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