mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-03 16:09:39 +00:00
f2f31ec50f
There is no need to have two identical implementations of the read_golomb function. https://bugzilla.gnome.org/show_bug.cgi?id=761606
122 lines
3.6 KiB
C
122 lines
3.6 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;
|
|
|
|
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, ©_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);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
/* 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;
|
|
}
|