audio system basic interface

src/audio/alutil.h

@@ -0,0 +1,53 @@
+#ifndef SRC_AUDIO_AUDIOUTIL_H_
+#define SRC_AUDIO_AUDIOUTIL_H_
+
+#include <string>
+#include <type_traits>
+#include <cstdint>
+
+#ifdef __APPLE__
+#include <OpenAL/al.h>
+#else
+#include <AL/al.h>
+#endif
+
+#define alCheckErrorsMacro() check_al_errors(__FILE__, __LINE__)
+
+bool check_al_errors(const std::string& filename, const std::uint_fast32_t line);
+
+bool load_wav_file_header(
+    std::ifstream& file,
+    std::uint8_t& channels,
+    std::int32_t& sampleRate,
+    std::uint8_t& bitsPerSample,
+    ALsizei& size
+);
+
+char* load_wav(
+    const std::string& filename,
+    std::uint8_t& channels,
+    std::int32_t& sampleRate,
+    std::uint8_t& bitsPerSample,
+    ALsizei& size
+);
+
+static inline ALenum to_al_format(short channels, short samples){
+    bool stereo = (channels > 1);
+
+    switch (samples) {
+    case 16:
+        if (stereo)
+            return AL_FORMAT_STEREO16;
+        else
+            return AL_FORMAT_MONO16;
+    case 8:
+        if (stereo)
+            return AL_FORMAT_STEREO8;
+        else
+            return AL_FORMAT_MONO8;
+    default:
+        return -1;
+    }
+}
+
+#endif /* SRC_AUDIO_AUDIOUTIL_H_ */