SDL_syscdrom.c
资源名称:NETVIDEO.rar [点击查看]
上传用户:sun1608
上传日期:2007-02-02
资源大小:6116k
文件大小:13k
源码类别:
流媒体/Mpeg4/MP4
开发平台:
Visual C++
- /*
- SDL - Simple DirectMedia Layer
- Copyright (C) 1997, 1998, 1999, 2000 Sam Lantinga
- This library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public
- License as published by the Free Software Foundation; either
- version 2 of the License, or (at your option) any later version.
- This library 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
- Library General Public License for more details.
- You should have received a copy of the GNU Library General Public
- License along with this library; if not, write to the Free
- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- Sam Lantinga
- slouken@libsdl.org
- */
- #ifdef SAVE_RCSID
- static char rcsid =
- "@(#) $Id: SDL_syscdrom.c,v 1.5 2002/04/22 21:38:02 wmay Exp $";
- #endif
- /*
- * Functions for system-level CD-ROM audio control for BSD/OS 4.x
- * This started life out as a copy of the freebsd/SDL_cdrom.c file but was
- * heavily modified. Works for standard (MMC) SCSI and ATAPI CDrom drives.
- *
- * Steven Schultz - sms@to.gd-es.com
- */
- #include <sys/types.h>
- #include <stdlib.h>
- #include <sys/stat.h>
- #include <fcntl.h>
- #include <stdio.h>
- #include <string.h>
- #include <errno.h>
- #include <err.h>
- #include <unistd.h>
- #include <sys/ioctl.h>
- #include </sys/dev/scsi/scsi.h>
- #include </sys/dev/scsi/scsi_ioctl.h>
- #include "SDL_error.h"
- #include "SDL_cdrom.h"
- #include "SDL_syscdrom.h"
- /*
- * The msf_to_frame and frame_to_msf were yanked from libcdrom and inlined
- * here so that -lcdrom doesn't have to be dragged in for something so simple.
- */
- #define FRAMES_PER_SECOND 75
- #define FRAMES_PER_MINUTE (FRAMES_PER_SECOND * 60)
- int
- msf_to_frame(int minute, int second, int frame)
- {
- return(minute * FRAMES_PER_MINUTE + second * FRAMES_PER_SECOND + frame);
- }
- void
- frame_to_msf(int frame, int *minp, int *secp, int *framep)
- {
- *minp = frame / FRAMES_PER_MINUTE;
- *secp = (frame % FRAMES_PER_MINUTE) / FRAMES_PER_SECOND;
- *framep = frame % FRAMES_PER_SECOND;
- }
- /* The maximum number of CD-ROM drives we'll detect */
- #define MAX_DRIVES 16
- /* A list of available CD-ROM drives */
- static char *SDL_cdlist[MAX_DRIVES];
- static dev_t SDL_cdmode[MAX_DRIVES];
- /* The system-dependent CD control functions */
- static const char *SDL_SYS_CDName(int drive);
- static int SDL_SYS_CDOpen(int drive);
- static int SDL_SYS_CDGetTOC(SDL_CD *cdrom);
- static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position);
- static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length);
- static int SDL_SYS_CDPause(SDL_CD *cdrom);
- static int SDL_SYS_CDResume(SDL_CD *cdrom);
- static int SDL_SYS_CDStop(SDL_CD *cdrom);
- static int SDL_SYS_CDEject(SDL_CD *cdrom);
- static void SDL_SYS_CDClose(SDL_CD *cdrom);
- typedef struct scsi_cdb cdb_t;
- static int scsi_cmd(int fd,
- struct scsi_cdb *cdb,
- int cdblen,
- int rw,
- caddr_t data,
- int datalen,
- struct scsi_user_cdb *sus)
- {
- int scsistatus;
- unsigned char *cp;
- struct scsi_user_cdb suc;
- /* safety checks */
- if (!cdb) return(-1);
- if (rw != SUC_READ && rw != SUC_WRITE) return(-1);
- suc.suc_flags = rw;
- suc.suc_cdblen = cdblen;
- bcopy(cdb, suc.suc_cdb, cdblen);
- suc.suc_datalen = datalen;
- suc.suc_data = data;
- suc.suc_timeout = 10; /* 10 secs max for TUR or SENSE */
- if (ioctl(fd, SCSIRAWCDB, &suc) == -1)
- return(-11);
- scsistatus = suc.suc_sus.sus_status;
- cp = suc.suc_sus.sus_sense;
- /*
- * If a place to copy the sense data back to has been provided then the
- * caller is responsible for checking the errors and printing any information
- * out if the status was not successful.
- */
- if (scsistatus != 0 && !sus)
- {
- fprintf(stderr,"scsistatus = %x cmd = %xn",
- scsistatus, cdb[0]);
- fprintf(stderr, "sense %x %x %x %x %x %x %x %x %x %x %x %x %x %x %x %xn",
- cp[0], cp[1], cp[2], cp[3], cp[4], cp[5],
- cp[6], cp[7], cp[8], cp[9], cp[10], cp[11],
- cp[12], cp[13], cp[14], cp[15]);
- return(1);
- }
- if (sus)
- bcopy(&suc, sus, sizeof (struct scsi_user_cdb));
- if (scsistatus)
- return(1); /* Return non-zero for unsuccessful status */
- return(0);
- }
- /* request vendor brand and model */
- unsigned char *Inquiry(int fd)
- {
- static struct scsi_cdb6 cdb =
- {
- 0x12,
- 0, 0, 0,
- 56,
- 0
- };
- static unsigned char Inqbuffer[56];
- if (scsi_cmd(fd, (cdb_t *)&cdb, 6, SUC_READ, Inqbuffer,
- sizeof(Inqbuffer), 0))
- return("377");
- return(Inqbuffer);
- }
- #define ADD_SENSECODE 12
- #define ADD_SC_QUALIFIER 13
- int TestForMedium(int fd)
- {
- int sts, asc, ascq;
- struct scsi_user_cdb sus;
- static struct scsi_cdb6 cdb =
- {
- CMD_TEST_UNIT_READY, /* command */
- 0, /* reserved */
- 0, /* reserved */
- 0, /* reserved */
- 0, /* reserved */
- 0 /* reserved */
- };
- again: sts = scsi_cmd(fd, (cdb_t *)&cdb, 6, SUC_READ, 0, 0, &sus);
- asc = sus.suc_sus.sus_sense[ADD_SENSECODE];
- ascq = sus.suc_sus.sus_sense[ADD_SC_QUALIFIER];
- if (asc == 0x3a && ascq == 0x0) /* no medium */
- return(0);
- if (asc == 0x28 && ascq == 0x0) /* medium changed */
- goto again;
- if (asc == 0x4 && ascq == 0x1 ) /* coming ready */
- {
- sleep(2);
- goto again;
- }
- return(1);
- }
- /* Check a drive to see if it is a CD-ROM */
- static int CheckDrive(char *drive, struct stat *stbuf)
- {
- int is_cd = 0, cdfd;
- char *p;
- /* If it doesn't exist, return -1 */
- if ( stat(drive, stbuf) < 0 ) {
- return(-1);
- }
- /* If it does exist, verify that it's an available CD-ROM */
- cdfd = open(drive, (O_RDONLY|O_EXCL|O_NONBLOCK), 0);
- if ( cdfd >= 0 ) {
- p = Inquiry(cdfd);
- if (*p == TYPE_ROM)
- is_cd = 1;
- close(cdfd);
- }
- return(is_cd);
- }
- /* Add a CD-ROM drive to our list of valid drives */
- static void AddDrive(char *drive, struct stat *stbuf)
- {
- int i;
- if ( SDL_numcds < MAX_DRIVES ) {
- /* Check to make sure it's not already in our list.
- This can happen when we see a drive via symbolic link.
- */
- for ( i=0; i<SDL_numcds; ++i ) {
- if ( stbuf->st_rdev == SDL_cdmode[i] ) {
- #ifdef DEBUG_CDROM
- fprintf(stderr, "Duplicate drive detected: %s == %sn", drive, SDL_cdlist[i]);
- #endif
- return;
- }
- }
- /* Add this drive to our list */
- i = SDL_numcds;
- SDL_cdlist[i] = (char *)malloc(strlen(drive)+1);
- if ( SDL_cdlist[i] == NULL ) {
- SDL_OutOfMemory();
- return;
- }
- strcpy(SDL_cdlist[i], drive);
- SDL_cdmode[i] = stbuf->st_rdev;
- ++SDL_numcds;
- #ifdef DEBUG_CDROM
- fprintf(stderr, "Added CD-ROM drive: %sn", drive);
- #endif
- }
- }
- int SDL_SYS_CDInit(void)
- {
- /* checklist: /dev/rsr?c */
- static char *checklist[] = {
- "?0 rsr?", NULL
- };
- char *SDLcdrom;
- int i, j, exists;
- char drive[32];
- struct stat stbuf;
- /* Fill in our driver capabilities */
- SDL_CDcaps.Name = SDL_SYS_CDName;
- SDL_CDcaps.Open = SDL_SYS_CDOpen;
- SDL_CDcaps.GetTOC = SDL_SYS_CDGetTOC;
- SDL_CDcaps.Status = SDL_SYS_CDStatus;
- SDL_CDcaps.Play = SDL_SYS_CDPlay;
- SDL_CDcaps.Pause = SDL_SYS_CDPause;
- SDL_CDcaps.Resume = SDL_SYS_CDResume;
- SDL_CDcaps.Stop = SDL_SYS_CDStop;
- SDL_CDcaps.Eject = SDL_SYS_CDEject;
- SDL_CDcaps.Close = SDL_SYS_CDClose;
- /* Look in the environment for our CD-ROM drive list */
- SDLcdrom = getenv("SDL_CDROM"); /* ':' separated list of devices */
- if ( SDLcdrom != NULL ) {
- char *cdpath, *delim;
- cdpath = malloc(strlen(SDLcdrom)+1);
- if ( cdpath != NULL ) {
- strcpy(cdpath, SDLcdrom);
- SDLcdrom = cdpath;
- do {
- delim = strchr(SDLcdrom, ':');
- if ( delim ) {
- *delim++ = ' ';
- }
- if ( CheckDrive(SDLcdrom, &stbuf) > 0 ) {
- AddDrive(SDLcdrom, &stbuf);
- }
- if ( delim ) {
- SDLcdrom = delim;
- } else {
- SDLcdrom = NULL;
- }
- } while ( SDLcdrom );
- free(cdpath);
- }
- /* If we found our drives, there's nothing left to do */
- if ( SDL_numcds > 0 ) {
- return(0);
- }
- }
- /* Scan the system for CD-ROM drives */
- for ( i=0; checklist[i]; ++i ) {
- if ( checklist[i][0] == '?' ) {
- char *insert;
- exists = 1;
- for ( j=checklist[i][1]; exists; ++j ) {
- sprintf(drive, "/dev/%sc", &checklist[i][3]);
- insert = strchr(drive, '?');
- if ( insert != NULL ) {
- *insert = j;
- }
- switch (CheckDrive(drive, &stbuf)) {
- /* Drive exists and is a CD-ROM */
- case 1:
- AddDrive(drive, &stbuf);
- break;
- /* Drive exists, but isn't a CD-ROM */
- case 0:
- break;
- /* Drive doesn't exist */
- case -1:
- exists = 0;
- break;
- }
- }
- } else {
- sprintf(drive, "/dev/%s", checklist[i]);
- if ( CheckDrive(drive, &stbuf) > 0 ) {
- AddDrive(drive, &stbuf);
- }
- }
- }
- return(0);
- }
- static const char *SDL_SYS_CDName(int drive)
- {
- return(SDL_cdlist[drive]);
- }
- static int SDL_SYS_CDOpen(int drive)
- {
- return(open(SDL_cdlist[drive], O_RDONLY | O_NONBLOCK | O_EXCL, 0));
- }
- static int SDL_SYS_CDGetTOC(SDL_CD *cdrom)
- {
- u_char cdb[10], buf[4], *p, *toc;
- struct scsi_user_cdb sus;
- int i, sts, first_track, last_track, ntracks, toc_size;
- bzero(cdb, sizeof (cdb));
- cdb[0] = 0x43; /* Read TOC */
- cdb[1] = 0x2; /* MSF */
- cdb[8] = 4; /* size TOC header */
- sts = scsi_cmd(cdrom->id, (cdb_t *)cdb, 10, SUC_READ, buf, 4, &sus);
- if (sts < 0)
- return(-1);
- first_track = buf[2];
- last_track = buf[3];
- ntracks = last_track - first_track + 1;
- cdrom->numtracks = ntracks;
- toc_size = 4 + (ntracks + 1) * 8;
- toc = (u_char *)malloc(toc_size);
- if (toc == NULL)
- return(-1);
- bzero(cdb, sizeof (cdb));
- cdb[0] = 0x43;
- cdb[1] = 0x2;
- cdb[6] = first_track;
- cdb[7] = toc_size >> 8;
- cdb[8] = toc_size & 0xff;
- sts = scsi_cmd(cdrom->id, (cdb_t *)cdb, 10, SUC_READ, toc, toc_size,
- &sus);
- if (sts < 0)
- {
- free(toc);
- return(-1);
- }
- for (i = 0, p = toc+4; i <= ntracks; i++, p+= 8)
- {
- if (i == ntracks)
- cdrom->track[i].id = 0xAA; /* Leadout */
- else
- cdrom->track[i].id = first_track + i;
- if (p[1] & 0x20)
- cdrom->track[i].type = SDL_DATA_TRACK;
- else
- cdrom->track[i].type = SDL_AUDIO_TRACK;
- cdrom->track[i].offset = msf_to_frame(p[5], p[6], p[7]);
- cdrom->track[i].length = 0;
- if (i > 0)
- cdrom->track[i-1].length = cdrom->track[i].offset -
- cdrom->track[i-1].offset;
- }
- free(toc);
- return(0);
- }
- /* Get CD-ROM status */
- static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position)
- {
- CDstatus status;
- u_char cdb[10], buf[16];
- int sts;
- struct scsi_user_cdb sus;
- bzero(cdb, sizeof (cdb));
- cdb[0] = 0x42; /* read subq */
- cdb[1] = 0x2; /* MSF */
- cdb[2] = 0x40; /* q channel */
- cdb[3] = 1; /* current pos */
- cdb[7] = sizeof (buf) >> 8;
- cdb[8] = sizeof (buf) & 0xff;
- sts = scsi_cmd(cdrom->id, (cdb_t *)cdb, 10, SUC_READ, buf, sizeof (buf),
- &sus);
- if (sts < 0)
- return(-1);
- if (sts)
- {
- if (TestForMedium(cdrom->id) == 0)
- status = CD_TRAYEMPTY;
- else
- status = CD_ERROR;
- }
- else
- {
- switch (buf[1])
- {
- case 0x11:
- status = CD_PLAYING;
- break;
- case 0x12:
- status = CD_PAUSED;
- break;
- case 0x13:
- case 0x14:
- case 0x15:
- status = CD_STOPPED;
- break;
- default:
- status = CD_ERROR;
- break;
- }
- }
- if (position)
- {
- if ( status == CD_PLAYING || (status == CD_PAUSED) )
- *position = msf_to_frame(buf[9], buf[10], buf[11]);
- else
- *position = 0;
- }
- return(status);
- }
- /* Start play */
- static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length)
- {
- u_char cdb[10];
- int sts, minute, second, frame, eminute, esecond, eframe;
- struct scsi_user_cdb sus;
- bzero(cdb, sizeof(cdb));
- cdb[0] = 0x47; /* Play */
- frame_to_msf(start, &minute, &second, &frame);
- frame_to_msf(start + length, &eminute, &esecond, &eframe);
- cdb[3] = minute;
- cdb[4] = second;
- cdb[5] = frame;
- cdb[6] = eminute;
- cdb[7] = esecond;
- cdb[8] = eframe;
- sts = scsi_cmd(cdrom->id, (cdb_t *)cdb, 10, SUC_READ, 0, 0, &sus);
- return(sts);
- }
- static int
- pauseresume(SDL_CD *cdrom, int flag)
- {
- u_char cdb[10];
- struct scsi_user_cdb sus;
- bzero(cdb, sizeof (cdb));
- cdb[0] = 0x4b;
- cdb[8] = flag & 0x1;
- return(scsi_cmd(cdrom->id, (cdb_t *)cdb, 10, SUC_READ, 0, 0, &sus));
- }
- /* Pause play */
- static int SDL_SYS_CDPause(SDL_CD *cdrom)
- {
- return(pauseresume(cdrom, 0));
- }
- /* Resume play */
- static int SDL_SYS_CDResume(SDL_CD *cdrom)
- {
- return(pauseresume(cdrom, 1));
- }
- /* Stop play */
- static int SDL_SYS_CDStop(SDL_CD *cdrom)
- {
- u_char cdb[6];
- struct scsi_user_cdb sus;
- bzero(cdb, sizeof (cdb));
- cdb[0] = 0x1b; /* stop */
- cdb[1] = 1; /* immediate */
- return(scsi_cmd(cdrom->id, (cdb_t *)cdb, 6, SUC_READ, 0, 0, &sus));
- }
- /* Eject the CD-ROM */
- static int SDL_SYS_CDEject(SDL_CD *cdrom)
- {
- u_char cdb[6];
- struct scsi_user_cdb sus;
- bzero(cdb, sizeof (cdb));
- cdb[0] = 0x1b; /* stop */
- cdb[1] = 1; /* immediate */
- cdb[4] = 2; /* eject */
- return(scsi_cmd(cdrom->id, (cdb_t *)cdb, 6, SUC_READ, 0, 0, &sus));
- }
- /* Close the CD-ROM handle */
- static void SDL_SYS_CDClose(SDL_CD *cdrom)
- {
- close(cdrom->id);
- }
- void SDL_SYS_CDQuit(void)
- {
- int i;
- if ( SDL_numcds > 0 ) {
- for ( i=0; i<SDL_numcds; ++i ) {
- free(SDL_cdlist[i]);
- }
- }
- SDL_numcds = 0;
- }