Add PCM "hdmi"

Added the new PCM "hdmi" for HDA-Intel.
It's still experimental.

src/conf/pcm/Makefile.am

@@ -1,7 +1,7 @@
 cfg_files = default.conf front.conf rear.conf center_lfe.conf side.conf\
 	    surround40.conf surround41.conf \
 	    surround50.conf surround51.conf \
-	    surround71.conf iec958.conf modem.conf \
+	    surround71.conf iec958.conf hdmi.conf modem.conf \
 	    dmix.conf dsnoop.conf \
 	    dpl.conf
 

src/conf/pcm/hdmi.conf

@@ -0,0 +1,83 @@
+#
+#  Hardware output from HDMI
+#
+
+pcm.!hdmi {
+	@args [ CARD DEV AES0 AES1 AES2 AES3 ]
+	@args.CARD {
+		type string
+		default {
+			@func getenv
+			vars [
+				ALSA_IEC958_CARD
+				ALSA_PCM_CARD
+				ALSA_CARD
+			]
+			default {
+				@func refer
+				name defaults.pcm.iec958.card
+			}
+		}
+	}
+	@args.DEV {
+		type integer
+		default {
+			@func igetenv
+			vars [
+				ALSA_IEC958_DEVICE
+			]
+			default {
+				@func refer
+				name defaults.pcm.iec958.device
+			}
+		}
+	}
+	@args.AES0 {
+		type integer
+		# consumer, not-copyright, emphasis-none, mode=0
+		default 0x04
+	}
+	@args.AES1 {
+		type integer
+		# original, PCM coder
+		default 0x82
+	}
+	@args.AES2 {
+		type integer
+		# source and channel
+		default 0x00
+	}
+	@args.AES3 {
+		type integer
+		# fs=48000Hz, clock accuracy=1000ppm
+		default 0x02
+	}
+	type empty
+	slave.pcm {
+		@func refer
+		name {
+			@func concat
+			strings [
+				"cards."
+				{
+					@func card_driver
+					card $CARD
+				}
+				".pcm.hdmi." $DEV ":"
+				"CARD=" $CARD ","
+				"AES0=" $AES0 ","
+				"AES1=" $AES1 ","
+				"AES2=" $AES2 ","
+				"AES3=" $AES3
+			]
+		}
+	}
+	hint {
+		show {
+			@func refer
+			name defaults.namehint.basic
+		}
+		description "HDMI Audio Output"
+		device $DEV
+	}
+}