1 /* 2 * Copyright (C) 2013 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package android.media; 18 19 import android.annotation.IntDef; 20 import android.annotation.NonNull; 21 import android.annotation.UnsupportedAppUsage; 22 import android.media.MediaCodec; 23 import android.media.MediaCodec.BufferInfo; 24 25 import dalvik.system.CloseGuard; 26 27 import java.io.FileDescriptor; 28 import java.io.IOException; 29 import java.io.RandomAccessFile; 30 import java.lang.annotation.Retention; 31 import java.lang.annotation.RetentionPolicy; 32 import java.nio.ByteBuffer; 33 import java.util.Map; 34 35 /** 36 * MediaMuxer facilitates muxing elementary streams. Currently MediaMuxer supports MP4, Webm 37 * and 3GP file as the output. It also supports muxing B-frames in MP4 since Android Nougat. 38 * <p> 39 * It is generally used like this: 40 * 41 * <pre> 42 * MediaMuxer muxer = new MediaMuxer("temp.mp4", OutputFormat.MUXER_OUTPUT_MPEG_4); 43 * // More often, the MediaFormat will be retrieved from MediaCodec.getOutputFormat() 44 * // or MediaExtractor.getTrackFormat(). 45 * MediaFormat audioFormat = new MediaFormat(...); 46 * MediaFormat videoFormat = new MediaFormat(...); 47 * int audioTrackIndex = muxer.addTrack(audioFormat); 48 * int videoTrackIndex = muxer.addTrack(videoFormat); 49 * ByteBuffer inputBuffer = ByteBuffer.allocate(bufferSize); 50 * boolean finished = false; 51 * BufferInfo bufferInfo = new BufferInfo(); 52 * 53 * muxer.start(); 54 * while(!finished) { 55 * // getInputBuffer() will fill the inputBuffer with one frame of encoded 56 * // sample from either MediaCodec or MediaExtractor, set isAudioSample to 57 * // true when the sample is audio data, set up all the fields of bufferInfo, 58 * // and return true if there are no more samples. 59 * finished = getInputBuffer(inputBuffer, isAudioSample, bufferInfo); 60 * if (!finished) { 61 * int currentTrackIndex = isAudioSample ? audioTrackIndex : videoTrackIndex; 62 * muxer.writeSampleData(currentTrackIndex, inputBuffer, bufferInfo); 63 * } 64 * }; 65 * muxer.stop(); 66 * muxer.release(); 67 * </pre> 68 * 69 70 <h4>Metadata Track</h4> 71 <p> 72 Per-frame metadata is useful in carrying extra information that correlated with video or audio to 73 facilitate offline processing, e.g. gyro signals from the sensor could help video stabilization when 74 doing offline processing. Metadata track is only supported in MP4 container. When adding a new 75 metadata track, track's mime format must start with prefix "application/", e.g. "applicaton/gyro". 76 Metadata's format/layout will be defined by the application. Writing metadata is nearly the same as 77 writing video/audio data except that the data will not be from mediacodec. Application just needs 78 to pass the bytebuffer that contains the metadata and also the associated timestamp to the 79 {@link #writeSampleData} api. The timestamp must be in the same time base as video and audio. The 80 generated MP4 file uses TextMetaDataSampleEntry defined in section 12.3.3.2 of the ISOBMFF to signal 81 the metadata's mime format. When using{@link android.media.MediaExtractor} to extract the file with 82 metadata track, the mime format of the metadata will be extracted into {@link android.media.MediaFormat}. 83 84 <pre class=prettyprint> 85 MediaMuxer muxer = new MediaMuxer("temp.mp4", OutputFormat.MUXER_OUTPUT_MPEG_4); 86 // SetUp Video/Audio Tracks. 87 MediaFormat audioFormat = new MediaFormat(...); 88 MediaFormat videoFormat = new MediaFormat(...); 89 int audioTrackIndex = muxer.addTrack(audioFormat); 90 int videoTrackIndex = muxer.addTrack(videoFormat); 91 92 // Setup Metadata Track 93 MediaFormat metadataFormat = new MediaFormat(...); 94 metadataFormat.setString(KEY_MIME, "application/gyro"); 95 int metadataTrackIndex = muxer.addTrack(metadataFormat); 96 97 muxer.start(); 98 while(..) { 99 // Allocate bytebuffer and write gyro data(x,y,z) into it. 100 ByteBuffer metaData = ByteBuffer.allocate(bufferSize); 101 metaData.putFloat(x); 102 metaData.putFloat(y); 103 metaData.putFloat(z); 104 BufferInfo metaInfo = new BufferInfo(); 105 // Associate this metadata with the video frame by setting 106 // the same timestamp as the video frame. 107 metaInfo.presentationTimeUs = currentVideoTrackTimeUs; 108 metaInfo.offset = 0; 109 metaInfo.flags = 0; 110 metaInfo.size = bufferSize; 111 muxer.writeSampleData(metadataTrackIndex, metaData, metaInfo); 112 }; 113 muxer.stop(); 114 muxer.release(); 115 }</pre> 116 117 <h2 id=History><a name="History"></a>Features and API History</h2> 118 <p> 119 The following table summarizes the feature support in different API version and containers. 120 For API version numbers, see {@link android.os.Build.VERSION_CODES}. 121 122 <style> 123 .api > tr > th, .api > tr > td { text-align: center; padding: 4px 4px; } 124 .api > tr > th { vertical-align: bottom; } 125 .api > tr > td { vertical-align: middle; } 126 .sml > tr > th, .sml > tr > td { text-align: center; padding: 2px 4px; } 127 .fn { text-align: center; } 128 </style> 129 130 <table align="right" style="width: 0%"> 131 <thead> 132 <tbody class=api> 133 <tr><th>Symbol</th> 134 <th>Meaning</th></tr> 135 </tbody> 136 </thead> 137 <tbody class=sml> 138 <tr><td>●</td><td>Supported</td></tr> 139 <tr><td>○</td><td>Not supported</td></tr> 140 <tr><td>▧</td><td>Supported in MP4/WebM/3GP</td></tr> 141 <tr><td>⁕</td><td>Only Supported in MP4</td></tr> 142 </tbody> 143 </table> 144 <table align="center" style="width: 100%;"> 145 <thead class=api> 146 <tr> 147 <th rowspan=2>Feature</th> 148 <th colspan="24">SDK Version</th> 149 </tr> 150 <tr> 151 <th>18</th> 152 <th>19</th> 153 <th>20</th> 154 <th>21</th> 155 <th>22</th> 156 <th>23</th> 157 <th>24</th> 158 <th>25</th> 159 <th>26+</th> 160 </tr> 161 </thead> 162 <tbody class=api> 163 <tr> 164 <td align="center">MP4 container</td> 165 <td>●</td> 166 <td>●</td> 167 <td>●</td> 168 <td>●</td> 169 <td>●</td> 170 <td>●</td> 171 <td>●</td> 172 <td>●</td> 173 <td>●</td> 174 </tr> 175 <td align="center">WebM container</td> 176 <td>○</td> 177 <td>○</td> 178 <td>○</td> 179 <td>●</td> 180 <td>●</td> 181 <td>●</td> 182 <td>●</td> 183 <td>●</td> 184 <td>●</td> 185 </tr> 186 <td align="center">3GP container</td> 187 <td>○</td> 188 <td>○</td> 189 <td>○</td> 190 <td>○</td> 191 <td>○</td> 192 <td>○</td> 193 <td>○</td> 194 <td>○</td> 195 <td>●</td> 196 </tr> 197 <td align="center">Muxing B-Frames(bi-directional predicted frames)</td> 198 <td>○</td> 199 <td>○</td> 200 <td>○</td> 201 <td>○</td> 202 <td>○</td> 203 <td>○</td> 204 <td>⁕</td> 205 <td>⁕</td> 206 <td>⁕</td> 207 </tr> 208 </tr> 209 <td align="center">Muxing Single Video/Audio Track</td> 210 <td>▧</td> 211 <td>▧</td> 212 <td>▧</td> 213 <td>▧</td> 214 <td>▧</td> 215 <td>▧</td> 216 <td>▧</td> 217 <td>▧</td> 218 <td>▧</td> 219 </tr> 220 </tr> 221 <td align="center">Muxing Multiple Video/Audio Tracks</td> 222 <td>○</td> 223 <td>○</td> 224 <td>○</td> 225 <td>○</td> 226 <td>○</td> 227 <td>○</td> 228 <td>○</td> 229 <td>○</td> 230 <td>⁕</td> 231 </tr> 232 </tr> 233 <td align="center">Muxing Metadata Tracks</td> 234 <td>○</td> 235 <td>○</td> 236 <td>○</td> 237 <td>○</td> 238 <td>○</td> 239 <td>○</td> 240 <td>○</td> 241 <td>○</td> 242 <td>⁕</td> 243 </tr> 244 </tbody> 245 </table> 246 */ 247 248 final public class MediaMuxer { 249 250 static { 251 System.loadLibrary("media_jni"); 252 } 253 254 /** 255 * Defines the output format. These constants are used with constructor. 256 */ 257 public static final class OutputFormat { 258 /* Do not change these values without updating their counterparts 259 * in include/media/stagefright/MediaMuxer.h! 260 */ OutputFormat()261 private OutputFormat() {} 262 /** @hide */ 263 public static final int MUXER_OUTPUT_FIRST = 0; 264 /** MPEG4 media file format*/ 265 public static final int MUXER_OUTPUT_MPEG_4 = MUXER_OUTPUT_FIRST; 266 /** WEBM media file format*/ 267 public static final int MUXER_OUTPUT_WEBM = MUXER_OUTPUT_FIRST + 1; 268 /** 3GPP media file format*/ 269 public static final int MUXER_OUTPUT_3GPP = MUXER_OUTPUT_FIRST + 2; 270 /** HEIF media file format*/ 271 public static final int MUXER_OUTPUT_HEIF = MUXER_OUTPUT_FIRST + 3; 272 /** Ogg media file format*/ 273 public static final int MUXER_OUTPUT_OGG = MUXER_OUTPUT_FIRST + 4; 274 /** @hide */ 275 public static final int MUXER_OUTPUT_LAST = MUXER_OUTPUT_OGG; 276 }; 277 278 /** @hide */ 279 @IntDef({ 280 OutputFormat.MUXER_OUTPUT_MPEG_4, 281 OutputFormat.MUXER_OUTPUT_WEBM, 282 OutputFormat.MUXER_OUTPUT_3GPP, 283 OutputFormat.MUXER_OUTPUT_HEIF, 284 OutputFormat.MUXER_OUTPUT_OGG, 285 }) 286 @Retention(RetentionPolicy.SOURCE) 287 public @interface Format {} 288 289 // All the native functions are listed here. 290 @UnsupportedAppUsage nativeSetup(@onNull FileDescriptor fd, int format)291 private static native long nativeSetup(@NonNull FileDescriptor fd, int format) 292 throws IllegalArgumentException, IOException; 293 @UnsupportedAppUsage nativeRelease(long nativeObject)294 private static native void nativeRelease(long nativeObject); nativeStart(long nativeObject)295 private static native void nativeStart(long nativeObject); nativeStop(long nativeObject)296 private static native void nativeStop(long nativeObject); nativeAddTrack( long nativeObject, @NonNull String[] keys, @NonNull Object[] values)297 private static native int nativeAddTrack( 298 long nativeObject, @NonNull String[] keys, @NonNull Object[] values); nativeSetOrientationHint( long nativeObject, int degrees)299 private static native void nativeSetOrientationHint( 300 long nativeObject, int degrees); nativeSetLocation(long nativeObject, int latitude, int longitude)301 private static native void nativeSetLocation(long nativeObject, int latitude, int longitude); nativeWriteSampleData( long nativeObject, int trackIndex, @NonNull ByteBuffer byteBuf, int offset, int size, long presentationTimeUs, @MediaCodec.BufferFlag int flags)302 private static native void nativeWriteSampleData( 303 long nativeObject, int trackIndex, @NonNull ByteBuffer byteBuf, 304 int offset, int size, long presentationTimeUs, @MediaCodec.BufferFlag int flags); 305 306 // Muxer internal states. 307 @UnsupportedAppUsage 308 private static final int MUXER_STATE_UNINITIALIZED = -1; 309 private static final int MUXER_STATE_INITIALIZED = 0; 310 @UnsupportedAppUsage 311 private static final int MUXER_STATE_STARTED = 1; 312 @UnsupportedAppUsage 313 private static final int MUXER_STATE_STOPPED = 2; 314 315 @UnsupportedAppUsage 316 private int mState = MUXER_STATE_UNINITIALIZED; 317 318 @UnsupportedAppUsage 319 private final CloseGuard mCloseGuard = CloseGuard.get(); 320 private int mLastTrackIndex = -1; 321 322 @UnsupportedAppUsage 323 private long mNativeObject; 324 325 /** 326 * Constructor. 327 * Creates a media muxer that writes to the specified path. 328 * @param path The path of the output media file. 329 * @param format The format of the output media file. 330 * @see android.media.MediaMuxer.OutputFormat 331 * @throws IllegalArgumentException if path is invalid or format is not supported. 332 * @throws IOException if failed to open the file for write. 333 */ MediaMuxer(@onNull String path, @Format int format)334 public MediaMuxer(@NonNull String path, @Format int format) throws IOException { 335 if (path == null) { 336 throw new IllegalArgumentException("path must not be null"); 337 } 338 // Use RandomAccessFile so we can open the file with RW access; 339 // RW access allows the native writer to memory map the output file. 340 RandomAccessFile file = null; 341 try { 342 file = new RandomAccessFile(path, "rws"); 343 file.setLength(0); 344 FileDescriptor fd = file.getFD(); 345 setUpMediaMuxer(fd, format); 346 } finally { 347 if (file != null) { 348 file.close(); 349 } 350 } 351 } 352 353 /** 354 * Constructor. 355 * Creates a media muxer that writes to the specified FileDescriptor. File descriptor 356 * must be seekable and writable. Application should not use the file referenced 357 * by this file descriptor until {@link #stop}. It is the application's responsibility 358 * to close the file descriptor. It is safe to do so as soon as this call returns. 359 * @param fd The FileDescriptor of the output media file. 360 * @param format The format of the output media file. 361 * @see android.media.MediaMuxer.OutputFormat 362 * @throws IllegalArgumentException if fd is invalid or format is not supported. 363 * @throws IOException if failed to open the file for write. 364 */ MediaMuxer(@onNull FileDescriptor fd, @Format int format)365 public MediaMuxer(@NonNull FileDescriptor fd, @Format int format) throws IOException { 366 setUpMediaMuxer(fd, format); 367 } 368 setUpMediaMuxer(@onNull FileDescriptor fd, @Format int format)369 private void setUpMediaMuxer(@NonNull FileDescriptor fd, @Format int format) throws IOException { 370 if (format < OutputFormat.MUXER_OUTPUT_FIRST || format > OutputFormat.MUXER_OUTPUT_LAST) { 371 throw new IllegalArgumentException("format: " + format + " is invalid"); 372 } 373 mNativeObject = nativeSetup(fd, format); 374 mState = MUXER_STATE_INITIALIZED; 375 mCloseGuard.open("release"); 376 } 377 378 /** 379 * Sets the orientation hint for output video playback. 380 * <p>This method should be called before {@link #start}. Calling this 381 * method will not rotate the video frame when muxer is generating the file, 382 * but add a composition matrix containing the rotation angle in the output 383 * video if the output format is 384 * {@link OutputFormat#MUXER_OUTPUT_MPEG_4} so that a video player can 385 * choose the proper orientation for playback. Note that some video players 386 * may choose to ignore the composition matrix in a video during playback. 387 * By default, the rotation degree is 0.</p> 388 * @param degrees the angle to be rotated clockwise in degrees. 389 * The supported angles are 0, 90, 180, and 270 degrees. 390 * @throws IllegalArgumentException if degree is not supported. 391 * @throws IllegalStateException If this method is called after {@link #start}. 392 */ setOrientationHint(int degrees)393 public void setOrientationHint(int degrees) { 394 if (degrees != 0 && degrees != 90 && degrees != 180 && degrees != 270) { 395 throw new IllegalArgumentException("Unsupported angle: " + degrees); 396 } 397 if (mState == MUXER_STATE_INITIALIZED) { 398 nativeSetOrientationHint(mNativeObject, degrees); 399 } else { 400 throw new IllegalStateException("Can't set rotation degrees due" + 401 " to wrong state."); 402 } 403 } 404 405 /** 406 * Set and store the geodata (latitude and longitude) in the output file. 407 * This method should be called before {@link #start}. The geodata is stored 408 * in udta box if the output format is 409 * {@link OutputFormat#MUXER_OUTPUT_MPEG_4}, and is ignored for other output 410 * formats. The geodata is stored according to ISO-6709 standard. 411 * 412 * @param latitude Latitude in degrees. Its value must be in the range [-90, 413 * 90]. 414 * @param longitude Longitude in degrees. Its value must be in the range 415 * [-180, 180]. 416 * @throws IllegalArgumentException If the given latitude or longitude is out 417 * of range. 418 * @throws IllegalStateException If this method is called after {@link #start}. 419 */ setLocation(float latitude, float longitude)420 public void setLocation(float latitude, float longitude) { 421 int latitudex10000 = (int) (latitude * 10000 + 0.5); 422 int longitudex10000 = (int) (longitude * 10000 + 0.5); 423 424 if (latitudex10000 > 900000 || latitudex10000 < -900000) { 425 String msg = "Latitude: " + latitude + " out of range."; 426 throw new IllegalArgumentException(msg); 427 } 428 if (longitudex10000 > 1800000 || longitudex10000 < -1800000) { 429 String msg = "Longitude: " + longitude + " out of range"; 430 throw new IllegalArgumentException(msg); 431 } 432 433 if (mState == MUXER_STATE_INITIALIZED && mNativeObject != 0) { 434 nativeSetLocation(mNativeObject, latitudex10000, longitudex10000); 435 } else { 436 throw new IllegalStateException("Can't set location due to wrong state."); 437 } 438 } 439 440 /** 441 * Starts the muxer. 442 * <p>Make sure this is called after {@link #addTrack} and before 443 * {@link #writeSampleData}.</p> 444 * @throws IllegalStateException If this method is called after {@link #start} 445 * or Muxer is released 446 */ start()447 public void start() { 448 if (mNativeObject == 0) { 449 throw new IllegalStateException("Muxer has been released!"); 450 } 451 if (mState == MUXER_STATE_INITIALIZED) { 452 nativeStart(mNativeObject); 453 mState = MUXER_STATE_STARTED; 454 } else { 455 throw new IllegalStateException("Can't start due to wrong state."); 456 } 457 } 458 459 /** 460 * Stops the muxer. 461 * <p>Once the muxer stops, it can not be restarted.</p> 462 * @throws IllegalStateException if muxer is in the wrong state. 463 */ stop()464 public void stop() { 465 if (mState == MUXER_STATE_STARTED) { 466 nativeStop(mNativeObject); 467 mState = MUXER_STATE_STOPPED; 468 } else { 469 throw new IllegalStateException("Can't stop due to wrong state."); 470 } 471 } 472 473 @Override finalize()474 protected void finalize() throws Throwable { 475 try { 476 if (mCloseGuard != null) { 477 mCloseGuard.warnIfOpen(); 478 } 479 if (mNativeObject != 0) { 480 nativeRelease(mNativeObject); 481 mNativeObject = 0; 482 } 483 } finally { 484 super.finalize(); 485 } 486 } 487 488 /** 489 * Adds a track with the specified format. 490 * <p> 491 * The following table summarizes support for specific format keys across android releases. 492 * Keys marked with '+:' are required. 493 * 494 * <table style="width: 0%"> 495 * <thead> 496 * <tr> 497 * <th rowspan=2>OS Version(s)</th> 498 * <td colspan=3>{@code MediaFormat} keys used for</th> 499 * </tr><tr> 500 * <th>All Tracks</th> 501 * <th>Audio Tracks</th> 502 * <th>Video Tracks</th> 503 * </tr> 504 * </thead> 505 * <tbody> 506 * <tr> 507 * <td>{@link android.os.Build.VERSION_CODES#JELLY_BEAN_MR2}</td> 508 * <td rowspan=7>+: {@link MediaFormat#KEY_MIME}</td> 509 * <td rowspan=3>+: {@link MediaFormat#KEY_SAMPLE_RATE},<br> 510 * +: {@link MediaFormat#KEY_CHANNEL_COUNT},<br> 511 * +: <strong>codec-specific data<sup>AAC</sup></strong></td> 512 * <td rowspan=5>+: {@link MediaFormat#KEY_WIDTH},<br> 513 * +: {@link MediaFormat#KEY_HEIGHT},<br> 514 * no {@code KEY_ROTATION}, 515 * use {@link #setOrientationHint setOrientationHint()}<sup>.mp4</sup>,<br> 516 * +: <strong>codec-specific data<sup>AVC, MPEG4</sup></strong></td> 517 * </tr><tr> 518 * <td>{@link android.os.Build.VERSION_CODES#KITKAT}</td> 519 * </tr><tr> 520 * <td>{@link android.os.Build.VERSION_CODES#KITKAT_WATCH}</td> 521 * </tr><tr> 522 * <td>{@link android.os.Build.VERSION_CODES#LOLLIPOP}</td> 523 * <td rowspan=4>as above, plus<br> 524 * +: <strong>codec-specific data<sup>Vorbis & .webm</sup></strong></td> 525 * </tr><tr> 526 * <td>{@link android.os.Build.VERSION_CODES#LOLLIPOP_MR1}</td> 527 * </tr><tr> 528 * <td>{@link android.os.Build.VERSION_CODES#M}</td> 529 * <td>as above, plus<br> 530 * {@link MediaFormat#KEY_BIT_RATE}<sup>AAC</sup></td> 531 * </tr><tr> 532 * <td>{@link android.os.Build.VERSION_CODES#N}</td> 533 * <td>as above, plus<br> 534 * <!-- {link MediaFormat#KEY_MAX_BIT_RATE}<sup>AAC, MPEG4</sup>,<br> --> 535 * {@link MediaFormat#KEY_BIT_RATE}<sup>MPEG4</sup>,<br> 536 * {@link MediaFormat#KEY_HDR_STATIC_INFO}<sup>#, .webm</sup>,<br> 537 * {@link MediaFormat#KEY_COLOR_STANDARD}<sup>#</sup>,<br> 538 * {@link MediaFormat#KEY_COLOR_TRANSFER}<sup>#</sup>,<br> 539 * {@link MediaFormat#KEY_COLOR_RANGE}<sup>#</sup>,<br> 540 * +: <strong>codec-specific data<sup>HEVC</sup></strong>,<br> 541 * codec-specific data<sup>VP9</sup></td> 542 * </tr> 543 * <tr> 544 * <td colspan=4> 545 * <p class=note><strong>Notes:</strong><br> 546 * #: storing into container metadata.<br> 547 * .mp4, .webm…: for listed containers<br> 548 * MPEG4, AAC…: for listed codecs 549 * </td> 550 * </tr><tr> 551 * <td colspan=4> 552 * <p class=note>Note that the codec-specific data for the track must be specified using 553 * this method. Furthermore, codec-specific data must not be passed/specified via the 554 * {@link #writeSampleData writeSampleData()} call. 555 * </td> 556 * </tr> 557 * </tbody> 558 * </table> 559 * 560 * <p> 561 * The following table summarizes codec support for containers across android releases: 562 * 563 * <table style="width: 0%"> 564 * <thead> 565 * <tr> 566 * <th rowspan=2>OS Version(s)</th> 567 * <td colspan=3>Codec support</th> 568 * </tr><tr> 569 * <th>{@linkplain OutputFormat#MUXER_OUTPUT_MPEG_4 MP4}</th> 570 * <th>{@linkplain OutputFormat#MUXER_OUTPUT_WEBM WEBM}</th> 571 * </tr> 572 * </thead> 573 * <tbody> 574 * <tr> 575 * <td>{@link android.os.Build.VERSION_CODES#JELLY_BEAN_MR2}</td> 576 * <td rowspan=6>{@link MediaFormat#MIMETYPE_AUDIO_AAC AAC},<br> 577 * {@link MediaFormat#MIMETYPE_AUDIO_AMR_NB NB-AMR},<br> 578 * {@link MediaFormat#MIMETYPE_AUDIO_AMR_WB WB-AMR},<br> 579 * {@link MediaFormat#MIMETYPE_VIDEO_H263 H.263},<br> 580 * {@link MediaFormat#MIMETYPE_VIDEO_MPEG4 MPEG-4},<br> 581 * {@link MediaFormat#MIMETYPE_VIDEO_AVC AVC} (H.264)</td> 582 * <td rowspan=3>Not supported</td> 583 * </tr><tr> 584 * <td>{@link android.os.Build.VERSION_CODES#KITKAT}</td> 585 * </tr><tr> 586 * <td>{@link android.os.Build.VERSION_CODES#KITKAT_WATCH}</td> 587 * </tr><tr> 588 * <td>{@link android.os.Build.VERSION_CODES#LOLLIPOP}</td> 589 * <td rowspan=3>{@link MediaFormat#MIMETYPE_AUDIO_VORBIS Vorbis},<br> 590 * {@link MediaFormat#MIMETYPE_VIDEO_VP8 VP8}</td> 591 * </tr><tr> 592 * <td>{@link android.os.Build.VERSION_CODES#LOLLIPOP_MR1}</td> 593 * </tr><tr> 594 * <td>{@link android.os.Build.VERSION_CODES#M}</td> 595 * </tr><tr> 596 * <td>{@link android.os.Build.VERSION_CODES#N}</td> 597 * <td>as above, plus<br> 598 * {@link MediaFormat#MIMETYPE_VIDEO_HEVC HEVC} (H.265)</td> 599 * <td>as above, plus<br> 600 * {@link MediaFormat#MIMETYPE_VIDEO_VP9 VP9}</td> 601 * </tr> 602 * </tbody> 603 * </table> 604 * 605 * @param format The media format for the track. This must not be an empty 606 * MediaFormat. 607 * @return The track index for this newly added track, and it should be used 608 * in the {@link #writeSampleData}. 609 * @throws IllegalArgumentException if format is invalid. 610 * @throws IllegalStateException if muxer is in the wrong state. 611 */ addTrack(@onNull MediaFormat format)612 public int addTrack(@NonNull MediaFormat format) { 613 if (format == null) { 614 throw new IllegalArgumentException("format must not be null."); 615 } 616 if (mState != MUXER_STATE_INITIALIZED) { 617 throw new IllegalStateException("Muxer is not initialized."); 618 } 619 if (mNativeObject == 0) { 620 throw new IllegalStateException("Muxer has been released!"); 621 } 622 int trackIndex = -1; 623 // Convert the MediaFormat into key-value pairs and send to the native. 624 Map<String, Object> formatMap = format.getMap(); 625 626 String[] keys = null; 627 Object[] values = null; 628 int mapSize = formatMap.size(); 629 if (mapSize > 0) { 630 keys = new String[mapSize]; 631 values = new Object[mapSize]; 632 int i = 0; 633 for (Map.Entry<String, Object> entry : formatMap.entrySet()) { 634 keys[i] = entry.getKey(); 635 values[i] = entry.getValue(); 636 ++i; 637 } 638 trackIndex = nativeAddTrack(mNativeObject, keys, values); 639 } else { 640 throw new IllegalArgumentException("format must not be empty."); 641 } 642 643 // Track index number is expected to incremented as addTrack succeed. 644 // However, if format is invalid, it will get a negative trackIndex. 645 if (mLastTrackIndex >= trackIndex) { 646 throw new IllegalArgumentException("Invalid format."); 647 } 648 mLastTrackIndex = trackIndex; 649 return trackIndex; 650 } 651 652 /** 653 * Writes an encoded sample into the muxer. 654 * <p>The application needs to make sure that the samples are written into 655 * the right tracks. Also, it needs to make sure the samples for each track 656 * are written in chronological order (e.g. in the order they are provided 657 * by the encoder.)</p> 658 * @param byteBuf The encoded sample. 659 * @param trackIndex The track index for this sample. 660 * @param bufferInfo The buffer information related to this sample. 661 * @throws IllegalArgumentException if trackIndex, byteBuf or bufferInfo is invalid. 662 * @throws IllegalStateException if muxer is in wrong state. 663 * MediaMuxer uses the flags provided in {@link MediaCodec.BufferInfo}, 664 * to signal sync frames. 665 */ writeSampleData(int trackIndex, @NonNull ByteBuffer byteBuf, @NonNull BufferInfo bufferInfo)666 public void writeSampleData(int trackIndex, @NonNull ByteBuffer byteBuf, 667 @NonNull BufferInfo bufferInfo) { 668 if (trackIndex < 0 || trackIndex > mLastTrackIndex) { 669 throw new IllegalArgumentException("trackIndex is invalid"); 670 } 671 672 if (byteBuf == null) { 673 throw new IllegalArgumentException("byteBuffer must not be null"); 674 } 675 676 if (bufferInfo == null) { 677 throw new IllegalArgumentException("bufferInfo must not be null"); 678 } 679 if (bufferInfo.size < 0 || bufferInfo.offset < 0 680 || (bufferInfo.offset + bufferInfo.size) > byteBuf.capacity() 681 || bufferInfo.presentationTimeUs < 0) { 682 throw new IllegalArgumentException("bufferInfo must specify a" + 683 " valid buffer offset, size and presentation time"); 684 } 685 686 if (mNativeObject == 0) { 687 throw new IllegalStateException("Muxer has been released!"); 688 } 689 690 if (mState != MUXER_STATE_STARTED) { 691 throw new IllegalStateException("Can't write, muxer is not started"); 692 } 693 694 nativeWriteSampleData(mNativeObject, trackIndex, byteBuf, 695 bufferInfo.offset, bufferInfo.size, 696 bufferInfo.presentationTimeUs, bufferInfo.flags); 697 } 698 699 /** 700 * Make sure you call this when you're done to free up any resources 701 * instead of relying on the garbage collector to do this for you at 702 * some point in the future. 703 */ release()704 public void release() { 705 if (mState == MUXER_STATE_STARTED) { 706 stop(); 707 } 708 if (mNativeObject != 0) { 709 nativeRelease(mNativeObject); 710 mNativeObject = 0; 711 mCloseGuard.close(); 712 } 713 mState = MUXER_STATE_UNINITIALIZED; 714 } 715 } 716