今日から分かる AVAudioEngineの全て

iOSDC Japan 2020
https://iosdc.jp/2020/

Transcript

1. ࠓ೔͔Β෼͔Δ AVAudioEngineͷશͯ 2020.09.19 ߹ಉձࣾφΫα
 ઎෦ ॡฏ
2. ࣗݾ঺հ ઎෦ ॡฏ • ߹ಉձࣾφΫαɹ୅ද • ΤϯλϝͷϥΠϒ഑৴Λࢧ͍͑ͯ ·͢ • झຯ͸࡞ۂͱωοτϫʔΫӡ༻ • iOSͷҰ൪޷͖ͳϑϨʔϜϫʔΫ͸ VideoToolboxͱAudioToolboxͱ Accelerate
3. ͸͡Ίʹ 1.
4. w ຊ೔ͭ໨ͷηογϣϯͱ͍͏͜ͱͰɺօ͞Μ੝Γ্͕ͬ ͍ͯ·͔͢ʁ
   w ࠓ೔͸લ໷ࡇͰ͕͢ɺ໌೔໌ޙ೔΋༷ʑͳηογϣϯ͕͋ Γ·͢ iOSDC લ໷ࡇʂ
5. w ࠓ೔ͷηογϣϯ͸ɺଞͷํʑͷηογϣϯΛΑΓਂ͘ཧ ղ͢ΔͨΊʹɺ͋·Γ஌ΒΕ͍ͯͳ͍ίΞͳ࿩Λ͠·͢
   w ੋඇࠓ೔ֶΜͰɺଞͷํͷηογϣϯͷࢀߟʹͳΕ͹ͱ ࢥ͍ͬͯ·͢ iOSDC લ໷ࡇʂ
6. w ࠓ೔͸χονͳ࿮ͳͷͰɺ͋·Γʹ΋ٕज़͹͔Γ࿩͍ͯ͠ Δͱ຾ͨ͘ͳΓͦ͏ͳͷͰɺఔΑ͘ࡶஊ΋ڬΈͳ͕Βਐߦ ͍͖ͯ͠·͢
   w ෼ͱ௕͍ͷͰɺਫ෼ͪΌΜͱऔ͍ͬͯͩ͘͞ʂ iOSDC લ໷ࡇʂ
7. w ͜ͷηογϣϯͰ͸ɺ؆ུԽͷͨΊʹදݱΛม͍͑ͯΔ෦ ෼͕ଟ͋͘Γ·͢
   w ޡࣈ୤ࣈ΍ؒҧ͍ͳͲؾ͍ͮͨΒɺεϐʔΧʔ·Ͱͬͦ͜ Γڭ͍͑ͯͩ͘͞ɻԹ͔͍໨Ͱݟक͍͚ͬͯͨͩΔͱ޾͍ Ͱ͢ɻ iOSDC લ໷ࡇʂ
8. w ͦΕͰ͸ɺຊ୊ʹೖΓ·͢ɻ iOSDC લ໷ࡇʂ
9. 
   ͸͡Ίʹ
   
   "VEJP6OJU
   
   "7"VEJP4FTTJPO
   
   "7"VEJP&OHJOF 
   "7"VEJP/PEF
   
   &YBNQMFT
   
   ·ͱΊ
   
   ࢀߟࢿྉ ΋͘͡
10. w J04Ͱ͸ɺΦʔσΟΦपΓͷػೳ͸$PSF"VEJPͱݺ͹ΕΔ ΞʔΩςΫνϟʹ·ͱΊΒΕ͍ͯΔ
    w $PSF"VEJPʹ͸ͭͷϑϨʔϜϫʔΫ͕͋Γɺͦͷதʹ αʔϏεͱݺ͹ΕΔػೳ͕͋Δɹ CoreAudio
11. iOS Audio Stack "7"VEJP&OHJOF
    JO
    1SBDUJDF
    
    "QQMFΑΓਤΛҾ༻
    IUUQTEFWTUSFBNJOHDEOBQQMFDPNWJEFPTXXEDYYWPWPWL@BWBVEJPFOHJOF@JO@QSBDUJDFQEG
12. w $PSF
    "VEJPͷҰ෦ػೳ͸"7'PVOEBUJPOʹҠಈ͞Ε͍ͯΔ
    w "7"VEJP4FTTJPO "VEJP4FTTJPO
    "7"VEJP&OHJOF "6(SBQI
    w ݟͯͷ௨Γɺ"7'PVOEBUJPOʹ͸QSFGJYʹ"7͕෇͍͍ͯΔ
    w $PSF
    "VEJPΛ֮͑ͳͯ͘΋ΞϓϦ͸͔͚Δ͕ɺτϥϒϧγϡʔςΟ ϯά͢Δ࣌ʹେมͳͷͰɺ$PSF
    "VEJPΛֶΜͰཧղΛਂΊ͍ͨ CoreAudio
13. AudioUnit 2.
14. w ΦʔσΟΦϢχοτͱݺ͹ΕΔΦʔσΟΦॲཧ༻ͷϓϥά ΠϯΛ࢖༻͢ΔͨΊͷΠϯλʔϑΣʔεΛఏڙ͍ͯ͠Δ
    w J04Ͱ͸"QQMF͕ఏڙ͍ͯ͠ΔΦʔσΟΦϢχοτ͔͠࢖ ༻͢Δ͜ͱ͕ग़དྷͳ͍ AudioUnit
15. w L"VEJP6OJU5ZQF@0VUQVU
    w L"VEJP6OJU5ZQF@.VTJD%FWJDF
    w L"VEJP6OJU5ZQF@'PSNBU$POWFSUFS
    w L"VEJP6OJU5ZQF@&GGFDU
    w L"VEJP6OJU5ZQF@.JYFS
    w L"VEJP6OJU5ZQF@(FOFSBUPS AudioUnitͷछྨ
16. w L"VEJP6OJU4VC5ZQF@3FNPUF*0
    w J04Ͱ͸جຊతʹ3FNPUF*0͕࢖ΘΕΔ
    w L"VEJP6OJU4VC5ZQF@7PJDF1SPDFTTJOH*0
    w 7P*1Λ࢖͏ͱ͖ʹ࢖ΘΕΔ
    w ΤίʔΩϟϯηϧ΍ϊΠζΩϟϯηϧ͕ࣗಈతʹ0/ʹͳΔ kAudioUnitType_Output
17. w L"VEJP6OJU4VC5ZQF@4BNQMFS
    w αϯϓϥʔΛ໐Βͨ͢ΊͷΦʔσΟΦϢχοτ kAudioUnitType_MusicDevice
18. w L"VEJP6OJU4VC5ZQF@"6$POWFSUFS
    w L"VEJP6OJU4VC5ZQF@"6J1PE5JNF0UIFS
    w L"VEJP6OJU4VC5ZQF@%FGFSSFE3FOEFSFS
    w L"VEJP6OJU4VC5ZQF@.FSHFS
    w L"VEJP6OJU4VC5ZQF@.VMUJ4QMJUUFS
    w L"VEJP6OJU4VC5ZQF@/FX5JNF1JUDI
    w L"VEJP6OJU4VC5ZQF@3PVOE5SJQ""$ kAudioUnitType_FormatConverter w L"VEJP6OJU4VC5ZQF@4QMJUUFS
    w L"VEJP6OJU4VC5ZQF@7BSJTQFFE
    
19. w L"VEJP6OJU4VC5ZQF@#BOE1BTT'JMUFS
    w L"VEJP6OJU4VC5ZQF@%FMBZ
    w L"VEJP6OJU4VC5ZQF@%JTUPSUJPO
    w L"VEJP6OJU4VC5ZQF@%ZOBNJDT1SPDFTTPS
    w L"VEJP6OJU4VC5ZQF@)JHI1BTT'JMUFS
    w L"VEJP6OJU4VC5ZQF@)JHI4IFMG'JMUFS
    w L"VEJP6OJU4VC5ZQF@-PX1BTT'JMUFS
    w L"VEJP6OJU4VC5ZQF@-PX4IFMG'JMUFS kAudioUnitType_Effect w L"VEJP6OJU4VC5ZQF@/#BOE&2
    w L"VEJP6OJU4VC5ZQF@1BSBNFUSJD&2
    w L"VEJP6OJU4VC5ZQF@1FBL-JNJUFS
    w L"VEJP6OJU4VC5ZQF@4BNQMF%FMBZ
    
20. w L"VEJP6OJU4VC5ZQF@.VMUJ$IBOOFM.JYFS
    w ෳ਺ͷνϟϯωϧΛϛοΫε͢ΔΦʔσΟΦϢχοτ
    w L"VEJP6OJU4VC5ZQF@.BUSJY.JYFS
    w ෳ਺νϟϯωϧΛͦͷ··ѻ͏ΦʔσΟΦϢχοτ kAudioUnitType_Mixer
21. w L"VEJP6OJU4VC5ZQF@4DIFEVMFE4PVOE1MBZFS
    w ࢦఆͨ࣌ؒ͠ʹ࠶ੜ͢ΔΦʔσΟΦΛεέδϡʔϦϯά͢Δ δΣωϨʔλʔϢχοτ
    w L"VEJP6OJU4VC5ZQF@"VEJP'JMF1MBZFS
    w ϑΝΠϧͷ࠶ੜΛߦ͏δΣωϨʔλʔϢχοτ kAudioUnitType_Generator
22. w "VEJP6OJUΛͦͷ··ѻ͏ͷ͸ͱͯ΋େม
    w ͦͷͨΊɺ"7"VEJP6OJUͱݺ͹ΕΔϥούʔ͕͋Δ
    w "7"VEJP&OHJOFͰ͸"7"VEJP6OJUΛ࢖͏͜ͱͰɺ಺෦ తʹ͸"VEJP6OJUΛݺͼग़͍ͯ͠Δ AVAudioUnit
23. AVAudioSession 3.
24. iOS Audio Stack "7"VEJP&OHJOF
    JO
    1SBDUJDF
    
    "QQMFΑΓਤΛҾ༻
    IUUQTEFWTUSFBNJOHDEOBQQMFDPNWJEFPTXXEDYYWPWPWL@BWBVEJPFOHJOF@JO@QSBDUJDFQEG
25. w J04Ͱ͸ɺ"VEJP
    4FTTJPO
    4FSWJDFTͱݺ͹ΕΔαʔϏε͕ ͋ͬͨ
    w ଞͷΞϓϦέʔγϣϯͷঢ়گʹԠͯ͡ɺΞϓϦέʔγϣϯ ͷΦʔσΟΦͷಈ࡞Λ؅ཧ͢Δ͜ͱ͕Ͱ͖Δ AudioSession
26. w ݩʑ"VEJP4FTTJPO͸"VEJP5PPMCPYʹ͕͋ͬͨɺݱࡏ͸ "7'PVOEBUJPOʹ͋Δ"7"VEJP4FTTJPOʹஔ͖׵Θͬͨ
    w "7"VEJP4FTTJPO͸ɺ"VEJP4FTTJPOΑΓ΋ѻ͍΍͘͢ ͳ͍ͬͯΔ AVAudioSession
27. w EFGBVMU
    w ௨ৗ࣌͸ͪ͜ΒΛબ୒
    w WPJDF$IBU WJEFP$IBU
    w "VEJP6OJUͷ7PJDF
    1SPDFTTJOH
    *0͕༗ޮʹͳΔ
    w NPWJF1MBZCBDL
    w εςϨΦ͕ڧԽ͞ΕΔ
    w TQPLFO"VEJP
    w Ի੠ͷׂΓࠐΈ࣌ʹҰ࣌தஅ͢Δͱ͖ʹ࢖͏ʢΧʔφϏήʔγϣϯͷҊ಺ͳͲʣ Mode
28. w BNCJFOU
    w ϩοΫͨ͠৔߹΍αΠϨϯτʹͨ͠৔߹͸Ի͕ϛϡʔτʹͳΔ
    w QMBZCBDL
    w BNCJFOUͱ͸ҟͳΓɺϩοΫͨ͠৔߹΍αΠϨϯτʹͨ͠৔߹Ͱ΋Ի͸ྲྀΕΔ
    w SFDPSE
    w ࿥Ի͢Δ৔߹ʹ࢖͏ɻ࿥Ի͠ͳ͕ΒԿ͔ྲྀ͍ͨ͠৔߹͸QMBZ"OE3FDPSEΛ࢖ ͏ɻ Category
29. w NJY8JUI0UIFST
    w ଞͷΞϓϦ͔ΒׂΓࠐΈ͕͋ͬͯ΋࠶ੜΛதஅ͠ͳ͍Φϓγϣϯ
    w BMMPX#MVFUPPUI
    w #MVFUPPUIΛϧʔςΟϯάͰ͖ΔΑ͏ʹ͢Δ
    w BMMPX"JS1MBZ
    w "JS1MBZΛϧʔςΟϯάͰ͖ΔΑ͏ʹ͢Δ
    w EFGBVMU5P4QFBLFS
    w ϧʔςΟϯάΛ಺ଂεϐʔΧʔ༏ઌʹ͢Δ Category Options
30. w TFU1SFGFSSFE4BNQMF3BUF
    w αϯϓϧϨʔτΛࢦఆͰ͖Δɻ͋͘·Ͱ΋༏ઌͳͷͰɺඞͣ͠΋ࢦఆ͞ΕͨαϯϓϧϨʔτ͕࢖ΘΕΔͱ ͸ݶΒͳ͍ɻ
    w TFU1SFGFSSFE%BUB4PVSDF
    w ͲͷϚΠΫΛ࢖͏͔ࢦఆ͢Δ͜ͱ͕Ͱ͖Δɻલ໘ɾഎ໘Ͱ੾Γସ͍͑ͨͱ͖ʹ࢖͏ɻ
    w TFU1SFGFSSFE*OQVU
    w ೖྗͷϙʔτΛࢦఆ͢Δ͜ͱ͕Ͱ͖Δɻ64#΍#MVFUPPUIΛ༏ઌͯ͠࢖͍͍ͨͳͲɻ
    w PWFSSJEF0VUQVU"VEJP1PSU
    w ग़ྗϙʔτΛ্ॻ͖Ͱ͖Δɻ͕ɺ͜ΕΛࢦఆ͢Δͱڍಈ͕͓͔͘͠ͳΔ͜ͱ͕Α͘ଟ͍ɻ Other
31. w "7"VEJP4FTTJPO͸
    TFU"DUJWF USVF
    ͰɺͦͷηογϣϯΛ༗ޮʹ͢Δ͜ͱ͕Ͱ͖Δ
    w TFU"DUJWF࣌ʹOPUJGZ0UIFST0O%FBDUJWBUJPOͷΦϓγϣϯΛ෇༩͢Δ͜ͱͰɺࣗ਎ͷηογϣϯ͕ඇΞΫ ςΟϒʹͳͬͨ࣌ʹଞͷΞϓϦʹ௨஌͢Δ͜ͱ͕Ͱ͖Δ
    w "7"VEJP4FTTJPOͷTFU"DUJWF͸Կ౓΋ݺͼग़ͯ͠΋͍͍ɻҰ౓༗ޮʹͳ͍ͬͯΔ৔߹͸Τϥʔ͕ฦͬͯ͘ Δɻ
    w ΞϓϦΛऴྃ͢Δ৔߹͸ɺηογϣϯ͕ඞཁͳ͍৔߹͸TFU"DUJWF GBMTF ͰηογϣϯΛऴྃͤ͞Δඞཁ͕͋ Δ
    w ଟ͘ͷΞϓϦʹ͓͍ͯɺηογϣϯΛऴྃ͠ͳ͍έʔε͕ଟ͍ͨΊɺࠔ͍ͬͯ·͢ɻօ͞ΜɺඞͣΞϓϦ ऴྃ͢Δ৔߹͸TFU"DUJWF GBMTF ʹ͍ͯͩ͘͠͞ʂ Active
32. w "7"VEJP4FTTJPOͰ͸ɺ/PUJGJDBUJPO$FOUFSͰηογϣϯͷঢ়ଶΛऔಘ͢Δ͜ͱ͕Ͱ͖Δ
    w "7"VEJP4FTTJPOJOUFSSVQUJPO/PUJGJDBUJPOͰ͸ɺ్தͰׂΓࠐΈ͕ೖͬͨࡍʹ௨஌Λड͚औΔ͜ͱ͕Ͱ͖ Δɻ·ͨɺͦͷ࣌ʹׂΓࠐΈཧ༝͕"7"VEJP4FTTJPO*OUFSSVQUJPO5ZQFͱͯ͠औಘ͢Δ͜ͱ͕Ͱ͖Δɻ
    w "7"VEJP4FTTJPOSPVUF$IBOHF/PSUJGJDBUJPOͰ͸ɺԻ੠ग़ྗͷϧʔτ͕มߋʹͳͬͨࡍʹ௨஌Λड͚औΔ͜ ͱ͕Ͱ͖Δɻ·ͨɺͦͷ࣌ʹมߋཧ༝͕"7"VEJP4FTTJPO3PVUF$IBOHF3FBTPOͰऔಘͰ͖Δɻ
    w "7"VEJP4FTTJPONFEJB4FSWJDFT8FSF3FTFU/PUJGJDBUJPOͰ͸ɺϝσΟΞαʔϏε͕࠶ىಈͨ͠ࡍʹ௨஌Λ ड͚औΔ͜ͱ͕Ͱ͖ΔɻϝσΟΞαʔϏεͷ࠶ىಈ͸ɺҙਤͤͣʹམͪΔ৔߹͕ଟ͘ɺ࠶ىಈͨ͠৔߹͸طଘ ͷηογϣϯ͸ແޮʹͳΔͨΊɺ࠶౓"DUJWF͢Δඞཁ͕͋Δɻ NotificationCenter
33. AVAudioEngine 4.
34. iOS Audio Stack "7"VEJP&OHJOF
    JO
    1SBDUJDF
    
    "QQMFΑΓਤΛҾ༻
    IUUQTEFWTUSFBNJOHDEOBQQMFDPNWJEFPTXXEDYYWPWPWL@BWBVEJPFOHJOF@JO@QSBDUJDFQEG
35. w "7"VEJP&OHJOF͸ɺΦʔσΟΦ৴߸ͷੜ੒ͱॲཧɺΦʔσΟΦͷೖग़ྗ΍ΦʔσΟΦϊʔυͷͭͳ͗ࠐΈΛ ߦ͏Ϋϥε
    w લੈ͸"VEJP5PPMCPYʹ͋ͬͨ"VEJP
    6OJU
    1SPDFTTJOH
    (SBQI
    4FSWJDFT "6(SBQI Ͱ͋Δ
    w "6(SBQIͰ͸ɺάϥϑΦϒδΣΫτͱͯ͠ɺΦʔσΟΦϢχοτΛϊʔυͰ઀ଓ͢Δ͜ͱ͕Ͱ͖͕ͨɺ "7"VEJP&OHJOF΋ಉ͜͡ͱ͕Ͱ͖Δ
    w "6(SBQIʹൺ΂Δͱɺ"7'PVOEBUJPOʹҠ੶ͨͨ͠Ίɺͱͯ΋ѻ͍΍͘͢ͳ͍ͬͯΔ AVAudioEngine
36. AVAudioNode 5.
37. AVAudioEngine 1MBZFS
    /PEF .JYFS
    /PEF 0VUQVU
    /PEF *OQVU
    /PEF
38. w "7"VEJP/PEF͸ɺ"7"VEJP&OHJOFʹ͓͍ͯɺ֤ΦʔσΟΦϢχοτΛͭͳ͛ΔϞδϡʔϧͰ͋Δ
    w "7"VEJP/PEFΛܨ͍͛ͯ͘͜ͱͰɺೖྗͱॲཧͱग़ྗΛ࣮ݱ͢Δ͜ͱ͕Ͱ͖Δ
    w "7"VEJP/PEF͸ɺ͍͔ͭ͘ͷ੍໿͕͋Δ
    w 0VUQVU/PEFҎ֎͸ϑΥʔϚοτΛڞ௨ʹ͢Δඞཁ͕͋Δ
    w .JYFS/PEFͱ0VUQVU/PEF͸໌ࣔతʹݺ͹ΕΔͨΊ࡟আ͢Δ͜ͱ͕Ͱ͖ͳ͍
    w ֤ϊʔυ͸ഉଞ੍ޚͰ͋ΔɻͦͷͨΊɺ֤ϊʔυΛෳ਺Օॴ͔ΒݺͿͱϨʔείϯσΟγϣϯ͕ൃੜ͢Δ AVAudioNode
39. AVAudioEngine 1MBZFS
    /PEF .JYFS
    /PEF 0VUQVU
    /PEF *OQVU
    /PEF
40. w "7"VEJP1MBZFS΍"71MBZFSͱ͸શ͘ҟͳΔ
    w "7"VEJP1MBZFS/PEF͸"7"VEJP1$.#VGGFS΍"7"VEJP'JMFͳͲͷೖྗΛαϙʔτ͍ͯ͠Δ
    AVAudioPlayerNode
41. AVAudioEngine 1MBZFS
    /PEF .JYFS
    /PEF 0VUQVU
    /PEF *OQVU
    /PEF
42. w "7"VEJP*OQVU/PEF͸҉໧తʹݺͼग़͞ΕΔ
    w ͜͜Ͱ͸ɺೖྗϋʔυ΢ΣΞʢϚΠΫͳͲʣ͔ΒΦʔσΟΦσʔλΛड͚औΔ
    w "7"VEJP*OQVU/PEFΛଞͷϊʔυͱܨ͛Δ͜ͱͰɺ*OQVU/PEF͔ΒͷೖྗΛड͚औΔ͜ͱ͕Ͱ͖Δ
    AVAudioInputNode
43. AVAudioEngine 1MBZFS
    /PEF .JYFS
    /PEF 0VUQVU
    /PEF *OQVU
    /PEF
44. w "7"VEJP.JYFS/PEF͸ɺෳ਺ͷೖྗΛϛοΫεͯ͠ɺͭͷग़ྗʹม׵͢Δ
    w "7"VEJP.JYFS/PEF͸ɺ҉໧తʹݺ͹ΕΔͷͰফ͢͜ͱ͸Ͱ͖ͳ͍
    w .JYFS/PEFʹೖྗ͢Δ΋ͷ͸ϑΥʔϚοτ͕ͦΕͧΕҟͳ͍ͬͯͯ΋໰୊ͳ͍
    AVAudioMixerNode
45. AVAudioEngine 1MBZFS
    /PEF .JYFS
    /PEF 0VUQVU
    /PEF *OQVU
    /PEF
46. w "7"VEJP0VUQVU/PEF͸ɺϋʔυ΢ΣΞʹग़ྗ͢ΔϊʔυͰ͋Δ
    w "7"VEJP0VUQVU/PEF΋҉໧తʹݺ͹ΕΔͨΊɺফ͢͜ͱ͕Ͱ͖ͳ͍
    w ϛϡʔτ͍ͨͨ͠Ίʹ0VUQVU/PEFΛ֎͢͜ͱ͸Ͱ͖ͳ͍͕ɺϛϡʔτΛ࣮૷͢Δ͜ͱ͸Ͱ͖Δʢޙड़ʣ
    AVAudioOutputNode
47. w "7"VEJP/PEF͸ɺ͜ΕΒҎ֎ʹ΋Ի੠ʹ༷ʑͳΤϑΣΫτΛ͔͚Δ͜ͱ͕Ͱ͖Δ
    Audio Enhancements
48. w "7"VEJP6OJU3FWFSC
    w "7"VEJP6OJU5JNF&GGFDU
    w "7"VEJP6OJU5JNF1JUDI
    w "7"VEJP6OJU7BSJTQFFE
    w "7"VEJP6OJU&GGFDU
    w "7"VEJP6OJU%FMBZ
    w "7"VEJP6OJU%JTUPSUJPO
    w "7"VEJP6OJU&2 Audio Enhancements
49. Examples 6.
50. ͔͜͜Β͸"7"VEJP&OHJOFͷجຊతͳ࢖͍ํʹֶ͍ͭͯΜͰ͍͖·͠ΐ͏ɻ
    ࠓճ࢖͏ͷ͸σΟετʔγϣϯͱϦόʔϒͰ͢ɻ
    جຊతͳ࢖͍ํ
51. جຊతͳ࢖͍ํ ·ͣ͸"7"VEJP4FTTJPOΛηοτΞοϓ͠·͠ΐ͏ɻ*0#VGGFS%VSBUJPOΛઃఆ͢Δ͜ͱͰɺϩʔςϯγʔͰऔಘ ͢Δ͜ͱ͕ՄೳʹͳΓ·͢ɻ
    
52. جຊతͳ࢖͍ํ "7"VEJP&OHJOFͱ֤/PEFͷηοτΞοϓΛ͍͖ͯ͠·͠ΐ͏ɻBUUBDI͸͓๨Εͳ͘ɻ
53. جຊతͳ࢖͍ํ Ξλον͞Εͨϊʔυ͸࠷ޙʹ઀ଓΛߦ͍·͢ɻͦͷޙɺ"7"VEJP&OHJOFΛελʔτͤ͞ΔͱɺεϐʔΧʔ͔ ΒԻ͕ྲྀΕΔ͸ͣͰ͢ɻ
54. ೚ҙͷԻ੠ϑΝΠϧΛ࠶ੜ͢Δ ࠓ౓͸೚ҙͷϑΝΠϧΛ࠶ੜͯ͠Έ·͠ΐ͏ɻϑΝΠϧΛ࠶ੜ͢Δʹ͸·ͣ"7"VEJP'JMFΛ࡞Δඞཁ͕͋Γ· ͢ɻ
55. ೚ҙͷԻ੠ϑΝΠϧΛ࠶ੜ͢Δ Ի੠ϑΝΠϧΛ࠶ੜ͢Δʹ͸"7"VEJP1MBZFS/PEFΛ࢖͍·͢ɻઌ΄Ͳͱಉ༷ʹΞλονͯ͠ܨ͗ࠐΈ·͢ɻ
    ͦͷޙɺઌ΄Ͳ࡞ͬͨTPVSDF'JMFΛQMBZFSͷTDIFEVMF'JMFΛ࢖ͬͯɺϑΝΠϧΛಡΈࠐΈɺ࠶ੜ͠·͢ɻ
56. ֤/PEFͰ͸ɺJOTUBMM5BQͰϊʔυͷग़ྗΛ؂ࢹ͢Δ͜ͱ͕Ͱ͖·͢
    ͜ͷͱ͖ɺग़ྗόε΍όοϑΝαΠζɺϑΥʔϚοτΛࢦఆ͢Δ͜ͱ͕ՄೳͰ͢
    installTap
57. ઌ΄ͲͷJOTUBMM5BQΛ࢖ͬͯɺ"7"VEJP'JMFʹॻ͖ࠐΜͰΈ·͠ΐ͏ɻࠓճ͸ܾΊΒΕͨϑΥʔϚοτͰग़ྗ͢ ΔΑ͏ʹઃఆ͠·͢ɻ
    AVAudioFileʹॻ͖ࠐΉ
58. "7"VEJP&OHJOF͸ɺग़ྗ͕҉໧తʹݺ͹ΕΔͨΊɺͦͷ··ͩͱεϐʔΧʔ͔ΒԻ͕ྲྀΕͯ͠·͍·͢ɻ
    ͜ΕΛ๷͙ͨΊʹ"7"VEJP.JYFS/PEFΛ׆༻ͯ͠ɺϛϡʔτΛ࣮૷ͯ͠Έ·͠ΐ͏ɻ
    ԻΛग़ྗ͠ͳ͍Α͏ʹ͢Δ
59. ԻΛग़ྗ͠ͳ͍Α͏ʹ͢Δ .JYFS/PEFΛͭ࡞Γ·͢
    PVUQVU.JYFS͸JOTUBMM5BQΛ࢖͍ɺԻ੠ͷόοϑΝΛͱΔͨΊʹ࢖͍·͢
    NVUF.JYFS͸ɺԻ͕εϐʔΧʔʹग़ྗ͠ͳ͍ͨΊʹ༻ҙͨ͠μϛʔͷϛΩαʔͰ͢
60. ԻΛग़ྗ͠ͳ͍Α͏ʹ͢Δ Ξλονͯ͠ܨ͗ࠐΈ·͢ɻ͜ͷͱ͖ॱ൪͕େࣄͰ͢ɻ
    ઌʹPVUQVU.JYFSΛܨ͗ࠐΈɺ࠷ޙʹNVUF.JYFSΛܨ͗ࠐΈ·͢ɻ͜͏͢Δ͜ͱͰɺεϐʔΧʔ͔Β͸ NVUF.JYFSͷԻ͕ग़ΔͨΊɺແԻʹͳΓ·͢ɻ
61. JOTUBMM5BQΛ׆༻͢Δ͜ͱͰɺ3.4Λऔಘ͢Δ͜ͱ͕Ͱ͖·͢ɻ3.4Λऔಘ͢Δͱɺ༷ʑͳγʔϯͰ׆༻͢Δ͜ ͱ͕Ͱ͖·͢ɻ
    RMSΛऔಘ͢Δ
62. JOTUBMM5BQͰɺ"7"VEJP1$.#VGGFS͕΍͖ͬͯ·͢ɻ"7"VEJP1$.#VGGFS͔ΒGMPBU$IBOOFM%BUBΛऔΓग़ ͠ɺDIBOOFM%BUB7BMVFʹೖΕ·͢ɻ͜ͷ഑ྻ͸6OTBGF.VUBCMF1PJOUFS'MPBUͰ͋ΔͨΊɺ'MPBUͷ഑ྻʹ ม׵͠·͢ɻ'MPBUͷ഑ྻʹͨ͠ޙɺ3.4ͷܭࢉΛ͠·͢ɻ·ͣ഑ྻͷ஋Λೋ৐͠଍͠߹Θͤ·͢ɻͦͷ߹ܭ஋Λ όοϑΝαΠζͰׂΓɺฏํࠜΛٻΊΔͱ3.4͕ٻΊΒΕ·͢ɻ RMSΛऔಘ͢Δ
63. ϘίʔμʔϥΠϒϥϦͷ8PSMEΛ࢖ͬͯɺ"7"VEJP&OHJOF͔Βऔ͖ͬͯͨόοϑΝ͔Βϐονγϑτͯ͠Έ· ͠ΐ͏ɻ
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    WOLRDͰϘΠενΣϯδϟʔΛ࣮૷ͯ͠ΈΔ
64. 8PSME͕ೖྗ͢ΔϑΥʔϚοτ͕'MPBUͷ഑ྻʹରͯ͠ɺJ04Ͱ͸'MPBU͔͠औΕ·ͤΜɻͦͷͨΊɺϑΥʔ ϚοτΛม׵͢Δඞཁ͕͋Γ·͢ɻ
    WOLRDͰϘΠενΣϯδϟʔΛ࣮૷ͯ͠ΈΔ
65. $POWFSUFSΫϥεͰ͸ɺ"7"VEJP1$.#VGGFSΛ"7"VEJP$POWFSUFSΛ࢖ͬͯɺผͷϑΥʔϚοτʹม׵͍ͯ͠ ·͢ɻ
    WOLRDͰϘΠενΣϯδϟʔΛ࣮૷ͯ͠ΈΔ
66. $POWFSUFSΫϥεͰ͸ɺ"7"VEJP1$.#VGGFSΛ"7"VEJP$POWFSUFSΛ࢖ͬͯɺผͷϑΥʔϚοτʹม׵͍ͯ͠ ·͢ɻ
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67. JOTUBMM5BQΑΓ΍͖ͬͯͨόοϑΝʔΛ"7"VEJP$POWFSUFSͰɺ'MPBUʹม׵͠ɺ8PSMEͷύϥϝʔλΛ࢖͍ɺϐο νγϑτΛ͔͚ɺͦΕΛ'MPBUʹ໭ͯ͠ɺ"7"VEJP1MBZFS/PEFͷTDIFEVMF#VGGFSΛ࢖ͬͯ࠶ੜ͠·͢ɻ
    WOLRDͰϘΠενΣϯδϟʔΛ࣮૷ͯ͠ΈΔ
68. "7"VEJP&OHJOFͰ͸ɺجຊతʹ3FNPUF
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72. ManualRenderingͰVPIOΛ༗ޮʹ͢Δ #64͕ग़ྗɺ#64͕ೖྗͰ͢ɻ
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