Atlas - testaudiocapture.c
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1/*
2  Copyright (C) 1997-2018 Sam Lantinga <[email protected]>
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
20static SDL_Window *window = NULL;
21static SDL_Renderer *renderer = NULL;
22static SDL_AudioSpec spec;
23static SDL_AudioDeviceID devid_in = 0;
24static SDL_AudioDeviceID devid_out = 0;
25
26static void
27loop()
28{
29    SDL_bool please_quit = SDL_FALSE;
30    SDL_Event e;
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) {
41                SDL_PauseAudioDevice(devid_out, SDL_TRUE);
42                SDL_PauseAudioDevice(devid_in, SDL_FALSE);
43            }
44        } else if (e.type == SDL_MOUSEBUTTONUP) {
45            if (e.button.button == 1) {
46                SDL_PauseAudioDevice(devid_in, SDL_TRUE);
47                SDL_PauseAudioDevice(devid_out, SDL_FALSE);
48            }
49        }
50    }
51
52    if (SDL_GetAudioDeviceStatus(devid_in) == SDL_AUDIO_PLAYING) {
53        SDL_SetRenderDrawColor(renderer, 0, 255, 0, 255);
54    } else {
55        SDL_SetRenderDrawColor(renderer, 255, 0, 0, 255);
56    }
57    SDL_RenderClear(renderer);
58    SDL_RenderPresent(renderer);
59
60    if (please_quit) {
61        /* stop playing back, quit. */
62        SDL_Log("Shutting down.\n");
63        SDL_PauseAudioDevice(devid_in, 1);
64        SDL_CloseAudioDevice(devid_in);
65        SDL_PauseAudioDevice(devid_out, 1);
66        SDL_CloseAudioDevice(devid_out);
67        SDL_DestroyRenderer(renderer);
68        SDL_DestroyWindow(window);
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));
82        SDL_QueueAudio(devid_out, buf, br);
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 */
99    SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
100
101    /* Load the SDL library */
102    if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) < 0) {
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);
108    renderer = SDL_CreateRenderer(window, -1, 0);
109    SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
110    SDL_RenderClear(renderer);
111    SDL_RenderPresent(renderer);
112
113    SDL_Log("Using audio driver: %s\n", SDL_GetCurrentAudioDriver());
114
115    devcount = SDL_GetNumAudioDevices(SDL_TRUE);
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");
136    devid_out = SDL_OpenAudioDevice(NULL, SDL_FALSE, &wanted, &spec, SDL_AUDIO_ALLOW_ANY_CHANGE);
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
166
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