1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
|
/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
* <2002> Wim Taymans <wim.taymans@chello.be>
* <2006> Tim-Philipp Müller <tim centricular net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include "gstcdxaparse.h"
#include "gstvcdparse.h"
#include <gst/riff/riff-ids.h>
#include <gst/riff/riff-read.h>
GST_DEBUG_CATEGORY (vcdparse_debug);
GST_DEBUG_CATEGORY_STATIC (cdxaparse_debug);
#define GST_CAT_DEFAULT cdxaparse_debug
static gboolean gst_cdxa_parse_sink_activate (GstPad * sinkpad);
static void gst_cdxa_parse_loop (GstPad * sinkpad);
static gboolean gst_cdxa_parse_sink_activate_pull (GstPad * sinkpad,
gboolean active);
static gboolean gst_cdxa_parse_sink_activate (GstPad * sinkpad);
static GstStateChangeReturn gst_cdxa_parse_change_state (GstElement * element,
GstStateChange transition);
static gboolean gst_cdxa_parse_src_event (GstPad * srcpad, GstEvent * event);
static gboolean gst_cdxa_parse_src_query (GstPad * srcpad, GstQuery * query);
static GstStaticPadTemplate sink_template_factory =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-cdxa")
);
static GstStaticPadTemplate src_template_factory =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/mpeg, " "systemstream = (boolean) TRUE")
);
GST_BOILERPLATE (GstCDXAParse, gst_cdxa_parse, GstElement, GST_TYPE_ELEMENT);
static void
gst_cdxa_parse_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details_simple (element_class, "(S)VCD parser",
"Codec/Parser",
"Parse a .dat file from (S)VCD into raw MPEG-1",
"Wim Taymans <wim.taymans@tvd.be>");
/* register src pads */
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sink_template_factory));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&src_template_factory));
}
static void
gst_cdxa_parse_class_init (GstCDXAParseClass * klass)
{
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_cdxa_parse_change_state);
}
static void
gst_cdxa_parse_init (GstCDXAParse * cdxaparse, GstCDXAParseClass * klass)
{
GstCaps *caps;
cdxaparse->sinkpad =
gst_pad_new_from_static_template (&sink_template_factory, "sink");
gst_pad_set_activate_function (cdxaparse->sinkpad,
GST_DEBUG_FUNCPTR (gst_cdxa_parse_sink_activate));
gst_pad_set_activatepull_function (cdxaparse->sinkpad,
GST_DEBUG_FUNCPTR (gst_cdxa_parse_sink_activate_pull));
gst_element_add_pad (GST_ELEMENT (cdxaparse), cdxaparse->sinkpad);
cdxaparse->srcpad =
gst_pad_new_from_static_template (&src_template_factory, "src");
gst_pad_set_event_function (cdxaparse->srcpad,
GST_DEBUG_FUNCPTR (gst_cdxa_parse_src_event));
gst_pad_set_query_function (cdxaparse->srcpad,
GST_DEBUG_FUNCPTR (gst_cdxa_parse_src_query));
caps = gst_caps_new_simple ("video/mpeg",
"systemstream", G_TYPE_BOOLEAN, TRUE, NULL);
gst_pad_use_fixed_caps (cdxaparse->srcpad);
gst_pad_set_caps (cdxaparse->srcpad, caps);
gst_caps_unref (caps);
gst_element_add_pad (GST_ELEMENT (cdxaparse), cdxaparse->srcpad);
cdxaparse->state = GST_CDXA_PARSE_START;
cdxaparse->offset = 0;
cdxaparse->datasize = 0;
cdxaparse->datastart = -1;
}
#define HAVE_FOURCC(data,fourcc) (GST_READ_UINT32_LE((data))==(fourcc))
static gboolean
gst_cdxa_parse_stream_init (GstCDXAParse * cdxa)
{
GstFlowReturn flow_ret;
GstBuffer *buf = NULL;
guint8 *data;
flow_ret = gst_pad_pull_range (cdxa->sinkpad, cdxa->offset, 12, &buf);
if (flow_ret != GST_FLOW_OK)
return flow_ret;
if (GST_BUFFER_SIZE (buf) < 12)
goto wrong_type;
data = GST_BUFFER_DATA (buf);
if (!HAVE_FOURCC (data, GST_RIFF_TAG_RIFF)) {
GST_ERROR_OBJECT (cdxa, "Not a RIFF file");
goto wrong_type;
}
if (!HAVE_FOURCC (data + 8, GST_RIFF_RIFF_CDXA)) {
GST_ERROR_OBJECT (cdxa, "RIFF file does not have CDXA content");
goto wrong_type;
}
cdxa->offset += 12;
gst_buffer_unref (buf);
return TRUE;
wrong_type:
GST_ELEMENT_ERROR (cdxa, STREAM, WRONG_TYPE, (NULL), (NULL));
gst_buffer_unref (buf);
return FALSE;
}
static gboolean
gst_cdxa_parse_sink_activate (GstPad * sinkpad)
{
GstCDXAParse *cdxa = GST_CDXA_PARSE (GST_PAD_PARENT (sinkpad));
if (!gst_pad_check_pull_range (sinkpad) ||
!gst_pad_activate_pull (sinkpad, TRUE)) {
GST_DEBUG_OBJECT (cdxa, "No pull mode");
return FALSE;
}
/* If we can activate pull_range upstream, then read the header
* and see if it's really a RIFF CDXA file. */
GST_DEBUG_OBJECT (cdxa, "Activated pull mode. Reading RIFF header");
if (!gst_cdxa_parse_stream_init (cdxa))
return FALSE;
return TRUE;
}
static gboolean
gst_cdxa_parse_sink_activate_pull (GstPad * sinkpad, gboolean active)
{
if (active) {
/* if we have a scheduler we can start the task */
gst_pad_start_task (sinkpad, (GstTaskFunction) gst_cdxa_parse_loop,
sinkpad);
} else {
gst_pad_stop_task (sinkpad);
}
return TRUE;
}
/*
* A sector is 2352 bytes long and is composed of:
*
* ! sync ! header ! subheader ! data ... ! edc !
* ! 12 bytes ! 4 bytes ! 8 bytes ! 2324 bytes ! 4 bytes !
* !-------------------------------------------------------!
*
* We strip the data out of it and send it to the srcpad.
*
* sync : 00 FF FF FF FF FF FF FF FF FF FF 00
* header : hour minute second mode
* sub-header : track channel sub_mode coding repeat (4 bytes)
* edc : checksum
*/
/* FIXME: use define from gstcdxastrip.h */
#define GST_CDXA_SECTOR_SIZE 2352
#define GST_CDXA_DATA_SIZE 2324
#define GST_CDXA_HEADER_SIZE 24
/* FIXME: use version from gstcdxastrip.c */
static GstBuffer *
gst_cdxa_parse_strip (GstBuffer * buf)
{
GstBuffer *sub;
g_assert (GST_BUFFER_SIZE (buf) >= GST_CDXA_SECTOR_SIZE);
/* Skip CDXA headers, only keep data.
* FIXME: check sync, resync, ... */
sub = gst_buffer_create_sub (buf, GST_CDXA_HEADER_SIZE, GST_CDXA_DATA_SIZE);
gst_buffer_unref (buf);
return sub;
}
/* -1 = no sync (discard buffer),
* otherwise offset indicates syncpoint in buffer.
*/
static gint
gst_cdxa_parse_sync (GstBuffer * buf)
{
const guint8 sync_marker[12] = { 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00
};
guint8 *data;
guint size;
size = GST_BUFFER_SIZE (buf);
data = GST_BUFFER_DATA (buf);
while (size >= 12) {
if (memcmp (data, sync_marker, 12) == 0) {
return (gint) (data - GST_BUFFER_DATA (buf));
}
--size;
++data;
}
return -1;
}
static void
gst_cdxa_parse_loop (GstPad * sinkpad)
{
GstFlowReturn flow_ret;
GstCDXAParse *cdxa;
GstBuffer *buf = NULL;
gint sync_offset = -1;
cdxa = GST_CDXA_PARSE (GST_PAD_PARENT (sinkpad));
if (cdxa->datasize <= 0) {
GstFormat format = GST_FORMAT_BYTES;
GstPad *peer;
if ((peer = gst_pad_get_peer (sinkpad))) {
if (!gst_pad_query_duration (peer, &format, &cdxa->datasize)) {
GST_DEBUG_OBJECT (cdxa, "Failed to query upstream size!");
gst_object_unref (peer);
goto pause;
}
gst_object_unref (peer);
}
GST_DEBUG_OBJECT (cdxa, "Upstream size: %" G_GINT64_FORMAT, cdxa->datasize);
}
do {
guint req;
req = 8 + GST_CDXA_SECTOR_SIZE; /* riff chunk header = 8 bytes */
flow_ret = gst_pad_pull_range (cdxa->sinkpad, cdxa->offset, req, &buf);
if (flow_ret != GST_FLOW_OK) {
GST_DEBUG_OBJECT (cdxa, "Pull flow: %s", gst_flow_get_name (flow_ret));
goto pause;
}
if (GST_BUFFER_SIZE (buf) < req) {
GST_DEBUG_OBJECT (cdxa, "Short read, only got %u/%u bytes",
GST_BUFFER_SIZE (buf), req);
goto eos;
}
sync_offset = gst_cdxa_parse_sync (buf);
gst_buffer_unref (buf);
buf = NULL;
if (sync_offset >= 0)
break;
cdxa->offset += req;
cdxa->bytes_skipped += req;
} while (1);
cdxa->offset += sync_offset;
cdxa->bytes_skipped += sync_offset;
/* first sync frame? */
if (cdxa->datastart < 0) {
GST_LOG_OBJECT (cdxa, "datastart=0x%" G_GINT64_MODIFIER "x", cdxa->offset);
cdxa->datastart = cdxa->offset;
cdxa->bytes_skipped = 0;
cdxa->bytes_sent = 0;
}
GST_DEBUG_OBJECT (cdxa, "pulling buffer at offset 0x%" G_GINT64_MODIFIER "x",
cdxa->offset);
flow_ret = gst_pad_pull_range (cdxa->sinkpad, cdxa->offset,
GST_CDXA_SECTOR_SIZE, &buf);
if (flow_ret != GST_FLOW_OK) {
GST_DEBUG_OBJECT (cdxa, "Flow: %s", gst_flow_get_name (flow_ret));
goto pause;
}
if (GST_BUFFER_SIZE (buf) < GST_CDXA_SECTOR_SIZE) {
GST_DEBUG_OBJECT (cdxa, "Short read, only got %u/%u bytes",
GST_BUFFER_SIZE (buf), GST_CDXA_SECTOR_SIZE);
goto eos;
}
buf = gst_cdxa_parse_strip (buf);
GST_DEBUG_OBJECT (cdxa, "pushing buffer %p", buf);
gst_buffer_set_caps (buf, GST_PAD_CAPS (cdxa->srcpad));
cdxa->offset += GST_BUFFER_SIZE (buf);
cdxa->bytes_sent += GST_BUFFER_SIZE (buf);
flow_ret = gst_pad_push (cdxa->srcpad, buf);
if (flow_ret != GST_FLOW_OK) {
GST_DEBUG_OBJECT (cdxa, "Push flow: %s", gst_flow_get_name (flow_ret));
goto pause;
}
return;
eos:
{
GST_DEBUG_OBJECT (cdxa, "Sending EOS");
if (buf)
gst_buffer_unref (buf);
buf = NULL;
gst_pad_push_event (cdxa->srcpad, gst_event_new_eos ());
/* fallthrough */
}
pause:
{
GST_DEBUG_OBJECT (cdxa, "Pausing");
gst_pad_pause_task (cdxa->sinkpad);
return;
}
}
static gint64
gst_cdxa_parse_convert_src_to_sink_offset (GstCDXAParse * cdxa, gint64 src)
{
gint64 sink;
sink = src + cdxa->datastart;
sink = gst_util_uint64_scale (sink, GST_CDXA_SECTOR_SIZE, GST_CDXA_DATA_SIZE);
/* FIXME: take into account skipped bytes */
GST_DEBUG_OBJECT (cdxa, "src offset=%" G_GINT64_FORMAT ", sink offset=%"
G_GINT64_FORMAT, src, sink);
return sink;
}
static gint64
gst_cdxa_parse_convert_sink_to_src_offset (GstCDXAParse * cdxa, gint64 sink)
{
gint64 src;
src = sink - cdxa->datastart;
src = gst_util_uint64_scale (src, GST_CDXA_DATA_SIZE, GST_CDXA_SECTOR_SIZE);
/* FIXME: take into account skipped bytes */
GST_DEBUG_OBJECT (cdxa, "sink offset=%" G_GINT64_FORMAT ", src offset=%"
G_GINT64_FORMAT, sink, src);
return src;
}
static gboolean
gst_cdxa_parse_do_seek (GstCDXAParse * cdxa, GstEvent * event)
{
GstSeekFlags flags;
GstSeekType start_type;
GstFormat format;
gint64 start, off, upstream_size;
gst_event_parse_seek (event, NULL, &format, &flags, &start_type, &start,
NULL, NULL);
if (format != GST_FORMAT_BYTES) {
GST_DEBUG_OBJECT (cdxa, "Can only handle seek in BYTES format");
return FALSE;
}
if (format != GST_SEEK_TYPE_SET) {
GST_DEBUG_OBJECT (cdxa, "Can only handle seek from start (SEEK_TYPE_SET)");
return FALSE;
}
GST_OBJECT_LOCK (cdxa);
off = gst_cdxa_parse_convert_src_to_sink_offset (cdxa, start);
upstream_size = cdxa->datasize;
GST_OBJECT_UNLOCK (cdxa);
if (off >= upstream_size) {
GST_DEBUG_OBJECT (cdxa, "Invalid target offset %" G_GINT64_FORMAT ", file "
"is only %" G_GINT64_FORMAT " bytes in size", off, upstream_size);
return FALSE;
}
/* unlock upstream pull_range */
gst_pad_push_event (cdxa->sinkpad, gst_event_new_flush_start ());
/* make sure our loop function exits */
gst_pad_push_event (cdxa->srcpad, gst_event_new_flush_start ());
/* wait for streaming to finish */
GST_PAD_STREAM_LOCK (cdxa->sinkpad);
/* prepare for streaming again */
gst_pad_push_event (cdxa->sinkpad, gst_event_new_flush_stop ());
gst_pad_push_event (cdxa->srcpad, gst_event_new_flush_stop ());
gst_pad_push_event (cdxa->srcpad,
gst_event_new_new_segment (FALSE, 1.0, GST_FORMAT_BYTES,
start, GST_CLOCK_TIME_NONE, 0));
GST_OBJECT_LOCK (cdxa);
cdxa->offset = off;
GST_OBJECT_UNLOCK (cdxa);
/* and restart */
gst_pad_start_task (cdxa->sinkpad,
(GstTaskFunction) gst_cdxa_parse_loop, cdxa->sinkpad);
GST_PAD_STREAM_UNLOCK (cdxa->sinkpad);
return TRUE;
}
static gboolean
gst_cdxa_parse_src_event (GstPad * srcpad, GstEvent * event)
{
GstCDXAParse *cdxa = GST_CDXA_PARSE (gst_pad_get_parent (srcpad));
gboolean res = FALSE;
GST_DEBUG_OBJECT (cdxa, "Handling %s event", GST_EVENT_TYPE_NAME (event));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEEK:
res = gst_cdxa_parse_do_seek (cdxa, event);
break;
default:
res = gst_pad_event_default (srcpad, event);
break;
}
gst_object_unref (cdxa);
return res;
}
static gboolean
gst_cdxa_parse_src_query (GstPad * srcpad, GstQuery * query)
{
GstCDXAParse *cdxa = GST_CDXA_PARSE (gst_pad_get_parent (srcpad));
gboolean res = FALSE;
GST_DEBUG_OBJECT (cdxa, "Handling %s query",
gst_query_type_get_name (GST_QUERY_TYPE (query)));
res = gst_pad_query_default (srcpad, query);
if (res) {
GstFormat format;
gint64 val;
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_DURATION:
gst_query_parse_duration (query, &format, &val);
if (format == GST_FORMAT_BYTES) {
val = gst_cdxa_parse_convert_sink_to_src_offset (cdxa, val);
gst_query_set_duration (query, format, val);
}
break;
case GST_QUERY_POSITION:
gst_query_parse_position (query, &format, &val);
if (format == GST_FORMAT_BYTES) {
val = gst_cdxa_parse_convert_sink_to_src_offset (cdxa, val);
gst_query_set_position (query, format, val);
}
break;
default:
break;
}
}
gst_object_unref (cdxa);
return res;
}
static GstStateChangeReturn
gst_cdxa_parse_change_state (GstElement * element, GstStateChange transition)
{
GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
GstCDXAParse *cdxa = GST_CDXA_PARSE (element);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
cdxa->state = GST_CDXA_PARSE_START;
break;
default:
break;
}
if (GST_ELEMENT_CLASS (parent_class)->change_state)
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
cdxa->state = GST_CDXA_PARSE_START;
cdxa->datasize = 0;
cdxa->datastart = -1;
break;
default:
break;
}
return ret;
}
static gboolean
plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (cdxaparse_debug, "cdxaparse", 0, "CDXA Parser");
GST_DEBUG_CATEGORY_INIT (vcdparse_debug, "vcdparse", 0, "VCD Parser");
if (!gst_element_register (plugin, "cdxaparse", GST_RANK_PRIMARY,
GST_TYPE_CDXA_PARSE))
return FALSE;
if (!gst_element_register (plugin, "vcdparse", GST_RANK_PRIMARY,
GST_TYPE_VCD_PARSE))
return FALSE;
return TRUE;
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"cdxaparse",
"Parse a .dat file (VCD) into raw mpeg1",
plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)
|