This introduces an audio library, with dedicated helpers for both
generating signals and detecting peak frequencies in a signal.
This library paves the way for testing audio going through display
connectors, such as HDMI.
Signed-off-by: Paul Kocialkowski <paul.kocialkowski@xxxxxxxxxxxxxxx>
---
.../intel-gpu-tools/intel-gpu-tools-docs.xml | 1 +
lib/Makefile.am | 2 +
lib/igt.h | 1 +
lib/igt_audio.c | 326 +++++++++++++++++++++
lib/igt_audio.h | 47 +++
5 files changed, 377 insertions(+)
create mode 100644 lib/igt_audio.c
create mode 100644 lib/igt_audio.h
diff --git a/docs/reference/intel-gpu-tools/intel-gpu-tools-docs.xml b/docs/reference/intel-gpu-tools/intel-gpu-tools-docs.xml
index f88afd2a..c77159cf 100644
--- a/docs/reference/intel-gpu-tools/intel-gpu-tools-docs.xml
+++ b/docs/reference/intel-gpu-tools/intel-gpu-tools-docs.xml
@@ -16,6 +16,7 @@
<chapter>
<title>API Reference</title>
<xi:include href="xml/drmtest.xml"/>
+ <xi:include href="xml/igt_audio.xml"/>
<xi:include href="xml/igt_aux.xml"/>
<xi:include href="xml/igt_chamelium.xml"/>
<xi:include href="xml/igt_core.xml"/>
diff --git a/lib/Makefile.am b/lib/Makefile.am
index 9c932d6f..5ea08314 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -33,6 +33,8 @@ if HAVE_GSL
lib_source_list += \
igt_frame.c \
igt_frame.h \
+ igt_audio.c \
+ igt_audio.h \
$(NULL)
endif
diff --git a/lib/igt.h b/lib/igt.h
index d16a4991..a75d2db7 100644
--- a/lib/igt.h
+++ b/lib/igt.h
@@ -35,6 +35,7 @@
#include "igt_dummyload.h"
#include "igt_fb.h"
#include "igt_frame.h"
+#include "igt_audio.h"
#include "igt_gt.h"
#include "igt_kms.h"
#include "igt_pm.h"
diff --git a/lib/igt_audio.c b/lib/igt_audio.c
new file mode 100644
index 00000000..527a4930
--- /dev/null
+++ b/lib/igt_audio.c
@@ -0,0 +1,326 @@
+/*
+ * Copyright © 2017 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:
+ * Paul Kocialkowski <paul.kocialkowski@xxxxxxxxxxxxxxx>
+ */
+
+#include "config.h"
+
+#include <math.h>
+#include <gsl/gsl_fft_real.h>
+
+#include "igt.h"
+
+#define FREQS_MAX 8
+
+/**
+ * SECTION:igt_audio
+ * @short_description: Library for audio-related tests
+ * @title: Audio
+ * @include: igt_audio.h
+ *
+ * This library contains helpers for audio-related tests. More specifically,
+ * it allows generating additions of sine signals as well as detecting them.
+ */
+
+struct audio_signal_freq {
+ int freq;
+
+ short *period;
+ int frames;
+ int offset;
+};
+
+struct audio_signal {
+ int channels;
+ int sampling_rate;
+
+ struct audio_signal_freq freqs[FREQS_MAX];
+ int freqs_count;
+};
+
+/**
+ * audio_signal_init:
+ * @channels: The number of channels to use for the signal
+ * @sampling_rate: The sampling rate to use for the signal
+ *
+ * Allocate and initialize an audio signal structure with the given parameters.
+ *
+ * Returns: A newly-allocated audio signal structure
+ */
+struct audio_signal *audio_signal_init(int channels, int sampling_rate)
+{
+ struct audio_signal *signal;
+
+ signal = malloc(sizeof(struct audio_signal));
+ memset(signal, 0, sizeof(struct audio_signal));
+
+ signal->sampling_rate = sampling_rate;
+ signal->channels = channels;
+
+ return signal;
+}
+
+/**
+ * audio_signal_add_frequency:
+ * @signal: The target signal structure
+ * @frequency: The frequency to add to the signal
+ *
+ * Add a frequency to the signal.
+ *
+ * Returns: An integer equal to zero for success and negative for failure
+ */
+int audio_signal_add_frequency(struct audio_signal *signal, int frequency)
+{
+ int index = signal->freqs_count;
+
+ if (index == FREQS_MAX)
+ return -1;
+
+ /* Stay within the Nyquist–Shannon sampling theorem. */
+ if (frequency > signal->sampling_rate / 2)
+ return -1;
+
+ /* Clip the frequency to an integer multiple of the sampling rate.
+ * This to be able to store a full period of it and use that for
+ * signal generation, instead of recurrent calls to sin().
+ */
+ frequency = signal->sampling_rate / (signal->sampling_rate / frequency);
+
+ igt_debug("Adding test frequency %d\n", frequency);
+
+ signal->freqs[index].freq = frequency;
+ signal->freqs[index].frames = 0;
+ signal->freqs[index].offset = 0;
+ signal->freqs_count++;
+
+ return 0;
+}
+
+/**
+ * audio_signal_synthesize:
+ * @signal: The target signal structure
+ *
+ * Synthesize the data tables for the audio signal, that can later be used
+ * to fill audio buffers. The resources allocated by this function must be
+ * freed with a call to audio_signal_clean when the signal is no longer used.
+ */
+void audio_signal_synthesize(struct audio_signal *signal)
+{
+ short *period;
+ double value;
+ int frames;
+ int freq;
+ int i, j;
+
+ if (signal->freqs_count == 0)
+ return;
+
+ for (i = 0; i < signal->freqs_count; i++) {
+ freq = signal->freqs[i].freq;
+ frames = signal->sampling_rate / freq;
+
+ period = calloc(1, frames * sizeof(short));
+
+ for (j = 0; j < frames; j++) {
+ value = 2.0 * M_PI * freq / signal->sampling_rate * j;
+ value = sin(value) * SHRT_MAX / signal->freqs_count;
+
+ period[j] = (short) value;
+ }
+
+ signal->freqs[i].period = period;
+ signal->freqs[i].frames = frames;
+ }
+}
+
+/**
+ * audio_signal_synthesize:
+ * @signal: The target signal structure
+ *
+ * Free the resources allocated by audio_signal_synthesize and remove
+ * the previously-added frequencies.
+ */
+void audio_signal_clean(struct audio_signal *signal)
+{
+ int i;
+
+ for (i = 0; i < signal->freqs_count; i++) {
+ if (signal->freqs[i].period)
+ free(signal->freqs[i].period);
+
+ memset(&signal->freqs[i], 0, sizeof(struct audio_signal_freq));
+ }
+
+ signal->freqs_count = 0;
+}
+
+/**
+ * audio_signal_fill:
+ * @signal: The target signal structure
+ * @buffer: The target buffer to fill
+ * @frames: The number of frames to fill
+ *
+ * Fill the requested number of frames to the target buffer with the audio
+ * signal data (in interleaved S16_LE format), at the requested sampling rate
+ * and number of channels.
+ */
+void audio_signal_fill(struct audio_signal *signal, short *buffer, int frames)
+{
+ short *destination;
+ short *source;
+ int total;
+ int freq_frames;
+ int freq_offset;
+ int count;
+ int i, j, k;
+
+ memset(buffer, 0, sizeof(short) * signal->channels * frames);
+
+ for (i = 0; i < signal->freqs_count; i++) {
+ total = 0;
+
+ while (total < frames) {
+ freq_frames = signal->freqs[i].frames;
+ freq_offset = signal->freqs[i].offset;
+
+ source = signal->freqs[i].period + freq_offset;
+ destination = buffer + total * signal->channels;
+
+ count = freq_frames - freq_offset;
+ if (count > (frames - total))
+ count = frames - total;
+
+ freq_offset += count;
+ freq_offset %= freq_frames;
+
+ signal->freqs[i].offset = freq_offset;
+
+ for (j = 0; j < count; j++) {
+ for (k = 0; k < signal->channels; k++) {
+ destination[j * signal->channels + k] += source[j];
+ }
+ }
+
+ total += count;
+ }
+ }
+}
+
+/**
+ * audio_signal_detect:
+ * @signal: The target signal structure
+ * @channels: The input data's number of channels
+ * @sampling_rate: The input data's sampling rate
+ * @buffer: The input data's buffer
+ * @frames: The input data's number of frames
+ *
+ * Detect that the frequencies specified in @signal, and only those, are
+ * present in the input data. The input data's format is required to be S16_LE.
+ *
+ * Returns: A boolean indicating whether the detection was successful
+ */
+bool audio_signal_detect(struct audio_signal *signal, int channels,
+ int sampling_rate, short *buffer, int frames)
+{
+ double data[frames];
+ int amplitude[frames / 2];
+ bool detected[signal->freqs_count];
+ int threshold;
+ bool above;
+ int error;
+ int freq;
+ int max;
+ int c, i, j;
+
+ /* Allowed error in Hz due to FFT step. */
+ error = sampling_rate / frames;
+
+ for (c = 0; c < channels; c++) {
+ for (i = 0; i < frames; i++)
+ data[i] = (double) buffer[i * channels + c];
+
+ gsl_fft_real_radix2_transform(data, 1, frames);
+
+ max = 0;
+
+ for (i = 0; i < frames / 2; i++) {
+ amplitude[i] = sqrt(data[i] * data[i] +
+ data[frames - i] *
+ data[frames - i]);
+ if (amplitude[i] > max)
+ max = amplitude[i];
+ }
+
+ for (i = 0; i < signal->freqs_count; i++)
+ detected[i] = false;
+
+ threshold = max / 2;
+ above = false;
+ max = 0;
+
+ for (i = 0; i < frames / 2; i++) {
+ if (amplitude[i] > threshold)
+ above = true;
+
+ if (above) {
+ if (amplitude[i] < threshold) {
+ above = false;
+ max = 0;
+
+ for (j = 0; j < signal->freqs_count; j++) {
+ if (signal->freqs[j].freq >
+ freq - error &&
+ signal->freqs[j].freq <
+ freq + error) {
+ detected[j] = true;
+ break;
+ }
+ }
+
+ /* Detected frequency was not generated. */
+ if (j == signal->freqs_count) {
+ igt_debug("Detected additional frequency: %d\n",
+ freq);
+ return false;
+ }
+ }
+
+ if (amplitude[i] > max) {
+ max = amplitude[i];
+ freq = sampling_rate * i / frames;
+ }
+ }
+ }
+
+ for (i = 0; i < signal->freqs_count; i++) {
+ if (!detected[i]) {
+ igt_debug("Missing frequency: %d\n",
+ signal->freqs[i].freq);
+ return false;
+ }
+ }
+ }
+
+ return true;
+}
diff --git a/lib/igt_audio.h b/lib/igt_audio.h
new file mode 100644
index 00000000..507e7ab9
--- /dev/null
+++ b/lib/igt_audio.h
@@ -0,0 +1,47 @@
+/*
+ * Copyright © 2017 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:
+ * Paul Kocialkowski <paul.kocialkowski@xxxxxxxxxxxxxxx>
+ */
+
+#ifndef IGT_AUDIO_H
+#define IGT_AUDIO_H
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "igt.h"
+#include <stdbool.h>
+
+struct audio_signal;
+
+struct audio_signal *audio_signal_init(int channels, int sampling_rate);
+int audio_signal_add_frequency(struct audio_signal *signal, int frequency);
+void audio_signal_synthesize(struct audio_signal *signal);
+void audio_signal_clean(struct audio_signal *signal);
+void audio_signal_fill(struct audio_signal *signal, short *buffer, int frames);
+bool audio_signal_detect(struct audio_signal *signal, int channels,
+ int sampling_rate, short *buffer, int frames);
+
+#endif
--
2.14.0
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