VLCKit/MobileVLCKit/patches/0015-Add-AC-3-pass-through.patch

From e8dac1564e09125dfb73862f71f26a69944c4881 Mon Sep 17 00:00:00 2001
From: Aman Gupta <aman@tmm1.net>
Date: Tue, 1 Mar 2016 16:31:13 +0100
Subject: [PATCH 15/15] Add AC-3 pass-through
MIME-Version: 1.0
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Signed-off-by: Felix Paul Kühne <fkuehne@videolan.org>
---
 extras/package/ios/build.sh          |  2 --
 include/vlc/libvlc_media_player.h    | 10 +++++++++
 lib/audio.c                          | 16 +++++++++++++++
 lib/media_player.c                   |  1 +
 modules/audio_output/audiounit_ios.m | 39 +++++++++++++++++++++++++++---------
 5 files changed, 56 insertions(+), 12 deletions(-)

diff --git a/extras/package/ios/build.sh b/extras/package/ios/build.sh
index 8ea32c4..af7933a 100755
--- a/extras/package/ios/build.sh
+++ b/extras/package/ios/build.sh
@@ -461,8 +461,6 @@ speex_resampler
 remoteosd
 magnify
 gradient
-tospdif
-dtstofloat32
 logger
 visual
 fb
diff --git a/include/vlc/libvlc_media_player.h b/include/vlc/libvlc_media_player.h
index 3a37d3b..90a27af 100644
--- a/include/vlc/libvlc_media_player.h
+++ b/include/vlc/libvlc_media_player.h
@@ -1831,6 +1831,16 @@ LIBVLC_API int64_t libvlc_audio_get_delay( libvlc_media_player_t *p_mi );
 LIBVLC_API int libvlc_audio_set_delay( libvlc_media_player_t *p_mi, int64_t i_delay );
 
 /**
+ * Set audio spdif mode.
+ *
+ * \param p_mi media player
+ * \param enabled the spdif state
+ * \return 0 on success, -1 on error
+ * \version LibVLC 2.x.x or later
+ */
+LIBVLC_API int libvlc_audio_set_spdif( libvlc_media_player_t *p_mi, bool enabled );
+
+/**
  * Get the number of equalizer presets.
  *
  * \return number of presets
diff --git a/lib/audio.c b/lib/audio.c
index 7901c64..3877311 100644
--- a/lib/audio.c
+++ b/lib/audio.c
@@ -472,6 +472,22 @@ int libvlc_audio_set_channel( libvlc_media_player_t *mp, int channel )
 }
 
 /*****************************************************************************
+ * libvlc_audio_set_spdif : Enable/disable spdif mode
+ *****************************************************************************/
+int libvlc_audio_set_spdif( libvlc_media_player_t *p_mi, bool enabled )
+{
+    int ret = 0;
+
+    if( var_SetBool( p_mi, "spdif", enabled ) < 0 )
+    {
+        libvlc_printerr( "Error setting 'spdif'" );
+        ret = -1;
+    }
+
+    return ret;
+}
+
+/*****************************************************************************
  * libvlc_audio_get_delay : Get the current audio delay
  *****************************************************************************/
 int64_t libvlc_audio_get_delay( libvlc_media_player_t *p_mi )
diff --git a/lib/media_player.c b/lib/media_player.c
index 143e240..ac30787 100644
--- a/lib/media_player.c
+++ b/lib/media_player.c
@@ -641,6 +641,7 @@ libvlc_media_player_new( libvlc_instance_t *instance )
     var_Create (mp, "zoom", VLC_VAR_FLOAT | VLC_VAR_DOINHERIT);
     var_Create (mp, "aspect-ratio", VLC_VAR_STRING);
     var_Create (mp, "crop", VLC_VAR_STRING);
+    var_Create (mp, "spdif", VLC_VAR_BOOL | VLC_VAR_DOINHERIT);
     var_Create (mp, "deinterlace", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT);
     var_Create (mp, "deinterlace-mode", VLC_VAR_STRING);
 
diff --git a/modules/audio_output/audiounit_ios.m b/modules/audio_output/audiounit_ios.m
index cee8eab..0aa9dee 100644
--- a/modules/audio_output/audiounit_ios.m
+++ b/modules/audio_output/audiounit_ios.m
@@ -201,16 +201,34 @@ static int StartAnalog(audio_output_t *p_aout, audio_sample_format_t *fmt)
     if (status != noErr)
         msg_Warn(p_aout, "failed to set IO mode (%i)", (int)status);
 
+    AVAudioSession *instance = [AVAudioSession sharedInstance];
+
     /* Get the current format */
     AudioStreamBasicDescription streamDescription;
     streamDescription.mSampleRate = fmt->i_rate;
-    fmt->i_format = VLC_CODEC_FL32;
-    fmt->i_physical_channels = fmt->i_original_channels = AOUT_CHANS_STEREO;
     streamDescription.mFormatID = kAudioFormatLinearPCM;
-    streamDescription.mFormatFlags = kAudioFormatFlagsNativeFloatPacked; // FL32
-    streamDescription.mChannelsPerFrame = aout_FormatNbChannels(fmt);
-    streamDescription.mFramesPerPacket = 1;
-    streamDescription.mBitsPerChannel = 32;
+
+    if (AOUT_FMT_SPDIF(fmt) && var_InheritBool(p_aout, "spdif")) {
+        // request spdif
+        fmt->i_format = VLC_CODEC_SPDIFL;
+        fmt->i_bytes_per_frame = AOUT_SPDIF_SIZE;
+        fmt->i_frame_length = A52_FRAME_NB;
+
+        streamDescription.mFormatFlags = kLinearPCMFormatFlagIsSignedInteger | kLinearPCMFormatFlagIsPacked; // S16LE
+        streamDescription.mChannelsPerFrame = 2;
+        streamDescription.mFramesPerPacket = 1;
+        streamDescription.mBitsPerChannel = 16;
+    } else {
+        // request fl32 pcm
+        fmt->i_format = VLC_CODEC_FL32;
+        fmt->i_physical_channels = fmt->i_original_channels = AOUT_CHANS_STEREO;
+
+        streamDescription.mFormatFlags = kAudioFormatFlagsNativeFloatPacked; // FL32
+        streamDescription.mChannelsPerFrame = aout_FormatNbChannels(fmt);
+        streamDescription.mFramesPerPacket = 1;
+        streamDescription.mBitsPerChannel = 32;
+    }
+
     streamDescription.mBytesPerFrame = streamDescription.mBitsPerChannel * streamDescription.mChannelsPerFrame / 8;
     streamDescription.mBytesPerPacket = streamDescription.mBytesPerFrame * streamDescription.mFramesPerPacket;
     i_param_size = sizeof(streamDescription);
@@ -265,10 +283,11 @@ static int StartAnalog(audio_output_t *p_aout, audio_sample_format_t *fmt)
     }
 
     /* setup circular buffer */
-    TPCircularBufferInit(&p_sys->circular_buffer, AUDIO_BUFFER_SIZE_IN_SECONDS * fmt->i_rate * fmt->i_bytes_per_frame);
-
-    /* start audio session so playback continues if mute switch is on */
-    AVAudioSession *instance = [AVAudioSession sharedInstance];
+    if (fmt->i_format == VLC_CODEC_SPDIFL) {
+        TPCircularBufferInit(&p_sys->circular_buffer, 200 * AOUT_SPDIF_SIZE);
+    } else {
+        TPCircularBufferInit(&p_sys->circular_buffer, AUDIO_BUFFER_SIZE_IN_SECONDS * fmt->i_rate * fmt->i_bytes_per_frame);
+    }
 
     /* Set audio session to mediaplayback */
     NSError *error = nil;
-- 
2.9.2