camerabin

CameraBin is a high-level camera object that encapsulates gstreamer elements, providing an API for controlling a digital camera.

Note that camerabin is still UNSTABLE and under development.

CameraBin has the following main features:

  • Record videos
  • Capture pictures
  • Display a viewfinder
  • Post preview images for each capture (video and image)

Usage

Camerabin can be created using gst_element_factory_make just like any other element. Video or image capture mode can be selected using the property and the file to save the capture is selected using property.

After creating camerabin, applications might want to do some customization (there's a section about this below), then select the desired mode and start capturing.

In image capture mode, just send a and a picture will be captured. When the picture is stored on the selected location, a GST_MESSAGE_ELEMENT named 'image-done' will be posted on the GstBus.

In video capture mode, send a to start recording, then send a to stop recording. Note that both signals are asynchronous, so, calling doesn't guarantee that the video has been properly finished yet. Applications should wait for the 'video-done' message to be posted on the bus.

In both modes, if is TRUE, a GstBuffer will be post to the GstBus in a field named 'buffer', in a 'preview-image' message of type GST_MESSAGE_ELEMENT.

Customization

Camerabin provides various customization properties, allowing the user to set custom filters, selecting the viewfinder sink and formats to use to encode the captured images/videos.

GstEncodingProfiles are used to tell camerabin which formats it should encode the captures to, those should be set to and . Default is jpeg for images, and ogg (theora and vorbis) for video. If a profile without an audio stream is set for video, audio will be disabled on recordings.

can be used to select which format preview images should be posted on the GstBus. It has to be a raw video format.

Camerabin has a property so applications can set their source that will provide buffers for the viewfinder and for captures. This camera source is a special type of source that has 3 pads. To use a 'regular' source with a single pad you should use , it will adapt your source and provide 3 pads.

Applications can also select the desired viewfinder sink using , it is also possible to select the audio source using .

The viewfinder resolution can be configured using , these GstCaps should be a subset of .

To select the desired resolution for captures, camerabin provides and , these caps must be a subset of what the source can produce. The allowed caps can be probed using and . In an analogous way, there are and .

Camerabin also allows applications to insert custom GstElement on any of its branches: video capture, image capture, viewfinder and preview. Check , , and .

Example launch line

Unfortunately, camerabin can't be really used from gst-launch-1.0, as you need to send signals to control it. The following pipeline might be able to show the viewfinder using all the default elements.

 gst-launch-1.0 -v -m camerabin

Hierarchy

GObject
    ╰──GInitiallyUnowned
        ╰──GstObject
            ╰──GstElement
                ╰──GstBin
                    ╰──GstPipeline
                        ╰──camerabin

Implemented interfaces

Factory details

Authors: – Thiago Santos

Classification:Generic/Bin/Camera

Rank – none

Plugin – camerabin

Package – GStreamer Bad Plug-ins

Action Signals

start-capture

g_signal_emit_by_name (param_0, "start-capture");
ret = param_0.emit ("start-capture")
let ret = param_0.emit ("start-capture");

Parameters:

param_0 (GstElement *)
No description available

Flags: Run Last / Action


stop-capture

g_signal_emit_by_name (param_0, "stop-capture");
ret = param_0.emit ("stop-capture")
let ret = param_0.emit ("stop-capture");

Parameters:

param_0 (GstElement *)
No description available

Flags: Run Last / Action


Properties

audio-capture-caps

“audio-capture-caps” GstCaps *

Format to capture audio for video recording represented as GstCaps

Flags : Read / Write

Default value :

ANY

audio-capture-supported-caps

“audio-capture-supported-caps” GstCaps *

Formats supported for capturing audio represented as GstCaps

Flags : Read


audio-filter

“audio-filter” GstElement *

The element that will process captured audio buffers when recording. (Should be set on NULL state)

Flags : Read / Write


audio-source

“audio-source” GstElement *

The audio source element to be used on video recordings. It is only taken into use on the next null to ready transition

Flags : Read / Write


camera-source

“camera-source” GstElement *

The camera source element to be used. It is only taken into use on the next null to ready transition

Flags : Read / Write


flags

“flags” Cam-flags *

Control the behaviour of encodebin.

Flags : Read / Write

Default value : (none)


idle

“idle” gboolean

If camerabin2 is idle (not doing captures).

Flags : Read

Default value : true


image-capture-caps

“image-capture-caps” GstCaps *

Caps for image capture

Flags : Read / Write

Default value :

ANY

image-capture-supported-caps

“image-capture-supported-caps” GstCaps *

Formats supported for capturing images represented as GstCaps

Flags : Read


image-filter

“image-filter” GstElement *

The element that will process captured image frames. (Should be set on NULL state)

Flags : Read / Write


image-profile

“image-profile” GstEncodingProfile *

The GstEncodingProfile to use for image captures.

Flags : Read / Write


location

“location” gchararray

Location to save the captured files. A %%d might be used on thefilename as a placeholder for a numeric index of the capture.Default is cap_%%d

Flags : Read / Write

Default value : cap_%%d


max-zoom

“max-zoom” gfloat

Digital zoom factor (e.g. 1.5 means 1.5x)

Flags : Read

Default value : 10


mode

“mode” GstCameraBin2Mode *

The capture mode (still image capture or video recording)

Flags : Read / Write

Default value : mode-image (1)


mute

“mute” gboolean

If the audio recording should be muted. Note that this still saves audio data to the resulting file, but they are silent. Use a video-profile without audio to disable audio completely

Flags : Read / Write

Default value : false


post-previews

“post-previews” gboolean

If capture preview images should be posted to the bus

Flags : Read / Write

Default value : false


preview-caps

“preview-caps” GstCaps *

The caps of the preview image to be posted

Flags : Read / Write


preview-filter

“preview-filter” GstElement *

The element that will process preview buffers. (Should be set on NULL state)

Flags : Read / Write


video-capture-caps

“video-capture-caps” GstCaps *

Caps for video capture

Flags : Read / Write

Default value :

ANY

video-capture-supported-caps

“video-capture-supported-caps” GstCaps *

Formats supported for capturing videos represented as GstCaps

Flags : Read


video-filter

“video-filter” GstElement *

The element that will process captured video frames. (Should be set on NULL state)

Flags : Read / Write


video-profile

“video-profile” GstEncodingProfile *

The GstEncodingProfile to use for video recording. Audio is enabled when this profile supports audio.

Flags : Read / Write


viewfinder-caps

“viewfinder-caps” GstCaps *

Restricts the caps that can be used on the viewfinder

Flags : Read / Write

Default value :

ANY

viewfinder-filter

“viewfinder-filter” GstElement *

The element that will process frames going to the viewfinder. (Should be set on NULL state)

Flags : Read / Write


viewfinder-sink

“viewfinder-sink” GstElement *

The video sink of the viewfinder. It is only taken into use on the next null to ready transition

Flags : Read / Write


viewfinder-supported-caps

“viewfinder-supported-caps” GstCaps *

The caps that the camera source can produce on the viewfinder pad

Flags : Read


zoom

“zoom” gfloat

Digital zoom factor (e.g. 1.5 means 1.5x)

Flags : Read / Write

Default value : 1


Named constants

Cam-flags

Members

no-audio-conversion (0x00000001) – Do not use audio conversion elements
no-video-conversion (0x00000002) – Do not use video conversion elements
no-viewfinder-conversion (0x00000004) – Do not use viewfinder conversion elements
no-image-conversion (0x00000008) – Do not use image conversion elements

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