From ceafcc2ebbc4a86e4f5cbc6f188658a10fdc58b4 Mon Sep 17 00:00:00 2001
From: Chris Robinson <chris.kcat@gmail.com>
Date: Tue, 26 Feb 2013 10:19:33 -0800
Subject: [PATCH] Support float samples with ffmpeg

Requires the AL_EXT_FLOAT32 extension in OpenAL
---
 apps/openmw/mwrender/videoplayer.cpp    |  2 ++
 apps/openmw/mwsound/ffmpeg_decoder.cpp  |  2 ++
 apps/openmw/mwsound/openal_output.cpp   | 45 +++++++++++++++++++++++++
 apps/openmw/mwsound/sound_decoder.hpp   |  3 +-
 apps/openmw/mwsound/soundmanagerimp.cpp |  2 ++
 5 files changed, 53 insertions(+), 1 deletion(-)

diff --git a/apps/openmw/mwrender/videoplayer.cpp b/apps/openmw/mwrender/videoplayer.cpp
index b71022504..a0dedb6bc 100644
--- a/apps/openmw/mwrender/videoplayer.cpp
+++ b/apps/openmw/mwrender/videoplayer.cpp
@@ -404,6 +404,8 @@ public:
             *type = MWSound::SampleType_UInt8;
         else if(mAVStream->codec->sample_fmt == AV_SAMPLE_FMT_S16)
             *type = MWSound::SampleType_Int16;
+        else if(mAVStream->codec->sample_fmt == AV_SAMPLE_FMT_FLT)
+            *type = MWSound::SampleType_Float32;
         else
             fail(std::string("Unsupported sample format: ")+
                  av_get_sample_fmt_name(mAVStream->codec->sample_fmt));
diff --git a/apps/openmw/mwsound/ffmpeg_decoder.cpp b/apps/openmw/mwsound/ffmpeg_decoder.cpp
index 54df45ff4..8c857f4ea 100644
--- a/apps/openmw/mwsound/ffmpeg_decoder.cpp
+++ b/apps/openmw/mwsound/ffmpeg_decoder.cpp
@@ -224,6 +224,8 @@ void FFmpeg_Decoder::getInfo(int *samplerate, ChannelConfig *chans, SampleType *
         *type = SampleType_UInt8;
     else if((*mStream)->codec->sample_fmt == AV_SAMPLE_FMT_S16)
         *type = SampleType_Int16;
+    else if((*mStream)->codec->sample_fmt == AV_SAMPLE_FMT_FLT)
+        *type = SampleType_Float32;
     else
         fail(std::string("Unsupported sample format: ")+
              av_get_sample_fmt_name((*mStream)->codec->sample_fmt));
diff --git a/apps/openmw/mwsound/openal_output.cpp b/apps/openmw/mwsound/openal_output.cpp
index 67008e2bc..1dc5f9974 100644
--- a/apps/openmw/mwsound/openal_output.cpp
+++ b/apps/openmw/mwsound/openal_output.cpp
@@ -88,6 +88,51 @@ static ALenum getALFormat(ChannelConfig chans, SampleType type)
             }
         }
     }
+    if(alIsExtensionPresent("AL_EXT_FLOAT32"))
+    {
+        static const struct {
+            char name[32];
+            ChannelConfig chans;
+            SampleType type;
+        } fltfmtlist[] = {
+            { "AL_FORMAT_MONO_FLOAT32",   ChannelConfig_Mono,   SampleType_Float32 },
+            { "AL_FORMAT_STEREO_FLOAT32", ChannelConfig_Stereo, SampleType_Float32 },
+        };
+        static const size_t fltfmtlistsize = sizeof(fltfmtlist)/sizeof(fltfmtlist[0]);
+
+        for(size_t i = 0;i < fltfmtlistsize;i++)
+        {
+            if(fltfmtlist[i].chans == chans && fltfmtlist[i].type == type)
+            {
+                ALenum format = alGetEnumValue(fltfmtlist[i].name);
+                if(format != 0 && format != -1)
+                    return format;
+            }
+        }
+        if(alIsExtensionPresent("AL_EXT_MCFORMATS"))
+        {
+            static const struct {
+                char name[32];
+                ChannelConfig chans;
+                SampleType type;
+            } fltmcfmtlist[] = {
+                { "AL_FORMAT_QUAD32",  ChannelConfig_Quad,    SampleType_Float32 },
+                { "AL_FORMAT_51CHN32", ChannelConfig_5point1, SampleType_Float32 },
+                { "AL_FORMAT_71CHN32", ChannelConfig_7point1, SampleType_Float32 },
+            };
+            static const size_t fltmcfmtlistsize = sizeof(fltmcfmtlist)/sizeof(fltmcfmtlist[0]);
+
+            for(size_t i = 0;i < fltmcfmtlistsize;i++)
+            {
+                if(fltmcfmtlist[i].chans == chans && fltmcfmtlist[i].type == type)
+                {
+                    ALenum format = alGetEnumValue(fltmcfmtlist[i].name);
+                    if(format != 0 && format != -1)
+                        return format;
+                }
+            }
+        }
+    }
 
     fail(std::string("Unsupported sound format (")+getChannelConfigName(chans)+", "+getSampleTypeName(type)+")");
     return AL_NONE;
diff --git a/apps/openmw/mwsound/sound_decoder.hpp b/apps/openmw/mwsound/sound_decoder.hpp
index 29d99e8fa..151b58036 100644
--- a/apps/openmw/mwsound/sound_decoder.hpp
+++ b/apps/openmw/mwsound/sound_decoder.hpp
@@ -9,7 +9,8 @@ namespace MWSound
 {
     enum SampleType {
         SampleType_UInt8,
-        SampleType_Int16
+        SampleType_Int16,
+        SampleType_Float32
     };
     const char *getSampleTypeName(SampleType type);
 
diff --git a/apps/openmw/mwsound/soundmanagerimp.cpp b/apps/openmw/mwsound/soundmanagerimp.cpp
index c50290680..1b07dfe62 100644
--- a/apps/openmw/mwsound/soundmanagerimp.cpp
+++ b/apps/openmw/mwsound/soundmanagerimp.cpp
@@ -607,6 +607,7 @@ namespace MWSound
         {
             case SampleType_UInt8: return "U8";
             case SampleType_Int16: return "S16";
+            case SampleType_Float32: return "Float32";
         }
         return "(unknown sample type)";
     }
@@ -638,6 +639,7 @@ namespace MWSound
         {
             case SampleType_UInt8: frames *= 1; break;
             case SampleType_Int16: frames *= 2; break;
+            case SampleType_Float32: frames *= 4; break;
         }
         return frames;
     }