tests/kms_chamelium: add dp-audio test

This new test ensures DisplayPort audio works by using the Chamelium.

It enables the DisplayPort output and sends an audio signal containing a set of
frequencies we choose to all HDMI/DisplayPort audio devices. It starts
recording audio on the Chamelium device and uses the stream server to retrieve
captured audio pages. It then checks that the capture audio signal contains the
frequencies we sent, and only those, by computing a FFT.

A new library has been added to libigt to communicate with the stream server.
It implements a simple custom TCP protocol.

In case the test fails, a WAV file with the captured data is saved on disk.

Right now the test has a few limitations:

- Only the first channel is checked
- IGT only generates audio with a single sampling rate (48 KHz)
- Audio data is not captured in real-time

These limitations will be lifted in future patches.

PulseAudio must not run during the tests since ALSA is used directly. To ensure
this, edit /etc/pulse/client.conf and add `autospawn=no`. Then run
`pulseaudio --kill`.

This commit deletes the existing audio tests. They weren't run and required an
exotic configuration (HDMI audio splitter, dummy HDMI sink and a line-in port
on the DUT).

This patch also changes lib/igt_audio to use uint16_t instead of short. The
rationale is:

- The standard says a short is at least 16 bit wide, but a short can be
  larger (in practice it won't happen, but better use types correctly)
- It makes it clearer that the audio format is S16_LE, since "16" is
  in the type name.

This patch depends on the following Chameleon bugs:

- https://crbug.com/948060
- https://crbug.com/950857

Signed-off-by: Simon Ser <simon.ser@intel.com>
Reviewed-by: Martin Peres <martin.peres@linux.intel.com>

1 files changed, 52 insertions, 0 deletions

diff --git a/lib/igt_chamelium_stream.h b/lib/igt_chamelium_stream.h
new file mode 100644
index 00000000..de4e9931
--- /dev/null
+++ b/lib/igt_chamelium_stream.h
@@ -0,0 +1,52 @@
+/*
+ * 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.
+ *
+ * Authors: Simon Ser <simon.ser@intel.com>
+ */
+
+#ifndef IGT_CHAMELIUM_STREAM_H
+#define IGT_CHAMELIUM_STREAM_H
+
+#include "config.h"
+
+enum chamelium_stream_realtime_mode {
+	CHAMELIUM_STREAM_REALTIME_NONE = 0,
+	/* stop dumping when overflow */
+	CHAMELIUM_STREAM_REALTIME_STOP_WHEN_OVERFLOW = 1,
+	/* drop data on overflow */
+	CHAMELIUM_STREAM_REALTIME_BEST_EFFORT = 2,
+};
+
+struct chamelium_stream;
+
+struct chamelium_stream *chamelium_stream_init(void);
+void chamelium_stream_deinit(struct chamelium_stream *client);
+bool chamelium_stream_dump_realtime_audio(struct chamelium_stream *client,
+					  enum chamelium_stream_realtime_mode mode);
+void chamelium_stream_audio_format(struct chamelium_stream *stream,
+				   int *rate, int *channels);
+bool chamelium_stream_receive_realtime_audio(struct chamelium_stream *client,
+					     size_t *page_count,
+					     int32_t **buf, size_t *buf_len);
+bool chamelium_stream_stop_realtime_audio(struct chamelium_stream *client);
+
+#endif