1 files changed, 32 insertions, 0 deletions
diff --git a/dom/midi/AlsaCompatibility.cpp b/dom/midi/AlsaCompatibility.cpp
new file mode 100644
index 0000000000..9e219d4999
--- /dev/null
+++ b/dom/midi/AlsaCompatibility.cpp
@@ -0,0 +1,32 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/Assertions.h"
+
+// The code in this file is a workaround for building with ALSA versions prior
+// to 1.1. Various functions that the alsa crate (a dependency of the midir
+// crate) use are missing from those versions. The functions are not actually
+// used so we provide dummy implementations that return an error. This file
+// can be safely removed when the Linux sysroot will be updated to Debian 9
+// (or higher)
+#include <alsa/asoundlib.h>
+
+extern "C" {
+
+#define ALSA_DIVERT(func)                       \
+  int func(void) {                              \
+    MOZ_CRASH(#func "should never be called."); \
+    return -1;                                  \
+  }
+
+#if (SND_LIB_MAJOR == 1) && (SND_LIB_MINOR == 0) && (SND_LIB_SUBMINOR < 29)
+ALSA_DIVERT(snd_pcm_sw_params_set_tstamp_type)
+ALSA_DIVERT(snd_pcm_sw_params_get_tstamp_type)
+#endif
+
+#if (SND_LIB_MAJOR == 1) && (SND_LIB_MINOR < 1)
+ALSA_DIVERT(snd_pcm_hw_params_supports_audio_ts_type)
+ALSA_DIVERT(snd_pcm_status_set_audio_htstamp_config)
+#endif
+}