topic Re: [Android] How to support SPDIF input feature? in i.MX Processors

[Android] How to support SPDIF input feature?

charleshuang — Fri, 30 May 2014 09:52:35 GMT

Hi,

We need to enable SPDIF input feature on i.MX6 Android platform.

In the BSP 4.2.2_1.0.0, there are SPDIF related source codes in hardware/imx/alsa/config_spdif.h & hardware/imx/alsa/tinyalsa_hal.c.

I find AUDIO_DEVICE_IN_AUX_DIGITAL device is assigned for SPDIF input, but it seems not work actually when I set attached_input_devices to AUDIO_DEVICE_IN_AUX_DIGITAL in audio_policy.conf.

The logs are as below.

=====

1699:01-02 00:28:39.410 I/OMXPlayer( 2284): Audio source: 1

1700:01-02 00:28:39.410 W/audio_hw_primary( 2284): In channels 1, rate 8000, devices 0x80000020

1701:01-02 00:28:39.410 W/audio_hw_primary( 2284): get_input_buffer_size size = 96, channel_count = 1

1702:01-02 00:28:39.410 W/audio_hw_primary( 2284): get_input_buffer_size size = 96, channel_count = 1

1703:01-02 00:28:39.430 E/AudioPolicyManagerBase( 2284): getDeviceForStrategy() speaker device not found for STRATEGY_SONIFICATION

1704:01-02 00:28:39.430 E/AudioPolicyManagerBase( 2284): getDeviceForStrategy() speaker device not found for STRATEGY_SONIFICATION

1707:01-02 00:28:39.440 I/OMXPlayer( 2284): Set AudioSource start time.

1708:01-02 00:28:39.440 W/audio_hw_primary( 2284): in_set_parameters input_source=1;routing=-2147483616, ret 11

1709:01-02 00:28:39.450 W/audio_hw_primary( 2284): start_input_stream....

1710:01-02 00:28:39.450 W/audio_hw_primary( 2284): card 1, port 0 device 0x20

1711:01-02 00:28:39.450 W/audio_hw_primary( 2284): rate 44100, channel 2 format 2, period_size 0x200

1713:01-02 00:28:41.460 I/OMXPlayer( 2284): OMX.Freescale.std.audio_source.android.sw-based wait command[0:3] timeout.

1718:01-02 00:28:42.040 I/OMXPlayer( 2284): OMX.Freescale.std.audio_source.android.sw-based send command[0:2] timeout.

1722:01-02 00:28:42.580 I/OMXPlayer( 2284): OMX.Freescale.std.audio_source.android.sw-based Time out for Sending Command [2:1], Busy on Command [0:2].

1724:01-02 00:28:42.580 I/OMXPlayer( 2284): OMX.Freescale.std.audio_source.android.sw-based Wait incorrect Command[2:1], ProcessingCmd is [0:2].

1737:01-02 00:28:49.470 W/audio_hw_primary( 2284): ret -1, pcm write 768 error cannot write stream data: I/O error.

1738:01-02 00:28:49.470 E/audio_hw_primary( 2284): get_next_buffer() pcm_read_wrapper error -1

1739:01-02 00:28:49.470 E/audio_hw_primary( 2284): get_next_buffer() pcm_read_convert error -1

1740:01-02 00:28:49.470 W/audio_hw_primary( 2284): ret -1, pcm read error cannot read stream data: I/O error.

1741:01-02 00:28:49.470 W/audio_hw_primary( 2284): ret -1, pcm write 768 error cannot prepare channel: Device or resource busy.

1742:01-02 00:28:49.470 W/audio_hw_primary( 2284): ret -1, pcm write 768 error cannot prepare channel: Device or resource busy.

1743:01-02 00:28:49.480 E/audio_hw_primary( 2284): get_next_buffer() pcm_read_wrapper error -16

1744:01-02 00:28:49.480 E/audio_hw_primary( 2284): get_next_buffer() pcm_read_convert error -16

1745:01-02 00:28:49.480 W/audio_hw_primary( 2284): ret -16, pcm read error cannot prepare channel: Device or resource busy.

1746:01-02 00:28:49.480 W/audio_hw_primary( 2284): ret -1, pcm write 768 error cannot prepare channel: Device or resource busy.

1748:01-02 00:28:49.480 I/OMXPlayer( 2284): OMX.Freescale.std.audio_source.android.sw-based Invalid state transitioin: 3 -> 1.

1752:01-02 00:28:49.490 W/audio_hw_primary( 2284): do_out_standby... 1074310608

1753:01-02 00:28:49.490 E/audio_hw_primary( 2284): get_next_buffer() pcm_read_wrapper error -16

1754:01-02 00:28:49.490 E/audio_hw_primary( 2284): get_next_buffer() pcm_read_convert error -16

1755:01-02 00:28:49.490 W/audio_hw_primary( 2284): ret -16, pcm read error cannot prepare channel: Device or resource busy.

1756:01-02 00:28:49.500 E/audio_hw_primary( 2284): get_next_buffer() pcm_read_wrapper error -16

1757:01-02 00:28:49.500 E/audio_hw_primary( 2284): get_next_buffer() pcm_read_convert error -16

1758:01-02 00:28:49.500 W/audio_hw_primary( 2284): ret -16, pcm read error cannot prepare channel: Device or resource busy.

1759:01-02 00:28:49.520 E/audio_hw_primary( 2284): get_next_buffer() pcm_read_wrapper error -16

1760:01-02 00:28:49.520 E/audio_hw_primary( 2284): get_next_buffer() pcm_read_convert error -16

1761:01-02 00:28:49.520 W/audio_hw_primary( 2284): ret -16, pcm read error cannot prepare channel: Device or resource busy.

1762:01-02 00:28:49.530 E/audio_hw_primary( 2284): get_next_buffer() pcm_read_wrapper error -16

1763:01-02 00:28:49.530 E/audio_hw_primary( 2284): get_next_buffer() pcm_read_convert error -16

1764:01-02 00:28:49.530 W/audio_hw_primary( 2284): ret -16, pcm read error cannot prepare channel: Device or resource busy.

1765:01-02 00:28:49.540 E/audio_hw_primary( 2284): get_next_buffer() pcm_read_wrapper error -16

1766:01-02 00:28:49.540 E/audio_hw_primary( 2284): get_next_buffer() pcm_read_convert error -16

=====

In addition, it also failed when I try to capture SPDIF frame with tinycap.

=====

root@android:/data # tinycap test.wav -D 1 -d 0

Unable to open PCM device (cannot set hw params: Invalid argument)

Captured 0 frames

=====

Thanks,

Daniel

Re: [Android] How to support SPDIF input feature?

weidong_sun — Thu, 05 Jun 2014 01:54:43 GMT

Hi Daniel,

If you want to use SPDIF input feature, you should multiplex SPDIF_IN signal via one of the following CPU PADs on you board(hardware) :

Then add multiplexing codes to BSP file or corresponding header file, multiplexing PADs are defined in ~/myandroid/kernel_imx/arch/arm/plat-mxc/include/mach/iomux_mx6q.h

Please try it on!

Regards,

Weidong

Re: [Android] How to support SPDIF input feature?

brucequinton — Thu, 05 Jun 2014 05:52:26 GMT

Hi Weidong and Daniel,
I came across this post while looking for information on how to use the SPDIF input on a Utilite (which has the CM-MX6 board) I looked through the iomux_mx6q.h file and I believe I have assigned the CPU PAD as mentioned above, I re-compiled the Kernel but I I still get a read/input error when I attempt to open the SPDIF hardware.

To be honest I'm not sure I even need to recompile the kernel but I figured it couldn't hurt. :smileywink: I feel I need to do a lot more reading before I will be able to read the data from my SPDIF input hardware, could either of you give me some direction please?

(I'm not attempting to hijack the thread, so please ignore my post if Daniels question is not answered)

Regards Bruce

Re: [Android] How to support SPDIF input feature?

danielhung — Thu, 05 Jun 2014 07:14:59 GMT

Hi Bruce,

You may need to check if SPDIF device can be seen in kernel first.

Besides the CPU PADs settings, you have to open the defconfig as well.

CONFIG_SND_MXC_SOC_SPDIF_DAI=y

CONFIG_SND_SOC_IMX_SPDIF=y

CONFIG_SND_SOC_MXC_SPDIF=y

Then, you should be able to see the SPDIF device in kernel log like this.

ALSA device list:

#0: sgtl5000-audio

#1: imx-spdif

#2: imx-hdmi-soc

Best regards,

Daniel

Re: [Android] How to support SPDIF input feature?

danielhung — Thu, 05 Jun 2014 07:27:47 GMT

Hi Weidong,

Thanks for reply. I can see the SPDIF device in kernel and SPDIF input/output both works fine in Linux.

The question now is about Android HAL.

The target is to let users can record from SPDIF input device via Sound Recorder application.

Thanks,

Daniel

Re: [Android] How to support SPDIF input feature?

brucequinton — Thu, 05 Jun 2014 07:41:01 GMT

Daniel,Thank you for the reply. I can now see the #1: imx-spdif in the log but when I attempt to use it I get a read/input error.

Maybe I'm attempting to use it wrong. Would you happen to have a snippet of code that connect to the SPDIF device and stream data (even just to the stdout)

Sorry to ask but I cannot see where I have gone wrong..

thanks again I appreciate to the help.

Regards Bruce Quinton

Re: [Android] How to support SPDIF input feature?

danielhung — Thu, 05 Jun 2014 08:08:19 GMT

Hi Bruce,

How do you use it? In Linux or Android?

I can play wav file by the following ways. Remember to set correct device & card number for your SPDIF device.

[Linux]

aplay test.wav -D plughw:1,0

[Android]

tinyplay test.wav -D 1 -d 0

Best regards,

Daniel

Re: [Android] How to support SPDIF input feature?

brucequinton — Thu, 05 Jun 2014 08:13:00 GMT

Sorry, i'm using Linux, I can play a sound file.

I'm having trouble recording from the SPDIF.

Regards Bruce

Re: [Android] How to support SPDIF input feature?

danielhung — Thu, 05 Jun 2014 09:28:58 GMT

Hi Bruce,

Try this one. It works for me.

# arecord -D plughw:1,0 test.wav -v

Best regards,

Daniel

Re: [Android] How to support SPDIF input feature?

brucequinton — Thu, 05 Jun 2014 09:43:35 GMT

I get nothing at all, it just builds the wav header and no content. (I have tested that the input has data by using another PC)

if I use
#arecord -D hw:1,0 test.wav -v

I receive the following error: pcm_read:1801: read error: input/output error

Any change you package your kernel and modules into a tar file and shoot them to me?

Regards Bruce

Re: [Android] How to support SPDIF input feature?

danielhung — Thu, 05 Jun 2014 09:58:29 GMT

Sorry. I cannot share source code to you.

No idea about your question. Maybe you can check the configuration or permission for audio device.

Best regards,

Daniel

Re: [Android] How to support SPDIF input feature?

brucequinton — Thu, 05 Jun 2014 10:01:08 GMT

No problems at all, I understand.

Thank you for your help and your time. I appreciate your efforts.

Regards Bruce

Re: [Android] How to support SPDIF input feature?

YixingKong — Fri, 20 Jun 2014 01:44:57 GMT

weidong.sun, could you keep following this thread?

Thanks,

Yixing

Re: [Android] How to support SPDIF input feature?

YixingKong — Tue, 01 Jul 2014 02:27:57 GMT

Weidong, could you please continue to help the customer?

Thanks,

Yixing

Re: [Android] How to support SPDIF input feature?

danielhung — Wed, 09 Jul 2014 02:21:49 GMT

Hi Yixing & Weidong,

May I know do you have any update for this issue?

Thanks for your support.

Best regards,

Daniel

Re: [Android] How to support SPDIF input feature?

weidong_sun — Wed, 09 Jul 2014 06:56:16 GMT

Hi Daniel,

I confirmed the issue with R&D , In our android bsp, tinyalsa_hal.c supports SPDIF input, you can check this source code.

Regards,

Weidong

Re: [Android] How to support SPDIF input feature?

danielhung — Wed, 09 Jul 2014 09:32:08 GMT

Hi Weidong,

Yes. I see AUDIO_DEVICE_IN_AUX_DIGITAL device for SPDIF audio input in tinyalso HAL, but it seems not complete enough to work.

In my opinion, there should be more modifications in tinyalsa_hal.c and add SPDIF input configs in audio_policy.conf file.

Could you double confirm if SPDIF input device really work on Freescale sabresd demo board?

Thanks,

Daniel

Re: [Android] How to support SPDIF input feature?

sinanakman — Wed, 09 Jul 2014 16:08:13 GMT

Daniel, I am not running Android but I tested sabresd spdif input and under both FSL 3.0.5 as well mainline Linux kernel it works fine.

Hope this helps.

Sinan Akman

Re: [Android] How to support SPDIF input feature?

weidong_sun — Thu, 10 Jul 2014 08:50:17 GMT

Daniel,

I confirmed with tinyalsa_hal owner from R&D team, On our SabreSD board , there is not SPDIF input pin, so you can't use this board to test the funciton. On our sabreauto board, this function is supported.

If you want to sabresd board, you will have to adjust hardware, I mean you should make SPDIF signal output at first, then test it.

Regards,

weidong

Re: [Android] How to support SPDIF input feature?

danielhung — Thu, 10 Jul 2014 09:01:46 GMT

Sinan Akman,

Thank you. It also works fine on Linux kernel for me.

Daniel