gstreamer/gst/rtp/gstrtputils.c
Tim-Philipp Müller 4a28e649c3 rtp: cache meta tag quarks and add more utility functions for metas
Every g_quark_from_static_string() is a hash table lookup serialised
on the global quark lock in GLib. Let's just look up the two quarks
we need once and cache them locally for future use. While we're at it,
add new utility functions for the two most commonly used tags
(audio + video). Make first argument a gpointer so we don't have to
cast and make the code ugly. These are used for logging purposes
only anyway.
2017-05-24 13:32:10 +01:00

151 lines
4.3 KiB
C

/* GStreamer
* Copyright (C) 2015 Sebastian Dröge <sebastian@centricular.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.
*/
#include "gstrtputils.h"
typedef struct
{
GstElement *element;
GstBuffer *outbuf;
GQuark copy_tag;
} CopyMetaData;
GQuark rtp_quark_meta_tag_video;
GQuark rtp_quark_meta_tag_audio;
static gboolean
foreach_metadata_copy (GstBuffer * inbuf, GstMeta ** meta, gpointer user_data)
{
CopyMetaData *data = user_data;
GstElement *element = data->element;
GstBuffer *outbuf = data->outbuf;
GQuark copy_tag = data->copy_tag;
const GstMetaInfo *info = (*meta)->info;
const gchar *const *tags = gst_meta_api_type_get_tags (info->api);
if (!tags || (copy_tag != 0 && g_strv_length ((gchar **) tags) == 1
&& gst_meta_api_type_has_tag (info->api, copy_tag))) {
GstMetaTransformCopy copy_data = { FALSE, 0, -1 };
GST_DEBUG_OBJECT (element, "copy metadata %s", g_type_name (info->api));
/* simply copy then */
info->transform_func (outbuf, *meta, inbuf,
_gst_meta_transform_copy, &copy_data);
} else {
GST_DEBUG_OBJECT (element, "not copying metadata %s",
g_type_name (info->api));
}
return TRUE;
}
/* TODO: Should probably make copy_tag an array at some point */
void
gst_rtp_copy_meta (GstElement * element, GstBuffer * outbuf, GstBuffer * inbuf,
GQuark copy_tag)
{
CopyMetaData data = { element, outbuf, copy_tag };
gst_buffer_foreach_meta (inbuf, foreach_metadata_copy, &data);
}
void
gst_rtp_copy_video_meta (gpointer element, GstBuffer * outbuf,
GstBuffer * inbuf)
{
gst_rtp_copy_meta (element, outbuf, inbuf, rtp_quark_meta_tag_video);
}
void
gst_rtp_copy_audio_meta (gpointer element, GstBuffer * outbuf,
GstBuffer * inbuf)
{
gst_rtp_copy_meta (element, outbuf, inbuf, rtp_quark_meta_tag_audio);
}
typedef struct
{
GstElement *element;
GQuark keep_tag;
} DropMetaData;
static gboolean
foreach_metadata_drop (GstBuffer * inbuf, GstMeta ** meta, gpointer user_data)
{
DropMetaData *data = user_data;
GstElement *element = data->element;
GQuark keep_tag = data->keep_tag;
const GstMetaInfo *info = (*meta)->info;
const gchar *const *tags = gst_meta_api_type_get_tags (info->api);
if (!tags || (keep_tag != 0 && g_strv_length ((gchar **) tags) == 1
&& gst_meta_api_type_has_tag (info->api, keep_tag))) {
GST_DEBUG_OBJECT (element, "keeping metadata %s", g_type_name (info->api));
} else {
GST_DEBUG_OBJECT (element, "dropping metadata %s", g_type_name (info->api));
*meta = NULL;
}
return TRUE;
}
/* TODO: Should probably make keep_tag an array at some point */
void
gst_rtp_drop_meta (GstElement * element, GstBuffer * buf, GQuark keep_tag)
{
DropMetaData data = { element, keep_tag };
gst_buffer_foreach_meta (buf, foreach_metadata_drop, &data);
}
void
gst_rtp_drop_non_audio_meta (gpointer element, GstBuffer * buf)
{
gst_rtp_drop_meta (element, buf, rtp_quark_meta_tag_audio);
}
void
gst_rtp_drop_non_video_meta (gpointer element, GstBuffer * buf)
{
gst_rtp_drop_meta (element, buf, rtp_quark_meta_tag_video);
}
/* Stolen from bad/gst/mpegtsdemux/payloader_parsers.c */
/* variable length Exp-Golomb parsing according to H.265 spec section 9.2*/
gboolean
gst_rtp_read_golomb (GstBitReader * br, guint32 * value)
{
guint8 b, leading_zeros = -1;
*value = 1;
for (b = 0; !b; leading_zeros++) {
if (!gst_bit_reader_get_bits_uint8 (br, &b, 1))
return FALSE;
*value *= 2;
}
*value = (*value >> 1) - 1;
if (leading_zeros > 0) {
guint32 tmp = 0;
if (!gst_bit_reader_get_bits_uint32 (br, &tmp, leading_zeros))
return FALSE;
*value += tmp;
}
return TRUE;
}