From e33ae316fae37681296790fcd638be29f1c88459 Mon Sep 17 00:00:00 2001
From: Chris Robinson <chris.kcat@gmail.com>
Date: Sat, 18 Jun 2011 17:02:44 -0700
Subject: [PATCH] Add a function to get the number of samples from a stream

---
 include/AL/alure.h |  2 ++
 include/main.h     |  2 ++
 src/stream.cpp     | 22 ++++++++++++++++++++++
 3 files changed, 26 insertions(+)

diff --git a/include/AL/alure.h b/include/AL/alure.h
index 98e1f77..b0e3df1 100644
--- a/include/AL/alure.h
+++ b/include/AL/alure.h
@@ -85,6 +85,7 @@ ALURE_API alureStream* ALURE_APIENTRY alureCreateStreamFromCallback(
     ALuint (*callback)(void *userdata, ALubyte *data, ALuint bytes),
     void *userdata, ALenum format, ALuint samplerate,
     ALsizei chunkLength, ALsizei numBufs, ALuint *bufs);
+ALURE_API alureInt64 ALURE_APIENTRY alureGetStreamLength(alureStream *stream);
 ALURE_API ALsizei ALURE_APIENTRY alureGetStreamFrequency(alureStream *stream);
 ALURE_API ALsizei ALURE_APIENTRY alureBufferDataFromStream(alureStream *stream, ALsizei numBufs, ALuint *bufs);
 ALURE_API ALboolean ALURE_APIENTRY alureRewindStream(alureStream *stream);
@@ -137,6 +138,7 @@ typedef alureStream*    (ALURE_APIENTRY *LPALURECREATESTREAMFROMFILE)(const ALch
 typedef alureStream*    (ALURE_APIENTRY *LPALURECREATESTREAMFROMMEMORY)(const ALubyte*,ALuint,ALsizei,ALsizei,ALuint*);
 typedef alureStream*    (ALURE_APIENTRY *LPALURECREATESTREAMFROMSTATICMEMORY)(const ALubyte*,ALuint,ALsizei,ALsizei,ALuint*);
 typedef alureStream*    (ALURE_APIENTRY *LPALURECREATESTREAMFROMCALLBACK)(ALuint(*)(void*,ALubyte*,ALuint),void*,ALenum,ALuint,ALsizei,ALsizei,ALuint*);
+typedef alureInt64      (ALURE_APIENTRY *LPALUREGETSTREAMLENGTH)(alureStream*);
 typedef ALsizei         (ALURE_APIENTRY *LPALUREGETSTREAMFREQUENCY)(alureStream*);
 typedef ALsizei         (ALURE_APIENTRY *LPALUREBUFFERDATAFROMSTREAM)(alureStream*,ALsizei,ALuint*);
 typedef ALboolean       (ALURE_APIENTRY *LPALUREREWINDSTREAM)(alureStream*);
diff --git a/include/main.h b/include/main.h
index 94423bc..54a5aa2 100644
--- a/include/main.h
+++ b/include/main.h
@@ -157,6 +157,8 @@ struct alureStream {
     }
     virtual bool SetPatchset(const char*)
     { return true; }
+    virtual alureInt64 GetLength()
+    { return 0; }
 
     alureStream(std::istream *_stream)
       : data(NULL), fstream(_stream)
diff --git a/src/stream.cpp b/src/stream.cpp
index c18e523..4607489 100644
--- a/src/stream.cpp
+++ b/src/stream.cpp
@@ -533,6 +533,28 @@ ALURE_API ALboolean ALURE_APIENTRY alureSetStreamPatchset(alureStream *stream, c
     return stream->SetPatchset(patchset);
 }
 
+/* Function: alureGetStreamLength
+ *
+ * Retrieves an approximate number of samples for the stream. Not all streams
+ * or decoders can return such info, and may return 0 if the stream length is
+ * unknown.
+ *
+ * Returns:
+ * -1 on error.
+ *
+ * *Version Added*: 1.2
+ */
+ALURE_API alureInt64 ALURE_APIENTRY alureGetStreamLength(alureStream *stream)
+{
+    if(!alureStream::Verify(stream))
+    {
+        SetError("Invalid stream pointer");
+        return -1;
+    }
+
+    return stream->GetLength();
+}
+
 /* Function: alureDestroyStream
  *
  * Closes an opened stream. For convenience, it will also delete the given
-- 
2.11.4.GIT