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Added alsa transform gui application
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‎gst-python-samples/Gstreamer-Applications/gst_alsa/README.md‎

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# Gst_ALSA
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The purpose of this application is to implement the playback and recording functions of gstreamer+alsa on the QTI platform.
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## Note:
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- If pulseaudio service is enabled, disable it and start the alsa-restore service.
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```bash
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$ systemctl stop pulseaudio
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$ apt-get install alsa-utils
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$ systemctl start alsa-restore.service
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```
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BTW, if you want to disable this service, please run:
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```
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$ systemctl disable qc-alsa-restore
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```
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### Steps to run alsa playback and recording application
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- Go to the downloaded directory on RB5
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```bash
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cd /gst-python-samples/Gstreamer-Applications/gst-alsa
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```
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- Run the alsa playback and record application
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-**Alsa audio playback:** Provide playback as the first argument for audio playback.
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```bash
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python3 gst-alsa playback audiofile.wav
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```
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-**Alsa audio recording:** Provide capture as the first argument for alsa audio recording.
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```bash
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python3 gst-alsa capture audiorecord.wav

‎gst-python-samples/Gstreamer-Applications/gst_alsa/alsa.py‎

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import sys
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import gi
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import logging
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import os
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gi.require_version("GLib", "2.0")
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gi.require_version("GObject", "2.0")
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gi.require_version("Gst", "1.0")
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from gi.repository import Gst, GLib, GObject
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from numpy import ndarray
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#Playback sample code
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def gst_sample_playback(content):
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# Create the empty pipeline
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pipeline = Gst.Pipeline.new("audio playback")
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filesrc = Gst.ElementFactory.make("filesrc", "file_src")
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wavparse = Gst.ElementFactory.make("wavparse", "wav_parse");
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alsasink = Gst.ElementFactory.make("alsasink", "alsa_sink");
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if not pipeline or not filesrc or not wavparse or not alsasink:
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print("Create pipeline/filesrc/wavparse/alsasink element failed.")
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sys.exit(1)
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#set properties to the elements
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filesrc.set_property('location',content)
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alsasink.set_property('device',"hw:0,0")
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#Build pipeline
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#Add elements to the pipeline and link them
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pipeline.add(filesrc)
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pipeline.add(wavparse)
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pipeline.add(alsasink)
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if not filesrc.link(wavparse):
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print("ERROR: Could not link filesrc to wavparse")
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sys.exit(1)
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if not wavparse.link(alsasink):
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print("ERROR: Could not link wavparse to alsasink")
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sys.exit(1)
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pipeline.set_state(Gst.State.PLAYING)
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print("Start");
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bus = pipeline.get_bus()
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bus_id = bus.add_signal_watch()
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msg = bus.timed_pop_filtered(Gst.CLOCK_TIME_NONE,Gst.MessageType.ERROR | Gst.MessageType.EOS)
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if msg:
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t = msg.type
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if t == Gst.MessageType.ERROR:
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err, dbg = msg.parse_error()
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print("ERROR:", msg.src.get_name(), ":", err.message)
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if dbg:
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print("debugging info:", dbg)
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elif t == Gst.MessageType.EOS:
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print("Stop end-Of-Stream reached")
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else:
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print("ERROR: Unexpected message received.")
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pipeline.set_state(Gst.State.NULL)
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Gst.Object.unref(bus)
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Gst.deinit()
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sys.exit(1)
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#Capture sample code
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def gst_sample_capture(content):
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#create the empty pipeline
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alsasrc = Gst.ElementFactory.make("alsasrc", "alsa_src");
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capsfilter = Gst.ElementFactory.make("capsfilter", "caps_filter");
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wavenc = Gst.ElementFactory.make("wavenc", "wav_enc");
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filesink = Gst.ElementFactory.make("filesink", "file_sink");
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pipeline = Gst.Pipeline.new("audio_capture_stream");
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if not pipeline or not alsasrc or not capsfilter or not wavenc or not filesink:
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print("Create pipeline/alsasrc/capsfilter/wavenc/filesink element failed.")
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sys.exit(1)
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#set properties to the elements
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alsasrc.set_property("device","hw:0,0")
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alsasrc.set_property("num-buffers",1000)
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alsasrc.set_property("buffer-time",10000)
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caps=Gst.Caps.new_empty_simple("audio/x-raw")
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capsfilter.set_property("caps",caps)
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filesink.set_property("location",content)
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#Build the pipeline. Add elements to the pipeline and link them
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pipeline.add(alsasrc)
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pipeline.add(capsfilter)
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pipeline.add(wavenc)
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pipeline.add(filesink)
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if not alsasrc.link(capsfilter):
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print("ERROR: Could not link alsasrc to capsfilter")
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sys.exit(1)
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if not capsfilter.link(wavenc):
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print("ERROR: Could not link capsfilter to wavenc")
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sys.exit(1)
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if not wavenc.link(filesink):
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print("ERROR: Could not link wavenc to filesink")
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sys.exit(1)
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pipeline.set_state(Gst.State.PLAYING)
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print("Start");
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bus = pipeline.get_bus()
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bus_id = bus.add_signal_watch()
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msg = bus.timed_pop_filtered(Gst.CLOCK_TIME_NONE,Gst.MessageType.ERROR | Gst.MessageType.EOS)
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if msg:
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t = msg.type
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if t == Gst.MessageType.ERROR:
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err, dbg = msg.parse_error()
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print("ERROR:", msg.src.get_name(), ":", err.message)
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if dbg:
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print("debugging info:", dbg)
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elif t == Gst.MessageType.EOS:
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print("Stop end-Of-Stream reached")
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else:
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print("ERROR: Unexpected message received.")
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pipeline.set_state(Gst.State.NULL)
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Gst.Object.unref(bus)
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Gst.deinit()
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sys.exit(1)
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def main():
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Gst.init(sys.argv)
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if len(sys.argv) < 2:
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print("Missing <output-location> parameter")
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sys.exit(1)
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else:
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if (sys.argv[1]=="playback"):
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gst_sample_playback(sys.argv[2]);
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elif(sys.argv[1]=="capture"):
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gst_sample_capture(sys.argv[2]);
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else:
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print("Unexpected operation %s", sys.argv[1]);
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if __name__ == "__main__":
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main()

‎gst-python-samples/Gstreamer-Applications/gst_alsa/image/capture.png‎

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‎gst-python-samples/Gstreamer-Applications/gst_alsa/image/playback.png‎

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‎gst-python-samples/Gstreamer-Applications/gst_gui_app/README.md‎

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# Graphical User Interface Application
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This sample shows a gui application which demonstrates camera display, camera recording, and mp4 playback.
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## Prerequisite on RB5
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- Make sure to check python version.PyQt will require python 3.6 or above
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```bash
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python --version
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```
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- Installing python dev tools & PyQt library
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```bash
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apt-get install python3-dev
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apt-get install python-qt5
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```
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- Installing PyQt5 & PyQt5-tools
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```bash
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pip install pyqt5
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pip install pyqt5-tools
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```
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- Setting the Display variables
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```bash
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export QT_QPA_PLATFORM=wayland
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```
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## GUI Application
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### Launch ```gui_app```
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+ Connect the board to screen through HDMI output
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+ Connect keyboard and mouse to the board
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```bash
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python3 gui_app.py
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```
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## Snapshot
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![Iamge text](image/gui-app-snapshot.png)
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## Settings
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### Camera Settings
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Camera settings set camera parameters for display and recording.
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+ Camera ID (0~4)
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+ Resolution: width and height
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+ Framerate
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### Transform Settings
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Transform settings set transform parameters for display only.
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+ Flip: horizontal or vertical
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+ Rotate: 90CW, 90CCW, and 180
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+ Crop: x, y, width, height
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### View Settings
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View settings set view parameters for display and playback.
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+ Fullscreen
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+ Location: x, y
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+ Size: width and height
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## Operations
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There are 3 operations in this application.
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### Display
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+ Click ```Display``` button. Camera view will display on the screen.
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+ Click ```Stop``` to stop display.
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### Record
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+ Click ```Record``` button. A file dialog will popup to specify the mp4 file name to be saved. Then recording will start. The camera view will also display on the screen.
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+ Click ```Stop``` to stop recording.
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### Playback
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+ Click ```Playback``` button. A file dialog will popup to specify the mp4 file name to playback. Then playback will start.
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+ Click ```Stop``` to stop playback.
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