1 /* GStreamer
2 * Copyright (C) <2007> Thijs Vermeir <thijsvermeir@gmail.com>
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
13 *
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
17 * Boston, MA 02110-1301, USA.
18 */
19
20 #ifdef HAVE_CONFIG_H
21 #include "config.h"
22 #endif
23
24 #include <stdlib.h>
25 #include <string.h>
26 #include <gst/rtp/gstrtpbuffer.h>
27 #include <gst/video/video.h>
28
29 #include "gstrtpmpvpay.h"
30 #include "gstrtputils.h"
31
32 GST_DEBUG_CATEGORY_STATIC (rtpmpvpay_debug);
33 #define GST_CAT_DEFAULT (rtpmpvpay_debug)
34
35 static GstStaticPadTemplate gst_rtp_mpv_pay_sink_template =
36 GST_STATIC_PAD_TEMPLATE ("sink",
37 GST_PAD_SINK,
38 GST_PAD_ALWAYS,
39 GST_STATIC_CAPS ("video/mpeg, "
40 "mpegversion = (int) 2, systemstream = (boolean) FALSE")
41 );
42
43 static GstStaticPadTemplate gst_rtp_mpv_pay_src_template =
44 GST_STATIC_PAD_TEMPLATE ("src",
45 GST_PAD_SRC,
46 GST_PAD_ALWAYS,
47 GST_STATIC_CAPS ("application/x-rtp, "
48 "media = (string) \"video\", "
49 "payload = (int) " GST_RTP_PAYLOAD_MPV_STRING ", "
50 "clock-rate = (int) 90000, " "encoding-name = (string) \"MPV\"; "
51 "application/x-rtp, "
52 "media = (string) \"video\", "
53 "payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", "
54 "clock-rate = (int) 90000, " "encoding-name = (string) \"MPV\"")
55 );
56
57 static GstStateChangeReturn gst_rtp_mpv_pay_change_state (GstElement * element,
58 GstStateChange transition);
59
60 static void gst_rtp_mpv_pay_finalize (GObject * object);
61
62 static GstFlowReturn gst_rtp_mpv_pay_flush (GstRTPMPVPay * rtpmpvpay);
63 static gboolean gst_rtp_mpv_pay_setcaps (GstRTPBasePayload * payload,
64 GstCaps * caps);
65 static GstFlowReturn gst_rtp_mpv_pay_handle_buffer (GstRTPBasePayload *
66 payload, GstBuffer * buffer);
67 static gboolean gst_rtp_mpv_pay_sink_event (GstRTPBasePayload * payload,
68 GstEvent * event);
69
70 #define gst_rtp_mpv_pay_parent_class parent_class
71 G_DEFINE_TYPE (GstRTPMPVPay, gst_rtp_mpv_pay, GST_TYPE_RTP_BASE_PAYLOAD);
72
73 static void
gst_rtp_mpv_pay_class_init(GstRTPMPVPayClass * klass)74 gst_rtp_mpv_pay_class_init (GstRTPMPVPayClass * klass)
75 {
76 GObjectClass *gobject_class;
77 GstElementClass *gstelement_class;
78 GstRTPBasePayloadClass *gstrtpbasepayload_class;
79
80 gobject_class = (GObjectClass *) klass;
81 gstelement_class = (GstElementClass *) klass;
82 gstrtpbasepayload_class = (GstRTPBasePayloadClass *) klass;
83
84 gobject_class->finalize = gst_rtp_mpv_pay_finalize;
85
86 gstelement_class->change_state = gst_rtp_mpv_pay_change_state;
87
88 gst_element_class_add_static_pad_template (gstelement_class,
89 &gst_rtp_mpv_pay_sink_template);
90 gst_element_class_add_static_pad_template (gstelement_class,
91 &gst_rtp_mpv_pay_src_template);
92
93 gst_element_class_set_static_metadata (gstelement_class,
94 "RTP MPEG2 ES video payloader", "Codec/Payloader/Network/RTP",
95 "Payload-encodes MPEG2 ES into RTP packets (RFC 2250)",
96 "Thijs Vermeir <thijsvermeir@gmail.com>");
97
98 gstrtpbasepayload_class->set_caps = gst_rtp_mpv_pay_setcaps;
99 gstrtpbasepayload_class->handle_buffer = gst_rtp_mpv_pay_handle_buffer;
100 gstrtpbasepayload_class->sink_event = gst_rtp_mpv_pay_sink_event;
101
102 GST_DEBUG_CATEGORY_INIT (rtpmpvpay_debug, "rtpmpvpay", 0,
103 "MPEG2 ES Video RTP Payloader");
104 }
105
106 static void
gst_rtp_mpv_pay_init(GstRTPMPVPay * rtpmpvpay)107 gst_rtp_mpv_pay_init (GstRTPMPVPay * rtpmpvpay)
108 {
109 GST_RTP_BASE_PAYLOAD (rtpmpvpay)->clock_rate = 90000;
110 GST_RTP_BASE_PAYLOAD_PT (rtpmpvpay) = GST_RTP_PAYLOAD_MPV;
111
112 rtpmpvpay->adapter = gst_adapter_new ();
113 }
114
115 static void
gst_rtp_mpv_pay_finalize(GObject * object)116 gst_rtp_mpv_pay_finalize (GObject * object)
117 {
118 GstRTPMPVPay *rtpmpvpay;
119
120 rtpmpvpay = GST_RTP_MPV_PAY (object);
121
122 g_object_unref (rtpmpvpay->adapter);
123 rtpmpvpay->adapter = NULL;
124
125 G_OBJECT_CLASS (parent_class)->finalize (object);
126 }
127
128 static void
gst_rtp_mpv_pay_reset(GstRTPMPVPay * pay)129 gst_rtp_mpv_pay_reset (GstRTPMPVPay * pay)
130 {
131 pay->first_ts = -1;
132 pay->duration = 0;
133 gst_adapter_clear (pay->adapter);
134 GST_DEBUG_OBJECT (pay, "reset depayloader");
135 }
136
137 static gboolean
gst_rtp_mpv_pay_setcaps(GstRTPBasePayload * payload,GstCaps * caps)138 gst_rtp_mpv_pay_setcaps (GstRTPBasePayload * payload, GstCaps * caps)
139 {
140 gst_rtp_base_payload_set_options (payload, "video",
141 payload->pt != GST_RTP_PAYLOAD_MPV, "MPV", 90000);
142 return gst_rtp_base_payload_set_outcaps (payload, NULL);
143 }
144
145 static gboolean
gst_rtp_mpv_pay_sink_event(GstRTPBasePayload * payload,GstEvent * event)146 gst_rtp_mpv_pay_sink_event (GstRTPBasePayload * payload, GstEvent * event)
147 {
148 gboolean ret;
149 GstRTPMPVPay *rtpmpvpay;
150
151 rtpmpvpay = GST_RTP_MPV_PAY (payload);
152
153 switch (GST_EVENT_TYPE (event)) {
154 case GST_EVENT_EOS:
155 /* make sure we push the last packets in the adapter on EOS */
156 gst_rtp_mpv_pay_flush (rtpmpvpay);
157 break;
158 case GST_EVENT_FLUSH_STOP:
159 gst_rtp_mpv_pay_reset (rtpmpvpay);
160 break;
161 default:
162 break;
163 }
164
165 ret = GST_RTP_BASE_PAYLOAD_CLASS (parent_class)->sink_event (payload, event);
166
167 return ret;
168 }
169
170 #define RTP_HEADER_LEN 12
171
172 static GstFlowReturn
gst_rtp_mpv_pay_flush(GstRTPMPVPay * rtpmpvpay)173 gst_rtp_mpv_pay_flush (GstRTPMPVPay * rtpmpvpay)
174 {
175 GstFlowReturn ret;
176 guint avail;
177 GstBufferList *list;
178 GstBuffer *outbuf;
179
180 guint8 *payload;
181
182 avail = gst_adapter_available (rtpmpvpay->adapter);
183
184 ret = GST_FLOW_OK;
185
186 GST_DEBUG_OBJECT (rtpmpvpay, "available %u", avail);
187 if (avail == 0)
188 return GST_FLOW_OK;
189
190 list =
191 gst_buffer_list_new_sized (avail / (GST_RTP_BASE_PAYLOAD_MTU (rtpmpvpay) -
192 RTP_HEADER_LEN) + 1);
193
194 while (avail > 0) {
195 guint towrite;
196 guint packet_len;
197 guint payload_len;
198 GstRTPBuffer rtp = { NULL };
199 GstBuffer *paybuf;
200
201 packet_len = gst_rtp_buffer_calc_packet_len (avail + 4, 0, 0);
202
203 towrite = MIN (packet_len, GST_RTP_BASE_PAYLOAD_MTU (rtpmpvpay));
204
205 payload_len = gst_rtp_buffer_calc_payload_len (towrite, 0, 0);
206
207 outbuf = gst_rtp_buffer_new_allocate (4, 0, 0);
208
209 payload_len -= 4;
210
211 gst_rtp_buffer_map (outbuf, GST_MAP_WRITE, &rtp);
212
213 payload = gst_rtp_buffer_get_payload (&rtp);
214 /* enable MPEG Video-specific header
215 *
216 * 0 1 2 3
217 * 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
218 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
219 * | MBZ |T| TR | |N|S|B|E| P | | BFC | | FFC |
220 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
221 * AN FBV FFV
222 */
223
224 /* fill in the MPEG Video-specific header
225 * data is set to 0x0 here
226 */
227 memset (payload, 0x0, 4);
228
229 avail -= payload_len;
230
231 gst_rtp_buffer_set_marker (&rtp, avail == 0);
232 gst_rtp_buffer_unmap (&rtp);
233
234 paybuf = gst_adapter_take_buffer_fast (rtpmpvpay->adapter, payload_len);
235 gst_rtp_copy_video_meta (rtpmpvpay, outbuf, paybuf);
236 outbuf = gst_buffer_append (outbuf, paybuf);
237
238 GST_DEBUG_OBJECT (rtpmpvpay, "Adding buffer");
239
240 GST_BUFFER_PTS (outbuf) = rtpmpvpay->first_ts;
241 gst_buffer_list_add (list, outbuf);
242 }
243
244 ret = gst_rtp_base_payload_push_list (GST_RTP_BASE_PAYLOAD (rtpmpvpay), list);
245
246 return ret;
247 }
248
249 static GstFlowReturn
gst_rtp_mpv_pay_handle_buffer(GstRTPBasePayload * basepayload,GstBuffer * buffer)250 gst_rtp_mpv_pay_handle_buffer (GstRTPBasePayload * basepayload,
251 GstBuffer * buffer)
252 {
253 GstRTPMPVPay *rtpmpvpay;
254 guint avail, packet_len;
255 GstClockTime timestamp, duration;
256 GstFlowReturn ret = GST_FLOW_OK;
257
258 rtpmpvpay = GST_RTP_MPV_PAY (basepayload);
259
260 timestamp = GST_BUFFER_PTS (buffer);
261 duration = GST_BUFFER_DURATION (buffer);
262
263 if (GST_BUFFER_IS_DISCONT (buffer)) {
264 GST_DEBUG_OBJECT (rtpmpvpay, "DISCONT");
265 gst_rtp_mpv_pay_reset (rtpmpvpay);
266 }
267
268 avail = gst_adapter_available (rtpmpvpay->adapter);
269
270 if (duration == -1)
271 duration = 0;
272
273 if (rtpmpvpay->first_ts == GST_CLOCK_TIME_NONE || avail == 0)
274 rtpmpvpay->first_ts = timestamp;
275
276 if (avail == 0) {
277 rtpmpvpay->duration = duration;
278 } else {
279 rtpmpvpay->duration += duration;
280 }
281
282 gst_adapter_push (rtpmpvpay->adapter, buffer);
283 avail = gst_adapter_available (rtpmpvpay->adapter);
284
285 /* get packet length of previous data and this new data,
286 * payload length includes a 4 byte MPEG video-specific header */
287 packet_len = gst_rtp_buffer_calc_packet_len (avail, 4, 0);
288 GST_LOG_OBJECT (rtpmpvpay, "available %d, rtp packet length %d", avail,
289 packet_len);
290
291 if (gst_rtp_base_payload_is_filled (basepayload,
292 packet_len, rtpmpvpay->duration)) {
293 ret = gst_rtp_mpv_pay_flush (rtpmpvpay);
294 } else {
295 rtpmpvpay->first_ts = timestamp;
296 }
297
298 return ret;
299 }
300
301 static GstStateChangeReturn
gst_rtp_mpv_pay_change_state(GstElement * element,GstStateChange transition)302 gst_rtp_mpv_pay_change_state (GstElement * element, GstStateChange transition)
303 {
304 GstRTPMPVPay *rtpmpvpay;
305 GstStateChangeReturn ret;
306
307 rtpmpvpay = GST_RTP_MPV_PAY (element);
308
309 switch (transition) {
310 case GST_STATE_CHANGE_READY_TO_PAUSED:
311 gst_rtp_mpv_pay_reset (rtpmpvpay);
312 break;
313 default:
314 break;
315 }
316
317 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
318
319 switch (transition) {
320 case GST_STATE_CHANGE_PAUSED_TO_READY:
321 gst_rtp_mpv_pay_reset (rtpmpvpay);
322 break;
323 default:
324 break;
325 }
326 return ret;
327 }
328
329
330 gboolean
gst_rtp_mpv_pay_plugin_init(GstPlugin * plugin)331 gst_rtp_mpv_pay_plugin_init (GstPlugin * plugin)
332 {
333 return gst_element_register (plugin, "rtpmpvpay",
334 GST_RANK_SECONDARY, GST_TYPE_RTP_MPV_PAY);
335 }
336