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mpv/libdvdread/dvd_input.c

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/* -*- c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
* Copyright (C) 2002 Samuel Hocevar <sam@zoy.org>,
* Håkan Hjort <d95hjort@dtek.chalmers.se>
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#define __USE_GNU /* to get O_DIRECT in linux */
#include <fcntl.h>
#include <unistd.h>
#include "dvd_reader.h"
#include "dvd_input.h"
#include "dvdread_internal.h"
/* The function pointers that is the exported interface of this file. */
dvd_input_t (*dvdinput_open) (const char *);
int (*dvdinput_close) (dvd_input_t);
int (*dvdinput_seek) (dvd_input_t, int);
int (*dvdinput_title) (dvd_input_t, int);
/**
* pointer must be aligned to 2048 bytes
* if reading from a raw/O_DIRECT file
*/
int (*dvdinput_read) (dvd_input_t, void *, int, int);
char * (*dvdinput_error) (dvd_input_t);
#ifdef HAVE_DVDCSS_DVDCSS_H
/* linking to libdvdcss */
#include <dvdcss/dvdcss.h>
#define DVDcss_open(a) dvdcss_open((char*)(a))
#define DVDcss_close dvdcss_close
#define DVDcss_seek dvdcss_seek
#define DVDcss_title dvdcss_title
#define DVDcss_read dvdcss_read
#define DVDcss_error dvdcss_error
#else
/* dlopening libdvdcss */
#include <dlfcn.h>
typedef struct dvdcss_s *dvdcss_handle;
static dvdcss_handle (*DVDcss_open) (const char *);
static int (*DVDcss_close) (dvdcss_handle);
static int (*DVDcss_seek) (dvdcss_handle, int, int);
static int (*DVDcss_title) (dvdcss_handle, int);
static int (*DVDcss_read) (dvdcss_handle, void *, int, int);
static char * (*DVDcss_error) (dvdcss_handle);
#endif
/* The DVDinput handle, add stuff here for new input methods. */
struct dvd_input_s {
/* libdvdcss handle */
dvdcss_handle dvdcss;
/* dummy file input */
int fd;
};
/**
* initialize and open a DVD device or file.
*/
static dvd_input_t css_open(const char *target)
{
dvd_input_t dev;
/* Allocate the handle structure */
dev = (dvd_input_t) malloc(sizeof(struct dvd_input_s));
if(dev == NULL) {
/* malloc has set errno to ENOMEM */
return NULL;
}
/* Really open it with libdvdcss */
dev->dvdcss = DVDcss_open(target);
if(dev->dvdcss == 0) {
free(dev);
dev = NULL;
}
return dev;
}
/**
* return the last error message
*/
static char *css_error(dvd_input_t dev)
{
return DVDcss_error(dev->dvdcss);
}
/**
* seek into the device.
*/
static int css_seek(dvd_input_t dev, int blocks)
{
/* DVDINPUT_NOFLAGS should match the DVDCSS_NOFLAGS value. */
return DVDcss_seek(dev->dvdcss, blocks, DVDINPUT_NOFLAGS);
}
/**
* set the block for the begining of a new title (key).
*/
static int css_title(dvd_input_t dev, int block)
{
return DVDcss_title(dev->dvdcss, block);
}
/**
* read data from the device.
*/
static int css_read(dvd_input_t dev, void *buffer, int blocks, int flags)
{
return DVDcss_read(dev->dvdcss, buffer, blocks, flags);
}
/**
* close the DVD device and clean up the library.
*/
static int css_close(dvd_input_t dev)
{
int ret;
ret = DVDcss_close(dev->dvdcss);
if(ret < 0)
return ret;
free(dev);
return 0;
}
/* Need to use O_BINARY for WIN32 */
#ifndef O_BINARY
#ifdef _O_BINARY
#define O_BINARY _O_BINARY
#else
#define O_BINARY 0
#endif
#endif
/**
* initialize and open a DVD device or file.
*/
static dvd_input_t file_open(const char *target)
{
dvd_input_t dev;
char *use_odirect;
int oflags;
oflags = O_RDONLY | O_BINARY;
use_odirect = getenv("DVDREAD_USE_DIRECT");
if(use_odirect) {
#ifndef O_DIRECT
#define O_DIRECT 0
#endif
oflags |= O_DIRECT;
}
/* Allocate the library structure */
dev = (dvd_input_t) malloc(sizeof(struct dvd_input_s));
if(dev == NULL) {
return NULL;
}
/* Open the device */
dev->fd = open(target, oflags);
if(dev->fd < 0) {
free(dev);
return NULL;
}
return dev;
}
/**
* return the last error message
*/
static char *file_error(dvd_input_t dev)
{
/* use strerror(errno)? */
return (char *)"unknown error";
}
/**
* seek into the device.
*/
static int file_seek(dvd_input_t dev, int blocks)
{
off_t pos = (off_t)blocks * (off_t)DVD_VIDEO_LB_LEN;
pos = lseek(dev->fd, pos, SEEK_SET);
if(pos < 0) {
return pos;
}
/* assert pos % DVD_VIDEO_LB_LEN == 0 */
return (int) (pos / DVD_VIDEO_LB_LEN);
}
/**
* set the block for the begining of a new title (key).
*/
static int file_title(dvd_input_t dev, int block)
{
return -1;
}
/**
* read data from the device.
*/
static int file_read(dvd_input_t dev, void *buffer, int blocks, int flags)
{
size_t len;
ssize_t ret;
unsigned char *buf = buffer;
len = (size_t)blocks * DVD_VIDEO_LB_LEN;
while(len > 0) {
ret = read(dev->fd, buf, len);
if(ret < 0) {
/* One of the reads failed, too bad. We won't even bother
* returning the reads that went ok, and as in the posix spec
* the file postition is left unspecified after a failure. */
return ret;
}
if(ret == 0) {
/* Nothing more to read. Return the whole blocks, if any, that we got.
and adjust the file possition back to the previous block boundary. */
size_t bytes = (size_t)blocks * DVD_VIDEO_LB_LEN - len;
off_t over_read = -(bytes % DVD_VIDEO_LB_LEN);
/*off_t pos =*/ lseek(dev->fd, over_read, SEEK_CUR);
/* should have pos % 2048 == 0 */
return (int) (bytes / DVD_VIDEO_LB_LEN);
}
buf+=ret;
len -= ret;
}
return blocks;
}
/**
* close the DVD device and clean up.
*/
static int file_close(dvd_input_t dev)
{
int ret;
ret = close(dev->fd);
if(ret < 0)
return ret;
free(dev);
return 0;
}
static void *dvdcss_library = NULL;
static int dvdcss_library_init = 0;
/**
* Free any objects allocated by dvdinput_setup.
* Should only be called when libdvdread is not to be used any more.
* Closes dlopened libraries.
*/
void dvdinput_free(void)
{
#ifdef HAVE_DVDCSS_DVDCSS_H
/* linked statically, nothing to free */
return;
#else
if(dvdcss_library) {
dlclose(dvdcss_library);
dvdcss_library = NULL;
}
dvdcss_library_init = 0;
return;
#endif
}
/**
* Setup read functions with either libdvdcss or minimal DVD access.
*/
int dvdinput_setup(void)
{
char **dvdcss_version = NULL;
int verbose;
/* dlopening libdvdcss */
if(dvdcss_library_init) {
/* libdvdcss is already dlopened, function ptrs set */
if(dvdcss_library) {
return 1; /* css available */
} else {
return 0; /* css not available */
}
}
verbose = get_verbose();
#ifdef HAVE_DVDCSS_DVDCSS_H
/* linking to libdvdcss */
dvdcss_library = &dvdcss_library; /* Give it some value != NULL */
/* the DVDcss_* functions have been #defined at the top */
dvdcss_version = &dvdcss_interface_2;
#else
dvdcss_library = dlopen("libdvdcss.so.2", RTLD_LAZY);
if(dvdcss_library != NULL) {
#if defined(__OpenBSD__) && !defined(__ELF__)
#define U_S "_"
#else
#define U_S
#endif
DVDcss_open = (dvdcss_handle (*)(const char*))
dlsym(dvdcss_library, U_S "dvdcss_open");
DVDcss_close = (int (*)(dvdcss_handle))
dlsym(dvdcss_library, U_S "dvdcss_close");
DVDcss_title = (int (*)(dvdcss_handle, int))
dlsym(dvdcss_library, U_S "dvdcss_title");
DVDcss_seek = (int (*)(dvdcss_handle, int, int))
dlsym(dvdcss_library, U_S "dvdcss_seek");
DVDcss_read = (int (*)(dvdcss_handle, void*, int, int))
dlsym(dvdcss_library, U_S "dvdcss_read");
DVDcss_error = (char* (*)(dvdcss_handle))
dlsym(dvdcss_library, U_S "dvdcss_error");
dvdcss_version = (char **)dlsym(dvdcss_library, U_S "dvdcss_interface_2");
if(dlsym(dvdcss_library, U_S "dvdcss_crack")) {
if(verbose >= 0) {
fprintf(stderr,
"libdvdread: Old (pre-0.0.2) version of libdvdcss found.\n"
"libdvdread: You should get the latest version from "
"http://www.videolan.org/\n" );
}
dlclose(dvdcss_library);
dvdcss_library = NULL;
} else if(!DVDcss_open || !DVDcss_close || !DVDcss_title || !DVDcss_seek
|| !DVDcss_read || !DVDcss_error || !dvdcss_version) {
if(verbose >= 0) {
fprintf(stderr, "libdvdread: Missing symbols in libdvdcss.so.2, "
"this shouldn't happen !\n");
}
dlclose(dvdcss_library);
dvdcss_library = NULL;
}
}
#endif /* HAVE_DVDCSS_DVDCSS_H */
dvdcss_library_init = 1;
if(dvdcss_library) {
/*
char *psz_method = getenv( "DVDCSS_METHOD" );
char *psz_verbose = getenv( "DVDCSS_VERBOSE" );
fprintf(stderr, "DVDCSS_METHOD %s\n", psz_method);
fprintf(stderr, "DVDCSS_VERBOSE %s\n", psz_verbose);
*/
if(verbose >= 1) {
fprintf(stderr, "libdvdread: Using libdvdcss version %s for DVD access\n",
*dvdcss_version);
}
/* libdvdcss wrapper functions */
dvdinput_open = css_open;
dvdinput_close = css_close;
dvdinput_seek = css_seek;
dvdinput_title = css_title;
dvdinput_read = css_read;
dvdinput_error = css_error;
return 1;
} else {
if(verbose >= 1) {
fprintf(stderr, "libdvdread: Encrypted DVD support unavailable.\n");
}
/* libdvdcss replacement functions */
dvdinput_open = file_open;
dvdinput_close = file_close;
dvdinput_seek = file_seek;
dvdinput_title = file_title;
dvdinput_read = file_read;
dvdinput_error = file_error;
return 0;
}
}
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