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Merge pull request #23 from jackaudio/device_reservation_fixes
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Device reservation fixes
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@sletz
sletz committed Nov 26, 2012
2 parents ce50e5b + b3394f4 commit e814e50
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Showing 6 changed files with 102 additions and 62 deletions.
3 changes: 3 additions & 0 deletions dbus/audio_reserve.c
View file
Expand Up @@ -76,6 +76,8 @@ SERVER_EXPORT bool audio_acquire(const char * device_name)

assert(gReserveCount < DEVICE_MAX);

dbus_error_init(&error);

if ((ret= rd_acquire(
&gReservedDevice[gReserveCount].reserved_device,
gConnection,
Expand All @@ -86,6 +88,7 @@ SERVER_EXPORT bool audio_acquire(const char * device_name)
&error)) < 0) {

jack_error("Failed to acquire device name : %s error : %s", device_name, (error.message ? error.message : strerror(-ret)));
dbus_error_free(&error);
return false;
}

Expand Down
3 changes: 3 additions & 0 deletions dbus/controller.c
View file
Expand Up @@ -377,6 +377,8 @@ on_device_acquire(const char * device_name)
int ret;
DBusError error;

dbus_error_init(&error);

ret = rd_acquire(
&g_reserved_device[g_device_count].reserved_device,
g_connection,
Expand All @@ -388,6 +390,7 @@ on_device_acquire(const char * device_name)
if (ret < 0)
{
jack_error("Failed to acquire device name : %s error : %s", device_name, (error.message ? error.message : strerror(-ret)));
dbus_error_free(&error);
return false;
}

Expand Down
80 changes: 62 additions & 18 deletions dbus/reserve.c
View file
Expand Up @@ -31,6 +31,11 @@
#include <stdint.h>

#include "reserve.h"
#include "jack/control.h"

#define RESERVE_ERROR_NO_MEMORY "org.freedesktop.ReserveDevice1.Error.NoMemory"
#define RESERVE_ERROR_PROTOCOL_VIOLATION "org.freedesktop.ReserveDevice1.Error.Protocol"
#define RESERVE_ERROR_RELEASE_DENIED "org.freedesktop.ReserveDevice1.Error.ReleaseDenied"

struct rd_device {
int ref;
Expand Down Expand Up @@ -371,34 +376,51 @@ int rd_acquire(
dbus_bool_t good;
vtable.message_function = object_handler;

if (!error)
if (!error) {
error = &_error;
dbus_error_init(error);
}

dbus_error_init(error);

if (!_d)
return -EINVAL;
if (!_d) {
assert(0);
r = -EINVAL;
goto fail;
}

if (!connection)
return -EINVAL;
if (!connection) {
assert(0);
r = -EINVAL;
goto fail;
}

if (!device_name)
return -EINVAL;
if (!device_name) {
assert(0);
r = -EINVAL;
goto fail;
}

if (!request_cb && priority != INT32_MAX)
return -EINVAL;
if (!request_cb && priority != INT32_MAX) {
assert(0);
r = -EINVAL;
goto fail;
}

if (!(d = (rd_device *)calloc(sizeof(rd_device), 1)))
return -ENOMEM;
if (!(d = (rd_device *)calloc(sizeof(rd_device), 1))) {
dbus_set_error(error, RESERVE_ERROR_NO_MEMORY, "Cannot allocate memory for rd_device struct");
r = -ENOMEM;
goto fail;
}

d->ref = 1;

if (!(d->device_name = strdup(device_name))) {
dbus_set_error(error, RESERVE_ERROR_NO_MEMORY, "Cannot duplicate device name string");
r = -ENOMEM;
goto fail;
}

if (!(d->application_name = strdup(application_name))) {
dbus_set_error(error, RESERVE_ERROR_NO_MEMORY, "Cannot duplicate application name string");
r = -ENOMEM;
goto fail;
}
Expand All @@ -408,12 +430,14 @@ int rd_acquire(
d->request_cb = request_cb;

if (!(d->service_name = (char*)malloc(sizeof(SERVICE_PREFIX) + strlen(device_name)))) {
dbus_set_error(error, RESERVE_ERROR_NO_MEMORY, "Cannot allocate memory for service name string");
r = -ENOMEM;
goto fail;
}
sprintf(d->service_name, SERVICE_PREFIX "%s", d->device_name);

if (!(d->object_path = (char*)malloc(sizeof(OBJECT_PREFIX) + strlen(device_name)))) {
dbus_set_error(error, RESERVE_ERROR_NO_MEMORY, "Cannot allocate memory for object path string");
r = -ENOMEM;
goto fail;
}
Expand All @@ -425,20 +449,28 @@ int rd_acquire(
DBUS_NAME_FLAG_DO_NOT_QUEUE|
(priority < INT32_MAX ? DBUS_NAME_FLAG_ALLOW_REPLACEMENT : 0),
error)) < 0) {
jack_error("dbus_bus_request_name() failed. (1)");
r = -EIO;
goto fail;
}

if (k == DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER || k == DBUS_REQUEST_NAME_REPLY_ALREADY_OWNER)
switch (k) {
case DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER:
case DBUS_REQUEST_NAME_REPLY_ALREADY_OWNER:
goto success;

if (k != DBUS_REQUEST_NAME_REPLY_EXISTS) {
case DBUS_REQUEST_NAME_REPLY_EXISTS:
break;
case DBUS_REQUEST_NAME_REPLY_IN_QUEUE : /* DBUS_NAME_FLAG_DO_NOT_QUEUE was specified */
default: /* unknown reply returned */
jack_error("request name reply with unexpected value %d.", k);
assert(0);
r = -EIO;
goto fail;
}

if (priority <= INT32_MIN) {
r = -EBUSY;
dbus_set_error(error, RESERVE_ERROR_RELEASE_DENIED, "Device reservation request with priority %"PRIi32" denied for \"%s\"", priority, device_name);
goto fail;
}

Expand All @@ -447,6 +479,7 @@ int rd_acquire(
d->object_path,
"org.freedesktop.ReserveDevice1",
"RequestRelease"))) {
dbus_set_error(error, RESERVE_ERROR_NO_MEMORY, "Cannot allocate memory for RequestRelease method call");
r = -ENOMEM;
goto fail;
}
Expand All @@ -455,6 +488,7 @@ int rd_acquire(
m,
DBUS_TYPE_INT32, &d->priority,
DBUS_TYPE_INVALID)) {
dbus_set_error(error, RESERVE_ERROR_NO_MEMORY, "Cannot append args for RequestRelease method call");
r = -ENOMEM;
goto fail;
}
Expand All @@ -469,10 +503,12 @@ int rd_acquire(
dbus_error_has_name(error, DBUS_ERROR_UNKNOWN_METHOD) ||
dbus_error_has_name(error, DBUS_ERROR_NO_REPLY)) {
/* This must be treated as denied. */
jack_info("Device reservation request with priority %"PRIi32" denied for \"%s\": %s (%s)", priority, device_name, error->name, error->message);
r = -EBUSY;
goto fail;
}

jack_error("dbus_connection_send_with_reply_and_block(RequestRelease) failed.");
r = -EIO;
goto fail;
}
Expand All @@ -482,11 +518,13 @@ int rd_acquire(
error,
DBUS_TYPE_BOOLEAN, &good,
DBUS_TYPE_INVALID)) {
jack_error("RequestRelease() reply is invalid.");
r = -EIO;
goto fail;
}

if (!good) {
dbus_set_error(error, RESERVE_ERROR_RELEASE_DENIED, "Device reservation request with priority %"PRIi32" denied for \"%s\" via RequestRelease()", priority, device_name);
r = -EBUSY;
goto fail;
}
Expand All @@ -498,23 +536,28 @@ int rd_acquire(
(priority < INT32_MAX ? DBUS_NAME_FLAG_ALLOW_REPLACEMENT : 0)|
DBUS_NAME_FLAG_REPLACE_EXISTING,
error)) < 0) {
jack_error("dbus_bus_request_name() failed. (2)");
r = -EIO;
goto fail;
}

if (k != DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER) {
/* this is racy, another contender may have acquired the device */
dbus_set_error(error, RESERVE_ERROR_PROTOCOL_VIOLATION, "request name reply is not DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER but %d.", k);
r = -EIO;
goto fail;
}

success:
d->owning = 1;

if (!(dbus_connection_register_object_path(
if (!(dbus_connection_try_register_object_path(
d->connection,
d->object_path,
&vtable,
d))) {
d,
error))) {
jack_error("cannot register object path \"%s\": %s", d->object_path, error->message);
r = -ENOMEM;
goto fail;
}
Expand All @@ -526,6 +569,7 @@ int rd_acquire(
filter_handler,
d,
NULL)) {
dbus_set_error(error, RESERVE_ERROR_NO_MEMORY, "Cannot add filter");
r = -ENOMEM;
goto fail;
}
Expand Down
54 changes: 30 additions & 24 deletions linux/alsa/JackAlsaDriver.cpp
View file
Expand Up @@ -31,7 +31,6 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#include <signal.h>
#include <sys/types.h>
#include <sys/time.h>
#include <regex.h>
#include <string.h>

#include "JackAlsaDriver.h"
Expand Down Expand Up @@ -172,30 +171,31 @@ int JackAlsaDriver::Detach()
return JackAudioDriver::Detach();
}

static char* get_control_device_name(const char * device_name)
extern "C" char* get_control_device_name(const char * device_name)
{
char * ctl_name;
regex_t expression;
const char * comma;

regcomp(&expression, "(plug)?hw:[0-9](,[0-9])?", REG_ICASE | REG_EXTENDED);
/* the user wants a hw or plughw device, the ctl name
* should be hw:x where x is the card identification.
* We skip the subdevice suffix that starts with comma */

if (!regexec(&expression, device_name, 0, NULL, 0)) {
/* the user wants a hw or plughw device, the ctl name
* should be hw:x where x is the card number */

char tmp[5];
strncpy(tmp, strstr(device_name, "hw"), 4);
tmp[4] = '\0';
jack_info("control device %s",tmp);
ctl_name = strdup(tmp);
} else {
ctl_name = strdup(device_name);
if (strncasecmp(device_name, "plughw:", 7) == 0) {
/* skip the "plug" prefix" */
device_name += 4;
}

regfree(&expression);

if (ctl_name == NULL) {
jack_error("strdup(\"%s\") failed.", ctl_name);
comma = strchr(device_name, ',');
if (comma == NULL) {
ctl_name = strdup(device_name);
if (ctl_name == NULL) {
jack_error("strdup(\"%s\") failed.", device_name);
}
} else {
ctl_name = strndup(device_name, comma - device_name);
if (ctl_name == NULL) {
jack_error("strndup(\"%s\", %u) failed.", device_name, (unsigned int)(comma - device_name));
}
}

return ctl_name;
Expand Down Expand Up @@ -278,16 +278,22 @@ int JackAlsaDriver::Open(jack_nframes_t nframes,
int playback_card = card_to_num(playback_driver_name);
char audio_name[32];

snprintf(audio_name, sizeof(audio_name), "Audio%d", capture_card);
if (!JackServerGlobals::on_device_acquire(audio_name)) {
jack_error("Audio device %s cannot be acquired...", capture_driver_name);
return -1;
if (capture_card >= 0) {
snprintf(audio_name, sizeof(audio_name), "Audio%d", capture_card);
if (!JackServerGlobals::on_device_acquire(audio_name)) {
jack_error("Audio device %s cannot be acquired...", capture_driver_name);
return -1;
}
}

if (playback_card != capture_card) {
if (playback_card >= 0 && playback_card != capture_card) {
snprintf(audio_name, sizeof(audio_name), "Audio%d", playback_card);
if (!JackServerGlobals::on_device_acquire(audio_name)) {
jack_error("Audio device %s cannot be acquired...", playback_driver_name);
if (capture_card >= 0) {
snprintf(audio_name, sizeof(audio_name), "Audio%d", capture_card);
JackServerGlobals::on_device_release(audio_name);
}
return -1;
}
}
Expand Down
4 changes: 1 addition & 3 deletions linux/alsa/JackAlsaDriver.h
View file
Expand Up @@ -39,15 +39,13 @@ class JackAlsaDriver : public JackAudioDriver
private:

jack_driver_t* fDriver;
int fReservedCaptureDevice;
int fReservedPlaybackDevice;

void UpdateLatencies();

public:

JackAlsaDriver(const char* name, const char* alias, JackLockedEngine* engine, JackSynchro* table)
: JackAudioDriver(name, alias, engine, table),fDriver(NULL),fReservedCaptureDevice(-1),fReservedPlaybackDevice(-1)
: JackAudioDriver(name, alias, engine, table),fDriver(NULL)
{}
virtual ~JackAlsaDriver()
{}
Expand Down
20 changes: 3 additions & 17 deletions linux/alsa/alsa_driver.c
View file
Expand Up @@ -32,7 +32,6 @@
#include <signal.h>
#include <sys/types.h>
#include <sys/time.h>
#include <regex.h>
#include <string.h>

#include "alsa_driver.h"
Expand Down Expand Up @@ -137,30 +136,18 @@ alsa_driver_check_capabilities (alsa_driver_t *driver)
return 0;
}

char* get_control_device_name(const char * device_name);

static int
alsa_driver_check_card_type (alsa_driver_t *driver)
{
int err;
snd_ctl_card_info_t *card_info;
char * ctl_name;
regex_t expression;

snd_ctl_card_info_alloca (&card_info);

regcomp(&expression,"(plug)?hw:[0-9](,[0-9])?",REG_ICASE|REG_EXTENDED);

if (!regexec(&expression,driver->alsa_name_playback,0,NULL,0)) {
/* the user wants a hw or plughw device, the ctl name
* should be hw:x where x is the card number */

char tmp[5];
strncpy(tmp,strcasestr(driver->alsa_name_playback,"hw"),4);
tmp[4]='\0';
jack_info("control device %s",tmp);
ctl_name = strdup(tmp);
} else {
ctl_name = strdup(driver->alsa_name_playback);
}
ctl_name = get_control_device_name(driver->alsa_name_playback);

// XXX: I don't know the "right" way to do this. Which to use
// driver->alsa_name_playback or driver->alsa_name_capture.
Expand All @@ -175,7 +162,6 @@ alsa_driver_check_card_type (alsa_driver_t *driver)

driver->alsa_driver = strdup(snd_ctl_card_info_get_driver (card_info));

regfree(&expression);
free(ctl_name);

return alsa_driver_check_capabilities (driver);
Expand Down

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