mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-09-09 05:38:58 +00:00
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.
198 lines
6 KiB
C
198 lines
6 KiB
C
/* GStreamer
|
|
* Copyright (C) <2006> Wim Taymans <wim.taymans@gmail.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 <gst/rtp/gstrtpbuffer.h>
|
|
#include <gst/video/video.h>
|
|
|
|
#include <string.h>
|
|
#include "gstrtpmpvdepay.h"
|
|
#include "gstrtputils.h"
|
|
|
|
GST_DEBUG_CATEGORY_STATIC (rtpmpvdepay_debug);
|
|
#define GST_CAT_DEFAULT (rtpmpvdepay_debug)
|
|
|
|
/* FIXME, we set the mpeg version to 2, we should ideally be looking at contents
|
|
* of the stream to figure out the version */
|
|
static GstStaticPadTemplate gst_rtp_mpv_depay_src_template =
|
|
GST_STATIC_PAD_TEMPLATE ("src",
|
|
GST_PAD_SRC,
|
|
GST_PAD_ALWAYS,
|
|
GST_STATIC_CAPS
|
|
("video/mpeg, mpegversion = (int) 2, systemstream = (boolean) FALSE")
|
|
);
|
|
|
|
static GstStaticPadTemplate gst_rtp_mpv_depay_sink_template =
|
|
GST_STATIC_PAD_TEMPLATE ("sink",
|
|
GST_PAD_SINK,
|
|
GST_PAD_ALWAYS,
|
|
GST_STATIC_CAPS ("application/x-rtp, "
|
|
"media = (string) \"video\", "
|
|
"clock-rate = (int) 90000, " "encoding-name = (string) \"MPV\";"
|
|
"application/x-rtp, "
|
|
"media = (string) \"video\", "
|
|
"payload = (int) " GST_RTP_PAYLOAD_MPV_STRING ", "
|
|
"clock-rate = (int) 90000")
|
|
);
|
|
|
|
G_DEFINE_TYPE (GstRtpMPVDepay, gst_rtp_mpv_depay, GST_TYPE_RTP_BASE_DEPAYLOAD);
|
|
|
|
static gboolean gst_rtp_mpv_depay_setcaps (GstRTPBaseDepayload * depayload,
|
|
GstCaps * caps);
|
|
static GstBuffer *gst_rtp_mpv_depay_process (GstRTPBaseDepayload * depayload,
|
|
GstRTPBuffer * rtp);
|
|
|
|
static void
|
|
gst_rtp_mpv_depay_class_init (GstRtpMPVDepayClass * klass)
|
|
{
|
|
GstElementClass *gstelement_class;
|
|
GstRTPBaseDepayloadClass *gstrtpbasedepayload_class;
|
|
|
|
gstelement_class = (GstElementClass *) klass;
|
|
gstrtpbasedepayload_class = (GstRTPBaseDepayloadClass *) klass;
|
|
|
|
gst_element_class_add_static_pad_template (gstelement_class,
|
|
&gst_rtp_mpv_depay_src_template);
|
|
gst_element_class_add_static_pad_template (gstelement_class,
|
|
&gst_rtp_mpv_depay_sink_template);
|
|
|
|
gst_element_class_set_static_metadata (gstelement_class,
|
|
"RTP MPEG video depayloader", "Codec/Depayloader/Network/RTP",
|
|
"Extracts MPEG video from RTP packets (RFC 2250)",
|
|
"Wim Taymans <wim.taymans@gmail.com>");
|
|
|
|
gstrtpbasedepayload_class->set_caps = gst_rtp_mpv_depay_setcaps;
|
|
gstrtpbasedepayload_class->process_rtp_packet = gst_rtp_mpv_depay_process;
|
|
|
|
GST_DEBUG_CATEGORY_INIT (rtpmpvdepay_debug, "rtpmpvdepay", 0,
|
|
"MPEG Video RTP Depayloader");
|
|
}
|
|
|
|
static void
|
|
gst_rtp_mpv_depay_init (GstRtpMPVDepay * rtpmpvdepay)
|
|
{
|
|
}
|
|
|
|
static gboolean
|
|
gst_rtp_mpv_depay_setcaps (GstRTPBaseDepayload * depayload, GstCaps * caps)
|
|
{
|
|
GstStructure *structure;
|
|
gint clock_rate;
|
|
GstCaps *outcaps;
|
|
gboolean res;
|
|
|
|
structure = gst_caps_get_structure (caps, 0);
|
|
|
|
if (!gst_structure_get_int (structure, "clock-rate", &clock_rate))
|
|
clock_rate = 90000; /* default */
|
|
depayload->clock_rate = clock_rate;
|
|
|
|
outcaps = gst_caps_new_simple ("video/mpeg",
|
|
"mpegversion", G_TYPE_INT, 2,
|
|
"systemstream", G_TYPE_BOOLEAN, FALSE, NULL);
|
|
res = gst_pad_set_caps (depayload->srcpad, outcaps);
|
|
gst_caps_unref (outcaps);
|
|
|
|
return res;
|
|
}
|
|
|
|
static GstBuffer *
|
|
gst_rtp_mpv_depay_process (GstRTPBaseDepayload * depayload, GstRTPBuffer * rtp)
|
|
{
|
|
GstRtpMPVDepay *rtpmpvdepay;
|
|
GstBuffer *outbuf = NULL;
|
|
|
|
rtpmpvdepay = GST_RTP_MPV_DEPAY (depayload);
|
|
|
|
{
|
|
gint payload_len, payload_header;
|
|
guint8 *payload;
|
|
guint8 T;
|
|
|
|
payload_len = gst_rtp_buffer_get_payload_len (rtp);
|
|
payload = gst_rtp_buffer_get_payload (rtp);
|
|
payload_header = 0;
|
|
|
|
if (payload_len <= 4)
|
|
goto empty_packet;
|
|
|
|
/* 3.4 MPEG Video-specific header
|
|
*
|
|
* 0 1 2 3
|
|
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* | MBZ |T| TR | |N|S|B|E| P | | BFC | | FFC |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* AN FBV FFV
|
|
*/
|
|
T = (payload[0] & 0x04);
|
|
|
|
payload_len -= 4;
|
|
payload_header += 4;
|
|
payload += 4;
|
|
|
|
if (T) {
|
|
/*
|
|
* 3.4.1 MPEG-2 Video-specific header extension
|
|
*
|
|
* 0 1 2 3
|
|
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* |X|E|f_[0,0]|f_[0,1]|f_[1,0]|f_[1,1]| DC| PS|T|P|C|Q|V|A|R|H|G|D|
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
*/
|
|
if (payload_len <= 4)
|
|
goto empty_packet;
|
|
|
|
payload_len -= 4;
|
|
payload_header += 4;
|
|
payload += 4;
|
|
}
|
|
|
|
outbuf = gst_rtp_buffer_get_payload_subbuffer (rtp, payload_header, -1);
|
|
|
|
if (outbuf) {
|
|
GST_DEBUG_OBJECT (rtpmpvdepay,
|
|
"gst_rtp_mpv_depay_chain: pushing buffer of size %" G_GSIZE_FORMAT,
|
|
gst_buffer_get_size (outbuf));
|
|
gst_rtp_drop_non_video_meta (rtpmpvdepay, outbuf);
|
|
|
|
}
|
|
}
|
|
|
|
return outbuf;
|
|
|
|
/* ERRORS */
|
|
empty_packet:
|
|
{
|
|
GST_ELEMENT_WARNING (rtpmpvdepay, STREAM, DECODE,
|
|
(NULL), ("Empty payload."));
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
gboolean
|
|
gst_rtp_mpv_depay_plugin_init (GstPlugin * plugin)
|
|
{
|
|
return gst_element_register (plugin, "rtpmpvdepay",
|
|
GST_RANK_SECONDARY, GST_TYPE_RTP_MPV_DEPAY);
|
|
}
|