testaudiohotplug.c
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/*
Copyright (C) 1997-2019 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely.
*/
/* Program to test hotplugging of audio devices */
#include "SDL_config.h"
#include <stdio.h>
#include <stdlib.h>
#if HAVE_SIGNAL_H
#include <signal.h>
#endif
#ifdef __EMSCRIPTEN__
#include <emscripten/emscripten.h>
#endif
#include "SDL.h"
static SDL_AudioSpec spec;
static Uint8 *sound = NULL; /* Pointer to wave data */
static Uint32 soundlen = 0; /* Length of wave data */
static int posindex = 0;
static Uint32 positions[64];
/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
static void
quit(int rc)
{
SDL_Quit();
exit(rc);
}
void SDLCALL
fillerup(void *_pos, Uint8 * stream, int len)
{
Uint32 pos = *((Uint32 *) _pos);
Uint8 *waveptr;
int waveleft;
/* Set up the pointers */
waveptr = sound + pos;
waveleft = soundlen - pos;
/* Go! */
while (waveleft <= len) {
SDL_memcpy(stream, waveptr, waveleft);
stream += waveleft;
len -= waveleft;
waveptr = sound;
waveleft = soundlen;
pos = 0;
}
SDL_memcpy(stream, waveptr, len);
pos += len;
*((Uint32 *) _pos) = pos;
}
static int done = 0;
void
poked(int sig)
{
done = 1;
}
static const char*
devtypestr(int iscapture)
{
return iscapture ? "capture" : "output";
}
static void
iteration()
{
SDL_Event e;
SDL_AudioDeviceID dev;
while (SDL_PollEvent(&e)) {
if (e.type == SDL_QUIT) {
done = 1;
} else if (e.type == SDL_KEYUP) {
if (e.key.keysym.sym == SDLK_ESCAPE)
done = 1;
} else if (e.type == SDL_AUDIODEVICEADDED) {
int index = e.adevice.which;
int iscapture = e.adevice.iscapture;
const char *name = SDL_GetAudioDeviceName(index, iscapture);
if (name != NULL)
SDL_Log("New %s audio device at index %u: %s\n", devtypestr(iscapture), (unsigned int) index, name);
else {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Got new %s device at index %u, but failed to get the name: %s\n",
devtypestr(iscapture), (unsigned int) index, SDL_GetError());
continue;
}
if (!iscapture) {
positions[posindex] = 0;
spec.userdata = &positions[posindex++];
spec.callback = fillerup;
dev = SDL_OpenAudioDevice(name, 0, &spec, NULL, 0);
if (!dev) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't open '%s': %s\n", name, SDL_GetError());
} else {
SDL_Log("Opened '%s' as %u\n", name, (unsigned int) dev);
SDL_PauseAudioDevice(dev, 0);
}
}
} else if (e.type == SDL_AUDIODEVICEREMOVED) {
dev = (SDL_AudioDeviceID) e.adevice.which;
SDL_Log("%s device %u removed.\n", devtypestr(e.adevice.iscapture), (unsigned int) dev);
SDL_CloseAudioDevice(dev);
}
}
}
#ifdef __EMSCRIPTEN__
void
loop()
{
if(done)
emscripten_cancel_main_loop();
else
iteration();
}
#endif
int
main(int argc, char *argv[])
{
int i;
char filename[4096];
/* Enable standard application logging */
SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
/* Load the SDL library */
if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) < 0) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
return (1);
}
/* Some targets (Mac CoreAudio) need an event queue for audio hotplug, so make and immediately hide a window. */
SDL_MinimizeWindow(SDL_CreateWindow("testaudiohotplug", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 640, 480, 0));
if (argc > 1) {
SDL_strlcpy(filename, argv[1], sizeof(filename));
} else {
SDL_strlcpy(filename, "sample.wav", sizeof(filename));
}
/* Load the wave file into memory */
if (SDL_LoadWAV(filename, &spec, &sound, &soundlen) == NULL) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't load %s: %s\n", filename, SDL_GetError());
quit(1);
}
#if HAVE_SIGNAL_H
/* Set the signals */
#ifdef SIGHUP
signal(SIGHUP, poked);
#endif
signal(SIGINT, poked);
#ifdef SIGQUIT
signal(SIGQUIT, poked);
#endif
signal(SIGTERM, poked);
#endif /* HAVE_SIGNAL_H */
/* Show the list of available drivers */
SDL_Log("Available audio drivers:");
for (i = 0; i < SDL_GetNumAudioDrivers(); ++i) {
SDL_Log("%i: %s", i, SDL_GetAudioDriver(i));
}
SDL_Log("Select a driver with the SDL_AUDIODRIVER environment variable.\n");
SDL_Log("Using audio driver: %s\n", SDL_GetCurrentAudioDriver());
#ifdef __EMSCRIPTEN__
emscripten_set_main_loop(loop, 0, 1);
#else
while (!done) {
SDL_Delay(100);
iteration();
}
#endif
/* Clean up on signal */
/* Quit audio first, then free WAV. This prevents access violations in the audio threads. */
SDL_QuitSubSystem(SDL_INIT_AUDIO);
SDL_FreeWAV(sound);
SDL_Quit();
return (0);
}
/* vi: set ts=4 sw=4 expandtab: */
SDL.h
SDL_CloseAudioDevice
#define SDL_CloseAudioDevice
Definition: SDL_dynapi_overrides.h:97
done
static int done
Definition: testaudiohotplug.c:70
sort_controllers.filename
string filename
Definition: sort_controllers.py:8
SDL_GetError
#define SDL_GetError
Definition: SDL_dynapi_overrides.h:113
Uint32
uint32_t Uint32
Definition: SDL_stdinc.h:203
SDL_PauseAudioDevice
#define SDL_PauseAudioDevice
Definition: SDL_dynapi_overrides.h:85
SDL_strlcpy
#define SDL_strlcpy
Definition: SDL_dynapi_overrides.h:394
SDL_PollEvent
#define SDL_PollEvent
Definition: SDL_dynapi_overrides.h:122
SDL_LOG_CATEGORY_APPLICATION
@ SDL_LOG_CATEGORY_APPLICATION
Definition: SDL_log.h:66
NULL
#define NULL
Definition: begin_code.h:167
SDL_OpenAudioDevice
#define SDL_OpenAudioDevice
Definition: SDL_dynapi_overrides.h:81
poked
void poked(int sig)
Definition: testaudiohotplug.c:72
SDL_KEYUP
@ SDL_KEYUP
Definition: SDL_events.h:97
sound
static Uint8 * sound
Definition: testaudiohotplug.c:31
SDLCALL
#define SDLCALL
Definition: SDL_internal.h:49
SDL_AudioSpec::callback
SDL_AudioCallback callback
Definition: SDL_audio.h:187
stream
GLuint GLuint stream
Definition: SDL_opengl_glext.h:1776
SDL_QuitSubSystem
#define SDL_QuitSubSystem
Definition: SDL_dynapi_overrides.h:56
SDL_WINDOWPOS_UNDEFINED
#define SDL_WINDOWPOS_UNDEFINED
Definition: SDL_video.h:130
SDL_AudioSpec
Definition: SDL_audio.h:178
SDL_AudioSpec::userdata
void * userdata
Definition: SDL_audio.h:188
index
GLuint index
Definition: SDL_opengl_glext.h:660
SDL_AUDIODEVICEADDED
@ SDL_AUDIODEVICEADDED
Definition: SDL_events.h:147
SDL_CreateWindow
#define SDL_CreateWindow
Definition: SDL_dynapi_overrides.h:514
SDL_FreeWAV
#define SDL_FreeWAV
Definition: SDL_dynapi_overrides.h:87
SDL_LogError
#define SDL_LogError
Definition: SDL_dynapi_overrides.h:36
fillerup
void fillerup(void *_pos, Uint8 *stream, int len)
Definition: testaudiohotplug.c:46
iteration
static void iteration()
Definition: testaudiohotplug.c:84
SDLK_ESCAPE
@ SDLK_ESCAPE
Definition: SDL_keycode.h:55
SDL_MinimizeWindow
#define SDL_MinimizeWindow
Definition: SDL_dynapi_overrides.h:537
len
GLenum GLsizei len
Definition: SDL_opengl_glext.h:2926
SDL_memcpy
#define SDL_memcpy
Definition: SDL_dynapi_overrides.h:387
loop
void loop()
Definition: checkkeys.c:152
SDL_AudioDeviceID
Uint32 SDL_AudioDeviceID
Definition: SDL_audio.h:330
SDL_GetAudioDeviceName
#define SDL_GetAudioDeviceName
Definition: SDL_dynapi_overrides.h:80
SDL_Log
#define SDL_Log
Definition: SDL_dynapi_overrides.h:31
devtypestr
static const char * devtypestr(int iscapture)
Definition: testaudiohotplug.c:78
SDL_QUIT
@ SDL_QUIT
Definition: SDL_events.h:60
name
GLuint const GLchar * name
Definition: SDL_opengl_glext.h:660
SDL_LoadWAV
#define SDL_LoadWAV(file, spec, audio_buf, audio_len)
Definition: SDL_audio.h:484
SDL_Quit
#define SDL_Quit
Definition: SDL_dynapi_overrides.h:58
SDL_Delay
#define SDL_Delay
Definition: SDL_dynapi_overrides.h:486
SDL_GetAudioDriver
#define SDL_GetAudioDriver
Definition: SDL_dynapi_overrides.h:74
SDL_GetCurrentAudioDriver
#define SDL_GetCurrentAudioDriver
Definition: SDL_dynapi_overrides.h:77
spec
static SDL_AudioSpec spec
Definition: testaudiohotplug.c:30
soundlen
static Uint32 soundlen
Definition: testaudiohotplug.c:32
SDL_INIT_VIDEO
#define SDL_INIT_VIDEO
Definition: SDL.h:79
SDL_LOG_PRIORITY_INFO
@ SDL_LOG_PRIORITY_INFO
Definition: SDL_log.h:106
main
int main(int argc, char *argv[])
Definition: testaudiohotplug.c:137
quit
static void quit(int rc)
Definition: testaudiohotplug.c:39
SDL_LogSetPriority
#define SDL_LogSetPriority
Definition: SDL_dynapi_overrides.h:236
e
const SDL_PRINTF_FORMAT_STRING char int const SDL_PRINTF_FORMAT_STRING char int const SDL_PRINTF_FORMAT_STRING char int const SDL_PRINTF_FORMAT_STRING char const char const SDL_SCANF_FORMAT_STRING char return SDL_ThreadFunction const char void return Uint32 return Uint32 SDL_AssertionHandler void SDL_SpinLock SDL_atomic_t int int return SDL_atomic_t return void void void return void return int return SDL_AudioSpec SDL_AudioSpec return int int return return int SDL_RWops int SDL_AudioSpec Uint8 Uint32 * e
Definition: SDL_dynapi_procs.h:117
positions
static Uint32 positions[64]
Definition: testaudiohotplug.c:35
SDL_Event
General event structure.
Definition: SDL_events.h:557
SDL_AUDIODEVICEREMOVED
@ SDL_AUDIODEVICEREMOVED
Definition: SDL_events.h:148
posindex
static int posindex
Definition: testaudiohotplug.c:34
SDL_Init
#define SDL_Init
Definition: SDL_dynapi_overrides.h:54
i
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int in i)
Definition: SDL_x11sym.h:50
SDL_GetNumAudioDrivers
#define SDL_GetNumAudioDrivers
Definition: SDL_dynapi_overrides.h:73
SDL_INIT_AUDIO
#define SDL_INIT_AUDIO
Definition: SDL.h:78
Uint8
uint8_t Uint8
Definition: SDL_stdinc.h:179