Fixed inconsistent seek behavior in SoundStream

include/SFML/Audio/InputSoundFile.hpp

@@ -32,6 +32,7 @@
 #include <SFML/System/NonCopyable.hpp>
 #include <SFML/System/Time.hpp>
 #include <string>
+#include <algorithm>
 
 
 namespace sf
@@ -146,6 +147,22 @@ public:
     ////////////////////////////////////////////////////////////
     Time getDuration() const;
 
+    ////////////////////////////////////////////////////////////
+    /// \brief Get the read offset of the file in time
+    ///
+    /// \return Time position
+    ///
+    ////////////////////////////////////////////////////////////
+    Time getTimeOffset() const;
+
+    ////////////////////////////////////////////////////////////
+    /// \brief Get the read offset of the file in samples
+    ///
+    /// \return Sample position
+    ///
+    ////////////////////////////////////////////////////////////
+    Uint64 getSampleOffset() const;
+
     ////////////////////////////////////////////////////////////
     /// \brief Change the current read position to the given sample offset
     ///
@@ -203,6 +220,7 @@ private:
     SoundFileReader* m_reader;       ///< Reader that handles I/O on the file's format
     InputStream*     m_stream;       ///< Input stream used to access the file's data
     bool             m_streamOwned;  ///< Is the stream internal or external?
+    Uint64           m_sampleOffset; ///< Sample Read Position
     Uint64           m_sampleCount;  ///< Total number of samples in the file
     unsigned int     m_channelCount; ///< Number of channels of the sound
     unsigned int     m_sampleRate;   ///< Number of samples per second

include/SFML/Audio/Music.hpp

@@ -169,7 +169,6 @@ private:
     // Member data
     ////////////////////////////////////////////////////////////
     InputSoundFile     m_file;    ///< The streamed music file
-    Time               m_duration; ///< Music duration
     std::vector<Int16> m_samples; ///< Temporary buffer of samples
     Mutex              m_mutex;   ///< Mutex protecting the data
 };

include/SFML/Audio/SoundStream.hpp

@@ -254,11 +254,12 @@ private:
     /// playing queue.
     ///
     /// \param bufferNum Number of the buffer to fill (in [0, BufferCount])
+    /// \param immediateLoop Treat empty buffers as spent, and act on loops immediately
     ///
     /// \return True if the stream source has requested to stop, false otherwise
     ///
     ////////////////////////////////////////////////////////////
-    bool fillAndPushBuffer(unsigned int bufferNum);
+    bool fillAndPushBuffer(unsigned int bufferNum, bool immediateLoop = false);
 
     ////////////////////////////////////////////////////////////
     /// \brief Fill the audio buffers and put them all into the playing queue

src/SFML/Audio/InputSoundFile.cpp

@@ -41,6 +41,7 @@ InputSoundFile::InputSoundFile() :
 m_reader      (NULL),
 m_stream      (NULL),
 m_streamOwned (false),
+m_sampleOffset   (0),
 m_sampleCount (0),
 m_channelCount(0),
 m_sampleRate  (0)
@@ -195,15 +196,42 @@ unsigned int InputSoundFile::getSampleRate() const
 ////////////////////////////////////////////////////////////
 Time InputSoundFile::getDuration() const
 {
+    // Make sure we don't divide by 0
+    if (m_channelCount == 0 || m_sampleRate == 0)
+        return Time::Zero;
+
     return seconds(static_cast<float>(m_sampleCount) / m_channelCount / m_sampleRate);
 }
 
 
+////////////////////////////////////////////////////////////
+Time InputSoundFile::getTimeOffset() const
+{
+    // Make sure we don't divide by 0
+    if (m_channelCount == 0 || m_sampleRate == 0)
+        return Time::Zero;
+
+    return seconds(static_cast<float>(m_sampleOffset) / m_channelCount / m_sampleRate);
+}
+
+
+////////////////////////////////////////////////////////////
+Uint64 InputSoundFile::getSampleOffset() const
+{
+    return m_sampleOffset;
+}
+
+
 ////////////////////////////////////////////////////////////
 void InputSoundFile::seek(Uint64 sampleOffset)
 {
     if (m_reader)
-        m_reader->seek(sampleOffset);
+    {
+        // The reader handles an overrun gracefully, but we
+        // pre-check to keep our known position consistent
+        m_sampleOffset = std::min(sampleOffset, m_sampleCount);
+        m_reader->seek(m_sampleOffset);
+    }
 }
 
 
@@ -217,10 +245,11 @@ void InputSoundFile::seek(Time timeOffset)
 ////////////////////////////////////////////////////////////
 Uint64 InputSoundFile::read(Int16* samples, Uint64 maxCount)
 {
+    Uint64 readSamples = 0;
     if (m_reader && samples && maxCount)
-        return m_reader->read(samples, maxCount);
+        readSamples = m_reader->read(samples, maxCount);
-    else
+    m_sampleOffset += readSamples;
-        return 0;
+    return readSamples;
 }
 
 
@@ -238,6 +267,7 @@ void InputSoundFile::close()
         m_streamOwned = false;
     }
     m_stream = NULL;
+    m_sampleOffset = 0;
 
     // Reset the sound file attributes
     m_sampleCount = 0;

src/SFML/Audio/Music.cpp

@@ -36,8 +36,7 @@ namespace sf
 {
 ////////////////////////////////////////////////////////////
 Music::Music() :
-m_file    (),
+m_file    ()
-m_duration()
 {
 
 }
@@ -105,7 +104,7 @@ bool Music::openFromStream(InputStream& stream)
 ////////////////////////////////////////////////////////////
 Time Music::getDuration() const
 {
-    return m_duration;
+    return m_file.getDuration();
 }
 
 
@@ -118,8 +117,8 @@ bool Music::onGetData(SoundStream::Chunk& data)
     data.samples     = &m_samples[0];
     data.sampleCount = static_cast<std::size_t>(m_file.read(&m_samples[0], m_samples.size()));
 
-    // Check if we have reached the end of the audio file
+    // Check if we have stopped obtaining samples or reached the end of the audio file
-    return data.sampleCount == m_samples.size();
+    return (data.sampleCount != 0) && (m_file.getSampleOffset() < m_file.getSampleCount());
 }
 
 
@@ -135,9 +134,6 @@ void Music::onSeek(Time timeOffset)
 ////////////////////////////////////////////////////////////
 void Music::initialize()
 {
-    // Compute the music duration
-    m_duration = m_file.getDuration();
-
     // Resize the internal buffer so that it can contain 1 second of audio samples
     m_samples.resize(m_file.getSampleRate() * m_file.getChannelCount());
 

src/SFML/Audio/SoundStream.cpp

@@ -78,6 +78,8 @@ void SoundStream::initialize(unsigned int channelCount, unsigned int sampleRate)
 {
     m_channelCount = channelCount;
     m_sampleRate = sampleRate;
+    m_samplesProcessed = 0;
+    m_isStreaming = false;
 
     // Deduce the format from the number of channels
     m_format = priv::AudioDevice::getFormatFromChannelCount(channelCount);
@@ -127,11 +129,7 @@ void SoundStream::play()
         stop();
     }
 
-    // Move to the beginning
-    onSeek(Time::Zero);
-
     // Start updating the stream in a separate thread to avoid blocking the application
-    m_samplesProcessed = 0;
     m_isStreaming = true;
     m_threadStartState = Playing;
     m_thread.launch();
@@ -397,7 +395,7 @@ void SoundStream::streamData()
 
 
 ////////////////////////////////////////////////////////////
-bool SoundStream::fillAndPushBuffer(unsigned int bufferNum)
+bool SoundStream::fillAndPushBuffer(unsigned int bufferNum, bool immediateLoop)
 {
     bool requestStop = false;
 
@@ -417,6 +415,13 @@ bool SoundStream::fillAndPushBuffer(unsigned int bufferNum)
             // If we previously had no data, try to fill the buffer once again
             if (!data.samples || (data.sampleCount == 0))
             {
+                // If immediateLoop is specified, we have to immediately adjust the sample count
+                if (immediateLoop)
+                {
+                    // We just tried to begin preloading at EOF: reset the sample count
+                    m_samplesProcessed = 0;
+                    m_endBuffers[bufferNum] = false;
+                }
                 return fillAndPushBuffer(bufferNum);
             }
         }
@@ -451,7 +456,9 @@ bool SoundStream::fillQueue()
     bool requestStop = false;
     for (int i = 0; (i < BufferCount) && !requestStop; ++i)
     {
-        if (fillAndPushBuffer(i))
+        // Since no sound has been loaded yet, we can't schedule loop seeks preemptively,
+        // So if we start on EOF or Loop End, we let fillAndPushBuffer() adjust the sample count
+        if (fillAndPushBuffer(i, (i == 0)))
             requestStop = true;
     }