3 * Copyright (C) 1998 Brainchild Design - http://brainchilddesign.com/
5 * Copyright (C) 2001 Chuck Mason <cemason@users.sourceforge.net>
7 * Copyright (C) 2002 Florian Schulze <crow@icculus.org>
9 * Portions of this code are from the MPEG software simulation group
10 * idct implementation. This code will be replaced with a new
11 * implementation soon.
13 * This file is part of Jump'n'Bump.
15 * Jump'n'Bump is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License as published by
17 * the Free Software Foundation; either version 2 of the License, or
18 * (at your option) any later version.
20 * Jump'n'Bump is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
35 #include "SDL_mixer.h"
37 static Mix_Music *current_music = (Mix_Music *) NULL;
40 sfx_data sounds[NUM_SFX];
42 static int SAMPLECOUNT = 512;
44 #define MAX_CHANNELS 32
49 /* The channel step amount... */
51 /* ... and a 0.16 bit remainder of last step. */
52 unsigned int stepremainder;
53 unsigned int samplerate;
54 /* The channel data pointers, start and end. */
56 signed short* startdata;
57 signed short* enddata;
58 /* Hardware left and right channel volume lookup. */
63 channel_info_t channelinfo[MAX_CHANNELS];
65 /* Sample rate in samples/second */
66 int audio_rate = 44100;
67 int global_sfx_volume = 0;
69 // This function loops all active (internal) sound
70 // channels, retrieves a given number of samples
71 // from the raw sound data, modifies it according
72 // to the current (internal) channel parameters,
73 // mixes the per channel samples into the given
74 // mixing buffer, and clamping it to the allowed
77 // This function currently supports only 16bit.
80 static void stopchan(int i)
82 if (channelinfo[i].data) {
83 memset(&channelinfo[i], 0, sizeof(channel_info_t));
89 // This function adds a sound to the
90 // list of currently active sounds,
91 // which is maintained as a given number
92 // (eight, usually) of internal channels.
95 int addsfx(signed short *data, int len, int loop, int samplerate, int channel)
99 /* We will handle the new SFX. */
100 /* Set pointer to raw data. */
101 channelinfo[channel].data = data;
102 channelinfo[channel].startdata = data;
104 /* Set pointer to end of raw data. */
105 channelinfo[channel].enddata = channelinfo[channel].data + len - 1;
106 channelinfo[channel].samplerate = samplerate;
108 channelinfo[channel].loop = loop;
109 channelinfo[channel].stepremainder = 0;
115 static void updateSoundParams(int slot, int volume)
122 // MWM 2000-12-24: Calculates proportion of channel samplerate
123 // to global samplerate for mixing purposes.
124 // Patched to shift left *then* divide, to minimize roundoff errors
125 // as well as to use SAMPLERATE as defined above, not to assume 11025 Hz
127 channelinfo[slot].step = ((channelinfo[slot].samplerate<<16)/audio_rate);
132 /* Sanity check, clamp volume. */
143 channelinfo[slot].leftvol = leftvol;
144 channelinfo[slot].rightvol = rightvol;
148 void mix_sound(void *unused, Uint8 *stream, int len)
150 /* Mix current sound data. */
151 /* Data, from raw sound, for right and left. */
156 /* Pointers in audio stream, left, right, end. */
157 signed short* leftout;
158 signed short* rightout;
159 signed short* leftend;
160 /* Step in stream, left and right, thus two. */
163 /* Mixing channel index. */
166 /* Left and right channel */
167 /* are in audio stream, alternating. */
168 leftout = (signed short *)stream;
169 rightout = ((signed short *)stream)+1;
172 /* Determine end, for left channel only */
173 /* (right channel is implicit). */
174 leftend = leftout + (len/4)*step;
176 /* Mix sounds into the mixing buffer. */
177 /* Loop over step*SAMPLECOUNT, */
178 /* that is 512 values for two channels. */
179 while (leftout != leftend) {
180 /* Reset left/right value. */
182 dr = *rightout * 256;
184 /* Love thy L2 chache - made this a loop. */
185 /* Now more channels could be set at compile time */
186 /* as well. Thus loop those channels. */
187 for ( chan = 0; chan < MAX_CHANNELS; chan++ ) {
188 /* Check channel, if active. */
189 if (channelinfo[chan].data) {
190 /* Get the raw data from the channel. */
192 /* sample = *channelinfo[chan].data; */
193 /* linear filtering */
194 sample = (int)(((int)channelinfo[chan].data[0] * (int)(0x10000 - channelinfo[chan].stepremainder))
195 + ((int)channelinfo[chan].data[1] * (int)(channelinfo[chan].stepremainder))) >> 16;
197 /* Add left and right part */
198 /* for this channel (sound) */
199 /* to the current data. */
200 /* Adjust volume accordingly. */
201 dl += sample * (channelinfo[chan].leftvol * global_sfx_volume) / 128;
202 dr += sample * (channelinfo[chan].rightvol * global_sfx_volume) / 128;
203 /* Increment index ??? */
204 channelinfo[chan].stepremainder += channelinfo[chan].step;
205 /* MSB is next sample??? */
206 channelinfo[chan].data += channelinfo[chan].stepremainder >> 16;
207 /* Limit to LSB??? */
208 channelinfo[chan].stepremainder &= 0xffff;
210 /* Check whether we are done. */
211 if (channelinfo[chan].data >= channelinfo[chan].enddata)
212 if (channelinfo[chan].loop) {
213 channelinfo[chan].data = channelinfo[chan].startdata;
220 /* Clamp to range. Left hardware channel. */
221 /* Has been char instead of short. */
222 /* if (dl > 127) *leftout = 127; */
223 /* else if (dl < -128) *leftout = -128; */
224 /* else *leftout = dl; */
231 else if (dl < SHRT_MIN)
234 *leftout = (signed short)dl;
236 /* Same for right hardware channel. */
238 *rightout = SHRT_MAX;
239 else if (dr < SHRT_MIN)
240 *rightout = SHRT_MIN;
242 *rightout = (signed short)dr;
244 /* Increment current pointers in stream */
254 Uint16 audio_format = AUDIO_S16;
255 int audio_channels = 2;
256 int audio_buffers = 4096;
260 if (main_info.no_sound)
263 audio_buffers = SAMPLECOUNT*audio_rate/11025;
265 memset(channelinfo, 0, sizeof(channelinfo));
266 memset(sounds, 0, sizeof(sounds));
269 if (Mix_OpenAudio(audio_rate, audio_format, audio_channels, audio_buffers) < 0) {
270 fprintf(stderr, "Couldn't open audio: %s\n", SDL_GetError());
271 main_info.no_sound = 1;
275 Mix_QuerySpec(&audio_rate, &audio_format, &audio_channels);
276 printf("Opened audio at %dHz %dbit %s, %d bytes audio buffer\n", audio_rate, (audio_format & 0xFF), (audio_channels > 1) ? "stereo" : "mono", audio_buffers);
278 Mix_SetMusicCMD(getenv("MUSIC_CMD"));
280 Mix_SetPostMix(mix_sound, NULL);
282 main_info.no_sound = 1;
291 if (main_info.no_sound)
297 Mix_FreeMusic(current_music);
298 current_music = NULL;
314 char dj_autodetect_sd(void)
319 char dj_set_stereo(char flag)
324 void dj_set_auto_mix(char flag)
328 unsigned short dj_set_mixing_freq(unsigned short freq)
333 void dj_set_dma_time(unsigned short time)
337 void dj_set_nosound(char flag)
349 char dj_set_num_sfx_channels(char num_channels)
354 void dj_set_sfx_volume(char volume)
356 if (main_info.no_sound)
360 global_sfx_volume = volume*2;
364 void dj_play_sfx(unsigned char sfx_num, unsigned short freq, char volume, char panning, unsigned short delay, char channel)
368 if (main_info.music_no_sound || main_info.no_sound)
372 for (slot=0; slot<MAX_CHANNELS; slot++)
373 if (channelinfo[slot].data==NULL)
375 if (slot>=MAX_CHANNELS)
381 addsfx((short *)sounds[sfx_num].buf, sounds[sfx_num].length, sounds[sfx_num].loop, freq, slot);
382 updateSoundParams(slot, volume*2);
386 char dj_get_sfx_settings(unsigned char sfx_num, sfx_data *data)
388 if (main_info.no_sound)
391 memcpy(data, &sounds[sfx_num], sizeof(sfx_data));
395 char dj_set_sfx_settings(unsigned char sfx_num, sfx_data *data)
397 if (main_info.no_sound)
400 memcpy(&sounds[sfx_num], data, sizeof(sfx_data));
404 void dj_set_sfx_channel_volume(char channel_num, char volume)
406 if (main_info.no_sound)
410 updateSoundParams(channel_num, volume*2);
414 void dj_stop_sfx_channel(char channel_num)
416 if (main_info.no_sound)
420 stopchan(channel_num);
424 char dj_load_sfx(unsigned char * file_handle, char *filename, int file_length, char sfx_type, unsigned char sfx_num)
428 unsigned short *dest;
430 if (main_info.no_sound)
433 sounds[sfx_num].buf = malloc(file_length);
435 memcpy(sounds[sfx_num].buf, file_handle, file_length);
437 sounds[sfx_num].length = file_length / 2;
438 src = sounds[sfx_num].buf;
439 dest = (unsigned short *)sounds[sfx_num].buf;
440 for (i=0; i<sounds[sfx_num].length; i++)
443 temp = src[0] + (src[1] << 8);
451 void dj_free_sfx(unsigned char sfx_num)
453 if (main_info.no_sound)
456 free(sounds[sfx_num].buf);
457 memset(&sounds[sfx_num], 0, sizeof(sfx_data));
462 char dj_ready_mod(char mod_num)
466 # if ((defined _MSC_VER) || (defined __MINGW32__))
467 char filename[] = "jnb.tmpmusic.mod";
469 char filename[] = "/tmp/jnb.tmpmusic.mod";
474 if (main_info.no_sound)
479 fp = dat_open("jump.mod", datfile_name, "rb");
480 len = dat_filelen("jump.mod", datfile_name);
483 fp = dat_open("bump.mod", datfile_name, "rb");
484 len = dat_filelen("bump.mod", datfile_name);
487 fp = dat_open("scores.mod", datfile_name, "rb");
488 len = dat_filelen("scores.mod", datfile_name);
494 if (Mix_PlayingMusic())
495 Mix_FadeOutMusic(1500);
498 Mix_FreeMusic(current_music);
499 current_music = NULL;
506 tmp = fopen(filename, "wb");
508 fwrite(fp, len, 1, tmp);
513 current_music = Mix_LoadMUS(filename);
515 if (current_music == NULL) {
516 fprintf(stderr, "Couldn't load music: %s\n", SDL_GetError());
525 char dj_start_mod(void)
528 if (main_info.no_sound)
532 Mix_PlayMusic(current_music, -1);
538 void dj_stop_mod(void)
541 if (main_info.no_sound)
548 void dj_set_mod_volume(char volume)
551 if (main_info.no_sound)
554 Mix_VolumeMusic(volume);
558 char dj_load_mod(unsigned char * file_handle, char *filename, char mod_num)
563 void dj_free_mod(char mod_num)