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330 lines
9.3 KiB
C
330 lines
9.3 KiB
C
/* GStreamer
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* Copyright (C) <2007> Thijs Vermeir <thijsvermeir@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 <stdlib.h>
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#include <string.h>
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#include <gst/rtp/gstrtpbuffer.h>
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#include <gst/video/video.h>
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#include "gstrtpmpvpay.h"
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#include "gstrtputils.h"
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GST_DEBUG_CATEGORY_STATIC (rtpmpvpay_debug);
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#define GST_CAT_DEFAULT (rtpmpvpay_debug)
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static GstStaticPadTemplate gst_rtp_mpv_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/mpeg, "
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"mpegversion = (int) 2, systemstream = (boolean) FALSE")
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);
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static GstStaticPadTemplate gst_rtp_mpv_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_MPV_STRING ", "
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"clock-rate = (int) 90000, " "encoding-name = (string) \"MPV\"; "
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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) \"MPV\"")
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);
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static GstStateChangeReturn gst_rtp_mpv_pay_change_state (GstElement * element,
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GstStateChange transition);
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static void gst_rtp_mpv_pay_finalize (GObject * object);
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static GstFlowReturn gst_rtp_mpv_pay_flush (GstRTPMPVPay * rtpmpvpay);
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static gboolean gst_rtp_mpv_pay_setcaps (GstRTPBasePayload * payload,
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GstCaps * caps);
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static GstFlowReturn gst_rtp_mpv_pay_handle_buffer (GstRTPBasePayload *
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payload, GstBuffer * buffer);
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static gboolean gst_rtp_mpv_pay_sink_event (GstRTPBasePayload * payload,
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GstEvent * event);
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#define gst_rtp_mpv_pay_parent_class parent_class
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G_DEFINE_TYPE (GstRTPMPVPay, gst_rtp_mpv_pay, GST_TYPE_RTP_BASE_PAYLOAD);
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static void
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gst_rtp_mpv_pay_class_init (GstRTPMPVPayClass * klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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GstRTPBasePayloadClass *gstrtpbasepayload_class;
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gobject_class = (GObjectClass *) klass;
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gstelement_class = (GstElementClass *) klass;
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gstrtpbasepayload_class = (GstRTPBasePayloadClass *) klass;
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gobject_class->finalize = gst_rtp_mpv_pay_finalize;
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gstelement_class->change_state = gst_rtp_mpv_pay_change_state;
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gst_element_class_add_static_pad_template (gstelement_class,
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&gst_rtp_mpv_pay_sink_template);
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gst_element_class_add_static_pad_template (gstelement_class,
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&gst_rtp_mpv_pay_src_template);
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gst_element_class_set_static_metadata (gstelement_class,
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"RTP MPEG2 ES video payloader", "Codec/Payloader/Network/RTP",
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"Payload-encodes MPEG2 ES into RTP packets (RFC 2250)",
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"Thijs Vermeir <thijsvermeir@gmail.com>");
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gstrtpbasepayload_class->set_caps = gst_rtp_mpv_pay_setcaps;
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gstrtpbasepayload_class->handle_buffer = gst_rtp_mpv_pay_handle_buffer;
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gstrtpbasepayload_class->sink_event = gst_rtp_mpv_pay_sink_event;
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GST_DEBUG_CATEGORY_INIT (rtpmpvpay_debug, "rtpmpvpay", 0,
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"MPEG2 ES Video RTP Payloader");
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}
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static void
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gst_rtp_mpv_pay_init (GstRTPMPVPay * rtpmpvpay)
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{
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GST_RTP_BASE_PAYLOAD (rtpmpvpay)->clock_rate = 90000;
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GST_RTP_BASE_PAYLOAD_PT (rtpmpvpay) = GST_RTP_PAYLOAD_MPV;
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rtpmpvpay->adapter = gst_adapter_new ();
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}
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static void
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gst_rtp_mpv_pay_finalize (GObject * object)
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{
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GstRTPMPVPay *rtpmpvpay;
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rtpmpvpay = GST_RTP_MPV_PAY (object);
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g_object_unref (rtpmpvpay->adapter);
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rtpmpvpay->adapter = NULL;
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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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gst_rtp_mpv_pay_reset (GstRTPMPVPay * pay)
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{
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pay->first_ts = -1;
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pay->duration = 0;
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gst_adapter_clear (pay->adapter);
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GST_DEBUG_OBJECT (pay, "reset depayloader");
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}
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static gboolean
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gst_rtp_mpv_pay_setcaps (GstRTPBasePayload * payload, GstCaps * caps)
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{
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gst_rtp_base_payload_set_options (payload, "video",
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payload->pt != GST_RTP_PAYLOAD_MPV, "MPV", 90000);
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return gst_rtp_base_payload_set_outcaps (payload, NULL);
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}
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static gboolean
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gst_rtp_mpv_pay_sink_event (GstRTPBasePayload * payload, GstEvent * event)
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{
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gboolean ret;
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GstRTPMPVPay *rtpmpvpay;
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rtpmpvpay = GST_RTP_MPV_PAY (payload);
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switch (GST_EVENT_TYPE (event)) {
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case GST_EVENT_EOS:
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/* make sure we push the last packets in the adapter on EOS */
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gst_rtp_mpv_pay_flush (rtpmpvpay);
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break;
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case GST_EVENT_FLUSH_STOP:
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gst_rtp_mpv_pay_reset (rtpmpvpay);
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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_RTP_BASE_PAYLOAD_CLASS (parent_class)->sink_event (payload, event);
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return ret;
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}
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#define RTP_HEADER_LEN 12
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static GstFlowReturn
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gst_rtp_mpv_pay_flush (GstRTPMPVPay * rtpmpvpay)
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{
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GstFlowReturn ret;
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guint avail;
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GstBufferList *list;
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GstBuffer *outbuf;
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guint8 *payload;
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avail = gst_adapter_available (rtpmpvpay->adapter);
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ret = GST_FLOW_OK;
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list =
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gst_buffer_list_new_sized (avail / (GST_RTP_BASE_PAYLOAD_MTU (rtpmpvpay) -
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RTP_HEADER_LEN) + 1);
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while (avail > 0) {
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guint towrite;
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guint packet_len;
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guint payload_len;
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GstRTPBuffer rtp = { NULL };
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GstBuffer *paybuf;
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packet_len = gst_rtp_buffer_calc_packet_len (avail + 4, 0, 0);
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towrite = MIN (packet_len, GST_RTP_BASE_PAYLOAD_MTU (rtpmpvpay));
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payload_len = gst_rtp_buffer_calc_payload_len (towrite, 0, 0);
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outbuf = gst_rtp_buffer_new_allocate (4, 0, 0);
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payload_len -= 4;
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gst_rtp_buffer_map (outbuf, GST_MAP_WRITE, &rtp);
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payload = gst_rtp_buffer_get_payload (&rtp);
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/* enable MPEG Video-specific 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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* | MBZ |T| TR | |N|S|B|E| P | | BFC | | FFC |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* AN FBV FFV
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*/
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/* fill in the MPEG Video-specific header
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* data is set to 0x0 here
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*/
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memset (payload, 0x0, 4);
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avail -= payload_len;
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gst_rtp_buffer_set_marker (&rtp, avail == 0);
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gst_rtp_buffer_unmap (&rtp);
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paybuf = gst_adapter_take_buffer_fast (rtpmpvpay->adapter, payload_len);
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gst_rtp_copy_meta (GST_ELEMENT_CAST (rtpmpvpay), outbuf, paybuf,
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g_quark_from_static_string (GST_META_TAG_VIDEO_STR));
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outbuf = gst_buffer_append (outbuf, paybuf);
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GST_BUFFER_PTS (outbuf) = rtpmpvpay->first_ts;
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gst_buffer_list_add (list, outbuf);
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}
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ret = gst_rtp_base_payload_push_list (GST_RTP_BASE_PAYLOAD (rtpmpvpay), list);
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return ret;
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}
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static GstFlowReturn
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gst_rtp_mpv_pay_handle_buffer (GstRTPBasePayload * basepayload,
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GstBuffer * buffer)
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{
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GstRTPMPVPay *rtpmpvpay;
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guint avail, packet_len;
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GstClockTime timestamp, duration;
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GstFlowReturn ret = GST_FLOW_OK;
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rtpmpvpay = GST_RTP_MPV_PAY (basepayload);
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timestamp = GST_BUFFER_PTS (buffer);
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duration = GST_BUFFER_DURATION (buffer);
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if (GST_BUFFER_IS_DISCONT (buffer)) {
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GST_DEBUG_OBJECT (rtpmpvpay, "DISCONT");
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gst_rtp_mpv_pay_reset (rtpmpvpay);
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}
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avail = gst_adapter_available (rtpmpvpay->adapter);
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if (duration == -1)
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duration = 0;
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if (rtpmpvpay->first_ts == GST_CLOCK_TIME_NONE || avail == 0)
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rtpmpvpay->first_ts = timestamp;
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if (avail == 0) {
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rtpmpvpay->duration = duration;
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} else {
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rtpmpvpay->duration += duration;
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}
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gst_adapter_push (rtpmpvpay->adapter, buffer);
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avail = gst_adapter_available (rtpmpvpay->adapter);
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/* get packet length of previous data and this new data,
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* payload length includes a 4 byte MPEG video-specific header */
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packet_len = gst_rtp_buffer_calc_packet_len (avail, 4, 0);
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GST_LOG_OBJECT (rtpmpvpay, "available %d, rtp packet length %d", avail,
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packet_len);
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if (gst_rtp_base_payload_is_filled (basepayload,
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packet_len, rtpmpvpay->duration)) {
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ret = gst_rtp_mpv_pay_flush (rtpmpvpay);
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} else {
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rtpmpvpay->first_ts = timestamp;
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}
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return ret;
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}
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static GstStateChangeReturn
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gst_rtp_mpv_pay_change_state (GstElement * element, GstStateChange transition)
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{
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GstRTPMPVPay *rtpmpvpay;
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GstStateChangeReturn ret;
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rtpmpvpay = GST_RTP_MPV_PAY (element);
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switch (transition) {
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case GST_STATE_CHANGE_READY_TO_PAUSED:
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gst_rtp_mpv_pay_reset (rtpmpvpay);
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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_mpv_pay_reset (rtpmpvpay);
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break;
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default:
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break;
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}
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return ret;
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}
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gboolean
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gst_rtp_mpv_pay_plugin_init (GstPlugin * plugin)
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{
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return gst_element_register (plugin, "rtpmpvpay",
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GST_RANK_SECONDARY, GST_TYPE_RTP_MPV_PAY);
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}
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