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source: orxonox.OLD/orxonox/branches/sound/src/sdlwav.c @ 2780

Last change on this file since 2780 was 2777, checked in by simon, 20 years ago
/branches/sound: brought up sound_control.cc which doesn't do anything at the moment.
File size: 5.0 KB

Line
1	#include "SDL.h"
2	#include "SDL_thread.h"
3	#include "SDL_mixer.h"
4
5	#include <stdarg.h>
6	#include <unistd.h>
7	#include <stdlib.h>
8	#include <string.h>
9	#include <stdio.h>
10
11	Sint16 stream[2][4096];
12	int len=4096, done=0, need_refresh=0, bits=0, which=0;
13	SDL_Surface *s=NULL;
14	Uint32 flips=0;
15	Uint32 black,white;
16	float dy,dx;
17
18	/******************************************************************************/
19	/* some simple exit and error routines */
20
21	void errorv(char *str, va_list ap)
22	{
23	vfprintf(stderr,str,ap);
24	fprintf(stderr,": %s.\n", SDL_GetError());
25	}
26
27	void cleanExit(char *str,...)
28	{
29	va_list ap;
30	va_start(ap, str);
31	errorv(str,ap);
32	va_end(ap);
33	Mix_CloseAudio();
34	SDL_Quit();
35	exit(1);
36	}
37
38	/******************************************************************************/
39	/* the postmix processor, only copies the stream buffer and indicates */
40	/* a need for a screen refresh */
41
42	static void postmix(void udata, Uint8 _stream, int _len)
43	{
44	// save the stream buffer and indicate that we need a redraw
45	len=_len;
46	memcpy(stream[(which+1)%2],_stream,len>s->w4?s->w4:len);
47	which=(which+1)%2;
48	need_refresh=1;
49	}
50
51	/******************************************************************************/
52	/* redraw the wav and reset the need_refresh indicator */
53
54	void refresh()
55	{
56	int x,y,Y;
57	Sint16 *buf;
58
59	buf=stream[which];
60	need_refresh=0;
61
62	// clear the screen
63	SDL_FillRect(s,NULL,black);
64
65	// draw the wav from the saved stream buffer
66	Y=s->h/4;
67	for(x=0;x<s->w*2;x++)
68	{
69	y=(buf[x]*dy);
70	{
71	if(y<0)
72	{
73	SDL_Rect r={x/2,Y+y,1,-y};
74	SDL_FillRect(s,&r,white);
75	}
76	else
77	{
78	SDL_Rect r={x/2,Y,1,y};
79	SDL_FillRect(s,&r,white);
80	}
81	}
82	Y=Y>s->h/2?s->h/4:s->h*3/4;
83	}
84	SDL_Flip(s);
85	flips++;
86	}
87
88	/******************************************************************************/
89
90	int main(int argc, char **argv)
91	{
92	int audio_rate,audio_channels,
93	// set this to any of 512,1024,2048,4096
94	// the higher it is, the more FPS shown and CPU needed
95	audio_buffers=512;
96	Uint16 audio_format;
97	Uint32 t;
98	Mix_Music *music;
99	int volume=SDL_MIX_MAXVOLUME;
100
101	// initialize SDL for audio and video
102	if(SDL_Init(SDL_INIT_AUDIO\|SDL_INIT_VIDEO)<0)
103	cleanExit("SDL_Init");
104
105	// open a screen for the wav output
106	//if(!(s=SDL_SetVideoMode(1024,768,0,SDL_FULLSCREEN\|SDL_ANYFORMAT\|SDL_HWSURFACE\|SDL_DOUBLEBUF)))
107	if(!(s=SDL_SetVideoMode(512,512,0,SDL_ANYFORMAT\|SDL_DOUBLEBUF)))
108	cleanExit("SDL_SetVideoMode");
109	SDL_WM_SetCaption("sdlwav - SDL_mixer demo","sdlwav");
110
111	// hide the annoying mouse pointer
112	SDL_ShowCursor(SDL_DISABLE);
113	// get the colors we use
114	white=SDL_MapRGB(s->format,0xff,0xff,0xff);
115	black=SDL_MapRGB(s->format,0,0,0);
116
117	// initialize sdl mixer, open up the audio device
118	if(Mix_OpenAudio(44100,MIX_DEFAULT_FORMAT,2,audio_buffers)<0)
119	cleanExit("Mix_OpenAudio");
120
121	// print out some info on the audio device and stream
122	Mix_QuerySpec(&audio_rate, &audio_format, &audio_channels);
123	bits=audio_format&0xFF;
124	printf("Opened audio at %d Hz %d bit %s, %d bytes audio buffer\n", audio_rate,
125	bits, audio_channels>1?"stereo":"mono", audio_buffers );
126
127	// calculate some parameters for the wav display
128	dy=s->h/2.0/(float)(0x1<<bits);
129	dx=s->w/(float)(0x1<<bits);
130
131	// load the song
132	if(!(music=Mix_LoadMUS(argv[1])))
133	cleanExit("Mix_LoadMUS(\"%s\")",argv[1]);
134
135	// set the post mix processor up
136	Mix_SetPostMix(postmix,argv[1]);
137
138	// start playing and displaying the wav
139	// wait for escape key of the quit event to finish
140	t=SDL_GetTicks();
141	if(Mix_PlayMusic(music, 1)==-1)
142	cleanExit("Mix_PlayMusic(0x%p,1)",music);
143	Mix_VolumeMusic(volume);
144
145	while((Mix_PlayingMusic() \|\| Mix_PausedMusic()) && !done)
146	{
147	SDL_Event e;
148	while(SDL_PollEvent(&e))
149	{
150	switch(e.type)
151	{
152	case SDL_KEYDOWN:
153	switch(e.key.keysym.sym)
154	{
155	case SDLK_ESCAPE:
156	done=1;
157	break;
158	case SDLK_LEFT:
159	Mix_RewindMusic();
160	break;
161	case SDLK_RIGHT:
162	switch(Mix_GetMusicType(NULL))
163	{
164	case MUS_MP3:
165	Mix_SetMusicPosition(+5);
166	break;
167	default:
168	printf("cannot fast-forward this type of music\n");
169	break;
170	}
171	break;
172	case SDLK_UP:
173	volume=(volume+1)<<1;
174	if(volume>SDL_MIX_MAXVOLUME)
175	volume=SDL_MIX_MAXVOLUME;
176	Mix_VolumeMusic(volume);
177	break;
178	case SDLK_DOWN:
179	volume>>=1;
180	Mix_VolumeMusic(volume);
181	break;
182	case SDLK_SPACE:
183	if(Mix_PausedMusic())
184	Mix_ResumeMusic();
185	else
186	Mix_PauseMusic();
187	break;
188	default:
189	break;
190	}
191	break;
192	case SDL_QUIT:
193	done=1;
194	break;
195	default:
196	break;
197	}
198	}
199	// the postmix processor tells us when there's new data to draw
200	if(need_refresh)
201	refresh();
202	else
203	SDL_Delay(0);
204	}
205	t=SDL_GetTicks()-t;
206
207	// free & close
208	Mix_FreeMusic(music);
209	Mix_CloseAudio();
210	SDL_Quit();
211	// show a silly statistic
212	printf("fps=%.2f\n",((float)flips)/(t/1000.0));
213	return(0);
214	}

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