322 lines
6.1 KiB
C++
322 lines
6.1 KiB
C++
/*
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*
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* SDL CD Audio functions
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*
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <SDL.h>
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#ifdef __linux__
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#include <sys/ioctl.h>
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#include <linux/cdrom.h>
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#endif
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#include "pstypes.h"
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#include "dxxerror.h"
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#include "args.h"
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#include "rbaudio.h"
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#include "console.h"
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#include "timer.h"
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#define REDBOOK_VOLUME_SCALE 255
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static SDL_CD *s_cd = NULL;
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static int initialised = 0;
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void RBAExit()
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{
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if (s_cd)
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{
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SDL_CDStop(s_cd);
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SDL_CDClose(s_cd);
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}
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}
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void RBAInit()
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{
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int num_cds;
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int i,j;
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if (initialised) return;
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if (SDL_Init(SDL_INIT_CDROM) < 0)
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{
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Warning("RBAudio: SDL library initialisation failed: %s.",SDL_GetError());
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return;
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}
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num_cds = SDL_CDNumDrives();
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if (num_cds < 1)
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{
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con_printf(CON_NORMAL, "RBAudio: No cdrom drives found!\n");
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#if defined(__APPLE__) || defined(macintosh)
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SDL_QuitSubSystem(SDL_INIT_CDROM); // necessary for rescanning CDROMs
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#endif
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return;
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}
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for (i = 0; i < num_cds; i++)
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{
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if (s_cd)
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SDL_CDClose(s_cd);
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s_cd = SDL_CDOpen(i);
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if (s_cd && CD_INDRIVE(SDL_CDStatus(s_cd)))
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{
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for (j = 0; j < s_cd->numtracks; j++)
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{
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if (s_cd->track[j].type == SDL_AUDIO_TRACK)
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break;
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}
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if (j != s_cd->numtracks)
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break; // we've found an audio CD
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}
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else if (s_cd == NULL)
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Warning("RBAudio: Could not open cdrom %i for redbook audio:%s\n", i, SDL_GetError());
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}
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if (i == num_cds)
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{
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con_printf(CON_NORMAL, "RBAudio: No audio CDs found\n");
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if (s_cd) // if there's no audio CD, say that there's no redbook and hence play MIDI instead
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{
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SDL_CDClose(s_cd);
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s_cd = NULL;
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}
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#if defined(__APPLE__) || defined(macintosh)
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SDL_QuitSubSystem(SDL_INIT_CDROM); // necessary for rescanning CDROMs
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#endif
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return;
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}
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initialised = 1;
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RBAList();
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}
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int RBAEnabled()
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{
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return initialised;
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}
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int RBAPlayTrack(int a)
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{
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if (!s_cd) return -1;
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if (CD_INDRIVE(SDL_CDStatus(s_cd)) ) {
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if (SDL_CDPlayTracks(s_cd, a-1, 0, 0, 0) == 0)
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{
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con_printf(CON_VERBOSE, "RBAudio: Playing track %i\n", a);
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return a;
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}
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}
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return -1;
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}
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static void (*redbook_finished_hook)() = NULL;
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void RBAStop()
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{
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if (!s_cd) return;
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SDL_CDStop(s_cd);
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redbook_finished_hook = NULL; // no calling the finished hook - stopped means stopped here
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con_printf(CON_VERBOSE, "RBAudio: Playback stopped\n");
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}
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void RBAEjectDisk()
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{
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if (!s_cd) return;
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SDL_CDEject(s_cd); // play nothing until it tries to load a song
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#if defined(__APPLE__) || defined(macintosh)
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SDL_QuitSubSystem(SDL_INIT_CDROM); // necessary for rescanning CDROMs
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#endif
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initialised = 0;
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}
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void RBASetVolume(int volume)
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{
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#ifdef __linux__
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int cdfile, level;
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struct cdrom_volctrl volctrl;
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if (!s_cd) return;
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cdfile = s_cd->id;
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level = volume*REDBOOK_VOLUME_SCALE/8;
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if ((level<0) || (level>REDBOOK_VOLUME_SCALE)) {
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con_printf(CON_CRITICAL, "RBAudio: illegal volume value (allowed values 0-%i)\n",REDBOOK_VOLUME_SCALE);
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return;
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}
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volctrl.channel0
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= volctrl.channel1
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= volctrl.channel2
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= volctrl.channel3
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= level;
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if ( ioctl(cdfile, CDROMVOLCTRL, &volctrl) == -1 ) {
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con_printf(CON_CRITICAL, "RBAudio: CDROMVOLCTRL ioctl failed\n");
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return;
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}
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#endif
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}
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void RBAPause()
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{
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if (!s_cd) return;
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SDL_CDPause(s_cd);
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con_printf(CON_VERBOSE, "RBAudio: Playback paused\n");
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}
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int RBAResume()
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{
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if (!s_cd) return -1;
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SDL_CDResume(s_cd);
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con_printf(CON_VERBOSE, "RBAudio: Playback resumed\n");
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return 1;
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}
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int RBAPauseResume()
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{
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if (!s_cd) return 0;
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if (SDL_CDStatus(s_cd) == CD_PLAYING)
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{
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SDL_CDPause(s_cd);
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con_printf(CON_VERBOSE, "RBAudio: Toggle Playback pause\n");
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}
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else if (SDL_CDStatus(s_cd) == CD_PAUSED)
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{
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SDL_CDResume(s_cd);
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con_printf(CON_VERBOSE, "RBAudio: Toggle Playback resume\n");
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}
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else
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return 0;
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return 1;
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}
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int RBAGetNumberOfTracks()
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{
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if (!s_cd) return -1;
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SDL_CDStatus(s_cd);
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con_printf(CON_VERBOSE, "RBAudio: Found %i tracks on CD\n", s_cd->numtracks);
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return s_cd->numtracks;
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}
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// check if we need to call the 'finished' hook
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// needs to go in all event loops
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// a real hook would be ideal, but is currently unsupported by SDL Audio CD
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void RBACheckFinishedHook()
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{
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static fix64 last_check_time = 0;
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if (!s_cd) return;
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if ((timer_query() - last_check_time) >= F2_0)
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{
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if ((SDL_CDStatus(s_cd) == CD_STOPPED) && redbook_finished_hook)
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{
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con_printf(CON_VERBOSE, "RBAudio: Playback done, calling finished-hook\n");
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redbook_finished_hook();
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}
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last_check_time = timer_query();
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}
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}
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// plays tracks first through last, inclusive
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int RBAPlayTracks(int first, int last, void (*hook_finished)(void))
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{
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if (!s_cd)
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return 0;
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if (CD_INDRIVE(SDL_CDStatus(s_cd)))
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{
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redbook_finished_hook = hook_finished;
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con_printf(CON_VERBOSE, "RBAudio: Playing tracks %i to %i\n", first, last);
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return SDL_CDPlayTracks(s_cd, first - 1, 0, last - first + 1, 0) == 0;
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}
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return 0;
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}
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// return the track number currently playing. Useful if RBAPlayTracks()
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// is called. Returns 0 if no track playing, else track number
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int RBAGetTrackNum()
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{
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if (!s_cd)
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return 0;
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if (SDL_CDStatus(s_cd) != CD_PLAYING)
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return 0;
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return s_cd->cur_track + 1;
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}
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int RBAPeekPlayStatus()
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{
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if (!s_cd)
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return 0;
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if (SDL_CDStatus(s_cd) == CD_PLAYING)
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return 1;
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else if (SDL_CDStatus(s_cd) == CD_PAUSED) // hack so it doesn't keep restarting paused music
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return -1;
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return 0;
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}
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static int cddb_sum(int n)
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{
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int ret;
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/* For backward compatibility this algorithm must not change */
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ret = 0;
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while (n > 0) {
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ret = ret + (n % 10);
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n = n / 10;
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}
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return (ret);
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}
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unsigned long RBAGetDiscID()
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{
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int i, t = 0, n = 0;
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if (!s_cd)
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return 0;
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/* For backward compatibility this algorithm must not change */
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i = 0;
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while (i < s_cd->numtracks) {
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n += cddb_sum(s_cd->track[i].offset / CD_FPS);
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i++;
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}
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t = (s_cd->track[s_cd->numtracks].offset / CD_FPS) -
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(s_cd->track[0].offset / CD_FPS);
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return ((n % 0xff) << 24 | t << 8 | s_cd->numtracks);
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}
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void RBAList(void)
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{
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int i;
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if (!s_cd)
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return;
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for (i = 0; i < s_cd->numtracks; i++)
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con_printf(CON_VERBOSE, "RBAudio: CD track %d, type %s, length %d, offset %d", s_cd->track[i].id, (s_cd->track[i].type == SDL_AUDIO_TRACK) ? "audio" : "data", s_cd->track[i].length, s_cd->track[i].offset);
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}
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