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PHPとRustを組み合わせて音声ファイルをエンコードする話
Shumpei Urabe
February 11, 2020
Technology
0
910
PHPとRustを組み合わせて音声ファイルをエンコードする話
PHPerKaigi 2020
https://phperkaigi.jp/2020/
Shumpei Urabe
February 11, 2020
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Transcript
PHPͱRustΛΈ߹ΘͤͯԻ ϑΝΠϧΛΤϯίʔυ͢Δ PHPerKaigi 2020 LT @yaminoma_tw
Shumpei Urabe (@yaminoma_tw) ͖ͳϑϨʔϜϫʔΫ BEAR.Sunday PHPerݟश͍
PHP FFIͷ͓ͳ͠
FFIͱʁ • PHPҎ֎ͷݴޠͰ࣮͞ΕͨωΠςΟϒίʔυΛݺͼग़͢͜ͱ ͕Ͱ͖ΔΈ • FFIωΠςΟϒ࣮ߦͳͷͰɺύϑΥʔϚϯεͷ্͕ظͰ͖ Δ
PHP FFIͷྺ࢙ • Ҏલ͔ΒPECLͰFFIͷΤΫεςϯγϣϯ͋ͬͨ • ͔͠͠ɺ10Ҏ্ߋ৽͞Ε͍ͯͳ͍ঢ়گͰ์ஔ͞Ε͍ͯͨ
PHP FFIͷྺ࢙ • ͦ͜ͰZendࣾͷDmitry StogovࢯɺlibffiΛ֦ͬͨுΛ։ൃͨ͠ • 20191݄ʹࢍ24ɺର15ͱ͍͏ൺֱతᷮࠩͰPHP 7.4ͷ࠾༻ ͕ܾ·Γɺ͜ͷ֦ு͕ແࣄPHP 7.4ʹऔΓࠐ·Εͨ
• ͦͷ݁ՌɺPECLͷFFIΤΫεςϯγϣϯʹൺΔͱɺΠϯλʔϑΣ ΠεͷΈهड़͢Δ͚ͩͰग़དྷΔΑ͏ʹͳͬͨ
ຊ
PHPͰԻϑΝΠϧΛΤϯίʔυͯ͠ΈΔ • ԻϑΝΠϧͷΤϯίʔυͱ͍͑FFmpeg͕ఆ൪Ͱ͋Δ • FFmpegͷίϚϯυΛexecͰୟ͘ͷ؆୯Ͱ͋Δ͕ɺexecͰ ࣮ߦͨ͘͠ͳ͍ͱ͖͋Δ • PHP୯ମͰԻϑΝΠϧΛΤϯίʔυͰ͖Δͱศརʂ
ͱ͍͏͜ͱͰ࡞Γ·ͨ͠
php-mp3-encoder • https://github.com/yaminoma/php-mp3-encoder • RustͰMP3ͷΤϯίʔμʔͰ͋Δlibmp3lameΛͬͯɺWAVϑΝ Πϧ͔ΒMP3ʹΤϯίʔυ͢Δαϯϓϧ • ͜ͷlibmp3lamebindgenΛͬͯRust͔ΒFFIͰݺͼग़͍ͯ͠Δ
͘͠Έ
wavͷதΛ uint8_t* Ͱ͢ Τϯίʔυͨ͠ϑΝΠϧ໊Λ char* Ͱ͢
PHPͰFFIΛ༗ޮʹͯ͠ΈΔ git clone https://github.com/php/php-src.git cd php-src git checkout PHP-7.4 ./configure
--with-ffi make
PHPͰFFIΛ༗ޮʹͯ͠ΈΔ • σϑΥϧτ ffi.enable=preload ʹͳ͓ͬͯΓɺϓϦϩʔυΛ ߦͬͨؔ·ͨCLIΠϯλʔϑΣΠεͰͷΈFFIػೳΛ༻͢ Δ͜ͱ͕Մೳ • ffi.enable=trueʹ͢ΔͱɺશͯͷFFIͷػೳΛ͏͜ͱ͕ग़དྷΔ
RustͰΤϯίʔυ͢Δ෦Λ࣮͢Δ #[no_mangle] pub extern "C" fn encode(data: *mut u8, length:
u32) -> *const c_char { unsafe { let buf: &mut [u8] = core::slice::from_raw_parts_mut(data, length as usize); let mut ptr = io::Cursor::new(buf); let mut wav_reader = hound::WavReader::new(&mut ptr).unwrap(); let mut data = Vec::new(); for sample in wav_reader.samples() { match sample { Ok(smpl) => data.push(smpl), _ => panic!("failed"), } } let timestamp = Rational64::from_integer(0); let raw_frame = RawFrame { timestamp, data }; let mut encoder = Encoder::new(); let output_file_name = encoder.encode(raw_frame); return CString::new(output_file_name) .expect("failed") .into_raw(); } }
RustͰdylibΛϏϧυͯ͠PHPͰαʔϒ͢Δ $ cargo build --release $ php -d ffi.enable=1 -S
localhost:8000 -t src
μΠφϛοΫϥΠϒϥϦΛಡΈࠐΉ $signature = "const char* encode(uint8_t *data, uint32_t length);"; return
\FFI::cdef( $signature, __DIR__ . "/../target/ release/libmp3encoder.dylib");
freadͰϑΝΠϧΛಡΈऔΔ $file = $_FILES['audio_file']['tmp_name']; $handle = fopen($file, "rb"); $fsize =
filesize($file); $value = fread($handle, $fsize);
FFIͷݺͼग़͠ͱ࣮ߦ $ffi = loadLibrary(); $length = \strlen($value); $buffer = FFI::new(FFI::arrayType($ffi->type('uint8_t'),
[$length])); FFI::memcpy($buffer, $value, $length); $bufferPtr = FFI::cast($ffi->type('uint8_t*'), $buffer); $outputFileName = $ffi->encode($bufferPtr, $length);
݁Ռ • 5ͷۂ͕େମ8ඵ͘Β͍Ͱม͕ऴΘͬͨ • PHPͷFFIͷυΩϡϝϯτ͕ใྔগͳͯ݁͘ߏۤ͠Μͩ • FFI͕༗ޮʹͳ͍ͬͯΕͲͷαʔόͰMP3͕ΤϯίʔυͰ͖ Δʂ
FFIͷকདྷ • ܭࢉྔͷଟ͍ϓϩάϥϜΛFFIͰݺͼग़͢ͱྑ͍͔͠Εͳ͍ • ·ͩ·࣮ͩݧతͳཁૉ͕ଟ͍ͷͰɺϓϩμΫγϣϯϨσΟʔͰ ͳ͍ • ͜Ε͔ΒଞͷݴޠͱΈ߹ΘͤͯPHP͕ͬͱΓ্͕͍ͬͯ ͖͍ͨʂ
͓͠·͍