[Android] How to support SPDIF input feature?

[charleshuang]

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

[brucequinton]

No problems at all, I understand.

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

Regards Bruce