Linux/AM5728: Audio example

jahnavi mallpragada

Part Number: AM5728

Tool/software: Linux

Hi,

Do we have any audio loopback example in processor Linux SDK for am5728 evm like for video capture we have dual camera demo.

can you please help me for the example if any.

Thanks,

Jahnavi

over 6 years ago

0 Biser Gatchev-XID over 6 years ago

TI__Guru**** 393215 points

Please check software-dl.ti.com/.../Examples_and_Demos.html

0 Krunal Bhargav34 over 6 years ago in reply to Biser Gatchev-XID

TI__Mastermind 44585 points

Hello Jahnavi,

In PSDK Linux, we do not have any audio loopback example but you could connect the audio input jack (LINE IN ONLY) to your host pc/cell phone via an aux cable. Then, connect speakers/headphones to the audio output jack and type the following commands:

" arecord -D plughw:0,0 -fS32_LE -c2 -r48000 | aplay -D plughw:0,0 -fS32_LE -c2 -r48000". I am able to play music from my phone and listen on the speakers.

By default, no software changes are required in the drivers and I used PSDK Linux 5.0 to perform my test. The test emphasizes the following path:

The following documents have information about arecord/aplay:

Regards,

Krunal

0 jahnavi mallpragada over 6 years ago in reply to Krunal Bhargav34

Intellectual 580 points

Thanks krunal , information was very clear and helpful but my requirement is as such I have to capture video and mix it with audio and save the corresponding compressed file to SD Card programmatically so, how could I achieve this can you please help me out.

0 jahnavi mallpragada over 6 years ago in reply to jahnavi mallpragada

Intellectual 580 points

2. Sorry I forgot to add I just want to know the flow how does a user can access mcasp3 port for audio in and out in PSDK Linux. we have an example for audio loopback in PSDK RTOS, so in the same way do we have for PSDK Linux.

0 Krunal Bhargav34 over 6 years ago in reply to jahnavi mallpragada

TI__Mastermind 44585 points

Hello Jahnavi,

The following document shows a good example of video/audio decoding. Once the board boots up, run the command "gst-launch-1.0 playbin uri=file:////usr/share/ti/video/TearOfSteel-AV-Short-720x420.mp4 video-sink=kmssink audio-sink=alsasink".(Note: I had to stop weston (/etc/init.d/weston stop))

In my setup, I saw a video playing on the LCD screen and I heard audio on the headphones connected to the audio-out jack.

The Audio_ExampleProject in PSDK RTOS is doing the same thing I discussed in my previous post.

Regards,

Krunal

0 jahnavi mallpragada over 6 years ago in reply to Krunal Bhargav34

Intellectual 580 points

Thanks for the reply I have an other doubt can I run this pipeline once at the boot up in a script

0 Krunal Bhargav34 over 6 years ago in reply to jahnavi mallpragada

TI__Mastermind 44585 points

Hello Jahnavi,

Please refer to the following thread.

Regards,

Krunal

0 jahnavi mallpragada over 6 years ago in reply to Krunal Bhargav34

Intellectual 580 points

Thanks Krunal information has helped me a lot and an other doubt,can we convert GStreamer pipelines to C Code .If so, please help me out how to do that.

0 Margarita Gashova over 6 years ago in reply to jahnavi mallpragada

TI__Guru* 80190 points

Hello jahnavi mallpragada,

jahnavi mallpragada said:
can we convert GStreamer pipelines to C Code .

You could use gstreamer pipeline into .c code but first you need working pipeline.

Here are the gstreamer tutorials.

https://gstreamer.freedesktop.org/documentation/tutorials/basic/hello-world.html

If you need more details about this please open a new thread. Thank you!

BR
Margarita

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Linux/AM5728: Audio example