From 5315ce20f8730c13c3b79f98d90caf8ce74f9cae Mon Sep 17 00:00:00 2001
From: tobigun <tobigun@b956fd51-792f-4845-bead-9b4dfca2ff2c>
Date: Wed, 27 Oct 2010 20:09:47 +0000
Subject: ffmpeg audio converter moved to media plugin

git-svn-id: svn://svn.code.sf.net/p/ultrastardx/svn/branches/experimental@2690 b956fd51-792f-4845-bead-9b4dfca2ff2c
---
 mediaplugin/src/media/UAudioConverter.pas      |  82 ++-----
 mediaplugin/src/media/UAudioDecoder_FFmpeg.pas |  15 --
 mediaplugin/src/media/UMediaCore_FFmpeg.pas    | 302 -------------------------
 mediaplugin/src/media/UMediaPlugin.pas         |  40 +++-
 4 files changed, 57 insertions(+), 382 deletions(-)

diff --git a/mediaplugin/src/media/UAudioConverter.pas b/mediaplugin/src/media/UAudioConverter.pas
index 657b80dd..aa3e343e 100644
--- a/mediaplugin/src/media/UAudioConverter.pas
+++ b/mediaplugin/src/media/UAudioConverter.pas
@@ -40,9 +40,7 @@ uses
   {$IFDEF UseSRCResample}
   samplerate,
   {$ENDIF}
-  {$IFDEF UseFFmpegResample}
-  avcodec,
-  {$ENDIF}
+  UMediaPlugin,
   UMediaCore_SDL,
   sdl,
   SysUtils,
@@ -76,13 +74,11 @@ type
   end;
 
   {$IFDEF UseFFmpegResample}
-  // Note: FFmpeg seems to be using "kaiser windowed sinc" for resampling, so
-  // the quality should be good.
   TAudioConverter_FFmpeg = class(TAudioConverter)
     private
-      // TODO: use SDL for multi-channel->stereo and format conversion
-      ResampleContext: PReSampleContext;
-      Ratio: double;
+      fPluginInfo: PMediaPluginInfo;
+      fAudioConverter: PAudioConverterInfo;
+      fStream: PAudioConvertStream;
     public
       function Init(SrcFormatInfo: TAudioFormatInfo; DstFormatInfo: TAudioFormatInfo): boolean; override;
       destructor Destroy(); override;
@@ -199,84 +195,50 @@ end;
 {$IFDEF UseFFmpegResample}
 
 function TAudioConverter_FFmpeg.Init(SrcFormatInfo: TAudioFormatInfo; DstFormatInfo: TAudioFormatInfo): boolean;
+var
+  CSrcFormatInfo: TCAudioFormatInfo;
+  CDstFormatInfo: TCAudioFormatInfo;
 begin
   inherited Init(SrcFormatInfo, DstFormatInfo);
 
   Result := false;
-
-  // Note: ffmpeg does not support resampling for more than 2 input channels
-
-  if (srcFormatInfo.Format <> asfS16) then
-  begin
-    Log.LogError('Unsupported format', 'TAudioConverter_FFmpeg.Init');
-    Exit;
-  end;
-
-  // TODO: use SDL here
-  if (srcFormatInfo.Format <> dstFormatInfo.Format) then
+  fPluginInfo := Plugin_register(MediaPluginCore);
+  fPluginInfo.initialize();
+  fAudioConverter := fPluginInfo.audioConverter;
+
+  AudioFormatInfoToCStruct(SrcFormatInfo, CSrcFormatInfo);
+  AudioFormatInfoToCStruct(DstFormatInfo, CDstFormatInfo);
+  fStream := fAudioConverter.open(@CSrcFormatInfo, @CDstFormatInfo);
+  if (fStream = nil) then
   begin
-    Log.LogError('Incompatible formats', 'TAudioConverter_FFmpeg.Init');
+    Log.LogError('fAudioConverter.open() failed', 'TAudioConverter_FFmpeg.Init');
     Exit;
   end;
 
-  ResampleContext := audio_resample_init(
-      dstFormatInfo.Channels, srcFormatInfo.Channels,
-      Round(dstFormatInfo.SampleRate), Round(srcFormatInfo.SampleRate));
-  if (ResampleContext = nil) then
-  begin
-    Log.LogError('audio_resample_init() failed', 'TAudioConverter_FFmpeg.Init');
-    Exit;
-  end;
-
-  // calculate ratio
-  Ratio := (dstFormatInfo.Channels / srcFormatInfo.Channels) *
-           (dstFormatInfo.SampleRate / srcFormatInfo.SampleRate);
-
   Result := true;
 end;
 
 destructor TAudioConverter_FFmpeg.Destroy();
 begin
-  if (ResampleContext <> nil) then
-    audio_resample_close(ResampleContext);
+  if (fStream <> nil) then
+    fAudioConverter.close(fStream);
   inherited;
 end;
 
 function TAudioConverter_FFmpeg.Convert(InputBuffer: PByteArray; OutputBuffer: PByteArray; var InputSize: integer): integer;
-var
-  InputSampleCount: integer;
-  OutputSampleCount: integer;
 begin
-  Result := -1;
-
-  if (InputSize <= 0) then
-  begin
-    // avoid div-by-zero in audio_resample()
-    if (InputSize = 0) then
-      Result := 0;
-    Exit;
-  end;
-
-  InputSampleCount := InputSize div SrcFormatInfo.FrameSize;
-  OutputSampleCount := audio_resample(
-      ResampleContext, PSmallInt(OutputBuffer), PSmallInt(InputBuffer),
-      InputSampleCount);
-  if (OutputSampleCount = -1) then
-  begin
-    Log.LogError('audio_resample() failed', 'TAudioConverter_FFmpeg.Convert');
-    Exit;
-  end;
-  Result := OutputSampleCount * DstFormatInfo.FrameSize;
+  Result := fAudioConverter.convert(fStream,
+      PCuint8(InputBuffer), PCuint8(OutputBuffer), @InputSize);
 end;
 
 function TAudioConverter_FFmpeg.GetOutputBufferSize(InputSize: integer): integer;
 begin
-  Result := Ceil(InputSize * GetRatio());
+  Result := fAudioConverter.getOutputBufferSize(fStream, InputSize);
 end;
 
 function TAudioConverter_FFmpeg.GetRatio(): double;
 begin
-  Result := Ratio;
+  Result := fAudioConverter.getRatio(fStream);
 end;
 
 {$ENDIF}
diff --git a/mediaplugin/src/media/UAudioDecoder_FFmpeg.pas b/mediaplugin/src/media/UAudioDecoder_FFmpeg.pas
index 3031b46a..bef162bd 100644
--- a/mediaplugin/src/media/UAudioDecoder_FFmpeg.pas
+++ b/mediaplugin/src/media/UAudioDecoder_FFmpeg.pas
@@ -199,21 +199,6 @@ end;
 
 { TAudioDecoder_FFmpeg }
 
-const
-{$IFDEF MSWINDOWS}
-  ffmpegPlugin = 'ffmpeg_playback.dll';
-{$ENDIF}
-{$IFDEF LINUX}
-  ffmpegPlugin = 'ffmpeg_playback';
-{$ENDIF}
-{$IFDEF DARWIN}
-  ffmpegPlugin = 'ffmpeg_playback.dylib';
-  {$linklib ffmpegPlugin}
-{$ENDIF}
-
-function Plugin_register(core: PMediaPluginCore): PMediaPluginInfo;
-  cdecl; external ffmpegPlugin;
-
 constructor TAudioDecoder_FFmpeg.Create();
 begin
   inherited Create();
diff --git a/mediaplugin/src/media/UMediaCore_FFmpeg.pas b/mediaplugin/src/media/UMediaCore_FFmpeg.pas
index eb136995..2f589442 100644
--- a/mediaplugin/src/media/UMediaCore_FFmpeg.pas
+++ b/mediaplugin/src/media/UMediaCore_FFmpeg.pas
@@ -46,32 +46,6 @@ uses
   ULog,
   UPath;
 
-type
-  PPacketQueue = ^TPacketQueue;
-  TPacketQueue = class
-    private
-      FirstListEntry: PAVPacketList;
-      LastListEntry:  PAVPacketList;
-      PacketCount: integer;
-      Mutex:     PSDL_Mutex;
-      Condition: PSDL_Cond;
-      Size: integer;
-      AbortRequest: boolean;
-    public
-      constructor Create();
-      destructor Destroy(); override;
-
-      function Put(Packet : PAVPacket): integer;
-      function PutStatus(StatusFlag: integer; StatusInfo: Pointer): integer;
-      procedure FreeStatusInfo(var Packet: TAVPacket);
-      function GetStatusInfo(var Packet: TAVPacket): Pointer;
-      function Get(var Packet: TAVPacket; Blocking: boolean): integer;
-      function GetSize(): integer;
-      procedure Flush();
-      procedure Abort();
-      function IsAborted(): boolean;
-  end;
-
 const
   STATUS_PACKET: PChar = 'STATUS_PACKET';
 const
@@ -122,76 +96,8 @@ const
 var
   Instance: TMediaCore_FFmpeg;
 
-function AV_VERSION_INT(a, b, c: cardinal): cuint;
-begin
-  Result := (a shl 16) or (b shl 8) or c;
-end;
-
 procedure CheckVersions();
-var
-  libVersion: cuint;
-  headerVersion: cuint;
-
-  function hexVerToStr(Version: cuint): string;
-  var
-    Major, Minor, Release: cardinal;
-  begin
-    Major   := (Version shr 16) and $FF;;
-    Minor   := (Version shr 8) and $FF;
-    Release := Version and $FF;
-    Result := Format('%d.%d.%d', [Major, Minor, Release]);
-  end;
-
 begin
-  libVersion := avcodec_version();
-  headerVersion := AV_VERSION_INT(
-      LIBAVCODEC_VERSION_MAJOR,
-      LIBAVCODEC_VERSION_MINOR,
-      LIBAVCODEC_VERSION_RELEASE);
-  if (libVersion <> headerVersion) then
-  begin
-    Log.LogError(Format('%s header (%s) and DLL (%s) versions do not match.',
-        ['libavcodec', hexVerToStr(headerVersion), hexVerToStr(libVersion)]));
-  end;
-
-  {$IF LIBAVFORMAT_VERSION >= 52020000} // 52.20.0
-  libVersion := avformat_version();
-  headerVersion := AV_VERSION_INT(
-      LIBAVFORMAT_VERSION_MAJOR,
-      LIBAVFORMAT_VERSION_MINOR,
-      LIBAVFORMAT_VERSION_RELEASE);
-  if (libVersion <> headerVersion) then
-  begin
-    Log.LogError(Format('%s header (%s) and DLL (%s) versions do not match.',
-        ['libavformat', hexVerToStr(headerVersion), hexVerToStr(libVersion)]));
-  end;
-  {$IFEND}
-
-  {$IF LIBAVUTIL_VERSION >= 49008000} // 49.8.0
-  libVersion := avutil_version();
-  headerVersion := AV_VERSION_INT(
-      LIBAVUTIL_VERSION_MAJOR,
-      LIBAVUTIL_VERSION_MINOR,
-      LIBAVUTIL_VERSION_RELEASE);
-  if (libVersion <> headerVersion) then
-  begin
-    Log.LogError(Format('%s header (%s) and DLL (%s) versions do not match.',
-        ['libavutil', hexVerToStr(headerVersion), hexVerToStr(libVersion)]));
-  end;
-  {$IFEND}
-  
-  {$IF LIBSWSCALE_VERSION >= 000006001} // 0.6.1
-  libVersion := swscale_version();
-  headerVersion := AV_VERSION_INT(
-      LIBSWSCALE_VERSION_MAJOR,
-      LIBSWSCALE_VERSION_MINOR,
-      LIBSWSCALE_VERSION_RELEASE);
-  if (libVersion <> headerVersion) then
-  begin
-    Log.LogError(Format('%s header (%s) and DLL (%s) versions do not match.',
-        ['libswscale', hexVerToStr(headerVersion), hexVerToStr(libVersion)]));
-  end;
-  {$IFEND}
 end;
 
 constructor TMediaCore_FFmpeg.Create();
@@ -434,212 +340,4 @@ begin
   Result := 0;
 end;
 
-
-{ TPacketQueue }
-
-constructor TPacketQueue.Create();
-begin
-  inherited;
-
-  FirstListEntry := nil;
-  LastListEntry  := nil;
-  PacketCount := 0;
-  Size := 0;
-
-  Mutex := SDL_CreateMutex();
-  Condition := SDL_CreateCond();
-end;
-
-destructor TPacketQueue.Destroy();
-begin
-  Flush();
-  SDL_DestroyMutex(Mutex);
-  SDL_DestroyCond(Condition);
-  inherited;
-end;
-
-procedure TPacketQueue.Abort();
-begin
-  SDL_LockMutex(Mutex);
-
-  AbortRequest := true;
-
-  SDL_CondBroadcast(Condition);
-  SDL_UnlockMutex(Mutex);
-end;
-
-function TPacketQueue.IsAborted(): boolean;
-begin
-  SDL_LockMutex(Mutex);
-  Result := AbortRequest;
-  SDL_UnlockMutex(Mutex);
-end;
-
-function TPacketQueue.Put(Packet : PAVPacket): integer;
-var
-  CurrentListEntry : PAVPacketList;
-begin
-  Result := -1;
-
-  if (Packet = nil) then
-    Exit;
-
-  if (PChar(Packet^.data) <> STATUS_PACKET) then
-  begin
-    if (av_dup_packet(Packet) < 0) then
-      Exit;
-  end;
-
-  CurrentListEntry := av_malloc(SizeOf(TAVPacketList));
-  if (CurrentListEntry = nil) then
-    Exit;
-
-  CurrentListEntry^.pkt  := Packet^;
-  CurrentListEntry^.next := nil;
-
-  SDL_LockMutex(Mutex);
-  try
-    if (LastListEntry = nil) then
-      FirstListEntry := CurrentListEntry
-    else
-      LastListEntry^.next := CurrentListEntry;
-
-    LastListEntry := CurrentListEntry;
-    Inc(PacketCount);
-
-    Size := Size + CurrentListEntry^.pkt.size;
-    SDL_CondSignal(Condition);
-  finally
-    SDL_UnlockMutex(Mutex);
-  end;
-
-  Result := 0;
-end;
-
-(**
- * Adds a status packet (EOF, Flush, etc.) to the end of the queue.
- * StatusInfo can be used to pass additional information to the decoder.
- * Only assign nil or a valid pointer to data allocated with Getmem() to
- * StatusInfo because the pointer will be disposed with Freemem() on a call
- * to Flush(). If the packet is removed from the queue it is the decoder's
- * responsibility to free the StatusInfo data with FreeStatusInfo().
- *)
-function TPacketQueue.PutStatus(StatusFlag: integer; StatusInfo: Pointer): integer;
-var
-  TempPacket: PAVPacket;
-begin
-  // create temp. package
-  TempPacket := av_malloc(SizeOf(TAVPacket));
-  if (TempPacket = nil) then
-  begin
-    Result := -1;
-    Exit;
-  end;
-  // init package
-  av_init_packet(TempPacket^);
-  TempPacket^.data  := Pointer(STATUS_PACKET);
-  TempPacket^.flags := StatusFlag;
-  TempPacket^.priv  := StatusInfo;
-  // put a copy of the package into the queue
-  Result := Put(TempPacket);
-  // data has been copied -> delete temp. package
-  av_free(TempPacket);
-end;
-
-procedure TPacketQueue.FreeStatusInfo(var Packet: TAVPacket);
-begin
-  if (Packet.priv <> nil) then
-    FreeMem(Packet.priv);
-end;
-
-function TPacketQueue.GetStatusInfo(var Packet: TAVPacket): Pointer;
-begin
-  Result := Packet.priv;
-end;
-
-function TPacketQueue.Get(var Packet: TAVPacket; Blocking: boolean): integer;
-var
-  CurrentListEntry: PAVPacketList;
-const
-  WAIT_TIMEOUT = 10; // timeout in ms
-begin
-  Result := -1;
-
-  SDL_LockMutex(Mutex);
-  try
-    while (true) do
-    begin
-      if (AbortRequest) then
-        Exit;
-
-      CurrentListEntry := FirstListEntry;
-      if (CurrentListEntry <> nil) then
-      begin
-        FirstListEntry := CurrentListEntry^.next;
-        if (FirstListEntry = nil) then
-          LastListEntry := nil;
-        Dec(PacketCount);
-
-        Size := Size - CurrentListEntry^.pkt.size;
-        Packet := CurrentListEntry^.pkt;
-        av_free(CurrentListEntry);
-
-        Result := 1;
-        Break;
-      end
-      else if (not Blocking) then
-      begin
-        Result := 0;
-        Break;
-      end
-      else
-      begin
-        // block until a new package arrives,
-        // but do not wait till infinity to avoid deadlocks
-        if (SDL_CondWaitTimeout(Condition, Mutex, WAIT_TIMEOUT) = SDL_MUTEX_TIMEDOUT) then
-        begin
-          Result := 0;
-          Break;
-        end;
-      end;
-    end;
-  finally
-    SDL_UnlockMutex(Mutex);
-  end;
-end;
-
-function TPacketQueue.GetSize(): integer;
-begin
-  SDL_LockMutex(Mutex);
-  Result := Size;
-  SDL_UnlockMutex(Mutex);
-end;
-
-procedure TPacketQueue.Flush();
-var
-  CurrentListEntry, TempListEntry: PAVPacketList;
-begin
-  SDL_LockMutex(Mutex);
-
-  CurrentListEntry := FirstListEntry;
-  while(CurrentListEntry <> nil) do
-  begin
-    TempListEntry := CurrentListEntry^.next;
-    // free status data
-    if (PChar(CurrentListEntry^.pkt.data) = STATUS_PACKET) then
-      FreeStatusInfo(CurrentListEntry^.pkt);
-    // free packet data
-    av_free_packet(@CurrentListEntry^.pkt);
-    // Note: param must be a pointer to a pointer!
-    av_freep(@CurrentListEntry);
-    CurrentListEntry := TempListEntry;
-  end;
-  LastListEntry := nil;
-  FirstListEntry := nil;
-  PacketCount := 0;
-  Size := 0;
-
-  SDL_UnlockMutex(Mutex);
-end;
-
 end.
diff --git a/mediaplugin/src/media/UMediaPlugin.pas b/mediaplugin/src/media/UMediaPlugin.pas
index 8e2708bf..c676619c 100644
--- a/mediaplugin/src/media/UMediaPlugin.pas
+++ b/mediaplugin/src/media/UMediaPlugin.pas
@@ -36,6 +36,7 @@ interface
 {$ENDIF}
 
 uses
+  UMusic,
   ctypes;
 
 type
@@ -78,7 +79,7 @@ type
   end;
 
   PAudioDecodeStream = Pointer;
-  PAudioResampleStream = Pointer;
+  PAudioConvertStream = Pointer;
 
   PCAudioFormatInfo = ^TCAudioFormatInfo;
   TCAudioFormatInfo = record
@@ -104,9 +105,11 @@ type
 
   PAudioConverterInfo = ^TAudioConverterInfo;
   TAudioConverterInfo = record
-    open: function(inputFormat: PCAudioFormatInfo; outputFormat: PCAudioFormatInfo): PAudioResampleStream; cdecl;
-    close: procedure(stream: PAudioResampleStream); cdecl;
-    convert: function(stream: PAudioResampleStream; input, output: PCuint8; numSamples: cint): cint; cdecl;
+    open: function(inputFormat: PCAudioFormatInfo; outputFormat: PCAudioFormatInfo): PAudioConvertStream; cdecl;
+    close: procedure(stream: PAudioConvertStream); cdecl;
+    convert: function(stream: PAudioConvertStream; input, output: PCuint8; numSamples: PCint): cint; cdecl;
+	  getOutputBufferSize: function(stream: PAudioConvertStream; inputSize: cint): cint; cdecl;
+    getRatio: function(stream: PAudioConvertStream): double; cdecl;
   end;
 
   PMediaPluginInfo = ^TMediaPluginInfo;
@@ -119,10 +122,29 @@ type
     audioConverter: PAudioConverterInfo;
   end;
 
-  Plugin_register = function(core: PMediaPluginCore): PMediaPluginInfo; cdecl;
+  Plugin_registerFunc = function(core: PMediaPluginCore): PMediaPluginInfo; cdecl;
+
+const
+{$IFDEF MSWINDOWS}
+  ffmpegPlugin = 'ffmpeg_playback.dll';
+{$ENDIF}
+{$IFDEF LINUX}
+  ffmpegPlugin = 'ffmpeg_playback';
+{$ENDIF}
+{$IFDEF DARWIN}
+  ffmpegPlugin = 'ffmpeg_playback.dylib';
+  {$linklib ffmpegPlugin}
+{$ENDIF}
+
+function Plugin_register(core: PMediaPluginCore): PMediaPluginInfo;
+  cdecl; external ffmpegPlugin;
+
 
 function MediaPluginCore: PMediaPluginCore;
 
+procedure AudioFormatInfoToCStruct(
+    const Info: TAudioFormatInfo; var CInfo: TCAudioFormatInfo);
+
 implementation
 
 uses
@@ -147,6 +169,14 @@ begin
   Result := @MediaPluginCore_Instance;
 end;
 
+procedure AudioFormatInfoToCStruct(
+    const Info: TAudioFormatInfo; var CInfo: TCAudioFormatInfo);
+begin
+  CInfo.sampleRate := Info.SampleRate;
+  CInfo.channels := Info.Channels;
+  CInfo.format := Ord(Info.Format);
+end;
+
 {* Misc *}
 
 procedure Core_log(level: cint; msg: PChar; context: PChar); cdecl;
-- 
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