ref: e5fb4a9effa4c42960ebec31cb05a15265a1de45
dir: /src/i_cdmus.c/
// // Copyright(C) 1993-1996 Id Software, Inc. // Copyright(C) 1993-2008 Raven Software // // This program is free software; you can redistribute it and/or // modify it under the terms of the GNU General Public License // as published by the Free Software Foundation; either version 2 // of the License, or (at your option) any later version. // // This program is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // // // SDL implementation of the Hexen CD interface. // #include <stdio.h> #include "SDL.h" #include "SDL_cdrom.h" #include "doomtype.h" #include "i_cdmus.h" static SDL_CD *cd_handle = NULL; static char *startup_error = NULL; static const char *cd_name = NULL; int cd_Error; int I_CDMusInit(void) { int drive_num = 0; // The initialize function is re-invoked when the CD track play cheat // is used, so use the opportunity to call SDL_CDStatus() to update // the status of the drive. if (cd_handle == NULL) { if (SDL_Init(SDL_INIT_CDROM) < 0) { startup_error = "Failed to init CD subsystem."; cd_Error = 1; return -1; } // TODO: config variable to control CDROM to use. cd_handle = SDL_CDOpen(drive_num); if (cd_handle == NULL) { startup_error = "Failed to open CD-ROM drive."; cd_Error = 1; return -1; } cd_name = SDL_CDName(drive_num); } if (SDL_CDStatus(cd_handle) == CD_ERROR) { startup_error = "Failed to read CD status."; cd_Error = 1; return -1; } if (!CD_INDRIVE(cd_handle->status)) { startup_error = "No CD in drive."; cd_Error = 1; return -1; } cd_Error = 0; return 0; } // We cannot print status messages inline during startup, they must // be deferred until after I_CDMusInit has returned. void I_CDMusPrintStartup(void) { if (cd_name != NULL) { printf("I_CDMusInit: Using CD-ROM drive: %s\n", cd_name); } if (startup_error != NULL) { fprintf(stderr, "I_CDMusInit: %s\n", startup_error); } } int I_CDMusPlay(int track) { int result; if (cd_handle == NULL) { cd_Error = 1; return -1; } // Play one track // Track is indexed from 1. result = SDL_CDPlayTracks(cd_handle, track - 1, 0, 1, 0); cd_Error = 0; return result; } int I_CDMusStop(void) { int result; result = SDL_CDStop(cd_handle); cd_Error = 0; return result; } int I_CDMusResume(void) { int result; result = SDL_CDResume(cd_handle); cd_Error = 0; return result; } int I_CDMusSetVolume(int volume) { /* Not supported yet */ cd_Error = 0; return 0; } int I_CDMusFirstTrack(void) { int i; if (cd_handle == NULL) { cd_Error = 1; return -1; } // Find the first audio track. for (i=0; i<cd_handle->numtracks; ++i) { if (cd_handle->track[i].type == SDL_AUDIO_TRACK) { cd_Error = 0; // Tracks are indexed from 1. return i + 1; } } // Don't know? cd_Error = 1; return -1; } int I_CDMusLastTrack(void) { if (cd_handle == NULL) { cd_Error = 1; return -1; } cd_Error = 0; return cd_handle->numtracks; } int I_CDMusTrackLength(int track_num) { SDL_CDtrack *track; if (cd_handle == NULL || track_num < 1 || track_num > cd_handle->numtracks) { cd_Error = 1; return -1; } // Track number is indexed from 1. track = &cd_handle->track[track_num - 1]; // Round up to the next second cd_Error = 0; return (track->length + CD_FPS - 1) / CD_FPS; }