testaudiocapture.c
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/*
Copyright (C) 1997-2018 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.
*/
#include "SDL.h"
#include <stdlib.h>
#ifdef __EMSCRIPTEN__
#include <emscripten/emscripten.h>
#endif
static SDL_Window *window = NULL;
static SDL_Renderer *renderer = NULL;
static SDL_AudioSpec spec;
static SDL_AudioDeviceID devid_in = 0;
static SDL_AudioDeviceID devid_out = 0;
static void
loop()
{
SDL_bool please_quit = SDL_FALSE;
SDL_Event e;
while (SDL_PollEvent(&e)) {
if (e.type == SDL_QUIT) {
please_quit = SDL_TRUE;
} else if (e.type == SDL_KEYDOWN) {
if (e.key.keysym.sym == SDLK_ESCAPE) {
please_quit = SDL_TRUE;
}
} else if (e.type == SDL_MOUSEBUTTONDOWN) {
if (e.button.button == 1) {
SDL_PauseAudioDevice(devid_out, SDL_TRUE);
SDL_PauseAudioDevice(devid_in, SDL_FALSE);
}
} else if (e.type == SDL_MOUSEBUTTONUP) {
if (e.button.button == 1) {
SDL_PauseAudioDevice(devid_in, SDL_TRUE);
SDL_PauseAudioDevice(devid_out, SDL_FALSE);
}
}
}
if (SDL_GetAudioDeviceStatus(devid_in) == SDL_AUDIO_PLAYING) {
SDL_SetRenderDrawColor(renderer, 0, 255, 0, 255);
} else {
SDL_SetRenderDrawColor(renderer, 255, 0, 0, 255);
}
SDL_RenderClear(renderer);
SDL_RenderPresent(renderer);
if (please_quit) {
/* stop playing back, quit. */
SDL_Log("Shutting down.\n");
SDL_PauseAudioDevice(devid_in, 1);
SDL_CloseAudioDevice(devid_in);
SDL_PauseAudioDevice(devid_out, 1);
SDL_CloseAudioDevice(devid_out);
SDL_DestroyRenderer(renderer);
SDL_DestroyWindow(window);
SDL_Quit();
#ifdef __EMSCRIPTEN__
emscripten_cancel_main_loop();
#endif
exit(0);
}
/* Note that it would be easier to just have a one-line function that
calls SDL_QueueAudio() as a capture device callback, but we're
trying to test the API, so we use SDL_DequeueAudio() here. */
while (SDL_TRUE) {
Uint8 buf[1024];
const Uint32 br = SDL_DequeueAudio(devid_in, buf, sizeof (buf));
SDL_QueueAudio(devid_out, buf, br);
if (br < sizeof (buf)) {
break;
}
}
}
int
main(int argc, char **argv)
{
/* (argv[1] == NULL means "open default device.") */
const char *devname = argv[1];
SDL_AudioSpec wanted;
int devcount;
int i;
/* 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);
}
window = SDL_CreateWindow("testaudiocapture", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 320, 240, 0);
renderer = SDL_CreateRenderer(window, -1, 0);
SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
SDL_RenderClear(renderer);
SDL_RenderPresent(renderer);
SDL_Log("Using audio driver: %s\n", SDL_GetCurrentAudioDriver());
devcount = SDL_GetNumAudioDevices(SDL_TRUE);
for (i = 0; i < devcount; i++) {
SDL_Log(" Capture device #%d: '%s'\n", i, SDL_GetAudioDeviceName(i, SDL_TRUE));
}
SDL_zero(wanted);
wanted.freq = 44100;
wanted.format = AUDIO_F32SYS;
wanted.channels = 1;
wanted.samples = 4096;
wanted.callback = NULL;
SDL_zero(spec);
/* DirectSound can fail in some instances if you open the same hardware
for both capture and output and didn't open the output end first,
according to the docs, so if you're doing something like this, always
open your capture devices second in case you land in those bizarre
circumstances. */
SDL_Log("Opening default playback device...\n");
devid_out = SDL_OpenAudioDevice(NULL, SDL_FALSE, &wanted, &spec, SDL_AUDIO_ALLOW_ANY_CHANGE);
if (!devid_out) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't open an audio device for playback: %s!\n", SDL_GetError());
SDL_Quit();
exit(1);
}
SDL_Log("Opening capture device %s%s%s...\n",
devname ? "'" : "",
devname ? devname : "[[default]]",
devname ? "'" : "");
devid_in = SDL_OpenAudioDevice(argv[1], SDL_TRUE, &spec, &spec, 0);
if (!devid_in) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't open an audio device for capture: %s!\n", SDL_GetError());
SDL_Quit();
exit(1);
}
SDL_Log("Ready! Hold down mouse or finger to record!\n");
#ifdef __EMSCRIPTEN__
emscripten_set_main_loop(loop, 0, 1);
#else
while (1) { loop(); SDL_Delay(16); }
#endif
return 0;
}
SDL_GetNumAudioDevices
#define SDL_GetNumAudioDevices
Definition: SDL_dynapi_overrides.h:79
devid_out
static SDL_AudioDeviceID devid_out
Definition: testaudiocapture.c:24
SDL_WINDOWPOS_CENTERED
#define SDL_WINDOWPOS_CENTERED
Definition: SDL_video.h:139
SDL_PollEvent
#define SDL_PollEvent
Definition: SDL_dynapi_overrides.h:122
SDL_KEYDOWN
Definition: SDL_events.h:93
SDL_GetError
#define SDL_GetError
Definition: SDL_dynapi_overrides.h:113
SDL_CloseAudioDevice
#define SDL_CloseAudioDevice
Definition: SDL_dynapi_overrides.h:97
SDL_TRUE
Definition: SDL_stdinc.h:142
loop
static void loop()
Definition: testaudiocapture.c:27
SDL_OpenAudioDevice
#define SDL_OpenAudioDevice
Definition: SDL_dynapi_overrides.h:81
e
SDL_PRINTF_FORMAT_STRING const char int SDL_PRINTF_FORMAT_STRING const char int SDL_PRINTF_FORMAT_STRING const char int SDL_PRINTF_FORMAT_STRING const char const char SDL_SCANF_FORMAT_STRING const 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
SDL_MOUSEBUTTONUP
Definition: SDL_events.h:104
SDL_FALSE
Definition: SDL_stdinc.h:141
SDL_MOUSEBUTTONDOWN
Definition: SDL_events.h:103
SDL_QUIT
Definition: SDL_events.h:60
SDL_Renderer
Definition: SDL_sysrender.h:76
SDL_AudioSpec
Definition: SDL_audio.h:177
SDL_AudioSpec::samples
Uint16 samples
Definition: SDL_audio.h:183
SDL_CreateWindow
#define SDL_CreateWindow
Definition: SDL_dynapi_overrides.h:514
Uint32
uint32_t Uint32
Definition: SDL_stdinc.h:181
spec
static SDL_AudioSpec spec
Definition: testaudiocapture.c:22
main
int main(int argc, char **argv)
Definition: testaudiocapture.c:90
SDL_LogError
#define SDL_LogError
Definition: SDL_dynapi_overrides.h:36
SDL_GetAudioDeviceName
#define SDL_GetAudioDeviceName
Definition: SDL_dynapi_overrides.h:80
SDL_Log
#define SDL_Log
Definition: SDL_dynapi_overrides.h:31
SDL_MouseButtonEvent::button
Uint8 button
Definition: SDL_events.h:254
SDL_QueueAudio
#define SDL_QueueAudio
Definition: SDL_dynapi_overrides.h:588
SDL_AudioSpec::freq
int freq
Definition: SDL_audio.h:179
AUDIO_F32SYS
#define AUDIO_F32SYS
Definition: SDL_audio.h:125
SDL_AudioSpec::channels
Uint8 channels
Definition: SDL_audio.h:181
renderer
static SDL_Renderer * renderer
Definition: testaudiocapture.c:21
Uint8
uint8_t Uint8
Definition: SDL_stdinc.h:157
devid_in
static SDL_AudioDeviceID devid_in
Definition: testaudiocapture.c:23
SDL_Quit
#define SDL_Quit
Definition: SDL_dynapi_overrides.h:58
SDL_AUDIO_ALLOW_ANY_CHANGE
#define SDL_AUDIO_ALLOW_ANY_CHANGE
Definition: SDL_audio.h:143
SDL_zero
#define SDL_zero(x)
Definition: SDL_stdinc.h:416
SDL_GetAudioDeviceStatus
#define SDL_GetAudioDeviceStatus
Definition: SDL_dynapi_overrides.h:83
SDL_LOG_PRIORITY_INFO
Definition: SDL_log.h:106
SDL_KeyboardEvent::keysym
SDL_Keysym keysym
Definition: SDL_events.h:199
SDL_AudioSpec::callback
SDL_AudioCallback callback
Definition: SDL_audio.h:186
buf
GLenum GLuint GLenum GLsizei const GLchar * buf
Definition: SDL_opengl_glext.h:2480
SDL_Delay
#define SDL_Delay
Definition: SDL_dynapi_overrides.h:486
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_LogSetPriority
#define SDL_LogSetPriority
Definition: SDL_dynapi_overrides.h:236
SDL_GetCurrentAudioDriver
#define SDL_GetCurrentAudioDriver
Definition: SDL_dynapi_overrides.h:77
NULL
#define NULL
Definition: begin_code.h:164
SDL_bool
SDL_bool
Definition: SDL_stdinc.h:139
SDL_RenderClear
#define SDL_RenderClear
Definition: SDL_dynapi_overrides.h:334
SDL_INIT_AUDIO
#define SDL_INIT_AUDIO
Definition: SDL.h:77
window
EGLSurface EGLNativeWindowType * window
Definition: eglext.h:1025
SDL_Event::key
SDL_KeyboardEvent key
Definition: SDL_events.h:530
SDL_DequeueAudio
#define SDL_DequeueAudio
Definition: SDL_dynapi_overrides.h:604
SDL_AudioDeviceID
Uint32 SDL_AudioDeviceID
Definition: SDL_audio.h:329
SDL_AudioSpec::format
SDL_AudioFormat format
Definition: SDL_audio.h:180
SDL_Window
The type used to identify a window.
Definition: SDL_sysvideo.h:73
SDL_Keysym::sym
SDL_Keycode sym
Definition: SDL_keyboard.h:50
SDL_Event::button
SDL_MouseButtonEvent button
Definition: SDL_events.h:534
SDL_Init
#define SDL_Init
Definition: SDL_dynapi_overrides.h:54
SDL_Event
General event structure.
Definition: SDL_events.h:525
SDL_SetRenderDrawColor
#define SDL_SetRenderDrawColor
Definition: SDL_dynapi_overrides.h:330
SDL_DestroyRenderer
#define SDL_DestroyRenderer
Definition: SDL_dynapi_overrides.h:348
SDL_AUDIO_PLAYING
Definition: SDL_audio.h:397
SDLK_ESCAPE
Definition: SDL_keycode.h:55
SDL.h
SDL_DestroyWindow
#define SDL_DestroyWindow
Definition: SDL_dynapi_overrides.h:549
SDL_LOG_CATEGORY_APPLICATION
Definition: SDL_log.h:66
SDL_INIT_VIDEO
#define SDL_INIT_VIDEO
Definition: SDL.h:78
SDL_CreateRenderer
#define SDL_CreateRenderer
Definition: SDL_dynapi_overrides.h:301
SDL_RenderPresent
#define SDL_RenderPresent
Definition: SDL_dynapi_overrides.h:346
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Uint32 type
Definition: SDL_events.h:527
SDL_PauseAudioDevice
#define SDL_PauseAudioDevice
Definition: SDL_dynapi_overrides.h:85