add music support

Author: codenamecpp

src/AudioDataStream.cpp

@@ -0,0 +1,108 @@
+#include "stdafx.h"
+#include "AudioDataStream.h"
+#include "wave_utils.h"
+#include "FileSystem.h"
+
+//////////////////////////////////////////////////////////////////////////
+
+const char* AudioFileExtWAVE = ".wav";
+
+//////////////////////////////////////////////////////////////////////////
+
+// wave file stream implementation
+
+class WaveFileStream: public AudioDataStream
+{
+public:
+    WaveFileStream()
+        : mWaveReader(mFileStream)
+    {
+    }
+    bool OpenFileStream(const std::string& fileName)
+    {
+        if (!gFiles.OpenBinaryFile(fileName, mFileStream))
+            return false;
+
+        return mWaveReader.parse_audio();
+    }
+
+    int GetChannelsCount() const override { return mWaveReader.mChannelsCount; }
+    int GetSampleRate() const override { return mWaveReader.mSampleRate; }
+    int GetSampleBits() const override { return mWaveReader.mSampleBits; }
+    int GetSamplesCount() const override { return mWaveReader.mSamplesCount; }
+
+    int ReadPCMSamples(int samples, void* buffer) override
+    {
+        return mWaveReader.read_pcm_samples(samples, buffer);
+    }
+    bool SeekPCMFromBeg(int samples) override
+    {
+        return mWaveReader.seek_pcm_beg(samples);
+    }
+    bool SeekPCMFromEnd(int samples) override
+    {
+        return mWaveReader.seek_pcm_end(samples);
+    }
+    bool SeekPCMFromCur(int samples) override
+    {
+        return mWaveReader.seek_pcm_cur(samples);
+    }
+    bool EndOfStream() const override
+    {
+        return mWaveReader.end_of_stream();
+    }
+
+private:
+    std::ifstream mFileStream;
+    cxx::wave_reader mWaveReader;
+};
+
+//////////////////////////////////////////////////////////////////////////
+
+extern AudioDataStream* OpenAudioFileStream(const char* fileName)
+{
+    std::string fileNameWithExt;
+    std::string fileExt = cxx::get_file_extension(fileName);
+    // detect file extension
+    if (fileExt.empty())
+    {
+        static const char* knownAudioExtensions[] =
+        {
+            AudioFileExtWAVE
+        };
+
+        for (const char* currExt: knownAudioExtensions)
+        {
+            std::string currFileName = cxx::va("%s%s", fileName, currExt);
+            if (gFiles.IsFileExists(currFileName))
+            {
+                fileExt = currExt;
+                fileNameWithExt = currFileName;
+                break;
+            }
+        }
+
+        if (fileExt.empty())
+            return nullptr;
+    }
+    else
+    {
+        fileNameWithExt = fileName;
+
+        std::transform(fileExt.begin(), fileExt.end(), fileExt.begin(), ::tolower);
+    }
+
+    AudioDataStream* audioDataStream = nullptr;
+
+    if (fileExt == AudioFileExtWAVE)
+    {
+        WaveFileStream* waveFileStream = new WaveFileStream;
+        if (!waveFileStream->OpenFileStream(fileNameWithExt))
+        {
+            SafeDelete(waveFileStream);
+        }
+        audioDataStream = waveFileStream;
+    }
+    return audioDataStream;
+}
+

src/AudioDataStream.h

@@ -0,0 +1,26 @@
+#pragma once
+
+// Interface class of streaming audio data
+class AudioDataStream: public cxx::noncopyable
+{
+public:
+    virtual ~AudioDataStream()
+    {
+    }
+
+    // get media format info
+    virtual int GetChannelsCount() const = 0;
+    virtual int GetSampleRate() const = 0;
+    virtual int GetSampleBits() const = 0;
+    virtual int GetSamplesCount() const = 0;
+
+    // reading pcm samples data from stream
+    virtual int ReadPCMSamples(int samples, void* buffer) = 0;
+    virtual bool SeekPCMFromBeg(int samples) = 0;
+    virtual bool SeekPCMFromEnd(int samples) = 0;
+    virtual bool SeekPCMFromCur(int samples) = 0;
+    virtual bool EndOfStream() const = 0;
+};
+
+// open audio stream
+extern AudioDataStream* OpenAudioFileStream(const char* fileName);

src/AudioListener.h

@@ -5,6 +5,10 @@ class AudioListener final: public cxx::noncopyable
 {
     friend class AudioDevice;
 
+public:
+    // readonly
+    glm::vec3 mPosition;
+
 public:
     AudioListener() 
         : mPosition(0.0f, 0.0f, 1.0f)
@@ -20,6 +24,4 @@ class AudioListener final: public cxx::noncopyable
         mPosition.x = position.x;
         mPosition.y = position.y;
     }
-private:
-    glm::vec3 mPosition;
 };