src/cdrom/SDL_cdrom.c
author Darren Alton <dalton@stevens.edu>
Thu, 21 Aug 2008 12:38:21 +0000
branchgsoc2008_nds
changeset 2697 c9121b04cffa
parent 1978 542c78b6fb12
child 2698 e1da92da346c
permissions -rw-r--r--
Some more work on the audio driver.
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2006 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Lesser General Public
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    License as published by the Free Software Foundation; either
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    version 2.1 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Lesser General Public License for more details.
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    You should have received a copy of the GNU Lesser General Public
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    License along with this library; if not, write to the Free Software
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    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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#include "SDL_config.h"
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/* This is the CD-audio control API for Simple DirectMedia Layer */
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#include "SDL_cdrom.h"
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#include "SDL_syscdrom.h"
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#define CLIP_FRAMES	10      /* Some CD-ROMs won't go all the way */
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static int SDL_cdinitted = 0;
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static SDL_CD *default_cdrom;
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/* The system level CD-ROM control functions */
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struct CDcaps SDL_CDcaps = {
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    NULL,                       /* Name */
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    NULL,                       /* Open */
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    NULL,                       /* GetTOC */
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    NULL,                       /* Status */
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    NULL,                       /* Play */
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    NULL,                       /* Pause */
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    NULL,                       /* Resume */
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    NULL,                       /* Stop */
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    NULL,                       /* Eject */
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    NULL,                       /* Close */
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};
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int SDL_numcds;
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int
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SDL_CDROMInit(void)
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{
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    int retval;
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    SDL_numcds = 0;
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    retval = SDL_SYS_CDInit();
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    if (retval == 0) {
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        SDL_cdinitted = 1;
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    }
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    default_cdrom = NULL;
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    return (retval);
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}
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/* Check to see if the CD-ROM subsystem has been initialized */
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static int
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CheckInit(int check_cdrom, SDL_CD ** cdrom)
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{
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    int okay;
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    okay = SDL_cdinitted;
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    if (check_cdrom && (*cdrom == NULL)) {
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        *cdrom = default_cdrom;
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        if (*cdrom == NULL) {
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            SDL_SetError("CD-ROM not opened");
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            okay = 0;
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        }
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    }
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    if (!SDL_cdinitted) {
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        SDL_SetError("CD-ROM subsystem not initialized");
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    }
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    return (okay);
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}
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int
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SDL_CDNumDrives(void)
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{
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    if (!CheckInit(0, NULL)) {
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        return (-1);
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    }
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    return (SDL_numcds);
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}
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const char *
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SDL_CDName(int drive)
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{
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    if (!CheckInit(0, NULL)) {
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        return (NULL);
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    }
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    if (drive >= SDL_numcds) {
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        SDL_SetError("Invalid CD-ROM drive index");
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        return (NULL);
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    }
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    if (SDL_CDcaps.Name) {
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        return (SDL_CDcaps.Name(drive));
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    } else {
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        return ("");
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    }
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}
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SDL_CD *
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SDL_CDOpen(int drive)
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{
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    struct SDL_CD *cdrom;
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    if (!CheckInit(0, NULL)) {
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        return (NULL);
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    }
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    if (drive >= SDL_numcds) {
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        SDL_SetError("Invalid CD-ROM drive index");
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        return (NULL);
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    }
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    cdrom = (SDL_CD *) SDL_malloc(sizeof(*cdrom));
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    if (cdrom == NULL) {
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        SDL_OutOfMemory();
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        return (NULL);
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    }
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    SDL_memset(cdrom, 0, sizeof(*cdrom));
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    cdrom->id = SDL_CDcaps.Open(drive);
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    if (cdrom->id < 0) {
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        SDL_free(cdrom);
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        return (NULL);
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    }
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    default_cdrom = cdrom;
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    return (cdrom);
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}
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CDstatus
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SDL_CDStatus(SDL_CD * cdrom)
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{
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    CDstatus status;
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    int i;
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    Uint32 position;
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    /* Check if the CD-ROM subsystem has been initialized */
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    if (!CheckInit(1, &cdrom)) {
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        return (CD_ERROR);
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    }
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    /* Get the current status of the drive */
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    cdrom->numtracks = 0;
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    cdrom->cur_track = 0;
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    cdrom->cur_frame = 0;
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    status = SDL_CDcaps.Status(cdrom, &i);
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    position = (Uint32) i;
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    cdrom->status = status;
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    /* Get the table of contents, if there's a CD available */
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    if (CD_INDRIVE(status)) {
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        if (SDL_CDcaps.GetTOC(cdrom) < 0) {
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            status = CD_ERROR;
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        }
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        /* If the drive is playing, get current play position */
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        if ((status == CD_PLAYING) || (status == CD_PAUSED)) {
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            for (i = 1; cdrom->track[i].offset <= position; ++i) {
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                /* Keep looking */ ;
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            }
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#ifdef DEBUG_CDROM
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            fprintf(stderr,
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                    "Current position: %d, track = %d (offset is %d)\n",
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                    position, i - 1, cdrom->track[i - 1].offset);
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#endif
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            cdrom->cur_track = i - 1;
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            position -= cdrom->track[cdrom->cur_track].offset;
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            cdrom->cur_frame = position;
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   174
        }
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    }
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    return (status);
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}
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int
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SDL_CDPlayTracks(SDL_CD * cdrom,
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                 int strack, int sframe, int ntracks, int nframes)
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{
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    int etrack, eframe;
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    int start, length;
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    /* Check if the CD-ROM subsystem has been initialized */
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    if (!CheckInit(1, &cdrom)) {
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        return (CD_ERROR);
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    }
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    /* Determine the starting and ending tracks */
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    if ((strack < 0) || (strack >= cdrom->numtracks)) {
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        SDL_SetError("Invalid starting track");
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        return (CD_ERROR);
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   195
    }
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    if (!ntracks && !nframes) {
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        etrack = cdrom->numtracks;
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        eframe = 0;
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   199
    } else {
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        etrack = strack + ntracks;
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        if (etrack == strack) {
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            eframe = sframe + nframes;
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        } else {
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            eframe = nframes;
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        }
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   206
    }
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   207
    if (etrack > cdrom->numtracks) {
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        SDL_SetError("Invalid play length");
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        return (CD_ERROR);
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    }
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    /* Skip data tracks and verify frame offsets */
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    while ((strack <= etrack) &&
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           (cdrom->track[strack].type == SDL_DATA_TRACK)) {
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        ++strack;
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   216
    }
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   217
    if (sframe >= (int) cdrom->track[strack].length) {
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        SDL_SetError("Invalid starting frame for track %d", strack);
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        return (CD_ERROR);
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   220
    }
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   221
    while ((etrack > strack) &&
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           (cdrom->track[etrack - 1].type == SDL_DATA_TRACK)) {
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        --etrack;
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   224
    }
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    if (eframe > (int) cdrom->track[etrack].length) {
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        SDL_SetError("Invalid ending frame for track %d", etrack);
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        return (CD_ERROR);
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    }
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    /* Determine start frame and play length */
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    start = (cdrom->track[strack].offset + sframe);
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    length = (cdrom->track[etrack].offset + eframe) - start;
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#ifdef CLIP_FRAMES
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    /* I've never seen this necessary, but xmcd does it.. */
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    length -= CLIP_FRAMES;      /* CLIP_FRAMES == 10 */
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#endif
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    if (length < 0) {
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   238
        return (0);
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   239
    }
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   240
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    /* Play! */
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#ifdef DEBUG_CDROM
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    fprintf(stderr, "Playing %d frames at offset %d\n", length, start);
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#endif
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   245
    return (SDL_CDcaps.Play(cdrom, start, length));
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   246
}
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int
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SDL_CDPlay(SDL_CD * cdrom, int sframe, int length)
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{
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    /* Check if the CD-ROM subsystem has been initialized */
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    if (!CheckInit(1, &cdrom)) {
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        return (CD_ERROR);
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    }
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    return (SDL_CDcaps.Play(cdrom, sframe, length));
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}
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int
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SDL_CDPause(SDL_CD * cdrom)
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{
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    CDstatus status;
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    int retval;
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    /* Check if the CD-ROM subsystem has been initialized */
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    if (!CheckInit(1, &cdrom)) {
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        return (CD_ERROR);
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    }
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    status = SDL_CDcaps.Status(cdrom, NULL);
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    switch (status) {
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    case CD_PLAYING:
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        retval = SDL_CDcaps.Pause(cdrom);
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        break;
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    default:
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        retval = 0;
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        break;
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   278
    }
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    return (retval);
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}
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int
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SDL_CDResume(SDL_CD * cdrom)
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{
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    CDstatus status;
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    int retval;
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    /* Check if the CD-ROM subsystem has been initialized */
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    if (!CheckInit(1, &cdrom)) {
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        return (CD_ERROR);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   291
    }
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   292
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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    status = SDL_CDcaps.Status(cdrom, NULL);
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   294
    switch (status) {
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   295
    case CD_PAUSED:
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   296
        retval = SDL_CDcaps.Resume(cdrom);
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   297
    default:
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   298
        retval = 0;
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   299
        break;
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   300
    }
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   301
    return (retval);
0
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   302
}
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int
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   305
SDL_CDStop(SDL_CD * cdrom)
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   306
{
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    CDstatus status;
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    int retval;
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    /* Check if the CD-ROM subsystem has been initialized */
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   311
    if (!CheckInit(1, &cdrom)) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   312
        return (CD_ERROR);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   313
    }
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   315
    status = SDL_CDcaps.Status(cdrom, NULL);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   316
    switch (status) {
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   317
    case CD_PLAYING:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   318
    case CD_PAUSED:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   319
        retval = SDL_CDcaps.Stop(cdrom);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   320
    default:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
   321
        retval = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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   322
        break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
   323
    }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   324
    return (retval);
0
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   325
}
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   326
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   327
int
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   328
SDL_CDEject(SDL_CD * cdrom)
0
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diff changeset
   329
{
1895
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   330
    /* Check if the CD-ROM subsystem has been initialized */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   331
    if (!CheckInit(1, &cdrom)) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   332
        return (CD_ERROR);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
   333
    }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
   334
    return (SDL_CDcaps.Eject(cdrom));
0
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   335
}
74212992fb08 Initial revision
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diff changeset
   336
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   337
void
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   338
SDL_CDClose(SDL_CD * cdrom)
0
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diff changeset
   339
{
1895
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   340
    /* Check if the CD-ROM subsystem has been initialized */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
   341
    if (!CheckInit(1, &cdrom)) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
   342
        return;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
   343
    }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
   344
    SDL_CDcaps.Close(cdrom);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   345
    SDL_free(cdrom);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
   346
    default_cdrom = NULL;
0
74212992fb08 Initial revision
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diff changeset
   347
}
74212992fb08 Initial revision
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   348
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   349
void
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   350
SDL_CDROMQuit(void)
0
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diff changeset
   351
{
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
   352
    SDL_SYS_CDQuit();
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
   353
    SDL_cdinitted = 0;
0
74212992fb08 Initial revision
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diff changeset
   354
}
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   355
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
   356
/* vi: set ts=4 sw=4 expandtab: */