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113 lines
4.9 KiB
113 lines
4.9 KiB
---
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layout: page
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title: "Capturing Media"
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description: "Understanding pictures, videos and the snapshot concept"
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order: 3
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disqus: 1
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---
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This section introduces some key concepts about media capturing, and about the `Mode` control.
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### Mode control
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The mode control determines what can be captured with the standard APIs (read below). It can be set through XML
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or dynamically changed using `cameraView.setMode()`. The current mode value has a few consequences:
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- Sizing: the capture size is chosen among the available picture or video sizes,
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depending on the flag, according to the given size selector.
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- Capturing: while in picture mode, `takeVideo` will throw an exception.
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- Capturing: while in video mode, `takePicture` will throw an exception.
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- Permission behavior: when requesting a `video` session, the record audio permission will be requested.
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If this is needed, the audio permission should be added to your manifest or the app will crash.
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Please read the [permissions page](runtime-permissions).
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```java
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cameraView.setMode(Mode.PICTURE); // for pictures
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cameraView.setMode(Mode.VIDEO); // for video
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```
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### Capturing media
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The library supports 4 capture APIs, two for pictures and two for videos.
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- Standard APIs: `takePicture()` and `takeVideo()`. These take a high quality picture or video, depending
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on the configuration values that were used. The standard APIs **must** be called in the appropriate `Mode`.
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- Snapshot APIs: `takePictureSnapshot()` and `takeVideoSnapshot()`. These take a super fast, reliable
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snapshot of the camera preview. The snapshot APIs can be called in any `Mode` (you can snap videos in picture mode).
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Beyond being extremely fast, and small in size (though low quality), snapshot APIs have the benefit
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that the result is automatically cropped to match the view bounds. This means that, if `CameraView` is square,
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resulting snapshots are square as well, no matter what the sensor available sizes are.
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|Method|Takes|Quality|Callable in `Mode.PICTURE`|Callable in `Mode.VIDEO`|Auto crop|Output size|
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|------|-----|-------|--------------------------|------------------------|---------|-----------|
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|`takePicture()`|Pictures|Standard|`yes`|`no`|`no`|That of `setPictureSize`|
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|`takeVideo(File)`|Videos|Standard|`no`|`yes`|`no`|That of `setVideoSize`|
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|`takePictureSnapshot()`|Pictures|Snapshot|`yes`|`yes`|`yes`|That of the preview stream, [or less](snapshot-size)|
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|`takeVideoSnapshot(File)`|Videos|Snapshot|`yes`|`yes`|`yes`|That of the preview stream, [or less](snapshot-size)|
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> Please note that the video snaphot features requires:
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> - API 18. If called before, it throws
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> - An OpenGL preview (see [previews](previews)). If not, it throws
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### Capturing pictures while recording
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This is allowed at the following conditions:
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- `takePictureSnapshot()` is used (no HQ pictures)
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- the `GL_SURFACE` preview is used (see [previews](previews))
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### Related XML attributes
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```xml
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<com.otaliastudios.cameraview.CameraView
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app:cameraMode="picture|video"/>
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```
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### Related callbacks
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```java
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camera.addCameraListener(new CameraListener() {
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@Override
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public void onPictureTaken(@NonNull PictureResult result) {
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// A Picture was taken!
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}
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@Override
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public void onVideoTaken(@NonNull VideoResult result) {
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// A Video was taken!
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}
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@Override
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public void onVideoRecordingStart() {
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// Notifies that the actual video recording has started.
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// Can be used to show some UI indicator for video recording or counting time.
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}
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@Override
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public void onVideoRecordingEnd() {
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// Notifies that the actual video recording has ended.
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// Can be used to remove UI indicators added in onVideoRecordingStart.
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}
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})
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```
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### Related APIs
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|Method|Description|
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|------|-----------|
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|`setMode()`|Either `Mode.VIDEO` or `Mode.PICTURE`.|
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|`isTakingVideo()`|Returns true if the camera is currently recording a video.|
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|`isTakingPicture()`|Returns true if the camera is currently capturing a picture.|
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|`takePicture()`|Takes a high quality picture.|
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|`takeVideo(File)`|Takes a high quality video.|
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|`takeVideo(FileDescriptor)`|Takes a high quality video.|
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|`takeVideo(File, long)`|Takes a high quality video, stopping after the given duration.|
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|`takeVideo(FileDescriptor, long)`|Takes a high quality video, stopping after the given duration.|
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|`takePictureSnapshot()`|Takes a picture snapshot.|
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|`takeVideoSnapshot(File)`|Takes a video snapshot.|
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|`takeVideoSnapshot(File, long)`|Takes a video snapshot, stopping after the given duration.|
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|`getPictureSize()`|Returns the output picture size, accounting for any rotation. Null while in `VIDEO` mode.|
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|`getVideoSize()`|Returns the output video size, accounting for any rotation. Null while in `PICTURE` mode.|
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|`getSnapshotSize()`|Returns the size of pictures taken with `takePictureSnapshot()` or videos taken with `takeVideoSnapshot()`. Accounts for rotation and cropping.| |