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228 lines
7 KiB
C
228 lines
7 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., 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 "gstrtpgstpay.h"
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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|X|Y|Z| 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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* X: media 1 flag
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* Y: media 2 flag
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* Z: media 3 flag
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*
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*
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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 gboolean gst_rtp_gst_pay_setcaps (GstBaseRTPPayload * payload,
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GstCaps * caps);
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static GstFlowReturn gst_rtp_gst_pay_handle_buffer (GstBaseRTPPayload * payload,
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GstBuffer * buffer);
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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_BASE_RTP_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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GstElementClass *gstelement_class;
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GstBaseRTPPayloadClass *gstbasertppayload_class;
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gstelement_class = (GstElementClass *) klass;
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gstbasertppayload_class = (GstBaseRTPPayloadClass *) klass;
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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_details_simple (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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gstbasertppayload_class->set_caps = gst_rtp_gst_pay_setcaps;
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gstbasertppayload_class->handle_buffer = gst_rtp_gst_pay_handle_buffer;
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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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}
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static gboolean
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gst_rtp_gst_pay_setcaps (GstBaseRTPPayload * payload, GstCaps * caps)
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{
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gboolean res;
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gchar *capsstr, *capsenc;
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capsstr = gst_caps_to_string (caps);
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capsenc = g_base64_encode ((guchar *) capsstr, strlen (capsstr));
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g_free (capsstr);
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gst_basertppayload_set_options (payload, "application", TRUE, "X-GST", 90000);
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res =
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gst_basertppayload_set_outcaps (payload, "caps", G_TYPE_STRING, capsenc,
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NULL);
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g_free (capsenc);
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return res;
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}
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static GstFlowReturn
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gst_rtp_gst_pay_handle_buffer (GstBaseRTPPayload * basepayload,
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GstBuffer * buffer)
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{
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GstRtpGSTPay *rtpgstpay;
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guint8 *data, *ptr;
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gsize size, left;
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GstBuffer *outbuf;
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GstFlowReturn ret;
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GstClockTime timestamp;
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guint32 frag_offset;
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guint flags;
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rtpgstpay = GST_RTP_GST_PAY (basepayload);
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data = gst_buffer_map (buffer, &size, NULL, GST_MAP_READ);
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timestamp = GST_BUFFER_TIMESTAMP (buffer);
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ret = GST_FLOW_OK;
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/* caps always from SDP for now */
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flags = 0;
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if (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT))
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flags |= (1 << 3);
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if (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_MEDIA1))
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flags |= (1 << 2);
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if (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_MEDIA2))
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flags |= (1 << 1);
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if (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_MEDIA3))
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flags |= (1 << 0);
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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|X|Y|Z| MBZ |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Frag_offset |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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frag_offset = 0;
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ptr = data;
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left = size;
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while (left > 0) {
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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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GstRTPBuffer rtp = { NULL };
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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 + left, 0, 0);
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/* fill one MTU or all available bytes */
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towrite = MIN (packet_len, GST_BASE_RTP_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 payload */
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outbuf = gst_rtp_buffer_new_allocate (payload_len, 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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payload[0] = flags;
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payload[1] = 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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memcpy (payload, ptr, payload_len);
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ptr += payload_len;
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left -= payload_len;
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frag_offset += payload_len;
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if (left == 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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GST_BUFFER_TIMESTAMP (outbuf) = timestamp;
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ret = gst_basertppayload_push (basepayload, outbuf);
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}
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gst_buffer_unmap (buffer, data, size);
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gst_buffer_unref (buffer);
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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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