Add a test for duplex streams.

This simply checks we have (non-silent) input data with a duplex stream,
and copies it to the output, up-mixing it to stereo.

This allows the duplex code to be exercised with a real callback, but
could be more thorough. `test_resampler.cpp` unit tests the resamplers
so we should be somewhat safe nonetheless.

1 files changed, 137 insertions, 0 deletions

diff --git a/test/test_duplex.cpp b/test/test_duplex.cpp
new file mode 100644
index 0000000..117fa36
--- /dev/null
+++ b/test/test_duplex.cpp
@@ -0,0 +1,137 @@
+/*
+ * Copyright © 2016 Mozilla Foundation
+ *
+ * This program is made available under an ISC-style license.  See the
+ * accompanying file LICENSE for details.
+ */
+
+/* libcubeb api/function test. Loops input back to output and check audio
+ * is flowing. */
+#ifdef NDEBUG
+#undef NDEBUG
+#endif
+#define _XOPEN_SOURCE 500
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <assert.h>
+
+#include "../include/cubeb/cubeb.h"
+#include "common.h"
+#ifdef CUBEB_GECKO_BUILD
+#include "TestHarness.h"
+#endif
+
+#define SAMPLE_FREQUENCY 48000
+#if (defined(_WIN32) || defined(__WIN32__))
+#define STREAM_FORMAT CUBEB_SAMPLE_FLOAT32LE
+#else
+#define STREAM_FORMAT CUBEB_SAMPLE_S16LE
+#endif
+
+struct user_state
+{
+  bool seen_noise;
+};
+
+long data_cb(cubeb_stream *stream, void *user, const void * inputbuffer, void *outputbuffer, long nframes)
+{
+  user_state * u = reinterpret_cast<user_state*>(user);
+  float *ib = (float *)inputbuffer;
+  float *ob = (float *)outputbuffer;
+  bool seen_noise = false;
+
+  if (stream == NULL  || inputbuffer == NULL || outputbuffer == NULL) {
+    return CUBEB_ERROR;
+  }
+
+  // Loop back: upmix the single input channel to the two output channels,
+  // checking if there is noise in the process.
+  long output_index = 0;
+  for (long i = 0; i < nframes; i++) {
+    if (ib[i] != 0.0) {
+      seen_noise = true;
+    }
+    ob[output_index] = ob[output_index + 1] = ib[i];
+    output_index += 2;
+  }
+
+  u->seen_noise |= seen_noise;
+
+  return nframes;
+}
+
+void state_cb(cubeb_stream *stream, void *user, cubeb_state state)
+{
+  if (stream == NULL)
+    return;
+
+  switch (state) {
+  case CUBEB_STATE_STARTED:
+    printf("stream started\n"); break;
+  case CUBEB_STATE_STOPPED:
+    printf("stream stopped\n"); break;
+  case CUBEB_STATE_DRAINED:
+    printf("stream drained\n"); break;
+  default:
+    printf("unknown stream state %d\n", state);
+  }
+
+  return;
+}
+
+int main(int argc, char *argv[])
+{
+#ifdef CUBEB_GECKO_BUILD
+  ScopedXPCOM xpcom("test_record");
+#endif
+
+  cubeb *ctx;
+  cubeb_stream *stream;
+  cubeb_stream_params input_params;
+  cubeb_stream_params output_params;
+  int r;
+  cubeb_device_collection * collection;
+  user_state stream_state = { false };
+  uint32_t latency_ms = 0;
+
+  r = cubeb_init(&ctx, "Cubeb duplex example");
+  if (r != CUBEB_OK) {
+    fprintf(stderr, "Error initializing cubeb library\n");
+    return r;
+  }
+
+  /* typical user-case: mono input, stereo output, low latency. */
+  input_params.format = CUBEB_SAMPLE_FLOAT32LE;
+  input_params.rate = 48000;
+  input_params.channels = 1;
+  output_params.format = CUBEB_SAMPLE_FLOAT32LE;
+  output_params.rate = 48000;
+  output_params.channels = 2;
+
+  r = cubeb_get_min_latency(ctx, output_params, &latency_ms);
+
+  if (r != CUBEB_OK) {
+    fprintf(stderr, "Could not get minimal latency\n");
+    return r;
+  }
+
+  r = cubeb_stream_init(ctx, &stream, "Cubeb duplex",
+                        NULL, &input_params, NULL, &output_params,
+                        latency_ms, data_cb, state_cb, &stream_state);
+  if (r != CUBEB_OK) {
+    fprintf(stderr, "Error initializing cubeb stream\n");
+    return r;
+  }
+
+  cubeb_stream_start(stream);
+  delay(500);
+  cubeb_stream_stop(stream);
+
+  cubeb_stream_destroy(stream);
+  cubeb_destroy(ctx);
+
+  assert(stream_state.seen_noise);
+
+  return CUBEB_OK;
+}