--- /dev/null
+/*
+Copyright (C) 1996-1997 Id Software, Inc.
+
+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.
+
+*/
+
+#ifndef SND_MAIN_H
+#define SND_MAIN_H
+
+#include "sound.h"
+
+
+typedef struct snd_format_s
+{
+ unsigned int speed;
+ unsigned short width;
+ unsigned short channels;
+} snd_format_t;
+
+typedef struct snd_buffer_s
+{
+ snd_format_t format;
+ unsigned int nbframes; // current size, in sample frames
+ unsigned int maxframes; // max size (buffer size), in sample frames
+ unsigned char samples[4]; // variable sized
+} snd_buffer_t;
+
+typedef struct snd_ringbuffer_s
+{
+ snd_format_t format;
+ unsigned char* ring;
+ unsigned int maxframes; // max size (buffer size), in sample frames
+ unsigned int startframe; // index of the first frame in the buffer
+ // if startframe == endframe, the bufffer is empty
+ unsigned int endframe; // index of the first EMPTY frame in the "ring" buffer
+ // may be smaller than startframe if the "ring" buffer has wrapped
+} snd_ringbuffer_t;
+
+// sfx_t flags
+#define SFXFLAG_NONE 0
+#define SFXFLAG_FILEMISSING (1 << 0) // wasn't able to load the associated sound file
+#define SFXFLAG_LEVELSOUND (1 << 1) // the sfx is part of the server or client precache list for this level
+#define SFXFLAG_STREAMED (1 << 2) // informative only. You shouldn't need to know that
+#define SFXFLAG_MENUSOUND (1 << 3) // not freed during level change (menu sounds, music, etc)
+
+typedef struct snd_fetcher_s snd_fetcher_t;
+struct sfx_s
+{
+ char name[MAX_QPATH];
+ sfx_t *next;
+ size_t memsize; // total memory used (including sfx_t and fetcher data)
+
+ unsigned int flags; // cf SFXFLAG_* defines
+ unsigned int loopstart; // in sample frames. equals total_length if not looped
+ unsigned int total_length; // in sample frames
+ const snd_fetcher_t *fetcher;
+ void *fetcher_data; // Per-sfx data for the sound fetching functions
+
+ float volume_mult; // for replay gain (multiplier to apply)
+ float volume_peak; // for replay gain (highest peak); if set to 0, ReplayGain isn't supported
+};
+
+// maximum supported speakers constant
+#define SND_LISTENERS 8
+
+typedef struct channel_s
+{
+ int listener_volume [SND_LISTENERS]; // 0-65536 volume per speaker
+ int master_vol; // 0-65536 master volume
+ sfx_t *sfx; // pointer to sound sample being used
+ unsigned int flags; // cf CHANNELFLAG_* defines
+ int pos; // sample position in sfx, negative values delay the start of the sound playback
+ int entnum; // to allow overriding a specific sound
+ int entchannel;
+ vec3_t origin; // origin of sound effect
+ vec_t dist_mult; // distance multiplier (attenuation/clipK)
+ void *fetcher_data; // Per-channel data for the sound fetching function
+ int prologic_invert;// whether a sound is played on the surround channels in prologic
+} channel_t;
+
+// Sound fetching functions
+// "start" is both an input and output parameter: it returns the actual start time of the sound buffer
+typedef const snd_buffer_t* (*snd_fetcher_getsb_t) (void *sfxfetcher, void **chfetcherpointer, unsigned int *start, unsigned int nbsampleframes);
+typedef void (*snd_fetcher_endsb_t) (void *chfetcherdata);
+typedef void (*snd_fetcher_free_t) (void *sfxfetcherdata);
+typedef const snd_format_t* (*snd_fetcher_getfmt_t) (sfx_t* sfx);
+struct snd_fetcher_s
+{
+ snd_fetcher_getsb_t getsb;
+ snd_fetcher_endsb_t endsb;
+ snd_fetcher_free_t free;
+ snd_fetcher_getfmt_t getfmt;
+};
+
+extern unsigned int total_channels;
+extern channel_t channels[MAX_CHANNELS];
+
+extern snd_ringbuffer_t *snd_renderbuffer;
+extern qboolean snd_threaded; // enables use of snd_usethreadedmixing, provided that no sound hacks are in effect (like timedemo)
+extern qboolean snd_usethreadedmixing; // if true, the main thread does not mix sound, soundtime does not advance, and neither does snd_renderbuffer->endframe, instead the audio thread will call S_MixToBuffer as needed
+
+extern cvar_t _snd_mixahead;
+extern cvar_t snd_swapstereo;
+extern cvar_t snd_streaming;
+
+#define SND_CHANNELLAYOUT_AUTO 0
+#define SND_CHANNELLAYOUT_STANDARD 1
+#define SND_CHANNELLAYOUT_ALSA 2
+extern cvar_t snd_channellayout;
+
+extern int snd_blocked; // counter. When > 0, we stop submitting sound to the audio device
+
+extern mempool_t *snd_mempool;
+
+// If simsound is true, the sound card is not initialized and no sound is submitted to it.
+// More generally, all arch-dependent operations are skipped or emulated.
+// Used for isolating performance in the renderer.
+extern qboolean simsound;
+
+
+#define STREAM_BUFFER_DURATION 0.3f // in seconds
+#define STREAM_BUFFER_FILL 0.2f // in seconds
+#define STREAM_BUFFER_SIZE(format_ptr) ((int)ceil (STREAM_BUFFER_DURATION * (format_ptr)->speed) * (format_ptr)->width * (format_ptr)->channels)
+
+// We work with 1 sec sequences, so this buffer must be able to contain
+// 1 sec of sound of the highest quality (48 KHz, 16 bit samples, stereo)
+extern unsigned char resampling_buffer [48000 * 2 * 2];
+
+
+// ====================================================================
+// Architecture-independent functions
+// ====================================================================
+
+void S_MixToBuffer(void *stream, unsigned int frames);
+
+qboolean S_LoadSound (sfx_t *sfx, qboolean complain);
+
+snd_buffer_t *Snd_CreateSndBuffer (const unsigned char *samples, unsigned int sampleframes, const snd_format_t* in_format, unsigned int sb_speed);
+qboolean Snd_AppendToSndBuffer (snd_buffer_t* sb, const unsigned char *samples, unsigned int sampleframes, const snd_format_t* format);
+
+// If "buffer" is NULL, the function allocates one buffer of "sampleframes" sample frames itself
+// (if "sampleframes" is 0, the function chooses the size).
+snd_ringbuffer_t *Snd_CreateRingBuffer (const snd_format_t* format, unsigned int sampleframes, void* buffer);
+
+
+// ====================================================================
+// Architecture-dependent functions
+// ====================================================================
+
+// 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);
+
+// Stop the sound card, delete "snd_renderbuffer" and free its other resources
+void SndSys_Shutdown (void);
+
+// Submit the contents of "snd_renderbuffer" to the sound card
+void SndSys_Submit (void);
+
+// Returns the number of sample frames consumed since the sound started
+unsigned int SndSys_GetSoundTime (void);
+
+// Get the exclusive lock on "snd_renderbuffer"
+qboolean SndSys_LockRenderBuffer (void);
+
+// Release the exclusive lock on "snd_renderbuffer"
+void SndSys_UnlockRenderBuffer (void);
+
+// if the sound system can generate events, send them
+void SndSys_SendKeyEvents(void);
+
+// exported for capturevideo so ogg can see all channels
+typedef struct portable_samplepair_s
+{
+ int sample[SND_LISTENERS];
+} portable_sampleframe_t;
+
+typedef struct listener_s
+{
+ int channel_unswapped; // for un-swapping
+ float yawangle;
+ float dotscale;
+ float dotbias;
+ float ambientvolume;
+}
+listener_t;
+typedef struct speakerlayout_s
+{
+ const char *name;
+ unsigned int channels;
+ listener_t listeners[SND_LISTENERS];
+}
+speakerlayout_t;
+
+#endif