sdl2::mixer: implement sample loading

1 files changed, 33 insertions, 0 deletions

diff --git a/sdl2/mixer/samples.ha b/sdl2/mixer/samples.ha
new file mode 100644
index 0000000..49f1e1e
--- /dev/null
+++ b/sdl2/mixer/samples.ha
@@ -0,0 +1,33 @@
+use fs;
+use io;
+use os;
+use sdl2;
+
+// The internal format for an audio chunk
+export type chunk = struct {
+	allocated: int,
+	abuf: *u8,
+	alen: u32,
+	volume: u8,
+};
+
+@symbol("Mix_LoadWAV_RW") fn _loadwav_rw(src: *sdl2::rwops, freesrc: int) nullable *chunk;
+
+// Loads a sample from an [[io::handle]]. The stream will not be closed for you.
+export fn load(src: io::handle) (*chunk | sdl2::error) = {
+	const rw = sdl2::rw_from_handle(src);
+	defer sdl2::rwclose(rw);
+	return sdl2::wrapptr(_loadwav_rw(rw, 0))?: *chunk;
+};
+
+// Loads a sample from a file path.
+export fn load_file(src: str) (*chunk | fs::error | sdl2::error) = {
+	const file = os::open(src)?;
+	defer io::close(file);
+	return load(file);
+};
+
+// Free the memory used in chunk, and free chunk itself as well. Do not use
+// chunk after this without loading a new sample to it. Note: It's a bad idea to
+// free a chunk that is still being played... 
+export @symbol("Mix_FreeChunk") fn free_chunk(chunk: *chunk) void;