diff options
Diffstat (limited to 'src/unix/sdl_snd.c')
| -rw-r--r-- | src/unix/sdl_snd.c | 363 |
1 files changed, 363 insertions, 0 deletions
diff --git a/src/unix/sdl_snd.c b/src/unix/sdl_snd.c new file mode 100644 index 0000000..8b0aaf0 --- /dev/null +++ b/src/unix/sdl_snd.c @@ -0,0 +1,363 @@ +#if USE_SDL_SOUND + +/* + * SDL implementation for Quake 3: Arena's GPL source release. + * + * This is a replacement of the Linux/OpenSoundSystem code with + * an SDL backend, since it allows us to trivially point just about any + * existing 2D audio backend known to man on any platform at the code, + * plus it benefits from all of SDL's tapdancing to support buggy drivers, + * etc, and gets us free ALSA support, too. + * + * This is the best idea for a direct modernization of the Linux sound code + * in Quake 3. However, it would be nice to replace this with true 3D + * positional audio, compliments of OpenAL... + * + * Written by Ryan C. Gordon (icculus@icculus.org). Please refer to + * http://ioquake3.org/ for the latest version of this code. + * + * Patches and comments are welcome at the above address. + * + * I cut-and-pasted this from linux_snd.c, and moved it to SDL line-by-line. + * There is probably some cruft that could be removed here. + * + * You should define USE_SDL=1 and then add this to the makefile. + * USE_SDL will disable the Open Sound System target. + */ + +/* +Original copyright on Q3A sources: +=========================================================================== +Copyright (C) 1999-2005 Id Software, Inc. +Copyright (C) 2000-2006 Tim Angus + +This file is part of Tremulous. + +Tremulous 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. + +Tremulous 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 Tremulous; if not, write to the Free Software +Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA +=========================================================================== +*/ + +#include <stdlib.h> +#include <stdio.h> + +#include "SDL.h" + +#include "../qcommon/q_shared.h" +#include "../client/snd_local.h" + +qboolean snd_inited = qfalse; + +cvar_t *s_sdlBits; +cvar_t *s_sdlSpeed; +cvar_t *s_sdlChannels; +cvar_t *s_sdlDevSamps; +cvar_t *s_sdlMixSamps; + +static qboolean use_custom_memset = qfalse; + +/* +=============== +Snd_Memset + +https://zerowing.idsoftware.com/bugzilla/show_bug.cgi?id=371 + +<TTimo> some shitty mess with DMA buffers +<TTimo> the mmap'ing permissions were write only +<TTimo> and glibc optimized for mmx would do memcpy with a prefetch and a read +<TTimo> causing segfaults +<TTimo> some other systems would not let you mmap the DMA with read permissions +<TTimo> so I think I ended up attempting opening with read/write, then try write only +<TTimo> and use my own copy instead of the glibc crap +=============== +*/ + +#ifdef Snd_Memset +#undef Snd_Memset +#endif +void Snd_Memset (void* dest, const int val, const size_t count) +{ + int *pDest; + int i, iterate; + + if (!use_custom_memset) + { + Com_Memset(dest,val,count); + return; + } + iterate = count / sizeof(int); + pDest = (int*)dest; + for(i=0; i<iterate; i++) + { + pDest[i] = val; + } +} + +/* The audio callback. All the magic happens here. */ +static int dmapos = 0; +static int dmasize = 0; + +/* +=============== +sdl_audio_callback +=============== +*/ +static void sdl_audio_callback(void *userdata, Uint8 *stream, int len) +{ + int pos = (dmapos * (dma.samplebits/8)); + if (pos >= dmasize) + dmapos = pos = 0; + + if (!snd_inited) /* shouldn't happen, but just in case... */ + { + memset(stream, '\0', len); + return; + } + else + { + int tobufend = dmasize - pos; /* bytes to buffer's end. */ + int len1 = len; + int len2 = 0; + + if (len1 > tobufend) + { + len1 = tobufend; + len2 = len - len1; + } + memcpy(stream, dma.buffer + pos, len1); + if (len2 <= 0) + dmapos += (len1 / (dma.samplebits/8)); + else /* wraparound? */ + { + memcpy(stream+len1, dma.buffer, len2); + dmapos = (len2 / (dma.samplebits/8)); + } + } + + if (dmapos >= dmasize) + dmapos = 0; +} + +static struct +{ + Uint16 enumFormat; + char *stringFormat; +} formatToStringTable[ ] = +{ + { AUDIO_U8, "AUDIO_U8" }, + { AUDIO_S8, "AUDIO_S8" }, + { AUDIO_U16LSB, "AUDIO_U16LSB" }, + { AUDIO_S16LSB, "AUDIO_S16LSB" }, + { AUDIO_U16MSB, "AUDIO_U16MSB" }, + { AUDIO_S16MSB, "AUDIO_S16MSB" } +}; + +static int formatToStringTableSize = + sizeof( formatToStringTable ) / sizeof( formatToStringTable[ 0 ] ); + +/* +=============== +print_audiospec +=============== +*/ +static void print_audiospec(const char *str, const SDL_AudioSpec *spec) +{ + int i; + char *fmt = NULL; + + Com_Printf("%s:\n", str); + + for( i = 0; i < formatToStringTableSize; i++ ) { + if( spec->format == formatToStringTable[ i ].enumFormat ) { + fmt = formatToStringTable[ i ].stringFormat; + } + } + + if( fmt ) { + Com_Printf( " Format: %s\n", fmt ); + } else { + Com_Printf( " Format: " S_COLOR_RED "UNKNOWN\n"); + } + + Com_Printf( " Freq: %d\n", (int) spec->freq ); + Com_Printf( " Samples: %d\n", (int) spec->samples ); + Com_Printf( " Channels: %d\n", (int) spec->channels ); +} + +/* +=============== +SNDDMA_Init +=============== +*/ +qboolean SNDDMA_Init(void) +{ + char drivername[128]; + SDL_AudioSpec desired; + SDL_AudioSpec obtained; + int tmp; + + if (snd_inited) + return qtrue; + + Com_Printf("Initializing SDL audio driver...\n"); + + if (!s_sdlBits) { + s_sdlBits = Cvar_Get("s_sdlBits", "16", CVAR_ARCHIVE); + s_sdlSpeed = Cvar_Get("s_sdlSpeed", "0", CVAR_ARCHIVE); + s_sdlChannels = Cvar_Get("s_sdlChannels", "2", CVAR_ARCHIVE); + s_sdlDevSamps = Cvar_Get("s_sdlDevSamps", "0", CVAR_ARCHIVE); + s_sdlMixSamps = Cvar_Get("s_sdlMixSamps", "0", CVAR_ARCHIVE); + } + + if (!SDL_WasInit(SDL_INIT_AUDIO)) + { + if (SDL_Init(SDL_INIT_AUDIO) == -1) + { + Com_Printf("SDL_Init(SDL_INIT_AUDIO) failed: %s\n", SDL_GetError()); + return qfalse; + } + } + + if (SDL_AudioDriverName(drivername, sizeof (drivername)) == NULL) + strcpy(drivername, "(UNKNOWN)"); + Com_Printf("SDL audio driver is \"%s\".\n", drivername); + + memset(&desired, '\0', sizeof (desired)); + memset(&obtained, '\0', sizeof (obtained)); + + tmp = ((int) s_sdlBits->value); + if ((tmp != 16) && (tmp != 8)) + tmp = 16; + + desired.freq = (int) s_sdlSpeed->value; + if(!desired.freq) desired.freq = 22050; + desired.format = ((tmp == 16) ? AUDIO_S16SYS : AUDIO_U8); + + // I dunno if this is the best idea, but I'll give it a try... + // should probably check a cvar for this... + if (s_sdlDevSamps->value) + desired.samples = s_sdlDevSamps->value; + else + { + // just pick a sane default. + if (desired.freq <= 11025) + desired.samples = 256; + else if (desired.freq <= 22050) + desired.samples = 512; + else if (desired.freq <= 44100) + desired.samples = 1024; + else + desired.samples = 2048; // (*shrug*) + } + + desired.channels = (int) s_sdlChannels->value; + desired.callback = sdl_audio_callback; + + if (SDL_OpenAudio(&desired, &obtained) == -1) + { + Com_Printf("SDL_OpenAudio() failed: %s\n", SDL_GetError()); + SDL_QuitSubSystem(SDL_INIT_AUDIO); + return qfalse; + } // if + + print_audiospec("SDL_AudioSpec", &obtained); + + // dma.samples needs to be big, or id's mixer will just refuse to + // work at all; we need to keep it significantly bigger than the + // amount of SDL callback samples, and just copy a little each time + // the callback runs. + // 32768 is what the OSS driver filled in here on my system. I don't + // know if it's a good value overall, but at least we know it's + // reasonable...this is why I let the user override. + tmp = s_sdlMixSamps->value; + if (!tmp) + tmp = (obtained.samples * obtained.channels) * 10; + + if (tmp & (tmp - 1)) // not a power of two? Seems to confuse something. + { + int val = 1; + while (val < tmp) + val <<= 1; + + tmp = val; + } + + dmapos = 0; + dma.samplebits = obtained.format & 0xFF; // first byte of format is bits. + dma.channels = obtained.channels; + dma.samples = tmp; + dma.submission_chunk = 1; + dma.speed = obtained.freq; + dmasize = (dma.samples * (dma.samplebits/8)); + dma.buffer = calloc(1, dmasize); + + Com_Printf("Starting SDL audio callback...\n"); + SDL_PauseAudio(0); // start callback. + + Com_Printf("SDL audio initialized.\n"); + snd_inited = qtrue; + return qtrue; +} + +/* +=============== +SNDDMA_GetDMAPos +=============== +*/ +int SNDDMA_GetDMAPos(void) +{ + return dmapos; +} + +/* +=============== +SNDDMA_Shutdown +=============== +*/ +void SNDDMA_Shutdown(void) +{ + Com_Printf("Closing SDL audio device...\n"); + SDL_PauseAudio(1); + SDL_CloseAudio(); + SDL_QuitSubSystem(SDL_INIT_AUDIO); + free(dma.buffer); + dma.buffer = NULL; + dmapos = dmasize = 0; + snd_inited = qfalse; + Com_Printf("SDL audio device shut down.\n"); +} + +/* +=============== +SNDDMA_Submit + +Send sound to device if buffer isn't really the dma buffer +=============== +*/ +void SNDDMA_Submit(void) +{ + SDL_UnlockAudio(); +} + +/* +=============== +SNDDMA_BeginPainting +=============== +*/ +void SNDDMA_BeginPainting (void) +{ + SDL_LockAudio(); +} + +#endif // USE_SDL_SOUND |