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546 lines
15 KiB
C
546 lines
15 KiB
C
/* GStreamer RTP ASF depayloader
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* Copyright (C) 2006 Tim-Philipp Müller <tim centricular net>
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* 2009 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 "gstasfelements.h"
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#include "gstrtpasfdepay.h"
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#include <gst/rtp/gstrtpbuffer.h>
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#include <string.h>
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#include <stdlib.h>
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GST_DEBUG_CATEGORY_STATIC (rtpasfdepayload_debug);
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#define GST_CAT_DEFAULT rtpasfdepayload_debug
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static GstStaticPadTemplate src_factory = 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 ("video/x-ms-asf")
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);
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/* Other parameters: config, maxps */
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#define SINK_CAPS \
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"application/x-rtp, " \
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"media = (string) { \"application\", \"video\", \"audio\" }, " \
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"payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", " \
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"clock-rate = (int) [1, MAX ], " \
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"encoding-name = (string) \"X-ASF-PF\""
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static GstStaticPadTemplate sink_factory = 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 (SINK_CAPS)
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);
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#define gst_rtp_asf_depay_parent_class parent_class
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G_DEFINE_TYPE (GstRtpAsfDepay, gst_rtp_asf_depay, GST_TYPE_RTP_BASE_DEPAYLOAD);
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GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (rtpasfdepay, "rtpasfdepay",
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GST_RANK_MARGINAL, GST_TYPE_RTP_ASF_DEPAY, asf_element_init (plugin));
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static void gst_rtp_asf_depay_finalize (GObject * object);
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static GstStateChangeReturn gst_rtp_asf_depay_change_state (GstElement *
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element, GstStateChange transition);
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static gboolean gst_rtp_asf_depay_setcaps (GstRTPBaseDepayload * depay,
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GstCaps * caps);
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static GstBuffer *gst_rtp_asf_depay_process (GstRTPBaseDepayload * basedepay,
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GstBuffer * buf);
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static void
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gst_rtp_asf_depay_class_init (GstRtpAsfDepayClass * 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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gobject_class = (GObjectClass *) klass;
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gstelement_class = (GstElementClass *) klass;
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gstrtpbasedepayload_class = (GstRTPBaseDepayloadClass *) klass;
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gst_element_class_add_static_pad_template (gstelement_class, &src_factory);
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gst_element_class_add_static_pad_template (gstelement_class, &sink_factory);
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gst_element_class_set_static_metadata (gstelement_class,
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"RTP ASF packet depayloader", "Codec/Depayloader/Network",
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"Extracts ASF streams from RTP",
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"Tim-Philipp Müller <tim centricular net>, "
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"Wim Taymans <wim.taymans@gmail.com>");
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gobject_class->finalize = gst_rtp_asf_depay_finalize;
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gstelement_class->change_state =
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GST_DEBUG_FUNCPTR (gst_rtp_asf_depay_change_state);
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gstrtpbasedepayload_class->set_caps =
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GST_DEBUG_FUNCPTR (gst_rtp_asf_depay_setcaps);
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gstrtpbasedepayload_class->process =
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GST_DEBUG_FUNCPTR (gst_rtp_asf_depay_process);
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GST_DEBUG_CATEGORY_INIT (rtpasfdepayload_debug, "rtpasfdepayload", 0,
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"RTP asf depayloader element");
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}
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static void
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gst_rtp_asf_depay_init (GstRtpAsfDepay * depay)
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{
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depay->adapter = gst_adapter_new ();
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}
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static void
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gst_rtp_asf_depay_finalize (GObject * object)
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{
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GstRtpAsfDepay *depay;
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depay = GST_RTP_ASF_DEPAY (object);
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g_object_unref (depay->adapter);
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static const guint8 asf_marker[16] = { 0x30, 0x26, 0xb2, 0x75, 0x8e, 0x66,
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0xcf, 0x11, 0xa6, 0xd9, 0x00, 0xaa, 0x00, 0x62, 0xce, 0x6c
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};
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static gboolean
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gst_rtp_asf_depay_setcaps (GstRTPBaseDepayload * depayload, GstCaps * caps)
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{
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GstRtpAsfDepay *depay;
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GstStructure *s;
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const gchar *config_str, *ps_string;
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GstBuffer *buf;
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GstCaps *src_caps;
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guint8 *headers;
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gsize headers_len;
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gint clock_rate;
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depay = GST_RTP_ASF_DEPAY (depayload);
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s = gst_caps_get_structure (caps, 0);
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if (!gst_structure_get_int (s, "clock-rate", &clock_rate) || clock_rate < 0)
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clock_rate = 1000;
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depayload->clock_rate = clock_rate;
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/* config contains the asf headers in base64 coding */
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config_str = gst_structure_get_string (s, "config");
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if (config_str == NULL || *config_str == '\0')
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goto no_config;
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ps_string = gst_structure_get_string (s, "maxps");
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if (ps_string == NULL || *ps_string == '\0')
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goto no_packetsize;
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if (depay->packet_size) {
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/* header sent again following seek;
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* discard to avoid confusing upstream */
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if (depay->packet_size == atoi (ps_string)) {
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goto duplicate_header;
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} else {
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/* since we should fiddle with downstream state to handle this */
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goto refuse_renegotiation;
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}
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} else
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depay->packet_size = atoi (ps_string);
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if (depay->packet_size <= 16)
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goto invalid_packetsize;
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headers = (guint8 *) g_base64_decode (config_str, &headers_len);
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if (headers == NULL || headers_len < 16
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|| memcmp (headers, asf_marker, 16) != 0)
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goto invalid_headers;
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src_caps = gst_caps_new_empty_simple ("video/x-ms-asf");
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gst_pad_set_caps (depayload->srcpad, src_caps);
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gst_caps_unref (src_caps);
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buf = gst_buffer_new ();
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gst_buffer_append_memory (buf,
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gst_memory_new_wrapped (0, headers, headers_len, 0, headers_len, headers,
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g_free));
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gst_rtp_base_depayload_push (depayload, buf);
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return TRUE;
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/* ERRORS */
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no_config:
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{
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GST_WARNING_OBJECT (depay, "caps without 'config' field with asf headers");
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return FALSE;
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}
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no_packetsize:
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{
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GST_WARNING_OBJECT (depay, "caps without 'maxps' (packet size) field");
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return FALSE;
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}
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invalid_packetsize:
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{
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GST_WARNING_OBJECT (depay, "packet size %u invalid", depay->packet_size);
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return FALSE;
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}
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invalid_headers:
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{
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GST_WARNING_OBJECT (depay, "headers don't look like valid ASF headers");
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g_free (headers);
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return FALSE;
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}
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duplicate_header:
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{
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GST_DEBUG_OBJECT (depayload, "discarding duplicate header");
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return TRUE;
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}
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refuse_renegotiation:
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{
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GST_WARNING_OBJECT (depayload, "cannot renegotiate to different header");
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return FALSE;
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}
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}
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static gint
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field_size (guint8 field)
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{
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switch (field) {
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/* DWORD - 32 bits */
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case 3:
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return 4;
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/* WORD - 16 bits */
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case 2:
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return 2;
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/* BYTE - 8 bits */
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case 1:
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return 1;
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/* non-exitent */
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case 0:
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default:
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return 0;
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}
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}
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/* Set the padding field to te correct value as the spec
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* says it should be se to 0 in the rtp packets
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*/
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static GstBuffer *
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gst_rtp_asf_depay_update_padding (GstRtpAsfDepay * depayload, GstBuffer * buf)
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{
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GstBuffer *result;
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GstMapInfo map;
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guint8 *data;
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gint offset = 0;
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guint8 aux;
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guint8 seq_type;
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guint8 pad_type;
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guint8 pkt_type;
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gsize plen, padding;
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plen = gst_buffer_get_size (buf);
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if (plen == depayload->packet_size)
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return buf;
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padding = depayload->packet_size - plen;
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GST_LOG_OBJECT (depayload,
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"padding buffer size %" G_GSIZE_FORMAT " to packet size %d", plen,
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depayload->packet_size);
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result = gst_buffer_new_and_alloc (depayload->packet_size);
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gst_buffer_map (result, &map, GST_MAP_READ);
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data = map.data;
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memset (data + plen, 0, padding);
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gst_buffer_extract (buf, 0, data, plen);
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gst_buffer_unref (buf);
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aux = data[offset++];
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if (aux & 0x80) {
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guint8 err_len = 0;
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if (aux & 0x60) {
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GST_WARNING_OBJECT (depayload, "Error correction length type should be "
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"set to 0");
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/* this packet doesn't follow the spec */
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gst_buffer_unmap (result, &map);
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return result;
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}
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err_len = aux & 0x0F;
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offset += err_len;
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aux = data[offset++];
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}
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seq_type = (aux >> 1) & 0x3;
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pad_type = (aux >> 3) & 0x3;
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pkt_type = (aux >> 5) & 0x3;
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offset += 1; /* skip property flags */
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offset += field_size (pkt_type); /* skip packet length */
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offset += field_size (seq_type); /* skip sequence field */
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/* write padding */
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switch (pad_type) {
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/* DWORD */
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case 3:
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GST_WRITE_UINT32_LE (&(data[offset]), padding);
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break;
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/* WORD */
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case 2:
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GST_WRITE_UINT16_LE (&(data[offset]), padding);
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break;
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/* BYTE */
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case 1:
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data[offset] = (guint8) padding;
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break;
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/* non-existent */
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case 0:
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default:
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break;
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}
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gst_buffer_unmap (result, &map);
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return result;
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}
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/* Docs: 'RTSP Protocol PDF' document from http://sdp.ppona.com/ (page 8) */
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static GstBuffer *
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gst_rtp_asf_depay_process (GstRTPBaseDepayload * depayload, GstBuffer * buf)
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{
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GstRtpAsfDepay *depay;
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const guint8 *payload;
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GstBuffer *outbuf;
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gboolean S, L, R, D, I;
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guint payload_len, hdr_len, offset;
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guint len_offs;
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GstClockTime timestamp;
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GstRTPBuffer rtpbuf = { NULL };
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depay = GST_RTP_ASF_DEPAY (depayload);
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/* flush remaining data on discont */
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if (GST_BUFFER_IS_DISCONT (buf)) {
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GST_LOG_OBJECT (depay, "got DISCONT");
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gst_adapter_clear (depay->adapter);
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depay->discont = TRUE;
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}
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gst_rtp_buffer_map (buf, GST_MAP_READ, &rtpbuf);
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timestamp = GST_BUFFER_TIMESTAMP (buf);
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payload_len = gst_rtp_buffer_get_payload_len (&rtpbuf);
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payload = gst_rtp_buffer_get_payload (&rtpbuf);
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offset = 0;
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GST_LOG_OBJECT (depay, "got payload len of %u", payload_len);
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do {
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guint packet_len;
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/* packet header is at least 4 bytes */
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if (payload_len < 4)
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goto too_small;
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/* 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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* |S|L|R|D|I|RES | Length/Offset |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Relative Timestamp (optional) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Duration (optional) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | LocationId (optional) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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* S: packet contains a keyframe.
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* L: If 1, Length/Offset contains length, else contains the byte offset
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* of the fragment's first byte counted from the beginning of the
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* complete ASF data packet.
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* R: relative timestamp present
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* D: duration present
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* I: locationid present
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*/
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S = ((payload[0] & 0x80) != 0);
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L = ((payload[0] & 0x40) != 0);
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R = ((payload[0] & 0x20) != 0);
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D = ((payload[0] & 0x10) != 0);
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I = ((payload[0] & 0x08) != 0);
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hdr_len = 4;
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len_offs = (payload[1] << 16) | (payload[2] << 8) | payload[3];
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if (R) {
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GST_DEBUG ("Relative timestamp field present : %u",
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GST_READ_UINT32_BE (payload + hdr_len));
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hdr_len += 4;
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}
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if (D) {
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GST_DEBUG ("Duration field present : %u",
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GST_READ_UINT32_BE (payload + hdr_len));
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hdr_len += 4;
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}
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if (I) {
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GST_DEBUG ("LocationId field present : %u",
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GST_READ_UINT32_BE (payload + hdr_len));
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hdr_len += 4;
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}
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GST_LOG_OBJECT (depay, "S %d, L %d, R %d, D %d, I %d", S, L, R, D, I);
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GST_LOG_OBJECT (depay, "payload_len:%d, hdr_len:%d, len_offs:%d",
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payload_len, hdr_len, len_offs);
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if (payload_len < hdr_len)
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goto too_small;
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/* skip headers */
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payload_len -= hdr_len;
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payload += hdr_len;
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offset += hdr_len;
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if (L) {
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/* L bit set, len contains the length of the packet */
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packet_len = len_offs;
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} else {
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/* else it contains an offset which we don't handle yet */
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GST_LOG_OBJECT (depay, "We have a fragmented packet");
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packet_len = payload_len;
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}
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if (packet_len > payload_len)
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packet_len = payload_len;
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GST_LOG_OBJECT (depay, "packet len %u, payload len %u, packet_size:%u",
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packet_len, payload_len, depay->packet_size);
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if (!L) {
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guint available;
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GstBuffer *sub;
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/* Fragmented packet handling */
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outbuf = NULL;
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if (len_offs == (available = gst_adapter_available (depay->adapter))) {
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/* fragment aligns with what we have, add it */
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GST_LOG_OBJECT (depay, "collecting fragment");
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sub =
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gst_rtp_buffer_get_payload_subbuffer (&rtpbuf, offset, packet_len);
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gst_adapter_push (depay->adapter, sub);
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/* RTP marker bit M is set if this is last fragment */
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if (gst_rtp_buffer_get_marker (&rtpbuf)) {
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GST_LOG_OBJECT (depay, "last fragment, assembling packet");
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outbuf =
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gst_adapter_take_buffer (depay->adapter, available + packet_len);
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}
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} else {
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if (available) {
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GST_WARNING_OBJECT (depay, "Offset doesn't match previous data?!");
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GST_DEBUG_OBJECT (depay, "clearing for re-sync");
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gst_adapter_clear (depay->adapter);
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} else
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GST_DEBUG_OBJECT (depay, "waiting for start of packet");
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}
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} else {
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GST_LOG_OBJECT (depay, "collecting packet");
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outbuf =
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gst_rtp_buffer_get_payload_subbuffer (&rtpbuf, offset, packet_len);
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}
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/* If we haven't completed a full ASF packet, return */
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if (!outbuf)
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return NULL;
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outbuf = gst_rtp_asf_depay_update_padding (depay, outbuf);
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if (!S)
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GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
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if (depay->discont) {
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GST_LOG_OBJECT (depay, "setting DISCONT");
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GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT);
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depay->discont = FALSE;
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}
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GST_BUFFER_TIMESTAMP (outbuf) = timestamp;
|
|
|
|
gst_rtp_base_depayload_push (depayload, outbuf);
|
|
|
|
/* only apply the timestamp to the first buffer of this packet */
|
|
timestamp = -1;
|
|
|
|
/* skip packet data */
|
|
payload += packet_len;
|
|
offset += packet_len;
|
|
payload_len -= packet_len;
|
|
} while (payload_len > 0);
|
|
|
|
gst_rtp_buffer_unmap (&rtpbuf);
|
|
|
|
return NULL;
|
|
|
|
/* ERRORS */
|
|
too_small:
|
|
{
|
|
gst_rtp_buffer_unmap (&rtpbuf);
|
|
GST_WARNING_OBJECT (depayload, "Payload too small, expected at least 4 "
|
|
"bytes for header, but got only %d bytes", payload_len);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
static GstStateChangeReturn
|
|
gst_rtp_asf_depay_change_state (GstElement * element, GstStateChange trans)
|
|
{
|
|
GstStateChangeReturn ret;
|
|
GstRtpAsfDepay *depay;
|
|
|
|
depay = GST_RTP_ASF_DEPAY (element);
|
|
|
|
switch (trans) {
|
|
case GST_STATE_CHANGE_READY_TO_PAUSED:
|
|
gst_adapter_clear (depay->adapter);
|
|
depay->discont = TRUE;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, trans);
|
|
|
|
switch (trans) {
|
|
case GST_STATE_CHANGE_PAUSED_TO_READY:
|
|
gst_adapter_clear (depay->adapter);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|