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