[mirror_ubuntu-artful-kernel.git] / drivers / media / video / pvrusb2 / pvrusb2-context.c

/*
 *  $Id$
 *
 *  Copyright (C) 2005 Mike Isely <isely@pobox.com>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License
 *
 *  This program 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include "pvrusb2-context.h"
#include "pvrusb2-io.h"
#include "pvrusb2-ioread.h"
#include "pvrusb2-hdw.h"
#include "pvrusb2-debug.h"
#include <linux/wait.h>
#include <linux/kthread.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/slab.h>

static struct pvr2_context *pvr2_context_exist_first;
static struct pvr2_context *pvr2_context_exist_last;
static struct pvr2_context *pvr2_context_notify_first;
static struct pvr2_context *pvr2_context_notify_last;
static DEFINE_MUTEX(pvr2_context_mutex);
static DECLARE_WAIT_QUEUE_HEAD(pvr2_context_sync_data);
static DECLARE_WAIT_QUEUE_HEAD(pvr2_context_cleanup_data);
static int pvr2_context_cleanup_flag;
static int pvr2_context_cleaned_flag;
static struct task_struct *pvr2_context_thread_ptr;


static void pvr2_context_set_notify(struct pvr2_context *mp, int fl)
{
	int signal_flag = 0;
	mutex_lock(&pvr2_context_mutex);
	if (fl) {
		if (!mp->notify_flag) {
			signal_flag = (pvr2_context_notify_first == NULL);
			mp->notify_prev = pvr2_context_notify_last;
			mp->notify_next = NULL;
			pvr2_context_notify_last = mp;
			if (mp->notify_prev) {
				mp->notify_prev->notify_next = mp;
			} else {
				pvr2_context_notify_first = mp;
			}
			mp->notify_flag = !0;
		}
	} else {
		if (mp->notify_flag) {
			mp->notify_flag = 0;
			if (mp->notify_next) {
				mp->notify_next->notify_prev = mp->notify_prev;
			} else {
				pvr2_context_notify_last = mp->notify_prev;
			}
			if (mp->notify_prev) {
				mp->notify_prev->notify_next = mp->notify_next;
			} else {
				pvr2_context_notify_first = mp->notify_next;
			}
		}
	}
	mutex_unlock(&pvr2_context_mutex);
	if (signal_flag) wake_up(&pvr2_context_sync_data);
}


static void pvr2_context_destroy(struct pvr2_context *mp)
{
	pvr2_trace(PVR2_TRACE_CTXT,"pvr2_context %p (destroy)",mp);
	if (mp->hdw) pvr2_hdw_destroy(mp->hdw);
	pvr2_context_set_notify(mp, 0);
	mutex_lock(&pvr2_context_mutex);
	if (mp->exist_next) {
		mp->exist_next->exist_prev = mp->exist_prev;
	} else {
		pvr2_context_exist_last = mp->exist_prev;
	}
	if (mp->exist_prev) {
		mp->exist_prev->exist_next = mp->exist_next;
	} else {
		pvr2_context_exist_first = mp->exist_next;
	}
	if (!pvr2_context_exist_first) {
		/* Trigger wakeup on control thread in case it is waiting
		   for an exit condition. */
		wake_up(&pvr2_context_sync_data);
	}
	mutex_unlock(&pvr2_context_mutex);
	kfree(mp);
}


static void pvr2_context_notify(struct pvr2_context *mp)
{
	pvr2_context_set_notify(mp,!0);
}


static void pvr2_context_check(struct pvr2_context *mp)
{
	struct pvr2_channel *ch1, *ch2;
	pvr2_trace(PVR2_TRACE_CTXT,
		   "pvr2_context %p (notify)", mp);
	if (!mp->initialized_flag && !mp->disconnect_flag) {
		mp->initialized_flag = !0;
		pvr2_trace(PVR2_TRACE_CTXT,
			   "pvr2_context %p (initialize)", mp);
		/* Finish hardware initialization */
		if (pvr2_hdw_initialize(mp->hdw,
					(void (*)(void *))pvr2_context_notify,
					mp)) {
			mp->video_stream.stream =
				pvr2_hdw_get_video_stream(mp->hdw);
			/* Trigger interface initialization.  By doing this
			   here initialization runs in our own safe and
			   cozy thread context. */
			if (mp->setup_func) mp->setup_func(mp);
		} else {
			pvr2_trace(PVR2_TRACE_CTXT,
				   "pvr2_context %p (thread skipping setup)",
				   mp);
			/* Even though initialization did not succeed,
			   we're still going to continue anyway.  We need
			   to do this in order to await the expected
			   disconnect (which we will detect in the normal
			   course of operation). */
		}
	}

	for (ch1 = mp->mc_first; ch1; ch1 = ch2) {
		ch2 = ch1->mc_next;
		if (ch1->check_func) ch1->check_func(ch1);
	}

	if (mp->disconnect_flag && !mp->mc_first) {
		/* Go away... */
		pvr2_context_destroy(mp);
		return;
	}
}


static int pvr2_context_shutok(void)
{
	return pvr2_context_cleanup_flag && (pvr2_context_exist_first == NULL);
}


static int pvr2_context_thread_func(void *foo)
{
	struct pvr2_context *mp;

	pvr2_trace(PVR2_TRACE_CTXT,"pvr2_context thread start");

	do {
		while ((mp = pvr2_context_notify_first) != NULL) {
			pvr2_context_set_notify(mp, 0);
			pvr2_context_check(mp);
		}
		wait_event_interruptible(
			pvr2_context_sync_data,
			((pvr2_context_notify_first != NULL) ||
			 pvr2_context_shutok()));
	} while (!pvr2_context_shutok());

	pvr2_context_cleaned_flag = !0;
	wake_up(&pvr2_context_cleanup_data);

	pvr2_trace(PVR2_TRACE_CTXT,"pvr2_context thread cleaned up");

	wait_event_interruptible(
		pvr2_context_sync_data,
		kthread_should_stop());

	pvr2_trace(PVR2_TRACE_CTXT,"pvr2_context thread end");

	return 0;
}


int pvr2_context_global_init(void)
{
	pvr2_context_thread_ptr = kthread_run(pvr2_context_thread_func,
					      0,
					      "pvrusb2-context");
	return (pvr2_context_thread_ptr ? 0 : -ENOMEM);
}


void pvr2_context_global_done(void)
{
	pvr2_context_cleanup_flag = !0;
	wake_up(&pvr2_context_sync_data);
	wait_event_interruptible(
		pvr2_context_cleanup_data,
		pvr2_context_cleaned_flag);
	kthread_stop(pvr2_context_thread_ptr);
}


struct pvr2_context *pvr2_context_create(
	struct usb_interface *intf,
	const struct usb_device_id *devid,
	void (*setup_func)(struct pvr2_context *))
{
	struct pvr2_context *mp = NULL;
	mp = kzalloc(sizeof(*mp),GFP_KERNEL);
	if (!mp) goto done;
	pvr2_trace(PVR2_TRACE_CTXT,"pvr2_context %p (create)",mp);
	mp->setup_func = setup_func;
	mutex_init(&mp->mutex);
	mutex_lock(&pvr2_context_mutex);
	mp->exist_prev = pvr2_context_exist_last;
	mp->exist_next = NULL;
	pvr2_context_exist_last = mp;
	if (mp->exist_prev) {
		mp->exist_prev->exist_next = mp;
	} else {
		pvr2_context_exist_first = mp;
	}
	mutex_unlock(&pvr2_context_mutex);
	mp->hdw = pvr2_hdw_create(intf,devid);
	if (!mp->hdw) {
		pvr2_context_destroy(mp);
		mp = NULL;
		goto done;
	}
	pvr2_context_set_notify(mp, !0);
 done:
	return mp;
}


static void pvr2_context_enter(struct pvr2_context *mp)
{
	mutex_lock(&mp->mutex);
}


static void pvr2_context_exit(struct pvr2_context *mp)
{
	int destroy_flag = 0;
	if (!(mp->mc_first || !mp->disconnect_flag)) {
		destroy_flag = !0;
	}
	mutex_unlock(&mp->mutex);
	if (destroy_flag) pvr2_context_notify(mp);
}


void pvr2_context_disconnect(struct pvr2_context *mp)
{
	pvr2_hdw_disconnect(mp->hdw);
	mp->disconnect_flag = !0;
	pvr2_context_notify(mp);
}


void pvr2_channel_init(struct pvr2_channel *cp,struct pvr2_context *mp)
{
	pvr2_context_enter(mp);
	cp->hdw = mp->hdw;
	cp->mc_head = mp;
	cp->mc_next = NULL;
	cp->mc_prev = mp->mc_last;
	if (mp->mc_last) {
		mp->mc_last->mc_next = cp;
	} else {
		mp->mc_first = cp;
	}
	mp->mc_last = cp;
	pvr2_context_exit(mp);
}


static void pvr2_channel_disclaim_stream(struct pvr2_channel *cp)
{
	if (!cp->stream) return;
	pvr2_stream_kill(cp->stream->stream);
	cp->stream->user = NULL;
	cp->stream = NULL;
}


void pvr2_channel_done(struct pvr2_channel *cp)
{
	struct pvr2_context *mp = cp->mc_head;
	pvr2_context_enter(mp);
	pvr2_channel_disclaim_stream(cp);
	if (cp->mc_next) {
		cp->mc_next->mc_prev = cp->mc_prev;
	} else {
		mp->mc_last = cp->mc_prev;
	}
	if (cp->mc_prev) {
		cp->mc_prev->mc_next = cp->mc_next;
	} else {
		mp->mc_first = cp->mc_next;
	}
	cp->hdw = NULL;
	pvr2_context_exit(mp);
}


int pvr2_channel_claim_stream(struct pvr2_channel *cp,
			      struct pvr2_context_stream *sp)
{
	int code = 0;
	pvr2_context_enter(cp->mc_head); do {
		if (sp == cp->stream) break;
		if (sp && sp->user) {
			code = -EBUSY;
			break;
		}
		pvr2_channel_disclaim_stream(cp);
		if (!sp) break;
		sp->user = cp;
		cp->stream = sp;
	} while (0); pvr2_context_exit(cp->mc_head);
	return code;
}


// This is the marker for the real beginning of a legitimate mpeg2 stream.
static char stream_sync_key[] = {
	0x00, 0x00, 0x01, 0xba,
};

struct pvr2_ioread *pvr2_channel_create_mpeg_stream(
	struct pvr2_context_stream *sp)
{
	struct pvr2_ioread *cp;
	cp = pvr2_ioread_create();
	if (!cp) return NULL;
	pvr2_ioread_setup(cp,sp->stream);
	pvr2_ioread_set_sync_key(cp,stream_sync_key,sizeof(stream_sync_key));
	return cp;
}


/*
  Stuff for Emacs to see, in order to encourage consistent editing style:
  *** Local Variables: ***
  *** mode: c ***
  *** fill-column: 75 ***
  *** tab-width: 8 ***
  *** c-basic-offset: 8 ***
  *** End: ***
  */
Commit	Line	Data
d855497e MI	1	/*
	2	* $Id$
	3	*
	4	* Copyright (C) 2005 Mike Isely <isely@pobox.com>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this program; if not, write to the Free Software
	17	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	18	*
	19	*/
	20
	21	#include "pvrusb2-context.h"
	22	#include "pvrusb2-io.h"
	23	#include "pvrusb2-ioread.h"
	24	#include "pvrusb2-hdw.h"
	25	#include "pvrusb2-debug.h"
e5be15c6	26	#include <linux/wait.h>
794b1607	27	#include <linux/kthread.h>
d855497e MI	28	#include <linux/errno.h>
	29	#include <linux/string.h>
	30	#include <linux/slab.h>
d855497e	31
e5be15c6 MI	32	static struct pvr2_context *pvr2_context_exist_first;
	33	static struct pvr2_context *pvr2_context_exist_last;
	34	static struct pvr2_context *pvr2_context_notify_first;
	35	static struct pvr2_context *pvr2_context_notify_last;
	36	static DEFINE_MUTEX(pvr2_context_mutex);
	37	static DECLARE_WAIT_QUEUE_HEAD(pvr2_context_sync_data);
18ecbb47 MI	38	static DECLARE_WAIT_QUEUE_HEAD(pvr2_context_cleanup_data);
	39	static int pvr2_context_cleanup_flag;
	40	static int pvr2_context_cleaned_flag;
e5be15c6 MI	41	static struct task_struct *pvr2_context_thread_ptr;
	42
	43
	44	static void pvr2_context_set_notify(struct pvr2_context *mp, int fl)
	45	{
	46	int signal_flag = 0;
	47	mutex_lock(&pvr2_context_mutex);
	48	if (fl) {
	49	if (!mp->notify_flag) {
	50	signal_flag = (pvr2_context_notify_first == NULL);
	51	mp->notify_prev = pvr2_context_notify_last;
	52	mp->notify_next = NULL;
	53	pvr2_context_notify_last = mp;
	54	if (mp->notify_prev) {
	55	mp->notify_prev->notify_next = mp;
	56	} else {
	57	pvr2_context_notify_first = mp;
	58	}
	59	mp->notify_flag = !0;
	60	}
	61	} else {
	62	if (mp->notify_flag) {
	63	mp->notify_flag = 0;
	64	if (mp->notify_next) {
	65	mp->notify_next->notify_prev = mp->notify_prev;
	66	} else {
	67	pvr2_context_notify_last = mp->notify_prev;
	68	}
	69	if (mp->notify_prev) {
	70	mp->notify_prev->notify_next = mp->notify_next;
	71	} else {
	72	pvr2_context_notify_first = mp->notify_next;
	73	}
	74	}
	75	}
	76	mutex_unlock(&pvr2_context_mutex);
	77	if (signal_flag) wake_up(&pvr2_context_sync_data);
	78	}
	79
d855497e MI	80
	81	static void pvr2_context_destroy(struct pvr2_context *mp)
	82	{
794b1607	83	pvr2_trace(PVR2_TRACE_CTXT,"pvr2_context %p (destroy)",mp);
681c7399	84	if (mp->hdw) pvr2_hdw_destroy(mp->hdw);
e5be15c6 MI	85	pvr2_context_set_notify(mp, 0);
	86	mutex_lock(&pvr2_context_mutex);
	87	if (mp->exist_next) {
	88	mp->exist_next->exist_prev = mp->exist_prev;
	89	} else {
	90	pvr2_context_exist_last = mp->exist_prev;
	91	}
	92	if (mp->exist_prev) {
	93	mp->exist_prev->exist_next = mp->exist_next;
	94	} else {
	95	pvr2_context_exist_first = mp->exist_next;
	96	}
	97	if (!pvr2_context_exist_first) {
	98	/* Trigger wakeup on control thread in case it is waiting
	99	for an exit condition. */
	100	wake_up(&pvr2_context_sync_data);
	101	}
	102	mutex_unlock(&pvr2_context_mutex);
d855497e MI	103	kfree(mp);
	104	}
	105
	106
794b1607	107	static void pvr2_context_notify(struct pvr2_context *mp)
d855497e	108	{
e5be15c6	109	pvr2_context_set_notify(mp,!0);
794b1607 MI	110	}
	111
	112
e5be15c6	113	static void pvr2_context_check(struct pvr2_context *mp)
794b1607	114	{
e5be15c6 MI	115	struct pvr2_channel ch1, ch2;
	116	pvr2_trace(PVR2_TRACE_CTXT,
	117	"pvr2_context %p (notify)", mp);
	118	if (!mp->initialized_flag && !mp->disconnect_flag) {
	119	mp->initialized_flag = !0;
794b1607	120	pvr2_trace(PVR2_TRACE_CTXT,
e5be15c6 MI	121	"pvr2_context %p (initialize)", mp);
	122	/* Finish hardware initialization */
	123	if (pvr2_hdw_initialize(mp->hdw,
	124	(void ()(void ))pvr2_context_notify,
	125	mp)) {
	126	mp->video_stream.stream =
	127	pvr2_hdw_get_video_stream(mp->hdw);
	128	/* Trigger interface initialization. By doing this
	129	here initialization runs in our own safe and
	130	cozy thread context. */
	131	if (mp->setup_func) mp->setup_func(mp);
	132	} else {
794b1607	133	pvr2_trace(PVR2_TRACE_CTXT,
e5be15c6 MI	134	"pvr2_context %p (thread skipping setup)",
	135	mp);
	136	/* Even though initialization did not succeed,
	137	we're still going to continue anyway. We need
	138	to do this in order to await the expected
	139	disconnect (which we will detect in the normal
	140	course of operation). */
d855497e	141	}
794b1607	142	}
e5be15c6 MI	143
	144	for (ch1 = mp->mc_first; ch1; ch1 = ch2) {
	145	ch2 = ch1->mc_next;
	146	if (ch1->check_func) ch1->check_func(ch1);
	147	}
	148
	149	if (mp->disconnect_flag && !mp->mc_first) {
	150	/* Go away... */
	151	pvr2_context_destroy(mp);
	152	return;
	153	}
	154	}
	155
	156
	157	static int pvr2_context_shutok(void)
	158	{
18ecbb47	159	return pvr2_context_cleanup_flag && (pvr2_context_exist_first == NULL);
e5be15c6 MI	160	}
	161
	162
	163	static int pvr2_context_thread_func(void *foo)
	164	{
	165	struct pvr2_context *mp;
	166
	167	pvr2_trace(PVR2_TRACE_CTXT,"pvr2_context thread start");
	168
	169	do {
	170	while ((mp = pvr2_context_notify_first) != NULL) {
	171	pvr2_context_set_notify(mp, 0);
	172	pvr2_context_check(mp);
	173	}
	174	wait_event_interruptible(
	175	pvr2_context_sync_data,
	176	((pvr2_context_notify_first != NULL) \|\|
	177	pvr2_context_shutok()));
	178	} while (!pvr2_context_shutok());
	179
18ecbb47 MI	180	pvr2_context_cleaned_flag = !0;
	181	wake_up(&pvr2_context_cleanup_data);
	182
	183	pvr2_trace(PVR2_TRACE_CTXT,"pvr2_context thread cleaned up");
	184
	185	wait_event_interruptible(
	186	pvr2_context_sync_data,
	187	kthread_should_stop());
	188
e5be15c6 MI	189	pvr2_trace(PVR2_TRACE_CTXT,"pvr2_context thread end");
e5be15c6 MI	190
794b1607 MI	191	return 0;
794b1607 MI	192	}
d855497e MI	193
d855497e MI	194
e5be15c6 MI	195	int pvr2_context_global_init(void)
	196	{
	197	pvr2_context_thread_ptr = kthread_run(pvr2_context_thread_func,
	198	0,
	199	"pvrusb2-context");
	200	return (pvr2_context_thread_ptr ? 0 : -ENOMEM);
	201	}
	202
	203
	204	void pvr2_context_global_done(void)
	205	{
18ecbb47 MI	206	pvr2_context_cleanup_flag = !0;
	207	wake_up(&pvr2_context_sync_data);
	208	wait_event_interruptible(
	209	pvr2_context_cleanup_data,
	210	pvr2_context_cleaned_flag);
e5be15c6 MI	211	kthread_stop(pvr2_context_thread_ptr);
	212	}
	213
	214
d855497e MI	215	struct pvr2_context *pvr2_context_create(
	216	struct usb_interface *intf,
	217	const struct usb_device_id *devid,
	218	void (setup_func)(struct pvr2_context ))
	219	{
a0fd1cb1	220	struct pvr2_context *mp = NULL;
ca545f7c	221	mp = kzalloc(sizeof(*mp),GFP_KERNEL);
d855497e	222	if (!mp) goto done;
794b1607	223	pvr2_trace(PVR2_TRACE_CTXT,"pvr2_context %p (create)",mp);
d855497e MI	224	mp->setup_func = setup_func;
d855497e MI	225	mutex_init(&mp->mutex);
e5be15c6 MI	226	mutex_lock(&pvr2_context_mutex);
	227	mp->exist_prev = pvr2_context_exist_last;
	228	mp->exist_next = NULL;
	229	pvr2_context_exist_last = mp;
	230	if (mp->exist_prev) {
	231	mp->exist_prev->exist_next = mp;
	232	} else {
	233	pvr2_context_exist_first = mp;
	234	}
	235	mutex_unlock(&pvr2_context_mutex);
d855497e MI	236	mp->hdw = pvr2_hdw_create(intf,devid);
	237	if (!mp->hdw) {
	238	pvr2_context_destroy(mp);
a0fd1cb1	239	mp = NULL;
d855497e MI	240	goto done;
d855497e MI	241	}
e5be15c6	242	pvr2_context_set_notify(mp, !0);
d855497e MI	243	done:
	244	return mp;
	245	}
	246
	247
794b1607	248	static void pvr2_context_enter(struct pvr2_context *mp)
d855497e MI	249	{
d855497e MI	250	mutex_lock(&mp->mutex);
d855497e MI	251	}
	252
	253
794b1607	254	static void pvr2_context_exit(struct pvr2_context *mp)
d855497e MI	255	{
	256	int destroy_flag = 0;
	257	if (!(mp->mc_first \|\| !mp->disconnect_flag)) {
	258	destroy_flag = !0;
	259	}
d855497e	260	mutex_unlock(&mp->mutex);
794b1607	261	if (destroy_flag) pvr2_context_notify(mp);
d855497e MI	262	}
	263
	264
	265	void pvr2_context_disconnect(struct pvr2_context *mp)
	266	{
794b1607 MI	267	pvr2_hdw_disconnect(mp->hdw);
	268	mp->disconnect_flag = !0;
	269	pvr2_context_notify(mp);
d855497e MI	270	}
	271
	272
	273	void pvr2_channel_init(struct pvr2_channel cp,struct pvr2_context mp)
	274	{
794b1607	275	pvr2_context_enter(mp);
d855497e MI	276	cp->hdw = mp->hdw;
d855497e MI	277	cp->mc_head = mp;
a0fd1cb1	278	cp->mc_next = NULL;
d855497e MI	279	cp->mc_prev = mp->mc_last;
	280	if (mp->mc_last) {
	281	mp->mc_last->mc_next = cp;
	282	} else {
	283	mp->mc_first = cp;
	284	}
	285	mp->mc_last = cp;
794b1607	286	pvr2_context_exit(mp);
d855497e MI	287	}
	288
	289
	290	static void pvr2_channel_disclaim_stream(struct pvr2_channel *cp)
	291	{
	292	if (!cp->stream) return;
	293	pvr2_stream_kill(cp->stream->stream);
a0fd1cb1 MI	294	cp->stream->user = NULL;
a0fd1cb1 MI	295	cp->stream = NULL;
d855497e MI	296	}
	297
	298
	299	void pvr2_channel_done(struct pvr2_channel *cp)
	300	{
	301	struct pvr2_context *mp = cp->mc_head;
794b1607	302	pvr2_context_enter(mp);
d855497e MI	303	pvr2_channel_disclaim_stream(cp);
	304	if (cp->mc_next) {
	305	cp->mc_next->mc_prev = cp->mc_prev;
	306	} else {
	307	mp->mc_last = cp->mc_prev;
	308	}
	309	if (cp->mc_prev) {
	310	cp->mc_prev->mc_next = cp->mc_next;
	311	} else {
	312	mp->mc_first = cp->mc_next;
	313	}
a0fd1cb1	314	cp->hdw = NULL;
794b1607	315	pvr2_context_exit(mp);
d855497e MI	316	}
	317
	318
	319	int pvr2_channel_claim_stream(struct pvr2_channel *cp,
	320	struct pvr2_context_stream *sp)
	321	{
	322	int code = 0;
	323	pvr2_context_enter(cp->mc_head); do {
	324	if (sp == cp->stream) break;
99a6acf9	325	if (sp && sp->user) {
d855497e MI	326	code = -EBUSY;
	327	break;
	328	}
	329	pvr2_channel_disclaim_stream(cp);
	330	if (!sp) break;
	331	sp->user = cp;
	332	cp->stream = sp;
	333	} while (0); pvr2_context_exit(cp->mc_head);
	334	return code;
	335	}
	336
	337
	338	// This is the marker for the real beginning of a legitimate mpeg2 stream.
	339	static char stream_sync_key[] = {
	340	0x00, 0x00, 0x01, 0xba,
	341	};
	342
	343	struct pvr2_ioread *pvr2_channel_create_mpeg_stream(
	344	struct pvr2_context_stream *sp)
	345	{
	346	struct pvr2_ioread *cp;
	347	cp = pvr2_ioread_create();
a0fd1cb1	348	if (!cp) return NULL;
d855497e MI	349	pvr2_ioread_setup(cp,sp->stream);
	350	pvr2_ioread_set_sync_key(cp,stream_sync_key,sizeof(stream_sync_key));
	351	return cp;
	352	}
	353
	354
	355	/*
	356	Stuff for Emacs to see, in order to encourage consistent editing style:
	357	* Local Variables: *
	358	* mode: c *
	359	* fill-column: 75 *
	360	* tab-width: 8 *
	361	* c-basic-offset: 8 *
	362	* End: *
	363	*/