1 /* GStreamer
2 * Copyright (C) <2006> Wim Taymans <wim.taymans@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 <gst/tag/tag.h>
25 #include <gst/rtp/gstrtpbuffer.h>
26 #include <gst/audio/audio.h>
27
28 #include <string.h>
29 #include "gstrtpvorbisdepay.h"
30 #include "gstrtputils.h"
31
32 GST_DEBUG_CATEGORY_STATIC (rtpvorbisdepay_debug);
33 #define GST_CAT_DEFAULT (rtpvorbisdepay_debug)
34
35 /* references:
36 * http://www.rfc-editor.org/rfc/rfc5215.txt
37 */
38
39 static GstStaticPadTemplate gst_rtp_vorbis_depay_sink_template =
40 GST_STATIC_PAD_TEMPLATE ("sink",
41 GST_PAD_SINK,
42 GST_PAD_ALWAYS,
43 GST_STATIC_CAPS ("application/x-rtp, "
44 "media = (string) \"audio\", "
45 "clock-rate = (int) [1, MAX ], " "encoding-name = (string) \"VORBIS\""
46 /* All required parameters
47 *
48 * "encoding-params = (string) <num channels>"
49 * "configuration = (string) ANY"
50 */
51 )
52 );
53
54 static GstStaticPadTemplate gst_rtp_vorbis_depay_src_template =
55 GST_STATIC_PAD_TEMPLATE ("src",
56 GST_PAD_SRC,
57 GST_PAD_ALWAYS,
58 GST_STATIC_CAPS ("audio/x-vorbis")
59 );
60
61 #define gst_rtp_vorbis_depay_parent_class parent_class
62 G_DEFINE_TYPE (GstRtpVorbisDepay, gst_rtp_vorbis_depay,
63 GST_TYPE_RTP_BASE_DEPAYLOAD);
64
65 static gboolean gst_rtp_vorbis_depay_setcaps (GstRTPBaseDepayload * depayload,
66 GstCaps * caps);
67 static GstBuffer *gst_rtp_vorbis_depay_process (GstRTPBaseDepayload * depayload,
68 GstRTPBuffer * rtp);
69
70 static void gst_rtp_vorbis_depay_finalize (GObject * object);
71
72 static GstStateChangeReturn gst_rtp_vorbis_depay_change_state (GstElement *
73 element, GstStateChange transition);
74
75 static void
gst_rtp_vorbis_depay_class_init(GstRtpVorbisDepayClass * klass)76 gst_rtp_vorbis_depay_class_init (GstRtpVorbisDepayClass * klass)
77 {
78 GObjectClass *gobject_class;
79 GstElementClass *gstelement_class;
80 GstRTPBaseDepayloadClass *gstrtpbasedepayload_class;
81
82 gobject_class = (GObjectClass *) klass;
83 gstelement_class = (GstElementClass *) klass;
84 gstrtpbasedepayload_class = (GstRTPBaseDepayloadClass *) klass;
85
86 gobject_class->finalize = gst_rtp_vorbis_depay_finalize;
87
88 gstelement_class->change_state = gst_rtp_vorbis_depay_change_state;
89
90 gstrtpbasedepayload_class->process_rtp_packet = gst_rtp_vorbis_depay_process;
91 gstrtpbasedepayload_class->set_caps = gst_rtp_vorbis_depay_setcaps;
92
93 gst_element_class_add_static_pad_template (gstelement_class,
94 &gst_rtp_vorbis_depay_sink_template);
95 gst_element_class_add_static_pad_template (gstelement_class,
96 &gst_rtp_vorbis_depay_src_template);
97
98 gst_element_class_set_static_metadata (gstelement_class,
99 "RTP Vorbis depayloader", "Codec/Depayloader/Network/RTP",
100 "Extracts Vorbis Audio from RTP packets (RFC 5215)",
101 "Wim Taymans <wim.taymans@gmail.com>");
102
103 GST_DEBUG_CATEGORY_INIT (rtpvorbisdepay_debug, "rtpvorbisdepay", 0,
104 "Vorbis RTP Depayloader");
105 }
106
107 static void
gst_rtp_vorbis_depay_init(GstRtpVorbisDepay * rtpvorbisdepay)108 gst_rtp_vorbis_depay_init (GstRtpVorbisDepay * rtpvorbisdepay)
109 {
110 rtpvorbisdepay->adapter = gst_adapter_new ();
111 }
112
113 static void
free_config(GstRtpVorbisConfig * conf)114 free_config (GstRtpVorbisConfig * conf)
115 {
116 g_list_free_full (conf->headers, (GDestroyNotify) gst_buffer_unref);
117 g_free (conf);
118 }
119
120 static void
free_indents(GstRtpVorbisDepay * rtpvorbisdepay)121 free_indents (GstRtpVorbisDepay * rtpvorbisdepay)
122 {
123 g_list_free_full (rtpvorbisdepay->configs, (GDestroyNotify) free_config);
124 rtpvorbisdepay->configs = NULL;
125 }
126
127 static void
gst_rtp_vorbis_depay_finalize(GObject * object)128 gst_rtp_vorbis_depay_finalize (GObject * object)
129 {
130 GstRtpVorbisDepay *rtpvorbisdepay = GST_RTP_VORBIS_DEPAY (object);
131
132 g_object_unref (rtpvorbisdepay->adapter);
133
134 G_OBJECT_CLASS (parent_class)->finalize (object);
135 }
136
137 static gboolean
gst_rtp_vorbis_depay_has_ident(GstRtpVorbisDepay * rtpvorbisdepay,guint32 ident)138 gst_rtp_vorbis_depay_has_ident (GstRtpVorbisDepay * rtpvorbisdepay,
139 guint32 ident)
140 {
141 GList *walk;
142
143 for (walk = rtpvorbisdepay->configs; walk; walk = g_list_next (walk)) {
144 GstRtpVorbisConfig *conf = (GstRtpVorbisConfig *) walk->data;
145
146 if (conf->ident == ident)
147 return TRUE;
148 }
149
150 return FALSE;
151 }
152
153 /* takes ownership of confbuf */
154 static gboolean
gst_rtp_vorbis_depay_parse_configuration(GstRtpVorbisDepay * rtpvorbisdepay,GstBuffer * confbuf)155 gst_rtp_vorbis_depay_parse_configuration (GstRtpVorbisDepay * rtpvorbisdepay,
156 GstBuffer * confbuf)
157 {
158 GstBuffer *buf;
159 guint32 num_headers;
160 GstMapInfo map;
161 guint8 *data;
162 gsize size;
163 guint offset;
164 gint i, j;
165
166 gst_buffer_map (confbuf, &map, GST_MAP_READ);
167 data = map.data;
168 size = map.size;
169
170 GST_DEBUG_OBJECT (rtpvorbisdepay, "config size %" G_GSIZE_FORMAT, size);
171
172 /* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
173 * | Number of packed headers |
174 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
175 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
176 * | Packed header |
177 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
178 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
179 * | Packed header |
180 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
181 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
182 * | .... |
183 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
184 */
185 if (size < 4)
186 goto too_small;
187
188 num_headers = GST_READ_UINT32_BE (data);
189 size -= 4;
190 data += 4;
191 offset = 4;
192
193 GST_DEBUG_OBJECT (rtpvorbisdepay, "have %u headers", num_headers);
194
195 /* 0 1 2 3
196 * 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
197 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
198 * | Ident | length ..
199 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
200 * .. | n. of headers | length1 | length2 ..
201 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
202 * .. | Identification Header ..
203 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
204 * .................................................................
205 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
206 * .. | Comment Header ..
207 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
208 * .................................................................
209 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
210 * .. Comment Header |
211 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
212 * | Setup Header ..
213 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
214 * .................................................................
215 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
216 * .. Setup Header |
217 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
218 */
219 for (i = 0; i < num_headers; i++) {
220 guint32 ident;
221 guint16 length;
222 guint8 n_headers, b;
223 GstRtpVorbisConfig *conf;
224 guint *h_sizes;
225 guint extra = 1;
226
227 if (size < 6)
228 goto too_small;
229
230 ident = (data[0] << 16) | (data[1] << 8) | data[2];
231 length = (data[3] << 8) | data[4];
232 n_headers = data[5];
233 size -= 6;
234 data += 6;
235 offset += 6;
236
237 GST_DEBUG_OBJECT (rtpvorbisdepay,
238 "header %d, ident 0x%08x, length %u, left %" G_GSIZE_FORMAT, i, ident,
239 length, size);
240
241 /* FIXME check if we already got this ident */
242
243 /* length might also include count of following size fields */
244 if (size < length && size + 1 != length)
245 goto too_small;
246
247 if (gst_rtp_vorbis_depay_has_ident (rtpvorbisdepay, ident)) {
248 size -= length;
249 data += length;
250 offset += length;
251 continue;
252 }
253
254 /* read header sizes we read 2 sizes, the third size (for which we allocate
255 * space) must be derived from the total packed header length. */
256 h_sizes = g_newa (guint, n_headers + 1);
257 for (j = 0; j < n_headers; j++) {
258 guint h_size;
259
260 h_size = 0;
261 do {
262 if (size < 1)
263 goto too_small;
264 b = *data++;
265 offset++;
266 extra++;
267 size--;
268 h_size = (h_size << 7) | (b & 0x7f);
269 } while (b & 0x80);
270 GST_DEBUG_OBJECT (rtpvorbisdepay, "headers %d: size: %u", j, h_size);
271
272 if (length < h_size)
273 goto too_small;
274
275 h_sizes[j] = h_size;
276 length -= h_size;
277 }
278 /* last header length is the remaining space */
279 GST_DEBUG_OBJECT (rtpvorbisdepay, "last header size: %u", length);
280 h_sizes[j] = length;
281
282 GST_DEBUG_OBJECT (rtpvorbisdepay, "preparing headers");
283 conf = g_new0 (GstRtpVorbisConfig, 1);
284 conf->ident = ident;
285
286 for (j = 0; j <= n_headers; j++) {
287 guint h_size;
288
289 h_size = h_sizes[j];
290 if (size < h_size) {
291 if (j != n_headers || size + extra != h_size) {
292 free_config (conf);
293 goto too_small;
294 } else {
295 /* otherwise means that overall length field contained total length,
296 * including extra fields */
297 h_size -= extra;
298 }
299 }
300
301 GST_DEBUG_OBJECT (rtpvorbisdepay, "reading header %d, size %u", j,
302 h_size);
303
304 buf = gst_buffer_copy_region (confbuf, GST_BUFFER_COPY_ALL, offset,
305 h_size);
306 conf->headers = g_list_append (conf->headers, buf);
307 offset += h_size;
308 size -= h_size;
309 }
310 rtpvorbisdepay->configs = g_list_append (rtpvorbisdepay->configs, conf);
311 }
312
313 gst_buffer_unmap (confbuf, &map);
314 gst_buffer_unref (confbuf);
315
316 return TRUE;
317
318 /* ERRORS */
319 too_small:
320 {
321 GST_DEBUG_OBJECT (rtpvorbisdepay, "configuration too small");
322 gst_buffer_unmap (confbuf, &map);
323 gst_buffer_unref (confbuf);
324 return FALSE;
325 }
326 }
327
328 static gboolean
gst_rtp_vorbis_depay_parse_inband_configuration(GstRtpVorbisDepay * rtpvorbisdepay,guint ident,guint8 * configuration,guint size,guint length)329 gst_rtp_vorbis_depay_parse_inband_configuration (GstRtpVorbisDepay *
330 rtpvorbisdepay, guint ident, guint8 * configuration, guint size,
331 guint length)
332 {
333 GstBuffer *confbuf;
334 GstMapInfo map;
335
336 if (G_UNLIKELY (size < 4))
337 return FALSE;
338
339 /* transform inline to out-of-band and parse that one */
340 confbuf = gst_buffer_new_and_alloc (size + 9);
341 gst_buffer_map (confbuf, &map, GST_MAP_WRITE);
342 /* 1 header */
343 GST_WRITE_UINT32_BE (map.data, 1);
344 /* write Ident */
345 GST_WRITE_UINT24_BE (map.data + 4, ident);
346 /* write sort-of-length */
347 GST_WRITE_UINT16_BE (map.data + 7, length);
348 /* copy remainder */
349 memcpy (map.data + 9, configuration, size);
350 gst_buffer_unmap (confbuf, &map);
351
352 return gst_rtp_vorbis_depay_parse_configuration (rtpvorbisdepay, confbuf);
353 }
354
355 static gboolean
gst_rtp_vorbis_depay_setcaps(GstRTPBaseDepayload * depayload,GstCaps * caps)356 gst_rtp_vorbis_depay_setcaps (GstRTPBaseDepayload * depayload, GstCaps * caps)
357 {
358 GstStructure *structure;
359 GstRtpVorbisDepay *rtpvorbisdepay;
360 GstCaps *srccaps;
361 const gchar *configuration;
362 gint clock_rate;
363 gboolean res;
364
365 rtpvorbisdepay = GST_RTP_VORBIS_DEPAY (depayload);
366
367 structure = gst_caps_get_structure (caps, 0);
368
369 /* get clockrate */
370 if (!gst_structure_get_int (structure, "clock-rate", &clock_rate))
371 goto no_rate;
372
373 /* read and parse configuration string */
374 configuration = gst_structure_get_string (structure, "configuration");
375 if (configuration) {
376 GstBuffer *confbuf;
377 guint8 *data;
378 gsize size;
379
380 /* deserialize base64 to buffer */
381 data = g_base64_decode (configuration, &size);
382
383 confbuf = gst_buffer_new ();
384 gst_buffer_append_memory (confbuf,
385 gst_memory_new_wrapped (0, data, size, 0, size, data, g_free));
386 if (!gst_rtp_vorbis_depay_parse_configuration (rtpvorbisdepay, confbuf))
387 goto invalid_configuration;
388 } else {
389 GST_WARNING_OBJECT (rtpvorbisdepay, "no configuration specified");
390 }
391
392 /* caps seem good, configure element */
393 depayload->clock_rate = clock_rate;
394
395 /* set caps on pad and on header */
396 srccaps = gst_caps_new_empty_simple ("audio/x-vorbis");
397 res = gst_pad_set_caps (depayload->srcpad, srccaps);
398 gst_caps_unref (srccaps);
399
400 return res;
401
402 /* ERRORS */
403 invalid_configuration:
404 {
405 GST_ERROR_OBJECT (rtpvorbisdepay, "invalid configuration specified");
406 return FALSE;
407 }
408 no_rate:
409 {
410 GST_ERROR_OBJECT (rtpvorbisdepay, "no clock-rate specified");
411 return FALSE;
412 }
413 }
414
415 static gboolean
gst_rtp_vorbis_depay_switch_codebook(GstRtpVorbisDepay * rtpvorbisdepay,guint32 ident)416 gst_rtp_vorbis_depay_switch_codebook (GstRtpVorbisDepay * rtpvorbisdepay,
417 guint32 ident)
418 {
419 GList *walk;
420 gboolean res = FALSE;
421
422 GST_DEBUG_OBJECT (rtpvorbisdepay, "Looking up code book ident 0x%08x", ident);
423 for (walk = rtpvorbisdepay->configs; walk; walk = g_list_next (walk)) {
424 GstRtpVorbisConfig *conf = (GstRtpVorbisConfig *) walk->data;
425
426 if (conf->ident == ident) {
427 GList *headers;
428
429 /* FIXME, remove pads, create new pad.. */
430
431 /* push out all the headers */
432 for (headers = conf->headers; headers; headers = g_list_next (headers)) {
433 GstBuffer *header = GST_BUFFER_CAST (headers->data);
434
435 gst_buffer_ref (header);
436 gst_rtp_base_depayload_push (GST_RTP_BASE_DEPAYLOAD (rtpvorbisdepay),
437 header);
438 }
439 /* remember the current config */
440 rtpvorbisdepay->config = conf;
441 res = TRUE;
442 }
443 }
444 if (!res) {
445 /* we don't know about the headers, figure out an alternative method for
446 * getting the codebooks. FIXME, fail for now. */
447 }
448 return res;
449 }
450
451 static GstBuffer *
gst_rtp_vorbis_depay_process(GstRTPBaseDepayload * depayload,GstRTPBuffer * rtp)452 gst_rtp_vorbis_depay_process (GstRTPBaseDepayload * depayload,
453 GstRTPBuffer * rtp)
454 {
455 GstRtpVorbisDepay *rtpvorbisdepay;
456 GstBuffer *outbuf;
457 GstFlowReturn ret;
458 gint payload_len;
459 GstBuffer *payload_buffer = NULL;
460 guint8 *payload;
461 GstMapInfo map;
462 guint32 header, ident;
463 guint8 F, VDT, packets;
464 guint length;
465
466 rtpvorbisdepay = GST_RTP_VORBIS_DEPAY (depayload);
467
468 payload_len = gst_rtp_buffer_get_payload_len (rtp);
469
470 GST_DEBUG_OBJECT (depayload, "got RTP packet of size %d", payload_len);
471
472 /* we need at least 4 bytes for the packet header */
473 if (G_UNLIKELY (payload_len < 4))
474 goto packet_short;
475
476 payload = gst_rtp_buffer_get_payload (rtp);
477 header = GST_READ_UINT32_BE (payload);
478 /*
479 * 0 1 2 3
480 * 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
481 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
482 * | Ident | F |VDT|# pkts.|
483 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
484 *
485 * F: Fragment type (0=none, 1=start, 2=cont, 3=end)
486 * VDT: Vorbis data type (0=vorbis, 1=config, 2=comment, 3=reserved)
487 * pkts: number of packets.
488 */
489 VDT = (header & 0x30) >> 4;
490 if (G_UNLIKELY (VDT == 3))
491 goto ignore_reserved;
492
493 GST_DEBUG_OBJECT (depayload, "header: 0x%08x", header);
494 ident = (header >> 8) & 0xffffff;
495 F = (header & 0xc0) >> 6;
496 packets = (header & 0xf);
497
498 if (VDT == 0) {
499 gboolean do_switch = FALSE;
500
501 /* we have a raw payload, find the codebook for the ident */
502 if (!rtpvorbisdepay->config) {
503 /* we don't have an active codebook, find the codebook and
504 * activate it */
505 GST_DEBUG_OBJECT (rtpvorbisdepay, "No active codebook, switching");
506 do_switch = TRUE;
507 } else if (rtpvorbisdepay->config->ident != ident) {
508 /* codebook changed */
509 GST_DEBUG_OBJECT (rtpvorbisdepay, "codebook changed, switching");
510 do_switch = TRUE;
511 }
512 if (do_switch) {
513 if (!gst_rtp_vorbis_depay_switch_codebook (rtpvorbisdepay, ident))
514 goto switch_failed;
515 }
516 }
517
518 GST_DEBUG_OBJECT (depayload, "ident: %u, F: %d, VDT: %d, packets: %d", ident,
519 F, VDT, packets);
520
521 /* fragmented packets, assemble */
522 if (F != 0) {
523 GstBuffer *vdata;
524
525 if (F == 1) {
526 /* if we start a packet, clear adapter and start assembling. */
527 gst_adapter_clear (rtpvorbisdepay->adapter);
528 GST_DEBUG_OBJECT (depayload, "start assemble");
529 rtpvorbisdepay->assembling = TRUE;
530 }
531
532 if (!rtpvorbisdepay->assembling)
533 goto no_output;
534
535 /* skip header and length. */
536 vdata = gst_rtp_buffer_get_payload_subbuffer (rtp, 6, -1);
537
538 GST_DEBUG_OBJECT (depayload, "assemble vorbis packet");
539 gst_adapter_push (rtpvorbisdepay->adapter, vdata);
540
541 /* packet is not complete, we are done */
542 if (F != 3)
543 goto no_output;
544
545 /* construct assembled buffer */
546 length = gst_adapter_available (rtpvorbisdepay->adapter);
547 payload_buffer = gst_adapter_take_buffer (rtpvorbisdepay->adapter, length);
548 } else {
549 payload_buffer = gst_rtp_buffer_get_payload_subbuffer (rtp, 4, -1);
550 length = 0;
551 }
552
553 GST_DEBUG_OBJECT (depayload, "assemble done");
554
555 gst_buffer_map (payload_buffer, &map, GST_MAP_READ);
556 payload = map.data;
557 payload_len = map.size;
558
559 /* we not assembling anymore now */
560 rtpvorbisdepay->assembling = FALSE;
561 gst_adapter_clear (rtpvorbisdepay->adapter);
562
563 /* payload now points to a length with that many vorbis data bytes.
564 * Iterate over the packets and send them out.
565 *
566 * 0 1 2 3
567 * 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
568 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
569 * | length | vorbis data ..
570 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
571 * .. vorbis data |
572 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
573 * | length | next vorbis packet data ..
574 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
575 * .. vorbis data |
576 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+*
577 */
578 while (payload_len > 2) {
579 /* If length is not 0, we have a reassembled packet for which we
580 * calculated the length already and don't have to skip over the
581 * length field anymore
582 */
583 if (length == 0) {
584 length = GST_READ_UINT16_BE (payload);
585 payload += 2;
586 payload_len -= 2;
587 }
588
589 GST_DEBUG_OBJECT (depayload, "read length %u, avail: %d", length,
590 payload_len);
591
592 /* skip packet if something odd happens */
593 if (G_UNLIKELY (length > payload_len))
594 goto length_short;
595
596 /* handle in-band configuration */
597 if (G_UNLIKELY (VDT == 1)) {
598 GST_DEBUG_OBJECT (rtpvorbisdepay, "in-band configuration");
599 if (!gst_rtp_vorbis_depay_parse_inband_configuration (rtpvorbisdepay,
600 ident, payload, payload_len, length))
601 goto invalid_configuration;
602 goto no_output;
603 }
604
605 /* create buffer for packet */
606 outbuf =
607 gst_buffer_copy_region (payload_buffer, GST_BUFFER_COPY_ALL,
608 payload - map.data, length);
609
610 payload += length;
611 payload_len -= length;
612 /* make sure to read next length */
613 length = 0;
614
615 ret = gst_rtp_base_depayload_push (depayload, outbuf);
616 if (ret != GST_FLOW_OK)
617 break;
618 }
619
620 gst_buffer_unmap (payload_buffer, &map);
621 gst_buffer_unref (payload_buffer);
622
623 return NULL;
624
625 no_output:
626 {
627 if (payload_buffer) {
628 gst_buffer_unmap (payload_buffer, &map);
629 gst_buffer_unref (payload_buffer);
630 }
631 return NULL;
632 }
633 /* ERORRS */
634 switch_failed:
635 {
636 GST_ELEMENT_WARNING (rtpvorbisdepay, STREAM, DECODE,
637 (NULL), ("Could not switch codebooks"));
638 return NULL;
639 }
640 packet_short:
641 {
642 GST_ELEMENT_WARNING (rtpvorbisdepay, STREAM, DECODE,
643 (NULL), ("Packet was too short (%d < 4)", payload_len));
644 return NULL;
645 }
646 ignore_reserved:
647 {
648 GST_WARNING_OBJECT (rtpvorbisdepay, "reserved VDT ignored");
649 return NULL;
650 }
651 length_short:
652 {
653 GST_ELEMENT_WARNING (rtpvorbisdepay, STREAM, DECODE,
654 (NULL), ("Packet contains invalid data"));
655 if (payload_buffer) {
656 gst_buffer_unmap (payload_buffer, &map);
657 gst_buffer_unref (payload_buffer);
658 }
659 return NULL;
660 }
661 invalid_configuration:
662 {
663 /* fatal, as we otherwise risk carrying on without output */
664 GST_ELEMENT_ERROR (rtpvorbisdepay, STREAM, DECODE,
665 (NULL), ("Packet contains invalid configuration"));
666 if (payload_buffer) {
667 gst_buffer_unmap (payload_buffer, &map);
668 gst_buffer_unref (payload_buffer);
669 }
670 return NULL;
671 }
672 }
673
674 static GstStateChangeReturn
gst_rtp_vorbis_depay_change_state(GstElement * element,GstStateChange transition)675 gst_rtp_vorbis_depay_change_state (GstElement * element,
676 GstStateChange transition)
677 {
678 GstRtpVorbisDepay *rtpvorbisdepay;
679 GstStateChangeReturn ret;
680
681 rtpvorbisdepay = GST_RTP_VORBIS_DEPAY (element);
682
683 switch (transition) {
684 case GST_STATE_CHANGE_NULL_TO_READY:
685 break;
686 case GST_STATE_CHANGE_READY_TO_PAUSED:
687 break;
688 default:
689 break;
690 }
691
692 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
693
694 switch (transition) {
695 case GST_STATE_CHANGE_PAUSED_TO_READY:
696 free_indents (rtpvorbisdepay);
697 break;
698 case GST_STATE_CHANGE_READY_TO_NULL:
699 break;
700 default:
701 break;
702 }
703 return ret;
704 }
705
706 gboolean
gst_rtp_vorbis_depay_plugin_init(GstPlugin * plugin)707 gst_rtp_vorbis_depay_plugin_init (GstPlugin * plugin)
708 {
709 return gst_element_register (plugin, "rtpvorbisdepay",
710 GST_RANK_SECONDARY, GST_TYPE_RTP_VORBIS_DEPAY);
711 }
712