testaudiocapture.c
Go to the documentation of this file.
/*
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.
*/
#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.h
SDL_zero
#define SDL_zero(x)
Definition: SDL_stdinc.h:416
SDL_CloseAudioDevice
#define SDL_CloseAudioDevice
Definition: SDL_dynapi_overrides.h:97
SDL_GetError
#define SDL_GetError
Definition: SDL_dynapi_overrides.h:113
SDL_RenderPresent
#define SDL_RenderPresent
Definition: SDL_dynapi_overrides.h:346
SDL_AudioSpec::channels
Uint8 channels
Definition: SDL_audio.h:182
Uint32
uint32_t Uint32
Definition: SDL_stdinc.h:203
SDL_PauseAudioDevice
#define SDL_PauseAudioDevice
Definition: SDL_dynapi_overrides.h:85
SDL_GetNumAudioDevices
#define SDL_GetNumAudioDevices
Definition: SDL_dynapi_overrides.h:79
SDL_WINDOWPOS_CENTERED
#define SDL_WINDOWPOS_CENTERED
Definition: SDL_video.h:139
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
SDL_AudioSpec::samples
Uint16 samples
Definition: SDL_audio.h:184
SDL_AudioSpec::format
SDL_AudioFormat format
Definition: SDL_audio.h:181
SDL_AudioSpec::callback
SDL_AudioCallback callback
Definition: SDL_audio.h:187
SDL_MOUSEBUTTONUP
@ SDL_MOUSEBUTTONUP
Definition: SDL_events.h:107
SDL_AudioSpec
Definition: SDL_audio.h:178
SDL_KEYDOWN
@ SDL_KEYDOWN
Definition: SDL_events.h:96
SDL_CreateWindow
#define SDL_CreateWindow
Definition: SDL_dynapi_overrides.h:514
SDL_LogError
#define SDL_LogError
Definition: SDL_dynapi_overrides.h:36
SDL_Window
The type used to identify a window.
Definition: SDL_sysvideo.h:73
main
int main(int argc, char **argv)
Definition: testaudiocapture.c:90
SDLK_ESCAPE
@ SDLK_ESCAPE
Definition: SDL_keycode.h:55
buf
GLenum GLuint GLenum GLsizei const GLchar * buf
Definition: SDL_opengl_glext.h:2480
SDL_Renderer
Definition: SDL_sysrender.h:122
SDL_FALSE
@ SDL_FALSE
Definition: SDL_stdinc.h:163
SDL_AudioDeviceID
Uint32 SDL_AudioDeviceID
Definition: SDL_audio.h:330
SDL_GetAudioDeviceName
#define SDL_GetAudioDeviceName
Definition: SDL_dynapi_overrides.h:80
window
EGLSurface EGLNativeWindowType * window
Definition: eglext.h:1025
SDL_Log
#define SDL_Log
Definition: SDL_dynapi_overrides.h:31
SDL_QueueAudio
#define SDL_QueueAudio
Definition: SDL_dynapi_overrides.h:588
SDL_AUDIO_ALLOW_ANY_CHANGE
#define SDL_AUDIO_ALLOW_ANY_CHANGE
Definition: SDL_audio.h:144
SDL_QUIT
@ SDL_QUIT
Definition: SDL_events.h:60
AUDIO_F32SYS
#define AUDIO_F32SYS
Definition: SDL_audio.h:130
loop
static void loop()
Definition: testaudiocapture.c:27
SDL_Quit
#define SDL_Quit
Definition: SDL_dynapi_overrides.h:58
SDL_GetAudioDeviceStatus
#define SDL_GetAudioDeviceStatus
Definition: SDL_dynapi_overrides.h:83
SDL_Delay
#define SDL_Delay
Definition: SDL_dynapi_overrides.h:486
SDL_AudioSpec::freq
int freq
Definition: SDL_audio.h:180
SDL_GetCurrentAudioDriver
#define SDL_GetCurrentAudioDriver
Definition: SDL_dynapi_overrides.h:77
SDL_INIT_VIDEO
#define SDL_INIT_VIDEO
Definition: SDL.h:79
SDL_LOG_PRIORITY_INFO
@ SDL_LOG_PRIORITY_INFO
Definition: SDL_log.h:106
renderer
static SDL_Renderer * renderer
Definition: testaudiocapture.c:21
SDL_TRUE
@ SDL_TRUE
Definition: SDL_stdinc.h:164
SDL_LogSetPriority
#define SDL_LogSetPriority
Definition: SDL_dynapi_overrides.h:236
SDL_AUDIO_PLAYING
@ SDL_AUDIO_PLAYING
Definition: SDL_audio.h:398
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
SDL_DequeueAudio
#define SDL_DequeueAudio
Definition: SDL_dynapi_overrides.h:604
SDL_RenderClear
#define SDL_RenderClear
Definition: SDL_dynapi_overrides.h:334
SDL_SetRenderDrawColor
#define SDL_SetRenderDrawColor
Definition: SDL_dynapi_overrides.h:330
SDL_MOUSEBUTTONDOWN
@ SDL_MOUSEBUTTONDOWN
Definition: SDL_events.h:106
spec
static SDL_AudioSpec spec
Definition: testaudiocapture.c:22
SDL_Event
General event structure.
Definition: SDL_events.h:557
SDL_CreateRenderer
#define SDL_CreateRenderer
Definition: SDL_dynapi_overrides.h:301
SDL_Init
#define SDL_Init
Definition: SDL_dynapi_overrides.h:54
SDL_DestroyRenderer
#define SDL_DestroyRenderer
Definition: SDL_dynapi_overrides.h:348
devid_out
static SDL_AudioDeviceID devid_out
Definition: testaudiocapture.c:24
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
devid_in
static SDL_AudioDeviceID devid_in
Definition: testaudiocapture.c:23
SDL_DestroyWindow
#define SDL_DestroyWindow
Definition: SDL_dynapi_overrides.h:549
SDL_bool
SDL_bool
Definition: SDL_stdinc.h:161
SDL_INIT_AUDIO
#define SDL_INIT_AUDIO
Definition: SDL.h:78
Uint8
uint8_t Uint8
Definition: SDL_stdinc.h:179