2 * Copyright (C) <2010> Wim Taymans <wim.taymans@gmail.com>
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.
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.
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., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
26 #include <gst/rtp/gstrtpbuffer.h>
28 #include "gstrtpac3pay.h"
30 GST_DEBUG_CATEGORY_STATIC (rtpac3pay_debug);
31 #define GST_CAT_DEFAULT (rtpac3pay_debug)
33 static GstStaticPadTemplate gst_rtp_ac3_pay_sink_template =
34 GST_STATIC_PAD_TEMPLATE ("sink",
37 GST_STATIC_CAPS ("audio/ac3; " "audio/x-ac3; ")
40 static GstStaticPadTemplate gst_rtp_ac3_pay_src_template =
41 GST_STATIC_PAD_TEMPLATE ("src",
44 GST_STATIC_CAPS ("application/x-rtp, "
45 "media = (string) \"audio\", "
46 "payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", "
47 "clock-rate = (int) { 32000, 44100, 48000 }, "
48 "encoding-name = (string) \"AC3\"")
51 static void gst_rtp_ac3_pay_finalize (GObject * object);
53 static GstStateChangeReturn gst_rtp_ac3_pay_change_state (GstElement * element,
54 GstStateChange transition);
56 static gboolean gst_rtp_ac3_pay_setcaps (GstBaseRTPPayload * payload,
58 static gboolean gst_rtp_ac3_pay_handle_event (GstPad * pad, GstEvent * event);
59 static GstFlowReturn gst_rtp_ac3_pay_flush (GstRtpAC3Pay * rtpac3pay);
60 static GstFlowReturn gst_rtp_ac3_pay_handle_buffer (GstBaseRTPPayload * payload,
63 GST_BOILERPLATE (GstRtpAC3Pay, gst_rtp_ac3_pay, GstBaseRTPPayload,
64 GST_TYPE_BASE_RTP_PAYLOAD)
66 static void gst_rtp_ac3_pay_base_init (gpointer klass)
68 GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
70 gst_element_class_add_static_pad_template (element_class,
71 &gst_rtp_ac3_pay_src_template);
72 gst_element_class_add_static_pad_template (element_class,
73 &gst_rtp_ac3_pay_sink_template);
75 gst_element_class_set_details_simple (element_class,
76 "RTP AC3 audio payloader", "Codec/Payloader/Network/RTP",
77 "Payload AC3 audio as RTP packets (RFC 4184)",
78 "Wim Taymans <wim.taymans@gmail.com>");
82 gst_rtp_ac3_pay_class_init (GstRtpAC3PayClass * klass)
84 GObjectClass *gobject_class;
85 GstElementClass *gstelement_class;
86 GstBaseRTPPayloadClass *gstbasertppayload_class;
88 gobject_class = (GObjectClass *) klass;
89 gstelement_class = (GstElementClass *) klass;
90 gstbasertppayload_class = (GstBaseRTPPayloadClass *) klass;
92 gobject_class->finalize = gst_rtp_ac3_pay_finalize;
94 gstelement_class->change_state = gst_rtp_ac3_pay_change_state;
96 gstbasertppayload_class->set_caps = gst_rtp_ac3_pay_setcaps;
97 gstbasertppayload_class->handle_event = gst_rtp_ac3_pay_handle_event;
98 gstbasertppayload_class->handle_buffer = gst_rtp_ac3_pay_handle_buffer;
100 GST_DEBUG_CATEGORY_INIT (rtpac3pay_debug, "rtpac3pay", 0,
101 "AC3 Audio RTP Depayloader");
105 gst_rtp_ac3_pay_init (GstRtpAC3Pay * rtpac3pay, GstRtpAC3PayClass * klass)
107 rtpac3pay->adapter = gst_adapter_new ();
111 gst_rtp_ac3_pay_finalize (GObject * object)
113 GstRtpAC3Pay *rtpac3pay;
115 rtpac3pay = GST_RTP_AC3_PAY (object);
117 g_object_unref (rtpac3pay->adapter);
119 G_OBJECT_CLASS (parent_class)->finalize (object);
123 gst_rtp_ac3_pay_reset (GstRtpAC3Pay * pay)
127 gst_adapter_clear (pay->adapter);
128 GST_DEBUG_OBJECT (pay, "reset depayloader");
132 gst_rtp_ac3_pay_setcaps (GstBaseRTPPayload * payload, GstCaps * caps)
136 GstStructure *structure;
138 structure = gst_caps_get_structure (caps, 0);
140 if (!gst_structure_get_int (structure, "rate", &rate))
141 rate = 90000; /* default */
143 gst_basertppayload_set_options (payload, "audio", TRUE, "AC3", rate);
144 res = gst_basertppayload_set_outcaps (payload, NULL);
150 gst_rtp_ac3_pay_handle_event (GstPad * pad, GstEvent * event)
152 GstRtpAC3Pay *rtpac3pay;
154 rtpac3pay = GST_RTP_AC3_PAY (gst_pad_get_parent (pad));
156 switch (GST_EVENT_TYPE (event)) {
158 /* make sure we push the last packets in the adapter on EOS */
159 gst_rtp_ac3_pay_flush (rtpac3pay);
161 case GST_EVENT_FLUSH_STOP:
162 gst_rtp_ac3_pay_reset (rtpac3pay);
168 gst_object_unref (rtpac3pay);
170 /* FALSE to let the parent handle the event as well */
180 static const struct frmsize_s frmsizecod_tbl[] = {
185 {48, {96, 104, 144}},
186 {48, {96, 105, 144}},
187 {56, {112, 121, 168}},
188 {56, {112, 122, 168}},
189 {64, {128, 139, 192}},
190 {64, {128, 140, 192}},
191 {80, {160, 174, 240}},
192 {80, {160, 175, 240}},
193 {96, {192, 208, 288}},
194 {96, {192, 209, 288}},
195 {112, {224, 243, 336}},
196 {112, {224, 244, 336}},
197 {128, {256, 278, 384}},
198 {128, {256, 279, 384}},
199 {160, {320, 348, 480}},
200 {160, {320, 349, 480}},
201 {192, {384, 417, 576}},
202 {192, {384, 418, 576}},
203 {224, {448, 487, 672}},
204 {224, {448, 488, 672}},
205 {256, {512, 557, 768}},
206 {256, {512, 558, 768}},
207 {320, {640, 696, 960}},
208 {320, {640, 697, 960}},
209 {384, {768, 835, 1152}},
210 {384, {768, 836, 1152}},
211 {448, {896, 975, 1344}},
212 {448, {896, 976, 1344}},
213 {512, {1024, 1114, 1536}},
214 {512, {1024, 1115, 1536}},
215 {576, {1152, 1253, 1728}},
216 {576, {1152, 1254, 1728}},
217 {640, {1280, 1393, 1920}},
218 {640, {1280, 1394, 1920}}
222 gst_rtp_ac3_pay_flush (GstRtpAC3Pay * rtpac3pay)
224 guint avail, FT, NF, mtu;
228 /* the data available in the adapter is either smaller
229 * than the MTU or bigger. In the case it is smaller, the complete
230 * adapter contents can be put in one packet. In the case the
231 * adapter has more than one MTU, we need to split the AC3 data
232 * over multiple packets. */
233 avail = gst_adapter_available (rtpac3pay->adapter);
238 /* number of frames */
241 mtu = GST_BASE_RTP_PAYLOAD_MTU (rtpac3pay);
243 GST_LOG_OBJECT (rtpac3pay, "flushing %u bytes", avail);
251 /* this will be the total length of the packet */
252 packet_len = gst_rtp_buffer_calc_packet_len (2 + avail, 0, 0);
254 /* fill one MTU or all available bytes */
255 towrite = MIN (packet_len, mtu);
257 /* this is the payload length */
258 payload_len = gst_rtp_buffer_calc_payload_len (towrite, 0, 0);
260 /* create buffer to hold the payload */
261 outbuf = gst_rtp_buffer_new_allocate (payload_len, 0, 0);
264 /* check if it all fits */
265 if (towrite < packet_len) {
268 GST_LOG_OBJECT (rtpac3pay, "we need to fragment");
269 /* check if we will be able to put at least 5/8th of the total
270 * frame in this first frame. */
271 if ((avail * 5) / 8 >= (payload_len - 2))
275 /* check how many fragments we will need */
276 maxlen = gst_rtp_buffer_calc_payload_len (mtu - 2, 0, 0);
277 NF = (avail + maxlen - 1) / maxlen;
279 } else if (FT != 3) {
280 /* remaining fragment */
286 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
287 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
289 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
291 * FT: 0: one or more complete frames
292 * 1: initial 5/8 fragment
293 * 2: initial fragment not 5/8
295 * NF: amount of frames if FT = 0, else number of fragments.
297 GST_LOG_OBJECT (rtpac3pay, "FT %u, NF %u", FT, NF);
298 payload = gst_rtp_buffer_get_payload (outbuf);
299 payload[0] = (FT & 3);
303 gst_adapter_copy (rtpac3pay->adapter, &payload[2], 0, payload_len);
304 gst_adapter_flush (rtpac3pay->adapter, payload_len);
306 avail -= payload_len;
308 gst_rtp_buffer_set_marker (outbuf, TRUE);
310 GST_BUFFER_TIMESTAMP (outbuf) = rtpac3pay->first_ts;
311 GST_BUFFER_DURATION (outbuf) = rtpac3pay->duration;
313 ret = gst_basertppayload_push (GST_BASE_RTP_PAYLOAD (rtpac3pay), outbuf);
320 gst_rtp_ac3_pay_handle_buffer (GstBaseRTPPayload * basepayload,
323 GstRtpAC3Pay *rtpac3pay;
325 guint size, avail, left, NF;
328 GstClockTime duration, timestamp;
330 rtpac3pay = GST_RTP_AC3_PAY (basepayload);
332 size = GST_BUFFER_SIZE (buffer);
333 data = GST_BUFFER_DATA (buffer);
334 duration = GST_BUFFER_DURATION (buffer);
335 timestamp = GST_BUFFER_TIMESTAMP (buffer);
337 if (GST_BUFFER_IS_DISCONT (buffer)) {
338 GST_DEBUG_OBJECT (rtpac3pay, "DISCONT");
339 gst_rtp_ac3_pay_reset (rtpac3pay);
342 /* count the amount of incomming packets */
347 guint bsid, fscod, frmsizecod, frame_size;
352 if (p[0] != 0x0b || p[1] != 0x77)
359 frmsizecod = p[4] & 0x3f;
362 GST_DEBUG_OBJECT (rtpac3pay, "fscod %u, %u", fscod, frmsizecod);
364 if (fscod >= 3 || frmsizecod >= 38)
367 frame_size = frmsizecod_tbl[frmsizecod].frm_size[fscod] * 2;
368 if (frame_size > left)
372 GST_DEBUG_OBJECT (rtpac3pay, "found frame %u of size %u", NF, frame_size);
380 avail = gst_adapter_available (rtpac3pay->adapter);
382 /* get packet length of previous data and this new data,
383 * payload length includes a 4 byte header */
384 packet_len = gst_rtp_buffer_calc_packet_len (2 + avail + size, 0, 0);
386 /* if this buffer is going to overflow the packet, flush what we
388 if (gst_basertppayload_is_filled (basepayload,
389 packet_len, rtpac3pay->duration + duration)) {
390 ret = gst_rtp_ac3_pay_flush (rtpac3pay);
397 GST_DEBUG_OBJECT (rtpac3pay,
398 "first packet, save timestamp %" GST_TIME_FORMAT,
399 GST_TIME_ARGS (timestamp));
400 rtpac3pay->first_ts = timestamp;
401 rtpac3pay->duration = 0;
405 gst_adapter_push (rtpac3pay->adapter, buffer);
406 rtpac3pay->duration += duration;
414 GST_WARNING_OBJECT (rtpac3pay, "no valid AC3 frames found");
419 static GstStateChangeReturn
420 gst_rtp_ac3_pay_change_state (GstElement * element, GstStateChange transition)
422 GstRtpAC3Pay *rtpac3pay;
423 GstStateChangeReturn ret;
425 rtpac3pay = GST_RTP_AC3_PAY (element);
427 switch (transition) {
428 case GST_STATE_CHANGE_READY_TO_PAUSED:
429 gst_rtp_ac3_pay_reset (rtpac3pay);
435 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
437 switch (transition) {
438 case GST_STATE_CHANGE_PAUSED_TO_READY:
439 gst_rtp_ac3_pay_reset (rtpac3pay);
448 gst_rtp_ac3_pay_plugin_init (GstPlugin * plugin)
450 return gst_element_register (plugin, "rtpac3pay",
451 GST_RANK_SECONDARY, GST_TYPE_RTP_AC3_PAY);