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

[Martin Peres <martin.peres@linux.intel.com>]

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@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@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).

With the proposed changes:

Reviewed-by: Martin Peres <martin.peres@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)
> 
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