Atlas - loopwavequeue.c
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[FILE BEGIN]
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
13/* Program to load a wave file and loop playing it using SDL sound queueing */
14
15#include <stdio.h>
16#include <stdlib.h>
17
18#ifdef __EMSCRIPTEN__
19#include <emscripten/emscripten.h>
20#endif
21
22#include "SDL.h"
23
24#if HAVE_SIGNAL_H
25#include <signal.h>
26#endif
27
28static struct
29{
30    SDL_AudioSpec spec;
31    Uint8 *sound;               /* Pointer to wave data */
32    Uint32 soundlen;            /* Length of wave data */
33} wave;
34
35
36/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
37static void
38quit(int rc)
39{
40    SDL_Quit();
41    exit(rc);
42}
43
44static int done = 0;
45void
46poked(int sig)
47{
48    done = 1;
49}
50
51void
52loop()
53{
54#ifdef __EMSCRIPTEN__
55    if (done || (SDL_GetAudioStatus() != SDL_AUDIO_PLAYING)) {
56        emscripten_cancel_main_loop();
57    }
58    else
59#endif
60    {
61        /* The device from SDL_OpenAudio() is always device #1. */
62        const Uint32 queued = SDL_GetQueuedAudioSize(1);
63        SDL_Log("Device has %u bytes queued.\n", (unsigned int) queued);
64        if (queued <= 8192) {  /* time to requeue the whole thing? */
65            if (SDL_QueueAudio(1, wave.sound, wave.soundlen) == 0) {
66                SDL_Log("Device queued %u more bytes.\n", (unsigned int) wave.soundlen);
67            } else {
68                SDL_Log("Device FAILED to queue %u more bytes: %s\n", (unsigned int) wave.soundlen, SDL_GetError());
69            }
70        }
71    }
72}
73
74int
75main(int argc, char *argv[])
76{
77    char filename[4096];
78
79    /* Enable standard application logging */
80    SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
81
82    /* Load the SDL library */
83    if (SDL_Init(SDL_INIT_AUDIO) < 0) {
84        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
85        return (1);
86    }
87
88    if (argc > 1) {
89        SDL_strlcpy(filename, argv[1], sizeof(filename));
90    } else {
91        SDL_strlcpy(filename, "sample.wav", sizeof(filename));
92    }
93    /* Load the wave file into memory */
94    if (SDL_LoadWAV(filename, &wave.spec, &wave.sound, &wave.soundlen) == NULL) {
95        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't load %s: %s\n", filename, SDL_GetError());
96        quit(1);
97    }
98
99    wave.spec.callback = NULL;  /* we'll push audio. */
100
101#if HAVE_SIGNAL_H
102    /* Set the signals */
103#ifdef SIGHUP
104    signal(SIGHUP, poked);
105#endif
106    signal(SIGINT, poked);
107#ifdef SIGQUIT
108    signal(SIGQUIT, poked);
109#endif
110    signal(SIGTERM, poked);
111#endif /* HAVE_SIGNAL_H */
112
113    /* Initialize fillerup() variables */
114    if (SDL_OpenAudio(&wave.spec, NULL) < 0) {
115        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't open audio: %s\n", SDL_GetError());
116        SDL_FreeWAV(wave.sound);
117        quit(2);
118    }
119
120    /*static x[99999]; SDL_QueueAudio(1, x, sizeof (x));*/
121
122    /* Let the audio run */
123    SDL_PauseAudio(0);
124
125    done = 0;
126
127    /* Note that we stuff the entire audio buffer into the queue in one
128       shot. Most apps would want to feed it a little at a time, as it
129       plays, but we're going for simplicity here. */
130    
131#ifdef __EMSCRIPTEN__
132    emscripten_set_main_loop(loop, 0, 1);
133#else
134    while (!done && (SDL_GetAudioStatus() == SDL_AUDIO_PLAYING))
135    {
136        loop();
137
138        SDL_Delay(100);  /* let it play for awhile. */
139    }
140#endif
141
142    /* Clean up on signal */
143    SDL_CloseAudio();
144    SDL_FreeWAV(wave.sound);
145    SDL_Quit();
146    return 0;
147}
148
149/* vi: set ts=4 sw=4 expandtab: */
150
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