Handle hardware that only supports 48khz output (eg. Intel8x0, on

nForce boards).  Allow drivers to tell whether specific sample rates
are supported (instead of "all or nothing").

Warning: this will break the Windows (and possibly OS X) drivers for
a few minutes until I update them.

stepmania/src/arch/Sound/ALSA9Helpers.cpp

@@ -11,6 +11,21 @@
 #define ALSA_ASSERT(x) \
         if (err < 0) { LOG->Warn("ALSA9: %s: %s", x, dsnd_strerror(err)); }
 
+/* If the given sample rate can be used, return it.  Otherwise, return the
+ * samplerate to use instead. */
+unsigned Alsa9Buf::FindSampleRate( unsigned rate )
+{
+	snd_pcm_hw_params_t *testhw;
+	dsnd_pcm_hw_params_alloca( &testhw );
+	dsnd_pcm_hw_params_any( pcm, testhw );
+
+	int err = dsnd_pcm_hw_params_set_rate_near(pcm, testhw, &rate, 0);
+	if( err >= 0 )
+		return rate;
+
+	return 0;
+}
+
 bool Alsa9Buf::SetHWParams()
 {
 	int err;
@@ -45,11 +60,7 @@ bool Alsa9Buf::SetHWParams()
 	err = dsnd_pcm_hw_params_set_channels(pcm, hwparams, 2);
 	ALSA_CHECK("dsnd_pcm_hw_params_set_channels");
 
-	/* Set the sample rate.  We shouldn't need to set it if rate is DYNAMIC_SAMPLERATE,
+	/* Set the sample rate. */
-	 * but I've had alsalib crashes if I don't. */
-	if( samplerate == Alsa9Buf::DYNAMIC_SAMPLERATE )
-		samplerate = 44100;
-	
 	unsigned int rate = samplerate;
 	err = dsnd_pcm_hw_params_set_rate_near(pcm, hwparams, &rate, 0);
 	ALSA_CHECK("dsnd_pcm_hw_params_set_rate_near");
@@ -139,21 +150,21 @@ void Alsa9Buf::ErrorHandler(const char *file, int line, const char *function, in
 /* NOP */
 }
 
-Alsa9Buf::Alsa9Buf( hw hardware, int channels_, int samplerate_ )
+Alsa9Buf::Alsa9Buf( hw hardware, int channels_ )
 {
 	GetSoundCardDebugInfo();
 		
 	dsnd_lib_error_set_handler( ErrorHandler );
 	
 	channels = channels_;
-	samplerate = samplerate_;
+	samplerate = 44100;
 	samplebits = 16;
 	last_cursor_pos = 0;
 	
 	/* Open the device. */
 	int err;
 //	err = dsnd_pcm_open( &pcm, "dmix", SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK );
-	err = dsnd_pcm_open( &pcm, "default", SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK );
+	err = dsnd_pcm_open( &pcm, "hw:0", SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK );
 	if (err < 0)
 		RageException::ThrowNonfatal("dsnd_pcm_open: %s", dsnd_strerror(err));
 
@@ -251,7 +262,7 @@ void Alsa9Buf::Write( const Sint16 *buffer, int frames )
 
 	last_cursor_pos += wrote;
 	if( wrote < frames )
-		LOG->Trace("Couldn't write whole buffer? (%i < %i)\n", wrote, frames );
+		LOG->Trace("Couldn't write whole buffer? (%i < %i)", wrote, frames );
 }
 
 

stepmania/src/arch/Sound/ALSA9Helpers.h

@@ -28,14 +28,13 @@ public:
 		
 	enum hw { HW_HARDWARE, HW_SOFTWARE, HW_DONT_CARE };
 
-	/* If samplerate is DYNAMIC_SAMPLERATE, then call SetSampleRate before
+	/* Call SetSampleRate before you use the sample. */
-	 * you use the sample. */
+	Alsa9Buf( hw hardware, int channels );
-	enum { DYNAMIC_SAMPLERATE = -1 };
-	Alsa9Buf( hw hardware, int channels, int samplerate );
 	~Alsa9Buf();
 
 	int GetNumFramesToFill( int writeahead );
 	void Write( const Sint16 *buffer, int frames );
+	unsigned FindSampleRate( unsigned rate );
 	
 	void Reset();
 	void Play();

stepmania/src/arch/Sound/RageSoundDriver.h

@@ -37,7 +37,7 @@ protected:
 	 * get it. */
 	virtual void VolumeChanged() { }
 
-	virtual int GetSampleRate() const { return 44100; }
+	virtual int GetSampleRate( int rate ) const { return 44100; }
 
 public:
 	virtual ~RageSoundDriver() { }

stepmania/src/arch/Sound/RageSoundDriver_ALSA9.cpp

@@ -208,6 +208,14 @@ int RageSound_ALSA9::GetPosition(const RageSound *snd) const
 	return stream_pool[i]->pcm->GetPosition();
 }       
 
+int RageSound_ALSA9::GetSampleRate( int rate ) const
+{
+	LockMutex L(SOUNDMAN->lock);
+
+	stream *str = stream_pool[0];
+	return str->pcm->FindSampleRate( rate );
+}
+	
 
 RageSound_ALSA9::RageSound_ALSA9()
 {
@@ -222,7 +230,7 @@ try {
 	{
 		Alsa9Buf *newbuf;
 		try {
-			newbuf = new Alsa9Buf( Alsa9Buf::HW_HARDWARE, channels, Alsa9Buf::DYNAMIC_SAMPLERATE );
+			newbuf = new Alsa9Buf( Alsa9Buf::HW_HARDWARE, channels );
 		} catch(const RageException &e) {
 			/* If we didn't get at least 8, fail. */
 			if(i >= 8) break; /* OK */

stepmania/src/arch/Sound/RageSoundDriver_ALSA9.h

@@ -51,7 +51,7 @@ public:
 	void StartMixing(RageSound *snd);
 	void StopMixing(RageSound *snd);
 	int GetPosition(const RageSound *snd) const;
-	int GetSampleRate() const { return -1; }
+	int GetSampleRate( int rate ) const;
 
 	void Update(float delta);
 

stepmania/src/arch/Sound/RageSoundDriver_ALSA9_Software.cpp

@@ -15,7 +15,7 @@
 #include <sys/resource.h>
 
 const int channels = 2;
-const int samplerate = 44100;
+int samplerate = 44100;
 
 const int samples_per_frame = channels;
 const int bytes_per_frame = sizeof(Sint16) * samples_per_frame;
@@ -176,7 +176,10 @@ try {
 	if( PREFSMAN->m_iSoundWriteAhead )
 		max_writeahead = PREFSMAN->m_iSoundWriteAhead;
 
-	pcm = new Alsa9Buf( Alsa9Buf::HW_DONT_CARE, channels, samplerate );
+	pcm = new Alsa9Buf( Alsa9Buf::HW_DONT_CARE, channels );
+
+	samplerate = pcm->FindSampleRate( samplerate );
+	pcm->SetSampleRate( samplerate );
 	
 	MixingThread.SetName( "RageSound_ALSA9_Software" );
 	MixingThread.Create( MixerThread_start, this );
@@ -205,6 +208,11 @@ float RageSound_ALSA9_Software::GetPlayLatency() const
 	return float(max_writeahead)/samplerate;
 }
 
+int RageSound_ALSA9_Software::GetSampleRate( int rate ) const
+{
+	return samplerate;
+}
+		
 /*
  * Copyright (c) 2002 by the person(s) listed below.  All rights reserved.
  *

stepmania/src/arch/Sound/RageSoundDriver_ALSA9_Software.h

@@ -37,6 +37,7 @@ public:
 	void StopMixing(RageSound *snd);
 	int GetPosition(const RageSound *snd) const;
 	float GetPlayLatency() const;
+        int GetSampleRate( int rate ) const;
 	
 	void Update(float delta);
 

stepmania/src/arch/Sound/RageSoundDriver_OSS.h

@@ -32,7 +32,7 @@ class RageSound_OSS: public RageSoundDriver
 public:
 	bool GetData();
 	void Update(float delta);
-	int GetSampleRate() const { return samplerate; }
+	int GetSampleRate( int rate ) const { return samplerate; }
 
 	/* virtuals: */
 	void StartMixing(RageSound *snd);	/* used by RageSound */