2 Copyright (C) 1996-1997 Id Software, Inc.
4 This program is free software; you can redistribute it and/or
5 modify it under the terms of the GNU General Public License
6 as published by the Free Software Foundation; either version 2
7 of the License, or (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
13 See the GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
27 typedef struct snd_format_s
31 unsigned short channels;
34 typedef struct snd_buffer_s
37 unsigned int nbframes; // current size, in sample frames
38 unsigned int maxframes; // max size (buffer size), in sample frames
39 unsigned char samples[4]; // variable sized
42 typedef struct snd_ringbuffer_s
46 unsigned int maxframes; // max size (buffer size), in sample frames
47 unsigned int startframe; // index of the first frame in the buffer
48 // if startframe == endframe, the bufffer is empty
49 unsigned int endframe; // index of the first EMPTY frame in the "ring" buffer
50 // may be smaller than startframe if the "ring" buffer has wrapped
54 #define SFXFLAG_NONE 0
55 #define SFXFLAG_FILEMISSING (1 << 0) // wasn't able to load the associated sound file
56 #define SFXFLAG_SERVERSOUND (1 << 1) // the sfx is part of the server precache list
57 #define SFXFLAG_STREAMED (1 << 2) // informative only. You shouldn't need to know that
58 #define SFXFLAG_PERMANENTLOCK (1 << 3) // can never be freed (ex: used by the client code)
60 typedef struct snd_fetcher_s snd_fetcher_t;
65 size_t memsize; // total memory used (including sfx_t and fetcher data)
67 // One lock is automatically granted while the sfx is
68 // playing (and removed when stopped). Locks can also be
69 int locks; // added by S_PrecacheSound and S_ServerSounds.
70 // A SFX with no lock and no SFXFLAG_PERMANENTLOCK is
71 // freed at level change by S_ServerSounds.
73 unsigned int flags; // cf SFXFLAG_* defines
74 int loopstart; // in sample frames. -1 if not looped
75 unsigned int total_length; // in sample frames
76 const snd_fetcher_t *fetcher;
77 void *fetcher_data; // Per-sfx data for the sound fetching functions
80 // maximum supported speakers constant
81 #define SND_LISTENERS 8
83 typedef struct channel_s
85 short listener_volume [SND_LISTENERS]; // 0-255 volume per speaker
86 int master_vol; // 0-255 master volume
87 sfx_t *sfx; // sfx number
88 unsigned int flags; // cf CHANNELFLAG_* defines
89 unsigned int end; // end time in global paintsamples
90 unsigned int lastptime; // last time this channel was painted
91 unsigned int pos; // sample position in sfx
92 int entnum; // to allow overriding a specific sound
94 vec3_t origin; // origin of sound effect
95 vec_t dist_mult; // distance multiplier (attenuation/clipK)
96 void *fetcher_data; // Per-channel data for the sound fetching function
99 // Sound fetching functions
100 // "start" is both an input and output parameter: it returns the actual start time of the sound buffer
101 typedef const snd_buffer_t* (*snd_fetcher_getsb_t) (channel_t* ch, unsigned int *start, unsigned int nbsampleframes);
102 typedef void (*snd_fetcher_endsb_t) (channel_t* ch);
103 typedef void (*snd_fetcher_free_t) (sfx_t* sfx);
104 typedef const snd_format_t* (*snd_fetcher_getfmt_t) (sfx_t* sfx);
107 snd_fetcher_getsb_t getsb;
108 snd_fetcher_endsb_t endsb;
109 snd_fetcher_free_t free;
110 snd_fetcher_getfmt_t getfmt;
113 // 0 to NUM_AMBIENTS - 1 = water, etc
114 // NUM_AMBIENTS to NUM_AMBIENTS + MAX_DYNAMIC_CHANNELS - 1 = normal entity sounds
115 // NUM_AMBIENTS + MAX_DYNAMIC_CHANNELS to total_channels = static sounds
116 #define MAX_DYNAMIC_CHANNELS 128
117 #define MAX_CHANNELS 516
119 extern unsigned int total_channels;
120 extern channel_t channels[MAX_CHANNELS];
122 extern snd_ringbuffer_t *snd_renderbuffer;
123 extern unsigned int soundtime; // WARNING: sound modules must NOT use it
125 extern cvar_t _snd_mixahead;
126 extern cvar_t snd_swapstereo;
127 extern cvar_t snd_streaming;
129 extern int snd_blocked; // counter. When > 0, we stop submitting sound to the audio device
131 extern mempool_t *snd_mempool;
133 // If simsound is true, the sound card is not initialized and no sound is submitted to it.
134 // More generally, all arch-dependent operations are skipped or emulated.
135 // Used for isolating performance in the renderer.
136 extern qboolean simsound;
138 extern qboolean alsaspeakerlayout;
141 // ====================================================================
142 // Architecture-independent functions
143 // ====================================================================
145 void S_PaintChannels (snd_ringbuffer_t* rb, unsigned int starttime, unsigned int endtime);
147 qboolean S_LoadSound (sfx_t *sfx, qboolean complain);
149 void S_LockSfx (sfx_t *sfx);
150 void S_UnlockSfx (sfx_t *sfx);
152 snd_buffer_t *Snd_CreateSndBuffer (const unsigned char *samples, unsigned int sampleframes, const snd_format_t* in_format, unsigned int sb_speed);
153 qboolean Snd_AppendToSndBuffer (snd_buffer_t* sb, const unsigned char *samples, unsigned int sampleframes, const snd_format_t* format);
155 // If "buffer" is NULL, the function allocates one buffer of "sampleframes" sample frames itself
156 // (if "sampleframes" is 0, the function chooses the size).
157 snd_ringbuffer_t *Snd_CreateRingBuffer (const snd_format_t* format, unsigned int sampleframes, void* buffer);
160 // ====================================================================
161 // Architecture-dependent functions
162 // ====================================================================
164 // Create "snd_renderbuffer" with the proper sound format if the call is successful
165 // May return a suggested format if the requested format isn't available
166 qboolean SndSys_Init (const snd_format_t* requested, snd_format_t* suggested);
168 // Stop the sound card, delete "snd_renderbuffer" and free its other resources
169 void SndSys_Shutdown (void);
171 // Submit the contents of "snd_renderbuffer" to the sound card
172 void SndSys_Submit (void);
174 // Returns the number of sample frames consumed since the sound started
175 unsigned int SndSys_GetSoundTime (void);
177 // Get the exclusive lock on "snd_renderbuffer"
178 qboolean SndSys_LockRenderBuffer (void);
180 // Release the exclusive lock on "snd_renderbuffer"
181 void SndSys_UnlockRenderBuffer (void);