I did: theinstance = bpm_createInstance(2, 44100) and used the same parameters for bpm_putSamples() that used (sucessfully) for soundtouch_putSamples() (to do a stretching).
But I get always bpm_getBpm() = 0.
Is a minimum of samples needed ? I did try with 65536 * channels but still ---> bpm_getBpm(theinstance) = 0.
Or maybe I am missing something ?
Thanks.
Fre;D
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yes, sufficient amount of data is the key. 65536 samples correspond to bit less than 1½ seconds of musi and it's difficult to estimate beat for such short a song clip. 1M samples means already about 24 seconds of music, making it easier for beat detection.
please notice that you don't need to feed all data in a single large buffer, you can also call the bpm->putSamples several times in sequence with time feeding a smaller block of samples to the bpm algorithm.
I'll grab your pascal edits.
Last edit: oparviai 2017-11-26
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Lot of years ago I was super-impressed by the Bass audio library because of his BassFX plugin.
That BassFX could make stretching (= changing the tempo of a song, keeping the original tuning).
The dream of every musician (in my vinyl time, you may change the tempo but the tuning changed too --> must detune the guitar --> the hell ).
Later I noted that all the code that BassFX used for stretching was your SoundTouch code.
I am really happy that you still maintain that brillant project.
In the drums-set, each beat has 4 ticks --> 1 tick = 600/4 = 150 ms
So 150 ms will be the interval of the timer that will run 4 times in one beat.
Now time to play the song and synchronize the drums-set when a pick-beat is found.
For this I need to know how to recognize a pick-beat when a buffer is given to the sound device.
Maybe SoundTouch could help for this.
How do you do to recognize a pick-beat?
When a song is playing, each loop of decoding gives a buffer of to the sound card.
What minimum size should have that buffer to contain a pick?
With a resolution of 44100 samples/seconds, with 100 BPM, each beat needs 600 mseconds, so 26460 samples.
(If I am wrong, please correct me)
It is big to have a good latency.
Maybe all the size of beat is not needeed to find a pick.
How litle the buffer how better would be the result.
The dream would be a kind of bpm_hasBeatPick() with result = position of first pick in the buffer (-1 if none).
It would be used like this:
bpm_putSamples() + bpm_hasBeatPick().
But of course, all idea are welcome.
Thanks.
Fre;D
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please notice that you don't need to feed all data in a single large buffer, you can also call the bpm->putSamples several times in sequence with time feeding a smaller block of samples to the bpm algorithm.
OK but there is something I am not sure.
Does bpm_getBpm() freed the previous data added by bpm-putSamples ?
This because I do not see a bpm_clear.
Or must the instance be deleted by bpm_destroyInstance' before to do a new BPM search (and so recreate a new bpm_createInstance())?
I hope you did understand something...
Fre;D
Last edit: fred vs 2017-12-03
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Hello.
Could it be possible to add/export GetBPM(() method in library SoundTouchDLL ?
Thanks.
Fre;D
Added.
PERFECT. ;-)
Many thanks.
Fre;D
Hello Olli.
OK, compiled SoundTouchDLL.so with exported methods:
bpm_createInstance, bpm_destroyInstance, bpm_getBpm, bpm_putSamples, bpm_putSamples_i16.
I did: theinstance = bpm_createInstance(2, 44100) and used the same parameters for bpm_putSamples() that used (sucessfully) for soundtouch_putSamples() (to do a stretching).
But I get always bpm_getBpm() = 0.
Is a minimum of samples needed ? I did try with 65536 * channels but still ---> bpm_getBpm(theinstance) = 0.
Or maybe I am missing something ?
Thanks.
Fre;D
Re-hello Olli.
Ok, I get it.
On all the songs that I tested, with a buffer of minimum 1 mega (1048576) x channels of samples I get excellent result.
Many thanks.
Fre;D
PS: The Pascal header of SoundTouchDLL library for Unix and Windows OS was updated with last bpm methods.
https://github.com/fredvs/uos/blob/master/src/uos_soundtouch.pas
Last edit: fred vs 2017-11-27
Hello Fred,
yes, sufficient amount of data is the key. 65536 samples correspond to bit less than 1½ seconds of musi and it's difficult to estimate beat for such short a song clip. 1M samples means already about 24 seconds of music, making it easier for beat detection.
please notice that you don't need to feed all data in a single large buffer, you can also call the bpm->putSamples several times in sequence with time feeding a smaller block of samples to the bpm algorithm.
I'll grab your pascal edits.
Last edit: oparviai 2017-11-26
Hello Olli.
Your SoundTouch library is one of my favorite.
Lot of years ago I was super-impressed by the Bass audio library because of his BassFX plugin.
That BassFX could make stretching (= changing the tempo of a song, keeping the original tuning).
The dream of every musician (in my vinyl time, you may change the tempo but the tuning changed too --> must detune the guitar --> the hell ).
Later I noted that all the code that BassFX used for stretching was your SoundTouch code.
I am really happy that you still maintain that brillant project.
I am fan of SoundTouchDLL stretching features and use it in many open-source projects, included:
https://github.com/fredvs/uos
https://github.com/fredvs/strumpract/releases
This days I did play with last SoundTouchDLL and bpm_getBpm() on Linux 64 bit.
Playing a virtual drums-set together with a mp3 song, with same bpm detected by bpm_getBpm() is impressive.
Now the challenge is to synchronize the pick of beat detected by SoundTouch with the timer of the drums-set.
I am exploring some ways.
Here one of them:
Before to play the song, bpm_getBpm() find his BPM (let say 100 BPM).
100 BPM = 100 Beats each 60000 mseconds.
1 BPM = 60000/100 = 600 mseconds.
In the drums-set, each beat has 4 ticks --> 1 tick = 600/4 = 150 ms
So 150 ms will be the interval of the timer that will run 4 times in one beat.
Now time to play the song and synchronize the drums-set when a pick-beat is found.
For this I need to know how to recognize a pick-beat when a buffer is given to the sound device.
Maybe SoundTouch could help for this.
How do you do to recognize a pick-beat?
When a song is playing, each loop of decoding gives a buffer of to the sound card.
What minimum size should have that buffer to contain a pick?
With a resolution of 44100 samples/seconds, with 100 BPM, each beat needs 600 mseconds, so 26460 samples.
(If I am wrong, please correct me)
It is big to have a good latency.
Maybe all the size of beat is not needeed to find a pick.
How litle the buffer how better would be the result.
The dream would be a kind of bpm_hasBeatPick() with result = position of first pick in the buffer (-1 if none).
It would be used like this:
bpm_putSamples() + bpm_hasBeatPick().
But of course, all idea are welcome.
Thanks.
Fre;D
Hello Olli.
OK but there is something I am not sure.
Does bpm_getBpm() freed the previous data added by bpm-putSamples ?
This because I do not see a bpm_clear.
Or must the instance be deleted by bpm_destroyInstance' before to do a new BPM search (and so recreate a new bpm_createInstance())?
I hope you did understand something...
Fre;D
Last edit: fred vs 2017-12-03