You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
69 lines
2.5 KiB
69 lines
2.5 KiB
---
|
|
layout: page
|
|
title: "Snapshot Size"
|
|
subtitle: "Sizing the snapshots output"
|
|
description: "Sizing the snapshots output"
|
|
category: docs
|
|
order: 10
|
|
date: 2019-02-24 17:36:39
|
|
disqus: 1
|
|
---
|
|
|
|
Snapshots are captured from the preview stream instead of using a separate capture channel.
|
|
They are extremely fast, small in size, and give you a low-quality output that can be easily
|
|
uploaded or processed.
|
|
|
|
The snapshot size is based on the size of the preview stream, which is described in the [Preview Size](preview-size.html) document.
|
|
Although the preview stream size is customizable, note that this is considered an advanced feature,
|
|
as the best preview stream size selector already does a good job for the vast majority of use cases.
|
|
|
|
When taking snapshots, the preview stream size is then changed to match some constraints.
|
|
|
|
### Matching the preview ratio
|
|
|
|
Snapshots will automatically be cropped to match the preview aspect ratio. This means that if your
|
|
preview is square, you can finally take a square picture or video, regardless of the available sensor sizes.
|
|
|
|
Take a look at the [Preview Size](preview-size.html) document to learn about preview sizing.
|
|
|
|
### Other constraints
|
|
|
|
You can refine the size further by applying `maxWidth` and a `maxHeight` constraints:
|
|
|
|
```java
|
|
cameraView.setSnapshotMaxWidth(500);
|
|
cameraView.setSnapshotMaxHeight(500);
|
|
```
|
|
|
|
These values apply to both picture and video snapshots. If the snapshot dimensions exceed these values
|
|
(both default `Integer.MAX_VALUE`), the snapshot will be scaled down to match the constraints.
|
|
|
|
This is very useful as it decouples the snapshot size logic from the preview. By using small constraints,
|
|
you can have a pleasant, good looking preview stream, while still capturing fast, low-res snapshots
|
|
with no issues.
|
|
|
|
### Video Codec requirements
|
|
|
|
When taking video snapshots, the video codec that the device provides might require extra constraints,
|
|
like
|
|
|
|
- width / height alignment
|
|
- maximum width or height
|
|
|
|
CameraView will try to read these requirements and apply them, which can result in video snapshots
|
|
that are smaller than you would expect, or with a **very slightly** different aspect ratio.
|
|
|
|
### XML Attributes
|
|
|
|
```xml
|
|
<com.otaliastudios.cameraview.CameraView
|
|
app:cameraSnapshotMaxWidth="500"
|
|
app:cameraSnapshotMaxHeight="500"/>
|
|
```
|
|
|
|
### Related APIs
|
|
|
|
|Method|Description|
|
|
|------|-----------|
|
|
|`setSnapshotMaxWidth(int)`|Sets the max width for snapshots. If out of bounds, the output will be scaled down.|
|
|
|`setSnapshotMaxHeight(int)`|Sets the max height for snapshots. If out of bounds, the output will be scaled down.| |