topology: pre-processor: Add support for object arrays

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

alsa-project/alsa-utils pull request #216 was edited from ranj063:

Introduce a new keyword, "Objects" to instantiate multiple objects of the same class with different attirbutes. For example

Objects.Base.input_audio_format [
	{
		in_rate [
			8000
			16000
			48000
		]
		in_bit_depth [
			32
		]
		in_valid_bit_depth [
			24
			32
		]
	}
]

This would be expanded into 6 objects with the rate, bit_depth and valid_bit_depth combinations of the arrays of values above.

Object.Base.input_audio_format [
	{
		in_rate 8000
		in_bit_depth 32
		in_valid_bit_depth 32
	}
	{
		in_rate 16000
		in_bit_depth 32
		in_valid_bit_depth 32
	}
	{
		in_rate 48000
		in_bit_depth 32
		in_valid_bit_depth 32
	}
	{
		in_rate 8000
		in_bit_depth 32
		in_valid_bit_depth 24
	}
	{
		in_rate 16000
		in_bit_depth 32
		in_valid_bit_depth 24
	}
	{
		in_rate 48000
		in_bit_depth 32
		in_valid_bit_depth 24
	}
]

The Objects definition is an array so that multiple combinations can be specified so that we deal with only valid combinations. For example, 16-bit bit_depth is only valid with 16-bit valid_bit_depth. So if we also want to add those combinations with the multiple rates, the definition would look like:

Objects.Base.input_audio_format [
        {
                in_rate [
                        8000
                        16000
                        48000
                ]
                in_bit_depth [
                        32
                ]
                in_valid_bit_depth [
                        24
                        32
                ]
        }
        {
                in_rate [
                        8000
                        16000
                        48000
                ]
                in_bit_depth [
                        16
                ]
                in_valid_bit_depth [
                        16
                ]
        }
]

Request URL   : https://github.com/alsa-project/alsa-utils/pull/216
Patch URL     : https://github.com/alsa-project/alsa-utils/pull/216.patch
Repository URL: https://github.com/alsa-project/alsa-utils