From ed882e25cb2f7be41f218244381bc916413aeae0 Mon Sep 17 00:00:00 2001
From: Christopher Snowhill <kode54@gmail.com>
Date: Tue, 11 Jan 2022 18:19:30 -0800
Subject: [PATCH] Cog Audio: Resampler now extrapolates into latency padding
 for better gapless playback

---
 Audio/Chain/ConverterNode.m              |  71 ++-
 Audio/CogAudio.xcodeproj/project.pbxproj | 731 ++++++++++++++---------
 ThirdParty/Vorbis/lpc.c                  | 156 +++++
 ThirdParty/Vorbis/lpc.h                  |  27 +
 4 files changed, 681 insertions(+), 304 deletions(-)
 create mode 100644 ThirdParty/Vorbis/lpc.c
 create mode 100644 ThirdParty/Vorbis/lpc.h

diff --git a/Audio/Chain/ConverterNode.m b/Audio/Chain/ConverterNode.m
index bb6bd94e0..63dd0481e 100644
--- a/Audio/Chain/ConverterNode.m
+++ b/Audio/Chain/ConverterNode.m
@@ -13,6 +13,8 @@
 #import <audio/conversion/s16_to_float.h>
 #import <audio/conversion/s32_to_float.h>
 
+#import "lpc.h"
+
 void PrintStreamDesc (AudioStreamBasicDescription *inDesc)
 {
 	if (!inDesc) {
@@ -368,6 +370,32 @@ static void convert_be_to_le(uint8_t *buffer, size_t bitsPerSample, size_t bytes
     }
 }
 
+static const int extrapolate_order = 16;
+
+static void extrapolate(float *buffer, size_t channels, size_t frameSize, size_t size, BOOL backward)
+{
+    const size_t delta = (backward ? -1 : 1) * channels;
+    
+    float lpc[extrapolate_order];
+    float work[frameSize];
+    
+    for (size_t ch = 0; ch < channels; ch++)
+    {
+        if (frameSize - size > extrapolate_order * 2)
+        {
+            float *chPcmBuf = buffer + ch + (backward ? frameSize : -1) * channels;
+            for (size_t i = 0; i < frameSize; i++) work[i] = *(chPcmBuf += delta);
+            
+            vorbis_lpc_from_data(work, lpc, (int)(frameSize - size), extrapolate_order);
+            
+            vorbis_lpc_predict(lpc, work + frameSize - size - extrapolate_order, extrapolate_order, work + frameSize - size, size);
+            
+            chPcmBuf = buffer + ch + (backward ? frameSize : -1) * channels;
+            for (size_t i = 0; i < frameSize; i++) *(chPcmBuf += delta) = work[i];
+        }
+    }
+}
+
 -(void)process
 {
 	char writeBuf[CHUNK_SIZE];	
@@ -384,7 +412,11 @@ static void convert_be_to_le(uint8_t *buffer, size_t bitsPerSample, size_t bytes
 	UInt32 ioNumberPackets;
     int amountReadFromFC;
     int amountRead = 0;
-    
+    int extrapolateStart = 0;
+    int extrapolateEnd = 0;
+    size_t amountToSkip = 0;
+    BOOL inputRetry = NO;
+
     if (emittingSilence)
     {
         memset(dest, 0, amount);
@@ -416,6 +448,9 @@ tryagain:
         if (!inputBuffer || inputBufferSize < newSize)
             inputBuffer = realloc( inputBuffer, inputBufferSize = newSize * 3 );
         
+        // Pad end of track with floats. For simplicity, pad start in track
+        // native format.
+        
         if (stopping || [self shouldContinue] == NO || [self endOfStream] == YES)
         {
             if (!skipResampler && !latencyPostfill)
@@ -425,6 +460,12 @@ tryagain:
                 if (!inputBuffer || inputBufferSize < newSize)
                     inputBuffer = realloc( inputBuffer, inputBufferSize = newSize * 64);
                 
+                extrapolateEnd = ioNumberPackets;
+                
+                // Extrapolate end samples
+                if (inpSize)
+                    extrapolate( inputBuffer, floatFormat.mChannelsPerFrame, inpSize / floatFormat.mBytesPerPacket, extrapolateEnd, NO);
+                
                 inpSize = newSize;
                 inpOffset = 0;
                 latencyPostfill = YES;
@@ -438,13 +479,17 @@ tryagain:
         }
 
         size_t amountToWrite = ioNumberPackets * inputFormat.mBytesPerPacket;
-        size_t amountToSkip = 0;
+        if (!inputRetry) amountToSkip = 0;
         
+        BOOL isFloat = !!(inputFormat.mFormatFlags & kAudioFormatFlagIsFloat);
+        BOOL isUnsigned = !isFloat && !(inputFormat.mFormatFlags & kAudioFormatFlagIsSignedInteger);
+
         if (!skipResampler)
         {
             if (latencyStarted < 0)
             {
                 latencyStarted = resampler->latency(resampler_data);
+                extrapolateStart = (int)latencyStarted;
             }
 
             if (latencyStarted)
@@ -452,8 +497,8 @@ tryagain:
                 size_t latencyToWrite = latencyStarted * inputFormat.mBytesPerPacket;
                 if (latencyToWrite > amountToWrite)
                     latencyToWrite = amountToWrite;
-            
-                if (inputFormat.mBitsPerChannel <= 8)
+                
+                if (isUnsigned)
                     memset(inputBuffer, 0x80, latencyToWrite);
                 else
                     memset(inputBuffer, 0, latencyToWrite);
@@ -467,9 +512,15 @@ tryagain:
             }
         }
                 
-        size_t bytesReadFromInput = [self readData:inputBuffer + amountToSkip amount:(int)amountToWrite] + amountToSkip;
+        size_t bytesReadFromInput = [self readData:inputBuffer + amountToSkip amount:(int)amountToWrite];
         
-        BOOL isFloat = !!(inputFormat.mFormatFlags & kAudioFormatFlagIsFloat);
+        if (!bytesReadFromInput)
+        {
+            inputRetry = YES;
+            continue;
+        }
+        
+        bytesReadFromInput += amountToSkip;
         
         if (bytesReadFromInput &&
             (inputFormat.mFormatFlags & kAudioFormatFlagIsBigEndian))
@@ -490,7 +541,6 @@ tryagain:
         if (bytesReadFromInput && !isFloat)
         {
             size_t bitsPerSample = inputFormat.mBitsPerChannel;
-            BOOL isUnsigned = !(inputFormat.mFormatFlags & kAudioFormatFlagIsSignedInteger);
             if (bitsPerSample <= 8) {
                 samplesRead = bytesReadFromInput;
                 if (isUnsigned)
@@ -537,6 +587,13 @@ tryagain:
             }
         }
         
+        // Extrapolate start
+        if (extrapolateStart)
+         {
+            extrapolate( inputBuffer, floatFormat.mChannelsPerFrame, bytesReadFromInput / floatFormat.mBytesPerPacket, extrapolateStart, YES);
+            extrapolateStart = 0;
+        }
+        
         // Input now contains bytesReadFromInput worth of floats, in the input sample rate
         inpSize = bytesReadFromInput;
         inpOffset = 0;
diff --git a/Audio/CogAudio.xcodeproj/project.pbxproj b/Audio/CogAudio.xcodeproj/project.pbxproj
index 46c489c43..85fe67412 100644
--- a/Audio/CogAudio.xcodeproj/project.pbxproj
+++ b/Audio/CogAudio.xcodeproj/project.pbxproj
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-				832BEEB1278D4A32005E1BC4 /* include */,
-				832BEE93278D412D005E1BC4 /* audio_resampler.c */,
-				832BEE97278D4462005E1BC4 /* config_file_userdata.c */,
-				832BEE9B278D451D005E1BC4 /* config_file.c */,
-				832BEEAB278D4848005E1BC4 /* encoding_utf.c */,
-				832BEE8F278D40F7005E1BC4 /* features_cpu.c */,
-				832BEEA9278D47FB005E1BC4 /* file_path_io.c */,
-				832BEEA3278D469D005E1BC4 /* file_path.c */,
-				832BEE9F278D460F005E1BC4 /* file_stream.c */,
-				832BEE99278D4473005E1BC4 /* memalign.c */,
-				832BEEAD278D4853005E1BC4 /* rtime.c */,
-				832BEE91278D4109005E1BC4 /* s16_to_float.c */,
-				832BEEAF278D48C1005E1BC4 /* s32_to_float.c */,
-				832BEE95278D414A005E1BC4 /* sinc_resampler.c */,
-				832BEEA7278D47F0005E1BC4 /* stdstring.c */,
-				832BEE9D278D452C005E1BC4 /* string_list.c */,
-				832BEEA5278D4755005E1BC4 /* vfs_implementation.c */,
-				832BEEA1278D464B005E1BC4 /* config.h */,
+				8389F2A0278E646E0074164C /* Vorbis */,
+				8389F224278E64590074164C /* RetroArch */,
 			);
 			name = ThirdParty;
 			sourceTree = "<group>";
 		};
-		832BEEB1278D4A32005E1BC4 /* include */ = {
-			isa = PBXGroup;
-			children = (
-				832BEEC7278D4A32005E1BC4 /* array */,
-				832BEED3278D4A32005E1BC4 /* audio */,
-				832BEED2278D4A32005E1BC4 /* boolean.h */,
-				832BEEB8278D4A32005E1BC4 /* compat */,
-				832BEEB2278D4A32005E1BC4 /* encodings */,
-				832BEECD278D4A32005E1BC4 /* features */,
-				832BEEC2278D4A32005E1BC4 /* file */,
-				832BEEDC278D4A32005E1BC4 /* filters.h */,
-				832BEED8278D4A32005E1BC4 /* libretro.h */,
-				832BEEC0278D4A32005E1BC4 /* lists */,
-				832BEEB4278D4A32005E1BC4 /* memalign.h */,
-				832BEED9278D4A32005E1BC4 /* retro_assert.h */,
-				832BEEBE278D4A32005E1BC4 /* retro_common_api.h */,
-				832BEEC6278D4A32005E1BC4 /* retro_environment.h */,
-				832BEEC9278D4A32005E1BC4 /* retro_inline.h */,
-				832BEECA278D4A32005E1BC4 /* retro_math.h */,
-				832BEECF278D4A32005E1BC4 /* retro_miscellaneous.h */,
-				832BEEBF278D4A32005E1BC4 /* retro_timers.h */,
-				832BEECB278D4A32005E1BC4 /* streams */,
-				832BEEDA278D4A32005E1BC4 /* string */,
-				832BEED0278D4A32005E1BC4 /* time */,
-				832BEEB5278D4A32005E1BC4 /* vfs */,
-			);
-			name = include;
-			path = "../ThirdParty/RetroArch/libretro-common/include";
-			sourceTree = "<group>";
-		};
-		832BEEB2278D4A32005E1BC4 /* encodings */ = {
-			isa = PBXGroup;
-			children = (
-				832BEEB3278D4A32005E1BC4 /* utf.h */,
-			);
-			path = encodings;
-			sourceTree = "<group>";
-		};
-		832BEEB5278D4A32005E1BC4 /* vfs */ = {
-			isa = PBXGroup;
-			children = (
-				832BEEB6278D4A32005E1BC4 /* vfs.h */,
-				832BEEB7278D4A32005E1BC4 /* vfs_implementation.h */,
-			);
-			path = vfs;
-			sourceTree = "<group>";
-		};
-		832BEEB8278D4A32005E1BC4 /* compat */ = {
-			isa = PBXGroup;
-			children = (
-				832BEEB9278D4A32005E1BC4 /* strl.h */,
-				832BEEBA278D4A32005E1BC4 /* strcasestr.h */,
-				832BEEBB278D4A32005E1BC4 /* fopen_utf8.h */,
-				832BEEBC278D4A32005E1BC4 /* posix_string.h */,
-				832BEEBD278D4A32005E1BC4 /* msvc.h */,
-			);
-			path = compat;
-			sourceTree = "<group>";
-		};
-		832BEEC0278D4A32005E1BC4 /* lists */ = {
-			isa = PBXGroup;
-			children = (
-				832BEEC1278D4A32005E1BC4 /* string_list.h */,
-			);
-			path = lists;
-			sourceTree = "<group>";
-		};
-		832BEEC2278D4A32005E1BC4 /* file */ = {
-			isa = PBXGroup;
-			children = (
-				832BEEC3278D4A32005E1BC4 /* config_file.h */,
-				832BEEC4278D4A32005E1BC4 /* config_file_userdata.h */,
-				832BEEC5278D4A32005E1BC4 /* file_path.h */,
-			);
-			path = file;
-			sourceTree = "<group>";
-		};
-		832BEEC7278D4A32005E1BC4 /* array */ = {
-			isa = PBXGroup;
-			children = (
-				832BEEC8278D4A32005E1BC4 /* rhmap.h */,
-			);
-			path = array;
-			sourceTree = "<group>";
-		};
-		832BEECB278D4A32005E1BC4 /* streams */ = {
-			isa = PBXGroup;
-			children = (
-				832BEECC278D4A32005E1BC4 /* file_stream.h */,
-			);
-			path = streams;
-			sourceTree = "<group>";
-		};
-		832BEECD278D4A32005E1BC4 /* features */ = {
-			isa = PBXGroup;
-			children = (
-				832BEECE278D4A32005E1BC4 /* features_cpu.h */,
-			);
-			path = features;
-			sourceTree = "<group>";
-		};
-		832BEED0278D4A32005E1BC4 /* time */ = {
-			isa = PBXGroup;
-			children = (
-				832BEED1278D4A32005E1BC4 /* rtime.h */,
-			);
-			path = time;
-			sourceTree = "<group>";
-		};
-		832BEED3278D4A32005E1BC4 /* audio */ = {
-			isa = PBXGroup;
-			children = (
-				832BEED4278D4A32005E1BC4 /* audio_resampler.h */,
-				832BEED5278D4A32005E1BC4 /* conversion */,
-			);
-			path = audio;
-			sourceTree = "<group>";
-		};
-		832BEED5278D4A32005E1BC4 /* conversion */ = {
-			isa = PBXGroup;
-			children = (
-				832BEED6278D4A32005E1BC4 /* s16_to_float.h */,
-				832BEED7278D4A32005E1BC4 /* s32_to_float.h */,
-			);
-			path = conversion;
-			sourceTree = "<group>";
-		};
-		832BEEDA278D4A32005E1BC4 /* string */ = {
-			isa = PBXGroup;
-			children = (
-				832BEEDB278D4A32005E1BC4 /* stdstring.h */,
-			);
-			path = string;
-			sourceTree = "<group>";
-		};
 		832BEF02278DD06D005E1BC4 /* Frameworks */ = {
 			isa = PBXGroup;
 			children = (
@@ -570,6 +423,288 @@
 			name = Frameworks;
 			sourceTree = "<group>";
 		};
+		8389F224278E64590074164C /* RetroArch */ = {
+			isa = PBXGroup;
+			children = (
+				8389F225278E64590074164C /* config.h */,
+				8389F226278E64590074164C /* libretro-common */,
+			);
+			name = RetroArch;
+			path = ../ThirdParty/RetroArch;
+			sourceTree = "<group>";
+		};
+		8389F226278E64590074164C /* libretro-common */ = {
+			isa = PBXGroup;
+			children = (
+				8389F227278E64590074164C /* encodings */,
+				8389F229278E64590074164C /* vfs */,
+				8389F22B278E64590074164C /* lists */,
+				8389F22D278E64590074164C /* file */,
+				8389F232278E64590074164C /* streams */,
+				8389F234278E64590074164C /* include */,
+				8389F260278E64590074164C /* features */,
+				8389F262278E64590074164C /* memmap */,
+				8389F264278E64590074164C /* time */,
+				8389F266278E64590074164C /* audio */,
+				8389F26E278E64590074164C /* string */,
+			);
+			path = "libretro-common";
+			sourceTree = "<group>";
+		};
+		8389F227278E64590074164C /* encodings */ = {
+			isa = PBXGroup;
+			children = (
+				8389F228278E64590074164C /* encoding_utf.c */,
+			);
+			path = encodings;
+			sourceTree = "<group>";
+		};
+		8389F229278E64590074164C /* vfs */ = {
+			isa = PBXGroup;
+			children = (
+				8389F22A278E64590074164C /* vfs_implementation.c */,
+			);
+			path = vfs;
+			sourceTree = "<group>";
+		};
+		8389F22B278E64590074164C /* lists */ = {
+			isa = PBXGroup;
+			children = (
+				8389F22C278E64590074164C /* string_list.c */,
+			);
+			path = lists;
+			sourceTree = "<group>";
+		};
+		8389F22D278E64590074164C /* file */ = {
+			isa = PBXGroup;
+			children = (
+				8389F22E278E64590074164C /* file_path_io.c */,
+				8389F22F278E64590074164C /* file_path.c */,
+				8389F230278E64590074164C /* config_file_userdata.c */,
+				8389F231278E64590074164C /* config_file.c */,
+			);
+			path = file;
+			sourceTree = "<group>";
+		};
+		8389F232278E64590074164C /* streams */ = {
+			isa = PBXGroup;
+			children = (
+				8389F233278E64590074164C /* file_stream.c */,
+			);
+			path = streams;
+			sourceTree = "<group>";
+		};
+		8389F234278E64590074164C /* include */ = {
+			isa = PBXGroup;
+			children = (
+				8389F235278E64590074164C /* encodings */,
+				8389F237278E64590074164C /* memalign.h */,
+				8389F238278E64590074164C /* vfs */,
+				8389F23B278E64590074164C /* compat */,
+				8389F241278E64590074164C /* retro_common_api.h */,
+				8389F242278E64590074164C /* retro_timers.h */,
+				8389F243278E64590074164C /* lists */,
+				8389F245278E64590074164C /* file */,
+				8389F249278E64590074164C /* retro_environment.h */,
+				8389F24A278E64590074164C /* array */,
+				8389F24C278E64590074164C /* retro_inline.h */,
+				8389F24D278E64590074164C /* retro_math.h */,
+				8389F24E278E64590074164C /* streams */,
+				8389F250278E64590074164C /* features */,
+				8389F252278E64590074164C /* retro_miscellaneous.h */,
+				8389F253278E64590074164C /* time */,
+				8389F255278E64590074164C /* boolean.h */,
+				8389F256278E64590074164C /* audio */,
+				8389F25B278E64590074164C /* libretro.h */,
+				8389F25C278E64590074164C /* retro_assert.h */,
+				8389F25D278E64590074164C /* string */,
+				8389F25F278E64590074164C /* filters.h */,
+			);
+			path = include;
+			sourceTree = "<group>";
+		};
+		8389F235278E64590074164C /* encodings */ = {
+			isa = PBXGroup;
+			children = (
+				8389F236278E64590074164C /* utf.h */,
+			);
+			path = encodings;
+			sourceTree = "<group>";
+		};
+		8389F238278E64590074164C /* vfs */ = {
+			isa = PBXGroup;
+			children = (
+				8389F239278E64590074164C /* vfs.h */,
+				8389F23A278E64590074164C /* vfs_implementation.h */,
+			);
+			path = vfs;
+			sourceTree = "<group>";
+		};
+		8389F23B278E64590074164C /* compat */ = {
+			isa = PBXGroup;
+			children = (
+				8389F23C278E64590074164C /* strl.h */,
+				8389F23D278E64590074164C /* strcasestr.h */,
+				8389F23E278E64590074164C /* fopen_utf8.h */,
+				8389F23F278E64590074164C /* posix_string.h */,
+				8389F240278E64590074164C /* msvc.h */,
+			);
+			path = compat;
+			sourceTree = "<group>";
+		};
+		8389F243278E64590074164C /* lists */ = {
+			isa = PBXGroup;
+			children = (
+				8389F244278E64590074164C /* string_list.h */,
+			);
+			path = lists;
+			sourceTree = "<group>";
+		};
+		8389F245278E64590074164C /* file */ = {
+			isa = PBXGroup;
+			children = (
+				8389F246278E64590074164C /* config_file.h */,
+				8389F247278E64590074164C /* config_file_userdata.h */,
+				8389F248278E64590074164C /* file_path.h */,
+			);
+			path = file;
+			sourceTree = "<group>";
+		};
+		8389F24A278E64590074164C /* array */ = {
+			isa = PBXGroup;
+			children = (
+				8389F24B278E64590074164C /* rhmap.h */,
+			);
+			path = array;
+			sourceTree = "<group>";
+		};
+		8389F24E278E64590074164C /* streams */ = {
+			isa = PBXGroup;
+			children = (
+				8389F24F278E64590074164C /* file_stream.h */,
+			);
+			path = streams;
+			sourceTree = "<group>";
+		};
+		8389F250278E64590074164C /* features */ = {
+			isa = PBXGroup;
+			children = (
+				8389F251278E64590074164C /* features_cpu.h */,
+			);
+			path = features;
+			sourceTree = "<group>";
+		};
+		8389F253278E64590074164C /* time */ = {
+			isa = PBXGroup;
+			children = (
+				8389F254278E64590074164C /* rtime.h */,
+			);
+			path = time;
+			sourceTree = "<group>";
+		};
+		8389F256278E64590074164C /* audio */ = {
+			isa = PBXGroup;
+			children = (
+				8389F257278E64590074164C /* audio_resampler.h */,
+				8389F258278E64590074164C /* conversion */,
+			);
+			path = audio;
+			sourceTree = "<group>";
+		};
+		8389F258278E64590074164C /* conversion */ = {
+			isa = PBXGroup;
+			children = (
+				8389F259278E64590074164C /* s16_to_float.h */,
+				8389F25A278E64590074164C /* s32_to_float.h */,
+			);
+			path = conversion;
+			sourceTree = "<group>";
+		};
+		8389F25D278E64590074164C /* string */ = {
+			isa = PBXGroup;
+			children = (
+				8389F25E278E64590074164C /* stdstring.h */,
+			);
+			path = string;
+			sourceTree = "<group>";
+		};
+		8389F260278E64590074164C /* features */ = {
+			isa = PBXGroup;
+			children = (
+				8389F261278E64590074164C /* features_cpu.c */,
+			);
+			path = features;
+			sourceTree = "<group>";
+		};
+		8389F262278E64590074164C /* memmap */ = {
+			isa = PBXGroup;
+			children = (
+				8389F263278E64590074164C /* memalign.c */,
+			);
+			path = memmap;
+			sourceTree = "<group>";
+		};
+		8389F264278E64590074164C /* time */ = {
+			isa = PBXGroup;
+			children = (
+				8389F265278E64590074164C /* rtime.c */,
+			);
+			path = time;
+			sourceTree = "<group>";
+		};
+		8389F266278E64590074164C /* audio */ = {
+			isa = PBXGroup;
+			children = (
+				8389F267278E64590074164C /* resampler */,
+				8389F26B278E64590074164C /* conversion */,
+			);
+			path = audio;
+			sourceTree = "<group>";
+		};
+		8389F267278E64590074164C /* resampler */ = {
+			isa = PBXGroup;
+			children = (
+				8389F268278E64590074164C /* drivers */,
+				8389F26A278E64590074164C /* audio_resampler.c */,
+			);
+			path = resampler;
+			sourceTree = "<group>";
+		};
+		8389F268278E64590074164C /* drivers */ = {
+			isa = PBXGroup;
+			children = (
+				8389F269278E64590074164C /* sinc_resampler.c */,
+			);
+			path = drivers;
+			sourceTree = "<group>";
+		};
+		8389F26B278E64590074164C /* conversion */ = {
+			isa = PBXGroup;
+			children = (
+				8389F26C278E64590074164C /* s16_to_float.c */,
+				8389F26D278E64590074164C /* s32_to_float.c */,
+			);
+			path = conversion;
+			sourceTree = "<group>";
+		};
+		8389F26E278E64590074164C /* string */ = {
+			isa = PBXGroup;
+			children = (
+				8389F26F278E64590074164C /* stdstring.c */,
+			);
+			path = string;
+			sourceTree = "<group>";
+		};
+		8389F2A0278E646E0074164C /* Vorbis */ = {
+			isa = PBXGroup;
+			children = (
+				8389F2A1278E646E0074164C /* lpc.h */,
+				8389F2A2278E646E0074164C /* lpc.c */,
+			);
+			name = Vorbis;
+			path = ../ThirdParty/Vorbis;
+			sourceTree = "<group>";
+		};
 /* End PBXGroup section */
 
 /* Begin PBXHeadersBuildPhase section */
@@ -578,57 +713,58 @@
 			buildActionMask = 2147483647;
 			files = (
 				17D21CA10B8BE4BA00D1EBDE /* BufferChain.h in Headers */,
-				832BEEE0278D4A32005E1BC4 /* vfs_implementation.h in Headers */,
+				8389F27C278E64590074164C /* vfs_implementation.h in Headers */,
 				17D21CA50B8BE4BA00D1EBDE /* InputNode.h in Headers */,
-				832BEEF5278D4A32005E1BC4 /* audio_resampler.h in Headers */,
-				832BEEDF278D4A32005E1BC4 /* vfs.h in Headers */,
-				832BEEF7278D4A32005E1BC4 /* s32_to_float.h in Headers */,
+				8389F291278E64590074164C /* audio_resampler.h in Headers */,
+				8389F27B278E64590074164C /* vfs.h in Headers */,
+				8389F293278E64590074164C /* s32_to_float.h in Headers */,
 				17D21CA70B8BE4BA00D1EBDE /* Node.h in Headers */,
-				832BEEE7278D4A32005E1BC4 /* retro_timers.h in Headers */,
+				8389F283278E64590074164C /* retro_timers.h in Headers */,
 				17D21CA90B8BE4BA00D1EBDE /* OutputNode.h in Headers */,
-				832BEEFA278D4A32005E1BC4 /* stdstring.h in Headers */,
-				832BEEE3278D4A32005E1BC4 /* fopen_utf8.h in Headers */,
-				832BEEE2278D4A32005E1BC4 /* strcasestr.h in Headers */,
-				832BEEEB278D4A32005E1BC4 /* file_path.h in Headers */,
-				832BEEA2278D464B005E1BC4 /* config.h in Headers */,
+				8389F296278E64590074164C /* stdstring.h in Headers */,
+				8389F27F278E64590074164C /* fopen_utf8.h in Headers */,
+				8389F27E278E64590074164C /* strcasestr.h in Headers */,
+				8389F287278E64590074164C /* file_path.h in Headers */,
+				8389F270278E64590074164C /* config.h in Headers */,
 				17D21CC50B8BE4BA00D1EBDE /* OutputCoreAudio.h in Headers */,
 				17D21CC70B8BE4BA00D1EBDE /* Status.h in Headers */,
-				832BEEF2278D4A32005E1BC4 /* retro_miscellaneous.h in Headers */,
-				832BEEE4278D4A32005E1BC4 /* posix_string.h in Headers */,
-				832BEEF1278D4A32005E1BC4 /* features_cpu.h in Headers */,
+				8389F28E278E64590074164C /* retro_miscellaneous.h in Headers */,
+				8389F280278E64590074164C /* posix_string.h in Headers */,
+				8389F28D278E64590074164C /* features_cpu.h in Headers */,
 				17D21CDF0B8BE5B400D1EBDE /* VirtualRingBuffer.h in Headers */,
-				832BEEE6278D4A32005E1BC4 /* retro_common_api.h in Headers */,
-				832BEEF3278D4A32005E1BC4 /* rtime.h in Headers */,
+				8389F282278E64590074164C /* retro_common_api.h in Headers */,
+				8389F28F278E64590074164C /* rtime.h in Headers */,
 				17D21CF30B8BE5EF00D1EBDE /* Semaphore.h in Headers */,
-				832BEEE9278D4A32005E1BC4 /* config_file.h in Headers */,
+				8389F285278E64590074164C /* config_file.h in Headers */,
 				17D21DC70B8BE79700D1EBDE /* CoreAudioUtils.h in Headers */,
-				832BEEE8278D4A32005E1BC4 /* string_list.h in Headers */,
-				832BEEDE278D4A32005E1BC4 /* memalign.h in Headers */,
+				8389F284278E64590074164C /* string_list.h in Headers */,
+				8389F27A278E64590074164C /* memalign.h in Headers */,
 				17D21EBD0B8BF44000D1EBDE /* AudioPlayer.h in Headers */,
 				17F94DD50B8D0F7000A34E87 /* PluginController.h in Headers */,
 				17F94DDD0B8D101100A34E87 /* Plugin.h in Headers */,
 				17A2D3C50B8D1D37000778C4 /* AudioDecoder.h in Headers */,
-				832BEEE1278D4A32005E1BC4 /* strl.h in Headers */,
-				832BEEE5278D4A32005E1BC4 /* msvc.h in Headers */,
-				832BEEF4278D4A32005E1BC4 /* boolean.h in Headers */,
-				832BEEF9278D4A32005E1BC4 /* retro_assert.h in Headers */,
-				832BEEEE278D4A32005E1BC4 /* retro_inline.h in Headers */,
+				8389F27D278E64590074164C /* strl.h in Headers */,
+				8389F281278E64590074164C /* msvc.h in Headers */,
+				8389F2A3278E646E0074164C /* lpc.h in Headers */,
+				8389F290278E64590074164C /* boolean.h in Headers */,
+				8389F295278E64590074164C /* retro_assert.h in Headers */,
+				8389F28A278E64590074164C /* retro_inline.h in Headers */,
 				17C940230B900909008627D6 /* AudioMetadataReader.h in Headers */,
-				832BEEF8278D4A32005E1BC4 /* libretro.h in Headers */,
+				8389F294278E64590074164C /* libretro.h in Headers */,
 				17B619300B909BC300BC003F /* AudioPropertiesReader.h in Headers */,
-				832BEEEA278D4A32005E1BC4 /* config_file_userdata.h in Headers */,
+				8389F286278E64590074164C /* config_file_userdata.h in Headers */,
 				839366671815923C006DD712 /* CogPluginMulti.h in Headers */,
 				17ADB13C0B97926D00257CA2 /* AudioSource.h in Headers */,
-				832BEEF6278D4A32005E1BC4 /* s16_to_float.h in Headers */,
-				832BEEDD278D4A32005E1BC4 /* utf.h in Headers */,
-				832BEEEC278D4A32005E1BC4 /* retro_environment.h in Headers */,
+				8389F292278E64590074164C /* s16_to_float.h in Headers */,
+				8389F279278E64590074164C /* utf.h in Headers */,
+				8389F288278E64590074164C /* retro_environment.h in Headers */,
 				8EC1225F0B993BD500C5B3AD /* ConverterNode.h in Headers */,
-				832BEEF0278D4A32005E1BC4 /* file_stream.h in Headers */,
+				8389F28C278E64590074164C /* file_stream.h in Headers */,
 				8384912718080FF100E7332D /* Logging.h in Headers */,
-				832BEEFB278D4A32005E1BC4 /* filters.h in Headers */,
+				8389F297278E64590074164C /* filters.h in Headers */,
 				8E8D3D2F0CBAEE6E00135C1B /* AudioContainer.h in Headers */,
-				832BEEED278D4A32005E1BC4 /* rhmap.h in Headers */,
-				832BEEEF278D4A32005E1BC4 /* retro_math.h in Headers */,
+				8389F289278E64590074164C /* rhmap.h in Headers */,
+				8389F28B278E64590074164C /* retro_math.h in Headers */,
 				B0575F2D0D687A0800411D77 /* Helper.h in Headers */,
 				07DB5F3E0ED353A900C2E3EF /* AudioMetadataWriter.h in Headers */,
 			);
@@ -704,41 +840,42 @@
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				8389F275278E64590074164C /* file_path.c in Sources */,
 				17D21CA20B8BE4BA00D1EBDE /* BufferChain.m in Sources */,
 				17D21CA60B8BE4BA00D1EBDE /* InputNode.m in Sources */,
-				832BEEAA278D47FB005E1BC4 /* file_path_io.c in Sources */,
 				17D21CA80B8BE4BA00D1EBDE /* Node.m in Sources */,
 				17D21CAA0B8BE4BA00D1EBDE /* OutputNode.m in Sources */,
-				832BEEB0278D48C1005E1BC4 /* s32_to_float.c in Sources */,
+				8389F298278E64590074164C /* features_cpu.c in Sources */,
+				8389F29E278E64590074164C /* s32_to_float.c in Sources */,
 				17D21CC60B8BE4BA00D1EBDE /* OutputCoreAudio.m in Sources */,
-				832BEEA8278D47F0005E1BC4 /* stdstring.c in Sources */,
-				832BEEA0278D460F005E1BC4 /* file_stream.c in Sources */,
 				17D21CE00B8BE5B400D1EBDE /* VirtualRingBuffer.m in Sources */,
+				8389F29D278E64590074164C /* s16_to_float.c in Sources */,
+				8389F277278E64590074164C /* config_file.c in Sources */,
+				8389F276278E64590074164C /* config_file_userdata.c in Sources */,
+				8389F29B278E64590074164C /* sinc_resampler.c in Sources */,
+				8389F273278E64590074164C /* string_list.c in Sources */,
+				8389F299278E64590074164C /* memalign.c in Sources */,
+				8389F278278E64590074164C /* file_stream.c in Sources */,
+				8389F272278E64590074164C /* vfs_implementation.c in Sources */,
 				17D21CF40B8BE5EF00D1EBDE /* Semaphore.m in Sources */,
-				832BEE9C278D451D005E1BC4 /* config_file.c in Sources */,
-				832BEEA6278D4755005E1BC4 /* vfs_implementation.c in Sources */,
+				8389F29A278E64590074164C /* rtime.c in Sources */,
 				17D21DC80B8BE79700D1EBDE /* CoreAudioUtils.m in Sources */,
 				839366681815923C006DD712 /* CogPluginMulti.m in Sources */,
-				832BEE90278D40F7005E1BC4 /* features_cpu.c in Sources */,
-				832BEE9E278D452C005E1BC4 /* string_list.c in Sources */,
-				832BEEAC278D4848005E1BC4 /* encoding_utf.c in Sources */,
-				832BEE9A278D4473005E1BC4 /* memalign.c in Sources */,
 				17D21EBE0B8BF44000D1EBDE /* AudioPlayer.m in Sources */,
+				8389F274278E64590074164C /* file_path_io.c in Sources */,
 				17F94DD60B8D0F7000A34E87 /* PluginController.m in Sources */,
-				832BEEA4278D469D005E1BC4 /* file_path.c in Sources */,
 				17A2D3C60B8D1D37000778C4 /* AudioDecoder.m in Sources */,
 				17C940240B900909008627D6 /* AudioMetadataReader.m in Sources */,
 				17B619310B909BC300BC003F /* AudioPropertiesReader.m in Sources */,
+				8389F29F278E64590074164C /* stdstring.c in Sources */,
 				17ADB13D0B97926D00257CA2 /* AudioSource.m in Sources */,
 				8EC122600B993BD500C5B3AD /* ConverterNode.m in Sources */,
+				8389F271278E64590074164C /* encoding_utf.c in Sources */,
 				8E8D3D300CBAEE6E00135C1B /* AudioContainer.m in Sources */,
-				832BEEAE278D4853005E1BC4 /* rtime.c in Sources */,
-				832BEE96278D414A005E1BC4 /* sinc_resampler.c in Sources */,
 				B0575F300D687A4000411D77 /* Helper.m in Sources */,
-				832BEE98278D4462005E1BC4 /* config_file_userdata.c in Sources */,
+				8389F2A4278E646E0074164C /* lpc.c in Sources */,
+				8389F29C278E64590074164C /* audio_resampler.c in Sources */,
 				07DB5F3F0ED353A900C2E3EF /* AudioMetadataWriter.m in Sources */,
-				832BEE94278D412D005E1BC4 /* audio_resampler.c in Sources */,
-				832BEE92278D4109005E1BC4 /* s16_to_float.c in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
diff --git a/ThirdParty/Vorbis/lpc.c b/ThirdParty/Vorbis/lpc.c
new file mode 100644
index 000000000..932319875
--- /dev/null
+++ b/ThirdParty/Vorbis/lpc.c
@@ -0,0 +1,156 @@
+/********************************************************************
+ *                                                                  *
+ * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *
+ * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
+ * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
+ * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
+ *                                                                  *
+ * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2009             *
+ * by the Xiph.Org Foundation http://www.xiph.org/                  *
+ *                                                                  *
+ ********************************************************************
+
+  function: LPC low level routines
+  last mod: $Id: lpc.c 16227 2009-07-08 06:58:46Z xiphmont $
+
+ ********************************************************************/
+
+/* Some of these routines (autocorrelator, LPC coefficient estimator)
+   are derived from code written by Jutta Degener and Carsten Bormann;
+   thus we include their copyright below.  The entirety of this file
+   is freely redistributable on the condition that both of these
+   copyright notices are preserved without modification.  */
+
+/* Preserved Copyright: *********************************************/
+
+/* Copyright 1992, 1993, 1994 by Jutta Degener and Carsten Bormann,
+Technische Universita"t Berlin
+
+Any use of this software is permitted provided that this notice is not
+removed and that neither the authors nor the Technische Universita"t
+Berlin are deemed to have made any representations as to the
+suitability of this software for any purpose nor are held responsible
+for any defects of this software. THERE IS ABSOLUTELY NO WARRANTY FOR
+THIS SOFTWARE.
+
+As a matter of courtesy, the authors request to be informed about uses
+this software has found, about bugs in this software, and about any
+improvements that may be of general interest.
+
+Berlin, 28.11.1994
+Jutta Degener
+Carsten Bormann
+
+*********************************************************************/
+
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+#include "lpc.h"
+
+/* Autocorrelation LPC coeff generation algorithm invented by
+   N. Levinson in 1947, modified by J. Durbin in 1959. */
+
+/* Input : n elements of time doamin data
+   Output: m lpc coefficients, excitation energy */
+
+float vorbis_lpc_from_data(float *data,float *lpci,int n,int m){
+  double aut[m+1];
+  double lpc[m];
+  double error;
+  double epsilon;
+  int i,j;
+
+  /* autocorrelation, p+1 lag coefficients */
+  j=m+1;
+  while(j--){
+    double d=0; /* double needed for accumulator depth */
+    for(i=j;i<n;i++)d+=(double)data[i]*data[i-j];
+    aut[j]=d;
+  }
+
+  /* Generate lpc coefficients from autocorr values */
+
+  /* set our noise floor to about -100dB */
+  error=aut[0] * (1. + 1e-10);
+  epsilon=1e-9*aut[0]+1e-10;
+
+  for(i=0;i<m;i++){
+    double r= -aut[i+1];
+
+    if(error<epsilon){
+      memset(lpc+i,0,(m-i)*sizeof(*lpc));
+      goto done;
+    }
+
+    /* Sum up this iteration's reflection coefficient; note that in
+       Vorbis we don't save it.  If anyone wants to recycle this code
+       and needs reflection coefficients, save the results of 'r' from
+       each iteration. */
+
+    for(j=0;j<i;j++)r-=lpc[j]*aut[i-j];
+    r/=error;
+
+    /* Update LPC coefficients and total error */
+
+    lpc[i]=r;
+    for(j=0;j<i/2;j++){
+      double tmp=lpc[j];
+
+      lpc[j]+=r*lpc[i-1-j];
+      lpc[i-1-j]+=r*tmp;
+    }
+    if(i&1)lpc[j]+=lpc[j]*r;
+
+    error*=1.-r*r;
+
+  }
+
+ done:
+
+  /* slightly damp the filter */
+  {
+    double g = .99;
+    double damp = g;
+    for(j=0;j<m;j++){
+      lpc[j]*=damp;
+      damp*=g;
+    }
+  }
+
+  for(j=0;j<m;j++)lpci[j]=(float)lpc[j];
+
+  /* we need the error value to know how big an impulse to hit the
+     filter with later */
+
+  return error;
+}
+
+void vorbis_lpc_predict(float *coeff,float *prime,int m,
+                     float *data,long n){
+
+  /* in: coeff[0...m-1] LPC coefficients
+         prime[0...m-1] initial values (allocated size of n+m-1)
+    out: data[0...n-1] data samples */
+
+  long i,j,o,p;
+  float y;
+  float work[m+n];
+
+  if(!prime)
+    for(i=0;i<m;i++)
+      work[i]=0.f;
+  else
+    for(i=0;i<m;i++)
+      work[i]=prime[i];
+
+  for(i=0;i<n;i++){
+    y=0;
+    o=i;
+    p=m;
+    for(j=0;j<m;j++)
+      y-=work[o++]*coeff[--p];
+
+    data[i]=work[o]=y;
+  }
+}
diff --git a/ThirdParty/Vorbis/lpc.h b/ThirdParty/Vorbis/lpc.h
new file mode 100644
index 000000000..c90f867e4
--- /dev/null
+++ b/ThirdParty/Vorbis/lpc.h
@@ -0,0 +1,27 @@
+/********************************************************************
+ *                                                                  *
+ * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *
+ * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
+ * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
+ * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
+ *                                                                  *
+ * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2007             *
+ * by the Xiph.Org Foundation http://www.xiph.org/                  *
+ *                                                                  *
+ ********************************************************************
+
+  function: LPC low level routines
+  last mod: $Id: lpc.h 16037 2009-05-26 21:10:58Z xiphmont $
+
+ ********************************************************************/
+
+#ifndef _V_LPC_H_
+#define _V_LPC_H_
+
+/* simple linear scale LPC code */
+extern float vorbis_lpc_from_data(float *data,float *lpc,int n,int m);
+
+extern void vorbis_lpc_predict(float *coeff,float *prime,int m,
+                               float *data,long n);
+
+#endif