author | Ryan C. Gordon <icculus@icculus.org> |
Tue, 17 Oct 2006 09:15:21 +0000 | |
changeset 2049 | 5f6550e5184f |
parent 1985 | 8055185ae4ed |
child 2655 | b8e736c8a5a8 |
child 2720 | 4eb759edddf5 |
permissions | -rw-r--r-- |
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/* |
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SDL - Simple DirectMedia Layer |
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Copyright (C) 1997-2006 Sam Lantinga |
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This library is free software; you can redistribute it and/or |
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modify it under the terms of the GNU Lesser General Public |
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License as published by the Free Software Foundation; either |
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version 2.1 of the License, or (at your option) any later version. |
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This library is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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Lesser General Public License for more details. |
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You should have received a copy of the GNU Lesser General Public |
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License along with this library; if not, write to the Free Software |
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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Sam Lantinga |
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slouken@libsdl.org |
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*/ |
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/** |
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* \file SDL_audio.h |
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* |
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* Access to the raw audio mixing buffer for the SDL library |
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*/ |
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#ifndef _SDL_audio_h |
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#define _SDL_audio_h |
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#include "SDL_stdinc.h" |
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#include "SDL_error.h" |
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#include "SDL_endian.h" |
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#include "SDL_mutex.h" |
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#include "SDL_thread.h" |
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#include "SDL_rwops.h" |
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#include "begin_code.h" |
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/* Set up for C function definitions, even when using C++ */ |
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#ifdef __cplusplus |
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/* *INDENT-OFF* */ |
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extern "C" { |
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/* *INDENT-ON* */ |
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#endif |
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typedef Uint16 SDL_AudioFormat; |
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/* The calculated values in this structure are calculated by SDL_OpenAudio() */ |
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typedef struct SDL_AudioSpec |
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{ |
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int freq; /* DSP frequency -- samples per second */ |
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SDL_AudioFormat format; /* Audio data format */ |
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Uint8 channels; /* Number of channels: 1 mono, 2 stereo */ |
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Uint8 silence; /* Audio buffer silence value (calculated) */ |
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Uint16 samples; /* Audio buffer size in samples (power of 2) */ |
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Uint16 padding; /* Necessary for some compile environments */ |
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Uint32 size; /* Audio buffer size in bytes (calculated) */ |
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/* This function is called when the audio device needs more data. |
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'stream' is a pointer to the audio data buffer |
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'len' is the length of that buffer in bytes. |
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Once the callback returns, the buffer will no longer be valid. |
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Stereo samples are stored in a LRLRLR ordering. |
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*/ |
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void (SDLCALL * callback) (void *userdata, Uint8 * stream, int len); |
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void *userdata; |
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} SDL_AudioSpec; |
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/* |
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These are what the 16 bits in SDL_AudioFormat currently mean... |
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(Unspecified bits are always zero.) |
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++-----------------------sample is signed if set |
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|| |
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|| ++-----------sample is bigendian if set |
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|| || ++---sample is float if set |
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|| || || +---sample bit size---+ |
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15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00 |
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There are macros in SDL 1.3 and later to query these bits. |
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*/ |
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#define SDL_AUDIO_MASK_BITSIZE (0xFF) |
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#define SDL_AUDIO_MASK_DATATYPE (1<<8) |
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#define SDL_AUDIO_MASK_ENDIAN (1<<12) |
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#define SDL_AUDIO_MASK_SIGNED (1<<15) |
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#define SDL_AUDIO_BITSIZE(x) (x & SDL_AUDIO_MASK_BITSIZE) |
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#define SDL_AUDIO_ISFLOAT(x) (x & SDL_AUDIO_MASK_DATATYPE) |
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#define SDL_AUDIO_ISBIGENDIAN(x) (x & SDL_AUDIO_MASK_ENDIAN) |
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#define SDL_AUDIO_ISSIGNED(x) (x & SDL_AUDIO_MASK_SIGNED) |
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#define SDL_AUDIO_ISINT(x) (!SDL_AUDIO_ISFLOAT(x)) |
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#define SDL_AUDIO_ISLITTLEENDIAN(x) (!SDL_AUDIO_ISBIGENDIAN(x)) |
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#define SDL_AUDIO_ISUNSIGNED(x) (!SDL_AUDIO_ISSIGNED(x)) |
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/* Audio format flags (defaults to LSB byte order) */ |
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#define AUDIO_U8 0x0008 /* Unsigned 8-bit samples */ |
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#define AUDIO_S8 0x8008 /* Signed 8-bit samples */ |
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#define AUDIO_U16LSB 0x0010 /* Unsigned 16-bit samples */ |
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#define AUDIO_S16LSB 0x8010 /* Signed 16-bit samples */ |
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#define AUDIO_U16MSB 0x1010 /* As above, but big-endian byte order */ |
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#define AUDIO_S16MSB 0x9010 /* As above, but big-endian byte order */ |
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#define AUDIO_U16 AUDIO_U16LSB |
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#define AUDIO_S16 AUDIO_S16LSB |
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/* int32 support new to SDL 1.3 */ |
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#define AUDIO_S32LSB 0x8020 /* 32-bit integer samples */ |
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#define AUDIO_S32MSB 0x9020 /* As above, but big-endian byte order */ |
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#define AUDIO_S32 AUDIO_S32LSB |
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/* float32 support new to SDL 1.3 */ |
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#define AUDIO_F32LSB 0x8120 /* 32-bit floating point samples */ |
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#define AUDIO_F32MSB 0x9120 /* As above, but big-endian byte order */ |
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#define AUDIO_F32 AUDIO_F32LSB |
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/* Native audio byte ordering */ |
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#if SDL_BYTEORDER == SDL_LIL_ENDIAN |
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#define AUDIO_U16SYS AUDIO_U16LSB |
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#define AUDIO_S16SYS AUDIO_S16LSB |
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#define AUDIO_S32SYS AUDIO_S32LSB |
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#define AUDIO_F32SYS AUDIO_F32LSB |
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#else |
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#define AUDIO_U16SYS AUDIO_U16MSB |
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#define AUDIO_S16SYS AUDIO_S16MSB |
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#define AUDIO_S32SYS AUDIO_S32MSB |
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#define AUDIO_F32SYS AUDIO_F32MSB |
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#endif |
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/* A structure to hold a set of audio conversion filters and buffers */ |
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1983
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134 |
struct SDL_AudioCVT; |
1985
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Added source color and alpha modulation support.
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135 |
typedef void (SDLCALL * SDL_AudioFilter) (struct SDL_AudioCVT * cvt, |
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136 |
SDL_AudioFormat format); |
1983
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137 |
|
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typedef struct SDL_AudioCVT |
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{ |
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int needed; /* Set to 1 if conversion possible */ |
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141 |
SDL_AudioFormat src_format; /* Source audio format */ |
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SDL_AudioFormat dst_format; /* Target audio format */ |
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double rate_incr; /* Rate conversion increment */ |
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Uint8 *buf; /* Buffer to hold entire audio data */ |
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int len; /* Length of original audio buffer */ |
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146 |
int len_cvt; /* Length of converted audio buffer */ |
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|
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int len_mult; /* buffer must be len*len_mult big */ |
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double len_ratio; /* Given len, final size is len*len_ratio */ |
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SDL_AudioFilter filters[10]; /* Filter list */ |
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int filter_index; /* Current audio conversion function */ |
0 | 151 |
} SDL_AudioCVT; |
152 |
||
153 |
||
154 |
/* Function prototypes */ |
|
155 |
||
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|
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/* These functions return the list of built in audio drivers, in the |
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* order that they are normally initialized by default. |
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*/ |
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extern DECLSPEC int SDLCALL SDL_GetNumAudioDrivers(void); |
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extern DECLSPEC const char *SDLCALL SDL_GetAudioDriver(int index); |
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|
0 | 162 |
/* These functions are used internally, and should not be used unless you |
163 |
* have a specific need to specify the audio driver you want to use. |
|
164 |
* You should normally use SDL_Init() or SDL_InitSubSystem(). |
|
165 |
*/ |
|
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extern DECLSPEC int SDLCALL SDL_AudioInit(const char *driver_name); |
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extern DECLSPEC void SDLCALL SDL_AudioQuit(void); |
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/* This function returns the name of the current audio driver, or NULL |
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* if no driver has been initialized. |
0 | 171 |
*/ |
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extern DECLSPEC const char *SDLCALL SDL_GetCurrentAudioDriver(void); |
0 | 173 |
|
174 |
/* |
|
175 |
* This function opens the audio device with the desired parameters, and |
|
176 |
* returns 0 if successful, placing the actual hardware parameters in the |
|
177 |
* structure pointed to by 'obtained'. If 'obtained' is NULL, the audio |
|
178 |
* data passed to the callback function will be guaranteed to be in the |
|
179 |
* requested format, and will be automatically converted to the hardware |
|
180 |
* audio format if necessary. This function returns -1 if it failed |
|
181 |
* to open the audio device, or couldn't set up the audio thread. |
|
182 |
* |
|
183 |
* When filling in the desired audio spec structure, |
|
184 |
* 'desired->freq' should be the desired audio frequency in samples-per-second. |
|
185 |
* 'desired->format' should be the desired audio format. |
|
186 |
* 'desired->samples' is the desired size of the audio buffer, in samples. |
|
187 |
* This number should be a power of two, and may be adjusted by the audio |
|
188 |
* driver to a value more suitable for the hardware. Good values seem to |
|
189 |
* range between 512 and 8096 inclusive, depending on the application and |
|
190 |
* CPU speed. Smaller values yield faster response time, but can lead |
|
191 |
* to underflow if the application is doing heavy processing and cannot |
|
192 |
* fill the audio buffer in time. A stereo sample consists of both right |
|
193 |
* and left channels in LR ordering. |
|
194 |
* Note that the number of samples is directly related to time by the |
|
195 |
* following formula: ms = (samples*1000)/freq |
|
196 |
* 'desired->size' is the size in bytes of the audio buffer, and is |
|
197 |
* calculated by SDL_OpenAudio(). |
|
198 |
* 'desired->silence' is the value used to set the buffer to silence, |
|
199 |
* and is calculated by SDL_OpenAudio(). |
|
200 |
* 'desired->callback' should be set to a function that will be called |
|
201 |
* when the audio device is ready for more data. It is passed a pointer |
|
202 |
* to the audio buffer, and the length in bytes of the audio buffer. |
|
203 |
* This function usually runs in a separate thread, and so you should |
|
204 |
* protect data structures that it accesses by calling SDL_LockAudio() |
|
205 |
* and SDL_UnlockAudio() in your code. |
|
206 |
* 'desired->userdata' is passed as the first parameter to your callback |
|
207 |
* function. |
|
208 |
* |
|
209 |
* The audio device starts out playing silence when it's opened, and should |
|
210 |
* be enabled for playing by calling SDL_PauseAudio(0) when you are ready |
|
211 |
* for your audio callback function to be called. Since the audio driver |
|
212 |
* may modify the requested size of the audio buffer, you should allocate |
|
213 |
* any local mixing buffers after you open the audio device. |
|
214 |
*/ |
|
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215 |
extern DECLSPEC int SDLCALL SDL_OpenAudio(const SDL_AudioSpec * desired, |
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SDL_AudioSpec * obtained); |
0 | 217 |
|
218 |
/* |
|
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* SDL Audio Device IDs. |
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* A successful call to SDL_OpenAudio() is always device id 1, and legacy |
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* SDL audio APIs assume you want this device ID. SDL_OpenAudioDevice() calls |
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* always returns devices >= 2 on success. The legacy calls are good both |
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* for backwards compatibility and when you don't care about multiple, |
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* specific, or capture devices. |
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*/ |
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typedef Uint32 SDL_AudioDeviceID; |
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|
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/* |
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* Get the number of available devices exposed by the current driver. |
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* Only valid after a successfully initializing the audio subsystem. |
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231 |
* Returns -1 if an explicit list of devices can't be determined; this is |
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|
232 |
* not an error. For example, if SDL is set up to talk to a remote audio |
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|
233 |
* server, it can't list every one available on the Internet, but it will |
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|
234 |
* still allow a specific host to be specified to SDL_OpenAudioDevice(). |
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|
235 |
* In many common cases, when this function returns a value <= 0, it can still |
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|
236 |
* successfully open the default device (NULL for first argument of |
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|
237 |
* SDL_OpenAudioDevice()). |
1964
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238 |
*/ |
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|
239 |
extern DECLSPEC int SDLCALL SDL_GetNumAudioDevices(int iscapture); |
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240 |
|
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/* |
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|
242 |
* Get the human-readable name of a specific audio device. |
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|
243 |
* Must be a value between 0 and (number of audio devices-1). |
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244 |
* Only valid after a successfully initializing the audio subsystem. |
2049
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|
245 |
* The values returned by this function reflect the latest call to |
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|
246 |
* SDL_GetNumAudioDevices(); recall that function to redetect available |
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|
247 |
* hardware. |
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|
248 |
* |
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|
249 |
* The string returned by this function is UTF-8 encoded, read-only, and |
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|
250 |
* managed internally. You are not to free it. If you need to keep the |
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|
251 |
* string for any length of time, you should make your own copy of it, as it |
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|
252 |
* will be invalid next time any of several other SDL functions is called. |
1964
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|
253 |
*/ |
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|
254 |
extern DECLSPEC const char *SDLCALL SDL_GetAudioDeviceName(int index, |
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|
255 |
int iscapture); |
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|
256 |
|
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|
257 |
|
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|
258 |
/* |
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|
259 |
* Open a specific audio device. Passing in a device name of NULL requests |
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|
260 |
* the most reasonable default (and is equivalent to calling SDL_OpenAudio()). |
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|
261 |
* The device name is a UTF-8 string reported by SDL_GetAudioDevice(), but |
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Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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|
262 |
* some drivers allow arbitrary and driver-specific strings, such as a |
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Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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|
263 |
* hostname/IP address for a remote audio server, or a filename in the |
5f6550e5184f
Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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|
264 |
* diskaudio driver. |
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|
265 |
* Returns 0 on error, a valid device ID that is >= 2 on success. |
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|
266 |
* SDL_OpenAudio(), unlike this function, always acts on device ID 1. |
1964
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|
267 |
*/ |
1967
01e29c3e9a29
In general, fill in pointers to structures, rather than return them.
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|
268 |
extern DECLSPEC SDL_AudioDeviceID SDLCALL SDL_OpenAudioDevice(const char |
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In general, fill in pointers to structures, rather than return them.
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|
269 |
*device, |
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|
270 |
int iscapture, |
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271 |
const |
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|
272 |
SDL_AudioSpec * |
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273 |
desired, |
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|
274 |
SDL_AudioSpec * |
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|
275 |
obtained); |
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|
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|
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|
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279 |
/* |
0 | 280 |
* Get the current audio state: |
281 |
*/ |
|
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|
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typedef enum |
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{ |
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SDL_AUDIO_STOPPED = 0, |
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SDL_AUDIO_PLAYING, |
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SDL_AUDIO_PAUSED |
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} SDL_audiostatus; |
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extern DECLSPEC SDL_audiostatus SDLCALL SDL_GetAudioStatus(void); |
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extern DECLSPEC SDL_audiostatus SDLCALL |
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SDL_GetAudioDeviceStatus(SDL_AudioDeviceID dev); |
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/* |
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* This function pauses and unpauses the audio callback processing. |
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* It should be called with a parameter of 0 after opening the audio |
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* device to start playing sound. This is so you can safely initialize |
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* data for your callback function after opening the audio device. |
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* Silence will be written to the audio device during the pause. |
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*/ |
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extern DECLSPEC void SDLCALL SDL_PauseAudio(int pause_on); |
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extern DECLSPEC void SDLCALL SDL_PauseAudioDevice(SDL_AudioDeviceID dev, |
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int pause_on); |
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/* |
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* This function loads a WAVE from the data source, automatically freeing |
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* that source if 'freesrc' is non-zero. For example, to load a WAVE file, |
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* you could do: |
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* SDL_LoadWAV_RW(SDL_RWFromFile("sample.wav", "rb"), 1, ...); |
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* |
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* If this function succeeds, it returns the given SDL_AudioSpec, |
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* filled with the audio data format of the wave data, and sets |
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* 'audio_buf' to a malloc()'d buffer containing the audio data, |
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* and sets 'audio_len' to the length of that audio buffer, in bytes. |
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* You need to free the audio buffer with SDL_FreeWAV() when you are |
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* done with it. |
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* |
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* This function returns NULL and sets the SDL error message if the |
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* wave file cannot be opened, uses an unknown data format, or is |
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* corrupt. Currently raw and MS-ADPCM WAVE files are supported. |
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*/ |
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extern DECLSPEC SDL_AudioSpec *SDLCALL SDL_LoadWAV_RW(SDL_RWops * src, |
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int freesrc, |
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SDL_AudioSpec * spec, |
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Uint8 ** audio_buf, |
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Uint32 * audio_len); |
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/* Compatibility convenience function -- loads a WAV from a file */ |
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#define SDL_LoadWAV(file, spec, audio_buf, audio_len) \ |
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SDL_LoadWAV_RW(SDL_RWFromFile(file, "rb"),1, spec,audio_buf,audio_len) |
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||
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/* |
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* This function frees data previously allocated with SDL_LoadWAV_RW() |
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*/ |
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extern DECLSPEC void SDLCALL SDL_FreeWAV(Uint8 * audio_buf); |
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/* |
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* This function takes a source format and rate and a destination format |
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* and rate, and initializes the 'cvt' structure with information needed |
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* by SDL_ConvertAudio() to convert a buffer of audio data from one format |
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* to the other. |
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* Returns -1 if the format conversion is not supported, 0 if there's |
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* no conversion needed, or 1 if the audio filter is set up. |
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*/ |
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extern DECLSPEC int SDLCALL SDL_BuildAudioCVT(SDL_AudioCVT * cvt, |
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SDL_AudioFormat src_format, |
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Uint8 src_channels, |
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int src_rate, |
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SDL_AudioFormat dst_format, |
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Uint8 dst_channels, |
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int dst_rate); |
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/* Once you have initialized the 'cvt' structure using SDL_BuildAudioCVT(), |
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* created an audio buffer cvt->buf, and filled it with cvt->len bytes of |
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* audio data in the source format, this function will convert it in-place |
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* to the desired format. |
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* The data conversion may expand the size of the audio data, so the buffer |
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* cvt->buf should be allocated after the cvt structure is initialized by |
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* SDL_BuildAudioCVT(), and should be cvt->len*cvt->len_mult bytes long. |
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*/ |
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extern DECLSPEC int SDLCALL SDL_ConvertAudio(SDL_AudioCVT * cvt); |
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/* |
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* This takes two audio buffers of the playing audio format and mixes |
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* them, performing addition, volume adjustment, and overflow clipping. |
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* The volume ranges from 0 - 128, and should be set to SDL_MIX_MAXVOLUME |
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* for full audio volume. Note this does not change hardware volume. |
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* This is provided for convenience -- you can mix your own audio data. |
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*/ |
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#define SDL_MIX_MAXVOLUME 128 |
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extern DECLSPEC void SDLCALL SDL_MixAudio(Uint8 * dst, const Uint8 * src, |
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Uint32 len, int volume); |
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/* |
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* This works like SDL_MixAudio, but you specify the audio format instead of |
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* using the format of audio device 1. Thus it can be used when no audio |
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* device is open at all. |
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*/ |
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extern DECLSPEC void SDLCALL SDL_MixAudioFormat(Uint8 * dst, |
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const Uint8 * src, |
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SDL_AudioFormat format, |
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Uint32 len, int volume); |
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/* |
0 | 384 |
* The lock manipulated by these functions protects the callback function. |
385 |
* During a LockAudio/UnlockAudio pair, you can be guaranteed that the |
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* callback function is not running. Do not call these from the callback |
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* function or you will cause deadlock. |
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*/ |
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extern DECLSPEC void SDLCALL SDL_LockAudio(void); |
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extern DECLSPEC void SDLCALL SDL_LockAudioDevice(SDL_AudioDeviceID dev); |
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extern DECLSPEC void SDLCALL SDL_UnlockAudio(void); |
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extern DECLSPEC void SDLCALL SDL_UnlockAudioDevice(SDL_AudioDeviceID dev); |
0 | 393 |
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/* |
|
395 |
* This function shuts down audio processing and closes the audio device. |
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*/ |
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extern DECLSPEC void SDLCALL SDL_CloseAudio(void); |
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extern DECLSPEC void SDLCALL SDL_CloseAudioDevice(SDL_AudioDeviceID dev); |
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/* |
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401 |
* Returns 1 if audio device is still functioning, zero if not, -1 on error. |
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402 |
*/ |
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extern DECLSPEC int SDLCALL SDL_AudioDeviceConnected(SDL_AudioDeviceID dev); |
0 | 404 |
|
405 |
||
406 |
/* Ends C function definitions when using C++ */ |
|
407 |
#ifdef __cplusplus |
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/* *INDENT-OFF* */ |
0 | 409 |
} |
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/* *INDENT-ON* */ |
0 | 411 |
#endif |
412 |
#include "close_code.h" |
|
413 |
||
414 |
#endif /* _SDL_audio_h */ |
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/* vi: set ts=4 sw=4 expandtab: */ |