mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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383 lines
11 KiB
C
383 lines
11 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 <gst/rtp/gstrtpbuffer.h>
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#include "gstrtpgstpay.h"
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GST_DEBUG_CATEGORY_STATIC (gst_rtp_pay_debug);
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#define GST_CAT_DEFAULT gst_rtp_pay_debug
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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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* C: caps inlined flag
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* When C set, first part of payload contains caps definition. Caps definition
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* starts with variable-length length prefix and then a string of that length.
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* the length is encoded in big endian 7 bit chunks, the top 1 bit of a byte
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* is the continuation marker and the 7 next bits the data. A continuation
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* marker of 1 means that the next byte contains more data.
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*
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* CV: caps version, 0 = caps from SDP, 1 - 7 inlined caps
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* D: delta unit buffer
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* ETYPE: type of event. Payload contains the event, prefixed with a
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* variable length field.
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* 0 = NO event
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* 1 = GST_EVENT_TAG
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* 2 = GST_EVENT_CUSTOM_DOWNSTREAM
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* 3 = GST_EVENT_CUSTOM_BOTH
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*/
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static GstStaticPadTemplate gst_rtp_gst_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_ANY);
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static GstStaticPadTemplate gst_rtp_gst_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) \"application\", "
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"payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", "
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"clock-rate = (int) 90000, " "encoding-name = (string) \"X-GST\"")
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);
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static void gst_rtp_gst_pay_finalize (GObject * obj);
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static gboolean gst_rtp_gst_pay_setcaps (GstRTPBasePayload * payload,
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GstCaps * caps);
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static GstFlowReturn gst_rtp_gst_pay_handle_buffer (GstRTPBasePayload * payload,
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GstBuffer * buffer);
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static gboolean gst_rtp_gst_pay_sink_event (GstRTPBasePayload * payload,
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GstEvent * event);
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#define gst_rtp_gst_pay_parent_class parent_class
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G_DEFINE_TYPE (GstRtpGSTPay, gst_rtp_gst_pay, GST_TYPE_RTP_BASE_PAYLOAD);
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static void
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gst_rtp_gst_pay_class_init (GstRtpGSTPayClass * 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_gst_pay_finalize;
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gst_element_class_add_pad_template (gstelement_class,
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gst_static_pad_template_get (&gst_rtp_gst_pay_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_pay_sink_template));
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gst_element_class_set_static_metadata (gstelement_class,
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"RTP GStreamer payloader", "Codec/Payloader/Network/RTP",
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"Payload GStreamer buffers as RTP packets",
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"Wim Taymans <wim.taymans@gmail.com>");
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gstrtpbasepayload_class->set_caps = gst_rtp_gst_pay_setcaps;
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gstrtpbasepayload_class->handle_buffer = gst_rtp_gst_pay_handle_buffer;
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gstrtpbasepayload_class->sink_event = gst_rtp_gst_pay_sink_event;
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GST_DEBUG_CATEGORY_INIT (gst_rtp_pay_debug, "rtpgstpay", 0,
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"rtpgstpay element");
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}
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static void
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gst_rtp_gst_pay_init (GstRtpGSTPay * rtpgstpay)
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{
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rtpgstpay->adapter = gst_adapter_new ();
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gst_rtp_base_payload_set_options (GST_RTP_BASE_PAYLOAD (rtpgstpay),
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"application", TRUE, "X-GST", 90000);
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}
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static void
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gst_rtp_gst_pay_finalize (GObject * obj)
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{
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GstRtpGSTPay *rtpgstpay;
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rtpgstpay = GST_RTP_GST_PAY (obj);
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g_object_unref (rtpgstpay->adapter);
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G_OBJECT_CLASS (parent_class)->finalize (obj);
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}
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static GstFlowReturn
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gst_rtp_gst_pay_flush (GstRtpGSTPay * rtpgstpay, GstClockTime timestamp)
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{
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GstFlowReturn ret;
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guint avail;
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guint frag_offset;
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GstBufferList *list;
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frag_offset = 0;
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avail = gst_adapter_available (rtpgstpay->adapter);
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if (avail == 0)
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return GST_FLOW_OK;
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list = gst_buffer_list_new ();
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while (avail) {
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guint towrite;
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guint8 *payload;
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guint payload_len;
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guint packet_len;
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GstBuffer *outbuf;
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GstRTPBuffer rtp = { NULL };
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GstBuffer *paybuf;
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/* this will be the total lenght of the packet */
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packet_len = gst_rtp_buffer_calc_packet_len (8 + avail, 0, 0);
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/* fill one MTU or all available bytes */
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towrite = MIN (packet_len, GST_RTP_BASE_PAYLOAD_MTU (rtpgstpay));
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/* this is the payload length */
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payload_len = gst_rtp_buffer_calc_payload_len (towrite, 0, 0);
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/* create buffer to hold the header */
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outbuf = gst_rtp_buffer_new_allocate (8, 0, 0);
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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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GST_DEBUG_OBJECT (rtpgstpay, "new packet len %u, frag %u", packet_len,
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frag_offset);
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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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payload[0] = rtpgstpay->flags;
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payload[1] = rtpgstpay->etype;
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payload[2] = payload[3] = 0;
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payload[4] = frag_offset >> 24;
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payload[5] = frag_offset >> 16;
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payload[6] = frag_offset >> 8;
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payload[7] = frag_offset & 0xff;
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payload += 8;
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payload_len -= 8;
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frag_offset += payload_len;
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avail -= payload_len;
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if (avail == 0)
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gst_rtp_buffer_set_marker (&rtp, TRUE);
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gst_rtp_buffer_unmap (&rtp);
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/* create a new buf to hold the payload */
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GST_DEBUG_OBJECT (rtpgstpay, "take %u bytes from adapter", payload_len);
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paybuf = gst_adapter_take_buffer (rtpgstpay->adapter, payload_len);
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/* create a new group to hold the rtp header and the payload */
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gst_buffer_append (outbuf, paybuf);
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GST_BUFFER_TIMESTAMP (outbuf) = timestamp;
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/* and add to list */
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gst_buffer_list_insert (list, -1, outbuf);
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}
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/* push the whole buffer list at once */
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ret = gst_rtp_base_payload_push_list (GST_RTP_BASE_PAYLOAD (rtpgstpay), list);
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rtpgstpay->flags &= 0x70;
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rtpgstpay->etype = 0;
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return ret;
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}
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static GstBuffer *
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make_data_buffer (GstRtpGSTPay * rtpgstpay, gchar * data, guint size)
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{
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guint plen;
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guint8 *ptr;
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GstBuffer *outbuf;
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GstMapInfo map;
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/* calculate length */
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plen = 1;
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while (size >> (7 * plen))
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plen++;
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outbuf = gst_buffer_new_allocate (NULL, plen + size, NULL);
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gst_buffer_map (outbuf, &map, GST_MAP_WRITE);
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ptr = map.data;
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/* write length */
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while (plen) {
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plen--;
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*ptr++ = ((plen > 0) ? 0x80 : 0) | ((size >> (7 * plen)) & 0x7f);
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}
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/* copy data */
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memcpy (ptr, data, size);
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gst_buffer_unmap (outbuf, &map);
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return outbuf;
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}
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static gboolean
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gst_rtp_gst_pay_setcaps (GstRTPBasePayload * payload, GstCaps * caps)
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{
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GstRtpGSTPay *rtpgstpay;
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gboolean res;
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gchar *capsstr, *capsenc, *capsver;
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guint capslen;
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GstBuffer *outbuf;
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rtpgstpay = GST_RTP_GST_PAY (payload);
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capsstr = gst_caps_to_string (caps);
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capslen = strlen (capsstr);
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rtpgstpay->current_CV = rtpgstpay->next_CV;
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/* encode without 0 byte */
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capsenc = g_base64_encode ((guchar *) capsstr, capslen);
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GST_DEBUG_OBJECT (payload, "caps=%s, caps(base64)=%s", capsstr, capsenc);
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/* for 0 byte */
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capslen++;
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/* make a data buffer of it */
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outbuf = make_data_buffer (rtpgstpay, capsstr, capslen);
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g_free (capsstr);
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/* store in adapter, we don't flush yet, buffer might follow */
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rtpgstpay->flags = (1 << 7) | (rtpgstpay->current_CV << 4);
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rtpgstpay->next_CV = (rtpgstpay->next_CV + 1) & 0x7;
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gst_adapter_push (rtpgstpay->adapter, outbuf);
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/* make caps for SDP */
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capsver = g_strdup_printf ("%d", rtpgstpay->current_CV);
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res =
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gst_rtp_base_payload_set_outcaps (payload, "caps", G_TYPE_STRING, capsenc,
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"capsversion", G_TYPE_STRING, capsver, NULL);
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g_free (capsenc);
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g_free (capsver);
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return res;
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}
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static gboolean
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gst_rtp_gst_pay_sink_event (GstRTPBasePayload * payload, GstEvent * event)
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{
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gboolean ret;
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GstRtpGSTPay *rtpgstpay;
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guint etype;
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rtpgstpay = GST_RTP_GST_PAY (payload);
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ret = GST_RTP_BASE_PAYLOAD_CLASS (parent_class)->sink_event (payload, event);
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switch (GST_EVENT_TYPE (event)) {
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case GST_EVENT_TAG:
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etype = 1;
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break;
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case GST_EVENT_CUSTOM_DOWNSTREAM:
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etype = 2;
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break;
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case GST_EVENT_CUSTOM_BOTH:
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etype = 2;
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break;
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default:
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etype = 0;
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GST_LOG_OBJECT (rtpgstpay, "no event for %s",
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GST_EVENT_TYPE_NAME (event));
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break;
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}
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if (etype) {
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const GstStructure *s;
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gchar *estr;
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guint elen;
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GstBuffer *outbuf;
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/* make sure the adapter is flushed */
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gst_rtp_gst_pay_flush (rtpgstpay, GST_CLOCK_TIME_NONE);
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GST_DEBUG_OBJECT (rtpgstpay, "make event type %d for %s",
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etype, GST_EVENT_TYPE_NAME (event));
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s = gst_event_get_structure (event);
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estr = gst_structure_to_string (s);
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elen = strlen (estr);
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outbuf = make_data_buffer (rtpgstpay, estr, elen);
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g_free (estr);
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rtpgstpay->etype = etype;
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gst_adapter_push (rtpgstpay->adapter, outbuf);
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/* flush the adapter immediately */
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gst_rtp_gst_pay_flush (rtpgstpay, GST_CLOCK_TIME_NONE);
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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_gst_pay_handle_buffer (GstRTPBasePayload * basepayload,
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GstBuffer * buffer)
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{
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GstFlowReturn ret;
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GstRtpGSTPay *rtpgstpay;
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GstClockTime timestamp;
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rtpgstpay = GST_RTP_GST_PAY (basepayload);
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timestamp = GST_BUFFER_TIMESTAMP (buffer);
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/* caps always from SDP for now */
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if (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT))
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rtpgstpay->flags |= (1 << 3);
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gst_adapter_push (rtpgstpay->adapter, buffer);
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ret = gst_rtp_gst_pay_flush (rtpgstpay, timestamp);
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return ret;
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}
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gboolean
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gst_rtp_gst_pay_plugin_init (GstPlugin * plugin)
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{
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return gst_element_register (plugin, "rtpgstpay",
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GST_RANK_NONE, GST_TYPE_RTP_GST_PAY);
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}
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