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337 lines
10 KiB
C
337 lines
10 KiB
C
/* GStreamer
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* Copyright (C) <2005> 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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, 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 <gst/rtp/gstrtpbuffer.h>
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#include "gstrtph263ppay.h"
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#define DEFAULT_FRAGMENTATION_MODE GST_FRAGMENTATION_MODE_NORMAL
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enum
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{
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PROP_0,
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PROP_FRAGMENTATION_MODE
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};
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#define GST_TYPE_FRAGMENTATION_MODE (gst_fragmentation_mode_get_type())
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static GType
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gst_fragmentation_mode_get_type (void)
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{
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static GType fragmentation_mode_type = 0;
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static const GEnumValue fragmentation_mode[] = {
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{GST_FRAGMENTATION_MODE_NORMAL, "Normal", "normal"},
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{GST_FRAGMENTATION_MODE_SYNC, "Fragment at sync points", "sync"},
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{0, NULL, NULL},
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};
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if (!fragmentation_mode_type) {
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fragmentation_mode_type =
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g_enum_register_static ("GstFragmentationMode", fragmentation_mode);
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}
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return fragmentation_mode_type;
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}
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GST_DEBUG_CATEGORY_STATIC (rtph263ppay_debug);
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#define GST_CAT_DEFAULT rtph263ppay_debug
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static GstStaticPadTemplate gst_rtp_h263p_pay_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 ("video/x-h263, " "variant = (string) \"itu\" ")
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);
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static GstStaticPadTemplate gst_rtp_h263p_pay_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 ("application/x-rtp, "
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"media = (string) \"video\", "
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"payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", "
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"clock-rate = (int) 90000, " "encoding-name = (string) \"H263-1998\"; "
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"application/x-rtp, "
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"media = (string) \"video\", "
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"payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", "
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"clock-rate = (int) 90000, " "encoding-name = (string) \"H263-2000\"")
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);
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static void gst_rtp_h263p_pay_finalize (GObject * object);
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static void gst_rtp_h263p_pay_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_rtp_h263p_pay_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static gboolean gst_rtp_h263p_pay_setcaps (GstBaseRTPPayload * payload,
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GstCaps * caps);
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static GstFlowReturn gst_rtp_h263p_pay_handle_buffer (GstBaseRTPPayload *
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payload, GstBuffer * buffer);
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GST_BOILERPLATE (GstRtpH263PPay, gst_rtp_h263p_pay, GstBaseRTPPayload,
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GST_TYPE_BASE_RTP_PAYLOAD);
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static void
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gst_rtp_h263p_pay_base_init (gpointer klass)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&gst_rtp_h263p_pay_src_template));
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&gst_rtp_h263p_pay_sink_template));
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gst_element_class_set_details_simple (element_class, "RTP H263 payloader",
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"Codec/Payloader/Network/RTP",
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"Payload-encodes H263/+/++ video in RTP packets (RFC 4629)",
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"Wim Taymans <wim.taymans@gmail.com>");
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}
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static void
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gst_rtp_h263p_pay_class_init (GstRtpH263PPayClass * klass)
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{
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GObjectClass *gobject_class;
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GstBaseRTPPayloadClass *gstbasertppayload_class;
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gobject_class = (GObjectClass *) klass;
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gstbasertppayload_class = (GstBaseRTPPayloadClass *) klass;
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gobject_class->finalize = gst_rtp_h263p_pay_finalize;
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gobject_class->set_property = gst_rtp_h263p_pay_set_property;
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gobject_class->get_property = gst_rtp_h263p_pay_get_property;
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gstbasertppayload_class->set_caps = gst_rtp_h263p_pay_setcaps;
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gstbasertppayload_class->handle_buffer = gst_rtp_h263p_pay_handle_buffer;
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g_object_class_install_property (G_OBJECT_CLASS (klass),
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PROP_FRAGMENTATION_MODE, g_param_spec_enum ("fragmentation-mode",
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"Fragmentation Mode",
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"Packet Fragmentation Mode", GST_TYPE_FRAGMENTATION_MODE,
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DEFAULT_FRAGMENTATION_MODE,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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GST_DEBUG_CATEGORY_INIT (rtph263ppay_debug, "rtph263ppay",
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0, "rtph263ppay (RFC 4629)");
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}
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static void
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gst_rtp_h263p_pay_init (GstRtpH263PPay * rtph263ppay,
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GstRtpH263PPayClass * klass)
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{
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rtph263ppay->adapter = gst_adapter_new ();
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rtph263ppay->fragmentation_mode = DEFAULT_FRAGMENTATION_MODE;
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}
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static void
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gst_rtp_h263p_pay_finalize (GObject * object)
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{
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GstRtpH263PPay *rtph263ppay;
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rtph263ppay = GST_RTP_H263P_PAY (object);
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g_object_unref (rtph263ppay->adapter);
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rtph263ppay->adapter = NULL;
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static gboolean
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gst_rtp_h263p_pay_setcaps (GstBaseRTPPayload * payload, GstCaps * caps)
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{
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gboolean res;
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gst_basertppayload_set_options (payload, "video", TRUE, "H263-1998", 90000);
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res = gst_basertppayload_set_outcaps (payload, NULL);
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return res;
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}
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static void
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gst_rtp_h263p_pay_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstRtpH263PPay *rtph263ppay;
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rtph263ppay = GST_RTP_H263P_PAY (object);
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switch (prop_id) {
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case PROP_FRAGMENTATION_MODE:
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rtph263ppay->fragmentation_mode = g_value_get_enum (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_rtp_h263p_pay_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstRtpH263PPay *rtph263ppay;
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rtph263ppay = GST_RTP_H263P_PAY (object);
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switch (prop_id) {
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case PROP_FRAGMENTATION_MODE:
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g_value_set_enum (value, rtph263ppay->fragmentation_mode);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static GstFlowReturn
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gst_rtp_h263p_pay_flush (GstRtpH263PPay * rtph263ppay)
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{
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guint avail;
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GstBuffer *outbuf;
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GstFlowReturn ret;
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gboolean fragmented;
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avail = gst_adapter_available (rtph263ppay->adapter);
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if (avail == 0)
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return GST_FLOW_OK;
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fragmented = FALSE;
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/* This algorithm assumes the H263/+/++ encoder sends complete frames in each
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* buffer */
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/* With Fragmentation Mode at GST_FRAGMENTATION_MODE_NORMAL:
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* This algorithm implements the Follow-on packets method for packetization.
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* This assumes low packet loss network.
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* With Fragmentation Mode at GST_FRAGMENTATION_MODE_SYNC:
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* This algorithm separates large frames at synchronisation points (Segments)
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* (See RFC 4629 section 6). It would be interesting to have a property such as network
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* quality to select between both packetization methods */
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/* TODO Add VRC supprt (See RFC 4629 section 5.2) */
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while (avail > 0) {
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guint towrite;
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guint8 *payload;
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guint payload_len;
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gint header_len;
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guint next_gop = 0;
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gboolean found_gob = FALSE;
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if (rtph263ppay->fragmentation_mode == GST_FRAGMENTATION_MODE_SYNC) {
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/* start after 1st gop possible */
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guint parsed_len = 3;
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const guint8 *parse_data = NULL;
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parse_data = gst_adapter_peek (rtph263ppay->adapter, avail);
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/* Check if we have a gob or eos , eossbs */
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/* FIXME EOS and EOSSBS packets should never contain any gobs and vice-versa */
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if (avail >= 3 && *parse_data == 0 && *(parse_data + 1) == 0
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&& *(parse_data + 2) >= 0x80) {
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GST_DEBUG_OBJECT (rtph263ppay, " Found GOB header");
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found_gob = TRUE;
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}
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/* Find next and cut the packet accordingly */
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/* TODO we should get as many gobs as possible until MTU is reached, this
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* code seems to just get one GOB per packet */
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while (parsed_len + 2 < avail) {
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if (parse_data[parsed_len] == 0 && parse_data[parsed_len + 1] == 0
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&& parse_data[parsed_len + 2] >= 0x80) {
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next_gop = parsed_len;
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GST_DEBUG_OBJECT (rtph263ppay, " Next GOB Detected at : %d",
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next_gop);
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break;
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}
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parsed_len++;
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}
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}
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/* for picture start frames (non-fragmented), we need to remove the first
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* two 0x00 bytes and set P=1 */
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header_len = (fragmented && !found_gob) ? 2 : 0;
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towrite = MIN (avail, gst_rtp_buffer_calc_payload_len
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(GST_BASE_RTP_PAYLOAD_MTU (rtph263ppay) - header_len, 0, 0));
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if (next_gop > 0)
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towrite = MIN (next_gop, towrite);
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payload_len = header_len + towrite;
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outbuf = gst_rtp_buffer_new_allocate (payload_len, 0, 0);
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/* last fragment gets the marker bit set */
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gst_rtp_buffer_set_marker (outbuf, avail > towrite ? 0 : 1);
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payload = gst_rtp_buffer_get_payload (outbuf);
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gst_adapter_copy (rtph263ppay->adapter, &payload[header_len], 0, towrite);
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/* 0 1
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | RR |P|V| PLEN |PEBIT|
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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/* if fragmented or gop header , write p bit =1 */
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payload[0] = (fragmented && !found_gob) ? 0x00 : 0x04;
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payload[1] = 0;
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GST_BUFFER_TIMESTAMP (outbuf) = rtph263ppay->first_timestamp;
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GST_BUFFER_DURATION (outbuf) = rtph263ppay->first_duration;
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gst_adapter_flush (rtph263ppay->adapter, towrite);
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ret = gst_basertppayload_push (GST_BASE_RTP_PAYLOAD (rtph263ppay), outbuf);
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avail -= towrite;
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fragmented = TRUE;
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}
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return ret;
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}
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static GstFlowReturn
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gst_rtp_h263p_pay_handle_buffer (GstBaseRTPPayload * payload,
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GstBuffer * buffer)
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{
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GstRtpH263PPay *rtph263ppay;
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GstFlowReturn ret;
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rtph263ppay = GST_RTP_H263P_PAY (payload);
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rtph263ppay->first_timestamp = GST_BUFFER_TIMESTAMP (buffer);
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rtph263ppay->first_duration = GST_BUFFER_DURATION (buffer);
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/* we always encode and flush a full picture */
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gst_adapter_push (rtph263ppay->adapter, buffer);
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ret = gst_rtp_h263p_pay_flush (rtph263ppay);
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return ret;
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}
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gboolean
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gst_rtp_h263p_pay_plugin_init (GstPlugin * plugin)
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{
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return gst_element_register (plugin, "rtph263ppay",
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GST_RANK_SECONDARY, GST_TYPE_RTP_H263P_PAY);
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}
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