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/* GStreamer
* Copyright (C) <2016> Stian Selnes <stian@pexip.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstrtpmeta.h"
#include <string.h>
/**
* SECTION:gstrtpmeta
* @title: GstMeta for RTP
* @short_description: RTP related GstMeta
*
*/
/**
* gst_buffer_add_rtp_source_meta:
* @buffer: a #GstBuffer
* @ssrc: (allow-none) (transfer none): pointer to the SSRC
* @csrc: (allow-none) (transfer none): pointer to the CSRCs
* @csrc_count: number of elements in @csrc
*
* Attaches RTP source information to @buffer.
*
* Returns: (transfer none): the #GstRTPSourceMeta on @buffer.
*
* Since: 1.16
*/
GstRTPSourceMeta *
gst_buffer_add_rtp_source_meta (GstBuffer * buffer, const guint32 * ssrc,
const guint * csrc, guint csrc_count)
{
gint i;
GstRTPSourceMeta *meta;
g_return_val_if_fail (buffer != NULL, NULL);
g_return_val_if_fail (csrc_count <= GST_RTP_SOURCE_META_MAX_CSRC_COUNT, NULL);
g_return_val_if_fail (csrc_count == 0 || csrc != NULL, NULL);
meta = (GstRTPSourceMeta *) gst_buffer_add_meta (buffer,
GST_RTP_SOURCE_META_INFO, NULL);
if (!meta)
return NULL;
if (ssrc != NULL) {
meta->ssrc = *ssrc;
meta->ssrc_valid = TRUE;
} else {
meta->ssrc_valid = FALSE;
}
meta->csrc_count = csrc_count;
for (i = 0; i < csrc_count; i++) {
meta->csrc[i] = csrc[i];
}
return meta;
}
/**
* gst_buffer_get_rtp_source_meta:
* @buffer: a #GstBuffer
*
* Find the #GstRTPSourceMeta on @buffer.
*
* Returns: (transfer none): the #GstRTPSourceMeta or %NULL when there
* is no such metadata on @buffer.
*
* Since: 1.16
*/
GstRTPSourceMeta *
gst_buffer_get_rtp_source_meta (GstBuffer * buffer)
{
return (GstRTPSourceMeta *) gst_buffer_get_meta (buffer,
gst_rtp_source_meta_api_get_type ());
}
static gboolean
gst_rtp_source_meta_transform (GstBuffer * dst, GstMeta * meta,
GstBuffer * src, GQuark type, gpointer data)
{
if (GST_META_TRANSFORM_IS_COPY (type)) {
GstRTPSourceMeta *smeta = (GstRTPSourceMeta *) meta;
GstRTPSourceMeta *dmeta;
guint32 *ssrc = smeta->ssrc_valid ? &smeta->ssrc : NULL;
dmeta = gst_buffer_add_rtp_source_meta (dst, ssrc, smeta->csrc,
smeta->csrc_count);
if (dmeta == NULL)
return FALSE;
} else {
/* return FALSE, if transform type is not supported */
return FALSE;
}
return TRUE;
}
/**
* gst_rtp_source_meta_get_source_count:
* @meta: a #GstRTPSourceMeta
*
* Count the total number of RTP sources found in @meta, both SSRC and CSRC.
*
* Returns: The number of RTP sources
*
* Since: 1.16
*/
guint
gst_rtp_source_meta_get_source_count (const GstRTPSourceMeta * meta)
{
/* Never return more than a count of 15 so that the returned value
* conveniently can be used as argument 'csrc_count' in
* gst_rtp_buffer-functions. */
guint ssrc_count = meta->ssrc_valid ? 1 : 0;
return MIN (meta->csrc_count + ssrc_count, 15);
}
/**
* gst_rtp_source_meta_set_ssrc:
* @meta: a #GstRTPSourceMeta
* @ssrc: (allow-none) (transfer none): pointer to the SSRC
*
* Sets @ssrc in @meta. If @ssrc is %NULL the ssrc of @meta will be unset.
*
* Returns: %TRUE on success, %FALSE otherwise.
*
* Since: 1.16
**/
gboolean
gst_rtp_source_meta_set_ssrc (GstRTPSourceMeta * meta, guint32 * ssrc)
{
if (ssrc != NULL) {
meta->ssrc = *ssrc;
meta->ssrc_valid = TRUE;
} else {
meta->ssrc_valid = FALSE;
}
return TRUE;
}
/**
* gst_rtp_source_meta_append_csrc:
* @meta: a #GstRTPSourceMeta
* @csrc: the csrcs to append
* @csrc_count: number of elements in @csrc
*
* Appends @csrc to the list of contributing sources in @meta.
*
* Returns: %TRUE if all elements in @csrc was added, %FALSE otherwise.
*
* Since: 1.16
**/
gboolean
gst_rtp_source_meta_append_csrc (GstRTPSourceMeta * meta, const guint32 * csrc,
guint csrc_count)
{
gint i;
guint new_csrc_count = meta->csrc_count + csrc_count;
if (new_csrc_count > GST_RTP_SOURCE_META_MAX_CSRC_COUNT)
return FALSE;
for (i = 0; i < csrc_count; i++)
meta->csrc[meta->csrc_count + i] = csrc[i];
meta->csrc_count = new_csrc_count;
return TRUE;
}
GType
gst_rtp_source_meta_api_get_type (void)
{
static GType type = 0;
static const gchar *tags[] = { NULL };
if (g_once_init_enter (&type)) {
GType _type = gst_meta_api_type_register ("GstRTPSourceMetaAPI", tags);
g_once_init_leave (&type, _type);
}
return type;
}
static gboolean
gst_rtp_source_meta_init (GstMeta * meta, gpointer params, GstBuffer * buffer)
{
GstRTPSourceMeta *dmeta = (GstRTPSourceMeta *) meta;
dmeta->ssrc_valid = FALSE;
dmeta->csrc_count = 0;
return TRUE;
}
const GstMetaInfo *
gst_rtp_source_meta_get_info (void)
{
static const GstMetaInfo *rtp_source_meta_info = NULL;
if (g_once_init_enter (&rtp_source_meta_info)) {
const GstMetaInfo *meta = gst_meta_register (GST_RTP_SOURCE_META_API_TYPE,
"GstRTPSourceMeta",
sizeof (GstRTPSourceMeta),
gst_rtp_source_meta_init,
(GstMetaFreeFunction) NULL,
gst_rtp_source_meta_transform);
g_once_init_leave (&rtp_source_meta_info, meta);
}
return rtp_source_meta_info;
}
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