Raspberry Pi Forums

vadim

The soundcard driver initialises and starts the appropriate master clock on GPCLK0 that drives the ADC. As the sample rate is fixed the settings for GPCLK0 are fixed as well. The code is just a copy-paste from I2S driver with the only change for the appropriate memory addresses for control registers...

vadim

PedroGil91 wrote:Hi I´d like to know if i can use ffmpeg just for encoding audio in AAC
thanks

compile ffmpeg with aac support and use "-c:a aac" in the output part of ffmpeg command. see my example above.

vadim

Where can I get the Schematic an code to this project? Don't feel like re-inventing the wheel! The purpose of the project was to re-invent baby cameras in order to understand how the damn thing can be built. :D Since then there has been significant development in Raspbian and Pi peripherals market....

vadim

/usr/bin/ffmpeg -y \ -analyzeduration 100000 \ -v debug -fflags +nobuffer \ -r 25.126 \ -i /home/pi/live.h264 \ -f alsa -ar 32000 -ac 2 -i hw:1,0 \ -c:v copy \ -strict -2 \ -c:a aac -b:a 64k -ac 1 \ -f mpegts udp://224.0.0.1:5000?ttl=4&pkt_size=1400 This is multicast udp stream. Obviously you w...

vadim

Jamesth, if ffmpeg works for you stick with it. I assume you compile it from the sources. You don't need ffserver, ffmpeg can easily stream or output files that a web server can further deliver to the clients. I think you first need to decide what clients to use and then their capabilities. In my ca...

vadim

Hello , i'm interested in sampling an analog audio signal , and acquire it with i2s bus on raspberry . I saw the c code posted by dariush ( http://www.raspberrypi.org/phpBB3/viewtopic.php?t=8496 ) but that was written before the RPi included the P5 connector. Is there a working example of a communi...

vadim

jotun, building the modules is the easy bit. The problem is that no generic platform devices are defined in bcm2708.c you can take a shortcut and define the platform devices for your card and codec in their drivers but that is a very bad style. alternatively, add generic devices ("sound card&qu...

vadim

Not sure why rpi-mbed is not in the stock kernel, I think it was generic enough.
Unfortunately, the only driver with capture link in the official kernel is "snd-hifiberry-digi" with wm8804 codec. But that is SPDIF.

vadim

BBUK, I think you need to set bitclock (frame length) in the card driver. There's a new function in 3.10.

vadim

rpi-dac is a generic driver that will provide output with many non-configurable NOS DACs in slave mode. i think we also need a generic in/out driver and one for RPi as slave. that should cover about 80% of use cases.

vadim

For uniform addressing of all control registers, perhaps. There will be different shifts for other controls.

vadim

paulie wrote:I have seen a Breitling Hospitality area at RIAT in the past.
If you can afford a Breitling, you can probably afford Airshow tickets:-)

This is Raspberry Pi forum, not D-Wave Two!

vadim

I don't recommend powering from RPi. It's dangerous and too noisy for audio.

vadim

Why do you need to send data to output 25 times per second? I mean it's a known sequence so you can prepare a couple of seconds worth data and write it to the device less regularly. Or am I missing something?

vadim

not really a copy-paste as the name of platform device was changed. you will need to change it in card dai definition in card driver. don't forget to add platform devices for card and codec in bcm2708.c (same as for hifiberry that is already defined there)

vadim

build kernel version 3.10. you might have some issues after upgrading Pi to 3.10 and then running experimental 3.8 kernel.
just use rpi-3.10.y-asoc branch in git

vadim

Anyone who has made USB 2.0 webcam work at FullHD in mjpg mode at 25-30 fps, raise your hand!
No hands? I thought so...

vadim

Morpheus, you should understand that Florian doesn't write drivers for DACs he doesn't have. Simply because they can't be tested. Having said that, most simple connections (not involving i2c or SPI) should work with a driver that already exists. A change of slave-master configuration and the set of ...

vadim

check out RaspCtl

vadim

Buffering makes sense because writing to USB HDD is a slow process. I bet you will see high waiting % in top. Remember, your USB subsystem is stressed twice with the same data, so when receiving it can't write at the same time.

vadim

Interesting, will look at it next week when back home.

vadim

If you have a device that is capable of correctly displaying 24bits I bet it's not a cheap RPi you're going to connect to it. Why bother about 36bits if all you see is 6 per channel?

vadim

I believed in you! :D Sorry, I haven't tested yet and will have to postpone testing to next week. I'm still struggling to see the point of forcing different frame lengths for different sampling rates. I don't think that there are many DAC/ADC that would accommodate that (NOS in slave mode, perhaps),...

vadim

Slow samba?

Oh, they must have called it sarabande.

Invented in hell, as Cervantes once said.
In short, don't use it.

vadim

Eugene, with all respect, these solutions don't offer anything better than SeNS already has. I find ffserver useful only when there is need to provide many different streams, which RPi anyway is not capable of producing. aac encoding on the fly is extremely heavy, I don't get the reason for encoding...

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