horrible first step in producing audio with SDL_mixer from a nodejs a…

…ddon

README

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+node-sdlmixer experiment
+
+This is an experiment to get sdlmixer working together with nodejs.
+
+Note: since I am completely new to nodejs addon development, this
+is currently a very bad example of coding it.
+
+

node-sdlmixer.cc

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+#include <v8.h>
+#include "SDL.h"
+#include "SDL_mixer.h"
+
+using namespace v8;
+
+static int still_playing(void)
+{
+  return(Mix_Playing(0));
+}
+
+
+extern "C" void
+init (Handle<Object> target)
+{
+  HandleScope scope;
+  target->Set(String::New("hello"), String::New("world"));
+
+  /* Initialize the SDL library */
+  if ( SDL_Init(SDL_INIT_AUDIO) < 0 ) {
+    fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());
+    return ;
+  }
+
+  int audio_rate;
+  Uint16 audio_format;
+  int audio_channels;
+  Mix_Chunk *wave = NULL;
+
+
+  /* Initialize variables */
+  audio_rate = MIX_DEFAULT_FREQUENCY;
+  audio_format = MIX_DEFAULT_FORMAT;
+  audio_channels = 2;
+
+  /* Open the audio device */
+  if (Mix_OpenAudio(audio_rate, audio_format, audio_channels, 4096) < 0) {
+    fprintf(stderr, "Couldn't open audio: %s\n", SDL_GetError());
+  }
+  else {
+    Mix_QuerySpec(&audio_rate, &audio_format, &audio_channels);
+    printf("Opened audio at %d Hz %d bit %s\n", audio_rate,
+			(audio_format&0xFF),
+			(audio_channels > 2) ? "surround" :
+			(audio_channels > 1) ? "stereo" : "mono");
+
+    /* Load the requested wave file */
+    wave = Mix_LoadWAV("./wavs/alarm.wav");
+
+    /* Play and then exit */
+    Mix_PlayChannel(0, wave, 0);
+
+    while (still_playing()) {
+      SDL_Delay(1);
+
+    } /* while still_playing() loop... */
+
+
+  }
+}

test.js

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+var sdlmixer = require("./build/default/node-sdlmixer"),
+         sys = require("sys"),
+        puts = sys.puts;
+
+puts(sdlmixer.hello);
+

wscript

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+from os import popen
+
+srcdir = '.'
+blddir = 'build'
+VERSION = '0.0.1'
+
+def set_options(opt):
+  opt.tool_options('compiler_cxx')
+
+def configure(conf):
+  conf.check_tool('compiler_cxx')
+  conf.check_tool('node_addon')
+
+  sdl_config = conf.find_program('sdl-config', var='SDL_CONFIG', mandatory=True)
+  sdl_libs = popen("%s --libs" % sdl_config).readline().strip()
+  sdl_cflags = popen("%s --cflags" % sdl_config).readline().strip()
+
+  sdl_addpaths = []
+  sdl_addlibs = []
+  for item in sdl_libs.split(' '):
+    # -L items are lib paths, -l are additional libraries
+    if item.find("-L") == 0:
+      sdl_addpaths.append(item[2:])
+    if item.find("-l") == 0:
+      sdl_addlibs.append(item[2:])
+
+  sdl_addlibs.append("SDL_mixer")
+
+  conf.env.append_value("LIBPATH_SDL", sdl_addpaths)
+  conf.env.append_value("LIB_SDL", sdl_addlibs)
+
+  conf.env.append_value("CPPFLAGS_SDL", sdl_cflags.split(' '))
+
+def build(bld):
+  obj = bld.new_task_gen('cxx', 'shlib', 'node_addon')
+  obj.target = 'node-sdlmixer'
+  obj.source = 'node-sdlmixer.cc'
+  obj.uselib = "SDL"