X-Git-Url: http://de.git.xonotic.org/?p=xonotic%2Fdarkplaces.git;a=blobdiff_plain;f=snd_sdl.c;h=21341dce883a6c111b502a2a91113ce9a13b99e8;hp=38fb20531a896af68c3432414e07191e7e6b1c56;hb=2075ae43356d724bae305ce8fd36ea570718b14a;hpb=2896002f090d9e2d57b8eca46cccb8362b95459c diff --git a/snd_sdl.c b/snd_sdl.c index 38fb2053..21341dce 100644 --- a/snd_sdl.c +++ b/snd_sdl.c @@ -16,74 +16,91 @@ You should have received a copy of the GNU General Public License 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 #include -/* -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" -extern mempool_t *snd_mempool; -static AudioState as; +static unsigned int sdlaudiotime = 0; +static int audio_device = 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 + snd_threaded = false; -Try to find a sound device to mix for. -Returns false if nothing is found. -================== -*/ - -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 ) ) { @@ -91,117 +108,150 @@ qboolean SNDDMA_Init(void) 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 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 ((audio_device = SDL_OpenAudioDevice(NULL, 0, &wantspec, &obtainspec, 0)) == 0) + { + 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_CloseAudioDevice(audio_device); + + // 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; } - SDL_PauseAudio( 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_PauseAudioDevice(audio_device, 0); 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; + if (audio_device > 0) { + SDL_CloseAudioDevice(audio_device); + audio_device = 0; + } + 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; + SDL_LockAudioDevice(audio_device); + return true; } -void S_UnlockBuffer(void) + +/* +==================== +SndSys_UnlockRenderBuffer + +Release the exclusive lock on "snd_renderbuffer" +==================== +*/ +void SndSys_UnlockRenderBuffer (void) { - SDL_UnlockAudio(); + SDL_UnlockAudioDevice(audio_device); } -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 } -