From 75dbaf8b8bc4b3f10033ef6e7d1a00475ed5db62 Mon Sep 17 00:00:00 2001
From: Steinar Gunderson <sgunderson@bigfoot.com>
Date: Fri, 24 Sep 2010 23:36:36 +0200
Subject: [PATCH] Parametrize SDI audio rate and channels.

---
 modules/access/sdi.cpp | 35 +++++++++++++++++++++++++++--------
 1 file changed, 27 insertions(+), 8 deletions(-)

diff --git a/modules/access/sdi.cpp b/modules/access/sdi.cpp
index 266937451e..0613bf8f62 100644
--- a/modules/access/sdi.cpp
+++ b/modules/access/sdi.cpp
@@ -36,6 +36,16 @@ static void Close( vlc_object_t * );
     "Caching value for SDI captures. This " \
     "value should be set in milliseconds." )
 
+#define RATE_TEXT N_("Audio sampling rate in Hz")
+#define RATE_LONGTEXT N_( \
+    "Audio sampling rate (in hertz) for SDI captures. " \
+    "0 disables audio input." )
+
+#define CHANNELS_TEXT N_("Number of audio channels")
+#define CHANNELS_LONGTEXT N_( \
+    "Number of input audio channels for SDI captures. " \
+    "Must be 2, 8 or 16. 0 disables audio input." )
+
 vlc_module_begin ()
     set_shortname( N_("SDI") )
     set_description( N_("BlackMagic SDI input") )
@@ -46,6 +56,10 @@ vlc_module_begin ()
                  MODE_TEXT, MODE_LONGTEXT, true )
     add_integer( "sdi-caching", DEFAULT_PTS_DELAY / 1000, NULL,
                  CACHING_TEXT, CACHING_LONGTEXT, true )
+    add_integer( "sdi-audio-rate", 48000, NULL,
+                 RATE_TEXT, RATE_LONGTEXT, true )
+    add_integer( "sdi-audio-channels", 2, NULL,
+                 CHANNELS_TEXT, CHANNELS_LONGTEXT, true )
 
     add_shortcut( "sdi" )
     set_capability( "access_demux", 10 )
@@ -147,7 +161,7 @@ HRESULT DeckLinkCaptureDelegate::VideoInputFrameArrived(IDeckLinkVideoInputFrame
     
     if( audioFrame )
     {
-        const int i_bytes = audioFrame->GetSampleFrameCount() * sizeof(int16_t) * 2;
+        const int i_bytes = audioFrame->GetSampleFrameCount() * sizeof(int16_t) * p_sys->i_channels;
 
         p_audio_frame = block_New( p_demux_, i_bytes );
         if( !p_audio_frame )
@@ -333,13 +347,18 @@ static int Open( vlc_object_t *p_this )
         return VLC_EGENERIC;
     }
    
-    result = p_sys->p_input->EnableAudioInput( 48000, bmdAudioSampleType16bitInteger, 2 );
-    if( result != S_OK )
+    int i_rate = var_CreateGetInteger( p_demux, "sdi-audio-rate" );
+    int i_channels = var_CreateGetInteger( p_demux, "sdi-audio-channels" );
+    if( i_rate > 0 && i_channels > 0 )
     {
-        msg_Err( p_demux, "Failed to enable audio input" );
-        return VLC_EGENERIC;
+        result = p_sys->p_input->EnableAudioInput( i_rate, bmdAudioSampleType16bitInteger, i_channels );
+        if( result != S_OK )
+        {
+            msg_Err( p_demux, "Failed to enable audio input" );
+            return VLC_EGENERIC;
+        }
     }
-    
+ 
     p_sys->p_delegate = new DeckLinkCaptureDelegate( p_demux );
     p_sys->p_input->SetCallback( p_sys->p_delegate );
 
@@ -367,8 +386,8 @@ static int Open( vlc_object_t *p_this )
     
     es_format_t audio_fmt;
     es_format_Init( &audio_fmt, AUDIO_ES, VLC_CODEC_S16N );
-    audio_fmt.audio.i_channels = 2;
-    audio_fmt.audio.i_rate = 48000;
+    audio_fmt.audio.i_channels = i_channels;
+    audio_fmt.audio.i_rate = i_rate;
     audio_fmt.audio.i_bitspersample = 16;
     audio_fmt.audio.i_blockalign = audio_fmt.audio.i_channels * audio_fmt.audio.i_bitspersample / 8;
     audio_fmt.i_bitrate = audio_fmt.audio.i_channels * audio_fmt.audio.i_rate * audio_fmt.audio.i_bitspersample;
-- 
2.39.2