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Optimize FLAC packetizer performance (20-15s -> 4s)
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This commit is contained in:
DataHoarder 2022-07-27 11:29:00 +02:00
parent 4073f8f0d7
commit ee96281c55
Signed by: DataHoarder
SSH key fingerprint: SHA256:OLTRf6Fl87G52SiR7sWLGNzlJt4WOX+tfI2yxo0z7xk
8 changed files with 456 additions and 226 deletions
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50
audio/packetizer/flac.go
View file

@ -95,7 +95,7 @@ func readFlacHeader(br *bitio.Reader) *FLACHeaderPacket {
return nil
}
hdr := &FLACHeaderPacket{
buf: make([]byte, 0, 4096),
buf: make([]byte, 0, 1024*1024),
}
hdr.MetadataBlocks = append(hdr.MetadataBlocks, append([]byte{block}, data...))
@ -495,7 +495,7 @@ func decodeResidual(br *bitio.Reader, bw *bitio.Writer, blockSize, predictorOrde
if riceParameter, err = br.ReadBits(uint8(paramSize)); err != nil {
return err
}
_ = bw.WriteBits(riceParameter, uint8(paramSize))
_ = bw.WriteBitsUnsafe(riceParameter, uint8(paramSize))
var nsamples int
if partition != 0 {
@ -512,7 +512,7 @@ func decodeResidual(br *bitio.Reader, bw *bitio.Writer, blockSize, predictorOrde
if riceParameter2, err = br.ReadBits(5); err != nil {
return err
}
_ = bw.WriteBits(riceParameter2, 5)
_ = bw.WriteBitsUnsafe(riceParameter2, 5)
if riceParameter2 > 0 {
var sampleData []byte
@ -541,7 +541,7 @@ func decodeResidual(br *bitio.Reader, bw *bitio.Writer, blockSize, predictorOrde
if low, err = br.ReadBits(uint8(riceParameter)); err != nil {
return err
}
_ = bw.WriteBits(low, uint8(riceParameter))
_ = bw.WriteBitsUnsafe(low, uint8(riceParameter))
}
}
}
@ -551,10 +551,6 @@ func decodeResidual(br *bitio.Reader, bw *bitio.Writer, blockSize, predictorOrde
return nil
}
func decodeRicePart(br *bitio.Reader, paramSize int) {
}
func readManyBits(br *bitio.Reader, bits int) (data []byte, err error) {
dataLen := bits / 8
if (bits % 8) != 0 {
@ -585,7 +581,7 @@ func writeManyBits(bw *bitio.Writer, data []byte, bits int) (err error) {
}
}
if (bits % 8) != 0 {
if err = bw.WriteBits(uint64(data[(bits/8)]), uint8(bits%8)); err != nil {
if err = bw.WriteBitsUnsafe(uint64(data[(bits/8)]), uint8(bits%8)); err != nil {
return err
}
}
@ -593,9 +589,9 @@ func writeManyBits(bw *bitio.Writer, data []byte, bits int) (err error) {
}
func readUnary(br *bitio.Reader) (x uint64, err error) {
var bit uint64
for {
bit, err := br.ReadBits(1)
if err != nil {
if bit, err = br.ReadBits(1); err != nil {
return 0, err
}
if bit == 1 {
@ -619,15 +615,7 @@ func readUnary(br *bitio.Reader) (x uint64, err error) {
// 5 => 000001
// 6 => 0000001
func writeUnary(bw *bitio.Writer, x uint64) error {
bits := uint64(1)
n := byte(1)
for ; x > 0; x-- {
n++
}
if err := bw.WriteBits(bits, n); err != nil {
return err
}
return nil
return bw.WriteBitsUnsafe(1, uint8(x+1))
}
type FLACPacket struct {
@ -646,6 +634,8 @@ type FLACPacket struct {
FrameData []byte
buf []byte
CRC16 uint64
}
@ -779,6 +769,10 @@ func (p *FLACPacket) getBitsPerSample() uint8 {
}
func (p *FLACPacket) GetDataOffset(offset int64) []byte {
if offset == 0 && len(p.buf) > 0 {
return p.buf
}
//TODO: reserve proper amount
buf := bytes.NewBuffer(make([]byte, 0, len(p.FrameData)+64))
bw := bitio.NewWriter(buf)
@ -926,24 +920,24 @@ func (p *FLACPacket) GetDataOffset(offset int64) []byte {
_, _ = bw.Align()
_ = bw.WriteBits(uint64(CRC8ChecksumATM(buf.Bytes())), 8)
_ = bw.WriteBits(uint64(flacCrc8(buf.Bytes())), 8)
_, _ = bw.Write(p.FrameData)
_, _ = bw.Align()
_ = bw.WriteBits(uint64(CRC16ChecksumIBM(buf.Bytes())), 16)
_ = bw.WriteBits(uint64(flacCrc16(buf.Bytes())), 16)
if offset == 0 {
p.buf = buf.Bytes()
return p.buf
}
return buf.Bytes()
}
type FLACPacketizer struct {
br *bitio.Reader
hdr *FLACHeaderPacket
offset int64
samples int64
bytesRead int64
buffer []byte
br *bitio.Reader
hdr *FLACHeaderPacket
}
func (o *FLACPacketizer) GetPacket() Packet {

335
audio/packetizer/flac_crc.c Normal file
View file

@ -0,0 +1,335 @@
#include "flac_crc.h"
static const uint8_t crc8_table[256] = {
0x00, 0x07, 0x0E, 0x09, 0x1C, 0x1B, 0x12, 0x15,
0x38, 0x3F, 0x36, 0x31, 0x24, 0x23, 0x2A, 0x2D,
0x70, 0x77, 0x7E, 0x79, 0x6C, 0x6B, 0x62, 0x65,
0x48, 0x4F, 0x46, 0x41, 0x54, 0x53, 0x5A, 0x5D,
0xE0, 0xE7, 0xEE, 0xE9, 0xFC, 0xFB, 0xF2, 0xF5,
0xD8, 0xDF, 0xD6, 0xD1, 0xC4, 0xC3, 0xCA, 0xCD,
0x90, 0x97, 0x9E, 0x99, 0x8C, 0x8B, 0x82, 0x85,
0xA8, 0xAF, 0xA6, 0xA1, 0xB4, 0xB3, 0xBA, 0xBD,
0xC7, 0xC0, 0xC9, 0xCE, 0xDB, 0xDC, 0xD5, 0xD2,
0xFF, 0xF8, 0xF1, 0xF6, 0xE3, 0xE4, 0xED, 0xEA,
0xB7, 0xB0, 0xB9, 0xBE, 0xAB, 0xAC, 0xA5, 0xA2,
0x8F, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9D, 0x9A,
0x27, 0x20, 0x29, 0x2E, 0x3B, 0x3C, 0x35, 0x32,
0x1F, 0x18, 0x11, 0x16, 0x03, 0x04, 0x0D, 0x0A,
0x57, 0x50, 0x59, 0x5E, 0x4B, 0x4C, 0x45, 0x42,
0x6F, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7D, 0x7A,
0x89, 0x8E, 0x87, 0x80, 0x95, 0x92, 0x9B, 0x9C,
0xB1, 0xB6, 0xBF, 0xB8, 0xAD, 0xAA, 0xA3, 0xA4,
0xF9, 0xFE, 0xF7, 0xF0, 0xE5, 0xE2, 0xEB, 0xEC,
0xC1, 0xC6, 0xCF, 0xC8, 0xDD, 0xDA, 0xD3, 0xD4,
0x69, 0x6E, 0x67, 0x60, 0x75, 0x72, 0x7B, 0x7C,
0x51, 0x56, 0x5F, 0x58, 0x4D, 0x4A, 0x43, 0x44,
0x19, 0x1E, 0x17, 0x10, 0x05, 0x02, 0x0B, 0x0C,
0x21, 0x26, 0x2F, 0x28, 0x3D, 0x3A, 0x33, 0x34,
0x4E, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5C, 0x5B,
0x76, 0x71, 0x78, 0x7F, 0x6A, 0x6D, 0x64, 0x63,
0x3E, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2C, 0x2B,
0x06, 0x01, 0x08, 0x0F, 0x1A, 0x1D, 0x14, 0x13,
0xAE, 0xA9, 0xA0, 0xA7, 0xB2, 0xB5, 0xBC, 0xBB,
0x96, 0x91, 0x98, 0x9F, 0x8A, 0x8D, 0x84, 0x83,
0xDE, 0xD9, 0xD0, 0xD7, 0xC2, 0xC5, 0xCC, 0xCB,
0xE6, 0xE1, 0xE8, 0xEF, 0xFA, 0xFD, 0xF4, 0xF3
};
static const uint16_t crc16_table[8][256] = {
{ 0x0000, 0x8005, 0x800f, 0x000a, 0x801b, 0x001e, 0x0014, 0x8011,
0x8033, 0x0036, 0x003c, 0x8039, 0x0028, 0x802d, 0x8027, 0x0022,
0x8063, 0x0066, 0x006c, 0x8069, 0x0078, 0x807d, 0x8077, 0x0072,
0x0050, 0x8055, 0x805f, 0x005a, 0x804b, 0x004e, 0x0044, 0x8041,
0x80c3, 0x00c6, 0x00cc, 0x80c9, 0x00d8, 0x80dd, 0x80d7, 0x00d2,
0x00f0, 0x80f5, 0x80ff, 0x00fa, 0x80eb, 0x00ee, 0x00e4, 0x80e1,
0x00a0, 0x80a5, 0x80af, 0x00aa, 0x80bb, 0x00be, 0x00b4, 0x80b1,
0x8093, 0x0096, 0x009c, 0x8099, 0x0088, 0x808d, 0x8087, 0x0082,
0x8183, 0x0186, 0x018c, 0x8189, 0x0198, 0x819d, 0x8197, 0x0192,
0x01b0, 0x81b5, 0x81bf, 0x01ba, 0x81ab, 0x01ae, 0x01a4, 0x81a1,
0x01e0, 0x81e5, 0x81ef, 0x01ea, 0x81fb, 0x01fe, 0x01f4, 0x81f1,
0x81d3, 0x01d6, 0x01dc, 0x81d9, 0x01c8, 0x81cd, 0x81c7, 0x01c2,
0x0140, 0x8145, 0x814f, 0x014a, 0x815b, 0x015e, 0x0154, 0x8151,
0x8173, 0x0176, 0x017c, 0x8179, 0x0168, 0x816d, 0x8167, 0x0162,
0x8123, 0x0126, 0x012c, 0x8129, 0x0138, 0x813d, 0x8137, 0x0132,
0x0110, 0x8115, 0x811f, 0x011a, 0x810b, 0x010e, 0x0104, 0x8101,
0x8303, 0x0306, 0x030c, 0x8309, 0x0318, 0x831d, 0x8317, 0x0312,
0x0330, 0x8335, 0x833f, 0x033a, 0x832b, 0x032e, 0x0324, 0x8321,
0x0360, 0x8365, 0x836f, 0x036a, 0x837b, 0x037e, 0x0374, 0x8371,
0x8353, 0x0356, 0x035c, 0x8359, 0x0348, 0x834d, 0x8347, 0x0342,
0x03c0, 0x83c5, 0x83cf, 0x03ca, 0x83db, 0x03de, 0x03d4, 0x83d1,
0x83f3, 0x03f6, 0x03fc, 0x83f9, 0x03e8, 0x83ed, 0x83e7, 0x03e2,
0x83a3, 0x03a6, 0x03ac, 0x83a9, 0x03b8, 0x83bd, 0x83b7, 0x03b2,
0x0390, 0x8395, 0x839f, 0x039a, 0x838b, 0x038e, 0x0384, 0x8381,
0x0280, 0x8285, 0x828f, 0x028a, 0x829b, 0x029e, 0x0294, 0x8291,
0x82b3, 0x02b6, 0x02bc, 0x82b9, 0x02a8, 0x82ad, 0x82a7, 0x02a2,
0x82e3, 0x02e6, 0x02ec, 0x82e9, 0x02f8, 0x82fd, 0x82f7, 0x02f2,
0x02d0, 0x82d5, 0x82df, 0x02da, 0x82cb, 0x02ce, 0x02c4, 0x82c1,
0x8243, 0x0246, 0x024c, 0x8249, 0x0258, 0x825d, 0x8257, 0x0252,
0x0270, 0x8275, 0x827f, 0x027a, 0x826b, 0x026e, 0x0264, 0x8261,
0x0220, 0x8225, 0x822f, 0x022a, 0x823b, 0x023e, 0x0234, 0x8231,
0x8213, 0x0216, 0x021c, 0x8219, 0x0208, 0x820d, 0x8207, 0x0202 },
{ 0x0000, 0x8603, 0x8c03, 0x0a00, 0x9803, 0x1e00, 0x1400, 0x9203,
0xb003, 0x3600, 0x3c00, 0xba03, 0x2800, 0xae03, 0xa403, 0x2200,
0xe003, 0x6600, 0x6c00, 0xea03, 0x7800, 0xfe03, 0xf403, 0x7200,
0x5000, 0xd603, 0xdc03, 0x5a00, 0xc803, 0x4e00, 0x4400, 0xc203,
0x4003, 0xc600, 0xcc00, 0x4a03, 0xd800, 0x5e03, 0x5403, 0xd200,
0xf000, 0x7603, 0x7c03, 0xfa00, 0x6803, 0xee00, 0xe400, 0x6203,
0xa000, 0x2603, 0x2c03, 0xaa00, 0x3803, 0xbe00, 0xb400, 0x3203,
0x1003, 0x9600, 0x9c00, 0x1a03, 0x8800, 0x0e03, 0x0403, 0x8200,
0x8006, 0x0605, 0x0c05, 0x8a06, 0x1805, 0x9e06, 0x9406, 0x1205,
0x3005, 0xb606, 0xbc06, 0x3a05, 0xa806, 0x2e05, 0x2405, 0xa206,
0x6005, 0xe606, 0xec06, 0x6a05, 0xf806, 0x7e05, 0x7405, 0xf206,
0xd006, 0x5605, 0x5c05, 0xda06, 0x4805, 0xce06, 0xc406, 0x4205,
0xc005, 0x4606, 0x4c06, 0xca05, 0x5806, 0xde05, 0xd405, 0x5206,
0x7006, 0xf605, 0xfc05, 0x7a06, 0xe805, 0x6e06, 0x6406, 0xe205,
0x2006, 0xa605, 0xac05, 0x2a06, 0xb805, 0x3e06, 0x3406, 0xb205,
0x9005, 0x1606, 0x1c06, 0x9a05, 0x0806, 0x8e05, 0x8405, 0x0206,
0x8009, 0x060a, 0x0c0a, 0x8a09, 0x180a, 0x9e09, 0x9409, 0x120a,
0x300a, 0xb609, 0xbc09, 0x3a0a, 0xa809, 0x2e0a, 0x240a, 0xa209,
0x600a, 0xe609, 0xec09, 0x6a0a, 0xf809, 0x7e0a, 0x740a, 0xf209,
0xd009, 0x560a, 0x5c0a, 0xda09, 0x480a, 0xce09, 0xc409, 0x420a,
0xc00a, 0x4609, 0x4c09, 0xca0a, 0x5809, 0xde0a, 0xd40a, 0x5209,
0x7009, 0xf60a, 0xfc0a, 0x7a09, 0xe80a, 0x6e09, 0x6409, 0xe20a,
0x2009, 0xa60a, 0xac0a, 0x2a09, 0xb80a, 0x3e09, 0x3409, 0xb20a,
0x900a, 0x1609, 0x1c09, 0x9a0a, 0x0809, 0x8e0a, 0x840a, 0x0209,
0x000f, 0x860c, 0x8c0c, 0x0a0f, 0x980c, 0x1e0f, 0x140f, 0x920c,
0xb00c, 0x360f, 0x3c0f, 0xba0c, 0x280f, 0xae0c, 0xa40c, 0x220f,
0xe00c, 0x660f, 0x6c0f, 0xea0c, 0x780f, 0xfe0c, 0xf40c, 0x720f,
0x500f, 0xd60c, 0xdc0c, 0x5a0f, 0xc80c, 0x4e0f, 0x440f, 0xc20c,
0x400c, 0xc60f, 0xcc0f, 0x4a0c, 0xd80f, 0x5e0c, 0x540c, 0xd20f,
0xf00f, 0x760c, 0x7c0c, 0xfa0f, 0x680c, 0xee0f, 0xe40f, 0x620c,
0xa00f, 0x260c, 0x2c0c, 0xaa0f, 0x380c, 0xbe0f, 0xb40f, 0x320c,
0x100c, 0x960f, 0x9c0f, 0x1a0c, 0x880f, 0x0e0c, 0x040c, 0x820f },
{ 0x0000, 0x8017, 0x802b, 0x003c, 0x8053, 0x0044, 0x0078, 0x806f,
0x80a3, 0x00b4, 0x0088, 0x809f, 0x00f0, 0x80e7, 0x80db, 0x00cc,
0x8143, 0x0154, 0x0168, 0x817f, 0x0110, 0x8107, 0x813b, 0x012c,
0x01e0, 0x81f7, 0x81cb, 0x01dc, 0x81b3, 0x01a4, 0x0198, 0x818f,
0x8283, 0x0294, 0x02a8, 0x82bf, 0x02d0, 0x82c7, 0x82fb, 0x02ec,
0x0220, 0x8237, 0x820b, 0x021c, 0x8273, 0x0264, 0x0258, 0x824f,
0x03c0, 0x83d7, 0x83eb, 0x03fc, 0x8393, 0x0384, 0x03b8, 0x83af,
0x8363, 0x0374, 0x0348, 0x835f, 0x0330, 0x8327, 0x831b, 0x030c,
0x8503, 0x0514, 0x0528, 0x853f, 0x0550, 0x8547, 0x857b, 0x056c,
0x05a0, 0x85b7, 0x858b, 0x059c, 0x85f3, 0x05e4, 0x05d8, 0x85cf,
0x0440, 0x8457, 0x846b, 0x047c, 0x8413, 0x0404, 0x0438, 0x842f,
0x84e3, 0x04f4, 0x04c8, 0x84df, 0x04b0, 0x84a7, 0x849b, 0x048c,
0x0780, 0x8797, 0x87ab, 0x07bc, 0x87d3, 0x07c4, 0x07f8, 0x87ef,
0x8723, 0x0734, 0x0708, 0x871f, 0x0770, 0x8767, 0x875b, 0x074c,
0x86c3, 0x06d4, 0x06e8, 0x86ff, 0x0690, 0x8687, 0x86bb, 0x06ac,
0x0660, 0x8677, 0x864b, 0x065c, 0x8633, 0x0624, 0x0618, 0x860f,
0x8a03, 0x0a14, 0x0a28, 0x8a3f, 0x0a50, 0x8a47, 0x8a7b, 0x0a6c,
0x0aa0, 0x8ab7, 0x8a8b, 0x0a9c, 0x8af3, 0x0ae4, 0x0ad8, 0x8acf,
0x0b40, 0x8b57, 0x8b6b, 0x0b7c, 0x8b13, 0x0b04, 0x0b38, 0x8b2f,
0x8be3, 0x0bf4, 0x0bc8, 0x8bdf, 0x0bb0, 0x8ba7, 0x8b9b, 0x0b8c,
0x0880, 0x8897, 0x88ab, 0x08bc, 0x88d3, 0x08c4, 0x08f8, 0x88ef,
0x8823, 0x0834, 0x0808, 0x881f, 0x0870, 0x8867, 0x885b, 0x084c,
0x89c3, 0x09d4, 0x09e8, 0x89ff, 0x0990, 0x8987, 0x89bb, 0x09ac,
0x0960, 0x8977, 0x894b, 0x095c, 0x8933, 0x0924, 0x0918, 0x890f,
0x0f00, 0x8f17, 0x8f2b, 0x0f3c, 0x8f53, 0x0f44, 0x0f78, 0x8f6f,
0x8fa3, 0x0fb4, 0x0f88, 0x8f9f, 0x0ff0, 0x8fe7, 0x8fdb, 0x0fcc,
0x8e43, 0x0e54, 0x0e68, 0x8e7f, 0x0e10, 0x8e07, 0x8e3b, 0x0e2c,
0x0ee0, 0x8ef7, 0x8ecb, 0x0edc, 0x8eb3, 0x0ea4, 0x0e98, 0x8e8f,
0x8d83, 0x0d94, 0x0da8, 0x8dbf, 0x0dd0, 0x8dc7, 0x8dfb, 0x0dec,
0x0d20, 0x8d37, 0x8d0b, 0x0d1c, 0x8d73, 0x0d64, 0x0d58, 0x8d4f,
0x0cc0, 0x8cd7, 0x8ceb, 0x0cfc, 0x8c93, 0x0c84, 0x0cb8, 0x8caf,
0x8c63, 0x0c74, 0x0c48, 0x8c5f, 0x0c30, 0x8c27, 0x8c1b, 0x0c0c },
{ 0x0000, 0x9403, 0xa803, 0x3c00, 0xd003, 0x4400, 0x7800, 0xec03,
0x2003, 0xb400, 0x8800, 0x1c03, 0xf000, 0x6403, 0x5803, 0xcc00,
0x4006, 0xd405, 0xe805, 0x7c06, 0x9005, 0x0406, 0x3806, 0xac05,
0x6005, 0xf406, 0xc806, 0x5c05, 0xb006, 0x2405, 0x1805, 0x8c06,
0x800c, 0x140f, 0x280f, 0xbc0c, 0x500f, 0xc40c, 0xf80c, 0x6c0f,
0xa00f, 0x340c, 0x080c, 0x9c0f, 0x700c, 0xe40f, 0xd80f, 0x4c0c,
0xc00a, 0x5409, 0x6809, 0xfc0a, 0x1009, 0x840a, 0xb80a, 0x2c09,
0xe009, 0x740a, 0x480a, 0xdc09, 0x300a, 0xa409, 0x9809, 0x0c0a,
0x801d, 0x141e, 0x281e, 0xbc1d, 0x501e, 0xc41d, 0xf81d, 0x6c1e,
0xa01e, 0x341d, 0x081d, 0x9c1e, 0x701d, 0xe41e, 0xd81e, 0x4c1d,
0xc01b, 0x5418, 0x6818, 0xfc1b, 0x1018, 0x841b, 0xb81b, 0x2c18,
0xe018, 0x741b, 0x481b, 0xdc18, 0x301b, 0xa418, 0x9818, 0x0c1b,
0x0011, 0x9412, 0xa812, 0x3c11, 0xd012, 0x4411, 0x7811, 0xec12,
0x2012, 0xb411, 0x8811, 0x1c12, 0xf011, 0x6412, 0x5812, 0xcc11,
0x4017, 0xd414, 0xe814, 0x7c17, 0x9014, 0x0417, 0x3817, 0xac14,
0x6014, 0xf417, 0xc817, 0x5c14, 0xb017, 0x2414, 0x1814, 0x8c17,
0x803f, 0x143c, 0x283c, 0xbc3f, 0x503c, 0xc43f, 0xf83f, 0x6c3c,
0xa03c, 0x343f, 0x083f, 0x9c3c, 0x703f, 0xe43c, 0xd83c, 0x4c3f,
0xc039, 0x543a, 0x683a, 0xfc39, 0x103a, 0x8439, 0xb839, 0x2c3a,
0xe03a, 0x7439, 0x4839, 0xdc3a, 0x3039, 0xa43a, 0x983a, 0x0c39,
0x0033, 0x9430, 0xa830, 0x3c33, 0xd030, 0x4433, 0x7833, 0xec30,
0x2030, 0xb433, 0x8833, 0x1c30, 0xf033, 0x6430, 0x5830, 0xcc33,
0x4035, 0xd436, 0xe836, 0x7c35, 0x9036, 0x0435, 0x3835, 0xac36,
0x6036, 0xf435, 0xc835, 0x5c36, 0xb035, 0x2436, 0x1836, 0x8c35,
0x0022, 0x9421, 0xa821, 0x3c22, 0xd021, 0x4422, 0x7822, 0xec21,
0x2021, 0xb422, 0x8822, 0x1c21, 0xf022, 0x6421, 0x5821, 0xcc22,
0x4024, 0xd427, 0xe827, 0x7c24, 0x9027, 0x0424, 0x3824, 0xac27,
0x6027, 0xf424, 0xc824, 0x5c27, 0xb024, 0x2427, 0x1827, 0x8c24,
0x802e, 0x142d, 0x282d, 0xbc2e, 0x502d, 0xc42e, 0xf82e, 0x6c2d,
0xa02d, 0x342e, 0x082e, 0x9c2d, 0x702e, 0xe42d, 0xd82d, 0x4c2e,
0xc028, 0x542b, 0x682b, 0xfc28, 0x102b, 0x8428, 0xb828, 0x2c2b,
0xe02b, 0x7428, 0x4828, 0xdc2b, 0x3028, 0xa42b, 0x982b, 0x0c28 },
{ 0x0000, 0x807b, 0x80f3, 0x0088, 0x81e3, 0x0198, 0x0110, 0x816b,
0x83c3, 0x03b8, 0x0330, 0x834b, 0x0220, 0x825b, 0x82d3, 0x02a8,
0x8783, 0x07f8, 0x0770, 0x870b, 0x0660, 0x861b, 0x8693, 0x06e8,
0x0440, 0x843b, 0x84b3, 0x04c8, 0x85a3, 0x05d8, 0x0550, 0x852b,
0x8f03, 0x0f78, 0x0ff0, 0x8f8b, 0x0ee0, 0x8e9b, 0x8e13, 0x0e68,
0x0cc0, 0x8cbb, 0x8c33, 0x0c48, 0x8d23, 0x0d58, 0x0dd0, 0x8dab,
0x0880, 0x88fb, 0x8873, 0x0808, 0x8963, 0x0918, 0x0990, 0x89eb,
0x8b43, 0x0b38, 0x0bb0, 0x8bcb, 0x0aa0, 0x8adb, 0x8a53, 0x0a28,
0x9e03, 0x1e78, 0x1ef0, 0x9e8b, 0x1fe0, 0x9f9b, 0x9f13, 0x1f68,
0x1dc0, 0x9dbb, 0x9d33, 0x1d48, 0x9c23, 0x1c58, 0x1cd0, 0x9cab,
0x1980, 0x99fb, 0x9973, 0x1908, 0x9863, 0x1818, 0x1890, 0x98eb,
0x9a43, 0x1a38, 0x1ab0, 0x9acb, 0x1ba0, 0x9bdb, 0x9b53, 0x1b28,
0x1100, 0x917b, 0x91f3, 0x1188, 0x90e3, 0x1098, 0x1010, 0x906b,
0x92c3, 0x12b8, 0x1230, 0x924b, 0x1320, 0x935b, 0x93d3, 0x13a8,
0x9683, 0x16f8, 0x1670, 0x960b, 0x1760, 0x971b, 0x9793, 0x17e8,
0x1540, 0x953b, 0x95b3, 0x15c8, 0x94a3, 0x14d8, 0x1450, 0x942b,
0xbc03, 0x3c78, 0x3cf0, 0xbc8b, 0x3de0, 0xbd9b, 0xbd13, 0x3d68,
0x3fc0, 0xbfbb, 0xbf33, 0x3f48, 0xbe23, 0x3e58, 0x3ed0, 0xbeab,
0x3b80, 0xbbfb, 0xbb73, 0x3b08, 0xba63, 0x3a18, 0x3a90, 0xbaeb,
0xb843, 0x3838, 0x38b0, 0xb8cb, 0x39a0, 0xb9db, 0xb953, 0x3928,
0x3300, 0xb37b, 0xb3f3, 0x3388, 0xb2e3, 0x3298, 0x3210, 0xb26b,
0xb0c3, 0x30b8, 0x3030, 0xb04b, 0x3120, 0xb15b, 0xb1d3, 0x31a8,
0xb483, 0x34f8, 0x3470, 0xb40b, 0x3560, 0xb51b, 0xb593, 0x35e8,
0x3740, 0xb73b, 0xb7b3, 0x37c8, 0xb6a3, 0x36d8, 0x3650, 0xb62b,
0x2200, 0xa27b, 0xa2f3, 0x2288, 0xa3e3, 0x2398, 0x2310, 0xa36b,
0xa1c3, 0x21b8, 0x2130, 0xa14b, 0x2020, 0xa05b, 0xa0d3, 0x20a8,
0xa583, 0x25f8, 0x2570, 0xa50b, 0x2460, 0xa41b, 0xa493, 0x24e8,
0x2640, 0xa63b, 0xa6b3, 0x26c8, 0xa7a3, 0x27d8, 0x2750, 0xa72b,
0xad03, 0x2d78, 0x2df0, 0xad8b, 0x2ce0, 0xac9b, 0xac13, 0x2c68,
0x2ec0, 0xaebb, 0xae33, 0x2e48, 0xaf23, 0x2f58, 0x2fd0, 0xafab,
0x2a80, 0xaafb, 0xaa73, 0x2a08, 0xab63, 0x2b18, 0x2b90, 0xabeb,
0xa943, 0x2938, 0x29b0, 0xa9cb, 0x28a0, 0xa8db, 0xa853, 0x2828 },
{ 0x0000, 0xf803, 0x7003, 0x8800, 0xe006, 0x1805, 0x9005, 0x6806,
0x4009, 0xb80a, 0x300a, 0xc809, 0xa00f, 0x580c, 0xd00c, 0x280f,
0x8012, 0x7811, 0xf011, 0x0812, 0x6014, 0x9817, 0x1017, 0xe814,
0xc01b, 0x3818, 0xb018, 0x481b, 0x201d, 0xd81e, 0x501e, 0xa81d,
0x8021, 0x7822, 0xf022, 0x0821, 0x6027, 0x9824, 0x1024, 0xe827,
0xc028, 0x382b, 0xb02b, 0x4828, 0x202e, 0xd82d, 0x502d, 0xa82e,
0x0033, 0xf830, 0x7030, 0x8833, 0xe035, 0x1836, 0x9036, 0x6835,
0x403a, 0xb839, 0x3039, 0xc83a, 0xa03c, 0x583f, 0xd03f, 0x283c,
0x8047, 0x7844, 0xf044, 0x0847, 0x6041, 0x9842, 0x1042, 0xe841,
0xc04e, 0x384d, 0xb04d, 0x484e, 0x2048, 0xd84b, 0x504b, 0xa848,
0x0055, 0xf856, 0x7056, 0x8855, 0xe053, 0x1850, 0x9050, 0x6853,
0x405c, 0xb85f, 0x305f, 0xc85c, 0xa05a, 0x5859, 0xd059, 0x285a,
0x0066, 0xf865, 0x7065, 0x8866, 0xe060, 0x1863, 0x9063, 0x6860,
0x406f, 0xb86c, 0x306c, 0xc86f, 0xa069, 0x586a, 0xd06a, 0x2869,
0x8074, 0x7877, 0xf077, 0x0874, 0x6072, 0x9871, 0x1071, 0xe872,
0xc07d, 0x387e, 0xb07e, 0x487d, 0x207b, 0xd878, 0x5078, 0xa87b,
0x808b, 0x7888, 0xf088, 0x088b, 0x608d, 0x988e, 0x108e, 0xe88d,
0xc082, 0x3881, 0xb081, 0x4882, 0x2084, 0xd887, 0x5087, 0xa884,
0x0099, 0xf89a, 0x709a, 0x8899, 0xe09f, 0x189c, 0x909c, 0x689f,
0x4090, 0xb893, 0x3093, 0xc890, 0xa096, 0x5895, 0xd095, 0x2896,
0x00aa, 0xf8a9, 0x70a9, 0x88aa, 0xe0ac, 0x18af, 0x90af, 0x68ac,
0x40a3, 0xb8a0, 0x30a0, 0xc8a3, 0xa0a5, 0x58a6, 0xd0a6, 0x28a5,
0x80b8, 0x78bb, 0xf0bb, 0x08b8, 0x60be, 0x98bd, 0x10bd, 0xe8be,
0xc0b1, 0x38b2, 0xb0b2, 0x48b1, 0x20b7, 0xd8b4, 0x50b4, 0xa8b7,
0x00cc, 0xf8cf, 0x70cf, 0x88cc, 0xe0ca, 0x18c9, 0x90c9, 0x68ca,
0x40c5, 0xb8c6, 0x30c6, 0xc8c5, 0xa0c3, 0x58c0, 0xd0c0, 0x28c3,
0x80de, 0x78dd, 0xf0dd, 0x08de, 0x60d8, 0x98db, 0x10db, 0xe8d8,
0xc0d7, 0x38d4, 0xb0d4, 0x48d7, 0x20d1, 0xd8d2, 0x50d2, 0xa8d1,
0x80ed, 0x78ee, 0xf0ee, 0x08ed, 0x60eb, 0x98e8, 0x10e8, 0xe8eb,
0xc0e4, 0x38e7, 0xb0e7, 0x48e4, 0x20e2, 0xd8e1, 0x50e1, 0xa8e2,
0x00ff, 0xf8fc, 0x70fc, 0x88ff, 0xe0f9, 0x18fa, 0x90fa, 0x68f9,
0x40f6, 0xb8f5, 0x30f5, 0xc8f6, 0xa0f0, 0x58f3, 0xd0f3, 0x28f0 },
{ 0x0000, 0x8113, 0x8223, 0x0330, 0x8443, 0x0550, 0x0660, 0x8773,
0x8883, 0x0990, 0x0aa0, 0x8bb3, 0x0cc0, 0x8dd3, 0x8ee3, 0x0ff0,
0x9103, 0x1010, 0x1320, 0x9233, 0x1540, 0x9453, 0x9763, 0x1670,
0x1980, 0x9893, 0x9ba3, 0x1ab0, 0x9dc3, 0x1cd0, 0x1fe0, 0x9ef3,
0xa203, 0x2310, 0x2020, 0xa133, 0x2640, 0xa753, 0xa463, 0x2570,
0x2a80, 0xab93, 0xa8a3, 0x29b0, 0xaec3, 0x2fd0, 0x2ce0, 0xadf3,
0x3300, 0xb213, 0xb123, 0x3030, 0xb743, 0x3650, 0x3560, 0xb473,
0xbb83, 0x3a90, 0x39a0, 0xb8b3, 0x3fc0, 0xbed3, 0xbde3, 0x3cf0,
0xc403, 0x4510, 0x4620, 0xc733, 0x4040, 0xc153, 0xc263, 0x4370,
0x4c80, 0xcd93, 0xcea3, 0x4fb0, 0xc8c3, 0x49d0, 0x4ae0, 0xcbf3,
0x5500, 0xd413, 0xd723, 0x5630, 0xd143, 0x5050, 0x5360, 0xd273,
0xdd83, 0x5c90, 0x5fa0, 0xdeb3, 0x59c0, 0xd8d3, 0xdbe3, 0x5af0,
0x6600, 0xe713, 0xe423, 0x6530, 0xe243, 0x6350, 0x6060, 0xe173,
0xee83, 0x6f90, 0x6ca0, 0xedb3, 0x6ac0, 0xebd3, 0xe8e3, 0x69f0,
0xf703, 0x7610, 0x7520, 0xf433, 0x7340, 0xf253, 0xf163, 0x7070,
0x7f80, 0xfe93, 0xfda3, 0x7cb0, 0xfbc3, 0x7ad0, 0x79e0, 0xf8f3,
0x0803, 0x8910, 0x8a20, 0x0b33, 0x8c40, 0x0d53, 0x0e63, 0x8f70,
0x8080, 0x0193, 0x02a3, 0x83b0, 0x04c3, 0x85d0, 0x86e0, 0x07f3,
0x9900, 0x1813, 0x1b23, 0x9a30, 0x1d43, 0x9c50, 0x9f60, 0x1e73,
0x1183, 0x9090, 0x93a0, 0x12b3, 0x95c0, 0x14d3, 0x17e3, 0x96f0,
0xaa00, 0x2b13, 0x2823, 0xa930, 0x2e43, 0xaf50, 0xac60, 0x2d73,
0x2283, 0xa390, 0xa0a0, 0x21b3, 0xa6c0, 0x27d3, 0x24e3, 0xa5f0,
0x3b03, 0xba10, 0xb920, 0x3833, 0xbf40, 0x3e53, 0x3d63, 0xbc70,
0xb380, 0x3293, 0x31a3, 0xb0b0, 0x37c3, 0xb6d0, 0xb5e0, 0x34f3,
0xcc00, 0x4d13, 0x4e23, 0xcf30, 0x4843, 0xc950, 0xca60, 0x4b73,
0x4483, 0xc590, 0xc6a0, 0x47b3, 0xc0c0, 0x41d3, 0x42e3, 0xc3f0,
0x5d03, 0xdc10, 0xdf20, 0x5e33, 0xd940, 0x5853, 0x5b63, 0xda70,
0xd580, 0x5493, 0x57a3, 0xd6b0, 0x51c3, 0xd0d0, 0xd3e0, 0x52f3,
0x6e03, 0xef10, 0xec20, 0x6d33, 0xea40, 0x6b53, 0x6863, 0xe970,
0xe680, 0x6793, 0x64a3, 0xe5b0, 0x62c3, 0xe3d0, 0xe0e0, 0x61f3,
0xff00, 0x7e13, 0x7d23, 0xfc30, 0x7b43, 0xfa50, 0xf960, 0x7873,
0x7783, 0xf690, 0xf5a0, 0x74b3, 0xf3c0, 0x72d3, 0x71e3, 0xf0f0 },
{ 0x0000, 0x1006, 0x200c, 0x300a, 0x4018, 0x501e, 0x6014, 0x7012,
0x8030, 0x9036, 0xa03c, 0xb03a, 0xc028, 0xd02e, 0xe024, 0xf022,
0x8065, 0x9063, 0xa069, 0xb06f, 0xc07d, 0xd07b, 0xe071, 0xf077,
0x0055, 0x1053, 0x2059, 0x305f, 0x404d, 0x504b, 0x6041, 0x7047,
0x80cf, 0x90c9, 0xa0c3, 0xb0c5, 0xc0d7, 0xd0d1, 0xe0db, 0xf0dd,
0x00ff, 0x10f9, 0x20f3, 0x30f5, 0x40e7, 0x50e1, 0x60eb, 0x70ed,
0x00aa, 0x10ac, 0x20a6, 0x30a0, 0x40b2, 0x50b4, 0x60be, 0x70b8,
0x809a, 0x909c, 0xa096, 0xb090, 0xc082, 0xd084, 0xe08e, 0xf088,
0x819b, 0x919d, 0xa197, 0xb191, 0xc183, 0xd185, 0xe18f, 0xf189,
0x01ab, 0x11ad, 0x21a7, 0x31a1, 0x41b3, 0x51b5, 0x61bf, 0x71b9,
0x01fe, 0x11f8, 0x21f2, 0x31f4, 0x41e6, 0x51e0, 0x61ea, 0x71ec,
0x81ce, 0x91c8, 0xa1c2, 0xb1c4, 0xc1d6, 0xd1d0, 0xe1da, 0xf1dc,
0x0154, 0x1152, 0x2158, 0x315e, 0x414c, 0x514a, 0x6140, 0x7146,
0x8164, 0x9162, 0xa168, 0xb16e, 0xc17c, 0xd17a, 0xe170, 0xf176,
0x8131, 0x9137, 0xa13d, 0xb13b, 0xc129, 0xd12f, 0xe125, 0xf123,
0x0101, 0x1107, 0x210d, 0x310b, 0x4119, 0x511f, 0x6115, 0x7113,
0x8333, 0x9335, 0xa33f, 0xb339, 0xc32b, 0xd32d, 0xe327, 0xf321,
0x0303, 0x1305, 0x230f, 0x3309, 0x431b, 0x531d, 0x6317, 0x7311,
0x0356, 0x1350, 0x235a, 0x335c, 0x434e, 0x5348, 0x6342, 0x7344,
0x8366, 0x9360, 0xa36a, 0xb36c, 0xc37e, 0xd378, 0xe372, 0xf374,
0x03fc, 0x13fa, 0x23f0, 0x33f6, 0x43e4, 0x53e2, 0x63e8, 0x73ee,
0x83cc, 0x93ca, 0xa3c0, 0xb3c6, 0xc3d4, 0xd3d2, 0xe3d8, 0xf3de,
0x8399, 0x939f, 0xa395, 0xb393, 0xc381, 0xd387, 0xe38d, 0xf38b,
0x03a9, 0x13af, 0x23a5, 0x33a3, 0x43b1, 0x53b7, 0x63bd, 0x73bb,
0x02a8, 0x12ae, 0x22a4, 0x32a2, 0x42b0, 0x52b6, 0x62bc, 0x72ba,
0x8298, 0x929e, 0xa294, 0xb292, 0xc280, 0xd286, 0xe28c, 0xf28a,
0x82cd, 0x92cb, 0xa2c1, 0xb2c7, 0xc2d5, 0xd2d3, 0xe2d9, 0xf2df,
0x02fd, 0x12fb, 0x22f1, 0x32f7, 0x42e5, 0x52e3, 0x62e9, 0x72ef,
0x8267, 0x9261, 0xa26b, 0xb26d, 0xc27f, 0xd279, 0xe273, 0xf275,
0x0257, 0x1251, 0x225b, 0x325d, 0x424f, 0x5249, 0x6243, 0x7245,
0x0202, 0x1204, 0x220e, 0x3208, 0x421a, 0x521c, 0x6216, 0x7210,
0x8232, 0x9234, 0xa23e, 0xb238, 0xc22a, 0xd22c, 0xe226, 0xf220 }
};
uint8_t flac_crc8(const uint8_t *data, size_t len){
uint8_t crc = 0;
while(len--){
crc = crc8_table[crc ^ *data++];
}
return crc;
}
uint16_t flac_crc16(const uint8_t *data, size_t len){
uint16_t crc = 0;
while(len >= 8){
crc ^= data[0] << 8 | data[1];
crc = crc16_table[7][crc >> 8] ^ crc16_table[6][crc & 0xFF] ^
crc16_table[5][data[2]] ^ crc16_table[4][data[3]] ^
crc16_table[3][data[4]] ^ crc16_table[2][data[5]] ^
crc16_table[1][data[6]] ^ crc16_table[0][data[7]];
data += 8;
len -= 8;
}
while(len--){
crc = (crc<<8) ^ crc16_table[0][(crc>>8) ^ *data++];
}
return crc;
}

205
audio/packetizer/flac_crc.go
View file

@ -1,200 +1,17 @@
//go:build cgo
package packetizer
// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
/*
#cgo CFLAGS: -march=native -Ofast -std=c99
#include "flac_crc.h"
*/
import "C"
// This implements the 8-bit cyclic redundancy check, or CRC-8,
// checksum. See http://en.wikipedia.org/wiki/Cyclic_redundancy_check and
// http://www.ross.net/crc/download/crc_v3.txt for information.
// CRC8Size of a CRC-8 checksum in bytes.
const CRC8Size = 1
// Predefined polynomials.
const (
CRC8ATM = 0x07 // x^8 + x^2 + x + 1
)
// CRC8Table is a 256-word table representing the polynomial for efficient
// processing.
type CRC8Table [256]uint8
// CRC8ATMTable is the table for the CRC8ATM polynomial.
var CRC8ATMTable = makeTableCRC8(CRC8ATM)
// makeTableCRC8 returns the CRC8Table constructed from the specified polynomial.
func makeTableCRC8(poly uint8) (table *CRC8Table) {
table = new(CRC8Table)
for i := range table {
crc := uint8(i)
for j := 0; j < 8; j++ {
if crc&0x80 != 0 {
crc = crc<<1 ^ poly
} else {
crc <<= 1
}
}
table[i] = crc
}
return table
func flacCrc8(data []byte) uint8 {
return uint8(C.flac_crc8((*C.uint8_t)(&data[0]), C.size_t(len(data))))
}
// crc16Digest represents the partial evaluation of a checksum.
type crc8Digest struct {
crc uint8
table *CRC8Table
}
// NewCRC8 creates a new hash computing the CRC-8 checksum using the
// polynomial represented by the CRC8Table.
func NewCRC8(table *CRC8Table) *crc8Digest {
return &crc8Digest{0, table}
}
// NewCRC8ATM creates a new hashutil.Hash8 computing the CRC-8 checksum using the
// CRC8ATM polynomial.
func NewCRC8ATM() *crc8Digest {
return NewCRC8(CRC8ATMTable)
}
func (d *crc8Digest) Size() int {
return CRC8Size
}
func (d *crc8Digest) BlockSize() int {
return 1
}
func (d *crc8Digest) Reset() {
d.crc = 0
}
// CRC8Update returns the result of adding the bytes in p to the crc.
func CRC8Update(crc uint8, table *CRC8Table, p []byte) uint8 {
for _, v := range p {
crc = table[crc^v]
}
return crc
}
func (d *crc8Digest) Write(p []byte) (n int, err error) {
d.crc = CRC8Update(d.crc, d.table, p)
return len(p), nil
}
// Sum8 returns the 8-bit checksum of the hash.
func (d *crc8Digest) Sum8() uint8 {
return d.crc
}
func (d *crc8Digest) Sum(in []byte) []byte {
return append(in, d.crc)
}
// CRC8Checksum returns the CRC-8 checksum of data, using the polynomial represented
// by the CRC8Table.
func CRC8Checksum(data []byte, table *CRC8Table) uint8 {
return CRC8Update(0, table, data)
}
// CRC8ChecksumATM returns the CRC-8 checksum of data using the CRC8ATM polynomial.
func CRC8ChecksumATM(data []byte) uint8 {
return CRC8Update(0, CRC8ATMTable, data)
}
// CRC16Size of a CRC-16 checksum in bytes.
const CRC16Size = 2
// Predefined polynomials.
const (
CRC16IBM = 0x8005 // x^16 + x^15 + x^2 + x^0
)
// CRC16Table is a 256-word table representing the polynomial for efficient
// processing.
type CRC16Table [256]uint16
// CRC16IBMTable is the table for the CRC16IBM polynomial.
var CRC16IBMTable = makeTablecrc16(CRC16IBM)
// makeTablecrc16 returns the CRC16Table constructed from the specified polynomial.
func makeTablecrc16(poly uint16) (table *CRC16Table) {
table = new(CRC16Table)
for i := range table {
crc := uint16(i << 8)
for j := 0; j < 8; j++ {
if crc&0x8000 != 0 {
crc = crc<<1 ^ poly
} else {
crc <<= 1
}
}
table[i] = crc
}
return table
}
// crc16Digest represents the partial evaluation of a checksum.
type crc16Digest struct {
crc uint16
table *CRC16Table
}
// NewCRC16 creates a new hash computing the CRC-16 checksum using the
// polynomial represented by the CRC16Table.
func NewCRC16(table *CRC16Table) *crc16Digest {
return &crc16Digest{0, table}
}
// NewCRC16IBM creates a new hash computing the CRC-16 checksum using the
// CRC16IBM polynomial.
func NewCRC16IBM() *crc16Digest {
return NewCRC16(CRC16IBMTable)
}
func (d *crc16Digest) Size() int {
return CRC16Size
}
func (d *crc16Digest) BlockSize() int {
return 1
}
func (d *crc16Digest) Reset() {
d.crc = 0
}
// CRC16Update returns the result of adding the bytes in p to the crc.
func CRC16Update(crc uint16, table *CRC16Table, p []byte) uint16 {
for _, v := range p {
crc = crc<<8 ^ table[crc>>8^uint16(v)]
}
return crc
}
func (d *crc16Digest) Write(p []byte) (n int, err error) {
d.crc = CRC16Update(d.crc, d.table, p)
return len(p), nil
}
// Sum16 returns the 16-bit checksum of the hash.
func (d *crc16Digest) Sum16() uint16 {
return d.crc
}
func (d *crc16Digest) Sum(in []byte) []byte {
s := d.Sum16()
return append(in, byte(s>>8), byte(s))
}
// CRC16Checksum returns the CRC-16 checksum of data, using the polynomial
// represented by the CRC16Table.
func CRC16Checksum(data []byte, table *CRC16Table) uint16 {
return CRC16Update(0, table, data)
}
// CRC16ChecksumIBM returns the CRC-16 checksum of data using the CRC16IBM polynomial.
func CRC16ChecksumIBM(data []byte) uint16 {
return CRC16Update(0, CRC16IBMTable, data)
func flacCrc16(data []byte) uint16 {
return uint16(C.flac_crc16((*C.uint8_t)(&data[0]), C.size_t(len(data))))
}

6
audio/packetizer/flac_crc.h Normal file
View file

@ -0,0 +1,6 @@
#include <stdint.h>
#include <stddef.h>
uint8_t flac_crc8(const uint8_t* data, size_t len);
uint16_t flac_crc16(const uint8_t* data, size_t len);

77
audio/packetizer/flac_crc_nocgo.go Normal file
View file

@ -0,0 +1,77 @@
//go:build !cgo
package packetizer
// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Predefined polynomials.
const (
crc8ATM = 0x07 // x^8 + x^2 + x + 1
)
// crc8Table is a 256-word table representing the polynomial for efficient
// processing.
type crc8Table [256]uint8
// crc8ATMTable is the table for the crc8ATM polynomial.
var crc8ATMTable = func(poly uint8) (table *crc8Table) {
table = new(crc8Table)
for i := range table {
crc := uint8(i)
for j := 0; j < 8; j++ {
if crc&0x80 != 0 {
crc = crc<<1 ^ poly
} else {
crc <<= 1
}
}
table[i] = crc
}
return table
}(crc8ATM)
// flacCrc8 returns the CRC-8 checksum of data using the crc8ATM polynomial.
func flacCrc8(data []byte) uint8 {
var crc uint8
for _, v := range data {
crc = crc8ATMTable[crc^v]
}
return crc
}
// Predefined polynomials.
const (
crc16IBM = 0x8005 // x^16 + x^15 + x^2 + x^0
)
// crc16Table is a 256-word table representing the polynomial for efficient
// processing.
type crc16Table [256]uint16
// crc16IBMTable is the table for the crc16IBM polynomial.
var crc16IBMTable = func(poly uint16) (table *crc16Table) {
table = new(crc16Table)
for i := range table {
crc := uint16(i << 8)
for j := 0; j < 8; j++ {
if crc&0x8000 != 0 {
crc = crc<<1 ^ poly
} else {
crc <<= 1
}
}
table[i] = crc
}
return table
}(crc16IBM)
// flacCrc16 returns the CRC-16 checksum of data using the crc16IBM polynomial.
func flacCrc16(data []byte) uint16 {
var crc uint16
for _, v := range data {
crc = crc<<8 ^ crc16IBMTable[crc>>8^uint16(v)]
}
return crc
}

5
audio/packetizer/flac_test.go
View file

@ -50,8 +50,9 @@ func TestPacketizeFLAC(t *testing.T) {
break
}
packetCount++
packetBytes += len(packet.GetData())
shaPacketHasher.Write(packet.GetData())
pData := packet.GetData()
packetBytes += len(pData)
shaPacketHasher.Write(pData)
}
if packetCount != 4231 {
t.Errorf("Wrong Packet Count %d != %d", packetCount, 4231)

2
audio/packetizer/ogg_crc.c
View file

@ -68,7 +68,7 @@ static const uint32_t oggCrcTable[256] = {
0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4
};
uint32_t ogg_crc32(uint8_t* data, size_t len){
uint32_t ogg_crc32(const uint8_t* data, size_t len){
uint32_t c = 0;
for(size_t i = 0; i < len; ++i){
c = oggCrcTable[(c>>24)^data[i]] ^ (c << 8);

2
audio/packetizer/ogg_crc.h
View file

@ -1,4 +1,4 @@
#include <stdint.h>
#include <stddef.h>
uint32_t ogg_crc32(uint8_t* data, size_t len);
uint32_t ogg_crc32(const uint8_t* data, size_t len);