mirror of
https://github.com/mpv-player/mpv
synced 2024-12-25 00:02:13 +00:00
d7d3f53317
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@17787 b3059339-0415-0410-9bf9-f77b7e298cf2
354 lines
8.9 KiB
C
354 lines
8.9 KiB
C
/*
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* Copyright (C) 2002 Samuel Hocevar <sam@zoy.org>,
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* Håkan Hjort <d95hjort@dtek.chalmers.se>
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*
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* Modified for use with MPlayer, changes contained in libdvdread_changes.diff.
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* detailed CVS changelog at http://www.mplayerhq.hu/cgi-bin/cvsweb.cgi/main/
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* $Id$
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
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*/
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#include "config.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include "dvd_reader.h"
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#include "dvd_input.h"
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/* The function pointers that is the exported interface of this file. */
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dvd_input_t (*dvdinput_open) (const char *);
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int (*dvdinput_close) (dvd_input_t);
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int (*dvdinput_seek) (dvd_input_t, int);
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int (*dvdinput_title) (dvd_input_t, int);
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int (*dvdinput_read) (dvd_input_t, void *, int, int);
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char * (*dvdinput_error) (dvd_input_t);
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#ifdef HAVE_DVDCSS_DVDCSS_H
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/* linking to libdvdcss */
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#include "dvdcss.h"
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#define DVDcss_open(a) dvdcss_open((char*)(a))
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#define DVDcss_close dvdcss_close
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#define DVDcss_seek dvdcss_seek
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#define DVDcss_title dvdcss_title
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#define DVDcss_read dvdcss_read
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#define DVDcss_error dvdcss_error
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#else
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/* dlopening libdvdcss */
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#include <dlfcn.h>
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typedef struct dvdcss_s *dvdcss_handle;
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static dvdcss_handle (*DVDcss_open) (const char *);
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static int (*DVDcss_close) (dvdcss_handle);
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static int (*DVDcss_seek) (dvdcss_handle, int, int);
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static int (*DVDcss_title) (dvdcss_handle, int);
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static int (*DVDcss_read) (dvdcss_handle, void *, int, int);
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static char * (*DVDcss_error) (dvdcss_handle);
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#endif
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/* The DVDinput handle, add stuff here for new input methods. */
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struct dvd_input_s {
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/* libdvdcss handle */
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dvdcss_handle dvdcss;
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/* dummy file input */
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int fd;
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};
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/**
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* initialize and open a DVD device or file.
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*/
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static dvd_input_t css_open(const char *target)
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{
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dvd_input_t dev;
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/* Allocate the handle structure */
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dev = (dvd_input_t) malloc(sizeof(struct dvd_input_s));
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if(dev == NULL) {
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fprintf(stderr, "libdvdread: Could not allocate memory.\n");
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return NULL;
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}
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/* Really open it with libdvdcss */
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dev->dvdcss = DVDcss_open(target);
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if(dev->dvdcss == 0) {
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fprintf(stderr, "libdvdread: Could not open %s with libdvdcss.\n", target);
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free(dev);
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return NULL;
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}
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return dev;
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}
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/**
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* return the last error message
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*/
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static char *css_error(dvd_input_t dev)
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{
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return DVDcss_error(dev->dvdcss);
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}
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/**
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* seek into the device.
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*/
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static int css_seek(dvd_input_t dev, int blocks)
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{
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/* DVDINPUT_NOFLAGS should match the DVDCSS_NOFLAGS value. */
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return DVDcss_seek(dev->dvdcss, blocks, DVDINPUT_NOFLAGS);
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}
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/**
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* set the block for the begining of a new title (key).
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*/
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static int css_title(dvd_input_t dev, int block)
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{
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return DVDcss_title(dev->dvdcss, block);
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}
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/**
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* read data from the device.
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*/
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static int css_read(dvd_input_t dev, void *buffer, int blocks, int flags)
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{
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return DVDcss_read(dev->dvdcss, buffer, blocks, flags);
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}
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/**
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* close the DVD device and clean up the library.
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*/
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static int css_close(dvd_input_t dev)
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{
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int ret;
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ret = DVDcss_close(dev->dvdcss);
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if(ret < 0)
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return ret;
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free(dev);
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return 0;
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}
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/**
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* initialize and open a DVD device or file.
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*/
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static dvd_input_t file_open(const char *target)
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{
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dvd_input_t dev;
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/* Allocate the library structure */
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dev = (dvd_input_t) malloc(sizeof(struct dvd_input_s));
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if(dev == NULL) {
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fprintf(stderr, "libdvdread: Could not allocate memory.\n");
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return NULL;
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}
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/* Open the device */
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dev->fd = open(target, O_RDONLY);
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if(dev->fd < 0) {
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perror("libdvdread: Could not open input");
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free(dev);
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return NULL;
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}
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return dev;
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}
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/**
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* return the last error message
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*/
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static char *file_error(dvd_input_t dev)
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{
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/* use strerror(errno)? */
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return (char *)"unknown error";
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}
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/**
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* seek into the device.
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*/
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static int file_seek(dvd_input_t dev, int blocks)
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{
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off_t pos;
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pos = lseek(dev->fd, (off_t)blocks * (off_t)DVD_VIDEO_LB_LEN, SEEK_SET);
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if(pos < 0) {
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return pos;
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}
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/* assert pos % DVD_VIDEO_LB_LEN == 0 */
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return (int) (pos / DVD_VIDEO_LB_LEN);
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}
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/**
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* set the block for the begining of a new title (key).
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*/
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static int file_title(dvd_input_t dev, int block)
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{
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return -1;
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}
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/**
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* read data from the device.
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*/
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static int file_read(dvd_input_t dev, void *buffer, int blocks, int flags)
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{
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size_t len;
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ssize_t ret;
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len = (size_t)blocks * DVD_VIDEO_LB_LEN;
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while(len > 0) {
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ret = read(dev->fd, buffer, len);
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if(ret < 0) {
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/* One of the reads failed, too bad. We won't even bother
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* returning the reads that went ok, and as in the posix spec
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* the file postition is left unspecified after a failure. */
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return ret;
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}
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if(ret == 0) {
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/* Nothing more to read. Return the whole blocks, if any, that we got.
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and adjust the file possition back to the previous block boundary. */
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size_t bytes = (size_t)blocks * DVD_VIDEO_LB_LEN - len;
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off_t over_read = -(bytes % DVD_VIDEO_LB_LEN);
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/*off_t pos =*/ lseek(dev->fd, over_read, SEEK_CUR);
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/* should have pos % 2048 == 0 */
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return (int) (bytes / DVD_VIDEO_LB_LEN);
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}
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len -= ret;
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}
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return blocks;
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}
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/**
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* close the DVD device and clean up.
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*/
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static int file_close(dvd_input_t dev)
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{
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int ret;
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ret = close(dev->fd);
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if(ret < 0)
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return ret;
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free(dev);
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return 0;
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}
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/**
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* Setup read functions with either libdvdcss or minimal DVD access.
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*/
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int dvdinput_setup(void)
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{
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void *dvdcss_library = NULL;
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char **dvdcss_version = NULL;
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#ifdef HAVE_DVDCSS_DVDCSS_H
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/* linking to libdvdcss */
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dvdcss_library = &dvdcss_library; /* Give it some value != NULL */
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/* the DVDcss_* functions have been #defined at the top */
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dvdcss_version = &dvdcss_interface_2;
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#else
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/* dlopening libdvdcss */
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dvdcss_library = dlopen("libdvdcss.so.2", RTLD_LAZY);
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if(dvdcss_library != NULL) {
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#if defined(__OpenBSD__) && !defined(__ELF__)
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#define U_S "_"
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#else
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#define U_S
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#endif
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DVDcss_open = (dvdcss_handle (*)(const char*))
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dlsym(dvdcss_library, U_S "dvdcss_open");
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DVDcss_close = (int (*)(dvdcss_handle))
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dlsym(dvdcss_library, U_S "dvdcss_close");
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DVDcss_title = (int (*)(dvdcss_handle, int))
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dlsym(dvdcss_library, U_S "dvdcss_title");
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DVDcss_seek = (int (*)(dvdcss_handle, int, int))
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dlsym(dvdcss_library, U_S "dvdcss_seek");
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DVDcss_read = (int (*)(dvdcss_handle, void*, int, int))
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dlsym(dvdcss_library, U_S "dvdcss_read");
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DVDcss_error = (char* (*)(dvdcss_handle))
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dlsym(dvdcss_library, U_S "dvdcss_error");
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dvdcss_version = (char **)dlsym(dvdcss_library, U_S "dvdcss_interface_2");
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if(dlsym(dvdcss_library, U_S "dvdcss_crack")) {
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fprintf(stderr,
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"libdvdread: Old (pre-0.0.2) version of libdvdcss found.\n"
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"libdvdread: You should get the latest version from "
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"http://www.videolan.org/\n" );
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dlclose(dvdcss_library);
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dvdcss_library = NULL;
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} else if(!DVDcss_open || !DVDcss_close || !DVDcss_title || !DVDcss_seek
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|| !DVDcss_read || !DVDcss_error || !dvdcss_version) {
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fprintf(stderr, "libdvdread: Missing symbols in libdvdcss.so.2, "
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"this shouldn't happen !\n");
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dlclose(dvdcss_library);
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}
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}
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#endif /* HAVE_DVDCSS_DVDCSS_H */
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if(dvdcss_library != NULL) {
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/*
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char *psz_method = getenv( "DVDCSS_METHOD" );
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char *psz_verbose = getenv( "DVDCSS_VERBOSE" );
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fprintf(stderr, "DVDCSS_METHOD %s\n", psz_method);
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fprintf(stderr, "DVDCSS_VERBOSE %s\n", psz_verbose);
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*/
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/*
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fprintf(stderr, "libdvdread: Using libdvdcss version %s for DVD access\n",
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*dvdcss_version);
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*/
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/* libdvdcss wrapper functions */
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dvdinput_open = css_open;
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dvdinput_close = css_close;
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dvdinput_seek = css_seek;
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dvdinput_title = css_title;
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dvdinput_read = css_read;
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dvdinput_error = css_error;
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return 1;
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} else {
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fprintf(stderr, "libdvdread: Encrypted DVD support unavailable.\n");
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/* libdvdcss replacement functions */
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dvdinput_open = file_open;
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dvdinput_close = file_close;
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dvdinput_seek = file_seek;
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dvdinput_title = file_title;
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dvdinput_read = file_read;
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dvdinput_error = file_error;
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return 0;
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}
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}
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