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Merge "Fix paragraph in MediaMuxer's javadoc"

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This commit is contained in:
Santiago Seifert
2021-08-26 12:37:30 +00:00
committed by Android (Google) Code Review
parent 4482283272 57f7d57c91
commit 14e210a80f
1 changed files with 8 additions and 11 deletions
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19
media/java/android/media/MediaMuxer.java
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@@ -69,17 +69,14 @@ import java.util.Map;
<h4>Metadata Track</h4>
<p>
Per-frame metadata is useful in carrying extra information that correlated with video or audio to
facilitate offline processing, e.g. gyro signals from the sensor could help video stabilization when
doing offline processing. Metadata track is only supported in MP4 container. When adding a new
metadata track, track's mime format must start with prefix "application/", e.g. "applicaton/gyro".
Metadata's format/layout will be defined by the application. Writing metadata is nearly the same as
writing video/audio data except that the data will not be from mediacodec. Application just needs
to pass the bytebuffer that contains the metadata and also the associated timestamp to the
{@link #writeSampleData} api. The timestamp must be in the same time base as video and audio. The
generated MP4 file uses TextMetaDataSampleEntry defined in section 12.3.3.2 of the ISOBMFF to signal
the metadata's mime format. When using{@link android.media.MediaExtractor} to extract the file with
metadata track, the mime format of the metadata will be extracted into {@link android.media.MediaFormat}.
Per-frame metadata carries information that correlates with video or audio to facilitate offline
processing. For example, gyro signals from the sensor can help video stabilization when doing
offline processing. Metadata tracks are only supported when multiplexing to the MP4 container
format. When adding a new metadata track, the MIME type format must start with prefix
"application/" (for example, "application/gyro"). The format of the metadata is
application-defined. Metadata timestamps must be in the same time base as video and audio
timestamps. The generated MP4 file uses TextMetaDataSampleEntry (defined in section 12.3.3.2 of
the ISOBMFF specification) to signal the metadata's MIME type.
<pre class=prettyprint>
MediaMuxer muxer = new MediaMuxer("temp.mp4", OutputFormat.MUXER_OUTPUT_MPEG_4);