--- /dev/null
+/*
+Copyright (C) 2004 Andreas Kirsch
+
+This program is free software; you can redistribute it and/or
+modify it under the terms of the GNU General Public License
+as published by the Free Software Foundation; either version 2
+of the License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+See the GNU General Public License for more details.
+
+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 <math.h>
+#include <SDL.h>
+
+#include "snd_main.h"
+
+
+static unsigned int sdlaudiotime = 0;
+
+
+// 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)
+{
+ 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();
+ }
+}
+
+
+/*
+====================
+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
+====================
+*/
+qboolean SndSys_Init (const snd_format_t* requested, snd_format_t* suggested)
+{
+ unsigned int buffersize;
+ SDL_AudioSpec wantspec;
+ SDL_AudioSpec obtainspec;
+
+ snd_threaded = false;
+
+ Con_DPrint ("SndSys_Init: using the SDL module\n");
+
+ // Init the SDL Audio subsystem
+ if( SDL_InitSubSystem( SDL_INIT_AUDIO ) ) {
+ Con_Print( "Initializing the SDL Audio subsystem failed!\n" );
+ return false;
+ }
+
+ buffersize = (unsigned int)ceil((double)requested->speed / 25.0); // 2048 bytes on 24kHz to 48kHz
+
+ // Init the SDL Audio subsystem
+ 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;
+}
+
+
+/*
+====================
+SndSys_Shutdown
+
+Stop the sound card, delete "snd_renderbuffer" and free its other resources
+====================
+*/
+void SndSys_Shutdown(void)
+{
+ SDL_CloseAudio();
+
+ if (snd_renderbuffer != NULL)
+ {
+ Mem_Free(snd_renderbuffer->ring);
+ Mem_Free(snd_renderbuffer);
+ snd_renderbuffer = NULL;
+ }
+}
+
+
+/*
+====================
+SndSys_Submit
+
+Submit the contents of "snd_renderbuffer" to the sound card
+====================
+*/
+void SndSys_Submit (void)
+{
+ // Nothing to do here (this sound module is callback-based)
+}
+
+
+/*
+====================
+SndSys_GetSoundTime
+
+Returns the number of sample frames consumed since the sound started
+====================
+*/
+unsigned int SndSys_GetSoundTime (void)
+{
+ return sdlaudiotime;
+}
+
+
+/*
+====================
+SndSys_LockRenderBuffer
+
+Get the exclusive lock on "snd_renderbuffer"
+====================
+*/
+qboolean SndSys_LockRenderBuffer (void)
+{
+ SDL_LockAudio();
+ return true;
+}
+
+
+/*
+====================
+SndSys_UnlockRenderBuffer
+
+Release the exclusive lock on "snd_renderbuffer"
+====================
+*/
+void SndSys_UnlockRenderBuffer (void)
+{
+ SDL_UnlockAudio();
+}
+
+/*
+====================
+SndSys_SendKeyEvents
+
+Send keyboard events originating from the sound system (e.g. MIDI)
+====================
+*/
+void SndSys_SendKeyEvents(void)
+{
+ // not supported
+}
projects / voretournament / voretournament.git / blobdiff