1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
|
/*******************************************************************************************
*
* raylib [audio] example - Raw audio streaming
*
* NOTE: This example requires OpenAL Soft library installed
*
* This example has been created using raylib 1.6 (www.raylib.com)
* raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
*
* Copyright (c) 2015 Ramon Santamaria (@raysan5)
*
********************************************************************************************/
#include "raylib.h"
#if defined(PLATFORM_WEB)
#include <emscripten/emscripten.h>
#endif
#if defined(PLATFORM_ANDROID)
#include "android_native_app_glue.h"
#endif
#include <stdlib.h> // Required for: malloc(), free()
#include <math.h> // Required for: sinf()
#define MAX_SAMPLES 22050
#define MAX_SAMPLES_PER_UPDATE 4096
//----------------------------------------------------------------------------------
// Global Variables Definition
//----------------------------------------------------------------------------------
const int screenWidth = 800;
const int screenHeight = 450;
AudioStream stream;
short *data;
int totalSamples = MAX_SAMPLES;
int samplesLeft = MAX_SAMPLES;
Vector2 position = { 0, 0 };
//----------------------------------------------------------------------------------
// Module Functions Declaration
//----------------------------------------------------------------------------------
void UpdateDrawFrame(void); // Update and Draw one frame
//----------------------------------------------------------------------------------
// Main Enry Point
//----------------------------------------------------------------------------------
#if defined(PLATFORM_ANDROID)
void android_main(struct android_app *app)
#else
int main(void)
#endif
{
// Initialization
//--------------------------------------------------------------------------------------
#if defined(PLATFORM_ANDROID)
InitWindow(screenWidth, screenHeight, app);
#else
InitWindow(screenWidth, screenHeight, "raylib [audio] example - raw audio streaming");
#endif
InitAudioDevice(); // Initialize audio device
// Init raw audio stream (sample rate: 22050, sample size: 16bit-short, channels: 1-mono)
stream = InitAudioStream(22050, 16, 1);
// Generate samples data from sine wave
data = (short *)malloc(sizeof(short)*MAX_SAMPLES);
// TODO: Review data generation, it seems data is discontinued for loop,
// for that reason, there is a clip everytime audio stream is looped...
for (int i = 0; i < MAX_SAMPLES; i++)
{
data[i] = (short)(sinf(((2*PI*(float)i)/2)*DEG2RAD)*32000);
}
PlayAudioStream(stream); // Start processing stream buffer (no data loaded currently)
#if defined(PLATFORM_WEB)
emscripten_set_main_loop(UpdateDrawFrame, 0, 1);
#else
SetTargetFPS(60); // Set our game to run at 60 frames-per-second
//--------------------------------------------------------------------------------------
// Main game loop
while (!WindowShouldClose()) // Detect window close button or ESC key
{
UpdateDrawFrame();
}
#endif
// De-Initialization
//--------------------------------------------------------------------------------------
free(data); // Unload sine wave data
CloseAudioStream(stream); // Close raw audio stream and delete buffers from RAM
CloseAudioDevice(); // Close audio device (music streaming is automatically stopped)
CloseWindow(); // Close window and OpenGL context
//--------------------------------------------------------------------------------------
#if !defined(PLATFORM_ANDROID)
return 0;
#endif
}
//----------------------------------------------------------------------------------
// Module Functions Definition
//----------------------------------------------------------------------------------
void UpdateDrawFrame(void)
{
// Update
//----------------------------------------------------------------------------------
// Refill audio stream if required
// NOTE: Every update we check if stream data has been already consumed and we update
// buffer with new data from the generated samples, we upload data at a rate (MAX_SAMPLES_PER_UPDATE),
// but notice that at some point we update < MAX_SAMPLES_PER_UPDATE data...
if (IsAudioBufferProcessed(stream))
{
int numSamples = 0;
if (samplesLeft >= MAX_SAMPLES_PER_UPDATE) numSamples = MAX_SAMPLES_PER_UPDATE;
else numSamples = samplesLeft;
UpdateAudioStream(stream, data + (totalSamples - samplesLeft), numSamples);
samplesLeft -= numSamples;
// Reset samples feeding (loop audio)
if (samplesLeft <= 0) samplesLeft = totalSamples;
}
//----------------------------------------------------------------------------------
// Draw
//----------------------------------------------------------------------------------
BeginDrawing();
ClearBackground(RAYWHITE);
DrawText("SINE WAVE SHOULD BE PLAYING!", 240, 140, 20, LIGHTGRAY);
// NOTE: Draw a part of the sine wave (only screen width, proportional values)
for (int i = 0; i < GetScreenWidth(); i++)
{
position.x = i;
position.y = 250 + 50*data[i]/32000;
DrawPixelV(position, RED);
}
EndDrawing();
//----------------------------------------------------------------------------------
}
|
