BMP PCM polyglot - Revision history

PhilippeTeuwen: /* Image in sound: add color */

2015-03-04T00:24:14Z

Image in sound: add color

← Older revision		Revision as of 00:24, 4 March 2015
Line 177:		Line 177:
	<br>Seen in baudline (as raw 44100Hz 3 channels 32-bit linear little-endian, channel mapping RGB and color aperture from -32 to -64dB, 2048 square windowing, drift integrator beam width 126 slices)		<br>Seen in baudline (as raw 44100Hz 3 channels 32-bit linear little-endian, channel mapping RGB and color aperture from -32 to -64dB, 2048 square windowing, drift integrator beam width 126 slices)
	<br>[[File:Pfrgbspectrogram.png]]		<br>[[File:Pfrgbspectrogram.png]]
			=Sound in sound=
			See [[WAV and soft-boiled eggs]]

	=Troubleshooting=		=Troubleshooting=

2014-10-06T14:56:53Z

Beginning

← Older revision		Revision as of 14:56, 6 October 2014
Line 40:		Line 40:
	bmp_out='b.bmp'		bmp_out='b.bmp'
	# BMP created with Gimp as 16-bit R5G6B5		# BMP created with Gimp as 16-bit R5G6B5
	f=open(bmp_in).read()		f=open(bmp_in, 'rb').read()
	# WAV created with mpg123 -w a.wav a.mp3 (stereo)		# WAV created with mpg123 -w a.wav a.mp3 (stereo)
	w=wave.open(wav_in, 'rb')		w=wave.open(wav_in, 'rb')
	</source>		</source>

	==Parsing BMP==		==Parsing BMP==
	{{#fileanchor: BMPPCM.py}}		{{#fileanchor: BMPPCM.py}}

2014-08-29T07:51:03Z

Image in sound: add color

← Older revision		Revision as of 07:51, 29 August 2014
Line 174:		Line 174:
	<br>I can now use BMPPCM.py, slightly modified to read manually the sound samples as Python wave doesn't support three channels.		<br>I can now use BMPPCM.py, slightly modified to read manually the sound samples as Python wave doesn't support three channels.
	<br>Result is here: http://wiki.yobi.be/images/d/d6/Pfrgb.bmp		<br>Result is here: http://wiki.yobi.be/images/d/d6/Pfrgb.bmp
	<br>Seen in baudline (as raw 44100Hz 3 channels 32-bit linear little-endian, channel mapping RGB and color aperture from -32 to -64dB, drift integrator beam width 126 slices)		<br>Seen in baudline (as raw 44100Hz 3 channels 32-bit linear little-endian, channel mapping RGB and color aperture from -32 to -64dB, 2048 square windowing, drift integrator beam width 126 slices)
	<br>[[File:Pfrgbspectrogram.png]]		<br>[[File:Pfrgbspectrogram.png]]

2014-08-28T22:22:28Z

Gimp

← Older revision		Revision as of 22:22, 28 August 2014
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	==Gimp==		==Gimp==
	It seems Gimp >= 2.8.8 has a bug when opening our crafted BMP (dark greenish image) while Gimp <= 2.8.6 is ok.		It seems Gimp >= 2.8.8 has a bug when opening our crafted BMP (dark greenish image) while Gimp <= 2.8.6 is ok.
	<br>See my [https://bugzilla.gnome.org/show_bug.cgi?id=735557 bugreport & patch]		<br>See my [https://bugzilla.gnome.org/show_bug.cgi?id=735557 bugreport & patch], now [https://git.gnome.org/browse/gimp/commit/?h=gimp-2-8&id=c7c4475eaf578557e6413713ea911012900905d5 integrated] for next release.

	==Saturated sound?==		==Saturated sound?==
	If the sound is saturated, you probably imported the PCM as 32-bit float or big endian or 16-bit instead of 32-bit signed little endian.		If the sound is saturated, you probably imported the PCM as 32-bit float or big endian or 16-bit instead of 32-bit signed little endian.

2014-08-28T22:21:04Z

Saturated sound?

← Older revision		Revision as of 22:21, 28 August 2014
Line 183:		Line 183:
	==Saturated sound?==		==Saturated sound?==
	If the sound is saturated, you probably imported the PCM as 32-bit float or big endian or 16-bit instead of 32-bit signed little endian.		If the sound is saturated, you probably imported the PCM as 32-bit float or big endian or 16-bit instead of 32-bit signed little endian.
	<br>(unless you're trying to play the ~~Corkami~~ ~~file~~, there is nothing to listen to there)		<br>(unless you're trying to play the files with image in spectrogram, there is nothing to listen to there, only in the very first image)
	<br>Thanks @cbrocas ;-)		<br>Thanks @cbrocas ;-)

	=Misc=		=Misc=
	If you want to know more about the bodypainting picture used, see http://www.feelnumb.com/2012/07/19/the-classic-1997-pink-floyd-back-catalogue-poster/		If you want to know more about the bodypainting picture used, see http://www.feelnumb.com/2012/07/19/the-classic-1997-pink-floyd-back-catalogue-poster/

2014-08-28T21:56:53Z

Image in sound: add color

← Older revision		Revision as of 21:56, 28 August 2014
Line 174:		Line 174:
	<br>I can now use BMPPCM.py, slightly modified to read manually the sound samples as Python wave doesn't support three channels.		<br>I can now use BMPPCM.py, slightly modified to read manually the sound samples as Python wave doesn't support three channels.
	<br>Result is here: http://wiki.yobi.be/images/d/d6/Pfrgb.bmp		<br>Result is here: http://wiki.yobi.be/images/d/d6/Pfrgb.bmp
	<br>Seen in baudline (as raw 44100Hz 3 channels 32-bit linear little-endian, channel mapping RGB and color aperture from -32 to -64dB)		<br>Seen in baudline (as raw 44100Hz 3 channels 32-bit linear little-endian, channel mapping RGB and color aperture from -32 to -64dB, drift integrator beam width 126 slices)
	<br>[[File:Pfrgbspectrogram.png]]		<br>[[File:Pfrgbspectrogram.png]]

2014-08-28T18:51:25Z

Saturated sound?

← Older revision		Revision as of 18:51, 28 August 2014
Line 185:		Line 185:
	<br>(unless you're trying to play the Corkami file, there is nothing to listen to there)		<br>(unless you're trying to play the Corkami file, there is nothing to listen to there)
	<br>Thanks @cbrocas ;-)		<br>Thanks @cbrocas ;-)
			=Misc=
			If you want to know more about the bodypainting picture used, see http://www.feelnumb.com/2012/07/19/the-classic-1997-pink-floyd-back-catalogue-poster/

2014-08-28T17:01:55Z

Image in sound

@@ Line 161: / Line 161: @@
 <br>Size 555x512 is the initial image size 400x369 scaled up such that y is a power of 2 (for FFT)
 <br>Note that sampling rates are not really important as the absolute time and frequency scaling doesn't mean anything here.
 =Troubleshooting=

2014-08-28T13:35:14Z

Image in sound

← Older revision		Revision as of 13:35, 28 August 2014
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	<br>To see the spectrogram:		<br>To see the spectrogram:
	<source lang=bash>		<source lang=bash>
		⚫	sox -t raw -r 44100 -c 1 -e signed -b 32 Corkami.bmp -n spectrogram -m -x 555 -y 512 -z 24 -Z -36
	mv Corkami.bmp Corkami.raw
⚫	sox -r 44100 -c 1 -e signed -b 32 Corkami.~~raw~~ -n spectrogram -m -x 555 -y 512 -z 24 -Z -36
	</source>		</source>
	[[File:CorkamiSpectrogram.png]]		[[File:CorkamiSpectrogram.png]]

2014-08-28T08:48:48Z

Saturated sound?

← Older revision		Revision as of 08:48, 28 August 2014
Line 168:		Line 168:
	<br>See my [https://bugzilla.gnome.org/show_bug.cgi?id=735557 bugreport & patch]		<br>See my [https://bugzilla.gnome.org/show_bug.cgi?id=735557 bugreport & patch]
	==Saturated sound?==		==Saturated sound?==
	If the sound is saturated, you probably imported the PCM as 32-bit float or big endian instead of 32-bit signed little endian.		If the sound is saturated, you probably imported the PCM as 32-bit float or big endian or 16-bit instead of 32-bit signed little endian.
	<br>(unless you're trying to play the Corkami file, there is nothing to listen to there)		<br>(unless you're trying to play the Corkami file, there is nothing to listen to there)
	<br>Thanks @cbrocas ;-)		<br>Thanks @cbrocas ;-)