SDL 2.0
testaudiocapture.c
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1/*
2 Copyright (C) 1997-2019 Sam Lantinga <slouken@libsdl.org>
3
4 This software is provided 'as-is', without any express or implied
5 warranty. In no event will the authors be held liable for any damages
6 arising from the use of this software.
7
8 Permission is granted to anyone to use this software for any purpose,
9 including commercial applications, and to alter it and redistribute it
10 freely.
11*/
12#include "SDL.h"
13
14#include <stdlib.h>
15
16#ifdef __EMSCRIPTEN__
17#include <emscripten/emscripten.h>
18#endif
19
25
26static void
28{
29 SDL_bool please_quit = SDL_FALSE;
31
32 while (SDL_PollEvent(&e)) {
33 if (e.type == SDL_QUIT) {
34 please_quit = SDL_TRUE;
35 } else if (e.type == SDL_KEYDOWN) {
36 if (e.key.keysym.sym == SDLK_ESCAPE) {
37 please_quit = SDL_TRUE;
38 }
39 } else if (e.type == SDL_MOUSEBUTTONDOWN) {
40 if (e.button.button == 1) {
43 }
44 } else if (e.type == SDL_MOUSEBUTTONUP) {
45 if (e.button.button == 1) {
48 }
49 }
50 }
51
53 SDL_SetRenderDrawColor(renderer, 0, 255, 0, 255);
54 } else {
55 SDL_SetRenderDrawColor(renderer, 255, 0, 0, 255);
56 }
59
60 if (please_quit) {
61 /* stop playing back, quit. */
62 SDL_Log("Shutting down.\n");
69 SDL_Quit();
70 #ifdef __EMSCRIPTEN__
71 emscripten_cancel_main_loop();
72 #endif
73 exit(0);
74 }
75
76 /* Note that it would be easier to just have a one-line function that
77 calls SDL_QueueAudio() as a capture device callback, but we're
78 trying to test the API, so we use SDL_DequeueAudio() here. */
79 while (SDL_TRUE) {
80 Uint8 buf[1024];
81 const Uint32 br = SDL_DequeueAudio(devid_in, buf, sizeof (buf));
83 if (br < sizeof (buf)) {
84 break;
85 }
86 }
87}
88
89int
90main(int argc, char **argv)
91{
92 /* (argv[1] == NULL means "open default device.") */
93 const char *devname = argv[1];
94 SDL_AudioSpec wanted;
95 int devcount;
96 int i;
97
98 /* Enable standard application logging */
100
101 /* Load the SDL library */
103 SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
104 return (1);
105 }
106
107 window = SDL_CreateWindow("testaudiocapture", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 320, 240, 0);
109 SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
112
113 SDL_Log("Using audio driver: %s\n", SDL_GetCurrentAudioDriver());
114
116 for (i = 0; i < devcount; i++) {
117 SDL_Log(" Capture device #%d: '%s'\n", i, SDL_GetAudioDeviceName(i, SDL_TRUE));
118 }
119
120 SDL_zero(wanted);
121 wanted.freq = 44100;
122 wanted.format = AUDIO_F32SYS;
123 wanted.channels = 1;
124 wanted.samples = 4096;
125 wanted.callback = NULL;
126
127 SDL_zero(spec);
128
129 /* DirectSound can fail in some instances if you open the same hardware
130 for both capture and output and didn't open the output end first,
131 according to the docs, so if you're doing something like this, always
132 open your capture devices second in case you land in those bizarre
133 circumstances. */
134
135 SDL_Log("Opening default playback device...\n");
137 if (!devid_out) {
138 SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't open an audio device for playback: %s!\n", SDL_GetError());
139 SDL_Quit();
140 exit(1);
141 }
142
143 SDL_Log("Opening capture device %s%s%s...\n",
144 devname ? "'" : "",
145 devname ? devname : "[[default]]",
146 devname ? "'" : "");
147
148 devid_in = SDL_OpenAudioDevice(argv[1], SDL_TRUE, &spec, &spec, 0);
149 if (!devid_in) {
150 SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't open an audio device for capture: %s!\n", SDL_GetError());
151 SDL_Quit();
152 exit(1);
153 }
154
155 SDL_Log("Ready! Hold down mouse or finger to record!\n");
156
157#ifdef __EMSCRIPTEN__
158 emscripten_set_main_loop(loop, 0, 1);
159#else
160 while (1) { loop(); SDL_Delay(16); }
161#endif
162
163 return 0;
164}
165
#define SDL_INIT_AUDIO
Definition: SDL.h:78
#define SDL_INIT_VIDEO
Definition: SDL.h:79
@ SDL_AUDIO_PLAYING
Definition: SDL_audio.h:398
#define SDL_AUDIO_ALLOW_ANY_CHANGE
Definition: SDL_audio.h:144
#define AUDIO_F32SYS
Definition: SDL_audio.h:125
Uint32 SDL_AudioDeviceID
Definition: SDL_audio.h:330
#define SDL_RenderPresent
#define SDL_DestroyWindow
#define SDL_GetError
#define SDL_PollEvent
#define SDL_DestroyRenderer
#define SDL_DequeueAudio
#define SDL_SetRenderDrawColor
#define SDL_CreateWindow
#define SDL_GetAudioDeviceName
#define SDL_CreateRenderer
#define SDL_GetCurrentAudioDriver
#define SDL_LogSetPriority
#define SDL_OpenAudioDevice
#define SDL_RenderClear
#define SDL_LogError
#define SDL_QueueAudio
#define SDL_PauseAudioDevice
#define SDL_GetAudioDeviceStatus
#define SDL_Delay
#define SDL_Quit
#define SDL_Init
#define SDL_CloseAudioDevice
#define SDL_GetNumAudioDevices
#define SDL_Log
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
@ SDL_QUIT
Definition: SDL_events.h:60
@ SDL_MOUSEBUTTONUP
Definition: SDL_events.h:107
@ SDL_MOUSEBUTTONDOWN
Definition: SDL_events.h:106
@ SDL_KEYDOWN
Definition: SDL_events.h:96
@ SDLK_ESCAPE
Definition: SDL_keycode.h:55
@ SDL_LOG_PRIORITY_INFO
Definition: SDL_log.h:106
@ SDL_LOG_CATEGORY_APPLICATION
Definition: SDL_log.h:66
GLenum GLuint GLenum GLsizei const GLchar * buf
#define SDL_zero(x)
Definition: SDL_stdinc.h:416
SDL_bool
Definition: SDL_stdinc.h:162
@ SDL_TRUE
Definition: SDL_stdinc.h:164
@ SDL_FALSE
Definition: SDL_stdinc.h:163
uint32_t Uint32
Definition: SDL_stdinc.h:203
uint8_t Uint8
Definition: SDL_stdinc.h:179
#define SDL_WINDOWPOS_CENTERED
Definition: SDL_video.h:139
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
#define NULL
Definition: begin_code.h:167
EGLSurface EGLNativeWindowType * window
Definition: eglext.h:1025
SDL_AudioCallback callback
Definition: SDL_audio.h:187
Uint16 samples
Definition: SDL_audio.h:184
Uint8 channels
Definition: SDL_audio.h:182
SDL_AudioFormat format
Definition: SDL_audio.h:181
The type used to identify a window.
Definition: SDL_sysvideo.h:74
static void loop()
int main(int argc, char **argv)
static SDL_AudioSpec spec
static SDL_AudioDeviceID devid_in
static SDL_AudioDeviceID devid_out
static SDL_Renderer * renderer
General event structure.
Definition: SDL_events.h:558