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Diffstat (limited to 'examples/web/audio/audio_raw_stream.c')
| -rw-r--r-- | examples/web/audio/audio_raw_stream.c | 184 |
1 files changed, 0 insertions, 184 deletions
diff --git a/examples/web/audio/audio_raw_stream.c b/examples/web/audio/audio_raw_stream.c deleted file mode 100644 index aeb16ba..0000000 --- a/examples/web/audio/audio_raw_stream.c +++ /dev/null @@ -1,184 +0,0 @@ -/******************************************************************************************* -* -* raylib [audio] example - Raw audio streaming -* -* 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) -* -* Example created by Ramon Santamaria (@raysan5) and reviewed by James Hofmann (@triplefox) -* -* Copyright (c) 2015-2019 Ramon Santamaria (@raysan5) and James Hofmann (@triplefox) -* -********************************************************************************************/ - -#include "raylib.h" - -#if defined(PLATFORM_WEB) - #include <emscripten/emscripten.h> -#endif - -#include <stdlib.h> // Required for: malloc(), free() -#include <math.h> // Required for: sinf() -#include <string.h> // Required for: memcpy() - -#define MAX_SAMPLES 512 -#define MAX_SAMPLES_PER_UPDATE 4096 - -//---------------------------------------------------------------------------------- -// Global Variables Definition -//---------------------------------------------------------------------------------- -const int screenWidth = 800; -const int screenHeight = 450; - -AudioStream stream = { 0 }; -short *data; -short *writeBuf; - -Vector2 mousePosition = { -100.0f, -100.0f }; -float frequency = 440.0f; -float oldFrequency = 1.0f; -int readCursor = 0; -int waveLength = 1; -Vector2 position = { 0, 0 }; - -//---------------------------------------------------------------------------------- -// Module Functions Declaration -//---------------------------------------------------------------------------------- -void UpdateDrawFrame(void); // Update and Draw one frame - -//---------------------------------------------------------------------------------- -// Program Main Entry Point -//---------------------------------------------------------------------------------- -int main(void) -{ - // Initialization - //-------------------------------------------------------------------------------------- - 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) - stream = InitAudioStream(22050, 16, 1); - - // Buffer for the single cycle waveform we are synthesizing - data = (short *)malloc(sizeof(short)*MAX_SAMPLES); - - // Frame buffer, describing the waveform when repeated over the course of a frame - writeBuf = (short *)malloc(sizeof(short)*MAX_SAMPLES_PER_UPDATE); - - PlayAudioStream(stream); // Start processing stream buffer (no data loaded currently) - -#if defined(PLATFORM_WEB) - emscripten_set_main_loop(UpdateDrawFrame, 60, 1); -#else - SetTargetFPS(30); // Set our game to run at 30 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 - free(writeBuf); // Unload write buffer - - 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; -} - -//---------------------------------------------------------------------------------- -// Module Functions Definition -//---------------------------------------------------------------------------------- -void UpdateDrawFrame(void) -{ - // Update - //---------------------------------------------------------------------------------- - mousePosition = GetMousePosition(); - - if (IsMouseButtonDown(MOUSE_LEFT_BUTTON)) - { - float fp = (float)(mousePosition.y); - frequency = 40.0f + (float)(fp); - } - - // Rewrite the sine wave. - // Compute two cycles to allow the buffer padding, simplifying any modulation, resampling, etc. - if (frequency != oldFrequency) - { - // Compute wavelength. Limit size in both directions. - int oldWavelength = waveLength; - waveLength = (int)(22050/frequency); - if (waveLength > MAX_SAMPLES/2) waveLength = MAX_SAMPLES/2; - if (waveLength < 1) waveLength = 1; - - // Write sine wave. - for (int i = 0; i < waveLength*2; i++) - { - data[i] = (short)(sinf(((2*PI*(float)i/waveLength)))*32000); - } - - // Scale read cursor's position to minimize transition artifacts - readCursor = (int)(readCursor * ((float)waveLength / (float)oldWavelength)); - oldFrequency = frequency; - } - - // Refill audio stream if required - if (IsAudioStreamProcessed(stream)) - { - // Synthesize a buffer that is exactly the requested size - int writeCursor = 0; - - while (writeCursor < MAX_SAMPLES_PER_UPDATE) - { - // Start by trying to write the whole chunk at once - int writeLength = MAX_SAMPLES_PER_UPDATE-writeCursor; - - // Limit to the maximum readable size - int readLength = waveLength-readCursor; - - if (writeLength > readLength) writeLength = readLength; - - // Write the slice - memcpy(writeBuf + writeCursor, data + readCursor, writeLength*sizeof(short)); - - // Update cursors and loop audio - readCursor = (readCursor + writeLength) % waveLength; - - writeCursor += writeLength; - } - - // Copy finished frame to audio stream - UpdateAudioStream(stream, writeBuf, MAX_SAMPLES_PER_UPDATE); - } - //---------------------------------------------------------------------------------- - - // Draw - //---------------------------------------------------------------------------------- - BeginDrawing(); - - ClearBackground(RAYWHITE); - - DrawText(TextFormat("sine frequency: %i",(int)frequency), GetScreenWidth() - 220, 10, 20, RED); - DrawText("click mouse button to change frequency", 10, 10, 20, DARKGRAY); - - // Draw the current buffer state proportionate to the screen - for (int i = 0; i < screenWidth; i++) - { - position.x = i; - position.y = 250 + 50*data[i*MAX_SAMPLES/screenWidth]/32000; - - DrawPixelV(position, RED); - } - - EndDrawing(); - //---------------------------------------------------------------------------------- -}
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