src: utils: Add ccaps to query compress device capabilities

[GitHub pull_request - opened <github@alsa-project.org>]

alsa-project/tinycompress pull request #39 was opened from ujfalusi:

Add a small utility to dump the capabilities of a compress device. It uses the same device selection style as cplay (-c card, -d device) and prints the protocol version, direction, fragment size/count limits and the list of supported codecs.

For each codec the SNDRV_COMPRESS_GET_CODEC_CAPS descriptors are printed as well. Drivers not implementing the codec caps ioctl are reported instead of treated as an error.

The direction is derived from the open flags by the core, so by default the device is opened for playback first and for capture as fallback. It can be forced with -D p|c.

Example output:

  $ ccaps -c0 -d50
  Compress device hw:0,50
    protocol version:  0.4.1
    direction:         playback
    fragment size:     38400 - 131072 bytes
    fragments:         3 - 64
    codecs:            4
    [0] AAC (0x6)
    [1] MP3 (0x2)
    [2] VORBIS (0x9)
    [3] PCM (0x1)

Request URL   : https://github.com/alsa-project/tinycompress/pull/39
Patch URL     : https://github.com/alsa-project/tinycompress/pull/39.patch
Repository URL: https://github.com/alsa-project/tinycompress