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added video streaming and streaming documentation
the elusive VLC plus RPi.GPIO working together for button-controlled streaming
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Alex Eames
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Aug 2, 2013
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,118 @@ | ||
| #!/usr/bin/env python2.7 | ||
| # script by Alex Eames http://RasPi.tv | ||
| import RPi.GPIO as GPIO | ||
| import sys | ||
| import time | ||
| from time import sleep | ||
|
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||
| front_led_status = sys.argv[-1] | ||
| if front_led_status == "0": | ||
| print "front LED off" | ||
| front_led_status = 0 | ||
|
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||
| streaming_on = 0 | ||
| streaming_file = "/home/pi/streaming.txt" | ||
| time_off = 0 | ||
|
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| GPIO.setmode(GPIO.BCM) | ||
|
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| # GPIO 23 set up as input, pulled up to avoid false detection. | ||
| # wired to connect to GND on button press. | ||
| # So we'll be setting up falling edge detection | ||
| GPIO.setup(23, GPIO.IN, pull_up_down=GPIO.PUD_UP) | ||
|
|
||
| # GPIO 24 set up as an input, pulled down, connected to 3V3 on button press | ||
| GPIO.setup(24, GPIO.IN, pull_up_down=GPIO.PUD_DOWN) | ||
|
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||
| # Set up GPIO 5 for camera LED control and rear LED control | ||
| GPIO.setup(5, GPIO.OUT) | ||
| GPIO.setup(22, GPIO.OUT) | ||
|
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||
| def write_streaming_status(streaming_on): | ||
| vrnw = open(streaming_file, 'w') | ||
| vrnw.write(str(streaming_on)) | ||
| vrnw.close() | ||
|
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||
| def check_streaming_status(): | ||
| # read file streaming_file, make into int() set streaming_on equal to it | ||
| vrn = open(streaming_file, 'r') | ||
| streaming_on = int(vrn.readline()) | ||
| #print "streaming_on is %d" % streaming_on | ||
| vrn.close() | ||
| return streaming_on | ||
|
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||
| # threaded callback function runs in another thread when event is detected | ||
| # this increments variable rec_num for filename and starts recording | ||
| def stream_button(channel): | ||
| global time_off | ||
| time_now = time.time() | ||
| if (time_now - time_off) >= 0.3: | ||
| streaming_status = check_streaming_status() | ||
| if streaming_status == 0: | ||
| write_streaming_status(1) | ||
| print "stream button pressed" | ||
| if front_led_status != 0: | ||
| GPIO.output(5, 1) | ||
| GPIO.output(22, 1) | ||
| time_off = time.time() | ||
|
|
||
| def flash(interval,reps): | ||
| for i in range(reps): | ||
| GPIO.output(5, 1) | ||
| GPIO.output(22, 1) | ||
| sleep(interval) | ||
| GPIO.output(5, 0) | ||
| GPIO.output(22, 0) | ||
| sleep(interval) | ||
|
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||
| try: | ||
| write_streaming_status(0) | ||
| except: | ||
| print "couldn't write streaming status" | ||
| sys.exit() | ||
|
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| # when a falling edge is detected on blue stream button port 23 stream_button() will be run | ||
| GPIO.add_event_detect(23, GPIO.FALLING, callback=stream_button) | ||
|
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||
| try: | ||
| while True: | ||
| # this will run until black button attached to 24 is pressed, then | ||
| # if pressed long, shut program, if pressed very long shutdown Pi | ||
| # stop recording and shutdown gracefully | ||
| print "Waiting for button press" # rising edge on port 24" | ||
| GPIO.wait_for_edge(24, GPIO.RISING) | ||
| #print "Stop button pressed" | ||
|
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||
| time_now = time.time() | ||
| if (time_now - time_off) >= 0.3: | ||
| streaming_status = check_streaming_status() | ||
| if streaming_status == 1: | ||
| write_streaming_status(0) | ||
| print "Stop button pressed" | ||
| GPIO.output(5, 0) | ||
| GPIO.output(22, 0) | ||
| time_off = time.time() | ||
|
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||
| # poll GPIO 24 button at 20 Hz continuously for 2 seconds | ||
| # if at the end of that time button is still pressed, shut down | ||
| # if it's released at all, break | ||
| for i in range(60): | ||
| if not GPIO.input(24): | ||
| break | ||
| sleep(0.05) | ||
|
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||
| if 25 <= i < 58: | ||
| print "Closing program" | ||
| flash(0.02,50) # interval,reps | ||
| write_streaming_status(2) # 2 will close the host program | ||
| GPIO.cleanup() | ||
| sys.exit() | ||
|
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||
| if GPIO.input(24): | ||
| if i >= 59: | ||
| shutdown() | ||
|
|
||
| except KeyboardInterrupt: | ||
| stop_recording() | ||
| GPIO.cleanup() # clean up GPIO on CTRL+C exit | ||
| GPIO.cleanup() # clean up GPIO on normal exit |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,77 @@ | ||
| #!/usr/bin/env python2.7 | ||
| # script by Alex Eames http://RasPi.tv | ||
|
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||
| from subprocess import call | ||
| import sys | ||
| import time | ||
|
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||
| front_led_status = sys.argv[-1] | ||
| if front_led_status == "0": | ||
| print "front LED off" | ||
| front_led_status = 0 | ||
|
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| streaming_on = 0 | ||
| streaming_file = "/home/pi/streaming.txt" | ||
| if front_led_status == 0: | ||
| sudo_file = "sudo python /home/pi/picamstream-sudo.py 0 &" | ||
| else: | ||
| sudo_file = "sudo python /home/pi/picamstream-sudo.py &" | ||
|
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| stream = "raspivid -o - -t 9999999 -w 640 -h 360 -fps 25|cvlc stream:///dev/stdin --sout '#standard{access=http,mux=ts,dst=:8090}' :demux=h264 &" | ||
|
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| # you can change -w and -h numbers for whatever suits your network. | ||
| # Depending on what I'm streaming to, mine can cope with 720p, | ||
| # which is -w 1280 -h 720 | ||
|
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| def stream_video(): | ||
| print "starting streaming\n%s" % stream | ||
| call ([stream], shell=True) | ||
|
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| def stop_stream(): | ||
| print "stopping streaming" | ||
| call (["pkill raspivid"], shell=True) | ||
| call (["pkill cvlc"], shell=True) | ||
|
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| def check_streaming_status(): | ||
| # read file streaming_file, make into int() set streaming_on equal to it | ||
| vrn = open(streaming_file, 'r') | ||
| streaming_on = int(vrn.readline()) | ||
| #print "streaming_on is %d" % streaming_on | ||
| vrn.close() | ||
| return streaming_on | ||
|
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| def write_streaming_status(streaming_on): | ||
| vrnw = open(streaming_file, 'w') | ||
| vrnw.write(str(streaming_on)) | ||
| vrnw.close() | ||
|
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||
| try: | ||
| write_streaming_status(0) | ||
| except: | ||
| print "couldn't write streaming status" | ||
| sys.exit() | ||
|
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| call ([sudo_file], shell=True) | ||
|
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| previous_streaming_on = 0 | ||
| counter = 0 | ||
|
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| #have a file containing the streaming_on variable value | ||
| while True: | ||
| streaming_on = check_streaming_status() | ||
| #print "streaming status = %d" % streaming_on | ||
|
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| if streaming_on != previous_streaming_on: | ||
| if streaming_on == 1: | ||
| stream_video() | ||
| elif streaming_on == 0: | ||
| stop_stream() | ||
| else: | ||
| stop_stream() | ||
| print "Closing picamstreamer.py" | ||
| sys.exit() | ||
| if counter % 50 == 0: | ||
| print "streaming status = %d" % streaming_on | ||
| previous_streaming_on = streaming_on | ||
| counter += 1 | ||
| time.sleep(0.1) |