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Merge pull request #10 from huiping192/feature/encoder-refactroing
encoder refactroing
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Original file line number | Diff line number | Diff line change |
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// | ||
// AudioSpecificConfig.swift | ||
// | ||
// | ||
// Created by 郭 輝平 on 2023/09/12. | ||
// | ||
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||
import Foundation | ||
import HPRTMP | ||
import AVFoundation | ||
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/* | ||
AudioSpecificConfig = 2 bytes, | ||
number = bits | ||
------------------------------ | ||
| audioObjectType (5) | | ||
| sampleingFrequencyIndex (4)| | ||
| channelConfigration (4) | | ||
| frameLengthFlag (1) | | ||
| dependsOnCoreCoder (1) | | ||
| extensionFlag (1) | | ||
------------------------------ | ||
*/ | ||
struct AudioSpecificConfig { | ||
let objectType: MPEG4ObjectID | ||
var channelConfig: ChannelConfigType = .unknown | ||
var frequencyType: SampleFrequencyType = .unknown | ||
let frameLengthFlag: Bool | ||
let dependsOnCoreCoder: UInt8 | ||
let extensionFlag: UInt8 | ||
init (data: Data) { | ||
self.objectType = MPEG4ObjectID(rawValue: Int((0b11111000 & data[0]) >> 3)) ?? .aac_Main | ||
self.frequencyType = SampleFrequencyType(rawValue: (0b00000111 & data[0]) << 1 | (0b10000000 & data[1]) >> 7) | ||
self.channelConfig = ChannelConfigType(rawValue: (0b01111000 & data[1]) >> 3) | ||
let value = UInt8(data[1] & 0b00100000) == 1 | ||
self.frameLengthFlag = value | ||
self.dependsOnCoreCoder = data[1] & 0b000000010 | ||
self.extensionFlag = data[1] & 0b000000001 | ||
} | ||
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init(objectType: MPEG4ObjectID, channelConfig: ChannelConfigType, frequencyType: SampleFrequencyType, frameLengthFlag: Bool = false, dependsOnCoreCoder: UInt8 = 0, extensionFlag: UInt8 = 0) { | ||
self.objectType = objectType | ||
self.channelConfig = channelConfig | ||
self.frequencyType = frequencyType | ||
self.frameLengthFlag = frameLengthFlag | ||
self.dependsOnCoreCoder = dependsOnCoreCoder | ||
self.extensionFlag = extensionFlag | ||
} | ||
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var encodeData: Data { | ||
get { | ||
let flag = self.frameLengthFlag ? 1 : 0 | ||
let first = UInt8(self.objectType.rawValue) << 3 | UInt8(self.frequencyType.rawValue >> 1 & 0b00000111) | ||
let second = (0b10000000 & self.frequencyType.rawValue << 7) | | ||
(0b01111000 & self.channelConfig.rawValue << 3) | | ||
(UInt8(flag) << 2) | | ||
(self.dependsOnCoreCoder << 1) | | ||
self.extensionFlag | ||
return Data([first, second]) | ||
} | ||
} | ||
} |
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