EBC Exercise 21 Running Audio and Video - Revision history

Shinnsm at 03:01, 27 September 2012

2012-09-27T03:01:51Z

2012-09-26T16:25:05Z

2012-07-17T19:31:27Z

2012-05-31T14:14:23Z

‎Edit makefile_profile.mak

2012-05-31T14:13:32Z

‎File Management

2012-05-31T14:12:07Z

‎Run Audio and Video in Separate Processes

2012-05-31T14:11:19Z

‎Build Video Executable

2012-05-31T14:10:49Z

‎Build Audio Executable

2012-05-28T17:22:28Z

Added Header/Footer

2011-12-27T21:34:05Z

‎Edit makefile_profile.mak: Added

@@ Line 90: / Line 90: @@
 * Copy the full contents of lab06c_audio_loop-thru into lab08b_audio_video.
-  beagle$ '''cp –rf ../AudioThru/lab06c_audio_loopthru/* lab08b_audio_video'''
+  beagle$ '''cp –rf ../audioThru/lab06c_audio_loopthru/* lab08b_audio_video'''
 * Copy the full contents of lab07d_video_loopthru into lab08b_audio_video.

@@ Line 17: / Line 17: @@
   beagle$ '''make clean'''
   beagle$ '''make'''
-  beagle$ '''mv app_DEBUG.Beagle ../../VideoThru/lab07d_video_loopthru/'''
+  beagle$ '''mv app_DEBUG.Beagle ../../videoThru/lab07d_video_loopthru/'''
 The last command moved app_DEBUG.Beagle to app_AUDIO in the video directory.
@@ Line 24: / Line 24: @@
 * Change to the lab07d_video_loopthru directory then build the application.
-  beagle$ '''cd ../../VideoThru/lab07d_video_loopthru/'''
+  beagle$ '''cd ../../videoThru/lab07d_video_loopthru/'''
   beagle$ '''make clean'''
   beagle$ '''make'''

@@ Line 204: / Line 204: @@
 * Modify '''makefile_profile.mak''' to use the ALSA sound libraries by adding '''-lasound''' to '''CFLAGS'''.
 * Build and run the application
-  $ make
+  beagle$ '''make'''
-  $ ./videoThru_DEBUG.Beagle
+  beagle$ '''./videoThru_DEBUG.Beagle'''
 You should have simultaneous audio and video playing through the board.
 * Press Ctrl-C to exit the application.

@@ Line 55: / Line 55: @@
 * Change to the VideoThru directory.
-  $ cd ..
+  beagle$ '''cd ..'''
 * List the lab08b_audio_video directory.
 Two previously unused files have been provided for you (make sure they’re #included):
-  $ ls lab08b_audio_video
+  beagle$ '''ls lab08b_audio_video'''
   thread.c  thread.h
 * Examine thread.c in gedit or similar editor.
@@ Line 87: / Line 87: @@
 * Copy the full contents of lab07a_osd_setup into lab08b_audio_video.
-  $ cp –rf lab07a_osd_setup/* lab08b_audio_video
+  beagle$ '''cp –rf lab07a_osd_setup/* lab08b_audio_video'''
 * Copy the full contents of lab06c_audio_loop-thru into lab08b_audio_video.
-  $ cp –rf ../AudioThru/lab06c_audio_loopthru/* lab08b_audio_video
+  beagle$ '''cp –rf ../AudioThru/lab06c_audio_loopthru/* lab08b_audio_video'''
 * Copy the full contents of lab07d_video_loopthru into lab08b_audio_video.
-  $ cp –rf lab07d_video_loopthru/* lab08b_audio_video
+  beagle$ '''cp –rf lab07d_video_loopthru/* lab08b_audio_video'''
 === Edit main.c ===

@@ Line 31: / Line 31: @@
 * Execute the app_AUDIO application using the following command:
-  $ ./app_AUDIO &
+  beagle$ '''./app_AUDIO &'''
 Note, the trailing ampersand (&) in this command indicates that the application is to be run as a separate process. (In this case, our audio app will run in the terminal background, meaning that the terminal will remain open to new commands even while the application is executing.)
 * Execute the videoThru_DEBUG.Beagle application (the video loop-thru application) using the following command:
-  $ ./videoThru_DEBUG.Beagle
+  beagle$ '''./videoThru_DEBUG.Beagle'''
 You should now have both audio loop-thru and video loop-thru running concurrently on the board. They are running as concurrent, but separate, processes. In Part b we will use '''pthreads''' to run the audio and video loop-thru in parallel threads within the same process or application.
 * Halt the video loop-thru (running in the terminal foreground) by pressing Ctrl-C.
 * Use the following command to determine the process jobs number of the audio loop-thru, which is running in the terminal background:
-  $ jobs
+  beagle$ '''jobs'''
 * Halt the audio loop-thru using the kill command.
-  $ kill %1
+  beagle$ '''kill %1'''
 === Part a Question ===

@@ Line 15: / Line 15: @@
 * Build the application using “make debug”.
 This will build the debug version. Note, if you have problems building at this step, try cleaning, then building:
-  $ make clean
+  beagle$ '''make clean'''
-  $ make
+  beagle$ '''make'''
-  $ mv app_DEBUG.Beagle ../../VideoThru/lab07d_video_loopthru/
+  beagle$ '''mv app_DEBUG.Beagle ../../VideoThru/lab07d_video_loopthru/'''
 The last command moved app_DEBUG.Beagle to app_AUDIO in the video directory.

@@ Line 1: / Line 1: @@
 [[Category:ECE497]]
 [[Category:EmbeddedBeagleClass]]
 Welcome to Audio and Video labs Parts '''a''' and '''b'''. In Part a, you will combine the audio loop-thru application with the video loop-thru application by running them from the Linux Bash terminal.
@@ Line 213: / Line 214: @@
 # Run '''htop''' in another window.  Why does videoThru_DEBUG.Beagle show up twice? How much of the CPU does it use?
 # Run '''ps aux | grep vid'''.  What shows up?  Try '''ps aux -L | grep vid'''.  What can you tell about the threads?

← Older revision		Revision as of 21:34, 27 December 2011
Line 198:		Line 198:
	* Ensure all '''initMask''' #defines are completed for video and audio.		* Ensure all '''initMask''' #defines are completed for video and audio.
	* Save and close '''main.c'''.		* Save and close '''main.c'''.
		+
		+	=== Edit makefile_profile.mak ===
		+
		+	* Modify '''makefile_profile.mak''' to use the ALSA sound libraries by adding '''-lasound''' to '''CFLAGS'''.
		+	* Build and run the application
		+	$ make
		+	$ ./videoThru_DEBUG.Beagle
		+	You should have simultaneous audio and video playing through the board.
		+	* Press Ctrl-C to exit the application.
		+
		+	=== Demo your program ===
		+
		+	# Demo you program.
		+	# Run '''htop''' in another window. Why does videoThru_DEBUG.Beagle show up twice? How much of the CPU does it use?
		+	# Run '''ps aux \| grep vid'''. What shows up? Try '''ps aux -L \| grep vid'''. What can you tell about the threads?