Atlas - loopwave.c
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[FILE BEGIN]
1/*
2  Copyright (C) 1997-2025 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 audio */
14
15/* loopwaves.c is much more robust in handling WAVE files --
16    This is only for simple WAVEs
17*/
18#include <stdlib.h>
19
20#define SDL_MAIN_USE_CALLBACKS 1
21#include <SDL3/SDL.h>
22#include <SDL3/SDL_main.h>
23#include <SDL3/SDL_test.h>
24#include "testutils.h"
25
26static struct
27{
28    SDL_AudioSpec spec;
29    Uint8 *sound;    /* Pointer to wave data */
30    Uint32 soundlen; /* Length of wave data */
31} wave;
32
33static SDL_AudioStream *stream;
34static SDLTest_CommonState *state;
35
36static int fillerup(void)
37{
38    const int minimum = (wave.soundlen / SDL_AUDIO_FRAMESIZE(wave.spec)) / 2;
39    if (SDL_GetAudioStreamQueued(stream) < minimum) {
40        SDL_PutAudioStreamData(stream, wave.sound, wave.soundlen);
41    }
42    return SDL_APP_CONTINUE;
43}
44
45SDL_AppResult SDL_AppInit(void **appstate, int argc, char *argv[])
46{
47    int i;
48    char *filename = NULL;
49
50    /* this doesn't have to run very much, so give up tons of CPU time between iterations. */
51    SDL_SetHint(SDL_HINT_MAIN_CALLBACK_RATE, "5");
52
53    /* Initialize test framework */
54    state = SDLTest_CommonCreateState(argv, 0);
55    if (!state) {
56        return SDL_APP_SUCCESS;
57    }
58
59    /* Parse commandline */
60    for (i = 1; i < argc;) {
61        int consumed;
62
63        consumed = SDLTest_CommonArg(state, i);
64        if (!consumed) {
65            if (SDL_strcmp(argv[i], "--role") == 0 && argv[i + 1]) {
66                SDL_SetHint(SDL_HINT_AUDIO_DEVICE_STREAM_ROLE, argv[i + 1]);
67                ++i;
68                consumed = 1;
69            } else if (!filename) {
70                filename = argv[i];
71                consumed = 1;
72            }
73        }
74        if (consumed <= 0) {
75            static const char *options[] = { "[--role ROLE]", "[sample.wav]", NULL };
76            SDLTest_CommonLogUsage(state, argv[0], options);
77            exit(1);
78        }
79
80        i += consumed;
81    }
82
83    /* Load the SDL library */
84    if (!SDL_Init(SDL_INIT_AUDIO | SDL_INIT_EVENTS)) {
85        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s", SDL_GetError());
86        return SDL_APP_FAILURE;
87    }
88
89    filename = GetResourceFilename(filename, "sample.wav");
90
91    if (!filename) {
92        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "%s", SDL_GetError());
93        return SDL_APP_FAILURE;
94    }
95
96    /* Load the wave file into memory */
97    if (!SDL_LoadWAV(filename, &wave.spec, &wave.sound, &wave.soundlen)) {
98        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't load %s: %s", filename, SDL_GetError());
99        SDL_free(filename);
100        return SDL_APP_FAILURE;
101    }
102
103    SDL_free(filename);
104
105    /* Show the list of available drivers */
106    SDL_Log("Available audio drivers:");
107    for (i = 0; i < SDL_GetNumAudioDrivers(); ++i) {
108        SDL_Log("%i: %s", i, SDL_GetAudioDriver(i));
109    }
110
111    SDL_Log("Using audio driver: %s", SDL_GetCurrentAudioDriver());
112    SDL_Log("Current audio device name: %s", SDL_GetAudioDeviceName(SDL_AUDIO_DEVICE_DEFAULT_PLAYBACK));
113
114    stream = SDL_OpenAudioDeviceStream(SDL_AUDIO_DEVICE_DEFAULT_PLAYBACK, &wave.spec, NULL, NULL);
115    if (!stream) {
116        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create audio stream: %s", SDL_GetError());
117        return SDL_APP_FAILURE;
118    }
119
120    SDL_ResumeAudioStreamDevice(stream);
121
122    return SDL_APP_CONTINUE;
123}
124
125SDL_AppResult SDL_AppEvent(void *appstate, SDL_Event *event)
126{
127    return (event->type == SDL_EVENT_QUIT) ? SDL_APP_SUCCESS : SDL_APP_CONTINUE;
128}
129
130SDL_AppResult SDL_AppIterate(void *appstate)
131{
132    return fillerup();
133}
134
135void SDL_AppQuit(void *appstate, SDL_AppResult result)
136{
137    SDL_DestroyAudioStream(stream);
138    SDL_free(wave.sound);
139    SDL_Quit();
140    SDLTest_CommonDestroyState(state);
141}
142
143
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