C++ GST_CLOCK_TIME_IS_VALID函数代码示例

static gboolean
_set_duration (GESTimelineElement * element, GstClockTime duration)
{
  GESTrackElement *object = GES_TRACK_ELEMENT (element);
  GESTrackElementPrivate *priv = object->priv;

  if (GST_CLOCK_TIME_IS_VALID (_MAXDURATION (element)) &&
      duration > _INPOINT (object) + _MAXDURATION (element))
    duration = _MAXDURATION (element) - _INPOINT (object);

  if (priv->gnlobject != NULL) {
    if (G_UNLIKELY (duration == _DURATION (object)))
      return FALSE;

    g_object_set (priv->gnlobject, "duration", duration, NULL);
  } else
    priv->pending_duration = duration;

  _update_control_bindings (element, ges_timeline_element_get_inpoint (element),
      duration);

  return TRUE;
}

void AudioTestSource_i::_new_gst_buffer(GstElement *sink, AudioTestSource_i* comp) {
	static GstBuffer *buffer;
	static std::vector<short> packet;

    /* Retrieve the buffer */
    g_signal_emit_by_name (sink, "pull-buffer", &buffer);
    if (buffer) {
    	BULKIO::PrecisionUTCTime T;

	    /* The only thing we do in this example is print a * to indicate a received buffer */
    	if (GST_CLOCK_TIME_IS_VALID(buffer->timestamp)) {
    		T = _from_gst_timestamp(buffer->timestamp);
    	} else {
    		T = _now();
    	}

    	packet.resize(buffer->size / 2); // TODO the division should come from reading buffer->caps
    	memcpy(&packet[0], buffer->data, buffer->size);

    	comp->audio_out->pushPacket(packet, T, false, comp->stream_id);
	    gst_buffer_unref (buffer);
    }
}

/* this function does the actual processing
 */
static GstFlowReturn
gst_audio_panorama_transform (GstBaseTransform * base, GstBuffer * inbuf,
    GstBuffer * outbuf)
{
  GstAudioPanorama *filter = GST_AUDIO_PANORAMA (base);
  GstClockTime timestamp, stream_time;
  GstMapInfo inmap, outmap;

  timestamp = GST_BUFFER_TIMESTAMP (inbuf);
  stream_time =
      gst_segment_to_stream_time (&base->segment, GST_FORMAT_TIME, timestamp);

  GST_DEBUG_OBJECT (filter, "sync to %" GST_TIME_FORMAT,
      GST_TIME_ARGS (timestamp));

  if (GST_CLOCK_TIME_IS_VALID (stream_time))
    gst_object_sync_values (GST_OBJECT (filter), stream_time);

  gst_buffer_map (inbuf, &inmap, GST_MAP_READ);
  gst_buffer_map (outbuf, &outmap, GST_MAP_WRITE);

  if (G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (inbuf, GST_BUFFER_FLAG_GAP))) {
    GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_GAP);
    memset (outmap.data, 0, outmap.size);
  } else {
    /* output always stereo, input mono or stereo,
     * and info describes input format */
    guint num_samples = outmap.size / (2 * GST_AUDIO_INFO_BPS (&filter->info));

    filter->process (filter, inmap.data, outmap.data, num_samples);
  }

  gst_buffer_unmap (inbuf, &inmap);
  gst_buffer_unmap (outbuf, &outmap);

  return GST_FLOW_OK;
}

static GstFlowReturn
gst_mpegv_parse_parse_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
{
  GstMpegvParse *mpvparse = GST_MPEGVIDEO_PARSE (parse);
  GstBuffer *buffer = frame->buffer;

  if (G_UNLIKELY (mpvparse->pichdr.pic_type == GST_MPEG_VIDEO_PICTURE_TYPE_I))
    GST_BUFFER_FLAG_UNSET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
  else
    GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);

  /* maybe only sequence in this buffer, though not recommended,
   * so mark it as such and force 0 duration */
  if (G_UNLIKELY (mpvparse->pic_offset < 0)) {
    GST_DEBUG_OBJECT (mpvparse, "frame holds no picture data");
    frame->flags |= GST_BASE_PARSE_FRAME_FLAG_NO_FRAME;
    GST_BUFFER_DURATION (buffer) = 0;
  }

  if (mpvparse->pic_offset > 4) {
    gst_base_parse_set_ts_at_offset (parse, mpvparse->pic_offset - 4);
  }

  if (mpvparse->frame_repeat_count
      && GST_CLOCK_TIME_IS_VALID (GST_BUFFER_DURATION (buffer))) {
    GST_BUFFER_DURATION (buffer) =
        (1 + mpvparse->frame_repeat_count) * GST_BUFFER_DURATION (buffer) / 2;
  }

  if (G_UNLIKELY (mpvparse->drop && !mpvparse->config)) {
    GST_DEBUG_OBJECT (mpvparse, "dropping frame as no config yet");
    return GST_BASE_PARSE_FLOW_DROPPED;
  }

  gst_mpegv_parse_update_src_caps (mpvparse);
  return GST_FLOW_OK;
}

/* Actual processing. */
static GstFlowReturn
gst_burn_transform_frame (GstVideoFilter * vfilter,
    GstVideoFrame * in_frame, GstVideoFrame * out_frame)
{
  GstBurn *filter = GST_BURN (vfilter);
  gint video_size, adjustment;
  guint32 *src, *dest;
  GstClockTime timestamp;
  gint64 stream_time;

  src = GST_VIDEO_FRAME_PLANE_DATA (in_frame, 0);
  dest = GST_VIDEO_FRAME_PLANE_DATA (out_frame, 0);

  video_size = GST_VIDEO_FRAME_WIDTH (in_frame) *
      GST_VIDEO_FRAME_HEIGHT (in_frame);

  /* GstController: update the properties */
  timestamp = GST_BUFFER_TIMESTAMP (in_frame->buffer);
  stream_time =
      gst_segment_to_stream_time (&GST_BASE_TRANSFORM (filter)->segment,
      GST_FORMAT_TIME, timestamp);

  GST_DEBUG_OBJECT (filter, "sync to %" GST_TIME_FORMAT,
      GST_TIME_ARGS (timestamp));

  if (GST_CLOCK_TIME_IS_VALID (stream_time))
    gst_object_sync_values (GST_OBJECT (filter), stream_time);

  GST_OBJECT_LOCK (filter);
  adjustment = filter->adjustment;
  GST_OBJECT_UNLOCK (filter);

  /*** Now the image processing work.... ***/
  gaudi_orc_burn (dest, src, adjustment, video_size);

  return GST_FLOW_OK;
}

static GstFlowReturn
gst_rtp_mpv_pay_handle_buffer (GstBaseRTPPayload * basepayload,
    GstBuffer * buffer)
{
  GstRTPMPVPay *rtpmpvpay;
  guint avail, packet_len;
  GstClockTime timestamp, duration;
  GstFlowReturn ret;

  rtpmpvpay = GST_RTP_MPV_PAY (basepayload);

  timestamp = GST_BUFFER_TIMESTAMP (buffer);
  duration = GST_BUFFER_DURATION (buffer);

  gst_adapter_push (rtpmpvpay->adapter, buffer);
  avail = gst_adapter_available (rtpmpvpay->adapter);

  /* Initialize new RTP payload */
  if (avail == 0) {
    rtpmpvpay->first_ts = timestamp;
    rtpmpvpay->duration = duration;
  }

  /* get packet length of previous data and this new data,
   * payload length includes a 4 byte MPEG video-specific header */
  packet_len = gst_rtp_buffer_calc_packet_len (4 + avail, 0, 0);

  if (gst_basertppayload_is_filled (basepayload,
          packet_len, rtpmpvpay->duration + duration)) {
    ret = gst_rtp_mpv_pay_flush (rtpmpvpay, timestamp, duration);
  } else {
    if (GST_CLOCK_TIME_IS_VALID (duration))
      rtpmpvpay->duration += duration;
    ret = GST_FLOW_OK;
  }
  return ret;
}

/**
 * Utility function to handle transferring Gstreamer timestamp to OMX
 * timestamp.  This function handles discontinuities and timestamp
 * renormalization.
 *
 * @omx_buffer the destination OMX buffer for the timestamp
 * @buffer     the source Gstreamer buffer for the timestamp
 * @normalize  should this buffer be the one that we renormalize on
 *   (iff normalization is required)?  (ie. with TI OMX, you should
 *   only re-normalize on a video buffer)
 */
gboolean
gst_goo_timestamp_gst2omx (
		OMX_BUFFERHEADERTYPE* omx_buffer,
		GstBuffer* buffer,
		gboolean normalize)
{
	GstClockTime timestamp = GST_BUFFER_TIMESTAMP (buffer);

	if (GST_GOO_UTIL_IS_DISCONT (buffer))
	{
		needs_normalization = TRUE;
		GST_DEBUG ("needs_normalization");
	}

	if (needs_normalization && normalize)
	{
		GST_INFO ("Setting OMX_BUFFER_STARTTIME..");
		omx_buffer->nFlags |= OMX_BUFFERFLAG_STARTTIME;
		omx_normalize_timestamp = GST2OMX_TIMESTAMP ((gint64)timestamp);
		needs_normalization = FALSE;
		GST_DEBUG ("omx_normalize_timestamp=%lld", omx_normalize_timestamp);
	}

	/* transfer timestamp to openmax */
	if (GST_CLOCK_TIME_IS_VALID (timestamp))
	{
		omx_buffer->nTimeStamp = GST2OMX_TIMESTAMP ((gint64)timestamp) - omx_normalize_timestamp;
		GST_INFO ("OMX timestamp = %lld (%lld - %lld)", omx_buffer->nTimeStamp, GST2OMX_TIMESTAMP ((gint64)timestamp), omx_normalize_timestamp);
		return TRUE;
	}
	else
	{
		GST_WARNING ("Invalid timestamp!");
		return FALSE;
	}
}

/**
 * gst_timed_value_control_source_unset:
 * @self: the #GstTimedValueControlSource object
 * @timestamp: the time the control-change should be removed from
 *
 * Used to remove the value of given controller-handled property at a certain
 * time.
 *
 * Returns: FALSE if the value couldn't be unset (i.e. not found, TRUE otherwise.
 */
gboolean
gst_timed_value_control_source_unset (GstTimedValueControlSource * self,
    GstClockTime timestamp)
{
  GSequenceIter *iter;
  gboolean res = FALSE;
  GstControlPoint *cp = NULL;

  g_return_val_if_fail (GST_IS_TIMED_VALUE_CONTROL_SOURCE (self), FALSE);
  g_return_val_if_fail (GST_CLOCK_TIME_IS_VALID (timestamp), FALSE);

  g_mutex_lock (&self->lock);
  /* check if a control point for the timestamp exists */
  if (G_LIKELY (self->values) && (iter =
          g_sequence_lookup (self->values, &timestamp,
              (GCompareDataFunc) gst_control_point_find, NULL))) {

    /* Iter contains the iter right after timestamp, i.e.
     * we need to get the previous one and check the timestamp
     */
    cp = g_slice_dup (GstControlPoint, g_sequence_get (iter));
    g_sequence_remove (iter);
    self->nvalues--;
    self->valid_cache = FALSE;
    res = TRUE;
  }
  g_mutex_unlock (&self->lock);

  if (cp) {
    g_signal_emit (self,
        gst_timed_value_control_source_signals[VALUE_REMOVED_SIGNAL], 0, cp);
    g_slice_free (GstControlPoint, cp);
  }

  return res;
}

static GValue *
gst_direct_control_binding_get_value (GstControlBinding * _self,
    GstClockTime timestamp)
{
  GstDirectControlBinding *self = GST_DIRECT_CONTROL_BINDING (_self);
  GValue *dst_val = NULL;
  gdouble src_val;

  g_return_val_if_fail (GST_IS_DIRECT_CONTROL_BINDING (self), NULL);
  g_return_val_if_fail (GST_CLOCK_TIME_IS_VALID (timestamp), NULL);
  g_return_val_if_fail (GST_CONTROL_BINDING_PSPEC (self), FALSE);

  /* get current value via control source */
  if (gst_control_source_get_value (self->cs, timestamp, &src_val)) {
    dst_val = g_new0 (GValue, 1);
    g_value_init (dst_val, G_PARAM_SPEC_VALUE_TYPE (_self->pspec));
    self->convert_g_value (self, src_val, dst_val);
  } else {
    GST_LOG ("no control value for property %s at ts %" GST_TIME_FORMAT,
        _self->name, GST_TIME_ARGS (timestamp));
  }

  return dst_val;
}

static GstFlowReturn
gst_frame_positionner_transform_ip (GstBaseTransform * trans, GstBuffer * buf)
{
  GstFramePositionnerMeta *meta;
  GstFramePositionner *framepositionner = GST_FRAME_POSITIONNER (trans);
  GstClockTime timestamp = GST_BUFFER_TIMESTAMP (buf);

  if (GST_CLOCK_TIME_IS_VALID (timestamp)) {
    gst_object_sync_values (GST_OBJECT (trans), timestamp);
  }

  meta =
      (GstFramePositionnerMeta *) gst_buffer_add_meta (buf,
      gst_frame_positionner_get_info (), NULL);

  GST_OBJECT_LOCK (framepositionner);
  meta->alpha = framepositionner->alpha;
  meta->posx = framepositionner->posx;
  meta->posy = framepositionner->posy;
  meta->zorder = framepositionner->zorder;
  GST_OBJECT_UNLOCK (framepositionner);

  return GST_FLOW_OK;
}

/**
 * ges_layer_add_asset:
 * @layer: a #GESLayer
 * @asset: The asset to add to
 * @start: The start value to set on the new #GESClip
 * @inpoint: The inpoint value to set on the new #GESClip
 * @duration: The duration value to set on the new #GESClip
 * @track_types: The #GESTrackType to set on the the new #GESClip
 *
 * Creates Clip from asset, adds it to layer and
 * returns a reference to it.
 *
 * Returns: (transfer none): Created #GESClip
 */
GESClip *
ges_layer_add_asset (GESLayer * layer,
    GESAsset * asset, GstClockTime start, GstClockTime inpoint,
    GstClockTime duration, GESTrackType track_types)
{
  GESClip *clip;

  g_return_val_if_fail (GES_IS_LAYER (layer), NULL);
  g_return_val_if_fail (GES_IS_ASSET (asset), NULL);
  g_return_val_if_fail (g_type_is_a (ges_asset_get_extractable_type
          (asset), GES_TYPE_CLIP), NULL);

  GST_DEBUG_OBJECT (layer, "Adding asset %s with: start: %" GST_TIME_FORMAT
      " inpoint: %" GST_TIME_FORMAT " duration: %" GST_TIME_FORMAT
      " track types: %d (%s)", ges_asset_get_id (asset), GST_TIME_ARGS (start),
      GST_TIME_ARGS (inpoint), GST_TIME_ARGS (duration), track_types,
      ges_track_type_name (track_types));

  clip = GES_CLIP (ges_asset_extract (asset, NULL));
  _set_start0 (GES_TIMELINE_ELEMENT (clip), start);
  _set_inpoint0 (GES_TIMELINE_ELEMENT (clip), inpoint);
  if (track_types != GES_TRACK_TYPE_UNKNOWN)
    ges_clip_set_supported_formats (clip, track_types);

  if (GST_CLOCK_TIME_IS_VALID (duration)) {
    _set_duration0 (GES_TIMELINE_ELEMENT (clip), duration);
  }

  if (!ges_layer_add_clip (layer, clip)) {
    gst_object_unref (clip);

    return NULL;
  }

  return clip;
}

/* GstBaseTransform vmethod implementations */
static GstFlowReturn
gst_audio_fx_base_iir_filter_transform_ip (GstBaseTransform * base,
    GstBuffer * buf)
{
  GstAudioFXBaseIIRFilter *filter = GST_AUDIO_FX_BASE_IIR_FILTER (base);
  guint num_samples;
  GstClockTime timestamp, stream_time;
  GstMapInfo map;

  timestamp = GST_BUFFER_TIMESTAMP (buf);
  stream_time =
      gst_segment_to_stream_time (&base->segment, GST_FORMAT_TIME, timestamp);

  GST_DEBUG_OBJECT (filter, "sync to %" GST_TIME_FORMAT,
      GST_TIME_ARGS (timestamp));

  if (GST_CLOCK_TIME_IS_VALID (stream_time))
    gst_object_sync_values (GST_OBJECT (filter), stream_time);

  gst_buffer_map (buf, &map, GST_MAP_READWRITE);
  num_samples = map.size / GST_AUDIO_FILTER_BPS (filter);

  g_mutex_lock (&filter->lock);
  if (filter->a == NULL || filter->b == NULL) {
    g_warn_if_fail (filter->a != NULL && filter->b != NULL);
    gst_buffer_unmap (buf, &map);
    g_mutex_unlock (&filter->lock);
    return GST_FLOW_ERROR;
  }
  filter->process (filter, map.data, num_samples);
  g_mutex_unlock (&filter->lock);

  gst_buffer_unmap (buf, &map);

  return GST_FLOW_OK;
}

static gboolean
gst_v4l2_video_dec_decide_allocation (GstVideoDecoder * decoder,
    GstQuery * query)
{
  GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
  GstClockTime latency;
  gboolean ret = FALSE;

  if (gst_v4l2_object_decide_allocation (self->v4l2capture, query))
    ret = GST_VIDEO_DECODER_CLASS (parent_class)->decide_allocation (decoder,
        query);

  if (GST_CLOCK_TIME_IS_VALID (self->v4l2capture->duration)) {
    latency = self->v4l2capture->min_buffers * self->v4l2capture->duration;
    GST_DEBUG_OBJECT (self, "Setting latency: %" GST_TIME_FORMAT " (%"
        G_GUINT32_FORMAT " * %" G_GUINT64_FORMAT, GST_TIME_ARGS (latency),
        self->v4l2capture->min_buffers, self->v4l2capture->duration);
    gst_video_decoder_set_latency (decoder, latency, latency);
  } else {
    GST_WARNING_OBJECT (self, "Duration invalid, not setting latency");
  }

  return ret;
}

static inline gboolean
ges_track_object_set_duration_internal (GESTrackObject * object,
    guint64 duration)
{
  GESTrackObjectPrivate *priv = object->priv;

  GST_DEBUG ("object:%p, duration:%" GST_TIME_FORMAT,
      object, GST_TIME_ARGS (duration));

  if (GST_CLOCK_TIME_IS_VALID (priv->maxduration) &&
      duration > object->inpoint + priv->maxduration)
    duration = priv->maxduration - object->inpoint;

  if (priv->gnlobject != NULL) {
    if (G_UNLIKELY (duration == object->duration))
      return FALSE;

    g_object_set (priv->gnlobject, "duration", duration,
        "media-duration", duration, NULL);
  } else
    priv->pending_duration = duration;

  return TRUE;
}

//.........这里部分代码省略.........
    if (gst_adapter_available (mimdec->adapter) < payload_size + 24)
      return GST_FLOW_OK;

    /* We have a whole packet and have read the header, lets flush it out */
    gst_adapter_flush (mimdec->adapter, 24);

    frame_body = gst_adapter_map (mimdec->adapter, payload_size);

    if (mimdec->buffer_size < 0) {
      /* Check if its a keyframe, otherwise skip it */
      if (GUINT32_FROM_LE (*((guint32 *) (frame_body + 12))) != 0) {
        gst_adapter_unmap (mimdec->adapter);
        gst_adapter_flush (mimdec->adapter, payload_size);
        return GST_FLOW_OK;
      }

      if (!mimic_decoder_init (mimdec->dec, frame_body)) {
        gst_adapter_unmap (mimdec->adapter);
        gst_adapter_flush (mimdec->adapter, payload_size);
        GST_ELEMENT_ERROR (mimdec, LIBRARY, INIT, (NULL),
            ("mimic_decoder_init error"));
        return GST_FLOW_ERROR;
      }

      if (!mimic_get_property (mimdec->dec, "buffer_size",
              &mimdec->buffer_size)) {
        gst_adapter_unmap (mimdec->adapter);
        gst_adapter_flush (mimdec->adapter, payload_size);
        GST_ELEMENT_ERROR (mimdec, LIBRARY, INIT, (NULL),
            ("mimic_get_property('buffer_size') error"));
        return GST_FLOW_ERROR;
      }

      mimic_get_property (mimdec->dec, "width", &width);
      mimic_get_property (mimdec->dec, "height", &height);
      GST_DEBUG_OBJECT (mimdec,
          "Initialised decoder with %d x %d payload size %d buffer_size %d",
          width, height, payload_size, mimdec->buffer_size);
      caps = gst_caps_new_simple ("video/x-raw",
          "format", G_TYPE_STRING, "RGB",
          "framerate", GST_TYPE_FRACTION, 0, 1,
          "width", G_TYPE_INT, width, "height", G_TYPE_INT, height, NULL);
      gst_pad_set_caps (mimdec->srcpad, caps);
      gst_caps_unref (caps);
    }


    if (mimdec->need_segment) {
      GstSegment segment;

      gst_segment_init (&segment, GST_FORMAT_TIME);

      if (GST_CLOCK_TIME_IS_VALID (in_time))
        segment.start = in_time;
      else
        segment.start = current_ts * GST_MSECOND;
      event = gst_event_new_segment (&segment);
    }
    mimdec->need_segment = FALSE;

    if (event)
      result = gst_pad_push_event (mimdec->srcpad, event);
    event = NULL;

    if (!result) {
      GST_WARNING_OBJECT (mimdec, "gst_pad_push_event failed");
      return GST_FLOW_ERROR;
    }


    out_buf = gst_buffer_new_allocate (NULL, mimdec->buffer_size, NULL);
    gst_buffer_map (out_buf, &map, GST_MAP_READWRITE);

    if (!mimic_decode_frame (mimdec->dec, frame_body, map.data)) {
      GST_WARNING_OBJECT (mimdec, "mimic_decode_frame error\n");

      gst_adapter_flush (mimdec->adapter, payload_size);

      gst_buffer_unmap (out_buf, &map);
      gst_buffer_unref (out_buf);
      GST_ELEMENT_ERROR (mimdec, STREAM, DECODE, (NULL),
          ("mimic_decode_frame error"));
      return GST_FLOW_ERROR;
    }
    gst_buffer_unmap (out_buf, &map);
    gst_adapter_flush (mimdec->adapter, payload_size);

    if (GST_CLOCK_TIME_IS_VALID (in_time))
      GST_BUFFER_TIMESTAMP (out_buf) = in_time;
    else
      GST_BUFFER_TIMESTAMP (out_buf) = current_ts * GST_MSECOND;

    res = gst_pad_push (mimdec->srcpad, out_buf);

    if (res != GST_FLOW_OK)
      break;
  }

  return res;
}