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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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515 lines
13 KiB
C
515 lines
13 KiB
C
/* GStreamer
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* Copyright (C) <2010> Wim Taymans <wim.taymans@gmail.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 <string.h>
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#include <stdlib.h>
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#include "gstrtpgstdepay.h"
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GST_DEBUG_CATEGORY_STATIC (rtpgstdepay_debug);
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#define GST_CAT_DEFAULT (rtpgstdepay_debug)
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static GstStaticPadTemplate gst_rtp_gst_depay_src_template =
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GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS_ANY);
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static GstStaticPadTemplate gst_rtp_gst_depay_sink_template =
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GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("application/x-rtp, "
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"media = (string) \"application\", "
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"clock-rate = (int) 90000, " "encoding-name = (string) \"X-GST\"")
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);
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#define gst_rtp_gst_depay_parent_class parent_class
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G_DEFINE_TYPE (GstRtpGSTDepay, gst_rtp_gst_depay, GST_TYPE_RTP_BASE_DEPAYLOAD);
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static void gst_rtp_gst_depay_finalize (GObject * object);
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static GstStateChangeReturn gst_rtp_gst_depay_change_state (GstElement *
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element, GstStateChange transition);
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static void gst_rtp_gst_depay_reset (GstRtpGSTDepay * rtpgstdepay);
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static gboolean gst_rtp_gst_depay_setcaps (GstRTPBaseDepayload * depayload,
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GstCaps * caps);
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static GstBuffer *gst_rtp_gst_depay_process (GstRTPBaseDepayload * depayload,
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GstBuffer * buf);
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static void
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gst_rtp_gst_depay_class_init (GstRtpGSTDepayClass * klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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GstRTPBaseDepayloadClass *gstrtpbasedepayload_class;
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GST_DEBUG_CATEGORY_INIT (rtpgstdepay_debug, "rtpgstdepay", 0,
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"Gstreamer RTP Depayloader");
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gobject_class = (GObjectClass *) klass;
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gstelement_class = (GstElementClass *) klass;
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gstrtpbasedepayload_class = (GstRTPBaseDepayloadClass *) klass;
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gobject_class->finalize = gst_rtp_gst_depay_finalize;
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gstelement_class->change_state = gst_rtp_gst_depay_change_state;
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gst_element_class_add_pad_template (gstelement_class,
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gst_static_pad_template_get (&gst_rtp_gst_depay_src_template));
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gst_element_class_add_pad_template (gstelement_class,
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gst_static_pad_template_get (&gst_rtp_gst_depay_sink_template));
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gst_element_class_set_static_metadata (gstelement_class,
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"GStreamer depayloader", "Codec/Depayloader/Network",
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"Extracts GStreamer buffers from RTP packets",
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"Wim Taymans <wim.taymans@gmail.com>");
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gstrtpbasedepayload_class->set_caps = gst_rtp_gst_depay_setcaps;
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gstrtpbasedepayload_class->process = gst_rtp_gst_depay_process;
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}
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static void
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gst_rtp_gst_depay_init (GstRtpGSTDepay * rtpgstdepay)
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{
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rtpgstdepay->adapter = gst_adapter_new ();
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}
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static void
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gst_rtp_gst_depay_finalize (GObject * object)
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{
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GstRtpGSTDepay *rtpgstdepay;
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rtpgstdepay = GST_RTP_GST_DEPAY (object);
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gst_rtp_gst_depay_reset (rtpgstdepay);
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g_object_unref (rtpgstdepay->adapter);
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static void
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store_cache (GstRtpGSTDepay * rtpgstdepay, guint CV, GstCaps * caps)
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{
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if (rtpgstdepay->CV_cache[CV])
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gst_caps_unref (rtpgstdepay->CV_cache[CV]);
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rtpgstdepay->CV_cache[CV] = caps;
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}
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static void
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gst_rtp_gst_depay_reset (GstRtpGSTDepay * rtpgstdepay)
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{
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guint i;
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gst_adapter_clear (rtpgstdepay->adapter);
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rtpgstdepay->current_CV = 0;
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for (i = 0; i < 8; i++)
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store_cache (rtpgstdepay, i, NULL);
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}
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static gboolean
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gst_rtp_gst_depay_setcaps (GstRTPBaseDepayload * depayload, GstCaps * caps)
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{
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GstRtpGSTDepay *rtpgstdepay;
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GstStructure *structure;
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gint clock_rate;
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gboolean res;
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const gchar *capsenc;
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rtpgstdepay = GST_RTP_GST_DEPAY (depayload);
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structure = gst_caps_get_structure (caps, 0);
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if (!gst_structure_get_int (structure, "clock-rate", &clock_rate))
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clock_rate = 90000;
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depayload->clock_rate = clock_rate;
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capsenc = gst_structure_get_string (structure, "caps");
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if (capsenc) {
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GstCaps *outcaps;
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gsize out_len;
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gchar *capsstr;
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const gchar *capsver;
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guint CV;
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/* decode caps */
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capsstr = (gchar *) g_base64_decode (capsenc, &out_len);
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outcaps = gst_caps_from_string (capsstr);
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g_free (capsstr);
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/* parse version */
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capsver = gst_structure_get_string (structure, "capsversion");
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if (capsver) {
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CV = atoi (capsver);
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} else {
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/* no version, assume 0 */
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CV = 0;
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}
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/* store in cache */
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rtpgstdepay->current_CV = CV;
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gst_caps_ref (outcaps);
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store_cache (rtpgstdepay, CV, outcaps);
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res = gst_pad_set_caps (depayload->srcpad, outcaps);
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gst_caps_unref (outcaps);
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} else {
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GST_WARNING_OBJECT (depayload, "no caps given");
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rtpgstdepay->current_CV = -1;
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res = TRUE;
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}
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return res;
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}
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static gboolean
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read_length (GstRtpGSTDepay * rtpgstdepay, guint8 * data, guint size,
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guint * length, guint * skip)
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{
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guint b, len, offset;
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/* start reading the length, we need this to skip to the data later */
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len = offset = 0;
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do {
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if (offset >= size)
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return FALSE;
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b = data[offset++];
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len = (len << 7) | (b & 0x7f);
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} while (b & 0x80);
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/* check remaining buffer size */
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if (size - offset < len)
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return FALSE;
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*length = len;
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*skip = offset;
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return TRUE;
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}
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static GstCaps *
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read_caps (GstRtpGSTDepay * rtpgstdepay, GstBuffer * buf, guint * skip)
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{
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guint offset, length;
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GstCaps *caps;
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GstMapInfo map;
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gst_buffer_map (buf, &map, GST_MAP_READ);
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GST_DEBUG_OBJECT (rtpgstdepay, "buffer size %" G_GSIZE_FORMAT, map.size);
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if (!read_length (rtpgstdepay, map.data, map.size, &length, &offset))
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goto too_small;
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GST_DEBUG_OBJECT (rtpgstdepay, "parsing caps %s", &map.data[offset]);
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/* parse and store in cache */
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caps = gst_caps_from_string ((gchar *) & map.data[offset]);
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gst_buffer_unmap (buf, &map);
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*skip = length + offset;
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return caps;
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too_small:
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{
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GST_ELEMENT_WARNING (rtpgstdepay, STREAM, DECODE,
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("Buffer too small."), (NULL));
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gst_buffer_unmap (buf, &map);
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return NULL;
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}
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}
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static GstEvent *
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read_event (GstRtpGSTDepay * rtpgstdepay, guint type,
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GstBuffer * buf, guint * skip)
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{
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guint offset, length;
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GstStructure *s;
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GstEvent *event;
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GstEventType etype;
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gchar *end;
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GstMapInfo map;
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gst_buffer_map (buf, &map, GST_MAP_READ);
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GST_DEBUG_OBJECT (rtpgstdepay, "buffer size %" G_GSIZE_FORMAT, map.size);
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if (!read_length (rtpgstdepay, map.data, map.size, &length, &offset))
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goto too_small;
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GST_DEBUG_OBJECT (rtpgstdepay, "parsing event %s", &map.data[offset]);
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/* parse */
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s = gst_structure_from_string ((gchar *) & map.data[offset], &end);
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gst_buffer_unmap (buf, &map);
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if (s == NULL)
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goto parse_failed;
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switch (type) {
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case 1:
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etype = GST_EVENT_TAG;
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break;
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case 2:
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etype = GST_EVENT_CUSTOM_DOWNSTREAM;
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break;
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case 3:
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etype = GST_EVENT_CUSTOM_BOTH;
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break;
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default:
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goto unknown_event;
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}
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event = gst_event_new_custom (etype, s);
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*skip = length + offset;
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return event;
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too_small:
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{
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GST_ELEMENT_WARNING (rtpgstdepay, STREAM, DECODE,
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("Buffer too small."), (NULL));
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gst_buffer_unmap (buf, &map);
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return NULL;
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}
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parse_failed:
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{
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GST_WARNING_OBJECT (rtpgstdepay, "could not parse event");
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return NULL;
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}
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unknown_event:
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{
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GST_DEBUG_OBJECT (rtpgstdepay, "unknown event type");
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gst_structure_free (s);
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return NULL;
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}
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}
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static GstBuffer *
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gst_rtp_gst_depay_process (GstRTPBaseDepayload * depayload, GstBuffer * buf)
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{
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GstRtpGSTDepay *rtpgstdepay;
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GstBuffer *subbuf, *outbuf = NULL;
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gint payload_len;
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guint8 *payload;
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guint CV, frag_offset, avail, offset;
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GstRTPBuffer rtp = { NULL };
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rtpgstdepay = GST_RTP_GST_DEPAY (depayload);
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gst_rtp_buffer_map (buf, GST_MAP_READ, &rtp);
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payload_len = gst_rtp_buffer_get_payload_len (&rtp);
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if (payload_len <= 8)
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goto empty_packet;
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if (GST_BUFFER_IS_DISCONT (buf)) {
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GST_WARNING_OBJECT (rtpgstdepay, "DISCONT, clear adapter");
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gst_adapter_clear (rtpgstdepay->adapter);
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}
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payload = gst_rtp_buffer_get_payload (&rtp);
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/* strip off header
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*
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* 0 1 2 3
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* 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
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |C| CV |D|0|0|0| ETYPE | MBZ |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Frag_offset |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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frag_offset =
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(payload[4] << 24) | (payload[5] << 16) | (payload[6] << 8) | payload[7];
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avail = gst_adapter_available (rtpgstdepay->adapter);
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if (avail != frag_offset)
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goto wrong_frag;
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/* subbuffer skipping the 8 header bytes */
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subbuf = gst_rtp_buffer_get_payload_subbuffer (&rtp, 8, -1);
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gst_adapter_push (rtpgstdepay->adapter, subbuf);
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offset = 0;
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if (gst_rtp_buffer_get_marker (&rtp)) {
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guint avail;
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GstCaps *outcaps;
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/* take the buffer */
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avail = gst_adapter_available (rtpgstdepay->adapter);
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outbuf = gst_adapter_take_buffer (rtpgstdepay->adapter, avail);
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CV = (payload[0] >> 4) & 0x7;
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if (payload[0] & 0x80) {
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guint size;
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/* C bit, we have inline caps */
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outcaps = read_caps (rtpgstdepay, outbuf, &size);
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if (outcaps == NULL)
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goto no_caps;
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GST_DEBUG_OBJECT (rtpgstdepay,
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"inline caps %u, length %u, %" GST_PTR_FORMAT, CV, size, outcaps);
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store_cache (rtpgstdepay, CV, outcaps);
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/* skip caps */
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offset += size;
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avail -= size;
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}
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if (payload[1]) {
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guint size;
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GstEvent *event;
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/* we have an event */
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event = read_event (rtpgstdepay, payload[1], outbuf, &size);
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if (event == NULL)
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goto no_event;
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GST_DEBUG_OBJECT (rtpgstdepay,
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"inline event, length %u, %" GST_PTR_FORMAT, size, event);
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gst_pad_push_event (depayload->srcpad, event);
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/* no buffer after event */
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avail = 0;
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}
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if (avail) {
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if (offset != 0) {
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GstBuffer *temp;
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GST_DEBUG_OBJECT (rtpgstdepay, "sub buffer: offset %u, size %u", offset,
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avail);
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temp =
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gst_buffer_copy_region (outbuf, GST_BUFFER_COPY_ALL, offset, avail);
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gst_buffer_unref (outbuf);
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outbuf = temp;
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}
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/* see what caps we need */
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if (CV != rtpgstdepay->current_CV) {
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/* we need to switch caps, check if we have the caps */
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if ((outcaps = rtpgstdepay->CV_cache[CV]) == NULL)
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goto missing_caps;
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GST_DEBUG_OBJECT (rtpgstdepay,
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"need caps switch from %u to %u, %" GST_PTR_FORMAT,
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rtpgstdepay->current_CV, CV, outcaps);
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/* and set caps */
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if (gst_pad_set_caps (depayload->srcpad, outcaps))
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rtpgstdepay->current_CV = CV;
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}
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if (payload[0] & 0x8)
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GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
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} else {
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gst_buffer_unref (outbuf);
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outbuf = NULL;
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}
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}
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gst_rtp_buffer_unmap (&rtp);
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return outbuf;
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/* ERRORS */
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empty_packet:
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{
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GST_ELEMENT_WARNING (rtpgstdepay, STREAM, DECODE,
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("Empty Payload."), (NULL));
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gst_rtp_buffer_unmap (&rtp);
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return NULL;
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}
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wrong_frag:
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{
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gst_adapter_clear (rtpgstdepay->adapter);
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gst_rtp_buffer_unmap (&rtp);
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GST_LOG_OBJECT (rtpgstdepay, "wrong fragment, skipping");
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return NULL;
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}
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no_caps:
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{
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GST_WARNING_OBJECT (rtpgstdepay, "failed to parse caps");
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gst_buffer_unref (outbuf);
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gst_rtp_buffer_unmap (&rtp);
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return NULL;
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}
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no_event:
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{
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GST_WARNING_OBJECT (rtpgstdepay, "failed to parse event");
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gst_buffer_unref (outbuf);
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gst_rtp_buffer_unmap (&rtp);
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return NULL;
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}
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missing_caps:
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{
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GST_ELEMENT_WARNING (rtpgstdepay, STREAM, DECODE,
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("Missing caps %u.", CV), (NULL));
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gst_buffer_unref (outbuf);
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gst_rtp_buffer_unmap (&rtp);
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return NULL;
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}
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}
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static GstStateChangeReturn
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gst_rtp_gst_depay_change_state (GstElement * element, GstStateChange transition)
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{
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GstRtpGSTDepay *rtpgstdepay;
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GstStateChangeReturn ret;
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rtpgstdepay = GST_RTP_GST_DEPAY (element);
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switch (transition) {
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case GST_STATE_CHANGE_READY_TO_PAUSED:
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gst_rtp_gst_depay_reset (rtpgstdepay);
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break;
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default:
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break;
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}
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ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
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switch (transition) {
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case GST_STATE_CHANGE_PAUSED_TO_READY:
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gst_rtp_gst_depay_reset (rtpgstdepay);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
|
|
gboolean
|
|
gst_rtp_gst_depay_plugin_init (GstPlugin * plugin)
|
|
{
|
|
return gst_element_register (plugin, "rtpgstdepay",
|
|
GST_RANK_MARGINAL, GST_TYPE_RTP_GST_DEPAY);
|
|
}
|