2 * Copyright (C) <2009> 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 "gstrtpceltpay.h"
30 GST_DEBUG_CATEGORY_STATIC (rtpceltpay_debug);
31 #define GST_CAT_DEFAULT (rtpceltpay_debug)
33 static GstStaticPadTemplate gst_rtp_celt_pay_sink_template =
34 GST_STATIC_PAD_TEMPLATE ("sink",
37 GST_STATIC_CAPS ("audio/x-celt, "
38 "rate = (int) [ 32000, 64000 ], "
39 "channels = (int) [1, 2], " "frame-size = (int) [ 64, 512 ]")
42 static GstStaticPadTemplate gst_rtp_celt_pay_src_template =
43 GST_STATIC_PAD_TEMPLATE ("src",
46 GST_STATIC_CAPS ("application/x-rtp, "
47 "media = (string) \"audio\", "
48 "payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", "
49 "clock-rate = (int) [ 32000, 48000 ], "
50 "encoding-name = (string) \"CELT\"")
53 static void gst_rtp_celt_pay_finalize (GObject * object);
55 static GstStateChangeReturn gst_rtp_celt_pay_change_state (GstElement *
56 element, GstStateChange transition);
58 static gboolean gst_rtp_celt_pay_setcaps (GstBaseRTPPayload * payload,
60 static GstCaps *gst_rtp_celt_pay_getcaps (GstBaseRTPPayload * payload,
62 static GstFlowReturn gst_rtp_celt_pay_handle_buffer (GstBaseRTPPayload *
63 payload, GstBuffer * buffer);
65 GST_BOILERPLATE (GstRtpCELTPay, gst_rtp_celt_pay, GstBaseRTPPayload,
66 GST_TYPE_BASE_RTP_PAYLOAD);
69 gst_rtp_celt_pay_base_init (gpointer klass)
71 GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
73 gst_element_class_add_static_pad_template (element_class,
74 &gst_rtp_celt_pay_sink_template);
75 gst_element_class_add_static_pad_template (element_class,
76 &gst_rtp_celt_pay_src_template);
77 gst_element_class_set_details_simple (element_class, "RTP CELT payloader",
78 "Codec/Payloader/Network/RTP",
79 "Payload-encodes CELT audio into a RTP packet",
80 "Wim Taymans <wim.taymans@gmail.com>");
82 GST_DEBUG_CATEGORY_INIT (rtpceltpay_debug, "rtpceltpay", 0,
83 "CELT RTP Payloader");
87 gst_rtp_celt_pay_class_init (GstRtpCELTPayClass * klass)
89 GObjectClass *gobject_class;
90 GstElementClass *gstelement_class;
91 GstBaseRTPPayloadClass *gstbasertppayload_class;
93 gobject_class = (GObjectClass *) klass;
94 gstelement_class = (GstElementClass *) klass;
95 gstbasertppayload_class = (GstBaseRTPPayloadClass *) klass;
97 gobject_class->finalize = gst_rtp_celt_pay_finalize;
99 gstelement_class->change_state = gst_rtp_celt_pay_change_state;
101 gstbasertppayload_class->set_caps = gst_rtp_celt_pay_setcaps;
102 gstbasertppayload_class->get_caps = gst_rtp_celt_pay_getcaps;
103 gstbasertppayload_class->handle_buffer = gst_rtp_celt_pay_handle_buffer;
107 gst_rtp_celt_pay_init (GstRtpCELTPay * rtpceltpay, GstRtpCELTPayClass * klass)
109 rtpceltpay->queue = g_queue_new ();
113 gst_rtp_celt_pay_finalize (GObject * object)
115 GstRtpCELTPay *rtpceltpay;
117 rtpceltpay = GST_RTP_CELT_PAY (object);
119 g_queue_free (rtpceltpay->queue);
121 G_OBJECT_CLASS (parent_class)->finalize (object);
125 gst_rtp_celt_pay_clear_queued (GstRtpCELTPay * rtpceltpay)
129 while ((buf = g_queue_pop_head (rtpceltpay->queue)))
130 gst_buffer_unref (buf);
132 rtpceltpay->bytes = 0;
133 rtpceltpay->sbytes = 0;
134 rtpceltpay->qduration = 0;
138 gst_rtp_celt_pay_add_queued (GstRtpCELTPay * rtpceltpay, GstBuffer * buffer,
139 guint ssize, guint size, GstClockTime duration)
141 g_queue_push_tail (rtpceltpay->queue, buffer);
142 rtpceltpay->sbytes += ssize;
143 rtpceltpay->bytes += size;
144 /* only add durations when we have a valid previous duration */
145 if (rtpceltpay->qduration != -1) {
147 /* only add valid durations */
148 rtpceltpay->qduration += duration;
150 /* if we add a buffer without valid duration, our total queued duration
152 rtpceltpay->qduration = -1;
157 gst_rtp_celt_pay_setcaps (GstBaseRTPPayload * payload, GstCaps * caps)
159 /* don't configure yet, we wait for the ident packet */
165 gst_rtp_celt_pay_getcaps (GstBaseRTPPayload * payload, GstPad * pad)
167 GstCaps *otherpadcaps;
171 otherpadcaps = gst_pad_get_allowed_caps (payload->srcpad);
172 caps = gst_caps_copy (gst_pad_get_pad_template_caps (pad));
175 if (!gst_caps_is_empty (otherpadcaps)) {
176 GstStructure *ps = gst_caps_get_structure (otherpadcaps, 0);
177 GstStructure *s = gst_caps_get_structure (caps, 0);
178 gint clock_rate = 0, frame_size = 0, channels = 1;
180 if (gst_structure_get_int (ps, "clock-rate", &clock_rate)) {
181 gst_structure_fixate_field_nearest_int (s, "rate", clock_rate);
184 if ((params = gst_structure_get_string (ps, "frame-size")))
185 frame_size = atoi (params);
187 gst_structure_set (s, "frame-size", G_TYPE_INT, frame_size, NULL);
189 if ((params = gst_structure_get_string (ps, "encoding-params"))) {
190 channels = atoi (params);
191 gst_structure_fixate_field_nearest_int (s, "channels", channels);
194 GST_DEBUG_OBJECT (payload, "clock-rate=%d frame-size=%d channels=%d",
195 clock_rate, frame_size, channels);
197 gst_caps_unref (otherpadcaps);
204 gst_rtp_celt_pay_parse_ident (GstRtpCELTPay * rtpceltpay,
205 const guint8 * data, guint size)
207 guint32 version, header_size, rate, nb_channels, frame_size, overlap;
208 guint32 bytes_per_packet;
209 GstBaseRTPPayload *payload;
213 /* we need the header string (8), the version string (20), the version
214 * and the header length. */
218 if (!g_str_has_prefix ((const gchar *) data, "CELT "))
221 /* skip header and version string */
224 version = GST_READ_UINT32_LE (data);
225 GST_DEBUG_OBJECT (rtpceltpay, "version %08x", version);
233 header_size = GST_READ_UINT32_LE (data);
234 if (header_size < 56)
235 goto header_too_small;
237 if (size < header_size)
238 goto payload_too_small;
241 rate = GST_READ_UINT32_LE (data);
243 nb_channels = GST_READ_UINT32_LE (data);
245 frame_size = GST_READ_UINT32_LE (data);
247 overlap = GST_READ_UINT32_LE (data);
249 bytes_per_packet = GST_READ_UINT32_LE (data);
251 GST_DEBUG_OBJECT (rtpceltpay, "rate %d, nb_channels %d, frame_size %d",
252 rate, nb_channels, frame_size);
253 GST_DEBUG_OBJECT (rtpceltpay, "overlap %d, bytes_per_packet %d",
254 overlap, bytes_per_packet);
256 payload = GST_BASE_RTP_PAYLOAD (rtpceltpay);
258 gst_basertppayload_set_options (payload, "audio", FALSE, "CELT", rate);
259 cstr = g_strdup_printf ("%d", nb_channels);
260 fsstr = g_strdup_printf ("%d", frame_size);
261 res = gst_basertppayload_set_outcaps (payload, "encoding-params",
262 G_TYPE_STRING, cstr, "frame-size", G_TYPE_STRING, fsstr, NULL);
271 GST_DEBUG_OBJECT (rtpceltpay,
272 "ident packet too small, need at least 32 bytes");
277 GST_DEBUG_OBJECT (rtpceltpay,
278 "ident packet does not start with \"CELT \"");
284 GST_DEBUG_OBJECT (rtpceltpay, "can only handle version 1, have version %d",
291 GST_DEBUG_OBJECT (rtpceltpay,
292 "header size too small, need at least 80 bytes, " "got only %d",
298 GST_DEBUG_OBJECT (rtpceltpay,
299 "payload too small, need at least %d bytes, got only %d", header_size,
306 gst_rtp_celt_pay_flush_queued (GstRtpCELTPay * rtpceltpay)
309 GstBuffer *buf, *outbuf;
310 guint8 *payload, *spayload;
312 GstClockTime duration;
314 payload_len = rtpceltpay->bytes + rtpceltpay->sbytes;
315 duration = rtpceltpay->qduration;
317 GST_DEBUG_OBJECT (rtpceltpay, "flushing out %u, duration %" GST_TIME_FORMAT,
318 payload_len, GST_TIME_ARGS (rtpceltpay->qduration));
320 /* get a big enough packet for the sizes + payloads */
321 outbuf = gst_rtp_buffer_new_allocate (payload_len, 0, 0);
323 GST_BUFFER_DURATION (outbuf) = duration;
325 /* point to the payload for size headers and data */
326 spayload = gst_rtp_buffer_get_payload (outbuf);
327 payload = spayload + rtpceltpay->sbytes;
329 while ((buf = g_queue_pop_head (rtpceltpay->queue))) {
332 /* copy first timestamp to output */
333 if (GST_BUFFER_TIMESTAMP (outbuf) == -1)
334 GST_BUFFER_TIMESTAMP (outbuf) = GST_BUFFER_TIMESTAMP (buf);
336 /* write the size to the header */
337 size = GST_BUFFER_SIZE (buf);
338 while (size > 0xff) {
344 size = GST_BUFFER_SIZE (buf);
346 memcpy (payload, GST_BUFFER_DATA (buf), size);
349 gst_buffer_unref (buf);
352 /* we consumed it all */
353 rtpceltpay->bytes = 0;
354 rtpceltpay->sbytes = 0;
355 rtpceltpay->qduration = 0;
357 ret = gst_basertppayload_push (GST_BASE_RTP_PAYLOAD (rtpceltpay), outbuf);
363 gst_rtp_celt_pay_handle_buffer (GstBaseRTPPayload * basepayload,
367 GstRtpCELTPay *rtpceltpay;
368 guint size, payload_len;
370 GstClockTime duration, packet_dur;
371 guint i, ssize, packet_len;
373 rtpceltpay = GST_RTP_CELT_PAY (basepayload);
377 size = GST_BUFFER_SIZE (buffer);
378 data = GST_BUFFER_DATA (buffer);
380 switch (rtpceltpay->packet) {
382 /* ident packet. We need to parse the headers to construct the RTP
384 if (!gst_rtp_celt_pay_parse_ident (rtpceltpay, data, size))
389 /* comment packet, we ignore it */
392 /* other packets go in the payload */
396 duration = GST_BUFFER_DURATION (buffer);
398 GST_LOG_OBJECT (rtpceltpay,
399 "got buffer of duration %" GST_TIME_FORMAT ", size %u",
400 GST_TIME_ARGS (duration), size);
402 /* calculate the size of the size field and the payload */
404 for (i = size; i > 0xff; i -= 0xff)
407 GST_DEBUG_OBJECT (rtpceltpay, "bytes for size %u", ssize);
409 /* calculate what the new size and duration would be of the packet */
410 payload_len = ssize + size + rtpceltpay->bytes + rtpceltpay->sbytes;
411 if (rtpceltpay->qduration != -1 && duration != -1)
412 packet_dur = rtpceltpay->qduration + duration;
416 packet_len = gst_rtp_buffer_calc_packet_len (payload_len, 0, 0);
418 if (gst_basertppayload_is_filled (basepayload, packet_len, packet_dur)) {
419 /* size or duration would overflow the packet, flush the queued data */
420 ret = gst_rtp_celt_pay_flush_queued (rtpceltpay);
423 /* queue the packet */
424 gst_rtp_celt_pay_add_queued (rtpceltpay, buffer, ssize, size, duration);
427 rtpceltpay->packet++;
434 GST_ELEMENT_ERROR (rtpceltpay, STREAM, DECODE, (NULL),
435 ("Error parsing first identification packet."));
436 return GST_FLOW_ERROR;
440 static GstStateChangeReturn
441 gst_rtp_celt_pay_change_state (GstElement * element, GstStateChange transition)
443 GstRtpCELTPay *rtpceltpay;
444 GstStateChangeReturn ret;
446 rtpceltpay = GST_RTP_CELT_PAY (element);
448 switch (transition) {
449 case GST_STATE_CHANGE_NULL_TO_READY:
451 case GST_STATE_CHANGE_READY_TO_PAUSED:
452 rtpceltpay->packet = 0;
458 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
460 switch (transition) {
461 case GST_STATE_CHANGE_PAUSED_TO_READY:
462 gst_rtp_celt_pay_clear_queued (rtpceltpay);
464 case GST_STATE_CHANGE_READY_TO_NULL:
473 gst_rtp_celt_pay_plugin_init (GstPlugin * plugin)
475 return gst_element_register (plugin, "rtpceltpay",
476 GST_RANK_SECONDARY, GST_TYPE_RTP_CELT_PAY);