Initial working version

2022-12-22 20:22:22 +11:00
parent ce9675a1cc
commit ced7fa5092
902 changed files with 150252 additions and 0 deletions
@@ -0,0 +1,76 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.WavPack = void 0;
+const Token = require("token-types");
+const FourCC_1 = require("../common/FourCC");
+const SampleRates = [6000, 8000, 9600, 11025, 12000, 16000, 22050, 24000, 32000, 44100,
+    48000, 64000, 88200, 96000, 192000, -1];
+class WavPack {
+    static isBitSet(flags, bitOffset) {
+        return WavPack.getBitAllignedNumber(flags, bitOffset, 1) === 1;
+    }
+    static getBitAllignedNumber(flags, bitOffset, len) {
+        return (flags >>> bitOffset) & (0xffffffff >>> (32 - len));
+    }
+}
+exports.WavPack = WavPack;
+/**
+ * WavPack Block Header
+ *
+ * 32-byte little-endian header at the front of every WavPack block
+ *
+ * Ref: http://www.wavpack.com/WavPack5FileFormat.pdf (page 2/6: 2.0 "Block Header")
+ */
+WavPack.BlockHeaderToken = {
+    len: 32,
+    get: (buf, off) => {
+        const flags = Token.UINT32_LE.get(buf, off + 24);
+        const res = {
+            // should equal 'wvpk'
+            BlockID: FourCC_1.FourCcToken.get(buf, off),
+            //  0x402 to 0x410 are valid for decode
+            blockSize: Token.UINT32_LE.get(buf, off + 4),
+            //  0x402 (1026) to 0x410 are valid for decode
+            version: Token.UINT16_LE.get(buf, off + 8),
+            //  40-bit total samples for entire file (if block_index == 0 and a value of -1 indicates an unknown length)
+            totalSamples: /* replace with bigint? (Token.UINT8.get(buf, off + 11) << 32) + */ Token.UINT32_LE.get(buf, off + 12),
+            // 40-bit block_index
+            blockIndex: /* replace with bigint? (Token.UINT8.get(buf, off + 10) << 32) + */ Token.UINT32_LE.get(buf, off + 16),
+            // 40-bit total samples for entire file (if block_index == 0 and a value of -1 indicates an unknown length)
+            blockSamples: Token.UINT32_LE.get(buf, off + 20),
+            // various flags for id and decoding
+            flags: {
+                bitsPerSample: (1 + WavPack.getBitAllignedNumber(flags, 0, 2)) * 8,
+                isMono: WavPack.isBitSet(flags, 2),
+                isHybrid: WavPack.isBitSet(flags, 3),
+                isJointStereo: WavPack.isBitSet(flags, 4),
+                crossChannel: WavPack.isBitSet(flags, 5),
+                hybridNoiseShaping: WavPack.isBitSet(flags, 6),
+                floatingPoint: WavPack.isBitSet(flags, 7),
+                samplingRate: SampleRates[WavPack.getBitAllignedNumber(flags, 23, 4)],
+                isDSD: WavPack.isBitSet(flags, 31)
+            },
+            // crc for actual decoded data
+            crc: new Token.Uint8ArrayType(4).get(buf, off + 28)
+        };
+        if (res.flags.isDSD) {
+            res.totalSamples *= 8;
+        }
+        return res;
+    }
+};
+/**
+ * 3.0 Metadata Sub-Blocks
+ *  Ref: http://www.wavpack.com/WavPack5FileFormat.pdf (page 4/6: 3.0 "Metadata Sub-Block")
+ */
+WavPack.MetadataIdToken = {
+    len: 1,
+    get: (buf, off) => {
+        return {
+            functionId: WavPack.getBitAllignedNumber(buf[off], 0, 6),
+            isOptional: WavPack.isBitSet(buf[off], 5),
+            isOddSize: WavPack.isBitSet(buf[off], 6),
+            largeBlock: WavPack.isBitSet(buf[off], 7)
+        };
+    }
+};