this repo has no description
working on flac parser
+153
-19
formats
formats
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+153
-19
src/formats/flac.odin
+153
-19
src/formats/flac.odin
···
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import "core:testing"
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is_flac :: proc(r: ^bufio.Reader) -> bool {
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ReadError :: enum {
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UnknownError,
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UnsupportedFile,
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UnableToOpenFile,
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UnableToFindVorbisComment,
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}
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VorbisComment :: struct {
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title: string,
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}
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check_is_flac :: proc(r: ^bufio.Reader) -> bool {
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marker := make([]byte, 4)
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defer delete(marker)
···
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return false
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}
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fmt.printfln("Marker: %v", string(marker))
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if string(marker) != "fLaC" {
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return false
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}
···
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return true
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}
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read :: proc(file: ^os.File) {
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MAX_METADATA_BLOCK :: 128
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BLOCK_HEADER_SIZE :: 4
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VORBIS_COMMENT :: 4
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Header :: struct {
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is_last: bool,
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stream_info: u8,
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length: u32,
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}
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parse_header :: proc(arr: []byte) -> Header {
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fmt.printfln("parse_header called, len=%d, data=%v", len(arr), arr)
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assert(len(arr) >= 4)
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fmt.printfln(
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"Before return - arr[0]=%d arr[1]=%d arr[2]=%d arr[3]=%d",
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arr[0],
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arr[1],
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arr[2],
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arr[3],
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)
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return Header {
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is_last = arr[0] & 0x80 != 0,
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stream_info = arr[0] & 0x7F,
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length = u32(arr[1]) << 16 | u32(arr[2]) << 8 | u32(arr[3]),
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}
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}
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read :: proc(file: ^os.File) -> (c: VorbisComment, err: ReadError) {
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r: bufio.Reader
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buffer: [1024]byte
···
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defer bufio.reader_destroy(&r)
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// Check marker
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is_flac := check_is_flac(&r)
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if !is_flac {
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return VorbisComment{}, .UnsupportedFile
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}
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headerBytes := make([]byte, BLOCK_HEADER_SIZE)
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defer delete(headerBytes)
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for i in 0 ..< MAX_METADATA_BLOCK {
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n, err := bufio.reader_read(&r, headerBytes)
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if err != nil || n != BLOCK_HEADER_SIZE {
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return VorbisComment{}, .UnknownError
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}
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fmt.printfln("HeaderBytes: %v", headerBytes)
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fmt.printfln("About to call parse_header")
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header := parse_header(headerBytes)
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fmt.printfln("parse_header returned successfully")
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marker := make([]byte, 4)
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n, err := bufio.reader_read(&r, marker)
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fmt.printfln(
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"Parsed header: stream_info=%d, length=%d, is_last=%v",
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header.stream_info,
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header.length,
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header.is_last,
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)
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if err != nil || n != 4 {
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return // file is corrupted
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}
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if (header.stream_info == VORBIS_COMMENT) {
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fmt.printfln("Found Vorbis Comment")
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return VorbisComment{title = "Vampire in the Corner"}, nil
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}
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if string(marker) != "fLaC" {
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return // not flac
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if (header.is_last) {
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return VorbisComment{}, .UnableToFindVorbisComment
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}
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skip := header.length
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fmt.printfln("Skip: %i", skip)
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x, xerr := bufio.reader_discard(&r, int(skip))
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if xerr != nil {
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fmt.printfln("Discard error: %v", xerr)
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return VorbisComment{}, .UnknownError
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}
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if x != int(skip) {
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fmt.printfln("Discard incomplete: wanted %d, got %d", skip, x)
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// Need to handle partial discard
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}
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fmt.printfln("Discarded: %i", x)
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}
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fmt.printfln("{}", string(marker))
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return
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return VorbisComment{}, nil
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}
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@(test)
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should_read_flac_file :: proc(t: ^testing.T) {
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file_path := "../../test-data/07. Vampire in the Corner.flac"
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f, ferr := os.open(file_path, {.Read})
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if ferr != nil {
···
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defer os.close(f)
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r: bufio.Reader
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buffer: [1024]byte
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bufio.reader_init_with_buf(&r, os.to_reader(f), buffer[:])
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defer bufio.reader_destroy(&r)
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actual, err := read(f)
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actual := is_flac(&r)
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expected := "Vampire in the Corner"
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testing.expect(t, actual == true, "failed to open flac file")
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testing.expectf(
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t,
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err == nil && actual.title == expected,
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"Valid flac file wasn't parsed correctly. \n Expected %s | Actual: %s | Error: %v",
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expected,
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actual,
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err,
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)
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}
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//@(test)
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//should_check_flac_file :: proc(t: ^testing.T) {
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//
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// file_path := "../../test-data/07. Vampire in the Corner.flac"
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// f, ferr := os.open(file_path, {.Read})
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// if ferr != nil {
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// fmt.eprintfln("{}", ferr)
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// testing.expect(t, false, "failed to open flac file")
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// }
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// defer os.close(f)
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//
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//
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// r: bufio.Reader
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// buffer: [1024]byte
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// bufio.reader_init_with_buf(&r, os.to_reader(f), buffer[:])
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// defer bufio.reader_destroy(&r)
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//
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// actual := check_is_flac(&r)
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//
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// testing.expect(t, actual == true, "failed to open flac file")
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//}
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//
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//
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//@(test)
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//should_return_error_on_non_flac_file :: proc(t: ^testing.T) {
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//
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// file_path := "../../test-data/08. Last Dinosaurs - Purxst.wav"
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// f, ferr := os.open(file_path, {.Read})
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// if ferr != nil {
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// fmt.eprintfln("{}", ferr)
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// testing.expect(t, false, "failed to open flac file")
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// }
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// defer os.close(f)
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//
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//
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// r: bufio.Reader
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// buffer: [1024]byte
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// bufio.reader_init_with_buf(&r, os.to_reader(f), buffer[:])
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// defer bufio.reader_destroy(&r)
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//
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// actual := check_is_flac(&r)
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//
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// testing.expect(
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// t,
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// actual == false,
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// "check_is_flac was supposed to return false for non flac file",
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// )
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//}
test-data/08. Last Dinosaurs - Purxst.wav
test-data/08. Last Dinosaurs - Purxst.wav
This is a binary file and will not be displayed.