C++ GST_QUERY_TYPE函数代码示例

static gboolean
gst_cdxa_parse_src_query (GstPad * srcpad, GstQuery * query)
{
  GstCDXAParse *cdxa = GST_CDXA_PARSE (gst_pad_get_parent (srcpad));
  gboolean res = FALSE;

  GST_DEBUG_OBJECT (cdxa, "Handling %s query",
      gst_query_type_get_name (GST_QUERY_TYPE (query)));

  res = gst_pad_query_default (srcpad, query);

  if (res) {
    GstFormat format;
    gint64 val;

    switch (GST_QUERY_TYPE (query)) {
      case GST_QUERY_DURATION:
        gst_query_parse_duration (query, &format, &val);
        if (format == GST_FORMAT_BYTES) {
          val = gst_cdxa_parse_convert_sink_to_src_offset (cdxa, val);
          gst_query_set_duration (query, format, val);
        }
        break;
      case GST_QUERY_POSITION:
        gst_query_parse_position (query, &format, &val);
        if (format == GST_FORMAT_BYTES) {
          val = gst_cdxa_parse_convert_sink_to_src_offset (cdxa, val);
          gst_query_set_position (query, format, val);
        }
        break;
      default:
        break;
    }
  }

  gst_object_unref (cdxa);
  return res;
}

static gboolean
gst_interleave_src_query (GstPad * pad, GstQuery * query)
{
  GstInterleave *self = GST_INTERLEAVE (gst_pad_get_parent (pad));

  gboolean res = FALSE;

  switch (GST_QUERY_TYPE (query)) {
    case GST_QUERY_POSITION:
    {
      GstFormat format;

      gst_query_parse_position (query, &format, NULL);

      switch (format) {
        case GST_FORMAT_TIME:
          /* FIXME, bring to stream time, might be tricky */
          gst_query_set_position (query, format, self->timestamp);
          res = TRUE;
          break;
        case GST_FORMAT_BYTES:
          gst_query_set_position (query, format,
              self->offset * self->channels * self->width);
          res = TRUE;
          break;
        case GST_FORMAT_DEFAULT:
          gst_query_set_position (query, format, self->offset);
          res = TRUE;
          break;
        default:
          break;
      }
      break;
    }
    case GST_QUERY_DURATION:
      res = gst_interleave_src_query_duration (self, query);
      break;
    case GST_QUERY_LATENCY:
      res = gst_interleave_src_query_latency (self, query);
      break;
    default:
      /* FIXME, needs a custom query handler because we have multiple
       * sinkpads */
      res = gst_pad_query_default (pad, query);
      break;
  }

  gst_object_unref (self);
  return res;
}

static gboolean
gst_segment_clip_query (GstPad * pad, GstObject * parent, GstQuery * query)
{
  GstSegmentClip *self = GST_SEGMENT_CLIP (parent);
  gboolean ret;

  GST_LOG_OBJECT (pad, "Handling query of type '%s'",
      gst_query_type_get_name (GST_QUERY_TYPE (query)));

  if (GST_QUERY_TYPE (query) == GST_QUERY_CAPS) {
    GstCaps *caps;

    gst_query_parse_caps (query, &caps);
    caps = gst_segment_clip_getcaps (self, pad, caps);
    gst_query_set_caps_result (query, caps);
    gst_caps_unref (caps);
    ret = TRUE;
  } else {
    ret = gst_pad_query_default (pad, parent, query);
  }

  return ret;
}

static gboolean
gst_app_src_query (GstBaseSrc * src, GstQuery * query)
{
  GstAppSrc *appsrc = GST_APP_SRC_CAST (src);
  GstAppSrcPrivate *priv = appsrc->priv;
  gboolean res;

  switch (GST_QUERY_TYPE (query)) {
    case GST_QUERY_LATENCY:
    {
      GstClockTime min, max;
      gboolean live;

      /* Query the parent class for the defaults */
      res = gst_base_src_query_latency (src, &live, &min, &max);

      /* overwrite with our values when we need to */
      g_mutex_lock (&priv->mutex);
      if (priv->min_latency != -1)
        min = priv->min_latency;
      if (priv->max_latency != -1)
        max = priv->max_latency;
      g_mutex_unlock (&priv->mutex);

      gst_query_set_latency (query, live, min, max);
      break;
    }
    case GST_QUERY_SCHEDULING:
    {
      gst_query_set_scheduling (query, GST_SCHEDULING_FLAG_SEEKABLE, 1, -1, 0);
      gst_query_add_scheduling_mode (query, GST_PAD_MODE_PUSH);

      switch (priv->stream_type) {
        case GST_APP_STREAM_TYPE_STREAM:
        case GST_APP_STREAM_TYPE_SEEKABLE:
          break;
        case GST_APP_STREAM_TYPE_RANDOM_ACCESS:
          gst_query_add_scheduling_mode (query, GST_PAD_MODE_PULL);
          break;
      }
      res = TRUE;
      break;
    }
    default:
      res = GST_BASE_SRC_CLASS (parent_class)->query (src, query);
      break;
  }

  return res;
}

static gboolean
tee_query_function (GstPad * pad, GstObject * parent, GstQuery * query)
{
  if (GST_QUERY_TYPE (query) == GST_QUERY_ACCEPT_CAPS) {
    GstCaps *caps;
    KmsTreeBin *self = KMS_TREE_BIN (GST_OBJECT_PARENT (parent));

    gst_query_parse_accept_caps (query, &caps);

    kms_tree_bin_set_input_caps (self, caps);
  }

  return gst_pad_query_default (pad, parent, query);
}

static gboolean
gst_tta_parse_query (GstPad * pad, GstQuery * query)
{
  GstTtaParse *ttaparse = GST_TTA_PARSE (gst_pad_get_parent (pad));

  switch (GST_QUERY_TYPE (query)) {
    case GST_QUERY_POSITION:
    {
      GstFormat format;
      gint64 cur;

      gst_query_parse_position (query, &format, NULL);
      switch (format) {
        case GST_FORMAT_TIME:
          cur = ttaparse->index[ttaparse->current_frame].time;
          break;
        default:
          format = GST_FORMAT_BYTES;
          cur = ttaparse->index[ttaparse->current_frame].pos;
          break;
      }
      gst_query_set_position (query, format, cur);
      break;
    }
    case GST_QUERY_DURATION:
    {
      GstFormat format;
      gint64 end;

      gst_query_parse_duration (query, &format, NULL);
      switch (format) {
        case GST_FORMAT_TIME:
          end = ((gdouble) ttaparse->data_length /
              (gdouble) ttaparse->samplerate) * GST_SECOND;
          break;
        default:
          format = GST_FORMAT_BYTES;
          end = ttaparse->index[ttaparse->num_frames].pos +
              ttaparse->index[ttaparse->num_frames].size;
          break;
      }
      gst_query_set_duration (query, format, end);
      break;
    }
    default:
      return FALSE;
      break;
  }
  return TRUE;
}

static gboolean
gst_gtk_gl_sink_query (GstBaseSink * bsink, GstQuery * query)
{
    GstGtkGLSink *gtk_sink = GST_GTK_GL_SINK (bsink);
    gboolean res = FALSE;

    switch (GST_QUERY_TYPE (query)) {
    case GST_QUERY_CONTEXT:
    {
        const gchar *context_type;
        GstContext *context, *old_context;

        res = gst_gl_handle_context_query ((GstElement *) gtk_sink, query,
                                           &gtk_sink->display, &gtk_sink->gtk_context);

        if (gtk_sink->display)
            gst_gl_display_filter_gl_api (gtk_sink->display, GST_GL_API_OPENGL3);

        gst_query_parse_context_type (query, &context_type);

        if (g_strcmp0 (context_type, "gst.gl.local_context") == 0) {
            GstStructure *s;

            gst_query_parse_context (query, &old_context);

            if (old_context)
                context = gst_context_copy (old_context);
            else
                context = gst_context_new ("gst.gl.local_context", FALSE);

            s = gst_context_writable_structure (context);
            gst_structure_set (s, "context", GST_GL_TYPE_CONTEXT, gtk_sink->context,
                               NULL);
            gst_query_set_context (query, context);
            gst_context_unref (context);

            res = gtk_sink->context != NULL;
        }
        GST_LOG_OBJECT (gtk_sink, "context query of type %s %i", context_type,
                        res);
        break;
    }
    default:
        res = GST_BASE_SINK_CLASS (parent_class)->query (bsink, query);
        break;
    }

    return res;
}

/**
 * @brief This function handles sink pad query.
 */
static gboolean
gst_tensor_aggregator_sink_query (GstPad * pad, GstObject * parent,
    GstQuery * query)
{
  GstTensorAggregator *self;

  self = GST_TENSOR_AGGREGATOR (parent);

  GST_DEBUG_OBJECT (self, "Received %s query: %" GST_PTR_FORMAT,
      GST_QUERY_TYPE_NAME (query), query);

  switch (GST_QUERY_TYPE (query)) {
    case GST_QUERY_CAPS:
    {
      GstCaps *caps;
      GstCaps *filter;

      gst_query_parse_caps (query, &filter);
      caps = gst_tensor_aggregator_query_caps (self, pad, filter);

      gst_query_set_caps_result (query, caps);
      gst_caps_unref (caps);
      return TRUE;
    }
    case GST_QUERY_ACCEPT_CAPS:
    {
      GstCaps *caps;
      GstCaps *template_caps;
      gboolean res = FALSE;

      gst_query_parse_accept_caps (query, &caps);
      silent_debug_caps (caps, "accept-caps");

      if (gst_caps_is_fixed (caps)) {
        template_caps = gst_pad_get_pad_template_caps (pad);

        res = gst_caps_can_intersect (template_caps, caps);
        gst_caps_unref (template_caps);
      }

      gst_query_set_accept_caps_result (query, res);
      return TRUE;
    }
    default:
      break;
  }

  return gst_pad_query_default (pad, parent, query);
}

static gboolean
gst_base_audio_src_query (GstBaseSrc * bsrc, GstQuery * query)
{
  GstBaseAudioSrc *src = GST_BASE_AUDIO_SRC (bsrc);
  gboolean res = FALSE;

  switch (GST_QUERY_TYPE (query)) {
    case GST_QUERY_LATENCY:
    {
      GstClockTime min_latency, max_latency;
      GstRingBufferSpec *spec;

      GST_OBJECT_LOCK (src);
      if (G_UNLIKELY (src->ringbuffer == NULL
              || src->ringbuffer->spec.rate == 0)) {
        GST_OBJECT_UNLOCK (src);
        goto done;
      }

      spec = &src->ringbuffer->spec;

      /* we have at least 1 segment of latency */
      min_latency =
          gst_util_uint64_scale_int (spec->segsize, GST_SECOND,
          spec->rate * spec->bytes_per_sample);
      /* we cannot delay more than the buffersize else we lose data */
      max_latency =
          gst_util_uint64_scale_int (spec->segtotal * spec->segsize, GST_SECOND,
          spec->rate * spec->bytes_per_sample);
      GST_OBJECT_UNLOCK (src);

      GST_DEBUG_OBJECT (src,
          "report latency min %" GST_TIME_FORMAT " max %" GST_TIME_FORMAT,
          GST_TIME_ARGS (min_latency), GST_TIME_ARGS (max_latency));

      /* we are always live, the min latency is 1 segment and the max latency is
       * the complete buffer of segments. */
      gst_query_set_latency (query, TRUE, min_latency, max_latency);

      res = TRUE;
      break;
    }
    default:
      res = GST_BASE_SRC_CLASS (parent_class)->query (bsrc, query);
      break;
  }
done:
  return res;
}

static gboolean
gst_gio_src_query (GstBaseSrc * base_src, GstQuery * query)
{
  gboolean res;
  GstGioSrc *src = GST_GIO_SRC (base_src);

  switch (GST_QUERY_TYPE (query)) {
    case GST_QUERY_SCHEDULING:
    {
      gchar *scheme;
      GstSchedulingFlags flags;

      flags = 0;
      if (src->file == NULL)
        goto forward_parent;

      scheme = g_file_get_uri_scheme (src->file);
      if (scheme == NULL)
        goto forward_parent;

      if (strcmp (scheme, "file") == 0) {
        GST_LOG_OBJECT (src, "local URI, assuming random access is possible");
        flags |= GST_SCHEDULING_FLAG_SEEKABLE;
      } else if (strcmp (scheme, "http") == 0 || strcmp (scheme, "https") == 0) {
        GST_LOG_OBJECT (src, "blacklisted protocol '%s', "
            "no random access possible", scheme);
      } else {
        GST_LOG_OBJECT (src, "unhandled protocol '%s', asking parent", scheme);
        goto forward_parent;
      }
      g_free (scheme);

      gst_query_set_scheduling (query, flags, 1, -1, 0);
      gst_query_add_scheduling_mode (query, GST_PAD_MODE_PUSH);
      if (flags & GST_SCHEDULING_FLAG_SEEKABLE)
        gst_query_add_scheduling_mode (query, GST_PAD_MODE_PULL);

      res = TRUE;
      break;
    }
    default:
    forward_parent:
      res = GST_CALL_PARENT_WITH_DEFAULT (GST_BASE_SRC_CLASS,
          query, (base_src, query), FALSE);
      break;
  }

  return res;
}

static gboolean
gst_inter_sub_src_query (GstBaseSrc * src, GstQuery * query)
{
  GstInterSubSrc *intersubsrc = GST_INTER_SUB_SRC (src);
  gboolean ret;

  GST_DEBUG_OBJECT (intersubsrc, "query");

  switch (GST_QUERY_TYPE (query)) {
    default:
      ret = GST_BASE_SRC_CLASS (parent_class)->query (src, query);
  }

  return ret;
}

static GstPadProbeReturn
cb_latency (GstPad * pad, GstPadProbeInfo * info, gpointer data)
{
  if (GST_QUERY_TYPE (GST_PAD_PROBE_INFO_QUERY (info)) != GST_QUERY_LATENCY) {
    return GST_PAD_PROBE_OK;
  }

  GST_LOG_OBJECT (pad, "Modifing latency query. New latency %" G_GUINT64_FORMAT,
      (guint64) (LATENCY * GST_MSECOND));

  gst_query_set_latency (GST_PAD_PROBE_INFO_QUERY (info),
      TRUE, 0, LATENCY * GST_MSECOND);

  return GST_PAD_PROBE_HANDLED;
}

static gboolean
gst_directsound_sink_query (GstBaseSink * sink, GstQuery * query)
{
  gboolean res = TRUE;

  switch (GST_QUERY_TYPE (query)) {
    case GST_QUERY_ACCEPT_CAPS:
      res = gst_directsound_sink_acceptcaps (sink, query);
      break;
    default:
      res = GST_BASE_SINK_CLASS (parent_class)->query (sink, query);
  }

  return res;
}

static gboolean
kms_agnostic_bin2_sink_query (GstPad * pad, GstObject * parent,
    GstQuery * query)
{
  gboolean ret;

  if (GST_QUERY_TYPE (query) == GST_QUERY_ACCEPT_CAPS) {
    gst_query_set_accept_caps_result (query, TRUE);
    return TRUE;
  }

  ret = gst_pad_query_default (pad, parent, query);

  if (ret && GST_QUERY_TYPE (query) == GST_QUERY_LATENCY) {
    GstClockTime min_latency;
    GstClockTime max_latency;

    gst_query_parse_latency (query, NULL, &min_latency, &max_latency);

    gst_query_set_latency (query, TRUE, min_latency, max_latency);
  }

  return ret;
}

static GstPadProbeReturn
query_cb (GstPad * pad, GstPadProbeInfo * info, gpointer user_data)
{
    APP_STATE_T *state = (APP_STATE_T *) user_data;
    GstQuery *query = GST_PAD_PROBE_INFO_QUERY (info);
    GstStructure *external_gl_context_desc = NULL;
    gchar *platform = NULL;
    gchar *gl_apis = NULL;

    switch (GST_QUERY_TYPE (query)) {
    case GST_QUERY_ALLOCATION:
    {
        platform = gst_gl_platform_to_string (GST_GL_PLATFORM_EGL);
        gl_apis = gst_gl_api_to_string (GST_GL_API_GLES2);

        external_gl_context_desc =
            gst_structure_new ("GstVideoGLTextureUploadMeta",
                               "gst.gl.context.handle", G_TYPE_POINTER, state->context,
                               "gst.gl.context.type", G_TYPE_STRING, platform,
                               "gst.gl.context.apis", G_TYPE_STRING, gl_apis, NULL);
        gst_query_add_allocation_meta (query,
                                       GST_VIDEO_GL_TEXTURE_UPLOAD_META_API_TYPE, external_gl_context_desc);
        gst_structure_free (external_gl_context_desc);

        g_free (gl_apis);
        g_free (platform);

        GST_DEBUG ("done alocation");
        return GST_PAD_PROBE_OK;
        break;
    }
    case GST_QUERY_CONTEXT:
    {
        return gst_gl_handle_context_query (state->pipeline, query,
                                            (GstGLDisplay **) & state->gst_display);
        break;
    }
    case GST_QUERY_DRAIN:
    {
        flush_internal (state);
        break;
    }
    default:
        break;
    }

    return GST_PAD_PROBE_OK;
}