[igt-dev] [PATCH i-g-t v2 3/3] lib/tests/igt_audio: add phaseshift detection test

Simon Ser
2019-06-04T11:48:36Z

Truncate a few samples in the middle of the signal, and make sure the detection
fails.

Signed-off-by: Simon Ser <simon.ser@intel.com>
---
lib/tests/igt_audio.c | 36 ++++++++++++++++++++++++++++++++++++
1 file changed, 36 insertions(+)

diff --git a/lib/tests/igt_audio.c b/lib/tests/igt_audio.c
index 821813bae47a..7c5279acc92e 100644
--- a/lib/tests/igt_audio.c
+++ b/lib/tests/igt_audio.c
@@ -33,6 +33,8 @@
#define SAMPLING_RATE 44100
#define CHANNELS 1
#define BUFFER_LEN 2048
+/** PHASESHIFT_LEN: how many samples will be truncated from the signal */
+#define PHASESHIFT_LEN 8

static const int test_freqs[] = { 300, 700, 5000 };

@@ -136,6 +138,37 @@ static void test_signal_detect_pop(struct audio_signal *signal)
igt_assert(!ok);
}

+static void test_signal_detect_phaseshift(struct audio_signal *signal)
+{
+ double *buf;
+ bool ok;
+
+ buf = malloc((BUFFER_LEN + PHASESHIFT_LEN) * sizeof(double));
+ audio_signal_fill(signal, buf, (BUFFER_LEN + PHASESHIFT_LEN) / CHANNELS);
+
+ /* Perform a phaseshift (this isn't related to sirens).
+ *
+ * The idea is to remove a part of the signal in the middle of the
+ * buffer:
+ *
+ * BUFFER_LEN/3 PHASESHIFT_LEN 2*BUFFER_LEN/3
+ * [--------------|################|---------------------------------]
+ *
+ * |
+ * V
+ *
+ * [--------------|---------------------------------]
+ */
+ memmove(&buf[BUFFER_LEN / 3], &buf[BUFFER_LEN / 3 + PHASESHIFT_LEN],
+ (2 * BUFFER_LEN / 3) * sizeof(double));
+
+ ok = audio_signal_detect(signal, SAMPLING_RATE, 0, buf, BUFFER_LEN);
+
+ free(buf);
+
+ igt_assert(!ok);
+}
+
igt_main
{
struct audio_signal *signal;
@@ -174,6 +207,9 @@ igt_main
igt_subtest("signal-detect-pop")
test_signal_detect_pop(signal);

+ igt_subtest("signal-detect-phaseshift")
+ test_signal_detect_phaseshift(signal);
+
igt_fixture {
audio_signal_fini(signal);
}
--
2.21.0