From b9f3ae53723573c7ea52ea09da22359ebd41994d Mon Sep 17 00:00:00 2001
From: Stefan Seyfried <seife@tuxbox-git.slipkontur.de>
Date: Fri, 8 Jun 2012 22:17:30 +0200
Subject: [PATCH] spark: implement AC3 passthrough on SPDIF and HDMI

Note: untested (no hardware). AC3 on HDMI will only work if
AC3 on SPDIF is also selected.
---
 libspark/audio.cpp   | 18 ++++++++++++------
 libspark/audio_lib.h |  4 ++--
 2 files changed, 14 insertions(+), 8 deletions(-)

diff --git a/libspark/audio.cpp b/libspark/audio.cpp
index 142f000..74521ba 100644
--- a/libspark/audio.cpp
+++ b/libspark/audio.cpp
@@ -380,9 +380,17 @@ void cAudio::SetSRS(int /*iq_enable*/, int /*nmgr_enable*/, int /*iq_mode*/, int
 	lt_debug("%s\n", __FUNCTION__);
 };
 
+void cAudio::SetHdmiDD(bool enable)
+{
+	const char *opt[] = { "pcm", "spdif" };
+	lt_debug("%s %d\n", __func__, enable);
+	proc_put("/proc/stb/hdmi/audio_source", opt[enable], strlen(opt[enable]));
+}
+
 void cAudio::SetSpdifDD(bool enable)
 {
-	lt_debug("%s %d\n", __FUNCTION__, enable);
+	lt_debug("%s %d\n", __func__, enable);
+	setBypassMode(!enable);
 };
 
 void cAudio::ScheduleMute(bool On)
@@ -399,9 +407,7 @@ void cAudio::EnableAnalogOut(bool enable)
 #define AUDIO_BYPASS_OFF 1
 void cAudio::setBypassMode(bool disable)
 {
-	lt_debug("%s %d\n", __FUNCTION__, disable);
-	int mode = disable ? AUDIO_BYPASS_OFF : AUDIO_BYPASS_ON;
-	if (ioctl(fd, AUDIO_SET_BYPASS_MODE, mode) < 0)
-		lt_info("%s AUDIO_SET_BYPASS_MODE %d: %m\n", __func__, mode);
-	return;
+	const char *opt[] = { "passthrough", "downmix" };
+	lt_debug("%s %d\n", __func__, disable);
+	proc_put("/proc/stb/audio/ac3", opt[disable], strlen(opt[disable]));
 }
diff --git a/libspark/audio_lib.h b/libspark/audio_lib.h
index b19fb3b..74dce1a 100644
--- a/libspark/audio_lib.h
+++ b/libspark/audio_lib.h
@@ -86,8 +86,8 @@ class cAudio
 		int StopClip();
 		void getAudioInfo(int &type, int &layer, int& freq, int &bitrate, int &mode);
 		void SetSRS(int iq_enable, int nmgr_enable, int iq_mode, int iq_level);
-		bool IsHdmiDDSupported() { return false; };
-		void SetHdmiDD(bool) { return; };
+		bool IsHdmiDDSupported() { return true; };
+		void SetHdmiDD(bool enable);
 		void SetSpdifDD(bool enable);
 		void ScheduleMute(bool On);
 		void EnableAnalogOut(bool enable);