MediaCodecで動画編集をしてみよう

.FEJB$PEFDͰಈըฤूΛͯ͠ΈΑ͏ %SPJE,BJHJ EBBTVV

ॳొஃʂʂ

ࣗݾ঺հ $$IBOOFMגࣜձࣾ "OESPJE&OHJOFFS݉1. ਢాխ೭ ʮNZTUBʯΤϯλϝಈըΞϓϦ ʮ4PEBʯಈըฤूΞϓϦ .BTBZVLJ4VEB EBBTVV

ࠓ೔ͷΰʔϧ "OESPJEΞϓϦΛ࡞ΕΔਓ͕ɺ .FEJB$PEFDͰϑΟϧλʔ͕͔͔ͬͨΓɺ ΢ΥʔλʔϚʔΫΛ͚ͭͨಈըΛ࡞ΕΔͷʹ ඞཁͳٕज़Λཧղ͢Δɻ

.Q$PNQPTFSBOESPJE ɾ؆୯ʹ.QʹϑΟϧλʔ΍΢ΥʔλʔϚʔΫ ɹ͕͚ͭΒΕΔ ɾຊ೔࿩ͨ͠಺༰ͷಈ͘αϯϓϧʹ IUUQTHJUIVCDPN.BTBZVLJ4VEB.Q$PNQPTFSBOESPJE

// ΢ΥʔλʔϚʔΫ new Mp4Composer(srcMp4Path, destMp4Path) .filter( new GlWatermarkFilter(watermarkBitmap, Position.RIGHT_BOTTOM) )
.start(); // ηϐΞϑΟϧλʔ new Mp4Composer(srcMp4Path, destMp4Path) .filter(new GlSepiaFilter()) .start(); .Q$PNQPTFSBOESPJE IUUQTHJUIVCDPN.BTBZVLJ4VEB.Q$PNQPTFSBOESPJE

໨࣍ ᶃಈըͱ͸ ᶄಈըฤूͷجૅ஌ࣝ ᶅ.FEJB$PEFDͷϙΠϯτ ᶆ0QFO(-&4ͷϙΠϯτ ᶇಈըʹϑΟϧλʔΛ͔͚Δ ᶈಈըʹ΢ΥʔλʔϚʔΫΛ͚ͭΔ ᶉ࠷ޙʹ

ಈըͱ͸Իʴө૾ ᶃಈըͱ͸ ը૾ग़యɹ"WJ6UJMͷқ͍͠࢖͍ํ  ɹIUUQBWJVUMJOGPEPVHBLFJTJLJLPOOUFOB

ө૾ͱ͸ը૾ͷू߹ମ ը૾ग़యɹ"WJ6UJMͷқ͍͠࢖͍ํ  ɹIUUQBWJVUMJOGPEPVHBLFJTJLJLPOOUFOB ᶃಈըͱ͸

ᶄಈըฤूͷجૅ஌ࣝ ಈըฤूͰ͓͍͑ͨ͞༻ޠͭ ᶃ&ODPEF ᶄ$PEFD ɹ ᶅ%FDPEF ᶆ.VYFS

ɾѹॖΛͯ͠ɺಈըϑΝΠϧΛখ͘͢͞Δߦҝɻ ɾө૾͸ը૾ͷू߹ମɻGQTͰ෼ͷಈըͩͱ ຕͷը૾ʹͳΔɻ୯७ʹͦͷ··ॲཧΛ ͯ͠͠·͏ͱɺ๲େͳ༰ྔʹͳͬͯ͠·͏ɻ ͦΕΛ๷͙ ಈըฤूͰͷ༻ޠͭ ᶃ&ODPEF ᶄಈըฤूͷجૅ஌ࣝ

ᶄ$PEFD ɾ&ODPEF ѹॖ ͢ΔࡍͷΞϧΰϦζϜ ɾ).1&("7$౳ͷ͜ͱΛࢦ͢ ɾ"OESPJEҎ߱ɺ.FEJB$PEFD͸) ɹʹ΄΅શ୺ରԠ ಈըฤूͰͷ༻ޠͭ ᶄಈըฤूͷجૅ஌ࣝ

ಈըฤूͰͷ༻ޠ ᶅ%FDPEF ɾ&ODPEF ѹॖ ͞ΕͨಈըΛ෮ݩ͢Δߦҝ ɾಈը࠶ੜ͸ಈըϑΝΠϧΛ%FDPEFΛ ɹ͞Εͯ࠶ੜ͞Ε͍ͯΔ ᶄಈըฤूͷجૅ஌ࣝ

ಈըฤूͰͷ༻ޠ ᶆ.VYFS ɾΤϯίʔυͨ͠ʮө૾ʯͱʮԻ੠ʯΛͭͷ ɹಈըϑΝΠϧͱͯ͠·ͱΊΔ ᶄಈըฤूͷجૅ஌ࣝ

ɾಈըΛ%FDPEF͢Δɺը૾ʹల։͢Δɻ ɹˣ ɾల։ͨ͠ը૾ʹϑΟϧλʔΛ͔͚Δ ɹˣ ɾฤूͨ͠ը૾Λ&ODPEF ѹॖ ͯ͠ө૾ʹ͢Δ ɹˣ ɾ&ODPEFͨ͠ө૾ͱԻΛಈըϑΝΠϧʹ͢Δ ɹ
.VYFS ಈըʹϑΟϧλʔΛ͔͚ΔTUFQ ᶄಈըฤूͷجૅ஌ࣝ

ᶃ.FEJB&YUSBDUPSͰը૾Λ̍ຕ̍ຕऔΓग़͢ ᶄ.FEJB&YUSBDUPS͔Βड͚औͬͨσʔλΛ%FDPEFSͰ4VSGBDF5FYUVSF ʹ͠ɺͦ͜ʹϑΟϧλʔΛ͔͚Δɻ&ODPEFSͰ༻ҙͨ͠(-$POUFYUʹඳըɻ ᶅ.FEJB.VYFSͰ.1ϑΝΠϧʹ͢Δɻ ᶅ.FEJB$PEFDͷϙΠϯτ ը૾࡞੒ࢀߟݩɹ "OESPJEͰ.FEJB$PEFDΛ࢖͍''NQFHͳ͠ͰಈըΛѹॖ͢Δํ๏ʢϥΠϒϥϦ͋Γʣɹ IUUQTRJJUBDPNZVZB@QSFTUPJUFNTEFDCE .1 .FEJB
&YUSBDUPS .FEJB$PEFD %FDPEFS 0QFO(-&4$POUFYU 'JMUFS %FDPEFS4VSGBDF &ODPEFS4VSGBDF .FEJB$PEFD &ODPEFS .FEJB .VYFS .1 4VSGBDF5FYUVSF 4XBQ#V⒎FS ESBX #ZUF#V⒎FS #ZUF#V⒎FS .Q$PNQPTFSͷΞʔΩςΫνϟ

ᶅ.FEJB$PEFDͷϙΠϯτ ͭͷओཁ$MBTTΛ૊Έ߹ΘͤͯಈըฤूΛߦ͏ ɾ.FEJB&YUSBDUPS ɾ.FEJB$PEFD ɾ.FEJB.VYFS

ᶅ.FEJB$PEFDͷϙΠϯτ ɾ.FEJB&YUSBDUPS ɹ໾ׂͱͯ͠͸%FDPEFͷҰ෦Λ୲͏ɻ ɹ ɹฤूݩͷಈը͔ΒԻσʔλͱө૾ຕຕΛ#ZUF#V⒎FS Ͱ.FEJB$PEFDʹ౉͢ɻ ɹ.FEJB$PEFDͰѻ͑ΔҰ୯Ґ TBNQMF ͣͭ౉͠·͢ɻ

ᶅ.FEJB$PEFDͷϙΠϯτ ɾ.FEJB$PEFD ɹ໾ׂͱͯ͠͸%FDPEFͷҰ෦ͱ&ODPEFΛ୲͏ ɹ%FDPEFͱ&ODPEF͸ͦΕͧΕผͷΠϯελϯεͰ୲͏ɻ ɹ ɹ.FEJB&YUSBDUPS͔Βड͚औͬͨ#ZUF#V⒎FSΛ ɹ%FDPEF͢ΔΠϯελϯεͰडऔɺ0QFO(-&4 5FYUVSF 4VSGBDF5FYUVSF ͱͯ͠ల։͢Δɻ
ɹ&ODPEF͢ΔΠϯελϯεͰ༻ҙͨ͠(-$POUFYUͰ ɹ5FYUVSFΛඳը͢Δɻ

ᶅ.FEJB$PEFDͷϙΠϯτ ɾ.FEJB.VYFS .FEJB$PEFD͔Βฤू͞ΕͨԻɺө૾Λ#ZUF#V⒎FSͰ ɹडऔɺҰͭͷϑΝΠϧίϯςφΛੜ੒͢Δɻ ɹ

.FEJB&YUSBDUPSͷ େࡶ೺ͳίʔυͷྲྀΕ // Πϯελϯεੜ੒ mediaExtractor = new MediaExtractor(); // ಈըฤूݩͷϑΝΠϧΛFileDescriptorܗࣜͰηοτ͢Δɻ
mediaExtractor.setDataSource(inputFileDescriptor); // Decoder(MediaCodec)ͷ࡞੒ MediaFormat inputFormat = mediaExtractor.getTrackFormat(trackIndex); decoder = MediaCodec.createDecoderByType(inputFormat.getString(MediaFormat.KEY_MIME)); // Decoderʹ౉͢ByteBufferΛ࡞੒ decoderInputBuffers = decoder.getInputBuffers(); // sample (MediaCodecͰѻ͑Δ1୯Ґ)ͷαΠζΛऔಘ int result = decoder.dequeueInputBuffer(0); int sampleSize = mediaExtractor.readSampleData(decoderInputBuffers[result], 0); // DecoderʹDataΛ౉͢ boolean isKeyFrame = (mediaExtractor.getSampleFlags() & MediaExtractor.SAMPLE_FLAG_SYNC) != 0; decoder.queueInputBuffer(result, 0, sampleSize, mediaExtractor.getSampleTime(), isKeyFrame ? MediaCodec.BUFFER_FLAG_SYNC_FRAME : 0); // ࣍ͷsampleσʔλʹਐΉ mediaExtractor.advance(); ᶅ.FEJB$PEFDͷϙΠϯτ

// MediaExtractor͔ΒडऔɺॲཧࡁΈͷOutput BufferΛऔಘ int result = decoder.dequeueOutputBuffer(bufferInfo, 0); // 2ͭΊͷҾ਺͸SurfaceʹtextureΛඳը͢Δ͔Ͳ͏͔
decoder.releaseOutputBuffer(result, true); // ඳը͞Εͨtextureͷ౸ண଴ͪ decoderSurface.awaitNewImage(); // textureΛOpenGLͰඳը decoderSurface.drawImage(); // ඳը͞ΕΔ࣌ؒΛࢦఆ encoderSurface.setPresentationTime(bufferInfo.presentationTimeUs * 1000); // ݱࡏඳը͞Ε͍ͯΔ಺༰ΛEncoderʹૹ৴ encoderSurface.swapBuffers(); // encoderͰඳը৘ใΛडऔΔ encoder.dequeueOutputBuffer(bufferInfo, 0); encoderOutputBuffers = encoder.getOutputBuffers(); // encoderͷoutputBufferΛMediaMuxerʹ౉ͯ͠ɺmp4ϑΝΠϧʹ͢Δ muxRender.writeSampleData(MuxRender.SampleType.VIDEO, encoderOutputBuffers[result], bufferInfo); ᶅ.FEJB$PEFDͷϙΠϯτ .FEJB$PEFDɹ.FEJB.VYFSͷ େࡶ೺ͳίʔυͷྲྀΕ

.1 .FEJB &YUSBDUPS .FEJB$PEFD %FDPEFS 0QFO(-&4$POUFYU 'JMUFS %FDPEFS4VSGBDF &ODPEFS4VSGBDF .FEJB$PEFD
&ODPEFS .FEJB .VYFS .1 4VSGBDF5FYUVSF 4XBQ#V⒎FS ESBX #ZUF#V⒎FS #ZUF#V⒎FS ᶆ0QFO(-&4ͷϙΠϯτ

ᶆ0QFO(-&4ͷϙΠϯτ ɾ0QFO(-&4ͱ͸ɺ0QFO(-ͷܞଳ୺຤޲͚ͷαϒηοτ൛ɻ ,ISPOPT(SPVQ͕࢓༷ࡦఆ ɾ(16ͷ֤ԋࢉϢχοτ͸શ͘ಉ͡ϓϩάϥϜΛҟͳΔσʔλ ʹରͯ͠ฒྻ࣮ߦ͠·͢ɻ ɾෳࡶͳӄӨॲཧ΍ඳըΤϑΣΫτͷࡍɺ(16ͷࢧԉʹΑͬͯ ɹ࣮ߦ͍ͯͨ͘͠ΊɺϚϧνίΞ$16ΑΓ΋༏Εͨ ɹύϑΥʔϚϯεΛൃش

ᶆ0QFO(-&4ͷϙΠϯτ ϑΟϧλʔΛ͔͚ΔશͯͷϐΫηϧʹॲཧΛՃ͑Δ

ᶆ0QFO(-&4ͷϙΠϯτ ը૾ग़యɹϚΠφϏχϡʔε  %άϥϑΟοΫɾϚχΞοΫε  ɹIUUQTOFXTNZOBWJKQBSUJDMFHSBQIJDT 0QFO(-&4Ͱͷඳը·ͰͷྲྀΕ ௖఺৘ใΛ༻ҙ %σΟεϓϨΠͷͲ͜ʹඳը͢ΔҐஔͷܾఆ ֤ϐΫηϧຖͷ৭Λܾఆ

ᶆ0QFO(-&4ͷϙΠϯτ 0QFO(-&4Ͱͷඳը·ͰͷྲྀΕ ௖఺৘ใΛ༻ҙ private final float[] triangleVerticesData = { //
X, Y, Z, U, V -1.0f, -1.0f, 0, 0.f, 0.f, 1.0f, -1.0f, 0, 1.f, 0.f, -1.0f, 1.0f, 0, 0.f, 1.f, 1.0f, 1.0f, 0, 1.f, 1.f, };

(-1,1,0) +y +x (1,1,0) (1,-1,0) (-1,-1,0) +z (0,0) (1,0) (0,1)
67࠲ඪ ௖఺࠲ඪ ᶆ0QFO(-&4ͷϙΠϯτ 0QFO(-&4Ͱͷඳը·ͰͷྲྀΕ ௖఺৘ใΛ༻ҙ ը૾࡞੒ࢀߟݩɹ ͚Μ͝ͷ͓԰ෑɹςΫενϟϚοϐϯά IUUQULFOHPHJUIVCJPCMPHPQFOHMFTELOPXMFEHF

ᶆ0QFO(-&4ͷϙΠϯτ 7FSUFY4IBEFSͰߦ͏ 0QFO(-&4Ͱͷඳը·ͰͷྲྀΕ %σΟεϓϨΠͷͲ͜ʹඳը͢ΔҐஔͷܾఆ

7FSUFY4IBEFS VOJGPSNNBUV.71.BUSJY֦େճసͳͲͷม׵࠲ඪ VOJGPSNNBUV45.BUSJYσίʔυͨ͠ςΫενϟͷߦྻ BUUSJCVUFWFDB1PTJUJPOY Z [ͷ࠲ඪ BUUSJCVUFWFDB5FYUVSF$PPSEV W࠲ඪ WBSZJOHWFDW5FYUVSF$PPSE'SBHNFOU4IBEFSʹ౉͢࠲ඪ WPJENBJO
\ HM@1PTJUJPOV.71.BUSJY B1PTJUJPO W5FYUVSF$PPSE V45.BUSJY B5FYUVSF$PPSE YZ ^ ᶆ0QFO(-&4ͷϙΠϯτ ɾม׵ߦྻͱ௖఺࠲ඪΛܭࢉ͠ɺ௖఺ҐஔΛܾఆ ɾςΫενϟͷ67࠲ඪͷܾఆΛ'SBHNFOU4IBEFS΁౉͢

ᶆ0QFO(-&4ͷϙΠϯτ ม׵ߦྻͱ͸ ը૾ग़య͚Μ͝ͷ͓԰ෑɹ όʔςοΫεγΣʔμʹΑΔ࠲ඪܥม׵ɹ IUUQULFOHPHJUIVCJPCMPHPQFOHMFTELOPXMFEHF

ᶆ0QFO(-&4ͷϙΠϯτ ม׵ߦྻͱ͸ private float[] MVPMatrix = new float[16]; // ୯Ґߦྻͷੜ੒
Matrix.setIdentityM(MVPMatrix, 0); // ฒߦҠಈ Matrix.translateM(MVPMatrix, 0, x:0, y:0, z:0f); // ֦େɾॖখ Matrix.scaleM(MVPMatrix, 0, x:1, y:1, z:1); // ճస Matrix.rotateM(MVPMatrix, 0, rotation:0, x:0.f, y:0.f, z:1.f);

ᶆ0QFO(-&4ͷϙΠϯτ 'SBHNFOU4IBEFS ৭Λมߋ͢ΔϑΟϧλʔ΍ɺ΢ΥʔλʔϚʔΫ΋ ͜͜Ͱͷॲཧ͢Δ͕伴ʹͳΔɻ ֤ϐΫηϧຖͷ৭Λܾఆ 0QFO(-&4Ͱͷඳը·ͰͷྲྀΕ

'SBHNFOU4IBEFS FYUFOTJPO(-@0&4@&(-@JNBHF@FYUFSOBMSFRVJSF QSFDJTJPONFEJVNQqPBU WBSZJOHWFDW5FYUVSF$PPSEWFSUFYTIBEFS VOJGPSNTBNQMFS&YUFSOBM0&4T5FYUVSFಈը͔Βσίʔυ͞Εͨը૾ WPJENBJO \ HM@'SBH$PMPSUFYUVSF% T5FYUVSF W5FYUVSF$PPSE
^ ᶆ0QFO(-&4ͷϙΠϯτ ɾ౉͖ͬͯͨ67࠲ඪʹ5FYUVSF͔Β5FYFMΛऔΓग़͠ɺ ɹϥελϥΠζิ׬͞Εͨ৭Λඳը͢Δ

ᶆ0QFO(-&4ͷϙΠϯτ ௖఺৘ใΛ৭৘ใʹ౉͢ڮ౉͠ɻ ҙࣝ͠ͳͯ͘΋ϓϩάϥϛϯάͰ͖Δɻ ϥελϥΠζ ը૾ग़యɹϚΠφϏχϡʔε  %άϥϑΟοΫɾϚχΞοΫε  ɹIUUQTOFXTNZOBWJKQBSUJDMFHSBQIJDT 0QFO(-&4Ͱͷඳը·ͰͷྲྀΕ

.1 .FEJB &YUSBDUPS .FEJB$PEFD %FDPEFS 0QFO(-&4$POUFYU 'JMUFS %FDPEFS4VSGBDF &ODPEFS4VSGBDF .FEJB$PEFD
&ODPEFS .FEJB .VYFS .1 4VSGBDF5FYUVSF 4XBQ#V⒎FS ESBX #ZUF#V⒎FS #ZUF#V⒎FS ᶆ0QFO(-&4ͷϙΠϯτ ᶃ%FDPEFS4VSGBDFͰ4VSGBDF5FYUVSFͱͯ͠ը૾Λड͚औΔɻ 4DBMF΍ճస༻ͷม׵ߦྻΛ؅ཧɻ ᶄ'JMUFSͰ4VSGBDF5FYUVSFʹ৭Λ͚ͭͨΓɺ΢ΥʔλʔϚʔΫΛ͚ͭͨΓ͢Δ ᶅ&ODPEFS4VSGBDFͰ.FEJB$PEFDͷ&ODPEFʹॻ͖ࠐΈΛߦ͏

// ඳը͞Εͨtextureͷ౸ண଴ͪ decoderSurface.awaitNewImage(); // textureΛOpenGLͰඳը ಺෦ͰFilter͕drawΛߦͬͯ·͢ɻ decoderSurface.drawImage(); // ඳը͞ΕΔ࣌ؒΛࢦఆ encoderSurface.setPresentationTime(bufferInfo.presentationTimeUs
* 1000); // ݱࡏඳը͞Ε͍ͯΔ಺༰ΛEncoderʹૹ৴ encoderSurface.swapBuffers(); // encoderͰඳը৘ใΛडऔΔ encoder.dequeueOutputBuffer(bufferInfo, 0); encoderOutputBuffers = encoder.getOutputBuffers(); // encoderͷoutputBufferΛMediaMuxerʹ౉ͯ͠ɺmp4ϑΝΠϧʹ͢Δ muxRender.writeSampleData(MuxRender.SampleType.VIDEO, encoderOutputBuffers[result], bufferInfo); ᶆ0QFO(-&4ͷϙΠϯτ %FDPEFS4VSGBDFͱ&ODPEFS 4VSGBDFͷେࡶ೺ͳίʔυͷྲྀΕ

4VSGBDF5FYUVSFͱ͸ ᶆ0QFO(-&4ͷϙΠϯτ ɾ%FDPEF͞Εͨը૾Λ0QFO(-&4ςΫενϟ ɹͱͯ͠ϑϨʔϜΛΩϟϓνϟ͠·͢ɻ ɾ"OESPJEͷ4VSGBDF5FYUVSF͸%ςΫενϟͰ͸ͳ͍ ɾΧϝϥϓϨϏϡʔͷετϦʔϜͰ΋࢖༻͞Ε͍ͯΔ

ᶇಈըʹϑΟϧλʔΛ͔͚Δ ಈըʹϑΟϧλʔΛ͔͚Δ ˣ QJYFM͝ͱͷ৭Λ'SBHNFOU4IBEFSͰมߋ͢Δ

(MBZ4DBMFͷ'SBHNFOU4IBEFS FYUFOTJPO(-@0&4@&(-@JNBHF@FYUFSOBMSFRVJSF QSFDJTJPONFEJVNQqPBU WBSZJOHWFDW5FYUVSF$PPSE VOJGPSNTBNQMFS&YUFSOBM0&4T5FYUVSF DPOTUIJHIQWFDXFJHIUWFD
WPJENBJO \ qPBUMVNJOBODFEPU UFYUVSF% T5FYUVSF W5FYUVSF$PPSE SHC XFJHIU HM@'SBH$PMPSWFD WFD MVNJOBODF ^ ᶇಈըʹϑΟϧλʔΛ͔͚Δ

4FQJBͷ'SBHNFOU4IBEFS FYUFOTJPO(-@0&4@&(-@JNBHF@FYUFSOBMSFRVJSF QSFDJTJPONFEJVNQqPBU WBSZJOHWFDW5FYUVSF$PPSE VOJGPSNTBNQMFS&YUFSOBM0&4T5FYUVSF WPJENBJO \ WFDGSBH$PMPSUFYUVSF% T5FYUVSF W5FYUVSF$PPSE
HM@'SBH$PMPSSEPU GSBH$PMPSSHC WFD HM@'SBH$PMPSHEPU GSBH$PMPSSHC WFD HM@'SBH$PMPSCEPU GSBH$PMPSSHC WFD ^ ᶇಈըʹϑΟϧλʔΛ͔͚Δ

ᶈಈըʹ΢ΥʔλʔϚʔΫΛ͚ͭΔ ɾ΢ΥʔλʔϚʔΫͷ#JUNBQΛ0QFO(-ʹૹΔ ɾ'SBHNFOU4IBEFSͰBMQIB߹੒Λߦ͏

ᶈಈըʹ΢ΥʔλʔϚʔΫΛ͚ͭΔ #JUNBQΛ0QFO(-ʹૹΔ ը૾ग़య͚Μ͝ͷ͓԰ෑɹ ςΫενϟϚοϐϯάɹ IUUQULFOHPHJUIVCJPCMPHPQFOHMFTELOPXMFEHF

ᶈಈըʹ΢ΥʔλʔϚʔΫΛ͚ͭΔ ը૾ग़య͚Μ͝ͷ͓԰ෑɹ ςΫενϟϚοϐϯάɹ IUUQULFOHPHJUIVCJPCMPHPQFOHMFTELOPXMFEHF

'SBHNFOU4IBEFSͰΞϧϑΝ߹੒ FYUFOTJPO(-@0&4@&(-@JNBHF@FYUFSOBMSFRVJSF QSFDJTJPONFEJVNQqPBU WBSZJOHWFDW5FYUVSF$PPSE VOJGPSNTBNQMFS&YUFSOBM0&4T5FYUVSF VOJGPSNMPXQTBNQMFS%P5FYUVSFΞοϓϩʔυͨ͠UFYUVSF WPJENBJO \ MPXQWFDDUFYUVSF% T5FYUVSF
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MediaCodecで動画編集をしてみよう

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