编辑文件 - dmix.conf

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路径: /usr/share/alsa/pcm/dmix.conf
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#
# dmix output
#

pcm.!dmix {
	@args [ CARD DEV SUBDEV FORMAT RATE ]
	@args.CARD {
		type string
		default {
			@func refer
			name defaults.pcm.dmix.card
		}
	}
	@args.DEV {
		type integer
		default {
			@func refer
			name defaults.pcm.dmix.device
		}
	}
	@args.SUBDEV {
		type integer
		default 0
	}
	@args.FORMAT {
		type string
		default {
			@func refer
			name defaults.pcm.dmix.format
		}
	}
	@args.RATE {
		type integer
		default {
			@func refer
			name defaults.pcm.dmix.rate
		}
	}
	type dmix
	ipc_key {
		@func refer
		name defaults.pcm.ipc_key
	}
	ipc_gid {
		@func refer
		name defaults.pcm.ipc_gid
	}
	ipc_perm {
		@func refer
		name defaults.pcm.ipc_perm
	}
	slave {
		pcm {
			type hw
			card $CARD
			device $DEV
			subdevice $SUBDEV
		}
		format $FORMAT
		rate $RATE
		period_size {
			@func refer
			name {
				@func concat
				strings [
					"defaults.dmix."
					{
						@func card_driver
						card $CARD
					}
					".period_size"
				]
			}
			default 1024
		}		
		period_time {
			@func refer
			name {
				@func concat
				strings [
					"defaults.dmix."
					{
						@func card_driver
						card $CARD
					}
					".period_time"
				]
			}
			default -1
		}		
		periods {
			@func refer
			name {
				@func concat
				strings [
					"defaults.dmix."
					{
						@func card_driver
						card $CARD
					}
					".periods"
				]
			}
			default 16
		}
	}
	hint {
		show {
			@func refer
			name defaults.namehint.extended
		}
		description "Direct sample mixing device"
		device_output $DEV
	}
}

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