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- {"ast":null,"code":"\"use strict\";\n\n// Copyright (c) Microsoft Corporation. All rights reserved.\n// Licensed under the MIT license.\nObject.defineProperty(exports, \"__esModule\", {\n value: true\n});\nexports.ReplayableAudioNode = void 0;\nclass ReplayableAudioNode {\n constructor(audioSource, bytesPerSecond) {\n this.privBuffers = [];\n this.privReplayOffset = 0;\n this.privLastShrinkOffset = 0;\n this.privBufferStartOffset = 0;\n this.privBufferSerial = 0;\n this.privBufferedBytes = 0;\n this.privReplay = false;\n this.privLastChunkAcquiredTime = 0;\n this.privAudioNode = audioSource;\n this.privBytesPerSecond = bytesPerSecond;\n }\n id() {\n return this.privAudioNode.id();\n }\n // Reads and returns the next chunk of audio buffer.\n // If replay of existing buffers are needed, read() will first seek and replay\n // existing content, and upoin completion it will read new content from the underlying\n // audio node, saving that content into the replayable buffers.\n read() {\n // if there is a replay request to honor.\n if (!!this.privReplay && this.privBuffers.length !== 0) {\n // Find the start point in the buffers.\n // Offsets are in 100ns increments.\n // So how many bytes do we need to seek to get the right offset?\n const offsetToSeek = this.privReplayOffset - this.privBufferStartOffset;\n let bytesToSeek = Math.round(offsetToSeek * this.privBytesPerSecond * 1e-7);\n if (0 !== bytesToSeek % 2) {\n bytesToSeek++;\n }\n let i = 0;\n while (i < this.privBuffers.length && bytesToSeek >= this.privBuffers[i].chunk.buffer.byteLength) {\n bytesToSeek -= this.privBuffers[i++].chunk.buffer.byteLength;\n }\n if (i < this.privBuffers.length) {\n const retVal = this.privBuffers[i].chunk.buffer.slice(bytesToSeek);\n this.privReplayOffset += retVal.byteLength / this.privBytesPerSecond * 1e+7;\n // If we've reached the end of the buffers, stop replaying.\n if (i === this.privBuffers.length - 1) {\n this.privReplay = false;\n }\n return Promise.resolve({\n buffer: retVal,\n isEnd: false,\n timeReceived: this.privBuffers[i].chunk.timeReceived\n });\n }\n }\n return this.privAudioNode.read().then(result => {\n if (result && result.buffer) {\n this.privBuffers.push(new BufferEntry(result, this.privBufferSerial++, this.privBufferedBytes));\n this.privBufferedBytes += result.buffer.byteLength;\n }\n return result;\n });\n }\n detach() {\n this.privBuffers = undefined;\n return this.privAudioNode.detach();\n }\n replay() {\n if (this.privBuffers && 0 !== this.privBuffers.length) {\n this.privReplay = true;\n this.privReplayOffset = this.privLastShrinkOffset;\n }\n }\n // Shrinks the existing audio buffers to start at the new offset, or at the\n // beginning of the buffer closest to the requested offset.\n // A replay request will start from the last shrink point.\n shrinkBuffers(offset) {\n if (this.privBuffers === undefined || this.privBuffers.length === 0) {\n return;\n }\n this.privLastShrinkOffset = offset;\n // Find the start point in the buffers.\n // Offsets are in 100ns increments.\n // So how many bytes do we need to seek to get the right offset?\n const offsetToSeek = offset - this.privBufferStartOffset;\n let bytesToSeek = Math.round(offsetToSeek * this.privBytesPerSecond * 1e-7);\n let i = 0;\n while (i < this.privBuffers.length && bytesToSeek >= this.privBuffers[i].chunk.buffer.byteLength) {\n bytesToSeek -= this.privBuffers[i++].chunk.buffer.byteLength;\n }\n this.privBufferStartOffset = Math.round(offset - bytesToSeek / this.privBytesPerSecond * 1e+7);\n this.privBuffers = this.privBuffers.slice(i);\n }\n // Finds the time a buffer of audio was first seen by offset.\n findTimeAtOffset(offset) {\n if (offset < this.privBufferStartOffset || this.privBuffers === undefined) {\n return 0;\n }\n for (const value of this.privBuffers) {\n const startOffset = value.byteOffset / this.privBytesPerSecond * 1e7;\n const endOffset = startOffset + value.chunk.buffer.byteLength / this.privBytesPerSecond * 1e7;\n if (offset >= startOffset && offset <= endOffset) {\n return value.chunk.timeReceived;\n }\n }\n return 0;\n }\n}\nexports.ReplayableAudioNode = ReplayableAudioNode;\n// Primary use of this class is to help debugging problems with the replay\n// code. 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