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package wav
import "core:fmt"
import "core:math"
import "core:strings"
import "core:os"
Wav :: struct {
path : string,
handle : os.Handle,
buf : []u8,
reported_size : u32,
bext : string,
ixml : string,
format : Audio_Format,
channels : int,
channel_names : []string,
sample_rate : int,
bit_depth : int,
}
Audio_Format :: enum {
PCM = 1,
FLOAT = 3,
}
BUFFER_SIZE :: 1<<15
main :: proc() {
sweden, sweden_ok := read_wav("test/sweden.wav", context.temp_allocator)
fmt.printf("\n\nsweden = %#v\n\n", sweden)
enok, enok_ok := read_wav("test/ENOKS-BIRHTDAYT02.WAV", context.temp_allocator)
fmt.printf("\n\nenok = %#v\n\n", enok)
}
read_wav :: proc(path : string, allocator:=context.allocator) -> (Wav, bool) {
file : Wav
file_ok : os.Error
file.handle, file_ok = os.open(path)
defer os.close(file.handle)
assert(file_ok == os.General_Error.None)
file.buf = new([BUFFER_SIZE]u8)[:]
defer delete(file.buf)
os.read(file.handle, file.buf)
head : int = 0
// RIFF header
fmt.println(string(file.buf[0:4]))
if string(file.buf[0:4]) != "RIFF" do return {}, false
head += 4
// Size
file.reported_size = read_little_endian_u32(file.buf[head:head+4])
fmt.println("Reported size:", file.reported_size)
head += 4
// Confirming again that this is a wave file
fmt.println(string(file.buf[head:head+4]))
if string(file.buf[head:head+4]) != "WAVE" do return {}, false
head += 4
fmt.println("\nChunks:\n")
// Looping through chunks
for _ in 0..<BUFFER_SIZE {
chunk_id := string(file.buf[head:head+4])
head += 4
chunk_size := int(read_little_endian_u32(file.buf[head:head+4]))
head += 4
fmt.println(chunk_id,"\n-------------------------------------")
if head+chunk_size < BUFFER_SIZE {
print_data : string
data_end := head+chunk_size
read_end := min(head+15000, data_end)
switch chunk_id {
case "iXML":
print_data = string(file.buf[head:read_end])
file.ixml = strings.clone(string(file.buf[head:data_end]), allocator=allocator)
case "bext":
print_data = string(file.buf[head:read_end])
file.bext = strings.clone(string(file.buf[head:data_end]), allocator=allocator)
case "fmt ":
file.format = Audio_Format(read_little_endian_u16(file.buf[head:]))
head += 2
file.channels = int(read_little_endian_u16(file.buf[head:]))
head += 2
file.sample_rate = int(read_little_endian_u32(file.buf[head:]))
head += 4
// Skipping byte rate and block align.
// These two legacy fields are only ever redundant or wrong,
// and are implied by the other fields.
head += 4 + 2
file.bit_depth = int(read_little_endian_u16(file.buf[head:]))
head += 2
}
fmt.println(print_data, "\n")
} else {
break
}
head += chunk_size
}
file.channel_names = make([]string, file.channels)
naming_channel := 0
for line in strings.split_lines(file.bext) {
if strings.starts_with(line, "sTRK") {
eq_index := strings.index(line, "=")
file.channel_names[naming_channel] = strings.clone(line[eq_index+1:], allocator=allocator)
naming_channel += 1
}
}
delete(file.buf)
file.buf = nil
return file, true
}
read_little_endian_u32 :: proc(x : []u8) -> u32 {
return u32(x[0]) |
u32(x[1]) << 8 |
u32(x[2]) << 16 |
u32(x[3]) << 24
}
read_little_endian_u16 :: proc(x : []u8) -> u16 {
return u16(x[0]) |
u16(x[1]) << 8
}
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