[igt-dev] [PATCH i-g-t 1/5] lib/igt_audio: add basic audio_signal_detect tests

[Ser, Simon]

On Mon, 2019-06-03 at 16:43 +0300, Martin Peres wrote:
> On 29/05/2019 16:32, Simon Ser wrote:
> > This adds three basic library tests for igt_audio's audio_signal_detect: one
> > that checks that detection works with the generated signal unchanged, and two
> > that check that detection properly fails with a silent/noise input signal.
> > 
> > Signed-off-by: Simon Ser <simon.ser at intel.com>
> > ---
> >  lib/tests/igt_audio.c | 101 ++++++++++++++++++++++++++++++++++++++++++
> >  lib/tests/meson.build |   7 +++
> >  2 files changed, 108 insertions(+)
> >  create mode 100644 lib/tests/igt_audio.c
> > 
> > diff --git a/lib/tests/igt_audio.c b/lib/tests/igt_audio.c
> > new file mode 100644
> > index 000000000000..0ca3a4342ad9
> > --- /dev/null
> > +++ b/lib/tests/igt_audio.c
> > @@ -0,0 +1,101 @@
> > +/*
> > + * Copyright © 2019 Intel Corporation
> > + *
> > + * Permission is hereby granted, free of charge, to any person obtaining a
> > + * copy of this software and associated documentation files (the "Software"),
> > + * to deal in the Software without restriction, including without limitation
> > + * the rights to use, copy, modify, merge, publish, distribute, sublicense,
> > + * and/or sell copies of the Software, and to permit persons to whom the
> > + * Software is furnished to do so, subject to the following conditions:
> > + *
> > + * The above copyright notice and this permission notice (including the next
> > + * paragraph) shall be included in all copies or substantial portions of the
> > + * Software.
> > + *
> > + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> > + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> > + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
> > + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
> > + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
> > + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
> > + * IN THE SOFTWARE.
> > + *
> > + * Author: Simon Ser <simon.ser at intel.com>
> > + */
> > +
> > +#include "config.h"
> > +
> > +#include "igt_core.h"
> > +#include "igt_audio.h"
> > +
> > +#define SAMPLING_RATE 44100
> > +#define CHANNELS 1
> > +#define BUFFER_LEN 2048
> > +
> > +static void test_signal_detect_verbatim(struct audio_signal *signal)
> 
> test_signal_detect_untampered would be more understandable.
> 
> > +{
> > +	double buf[BUFFER_LEN];
> > +	bool ok;
> > +
> > +	audio_signal_fill(signal, buf, BUFFER_LEN / CHANNELS);
> > +	ok = audio_signal_detect(signal, SAMPLING_RATE, 0, buf, BUFFER_LEN);
> > +	igt_assert(ok);
> > +}
> > +
> > +static void test_signal_detect_silence(struct audio_signal *signal)
> > +{
> > +	double buf[BUFFER_LEN] = {0};
> > +	bool ok;
> > +
> > +	ok = audio_signal_detect(signal, SAMPLING_RATE, 0, buf, BUFFER_LEN);
> > +
> > +	igt_assert(!ok);
> > +}
> > +
> > +static void test_signal_detect_noise(struct audio_signal *signal)
> > +{
> > +	double buf[BUFFER_LEN];
> > +	bool ok;
> > +	size_t i;
> > +
> > +	for (i = 0; i < BUFFER_LEN; i++)
> > +		buf[i] = (double) (i % 10) / 10;
> 
> This creates a period signal with a frequency of 4.410kHz... so this is
> not exactly noise.
> 
> We probably want to do:
> 
> srandom(42);
> for (i = 0; i < BUFFER_LEN; i++)
>     buf[i] = ((double) random()) / RAND_MAX;
> 
> This will create a less periodic signal, and still be repeatable (not
> sure if the random algorithm is allowed to changed between libc versions).

Indeed.

I chose to use this slightly modified formula:

    (double) random() / RAND_MAX * 2 - 1

So that samples are generated between -1 and 1.

> With the proposed changes:
> 
> Reviewed-by: Martin Peres <martin.peres at linux.intel.com>
> 
> > +
> > +	ok = audio_signal_detect(signal, SAMPLING_RATE, 0, buf, BUFFER_LEN);
> > +
> > +	igt_assert(!ok);
> > +}
> > +
> > +igt_main
> > +{
> > +	struct audio_signal *signal;
> > +	int ret;
> > +
> > +	igt_subtest_group {
> > +		igt_fixture {
> > +			signal = audio_signal_init(CHANNELS, SAMPLING_RATE);
> > +
> > +			ret = audio_signal_add_frequency(signal, 300, 0);
> > +			igt_assert(ret == 0);
> > +			ret = audio_signal_add_frequency(signal, 700, 0);
> > +			igt_assert(ret == 0);
> > +			ret = audio_signal_add_frequency(signal, 5000, 0);
> > +			igt_assert(ret == 0);
> > +
> > +			audio_signal_synthesize(signal);
> > +		}
> > +
> > +		igt_subtest("signal-detect-verbatim")
> > +			test_signal_detect_verbatim(signal);
> > +
> > +		igt_subtest("signal-detect-silence")
> > +			test_signal_detect_silence(signal);
> > +
> > +		igt_subtest("signal-detect-noise")
> > +			test_signal_detect_noise(signal);
> > +
> > +		igt_fixture {
> > +			audio_signal_fini(signal);
> > +		}
> > +	}
> > +}
> > diff --git a/lib/tests/meson.build b/lib/tests/meson.build
> > index 9950bd59c174..eb75cbd571b9 100644
> > --- a/lib/tests/meson.build
> > +++ b/lib/tests/meson.build
> > @@ -22,6 +22,13 @@ lib_fail_tests = [
> >  	'igt_timeout',
> >  ]
> >  
> > +lib_tests_deps = igt_deps
> > +
> > +if chamelium.found()
> > +	lib_deps += chamelium
> > +	lib_tests += 'igt_audio'
> > +endif
> > +
> >  foreach lib_test : lib_tests
> >  	exec = executable(lib_test, lib_test + '.c', install : false,
> >  			dependencies : igt_deps)
> >