Author Topic: nPlayer - TI-Nspire Video Player (Read 57754 times)

z80man · « **Reply #45 on:** February 09, 2011, 11:19:49 pm »

Quote from: nspirator on February 09, 2011, 11:11:17 pm

Thanks a lot
But I am not able to run it on my TI-NSPIRE CAS but there only a black screen and it stays like that... Maybe because of the compression with 7zip?

Make sure you unzipped it with 7zip. Here is the link for the utility http://www.7-zip.org/download.html

and can you post the result once you get it working because it would be nice to see the result.

Compynerd255 · « **Reply #46 on:** February 10, 2011, 10:35:18 am »

Okay, now that is awesome. The fact that the nSpire is being utilized so well is just awesome, even if it is a rickroll. Someone should do the Double Rainbow...

Now, sound would actually be quite easy to do. I'll illustrate how a filmstrip works:
---------------------------------------------------------------------------- ------ ------ ------ ------ ------ ------ ------ ------ ------ ------ ------ |o | | o | | o | | o| | | | | | | | | | | | | | | | | | | | | | | o| | o | | o | |o | | | | | | | | | | | | | | | | | | | | | | | | |o | | | | | | | | | | | | | | | | | | | | | | | ------ ------ ------ ------ ------ ------ ------ ------ ------ ------ ------ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ----------------------------------------------------------------------------
As you can see, the top section contains the picture that is displayed on the screen. Alongside the picture area, there is a little area for sound (the ~ things). While a picture is shown on the screen, the sound adjacent to the picture is played on the theater's speaker system.
A digital video would work much the same way. While a video is shown on the screen, the little sound bite associated with that picture would also play through the speaker system.

apcalc · « **Reply #47 on:** February 10, 2011, 08:26:11 pm »

Er, no, I think I know why you can't run it.

Are you using the ticalc version of Ndless 1.7? If so, that is why, this is only compatible with the development version of Ndless. I will build a new version and correct this when I get a free moment (it won't take too long to do), but I am very busy tonight...

nspirator · « **Reply #48 on:** February 10, 2011, 09:23:35 pm »

Yes I use Ndless 1.7... But thanks for your advance to the nspire developement

thepenguin77 · « **Reply #49 on:** February 10, 2011, 10:37:04 pm »

Quote from: Compynerd255 on February 10, 2011, 10:35:18 am

Okay, now that is awesome. The fact that the nSpire is being utilized so well is just awesome, even if it is a rickroll. Someone should do the Double Rainbow...

Now, sound would actually be quite easy to do. I'll illustrate how a filmstrip works:
---------------------------------------------------------------------------- ------ ------ ------ ------ ------ ------ ------ ------ ------ ------ ------ |o | | o | | o | | o| | | | | | | | | | | | | | | | | | | | | | | o| | o | | o | |o | | | | | | | | | | | | | | | | | | | | | | | | |o | | | | | | | | | | | | | | | | | | | | | | | ------ ------ ------ ------ ------ ------ ------ ------ ------ ------ ------ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ----------------------------------------------------------------------------
As you can see, the top section contains the picture that is displayed on the screen. Alongside the picture area, there is a little area for sound (the ~ things). While a picture is shown on the screen, the sound adjacent to the picture is played on the theater's speaker system.
A digital video would work much the same way. While a video is shown on the screen, the little sound bite associated with that picture would also play through the speaker system.

Getting the information to play the sound is not what is difficult. That's easy, just make every 5th byte sound data or something. The problem is playing it on a calculator. Most computers and ipods have sound cards, so all the program has to do is send the sound data out for processing. Some cheaper devices just have a Digital to Analog Converter, which when sent a value, puts that proportion of voltage on the line. For this you would have to send the sound data out at a regular interval.

However, the Nspire has neither. The Nspire has a choice of 100% or 0% voltage, not 65,536 steps. So to make intermediate values, you put it high then low for varying amounts of time depending on the value. And to make this happen accurately at 22,050 Hz takes nearly all the processor time. To add sound, you essentially have to make a sound player and add video. You can't easily add sound to a video player because it require extreme priority. With so many mp3 players around, unless you have great quality sound, people are going to complain while if you have a bad video, it's just a calulator.

calc84maniac · « **Reply #50 on:** February 10, 2011, 10:55:23 pm »

I think it might be possible to use interrupts to play sound, with minimal effect on the rest of the code. However, that might require some hardcore assembly coding for the interrupt handler

Jonius7 · « **Reply #51 on:** February 11, 2011, 02:01:36 am »

Sounds, does nspire have speakers?

TIfanx1999 · « **Reply #52 on:** February 11, 2011, 08:03:42 am »

No, it would require using the Ti-84+ keypad and the link port with headphones plugged in.

Compynerd255 · « **Reply #53 on:** February 11, 2011, 10:24:09 am »

One thing you could use is dithering. That is, every few milliseconds, keep a running tally of how much sound you "owe" in the true sound wave. Then, if you owe more than the peak, switch the voltage to create the click sound.

Additionally, if you use a Standard-to-Mini USB adapter, you could actually play sound out of the USB port using a USB audio device. Of course, the other thing you could do is extract the sound file when exporting the video, then tell the users to load it onto their MP3 player and play it at the same time they start the video (hey, it's low budget, but it works!)

DJ Omnimaga · « **Reply #54 on:** February 14, 2011, 01:04:59 am »

I don't think anyone even managed to understand Nspire USB yet, though, or not enough to achieve USB sound.

Btw welcome here nspirator.

z80man · « **Reply #55 on:** February 14, 2011, 02:34:32 am »

This is probaly not possible, but on the Prizm there is an output buffer on the serial port that can hold up to 1 kb. So to use that you would send the data to the buffer and then continue with the rest of your code until you need to update the buffer. Now depending on the link protocols you might be able to get certain sounds to come out. Now I'm not an Nspire programmer, but if there are output buffers, sound and video could be attempted.

Jonius7 · « **Reply #56 on:** February 15, 2011, 04:36:34 am »

Would nspire have such functions of its hardware? it might, it's just the os that doesn't use the features of those functions.

Quote

Re: TI-Nspire Video Player
« Reply #49 on: 11 February 2011, 12:37:04 pm »
Getting the information to play the sound is not what is difficult. That's easy, just make every 5th byte sound data or something. The problem is playing it on a calculator. Most computers and ipods have sound cards, so all the program has to do is send the sound data out for processing. Some cheaper devices just have a Digital to Analog Converter, which when sent a value, puts that proportion of voltage on the line. For this you would have to send the sound data out at a regular interval.

However, the Nspire has neither. The Nspire has a choice of 100% or 0% voltage, not 65,536 steps. So to make intermediate values, you put it high then low for varying amounts of time depending on the value. And to make this happen accurately at 22,050 Hz takes nearly all the processor time. To add sound, you essentially have to make a sound player and add video. You can't easily add sound to a video player because it require extreme priority. With so many mp3 players around, unless you have great quality sound, people are going to complain while if you have a bad video, it's just a calulator.

100% or 0% voltage sounds like binary code, which probably wouldn't work for sound well enough. but possibly, if the hardware allows it...

ruler501 · « **Reply #57 on:** February 18, 2011, 06:21:34 pm »

I'm sorry if this sounds stupid but where is the download for the rickroll video for the Ti-Nspire? I want to show it to a few friends at my school.

apcalc · « **Reply #58 on:** February 18, 2011, 06:39:41 pm »

I never released a download of the rickroll video.

I will post one here when I get a chance (hopefully by the end of the weekend), but I am severely busy today, and I have to go to an event for the majority of the day tomorrow...

ruler501 · « **Reply #59 on:** February 18, 2011, 06:45:24 pm »

thank you, I won't be able to get it till Sunday anyways I'm going off on a no electronics trip. so it would be wondeful if it was done by Monday. You are doing a wonderful job here keep it up.