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source: orxonox.OLD/orxonox/branches/sound/src/mixer2.cpp @ 3021

Last change on this file since 3021 was 2777, checked in by simon, 20 years ago
/branches/sound: brought up sound_control.cc which doesn't do anything at the moment.
Property svn:executable set to ``*
File size: 4.9 KB

Line
1	#include "SDL.h"
2	#include "SDL_thread.h"
3	#include "SDL_mixer.h"
4
5	#include <stdarg.h>
6	#include <stdlib.h>
7	#include <string.h>
8	#include <stdio.h>
9
10	Sint16 stream[2][4096];
11	int len=4096, done=0, need_refresh=0, bits=0, which=0;
12	SDL_Surface *s=NULL;
13	Uint32 flips=0;
14	Uint32 black,white;
15	float dy,dx;
16
17	/******************************************************************************/
18	/* some simple exit and error routines */
19
20	void errorv(char *str, va_list ap)
21	{
22	vfprintf(stderr,str,ap);
23	fprintf(stderr,": %s.\n", SDL_GetError());
24	}
25
26	void cleanExit(char *str,...)
27	{
28	va_list ap;
29	va_start(ap, str);
30	errorv(str,ap);
31	va_end(ap);
32	Mix_CloseAudio();
33	SDL_Quit();
34	exit(1);
35	}
36
37	/******************************************************************************/
38	/* the postmix processor, only copies the stream buffer and indicates */
39	/* a need for a screen refresh */
40
41	static void postmix(void udata, Uint8 _stream, int _len)
42	{
43	// save the stream buffer and indicate that we need a redraw
44	len=_len;
45	memcpy(stream[(which+1)%2],_stream,len>s->w4?s->w4:len);
46	which=(which+1)%2;
47	need_refresh=1;
48	}
49
50	/******************************************************************************/
51	/* redraw the wav and reset the need_refresh indicator */
52
53	void refresh()
54	{
55	int x,y,Y;
56	Sint16 *buf;
57
58	buf=stream[which];
59	need_refresh=0;
60
61	// clear the screen
62	SDL_FillRect(s,NULL,black);
63
64	// draw the wav from the saved stream buffer
65	Y=s->h/4;
66	for(x=0;x<s->w*2;x++)
67	{
68	y=(buf[x]*dy);
69	{
70	if(y<0)
71	{
72	SDL_Rect r={x/2,Y+y,1,-y};
73	SDL_FillRect(s,&r,white);
74	}
75	else
76	{
77	SDL_Rect r={x/2,Y,1,y};
78	SDL_FillRect(s,&r,white);
79	}
80	}
81	Y=Y>s->h/2?s->h/4:s->h*3/4;
82	}
83	SDL_Flip(s);
84	flips++;
85	}
86
87	/******************************************************************************/
88
89	int main(int argc, char **argv)
90	{
91	int audio_rate,audio_channels,
92	// set this to any of 512,1024,2048,4096
93	// the higher it is, the more FPS shown and CPU needed
94	audio_buffers=512;
95	Uint16 audio_format;
96	Uint32 t;
97	Mix_Music *music;
98	int volume=SDL_MIX_MAXVOLUME;
99
100	// initialize SDL for audio and video
101	if(SDL_Init(SDL_INIT_AUDIO\|SDL_INIT_VIDEO)<0)
102	cleanExit("SDL_Init");
103
104	// open a screen for the wav output
105	//if(!(s=SDL_SetVideoMode(1024,768,0,SDL_FULLSCREEN\|SDL_ANYFORMAT\|SDL_HWSURFACE\|SDL_DOUBLEBUF)))
106	if(!(s=SDL_SetVideoMode(512,512,0,SDL_ANYFORMAT\|SDL_DOUBLEBUF)))
107	cleanExit("SDL_SetVideoMode");
108	SDL_WM_SetCaption("sdlwav - SDL_mixer demo","sdlwav");
109
110	// hide the annoying mouse pointer
111	SDL_ShowCursor(SDL_DISABLE);
112	// get the colors we use
113	white=SDL_MapRGB(s->format,0xff,0xff,0xff);
114	black=SDL_MapRGB(s->format,0,0,0);
115
116	// initialize sdl mixer, open up the audio device
117	if(Mix_OpenAudio(44100,MIX_DEFAULT_FORMAT,2,audio_buffers)<0)
118	cleanExit("Mix_OpenAudio");
119
120	// print out some info on the audio device and stream
121	Mix_QuerySpec(&audio_rate, &audio_format, &audio_channels);
122	bits=audio_format&0xFF;
123	printf("Opened audio at %d Hz %d bit %s, %d bytes audio buffer\n", audio_rate,
124	bits, audio_channels>1?"stereo":"mono", audio_buffers );
125
126	// calculate some parameters for the wav display
127	dy=s->h/2.0/(float)(0x1<<bits);
128	dx=s->w/(float)(0x1<<bits);
129
130	// load the song
131	if(!(music=Mix_LoadMUS(argv[1])))
132	cleanExit("Mix_LoadMUS(\"%s\")",argv[1]);
133
134	// set the post mix processor up
135	Mix_SetPostMix(postmix,argv[1]);
136
137	// start playing and displaying the wav
138	// wait for escape key of the quit event to finish
139	t=SDL_GetTicks();
140	if(Mix_PlayMusic(music, 1)==-1)
141	cleanExit("Mix_PlayMusic(0x%p,1)",music);
142	Mix_VolumeMusic(volume);
143
144	while((Mix_PlayingMusic() \|\| Mix_PausedMusic()) && !done)
145	{
146	SDL_Event e;
147	while(SDL_PollEvent(&e))
148	{
149	switch(e.type)
150	{
151	case SDL_KEYDOWN:
152	switch(e.key.keysym.sym)
153	{
154	case SDLK_ESCAPE:
155	done=1;
156	break;
157	case SDLK_LEFT:
158	Mix_RewindMusic();
159	break;
160	case SDLK_RIGHT:
161	switch(Mix_GetMusicType(NULL))
162	{
163	case MUS_MP3:
164	Mix_SetMusicPosition(+5);
165	break;
166	default:
167	printf("cannot fast-forward this type of music\n");
168	break;
169	}
170	break;
171	case SDLK_UP:
172	volume=(volume+1)<<1;
173	if(volume>SDL_MIX_MAXVOLUME)
174	volume=SDL_MIX_MAXVOLUME;
175	Mix_VolumeMusic(volume);
176	break;
177	case SDLK_DOWN:
178	volume>>=1;
179	Mix_VolumeMusic(volume);
180	break;
181	case SDLK_SPACE:
182	if(Mix_PausedMusic())
183	Mix_ResumeMusic();
184	else
185	Mix_PauseMusic();
186	break;
187	default:
188	break;
189	}
190	break;
191	case SDL_QUIT:
192	done=1;
193	break;
194	default:
195	break;
196	}
197	}
198	// the postmix processor tells us when there's new data to draw
199	if(need_refresh)
200	refresh();
201	else
202	SDL_Delay(0);
203	}
204	t=SDL_GetTicks()-t;
205
206	// free & close
207	Mix_FreeMusic(music);
208	Mix_CloseAudio();
209	SDL_Quit();
210	// show a silly statistic
211	printf("fps=%.2f\n",((float)flips)/(t/1000.0));
212	return(0);
213	}

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