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Alsa: fix crash when detecting devices.

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Some old versions of Alsa crash when snd_device_name_hint(-1, ...) is
called. This patch works around the problem by iterating manually over all
the available sound cards.

Change-Id: Ic380a371acc15013d137553ff30d68bed5af664e
Reviewed-by: Christian Stromme <christian.stromme@digia.com>
This commit is contained in:
Yoann Lopes
2014-01-30 16:32:53 +01:00
committed by The Qt Project
parent 67b86a9fbd
commit 0ab81ef59f
2 changed files with 80 additions and 72 deletions
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15
src/gsttools/qgstreameraudioinputselector.cpp
View File

@@ -119,12 +119,13 @@ void QGstreamerAudioInputSelector::updateAlsaDevices()
{
#ifdef HAVE_ALSA
void **hints, **n;
if (snd_device_name_hint(-1, "pcm", &hints) < 0) {
qWarning()<<"no alsa devices available";
return;
}
n = hints;
int card = -1;
while (snd_card_next(&card) == 0 && card >= 0) {
if (snd_device_name_hint(card, "pcm", &hints) < 0)
continue;
n = hints;
while (*n != NULL) {
char *name = snd_device_name_get_hint(*n, "NAME");
char *descr = snd_device_name_get_hint(*n, "DESC");
@@ -143,9 +144,11 @@ void QGstreamerAudioInputSelector::updateAlsaDevices()
free(descr);
if (io != NULL)
free(io);
n++;
++n;
}
snd_device_name_free_hint(hints);
}
#endif
}

29
src/multimedia/audio/qaudiodeviceinfo_alsa_p.cpp
View File

@@ -345,14 +345,9 @@ QList<QByteArray> QAudioDeviceInfoInternal::availableDevices(QAudio::Mode mode)
#if(SND_LIB_MAJOR == 1 && SND_LIB_MINOR == 0 && SND_LIB_SUBMINOR >= 14)
// Create a list of all current audio devices that support mode
void **hints, **n;
void **hints;
char *name, *descr, *io;
if(snd_device_name_hint(-1, "pcm", &hints) < 0) {
qWarning() << "no alsa devices available";
return devices;
}
n = hints;
int card = -1;
if(mode == QAudio::AudioInput) {
filter = "Input";
@@ -360,6 +355,11 @@ QList<QByteArray> QAudioDeviceInfoInternal::availableDevices(QAudio::Mode mode)
filter = "Output";
}
while (snd_card_next(&card) == 0 && card >= 0) {
if (snd_device_name_hint(card, "pcm", &hints) < 0)
continue;
void **n = hints;
while (*n != NULL) {
name = snd_device_name_get_hint(*n, "NAME");
if (name != 0 && qstrcmp(name, "null") != 0) {
@@ -381,7 +381,9 @@ QList<QByteArray> QAudioDeviceInfoInternal::availableDevices(QAudio::Mode mode)
free(name);
++n;
}
snd_device_name_free_hint(hints);
}
#else
int idx = 0;
char* name;
@@ -422,14 +424,15 @@ void QAudioDeviceInfoInternal::checkSurround()
surround51 = false;
surround71 = false;
void **hints, **n;
void **hints;
char *name, *descr, *io;
int card = -1;
if(snd_device_name_hint(-1, "pcm", &hints) < 0)
return;
n = hints;
while (snd_card_next(&card) == 0 && card >= 0) {
if (snd_device_name_hint(card, "pcm", &hints) < 0)
continue;
void **n = hints;
while (*n != NULL) {
name = snd_device_name_get_hint(*n, "NAME");
descr = snd_device_name_get_hint(*n, "DESC");
@@ -453,7 +456,9 @@ void QAudioDeviceInfoInternal::checkSurround()
free(io);
++n;
}
snd_device_name_free_hint(hints);
}
}
QT_END_NAMESPACE