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tests/qtest/ac97-test: add up-/downsampling tests

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Test if the audio subsystem can handle extreme up- and down-
sampling ratios like 44100/1 and 1/44100. For some time these
used to trigger QEMU aborts. The test was taken from
https://gitlab.com/qemu-project/qemu/-/issues/71 where it was
used to demonstrate a very different issue.

Suggested-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Volker Rümelin <vr_qemu@t-online.de>
Message-Id: <20230520113313.5177-1-vr_qemu@t-online.de>
Signed-off-by: Thomas Huth <thuth@redhat.com>
This commit is contained in:
Volker Rümelin 2023-05-20 13:33:13 +02:00 committed by Thomas Huth
parent 5af3438a7c
commit 031616cd75
1 changed files with 39 additions and 1 deletions
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40
tests/qtest/ac97-test.c
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@ -42,16 +42,54 @@ static void *ac97_create(void *pci_bus, QGuestAllocator *alloc, void *addr)
return &ac97->obj;
}
/*
* This is rather a test of the audio subsystem and not an AC97 test. Test if
* the audio subsystem can handle a 44100/1 upsample ratio. For some time this
* used to trigger QEMU aborts.
*/
static void ac97_playback_upsample(void *obj, void *data, QGuestAllocator *alloc)
{
QAC97 *ac97 = obj;
QPCIDevice *dev = &ac97->dev;
QPCIBar bar0;
qpci_device_enable(dev);
bar0 = qpci_iomap(dev, 0, NULL);
/* IOBAR0 offset 0x2c: PCM Front DAC Rate */
qpci_io_writew(dev, bar0, 0x2c, 0x1);
}
/*
* This test is similar to the playback upsample test. QEMU shouldn't abort if
* asked for a 1/44100 downsample ratio.
*/
static void ac97_record_downsample(void *obj, void *data, QGuestAllocator *alloc)
{
QAC97 *ac97 = obj;
QPCIDevice *dev = &ac97->dev;
QPCIBar bar0;
qpci_device_enable(dev);
bar0 = qpci_iomap(dev, 0, NULL);
/* IOBAR0 offset 0x32: PCM L/R ADC Rate */
qpci_io_writew(dev, bar0, 0x32, 0x1);
}
static void ac97_register_nodes(void)
{
QOSGraphEdgeOptions opts = {
.extra_device_opts = "addr=04.0",
.extra_device_opts = "addr=04.0,audiodev=snd0",
.after_cmd_line = "-audiodev none,id=snd0"
",out.frequency=44100,in.frequency=44100",
};
add_qpci_address(&opts, &(QPCIAddress) { .devfn = QPCI_DEVFN(4, 0) });
qos_node_create_driver("AC97", ac97_create);
qos_node_produces("AC97", "pci-device");
qos_node_consumes("AC97", "pci-bus", &opts);
qos_add_test("playback_upsample", "AC97", ac97_playback_upsample, NULL);
qos_add_test("record_downsample", "AC97", ac97_record_downsample, NULL);
}
libqos_init(ac97_register_nodes);