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gs: add source and sink for Google Cloud Storage

Julien Isorce requested to merge cap/gst-plugins-bad:google_storage_gssrc_gssink into master

Useful when having a service that runs a GStreamer pipeline or application in Google Cloud to avoid storing the inputs and outputs in the running container or service. For example when analyzing a video from a Google Cloud Storage bucket and extracting images or converting the video and then uploading the results into another Google Cloud Storage bucket.

  • gssrc allows to read from a file located in Google Cloud Storage and it supports seeking.
  • gssink allows to write to a file located in Google Cloud Storage. There are 2 modes, one similar to multifilesink and the other similar to filesink.

Example: gst-launch-1.0 gssrc location=gs://mybucket/videos/sample.mp4 ! decodebin ! glimagesink

gst-launch-1.0 playbin uri=gs://mybucket/videos/sample.mp4

gst-launch-1.0 videotestsrc num-buffers=5 ! pngenc ! gssink object-name="img/img%05d.png" bucket-name="mybucket" next-file=buffer

gst-launch-1.0 filesrc location=sample.mp4 ! gssink object-name="videos/video.mp4" bucket-name="mybucket" next-file=none

When running locally simply set GOOGLE_APPLICATION_CREDENTIALS. But when running in Google Cloud Run or Google Cloud Engine, just set the "service-account-email" property on each element.

Closes #1264 (closed)

Edited by Julien Isorce

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