276 lines
7.0 KiB
C++
276 lines
7.0 KiB
C++
#include "global.h"
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#include "RageSoundDriver_ALSA9.h"
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#include "RageLog.h"
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#include "RageSound.h"
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#include "RageSoundManager.h"
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#include "RageUtil.h"
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#include "ALSA9Dynamic.h"
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const int channels = 2;
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const int samplerate = 44100;
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const int samples_per_frame = channels;
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const int bytes_per_frame = sizeof(Sint16) * samples_per_frame;
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const unsigned max_writeahead = 1024*8;
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const int num_chunks = 8;
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const int chunksize = max_writeahead / num_chunks;
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int RageSound_ALSA9::MixerThread_start(void *p)
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{
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((RageSound_ALSA9 *) p)->MixerThread();
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return 0;
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}
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void RageSound_ALSA9::MixerThread()
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{
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/* SOUNDMAN will be set once RageSoundManager's ctor returns and
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* assigns it; we might get here before that happens, though. */
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while(!SOUNDMAN && !shutdown) SDL_Delay(10);
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while(!shutdown)
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{
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/* Sleep for the size of one chunk. */
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const int chunksize_frames = max_writeahead / num_chunks;
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float sleep_secs = (float(chunksize_frames) / samplerate);
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SDL_Delay( 20 ); // int(1000 * sleep_secs));
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LockMutex L(SOUNDMAN->lock);
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for( unsigned i = 0; i < stream_pool.size(); ++i )
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{
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if( stream_pool[i]->state == stream_pool[i]->INACTIVE )
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continue; /* inactive */
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while( stream_pool[i]->GetData(false) )
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;
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}
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}
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}
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RageSound_ALSA9::stream::~stream()
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{
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delete pcm;
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}
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/* Returns the number of frames processed */
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bool RageSound_ALSA9::stream::GetData(bool init)
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{
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int frames_to_fill = pcm->GetNumFramesToFill( max_writeahead );
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if( !init )
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frames_to_fill = min( frames_to_fill, chunksize );
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if( frames_to_fill < chunksize )
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return false;
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static Sint16 *buf = NULL;
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if ( !buf )
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buf = new Sint16[max_writeahead*samples_per_frame];
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unsigned len = frames_to_fill*bytes_per_frame;
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/* It might be INACTIVE, when we're prebuffering. We just don't want to
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* fill anything in STOPPING; in that case, we just clear the audio buffer. */
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if( state != STOPPING )
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{
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const unsigned got = snd->GetPCM( (char *) buf, len, pcm->GetPlayPos() );
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if( got < len )
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{
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/* Fill the remainder of the buffer with silence. */
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memset( buf+got, 0, len-got );
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/* STOPPING tells the mixer thread to release the stream once str->flush_bufs
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* buffers have been flushed. */
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state = STOPPING;
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/* Flush two buffers worth of data. */
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flush_pos = pcm->GetPlayPos();
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}
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} else {
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/* Silence the buffer. */
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memset( buf, 0, len );
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}
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RageSoundManager::AttenuateBuf( buf, max_writeahead*samples_per_frame, SOUNDMAN->GetMixVolume() );
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pcm->Write( buf, frames_to_fill );
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return true;
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}
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void RageSound_ALSA9::StartMixing(RageSound *snd)
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{
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LockMutex L(SOUNDMAN->lock);
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/* Find an unused buffer. */
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unsigned i;
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for( i = 0; i < stream_pool.size(); ++i )
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{
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if( stream_pool[i]->state == stream_pool[i]->INACTIVE )
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break;
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}
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if( i == stream_pool.size() )
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{
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/* We don't have a free sound buffer. Fake it. */
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SOUNDMAN->AddFakeSound(snd);
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return;
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}
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/* Give the stream to the playing sound and remove it from the pool. */
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stream_pool[i]->snd = snd;
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stream_pool[i]->pcm->SetSampleRate( snd->GetSampleRate() );
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/* Pre-buffer the stream. */
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stream_pool[i]->GetData(true);
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stream_pool[i]->pcm->Play();
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/* Normally, at this point we should still be INACTIVE, in which case,
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* tell the mixer thread to start mixing this channel. However, if it's
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* been changed to STOPPING, then we actually finished the whole file
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* in the prebuffering GetData calls above, so leave it alone and let it
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* finish on its own. */
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if( stream_pool[i]->state == stream_pool[i]->INACTIVE )
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stream_pool[i]->state = stream_pool[i]->PLAYING;
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}
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void RageSound_ALSA9::Update(float delta)
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{
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/* SoundStopped might erase sounds out from under us, so make a copy
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* of the sound list. */
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vector<stream *> str = stream_pool;
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ASSERT( SOUNDMAN );
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LockMutex L( SOUNDMAN->lock );
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for(unsigned i = 0; i < str.size(); ++i)
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{
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if( str[i]->state != str[i]->STOPPING )
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continue;
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int ps = str[i]->pcm->GetPosition();
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if( ps < str[i]->flush_pos )
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continue; /* stopping but still flushing */
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/* The sound has stopped and flushed all of its buffers. */
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if( str[i]->snd != NULL )
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str[i]->snd->StopPlaying();
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str[i]->snd = NULL;
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str[i]->pcm->Stop();
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str[i]->state = str[i]->INACTIVE;
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}
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}
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void RageSound_ALSA9::StopMixing(RageSound *snd)
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{
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ASSERT(snd != NULL);
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LockMutex L(SOUNDMAN->lock);
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unsigned i;
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for( i = 0; i < stream_pool.size(); ++i )
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if(stream_pool[i]->snd == snd)
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break;
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if( i == stream_pool.size() )
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{
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LOG->Trace("not stopping a sound because it's not playing");
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return;
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}
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/* STOPPING tells the mixer thread to release the stream once str->flush_bufs
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* buffers have been flushed. */
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stream_pool[i]->state = stream_pool[i]->STOPPING;
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/* Flush two buffers worth of data. */
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stream_pool[i]->flush_pos = stream_pool[i]->pcm->GetPlayPos();
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/* This function is called externally (by RageSound) to stop immediately.
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* We need to prevent SoundStopped from being called; it should only be
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* called when we stop implicitely at the end of a sound. Set snd to NULL. */
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stream_pool[i]->snd = NULL;
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}
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int RageSound_ALSA9::GetPosition(const RageSound *snd) const
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{
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LockMutex L(SOUNDMAN->lock);
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unsigned i;
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for( i = 0; i < stream_pool.size(); ++i )
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if( stream_pool[i]->snd == snd )
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break;
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if( i == stream_pool.size() )
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RageException::Throw("GetPosition: Sound %s is not being played", snd->GetLoadedFilePath().c_str());
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return stream_pool[i]->pcm->GetPosition();
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}
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RageSound_ALSA9::RageSound_ALSA9()
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{
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CString err = LoadALSA();
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if( err != "" )
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RageException::ThrowNonfatal("Driver unusable: %s", err.c_str());
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try {
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shutdown = false;
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/* Create a bunch of streams and put them into the stream pool. */
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for( int i = 0; i < 32; ++i )
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{
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Alsa9Buf *newbuf;
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try {
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newbuf = new Alsa9Buf( Alsa9Buf::HW_HARDWARE, channels, Alsa9Buf::DYNAMIC_SAMPLERATE );
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} catch(const RageException &e) {
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/* If we didn't get at least 8, fail. */
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if(i >= 8) break; /* OK */
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/* Clean up; the dtor won't be called. */
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for(int n = 0; n < i; ++n)
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delete stream_pool[n];
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if( !i )
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RageException::ThrowNonfatal( "%s", e.what() );
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/* We created at least one hardware buffer. */
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LOG->Trace("Could only create %i buffers; need at least 8 (failed with %s). Hardware ALSA driver can't be used.", i, e.what());
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RageException::ThrowNonfatal("Driver unusable (not enough mixing streams)");
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}
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stream *s = new stream;
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s->pcm = newbuf;
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stream_pool.push_back(s);
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}
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LOG->Info("ALSA: Got %i hardware buffers", stream_pool.size());
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MixingThread.SetName( "RageSound_ALSA9" );
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MixingThread.Create( MixerThread_start, this );
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} catch(...) {
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UnloadALSA();
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throw;
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}
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}
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RageSound_ALSA9::~RageSound_ALSA9()
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{
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/* Signal the mixing thread to quit. */
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shutdown = true;
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LOG->Trace("Shutting down mixer thread ...");
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MixingThread.Wait();
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LOG->Trace("Mixer thread shut down.");
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for(unsigned i = 0; i < stream_pool.size(); ++i)
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delete stream_pool[i];
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UnloadALSA();
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}
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/*
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* Copyright (c) 2002 by the person(s) listed below. All rights reserved.
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*
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* Glenn Maynard (RageSoundDriver_WaveOut)
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*/
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