p_demux, "  %s (%s)",
                     snd_ctl_card_info_get_id( p_info ),
                     snd_ctl_card_info_get_name( p_info ) );

        int i_dev = -1;
        while( !snd_ctl_pcm_next_device( p_ctl, &i_dev ) && i_dev >= 0 )
        {
            snd_pcm_info_set_device( p_pcminfo, i_dev );
            snd_pcm_info_set_subdevice( p_pcminfo, 0 );
            snd_pcm_info_set_stream( p_pcminfo, SND_PCM_STREAM_CAPTURE );
            if( snd_ctl_pcm_info( p_ctl, p_pcminfo ) < 0 ) continue;

            if( !b_probe )
                msg_Dbg( p_demux, "    hw:%d,%d : %s (%s)", i_card, i_dev,
                         snd_pcm_info_get_id( p_pcminfo ),
                         snd_pcm_info_get_name( p_pcminfo ) );
            else
            {
                char *psz_device;
                if( asprintf( &psz_device, "hw:%d,%d", i_card, i_dev ) > 0 )
                {
                    if( ProbeAudioDevAlsa( p_demux, psz_device ) )
                    {
                        snd_ctl_close( p_ctl );
                        return psz_device;
                    }
                    else
                        free( psz_device );
                }
            }
        }

        snd_ctl_close( p_ctl );
    }
    return NULL;
}
开发者ID:Italianmoose，项目名称:Stereoscopic-VLC，代码行数:57，代码来源:alsa.c


示例13: snd_ctl_card_info_alloca

bool MainWindowImpl::FindRadioshark(string& device)
{
	int card = -1;
	int dev = -1;
	
	snd_ctl_t *handle = NULL;
	snd_ctl_card_info_t *info = NULL;
	snd_pcm_info_t *pcminfo = NULL;
	snd_pcm_stream_t stream = SND_PCM_STREAM_CAPTURE;
	char card_id[32];
	char *name = NULL;

	snd_ctl_card_info_alloca (&info);
	snd_pcm_info_alloca (&pcminfo);

	if (snd_card_next (&card) < 0 || card < 0)
	{
		return false;
	}
	while(card >= 0)
	{
		snprintf (card_id, 32, "hw:%d", card);
		if (snd_ctl_open (&handle, card_id, 0) == 0)
		{
			snd_ctl_card_info (handle, info);
			while (1)
			{
				snd_ctl_pcm_next_device (handle, &dev);
				if (dev < 0){
					break;
				}
				snd_pcm_info_set_device (pcminfo, dev);
				snd_pcm_info_set_subdevice (pcminfo, 0);
				snd_pcm_info_set_stream (pcminfo, stream);
	
				if (snd_ctl_pcm_info (handle, pcminfo) >= 0)
				{
					snd_card_get_name (card, &name);
					if(strncmp(name,"radioSHARK",32) == 0)
					{void PokeScreensaver(void);
						snd_ctl_close(handle);
						free (name);
						snprintf (card_id, 32, "hw:%d,%d", card,dev);
						device = string(card_id);
						return true;
					}
					free (name);
				}
			}
			snd_ctl_close(handle);
		}
		snd_card_next (&card);
	}
	return false;//didn't find the proper Radioshark card.
}
开发者ID:RyanNerd，项目名称:finny，代码行数:55，代码来源:mainwindowimpl.cpp


示例14: deviceList

static void deviceList(int type, vector_DevMap *devmap)
{
    snd_ctl_t* handle;
    snd_pcm_info_t pcminfo;
    int max_cards, card, err, dev;
    DevMap entry;
    char name[1024];
    struct snd_ctl_hw_info info;
    void* temp;

    max_cards = snd_cards();
    if(max_cards < 0)
        return;

    VECTOR_RESERVE(*devmap, max_cards+1);
    VECTOR_RESIZE(*devmap, 0);

    entry.name = strdup(qsaDevice);
    entry.card = 0;
    entry.dev = 0;
    VECTOR_PUSH_BACK(*devmap, entry);

    for(card = 0;card < max_cards;card++)
    {
        if((err=snd_ctl_open(&handle, card)) < 0)
            continue;

        if((err=snd_ctl_hw_info(handle, &info)) < 0)
        {
            snd_ctl_close(handle);
            continue;
        }

        for(dev = 0;dev < (int)info.pcmdevs;dev++)
        {
            if((err=snd_ctl_pcm_info(handle, dev, &pcminfo)) < 0)
                continue;

            if((type==SND_PCM_CHANNEL_PLAYBACK && (pcminfo.flags&SND_PCM_INFO_PLAYBACK)) ||
               (type==SND_PCM_CHANNEL_CAPTURE && (pcminfo.flags&SND_PCM_INFO_CAPTURE)))
            {
                snprintf(name, sizeof(name), "%s [%s] (hw:%d,%d)", info.name, pcminfo.name, card, dev);
                entry.name = strdup(name);
                entry.card = card;
                entry.dev = dev;

                VECTOR_PUSH_BACK(*devmap, entry);
                TRACE("Got device \"%s\", card %d, dev %d\n", name, card, dev);
            }
        }
        snd_ctl_close(handle);
    }
}
开发者ID:Sponk，项目名称:NeoEditor，代码行数:53，代码来源:qsa.c


示例15: snd_ctl_card_info_alloca

std::vector<HwIDPair>
AlsaLayer::getAudioDeviceIndexMap(bool getCapture) const
{
    snd_ctl_t* handle;
    snd_ctl_card_info_t *info;
    snd_pcm_info_t* pcminfo;
    snd_ctl_card_info_alloca(&info);
    snd_pcm_info_alloca(&pcminfo);

    int numCard = -1;

    std::vector<HwIDPair> audioDevice;

    if (snd_card_next(&numCard) < 0 || numCard < 0)
        return audioDevice;

    do {
        std::stringstream ss;
        ss << numCard;
        std::string name = "hw:" + ss.str();

        if (snd_ctl_open(&handle, name.c_str(), 0) == 0) {
            if (snd_ctl_card_info(handle, info) == 0) {
                snd_pcm_info_set_device(pcminfo, 0);
                snd_pcm_info_set_stream(pcminfo, getCapture ? SND_PCM_STREAM_CAPTURE : SND_PCM_STREAM_PLAYBACK);

                int err;

                if ((err = snd_ctl_pcm_info(handle, pcminfo)) < 0) {
                    WARN("Cannot get info for %s %s: %s", getCapture ?
                         "capture device" : "playback device", name.c_str(),
                         snd_strerror(err));
                } else {
                    DEBUG("card %i : %s [%s]",
                          numCard,
                          snd_ctl_card_info_get_id(info),
                          snd_ctl_card_info_get_name(info));
                    std::string description = snd_ctl_card_info_get_name(info);
                    description.append(" - ");
                    description.append(snd_pcm_info_get_name(pcminfo));

                    // The number of the sound card is associated with a string description
                    audioDevice.push_back(HwIDPair(numCard, description));
                }
            }

            snd_ctl_close(handle);
        }
    } while (snd_card_next(&numCard) >= 0 && numCard >= 0);


    return audioDevice;
}
开发者ID:ThereIsNoYeti，项目名称:sflphone，代码行数:53，代码来源:alsalayer.cpp


示例16: snd_hctl_open

/**
 * \brief Opens an HCTL
 * \param hctlp Returned HCTL handle
 * \param name ASCII identifier of the underlying CTL handle
 * \param mode Open mode (see #SND_CTL_NONBLOCK, #SND_CTL_ASYNC)
 * \return 0 on success otherwise a negative error code
 */
int snd_hctl_open(snd_hctl_t **hctlp, const char *name, int mode)
{
	snd_ctl_t *ctl;
	int err;
	
	if ((err = snd_ctl_open(&ctl, name, mode)) < 0)
		return err;
	err = snd_hctl_open_ctl(hctlp, ctl);
	if (err < 0)
		snd_ctl_close(ctl);
	return err;
}
开发者ID:OpenSmalltalk，项目名称:opensmalltalk-vm，代码行数:19，代码来源:hcontrol.c


示例17: ags_devout_list_cards

/**
 * ags_devout_list_cards:
 * @soundcard: the #AgsSoundcard
 * @card_id: alsa identifier
 * @card_name: card name
 *
 * List available soundcards.
 *
 * Since: 0.4
 */
void
ags_devout_list_cards(AgsSoundcard *soundcard,
		      GList **card_id, GList **card_name)
{
  snd_ctl_t *card_handle;
  snd_ctl_card_info_t *card_info;
  char *name;
  gchar *str;
  int card_num;
  int error;

  *card_id = NULL;
  *card_name = NULL;
  card_num = -1;

  while(TRUE){
    error = snd_card_next(&card_num);

    if(card_num < 0){
      break;
    }

    if(error < 0){
      continue;
    }

    str = g_strdup_printf("hw:%i\0", card_num);
    error = snd_ctl_open(&card_handle, str, 0);

    if(error < 0){
      continue;
    }

    snd_ctl_card_info_alloca(&card_info);
    error = snd_ctl_card_info(card_handle, card_info);

    if(error < 0){
      continue;
    }

    *card_id = g_list_prepend(*card_id, str);
    *card_name = g_list_prepend(*card_name, g_strdup(snd_ctl_card_info_get_name(card_info)));

    snd_ctl_close(card_handle);
  }

  snd_config_update_free_global();

  *card_id = g_list_reverse(*card_id);
  *card_name = g_list_reverse(*card_name);
}
开发者ID:joelkraehemann，项目名称:gsequencer，代码行数:61，代码来源:ags_devout.c


示例18: get_gain

int get_gain(int idx, int src, int dst)
{
  int err;
  int val = HDSPMM_ERROR_NO_CARD;

  snd_ctl_elem_id_t *id;
  snd_ctl_elem_value_t *ctl;
  snd_ctl_t *handle;

  if(idx >= HDSPMM_MAX_CARDS || idx < 0)
	return HDSPMM_ERROR_WRONG_IDX;


  snd_ctl_elem_value_alloca(&ctl);
  snd_ctl_elem_id_alloca(&id);
  snd_ctl_elem_id_set_name(id, "Mixer");
  snd_ctl_elem_id_set_numid(id, 0);
  snd_ctl_elem_id_set_interface(id, SND_CTL_ELEM_IFACE_HWDEP);
  snd_ctl_elem_id_set_device(id, 0);
  snd_ctl_elem_id_set_subdevice(id, 0);
  snd_ctl_elem_id_set_index(id, 0);
  snd_ctl_elem_value_set_id(ctl, id);

  if ((err = snd_ctl_open(&handle, card_name[cardid], SND_CTL_NONBLOCK)) < 0) {
#ifndef QUIET
    fprintf(stderr, "Alsa error: %s\n", snd_strerror(err));
#endif
    return HDSPMM_ERROR_ALSA_OPEN;
  }

  snd_ctl_elem_value_set_integer(ctl, 0, src);
  snd_ctl_elem_value_set_integer(ctl, 1, dst);

  if ((err = snd_ctl_elem_read(handle, ctl)) < 0) {
#ifndef QUIET
    fprintf(stderr, "Alsa error: %s\n", snd_strerror(err));
#endif
    return HDSPMM_ERROR_ALSA_READ;
  }
  val = snd_ctl_elem_value_get_integer(ctl, 2);

  snd_ctl_close(handle);

  return val;
  
  SETFLOAT(x->x_at+1, delta);
  SETFLOAT(x->x_at+2, phi);
  outlet_list(x->x_out_para, &s_list, 3, x->x_at);
  outlet_anything(x->x_obj.ob_outlet, s, x->x_size2d+1, x->x_at);
}
开发者ID:IcaroL2ORK，项目名称:pd，代码行数:50，代码来源:hdspm_mixer.c


示例19: set_gain

int set_gain(int idx, int src, int dst, int val)
{
  int err;


  snd_ctl_elem_id_t *id;
  snd_ctl_elem_value_t *ctl;
  snd_ctl_t *handle;

  if(idx >= HDSPMM_MAX_CARDS || idx < 0)
	return HDSPMM_ERROR_WRONG_IDX;

  snd_ctl_elem_value_alloca(&ctl);
  snd_ctl_elem_id_alloca(&id);
  snd_ctl_elem_id_set_name(id, "Mixer");
  snd_ctl_elem_id_set_numid(id, 0);
  snd_ctl_elem_id_set_interface(id, SND_CTL_ELEM_IFACE_HWDEP);
  snd_ctl_elem_id_set_device(id, 0);
  snd_ctl_elem_id_set_subdevice(id, 0);
  snd_ctl_elem_id_set_index(id, 0);
  snd_ctl_elem_value_set_id(ctl, id);

  if ((err = snd_ctl_open(&handle, card_name[idx], SND_CTL_NONBLOCK)) < 0) {
#ifndef QUIET
    fprintf(stderr, "Alsa error: %s\n", snd_strerror(err));
#endif
    return HDSPMM_ERROR_ALSA_OPEN;
  }

  snd_ctl_elem_value_set_integer(ctl, 0, src);
  snd_ctl_elem_value_set_integer(ctl, 1, dst);
  snd_ctl_elem_value_set_integer(ctl, 2, val);

  if ((err = snd_ctl_elem_write(handle, ctl)) < 0) {
#ifndef QUIET
    fprintf(stderr, "Alsa error: %s\n", snd_strerror(err));
#endif
    return HDSPMM_ERROR_ALSA_WRITE;
  }

  val = snd_ctl_elem_value_get_integer(ctl, 2);

  snd_ctl_close(handle);
  return val;
}
开发者ID:IcaroL2ORK，项目名称:pd，代码行数:45，代码来源:hdspm_mixer.c


示例20: open_ctl

static int open_ctl(const char *name, snd_ctl_t **ctlp)
{
    snd_ctl_t *ctl;

    if (snd_ctl_open(&ctl, name, SND_CTL_READONLY) < 0) {
        fprintf(stderr, "Cannot open ctl %s\n", name);
        return 1;
    }

    if (snd_ctl_subscribe_events(ctl, 1) < 0) {
        fprintf(stderr, "Cannot open subscribe events to ctl %s\n", name);
        snd_ctl_close(ctl);
        return 1;
    }

    *ctlp = ctl;
    return 0;
}
开发者ID:polter-rnd，项目名称:y50-subwoofer，代码行数:18，代码来源:y50-subwoofer.c



注：本文中的snd_ctl_open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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