along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
-#include "quakedef.h"
-#include "snd_main.h"
+#include <math.h>
#include <SDL.h>
-/*
-Info:
-One SDL sample consists of x channel samples
-The mixer supposes that the driver has one channel entry/sample though it has x channels/sample
-like the SDL
-*/
-
-#define AUDIO_SDL_SAMPLES 4096
-#define AUDIO_LOCALFACTOR 4
+#include "quakedef.h"
-typedef struct AudioState_s
-{
- int width;
- int size;
- int pos;
- void *buffer;
-} AudioState;
+#include "snd_main.h"
-static AudioState as;
+static unsigned int sdlaudiotime = 0;
-static void Buffer_Callback(void *userdata, Uint8 *stream, int len);
-/*
-==================
-S_BlockSound
-==================
-*/
-void S_BlockSound( void )
+// Note: SDL calls SDL_LockAudio() right before this function, so no need to lock the audio data here
+static void Buffer_Callback (void *userdata, Uint8 *stream, int len)
{
- snd_blocked++;
-
- if( snd_blocked == 1 )
- SDL_PauseAudio( true );
+ unsigned int factor, RequestedFrames, MaxFrames, FrameCount;
+ unsigned int StartOffset, EndOffset;
+
+ factor = snd_renderbuffer->format.channels * snd_renderbuffer->format.width;
+ if ((unsigned int)len % factor != 0)
+ Sys_Error("SDL sound: invalid buffer length passed to Buffer_Callback (%d bytes)\n", len);
+
+ RequestedFrames = (unsigned int)len / factor;
+
+ if (SndSys_LockRenderBuffer())
+ {
+ if (snd_usethreadedmixing)
+ {
+ S_MixToBuffer(stream, RequestedFrames);
+ if (snd_blocked)
+ memset(stream, snd_renderbuffer->format.width == 1 ? 0x80 : 0, len);
+ SndSys_UnlockRenderBuffer();
+ return;
+ }
+
+ // Transfert up to a chunk of samples from snd_renderbuffer to stream
+ MaxFrames = snd_renderbuffer->endframe - snd_renderbuffer->startframe;
+ if (MaxFrames > RequestedFrames)
+ FrameCount = RequestedFrames;
+ else
+ FrameCount = MaxFrames;
+ StartOffset = snd_renderbuffer->startframe % snd_renderbuffer->maxframes;
+ EndOffset = (snd_renderbuffer->startframe + FrameCount) % snd_renderbuffer->maxframes;
+ if (StartOffset > EndOffset) // if the buffer wraps
+ {
+ unsigned int PartialLength1, PartialLength2;
+
+ PartialLength1 = (snd_renderbuffer->maxframes - StartOffset) * factor;
+ memcpy(stream, &snd_renderbuffer->ring[StartOffset * factor], PartialLength1);
+
+ PartialLength2 = FrameCount * factor - PartialLength1;
+ memcpy(&stream[PartialLength1], &snd_renderbuffer->ring[0], PartialLength2);
+ }
+ else
+ memcpy(stream, &snd_renderbuffer->ring[StartOffset * factor], FrameCount * factor);
+
+ snd_renderbuffer->startframe += FrameCount;
+
+ if (FrameCount < RequestedFrames && developer_insane.integer && vid_activewindow)
+ Con_DPrintf("SDL sound: %u sample frames missing\n", RequestedFrames - FrameCount);
+
+ sdlaudiotime += RequestedFrames;
+
+ SndSys_UnlockRenderBuffer();
+ }
}
/*
-==================
-S_UnblockSound
-==================
+====================
+SndSys_Init
+
+Create "snd_renderbuffer" with the proper sound format if the call is successful
+May return a suggested format if the requested format isn't available
+====================
*/
-void S_UnblockSound( void )
+qboolean SndSys_Init (const snd_format_t* requested, snd_format_t* suggested)
{
- snd_blocked--;
- if( snd_blocked == 0 )
- SDL_PauseAudio( false );
-}
-
+ unsigned int buffersize;
+ SDL_AudioSpec wantspec;
+ SDL_AudioSpec obtainspec;
-/*
-==================
-SNDDMA_Init
-
-Try to find a sound device to mix for.
-Returns false if nothing is found.
-==================
-*/
+ snd_threaded = false;
-qboolean SNDDMA_Init(void)
-{
- SDL_AudioSpec spec;
- int i;
+ Con_DPrint ("SndSys_Init: using the SDL module\n");
// Init the SDL Audio subsystem
if( SDL_InitSubSystem( SDL_INIT_AUDIO ) ) {
return false;
}
- // Init the shm structure
- memset( (void*) shm, 0, sizeof(*shm) );
-
- shm->format.channels = 2; //stereo
- shm->format.width = 2;
-
-// COMMANDLINEOPTION: SDL Sound: -sndspeed <hz> chooses 44100 hz, 22100 hz, or 11025 hz sound output rate
- i = COM_CheckParm( "-sndspeed" );
- if( i && i != ( com_argc - 1 ) )
- shm->format.speed = atoi( com_argv[ i+1 ] );
- else
- shm->format.speed = 44100;
-
- shm->samplepos = 0;
- shm->samples = AUDIO_SDL_SAMPLES * AUDIO_LOCALFACTOR;
- shm->bufferlength = shm->samples * shm->format.width;
- shm->buffer = Mem_Alloc( snd_mempool, shm->bufferlength );
-
- // Init the as structure
- as.buffer = shm->buffer;
- as.width = shm->format.width;
- as.pos = 0;
- as.size = shm->bufferlength;
+ buffersize = (unsigned int)ceil((double)requested->speed / 25.0); // 2048 bytes on 24kHz to 48kHz
// Init the SDL Audio subsystem
- spec.callback = Buffer_Callback;
- spec.channels = shm->format.channels;
- spec.format = AUDIO_S16SYS;
- spec.freq = shm->format.speed;
- spec.userdata = NULL;
- spec.samples = AUDIO_SDL_SAMPLES;
-
- if( SDL_OpenAudio( &spec, NULL ) ) {
- Con_Print( "Failed to open the audio device!\n" );
- Con_DPrintf(
- "Audio Specification:\n"
- "\tChannels : %i\n"
- "\tFormat : %x\n"
- "\tFrequency : %i\n"
- "\tBuffersize: %i Bytes(%i Samples)\n",
- spec.channels, spec.format, spec.freq, shm->bufferlength , spec.samples );
- Mem_Free( shm->buffer );
+ wantspec.callback = Buffer_Callback;
+ wantspec.userdata = NULL;
+ wantspec.freq = requested->speed;
+ wantspec.format = ((requested->width == 1) ? AUDIO_U8 : AUDIO_S16SYS);
+ wantspec.channels = requested->channels;
+ wantspec.samples = CeilPowerOf2(buffersize); // needs to be a power of 2 on some platforms.
+
+ Con_Printf("Wanted audio Specification:\n"
+ "\tChannels : %i\n"
+ "\tFormat : 0x%X\n"
+ "\tFrequency : %i\n"
+ "\tSamples : %i\n",
+ wantspec.channels, wantspec.format, wantspec.freq, wantspec.samples);
+
+ if( SDL_OpenAudio( &wantspec, &obtainspec ) )
+ {
+ Con_Printf( "Failed to open the audio device! (%s)\n", SDL_GetError() );
+ return false;
+ }
+
+ Con_Printf("Obtained audio specification:\n"
+ "\tChannels : %i\n"
+ "\tFormat : 0x%X\n"
+ "\tFrequency : %i\n"
+ "\tSamples : %i\n",
+ obtainspec.channels, obtainspec.format, obtainspec.freq, obtainspec.samples);
+
+ // If we haven't obtained what we wanted
+ if (wantspec.freq != obtainspec.freq ||
+ wantspec.format != obtainspec.format ||
+ wantspec.channels != obtainspec.channels)
+ {
+ SDL_CloseAudio();
+
+ // Pass the obtained format as a suggested format
+ if (suggested != NULL)
+ {
+ suggested->speed = obtainspec.freq;
+ // FIXME: check the format more carefully. There are plenty of unsupported cases
+ suggested->width = ((obtainspec.format == AUDIO_U8) ? 1 : 2);
+ suggested->channels = obtainspec.channels;
+ }
+
return false;
}
+ snd_threaded = true;
+
+ snd_renderbuffer = Snd_CreateRingBuffer(requested, 0, NULL);
+ if (snd_channellayout.integer == SND_CHANNELLAYOUT_AUTO)
+ Cvar_SetValueQuick (&snd_channellayout, SND_CHANNELLAYOUT_STANDARD);
+
+ sdlaudiotime = 0;
SDL_PauseAudio( false );
return true;
}
+
/*
-==============
-SNDDMA_GetDMAPos
+====================
+SndSys_Shutdown
-return the current sample position (in mono samples read)
-inside the recirculating dma buffer, so the mixing code will know
-how many sample are required to fill it up.
-===============
+Stop the sound card, delete "snd_renderbuffer" and free its other resources
+====================
*/
-int SNDDMA_GetDMAPos(void)
+void SndSys_Shutdown(void)
{
- shm->samplepos = (as.pos / as.width) % shm->samples;
- return shm->samplepos;
+ SDL_CloseAudio();
+
+ if (snd_renderbuffer != NULL)
+ {
+ Mem_Free(snd_renderbuffer->ring);
+ Mem_Free(snd_renderbuffer);
+ snd_renderbuffer = NULL;
+ }
}
+
/*
-==============
-SNDDMA_Submit
+====================
+SndSys_Submit
-Send sound to device if buffer isn't really the dma buffer
-===============
+Submit the contents of "snd_renderbuffer" to the sound card
+====================
*/
-void SNDDMA_Submit(void)
+void SndSys_Submit (void)
{
-
+ // Nothing to do here (this sound module is callback-based)
}
+
/*
-==============
-SNDDMA_Shutdown
+====================
+SndSys_GetSoundTime
-Reset the sound device for exiting
-===============
+Returns the number of sample frames consumed since the sound started
+====================
*/
-void SNDDMA_Shutdown(void)
+unsigned int SndSys_GetSoundTime (void)
{
- SDL_CloseAudio();
- Mem_Free( as.buffer );
+ return sdlaudiotime;
}
-void *S_LockBuffer(void)
+
+/*
+====================
+SndSys_LockRenderBuffer
+
+Get the exclusive lock on "snd_renderbuffer"
+====================
+*/
+qboolean SndSys_LockRenderBuffer (void)
{
SDL_LockAudio();
- return shm->buffer;
+ return true;
}
-void S_UnlockBuffer(void)
+
+/*
+====================
+SndSys_UnlockRenderBuffer
+
+Release the exclusive lock on "snd_renderbuffer"
+====================
+*/
+void SndSys_UnlockRenderBuffer (void)
{
SDL_UnlockAudio();
}
-static void Buffer_Callback(void *userdata, Uint8 *stream, int len)
+/*
+====================
+SndSys_SendKeyEvents
+
+Send keyboard events originating from the sound system (e.g. MIDI)
+====================
+*/
+void SndSys_SendKeyEvents(void)
{
- if( len > as.size )
- len = as.size;
- if( len > as.size - as.pos ) {
- memcpy( stream, (Uint8*) as.buffer + as.pos, as.size - as.pos );
- len -= as.size - as.pos;
- as.pos = 0;
- }
- memcpy( stream, (Uint8*) as.buffer + as.pos, len );
- as.pos = (as.pos + len) % as.size;
+ // not supported
}
-
projects / xonotic / darkplaces.git / blobdiff