当前位置: 首页>>代码示例>>C++>>正文

C++ snd_pcm_status函数代码示例

本文整理汇总了C++中snd_pcm_status函数的典型用法代码示例。如果您正苦于以下问题：C++ snd_pcm_status函数的具体用法？C++ snd_pcm_status怎么用？C++ snd_pcm_status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_pcm_status函数的15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，您的评价将有助于系统推荐出更棒的C++代码示例。

示例1: snd_pcm_writei

// TODO first frame causes broken pipe (underrun) because not enough data is sent
// we should wait until the handle is ready
void
AlsaLayer::write(SFLAudioSample* buffer, int frames, snd_pcm_t * handle)
{
    // Skip empty buffers
    if (!frames)
        return;

    int err = snd_pcm_writei(handle, (const void*)buffer, frames);

    if (err < 0)
        snd_pcm_recover(handle, err, 0);

    if (err >= 0)
        return;

    switch (err) {

        case -EPIPE:
        case -ESTRPIPE:
        case -EIO: {
            snd_pcm_status_t* status;
            snd_pcm_status_alloca(&status);

            if (ALSA_CALL(snd_pcm_status(handle, status), "Cannot get playback handle status") >= 0)
                if (snd_pcm_status_get_state(status) == SND_PCM_STATE_XRUN) {
                    stopPlaybackStream();
                    preparePlaybackStream();
                    startPlaybackStream();
                }

            ALSA_CALL(snd_pcm_writei(handle, (const void*)buffer, frames), "XRUN handling failed");
            break;
        }

        case -EBADFD: {
            snd_pcm_status_t* status;
            snd_pcm_status_alloca(&status);

            if (ALSA_CALL(snd_pcm_status(handle, status), "Cannot get playback handle status") >= 0) {
                if (snd_pcm_status_get_state(status) == SND_PCM_STATE_SETUP) {
                    ERROR("Writing in state SND_PCM_STATE_SETUP, should be "
                          "SND_PCM_STATE_PREPARED or SND_PCM_STATE_RUNNING");
                    int error = snd_pcm_prepare(handle);

                    if (error < 0) {
                        ERROR("Failed to prepare handle: %s", snd_strerror(error));
                        stopPlaybackStream();
                    }
                }
            }

            break;
        }

        default:
            ERROR("Unknown write error, dropping frames: %s", snd_strerror(err));
            stopPlaybackStream();
            break;
    }
}
开发者ID:ThereIsNoYeti，项目名称:sflphone，代码行数:62，代码来源:alsalayer.cpp

示例2: gst_alsasrc_get_timestamp

static GstClockTime
gst_alsasrc_get_timestamp (GstAlsaSrc * asrc)
{
  snd_pcm_status_t *status;
  snd_htimestamp_t tstamp;
  GstClockTime timestamp;
  snd_pcm_uframes_t avail;
  gint err = -EPIPE;

  if (G_UNLIKELY (!asrc)) {
    GST_ERROR_OBJECT (asrc, "No alsa handle created yet !");
    return GST_CLOCK_TIME_NONE;
  }

  if (G_UNLIKELY (snd_pcm_status_malloc (&status) != 0)) {
    GST_ERROR_OBJECT (asrc, "snd_pcm_status_malloc failed");
    return GST_CLOCK_TIME_NONE;
  }

  if (G_UNLIKELY (snd_pcm_status (asrc->handle, status) != 0)) {
    GST_ERROR_OBJECT (asrc, "snd_pcm_status failed");
    return GST_CLOCK_TIME_NONE;
  }

  /* in case an xrun condition has occured we need to handle this */
  if (snd_pcm_status_get_state (status) != SND_PCM_STATE_RUNNING) {
    if (xrun_recovery (asrc, asrc->handle, err) < 0) {
      GST_WARNING_OBJECT (asrc, "Could not recover from xrun condition !");
    }
    /* reload the status alsa status object, since recovery made it invalid */
    if (G_UNLIKELY (snd_pcm_status (asrc->handle, status) != 0)) {
      GST_ERROR_OBJECT (asrc, "snd_pcm_status failed");
    }
  }

  /* get high resolution time stamp from driver */
  snd_pcm_status_get_htstamp (status, &tstamp);
  timestamp = GST_TIMESPEC_TO_TIME (tstamp);

  /* max available frames sets the depth of the buffer */
  avail = snd_pcm_status_get_avail (status);

  /* calculate the timestamp of the next sample to be read */
  timestamp -= gst_util_uint64_scale_int (avail, GST_SECOND, asrc->rate);

  /* compensate for the fact that we really need the timestamp of the
   * previously read data segment */
  timestamp -= asrc->period_time * 1000;

  snd_pcm_status_free (status);

  GST_LOG_OBJECT (asrc, "ALSA timestamp : %" GST_TIME_FORMAT
      ", delay %lu", GST_TIME_ARGS (timestamp), avail);

  return timestamp;
}
开发者ID:Distrotech，项目名称:gst-plugins-base，代码行数:56，代码来源:gstalsasrc.c

示例3: ai_alsa_xrun

int ai_alsa_xrun(audio_in_t *ai)
{
    snd_pcm_status_t *status;
    int res;

    snd_pcm_status_alloca(&status);
    if ((res = snd_pcm_status(ai->alsa.handle, status))<0) {
	mp_tmsg(MSGT_TV, MSGL_ERR, "ALSA status error: %s", snd_strerror(res));
	return -1;
    }
    if (snd_pcm_status_get_state(status) == SND_PCM_STATE_XRUN) {
	struct timeval now, diff, tstamp;
	gettimeofday(&now, 0);
	snd_pcm_status_get_trigger_tstamp(status, &tstamp);
	timersub(&now, &tstamp, &diff);
	mp_tmsg(MSGT_TV, MSGL_ERR, "ALSA xrun!!! (at least %.3f ms long)\n",
	       diff.tv_sec * 1000 + diff.tv_usec / 1000.0);
	if (mp_msg_test(MSGT_TV, MSGL_V)) {
	    mp_tmsg(MSGT_TV, MSGL_ERR, "ALSA Status:\n");
	    snd_pcm_status_dump(status, ai->alsa.log);
	}
	if ((res = snd_pcm_prepare(ai->alsa.handle))<0) {
	    mp_tmsg(MSGT_TV, MSGL_ERR, "ALSA xrun: prepare error: %s", snd_strerror(res));
	    return -1;
	}
	return 0;		/* ok, data should be accepted again */
    }
    mp_tmsg(MSGT_TV, MSGL_ERR, "ALSA read/write error");
    return -1;
}
开发者ID:ArcherSeven，项目名称:mpv，代码行数:30，代码来源:ai_alsa1x.c

示例4: snd_pcm_status_user_compat

static int snd_pcm_status_user_compat(struct snd_pcm_substream *substream,
				      struct snd_pcm_status32 __user *src)
{
	struct snd_pcm_status status;
	int err;

	err = snd_pcm_status(substream, &status);
	if (err < 0)
		return err;

	if (put_user(status.state, &src->state) ||
	    put_user(status.trigger_tstamp.tv_sec, &src->trigger_tstamp.tv_sec) ||
	    put_user(status.trigger_tstamp.tv_nsec, &src->trigger_tstamp.tv_nsec) ||
	    put_user(status.tstamp.tv_sec, &src->tstamp.tv_sec) ||
	    put_user(status.tstamp.tv_nsec, &src->tstamp.tv_nsec) ||
	    put_user(status.appl_ptr, &src->appl_ptr) ||
	    put_user(status.hw_ptr, &src->hw_ptr) ||
	    put_user(status.delay, &src->delay) ||
	    put_user(status.avail, &src->avail) ||
	    put_user(status.avail_max, &src->avail_max) ||
	    put_user(status.overrange, &src->overrange) ||
	    put_user(status.suspended_state, &src->suspended_state))
		return -EFAULT;

	return err;
}
开发者ID:Core2idiot，项目名称:Kernel-Samsung-3.0...-，代码行数:26，代码来源:pcm_compat.c

示例5: snd_pcm_dmix_status

static int snd_pcm_dmix_status(snd_pcm_t *pcm, snd_pcm_status_t * status)
{
	snd_pcm_direct_t *dmix = pcm->private_data;

	memset(status, 0, sizeof(*status));
	snd_pcm_status(dmix->spcm, status);

	switch (dmix->state) {
	case SNDRV_PCM_STATE_DRAINING:
	case SNDRV_PCM_STATE_RUNNING:
		snd_pcm_dmix_sync_ptr0(pcm, status->hw_ptr);
		status->delay += snd_pcm_mmap_playback_delay(pcm)
				+ status->avail - dmix->spcm->buffer_size;
		break;
	default:
		break;
	}

	status->state = snd_pcm_dmix_state(pcm);
	status->trigger_tstamp = dmix->trigger_tstamp;
	status->avail = snd_pcm_mmap_playback_avail(pcm);
	status->avail_max = status->avail > dmix->avail_max ? status->avail : dmix->avail_max;
	dmix->avail_max = 0;
	return 0;
}
开发者ID:Boshin，项目名称:workspace，代码行数:25，代码来源:pcm_dmix.c

示例6: ai_alsa_xrun

int ai_alsa_xrun(audio_in_t *ai)
{
    snd_pcm_status_t *status;
    int res;

    snd_pcm_status_alloca(&status);
    if ((res = snd_pcm_status(ai->alsa.handle, status))<0) {
	mp_msg(MSGT_TV, MSGL_ERR, MSGTR_MPDEMUX_AIALSA_AlsaStatusError, snd_strerror(res));
	return -1;
    }
    if (snd_pcm_status_get_state(status) == SND_PCM_STATE_XRUN) {
	struct timeval now, diff, tstamp;
	gettimeofday(&now, 0);
	snd_pcm_status_get_trigger_tstamp(status, &tstamp);
	timersub(&now, &tstamp, &diff);
	mp_msg(MSGT_TV, MSGL_ERR, MSGTR_MPDEMUX_AIALSA_AlsaXRUN,
	       diff.tv_sec * 1000 + diff.tv_usec / 1000.0);
	if (mp_msg_test(MSGT_TV, MSGL_V)) {
	    mp_msg(MSGT_TV, MSGL_ERR, "ALSA Status:\n");
	    snd_pcm_status_dump(status, ai->alsa.log);
	}
	if ((res = snd_pcm_prepare(ai->alsa.handle))<0) {
	    mp_msg(MSGT_TV, MSGL_ERR, MSGTR_MPDEMUX_AIALSA_AlsaXRUNPrepareError, snd_strerror(res));
	    return -1;
	}
	return 0;		/* ok, data should be accepted again */
    }
    mp_msg(MSGT_TV, MSGL_ERR, MSGTR_MPDEMUX_AIALSA_AlsaReadWriteError);
    return -1;
}
开发者ID:Newbleeto，项目名称:mplayer-tegra，代码行数:30，代码来源:ai_alsa.c

示例7: xrun

// I/O error handler
static void xrun(void)
{
	snd_pcm_status_t *status;
	int res;
	
	snd_pcm_status_alloca(&status);
	if ((res = snd_pcm_status(handle, status))<0) {
		error(_("status error: %s"), snd_strerror(res));
		exit(EXIT_FAILURE);
	}
	if (snd_pcm_status_get_state(status) == SND_PCM_STATE_XRUN) {
		struct timeval now, diff, tstamp;
		gettimeofday(&now, 0);
		snd_pcm_status_get_trigger_tstamp(status, &tstamp);
		timersub(&now, &tstamp, &diff);
		fprintf(stderr, _("%s!!! (at least %.3f ms long)\n"),
			stream == SND_PCM_STREAM_PLAYBACK ? _("underrun") : _("overrun"),
			diff.tv_sec * 1000 + diff.tv_usec / 1000.0);
		if ((res = snd_pcm_prepare(handle))<0) {
			error(_("xrun: prepare error: %s"), snd_strerror(res));
			exit(EXIT_FAILURE);
		}
		return;		// ok, data should be accepted again
	} if (snd_pcm_status_get_state(status) == SND_PCM_STATE_DRAINING) {
	}
	error(_("read/write error, state = %s"), snd_pcm_state_name(snd_pcm_status_get_state(status)));
	exit(EXIT_FAILURE);
}
开发者ID:hishamhm，项目名称:protosampler，代码行数:29，代码来源:play.c

示例8: snd_pcm_status_user_compat

static int snd_pcm_status_user_compat(struct snd_pcm_substream *substream,
				      struct snd_pcm_status32 __user *src)
{
	struct snd_pcm_status status;
	int err;

	err = snd_pcm_status(substream, &status);
	if (err < 0)
		return err;

	if (clear_user(src, sizeof(*src)))
		return -EFAULT;
	if (put_user(status.state, &src->state) ||
	    compat_put_timespec(&status.trigger_tstamp, &src->trigger_tstamp) ||
	    compat_put_timespec(&status.tstamp, &src->tstamp) ||
	    put_user(status.appl_ptr, &src->appl_ptr) ||
	    put_user(status.hw_ptr, &src->hw_ptr) ||
	    put_user(status.delay, &src->delay) ||
	    put_user(status.avail, &src->avail) ||
	    put_user(status.avail_max, &src->avail_max) ||
	    put_user(status.overrange, &src->overrange) ||
	    put_user(status.suspended_state, &src->suspended_state) ||
	    compat_put_timespec(&status.audio_tstamp, &src->audio_tstamp))
		return -EFAULT;

	return err;
}
开发者ID:Menpiko，项目名称:SnaPKernel-N6P，代码行数:27，代码来源:pcm_compat.c

示例9: xrun

static void
xrun(void)
{
  snd_pcm_status_t *status;
  int             res;

  snd_pcm_status_alloca(&status);
  if ((res = snd_pcm_status(AHandle, status)) < 0) {
    fprintf(stderr, "status error: %s", snd_strerror(res));
    exit(EXIT_FAILURE);
  }
  if (snd_pcm_status_get_state(status) == SND_PCM_STATE_XRUN) {
    struct timeval  now,
                    diff,
                    tstamp;
    gettimeofday(&now, 0);
    snd_pcm_status_get_trigger_tstamp(status, &tstamp);
    timersub(&now, &tstamp, &diff);
    fprintf(stderr, "Underrun!!! (at least %.3f ms long)\n",
            diff.tv_sec * 1000 + diff.tv_usec / 1000.0);
    if ((res = snd_pcm_prepare(AHandle)) < 0) {
      fprintf(stderr, "xrun: prepare error: %s", snd_strerror(res));
      exit(EXIT_FAILURE);
    }
    return;                     // ok, data should be accepted
    // again
  }

  fprintf(stderr, "read/write error, state = %s",
          snd_pcm_state_name(snd_pcm_status_get_state(status)));
  exit(EXIT_FAILURE);
}
开发者ID:FredSanders，项目名称:emacs.d，代码行数:32，代码来源:atcleci.cpp

示例10: snd_pcm_status_alloca

qint64 QAudioOutputPrivate::elapsedUSecs() const
{
    if(!handle)
        return 0;

    if (deviceState == QAudio::StoppedState)
        return 0;

#if(SND_LIB_MAJOR == 1 && SND_LIB_MINOR == 0 && SND_LIB_SUBMINOR >= 14)
    snd_pcm_status_t* status;
    snd_pcm_status_alloca(&status);

    snd_timestamp_t t1,t2;
    if( snd_pcm_status(handle, status) >= 0) {
        snd_pcm_status_get_tstamp(status,&t1);
        snd_pcm_status_get_trigger_tstamp(status,&t2);
        t1.tv_sec-=t2.tv_sec;

        signed long l = (signed long)t1.tv_usec - (signed long)t2.tv_usec;
        if(l < 0) {
            t1.tv_sec--;
            l = -l;
            l %= 1000000;
        }
        return ((t1.tv_sec * 1000000)+l);
    } else
        return 0;
#else
    return clockStamp.elapsed()*1000;
#endif
    return 0;
}
开发者ID:Nacto1，项目名称:qt-everywhere-opensource-src-4.6.2，代码行数:32，代码来源:qaudiooutput_alsa_p.cpp

示例11: log_state

static int log_state(ALSA_CARD *card) {
	// log card state
	snd_pcm_status_t *status;
	snd_pcm_state_t state;
	const char *state_str;
	snd_pcm_status_alloca(&status);
	snd_pcm_status(card->handle, status);
	state = snd_pcm_status_get_state(status);
	switch (state) {
		case SND_PCM_STATE_RUNNING:
			state_str = "running";
			break;
		case SND_PCM_STATE_XRUN:
			state_str = "overrun";
			break;
		case SND_PCM_STATE_DRAINING:
			state_str = "draining";
			break;
		case SND_PCM_STATE_PAUSED:
			state_str = "paused";
			break;
		case SND_PCM_STATE_SUSPENDED:
			state_str = "suspended";
			break;
		case SND_PCM_STATE_DISCONNECTED:
			state_str = "disconnected";
			break;
		default:
			state_str = "other";
		}
	log_msg("ALSA: state: %s [%d]\n", state_str, (int)state);
	return state;
	}
开发者ID:pmyadlowsky，项目名称:qmx，代码行数:33，代码来源:alsa.c

示例12: DumpDeviceStatus

static void DumpDeviceStatus (vlc_object_t *obj, snd_pcm_t *pcm)
{
    snd_pcm_status_t *status;

    snd_pcm_status_alloca (&status);
    snd_pcm_status (pcm, status);
    Dump (obj, "current status:\n", snd_pcm_status_dump, status);
}
开发者ID:sailfish009，项目名称:vlc，代码行数:8，代码来源:alsa.c

示例13: gettimer

/* stolen from devposs */
static uint32_t gettimer(void)
{
	long tmp=playpos;
	int odelay;

	if (busy++)
	{
		odelay=kernlen;
	} else {
		int err;
#ifdef ALSA_DEBUG
		fprintf(stderr, "ALSA snd_pcm_status(alsa_pcm, alsa_pcm_status) = ");
#endif
		if ((err=snd_pcm_status(alsa_pcm, alsa_pcm_status))<0)
		{
#ifdef ALSA_DEBUG
			fprintf(stderr, "failed: %s\n", snd_strerror(-err));
#endif
			fprintf(stderr, "ALSA: snd_pcm_status() failed: %s\n", snd_strerror(-err));
			odelay=kernlen;
		} else {
#ifdef ALSA_DEBUG
			fprintf(stderr, "ok\n");
			fprintf(stderr, "snd_pcm_status_get_delay(alsa_pcm_status) = ");
#endif

			odelay=snd_pcm_status_get_delay(alsa_pcm_status);
#ifdef ALSA_DEBUG
			fprintf(stderr, "%i\n", odelay);
#endif
			if (odelay<0) /* we ignore buffer-underruns */
				odelay=0;
			else if (odelay==0)
			{
			/* ALSA sometimes (atlast on Stians Ubuntu laptop) gives odelay==0 always */
				odelay = snd_pcm_status_get_avail_max(alsa_pcm_status) - snd_pcm_status_get_avail(alsa_pcm_status);
				if (odelay<0)
					odelay=0;
			}

			odelay<<=(bit16+stereo);
			if (odelay>kernlen)
			{
				odelay=kernlen;
			} else if ((odelay<kernlen))
			{
				kernlen=odelay;
				kernpos=(cachepos-kernlen+buflen)%buflen;
			}
		}
	}
	
	tmp-=odelay;
	busy--;
	return imuldiv(tmp, 65536>>(stereo+bit16), plrRate);
}
开发者ID:cynthia，项目名称:ocp-osx，代码行数:57，代码来源:devpalsa.c

示例14: gettimestamp

void gettimestamp(snd_pcm_t *handle, snd_timestamp_t *timestamp)
{
        int err;
        snd_pcm_status_t *status;
        snd_pcm_status_alloca(&status);
        if ((err = snd_pcm_status(handle, status)) < 0) {
                printf("Stream status error: %s\n", snd_strerror(err));
                exit(0);
        }
        snd_pcm_status_get_trigger_tstamp(status, timestamp);
}
开发者ID:gforth，项目名称:AlsaRecorder，代码行数:11，代码来源:latency.c

示例15: alsa_audio_deliver

static int
alsa_audio_deliver(audio_decoder_t *ad, int samples, int64_t pts, int epoch)
{
  decoder_t *d = (decoder_t *)ad;
  media_pipe_t *mp = ad->ad_mp;
  int c;

 retry:
  c = snd_pcm_wait(d->h, 100);
  if(c >= 0) {
    c = snd_pcm_avail_update(d->h);
  }
  if(c == -EPIPE) {
    snd_pcm_prepare(d->h);
    usleep(100000);
    TRACE(TRACE_DEBUG, "ALSA", "Audio underrun");
    d->samples = 0;
    goto retry;
  }

  c = MIN(d->max_frames_per_write, c);

  uint8_t *planes[8] = {0};
  planes[0] = d->tmp;
  c = avresample_read(ad->ad_avr, planes, c);
  
  snd_pcm_status_t *status;
  int err;
  snd_pcm_status_alloca(&status);
  if ((err = snd_pcm_status(d->h, status)) >= 0) {

    if(pts != AV_NOPTS_VALUE) {
      snd_htimestamp_t hts;
      snd_pcm_status_get_trigger_htstamp(status, &hts);
      int64_t ts = hts.tv_sec * 1000000LL + hts.tv_nsec / 1000;
      ts += d->samples * 1000000LL / ad->ad_out_sample_rate;

      hts_mutex_lock(&mp->mp_clock_mutex);
      mp->mp_audio_clock_avtime = ts;
      mp->mp_audio_clock = pts;
      mp->mp_audio_clock_epoch = epoch;
      hts_mutex_unlock(&mp->mp_clock_mutex);
    }
  }

  snd_pcm_sframes_t fr;
  if(!snd_pcm_delay(d->h, &fr))
    ad->ad_delay = 1000000L * fr / ad->ad_out_sample_rate;

  c = snd_pcm_writei(d->h, d->tmp, c);
  d->samples += c;
  return 0;
}
开发者ID:copernic-us，项目名称:showtime-1，代码行数:53，代码来源:alsa.c


注：本文中的snd_pcm_status函数示例由纯净天空整理自Github/MSDocs等开源代码及文档管理平台，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。