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Diffstat (limited to 'examples/src/audio/audio_raw_stream.c')
| -rw-r--r-- | examples/src/audio/audio_raw_stream.c | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/examples/src/audio/audio_raw_stream.c b/examples/src/audio/audio_raw_stream.c new file mode 100644 index 0000000..80c83e9 --- /dev/null +++ b/examples/src/audio/audio_raw_stream.c @@ -0,0 +1,114 @@ +/******************************************************************************************* +* +* 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" + +#include <stdlib.h> // Required for: malloc(), free() +#include <math.h> // Required for: sinf() + +#define MAX_SAMPLES 22050 +#define MAX_SAMPLES_PER_UPDATE 4096 + +int main() +{ + // Initialization + //-------------------------------------------------------------------------------------- + int screenWidth = 800; + int screenHeight = 450; + + InitWindow(screenWidth, screenHeight, "raylib [audio] example - raw audio streaming"); + + InitAudioDevice(); // Initialize audio device + + // Init raw audio stream (sample rate: 22050, sample size: 16bit-short, channels: 1-mono) + AudioStream stream = InitAudioStream(22050, 16, 1); + + // Generate samples data from sine wave + short *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) + + int totalSamples = MAX_SAMPLES; + int samplesLeft = totalSamples; + + Vector2 position = { 0, 0 }; + + SetTargetFPS(30); // Set our game to run at 30 frames-per-second + //-------------------------------------------------------------------------------------- + + // Main game loop + while (!WindowShouldClose()) // Detect window close button or ESC key + { + // 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(); + //---------------------------------------------------------------------------------- + } + + // 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 + //-------------------------------------------------------------------------------------- + + return 0; +}
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