X-Git-Url: http://git.xonotic.org/?p=xonotic%2Fdarkplaces.git;a=blobdiff_plain;f=snd_sdl.c;h=e93d302113f31e5cb509faa5f5824c584ae21a1f;hp=b673dfa9a58b9c13ec71c1fe628418363f900570;hb=415f1e0e46791994cfa2f6dd3a29f793e3bb9cd9;hpb=426d3967446d906a9612ae09e6748d3dad26c60f diff --git a/snd_sdl.c b/snd_sdl.c index b673dfa9..e93d3021 100644 --- a/snd_sdl.c +++ b/snd_sdl.c @@ -16,191 +16,238 @@ 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 #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 -*/ +#include "darkplaces.h" +#include "vid.h" -#define AUDIO_SDL_SAMPLES 4096 -#define AUDIO_LOCALFACTOR 4 +#include "snd_main.h" -typedef struct AudioState_s -{ - int width; - int size; - int pos; - void *buffer; -} AudioState; +static unsigned int sdlaudiotime = 0; +static int audio_device = 0; -extern mempool_t *snd_mempool; -static AudioState as; -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); + + // As of SDL 2.0 buffer needs to be fully initialized, so fill leftover part with silence + // FIXME this is another place that assumes 8bit is always unsigned and others always signed + memset(&stream[PartialLength1 + PartialLength2], snd_renderbuffer->format.width == 1 ? 0x80 : 0, len - (PartialLength1 + PartialLength2)); + } + else + { + memcpy(stream, &snd_renderbuffer->ring[StartOffset * factor], FrameCount * factor); + + // As of SDL 2.0 buffer needs to be fully initialized, so fill leftover part with silence + // FIXME this is another place that assumes 8bit is always unsigned and others always signed + memset(&stream[FrameCount * factor], snd_renderbuffer->format.width == 1 ? 0x80 : 0, len - (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 ) +qbool SndSys_Init (snd_format_t* fmt) { - snd_blocked--; - if( snd_blocked == 0 ) - SDL_PauseAudio( false ); -} + unsigned int buffersize; + SDL_AudioSpec wantspec; + SDL_AudioSpec obtainspec; + snd_threaded = false; -/* -================== -SNDDMA_Init - -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 ) ) { - Con_SafePrint( "Initializing the SDL Audio subsystem failed!\n" ); + Con_Print( "Initializing the SDL Audio subsystem failed!\n" ); return false; } - // Init the shm structure - memset( (void*) shm, 0, sizeof(*shm) ); - - shm->format.channels = 2; //stereo - shm->format.width = 2; - -// COMMANDLINEOPTION: -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)fmt->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_S16LSB; - spec.freq = shm->format.speed; - spec.userdata = NULL; - spec.samples = AUDIO_SDL_SAMPLES; - - if( SDL_OpenAudio( &spec, NULL ) ) { - Con_SafePrint( "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 ); + memset(&wantspec, 0, sizeof(wantspec)); + wantspec.callback = Buffer_Callback; + wantspec.userdata = NULL; + wantspec.freq = fmt->speed; + wantspec.format = fmt->width == 1 ? AUDIO_U8 : (fmt->width == 2 ? AUDIO_S16SYS : AUDIO_F32); + wantspec.channels = fmt->channels; + wantspec.samples = CeilPowerOf2(buffersize); // needs to be a power of 2 on some platforms. + + Con_Printf("Wanted audio Specification:\n" + " Channels : %i\n" + " Format : 0x%X\n" + " Frequency : %i\n" + " Samples : %i\n", + wantspec.channels, wantspec.format, wantspec.freq, wantspec.samples); + + if ((audio_device = SDL_OpenAudioDevice(NULL, 0, &wantspec, &obtainspec, SDL_AUDIO_ALLOW_FREQUENCY_CHANGE | SDL_AUDIO_ALLOW_CHANNELS_CHANGE)) == 0) + { + Con_Printf(CON_ERROR "Failed to open the audio device! (%s)\n", SDL_GetError() ); return false; } - SDL_PauseAudio( false ); + Con_Printf("Obtained audio specification:\n" + " Channels : %i\n" + " Format : 0x%X\n" + " Frequency : %i\n" + " Samples : %i\n", + obtainspec.channels, obtainspec.format, obtainspec.freq, obtainspec.samples); + + fmt->speed = obtainspec.freq; + fmt->channels = obtainspec.channels; + + snd_threaded = true; + + snd_renderbuffer = Snd_CreateRingBuffer(fmt, 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" +==================== +*/ +qbool 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 } -