C++ GST_QUARK函数代码示例

/**
 * gst_buffer_pool_config_add_option:
 * @config: a #GstBufferPool configuration
 * @option: an option to add
 *
 * Enabled the option in @config. This will instruct the @bufferpool to enable
 * the specified option on the buffers that it allocates.
 *
 * The supported options by @pool can be retrieved with gst_buffer_pool_get_options().
 */
void
gst_buffer_pool_config_add_option (GstStructure * config, const gchar * option)
{
  const GValue *value;
  GValue option_value = { 0, };
  guint i, len;

  g_return_if_fail (config != NULL);

  value = gst_structure_id_get_value (config, GST_QUARK (OPTIONS));
  if (value) {
    len = gst_value_array_get_size (value);
    for (i = 0; i < len; ++i) {
      const GValue *nth_val = gst_value_array_get_value (value, i);

      if (g_str_equal (option, g_value_get_string (nth_val)))
        return;
    }
  } else {
    GValue new_array_val = { 0, };

    g_value_init (&new_array_val, GST_TYPE_ARRAY);
    gst_structure_id_take_value (config, GST_QUARK (OPTIONS), &new_array_val);
    value = gst_structure_id_get_value (config, GST_QUARK (OPTIONS));
  }
  g_value_init (&option_value, G_TYPE_STRING);
  g_value_set_string (&option_value, option);
  gst_value_array_append_value ((GValue *) value, &option_value);
  g_value_unset (&option_value);
}

/**
 * gst_event_parse_step:
 * @event: The event to query
 * @format: (out) (allow-none): a pointer to store the format in
 * @amount: (out) (allow-none): a pointer to store the amount in
 * @rate: (out) (allow-none): a pointer to store the rate in
 * @flush: (out) (allow-none): a pointer to store the flush boolean in
 * @intermediate: (out) (allow-none): a pointer to store the intermediate
 *     boolean in
 *
 * Parse the step event.
 */
void
gst_event_parse_step (GstEvent * event, GstFormat * format, guint64 * amount,
    gdouble * rate, gboolean * flush, gboolean * intermediate)
{
  const GstStructure *structure;

  g_return_if_fail (GST_IS_EVENT (event));
  g_return_if_fail (GST_EVENT_TYPE (event) == GST_EVENT_STEP);

  structure = GST_EVENT_STRUCTURE (event);
  if (format)
    *format =
        (GstFormat) g_value_get_enum (gst_structure_id_get_value (structure,
            GST_QUARK (FORMAT)));
  if (amount)
    *amount = g_value_get_uint64 (gst_structure_id_get_value (structure,
            GST_QUARK (AMOUNT)));
  if (rate)
    *rate = g_value_get_double (gst_structure_id_get_value (structure,
            GST_QUARK (RATE)));
  if (flush)
    *flush = g_value_get_boolean (gst_structure_id_get_value (structure,
            GST_QUARK (FLUSH)));
  if (intermediate)
    *intermediate = g_value_get_boolean (gst_structure_id_get_value (structure,
            GST_QUARK (INTERMEDIATE)));
}

/**
 * gst_event_parse_buffer_size:
 * @event: The event to query
 * @format: (out): A pointer to store the format in
 * @minsize: (out): A pointer to store the minsize in
 * @maxsize: (out): A pointer to store the maxsize in
 * @async: (out): A pointer to store the async-flag in
 *
 * Get the format, minsize, maxsize and async-flag in the buffersize event.
 */
void
gst_event_parse_buffer_size (GstEvent * event, GstFormat * format,
    gint64 * minsize, gint64 * maxsize, gboolean * async)
{
  const GstStructure *structure;

  g_return_if_fail (GST_IS_EVENT (event));
  g_return_if_fail (GST_EVENT_TYPE (event) == GST_EVENT_BUFFERSIZE);

  structure = GST_EVENT_STRUCTURE (event);
  if (format)
    *format = (GstFormat)
        g_value_get_enum (gst_structure_id_get_value (structure,
            GST_QUARK (FORMAT)));
  if (minsize)
    *minsize =
        g_value_get_int64 (gst_structure_id_get_value (structure,
            GST_QUARK (MINSIZE)));
  if (maxsize)
    *maxsize =
        g_value_get_int64 (gst_structure_id_get_value (structure,
            GST_QUARK (MAXSIZE)));
  if (async)
    *async =
        g_value_get_boolean (gst_structure_id_get_value (structure,
            GST_QUARK (ASYNC)));
}

/**
 * gst_event_parse_qos:
 * @event: The event to query
 * @type: (out): A pointer to store the QoS type in
 * @proportion: (out): A pointer to store the proportion in
 * @diff: (out): A pointer to store the diff in
 * @timestamp: (out): A pointer to store the timestamp in
 *
 * Get the type, proportion, diff and timestamp in the qos event. See
 * gst_event_new_qos() for more information about the different QoS values.
 */
void
gst_event_parse_qos (GstEvent * event, GstQOSType * type,
    gdouble * proportion, GstClockTimeDiff * diff, GstClockTime * timestamp)
{
  const GstStructure *structure;

  g_return_if_fail (GST_IS_EVENT (event));
  g_return_if_fail (GST_EVENT_TYPE (event) == GST_EVENT_QOS);

  structure = GST_EVENT_STRUCTURE (event);
  if (type)
    *type = (GstQOSType)
        g_value_get_enum (gst_structure_id_get_value (structure,
            GST_QUARK (TYPE)));
  if (proportion)
    *proportion =
        g_value_get_double (gst_structure_id_get_value (structure,
            GST_QUARK (PROPORTION)));
  if (diff)
    *diff =
        g_value_get_int64 (gst_structure_id_get_value (structure,
            GST_QUARK (DIFF)));
  if (timestamp)
    *timestamp =
        g_value_get_uint64 (gst_structure_id_get_value (structure,
            GST_QUARK (TIMESTAMP)));
}

/**
 * gst_buffer_pool_config_set_allocator:
 * @config: a #GstBufferPool configuration
 * @allocator: a #GstAllocator
 * @params: #GstAllocationParams
 *
 * Set the @allocator and @params on @config.
 *
 * One of @allocator and @params can be NULL, but not both. When @allocator
 * is NULL, the default allocator of the pool will use the values in @param
 * to perform its allocation. When @param is NULL, the pool will use the
 * provided allocator with its default #GstAllocationParams.
 *
 * A call to gst_buffer_pool_set_config() can update the allocator and params
 * with the values that it is able to do. Some pools are, for example, not able
 * to operate with different allocators or cannot allocate with the values
 * specified in @params. Use gst_buffer_pool_get_config() to get the currently
 * used values.
 */
void
gst_buffer_pool_config_set_allocator (GstStructure * config,
    GstAllocator * allocator, const GstAllocationParams * params)
{
  g_return_if_fail (config != NULL);
  g_return_if_fail (allocator != NULL || params != NULL);

  gst_structure_id_set (config,
      GST_QUARK (ALLOCATOR), GST_TYPE_ALLOCATOR, allocator,
      GST_QUARK (PARAMS), GST_TYPE_ALLOCATION_PARAMS, params, NULL);
}

/**
 * gst_event_new_stream_start:
 * @stream_id: Identifier for this stream
 *
 * Create a new STREAM_START event. The stream start event can only
 * travel downstream synchronized with the buffer flow. It is expected
 * to be the first event that is sent for a new stream.
 *
 * Source elements, demuxers and other elements that create new streams
 * are supposed to send this event as the first event of a new stream. It
 * should not be send after a flushing seek or in similar situations
 * and is used to mark the beginning of a new logical stream. Elements
 * combining multiple streams must ensure that this event is only forwarded
 * downstream once and not for every single input stream.
 *
 * The @stream_id should be a unique string that consists of the upstream
 * stream-id, / as separator and a unique stream-id for this specific
 * stream. A new stream-id should only be created for a stream if the upstream
 * stream is split into (potentially) multiple new streams, e.g. in a demuxer,
 * but not for every single element in the pipeline.
 * gst_pad_create_stream_id() or gst_pad_create_stream_id_printf() can be
 * used to create a stream-id.
 *
 * Returns: (transfer full): the new STREAM_START event.
 */
GstEvent *
gst_event_new_stream_start (const gchar * stream_id)
{
  GstStructure *s;

  g_return_val_if_fail (stream_id != NULL, NULL);

  s = gst_structure_new_id (GST_QUARK (EVENT_STREAM_START),
      GST_QUARK (STREAM_ID), G_TYPE_STRING, stream_id, NULL);

  return gst_event_new_custom (GST_EVENT_STREAM_START, s);
}

/**
 * gst_event_new_flush_stop:
 * @reset_time: if time should be reset
 *
 * Allocate a new flush stop event. The flush stop event can be sent
 * upstream and downstream and travels serialized with the dataflow.
 * It is typically sent after sending a FLUSH_START event to make the
 * pads accept data again.
 *
 * Elements can process this event synchronized with the dataflow since
 * the preceeding FLUSH_START event stopped the dataflow.
 *
 * This event is typically generated to complete a seek and to resume
 * dataflow.
 *
 * Returns: (transfer full): a new flush stop event.
 */
GstEvent *
gst_event_new_flush_stop (gboolean reset_time)
{
  GstEvent *event;

  GST_CAT_INFO (GST_CAT_EVENT, "creating flush stop %d", reset_time);

  event = gst_event_new_custom (GST_EVENT_FLUSH_STOP,
      gst_structure_new_id (GST_QUARK (EVENT_FLUSH_STOP),
          GST_QUARK (RESET_TIME), G_TYPE_BOOLEAN, reset_time, NULL));

  return event;
}

/**
 * gst_event_new_toc_select:
 * @uid: UID in the TOC to start playback from.
 *
 * Generate a TOC select event with the given @uid. The purpose of the
 * TOC select event is to start playback based on the TOC's entry with the
 * given @uid.
 *
 * Returns: a new #GstEvent.
 */
GstEvent *
gst_event_new_toc_select (const gchar * uid)
{
  GstStructure *structure;

  g_return_val_if_fail (uid != NULL, NULL);

  GST_CAT_INFO (GST_CAT_EVENT, "creating toc select event for UID: %s", uid);

  structure = gst_structure_new_id (GST_QUARK (EVENT_TOC_SELECT),
      GST_QUARK (UID), G_TYPE_STRING, uid, NULL);

  return gst_event_new_custom (GST_EVENT_TOC_SELECT, structure);
}

/**
 * gst_buffer_pool_config_set_params:
 * @config: a #GstBufferPool configuration
 * @caps: caps for the buffers
 * @size: the size of each buffer, not including prefix and padding
 * @min_buffers: the minimum amount of buffers to allocate.
 * @max_buffers: the maximum amount of buffers to allocate or 0 for unlimited.
 *
 * Configure @config with the given parameters.
 */
void
gst_buffer_pool_config_set_params (GstStructure * config, GstCaps * caps,
    guint size, guint min_buffers, guint max_buffers)
{
  g_return_if_fail (config != NULL);
  g_return_if_fail (max_buffers == 0 || min_buffers <= max_buffers);
  g_return_if_fail (caps == NULL || gst_caps_is_fixed (caps));

  gst_structure_id_set (config,
      GST_QUARK (CAPS), GST_TYPE_CAPS, caps,
      GST_QUARK (SIZE), G_TYPE_UINT, size,
      GST_QUARK (MIN_BUFFERS), G_TYPE_UINT, min_buffers,
      GST_QUARK (MAX_BUFFERS), G_TYPE_UINT, max_buffers, NULL);
}

/**
 * gst_event_parse_gap:
 * @event: a #GstEvent of type #GST_EVENT_GAP
 * @timestamp: (out) (allow-none): location where to store the
 *     start time (pts) of the gap, or %NULL
 * @duration: (out) (allow-none): location where to store the duration of
 *     the gap, or %NULL
 *
 * Extract timestamp and duration from a new GAP event.
 */
void
gst_event_parse_gap (GstEvent * event, GstClockTime * timestamp,
    GstClockTime * duration)
{
  GstStructure *structure;

  g_return_if_fail (GST_IS_EVENT (event));
  g_return_if_fail (GST_EVENT_TYPE (event) == GST_EVENT_GAP);

  structure = GST_EVENT_STRUCTURE (event);
  gst_structure_id_get (structure,
      GST_QUARK (TIMESTAMP), GST_TYPE_CLOCK_TIME, timestamp,
      GST_QUARK (DURATION), GST_TYPE_CLOCK_TIME, duration, NULL);
}

/**
 * gst_event_parse_toc:
 * @event: a TOC event.
 * @toc: (out) (transfer full): pointer to #GstToc structure.
 * @updated: (out): pointer to store TOC updated flag.
 *
 * Parse a TOC @event and store the results in the given @toc and @updated locations.
 */
void
gst_event_parse_toc (GstEvent * event, GstToc ** toc, gboolean * updated)
{
  const GstStructure *structure;

  g_return_if_fail (event != NULL);
  g_return_if_fail (GST_EVENT_TYPE (event) == GST_EVENT_TOC);
  g_return_if_fail (toc != NULL);

  structure = gst_event_get_structure (event);

  gst_structure_id_get (structure,
      GST_QUARK (TOC), GST_TYPE_TOC, toc,
      GST_QUARK (UPDATED), G_TYPE_BOOLEAN, updated, NULL);
}

/**
 * gst_event_new_latency:
 * @latency: the new latency value
 *
 * Create a new latency event. The event is sent upstream from the sinks and
 * notifies elements that they should add an additional @latency to the
 * running time before synchronising against the clock.
 *
 * The latency is mostly used in live sinks and is always expressed in
 * the time format.
 *
 * Returns: (transfer full): a new #GstEvent
 */
GstEvent *
gst_event_new_latency (GstClockTime latency)
{
  GstEvent *event;
  GstStructure *structure;

  GST_CAT_INFO (GST_CAT_EVENT,
      "creating latency event %" GST_TIME_FORMAT, GST_TIME_ARGS (latency));

  structure = gst_structure_new_id (GST_QUARK (EVENT_LATENCY),
      GST_QUARK (LATENCY), G_TYPE_UINT64, latency, NULL);
  event = gst_event_new_custom (GST_EVENT_LATENCY, structure);

  return event;
}

/**
 * gst_buffer_pool_config_get_params:
 * @config: (transfer none): a #GstBufferPool configuration
 * @caps: (out) (transfer none) (allow-none): the caps of buffers
 * @size: (out) (allow-none): the size of each buffer, not including prefix and padding
 * @min_buffers: (out) (allow-none): the minimum amount of buffers to allocate.
 * @max_buffers: (out) (allow-none): the maximum amount of buffers to allocate or 0 for unlimited.
 *
 * Get the configuration values from @config.
 *
 * Returns: %TRUE if all parameters could be fetched.
 */
gboolean
gst_buffer_pool_config_get_params (GstStructure * config, GstCaps ** caps,
    guint * size, guint * min_buffers, guint * max_buffers)
{
  g_return_val_if_fail (config != NULL, FALSE);

  if (caps) {
    *caps = g_value_get_boxed (gst_structure_id_get_value (config,
            GST_QUARK (CAPS)));
  }
  return gst_structure_id_get (config,
      GST_QUARK (SIZE), G_TYPE_UINT, size,
      GST_QUARK (MIN_BUFFERS), G_TYPE_UINT, min_buffers,
      GST_QUARK (MAX_BUFFERS), G_TYPE_UINT, max_buffers, NULL);
}

/**
 * gst_event_new_caps:
 * @caps: (transfer none): a #GstCaps
 *
 * Create a new CAPS event for @caps. The caps event can only travel downstream
 * synchronized with the buffer flow and contains the format of the buffers
 * that will follow after the event.
 *
 * Returns: (transfer full): the new CAPS event.
 */
GstEvent *
gst_event_new_caps (GstCaps * caps)
{
  GstEvent *event;

  g_return_val_if_fail (caps != NULL, NULL);
  g_return_val_if_fail (gst_caps_is_fixed (caps), NULL);

  GST_CAT_INFO (GST_CAT_EVENT, "creating caps event %" GST_PTR_FORMAT, caps);

  event = gst_event_new_custom (GST_EVENT_CAPS,
      gst_structure_new_id (GST_QUARK (EVENT_CAPS),
          GST_QUARK (CAPS), GST_TYPE_CAPS, caps, NULL));

  return event;
}