/**
* **************************************************************************
* LibVlcUtil.java
* ****************************************************************************
* Copyright © 2011-2013 VLC authors and VideoLAN
* <p/>
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
* <p/>
* 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 Lesser General Public License for more details.
* <p/>
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
* ***************************************************************************
*/
package org.videolan.libvlc;
import android.content.Context;
import android.net.Uri;
import android.os.Build;
import android.util.Log;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.util.Locale;
public class LibVlcUtil
{
public final static String TAG = "VLC/LibVLC/Util";
public static boolean isFroyoOrLater()
{
return android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.FROYO;
}
public static boolean isGingerbreadOrLater()
{
return android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.GINGERBREAD;
}
public static boolean isHoneycombOrLater()
{
return android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.HONEYCOMB;
}
public static boolean isICSOrLater()
{
return android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES
.ICE_CREAM_SANDWICH;
}
public static boolean isJellyBeanOrLater()
{
return android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.JELLY_BEAN;
}
public static boolean isJellyBeanMR1OrLater()
{
return android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.JELLY_BEAN_MR1;
}
public static boolean isJellyBeanMR2OrLater()
{
return android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.JELLY_BEAN_MR2;
}
private static String errorMsg = null;
private static boolean isCompatible = false;
public static String getErrorMsg()
{
return errorMsg;
}
public static File URItoFile(String URI)
{
return new File(Uri.decode(URI).replace("file://", ""));
}
public static String URItoFileName(String URI)
{
return URItoFile(URI).getName();
}
public static boolean hasCompatibleCPU(Context context)
{
// If already checked return cached result
if(errorMsg != null || isCompatible) return isCompatible;
ElfData elf = readLib(context.getApplicationInfo().dataDir + "/lib/libvlcjni.so");
if(elf == null)
{
Log.e(TAG, "WARNING: Unable to read libvlcjni.so; cannot check device ABI!");
Log.e(TAG, "WARNING: Cannot guarantee correct ABI for this build (may crash)!");
return true;
}
String CPU_ABI = android.os.Build.CPU_ABI;
String CPU_ABI2 = "none";
if(android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.FROYO)
{ // CPU_ABI2 since 2.2
try
{
CPU_ABI2 = (String) android.os.Build.class.getDeclaredField("CPU_ABI2").get(null);
}
catch(Exception e)
{
}
}
Log.i(TAG, "machine = " + (elf.e_machine == EM_ARM ? "arm" : elf.e_machine == EM_386 ?
"x86" : "mips"));
Log.i(TAG, "arch = " + elf.att_arch);
Log.i(TAG, "fpu = " + elf.att_fpu);
boolean hasNeon = false, hasFpu = false, hasArmV6 = false, hasArmV7 = false, hasMips =
false, hasX86 = false;
float bogoMIPS = -1;
int processors = 0;
if(CPU_ABI.equals("x86"))
{
hasX86 = true;
}
else if(CPU_ABI.equals("armeabi-v7a") || CPU_ABI2.equals("armeabi-v7a"))
{
hasArmV7 = true;
hasArmV6 = true; /* Armv7 is backwards compatible to < v6 */
}
else if(CPU_ABI.equals("armeabi") || CPU_ABI2.equals("armeabi"))
{
hasArmV6 = true;
}
try
{
FileReader fileReader = new FileReader("/proc/cpuinfo");
BufferedReader br = new BufferedReader(fileReader);
String line;
while((line = br.readLine()) != null)
{
if(!hasArmV7 && line.contains("ARMv7"))
{
hasArmV7 = true;
hasArmV6 = true; /* Armv7 is backwards compatible to < v6 */
}
if(!hasArmV7 && !hasArmV6 && line.contains("ARMv6")) hasArmV6 = true;
// "clflush size" is a x86-specific cpuinfo tag.
// (see kernel sources arch/x86/kernel/cpu/proc.c)
if(line.contains("clflush size")) hasX86 = true;
// "microsecond timers" is specific to MIPS.
// see arch/mips/kernel/proc.c
if(line.contains("microsecond timers")) hasMips = true;
if(!hasNeon && line.contains("neon")) hasNeon = true;
if(!hasFpu && line.contains("vfp")) hasFpu = true;
if(line.startsWith("processor")) processors++;
if(bogoMIPS < 0 && line.toLowerCase(Locale.ENGLISH).contains("bogomips"))
{
String[] bogo_parts = line.split(":");
try
{
bogoMIPS = Float.parseFloat(bogo_parts[1].trim());
}
catch(NumberFormatException e)
{
bogoMIPS = -1; // invalid bogomips
}
}
}
fileReader.close();
}
catch(IOException ex)
{
ex.printStackTrace();
errorMsg = "IOException whilst reading cpuinfo flags";
isCompatible = false;
return false;
}
if(processors == 0) processors = 1; // possibly borked cpuinfo?
// Enforce proper architecture to prevent problems
if(elf.e_machine == EM_386 && !hasX86)
{
errorMsg = "x86 build on non-x86 device";
isCompatible = false;
return false;
}
else if(elf.e_machine == EM_ARM && hasX86)
{
errorMsg = "ARM build on x86 device";
isCompatible = false;
return false;
}
if(elf.e_machine == EM_MIPS && !hasMips)
{
errorMsg = "MIPS build on non-MIPS device";
isCompatible = false;
return false;
}
else if(elf.e_machine == EM_ARM && hasMips)
{
errorMsg = "ARM build on MIPS device";
isCompatible = false;
return false;
}
if(elf.e_machine == EM_ARM && elf.att_arch.startsWith("v7") && !hasArmV7)
{
errorMsg = "ARMv7 build on non-ARMv7 device";
isCompatible = false;
return false;
}
if(elf.e_machine == EM_ARM)
{
if(elf.att_arch.startsWith("v6") && !hasArmV6)
{
errorMsg = "ARMv6 build on non-ARMv6 device";
isCompatible = false;
return false;
}
else if(elf.att_fpu && !hasFpu)
{
errorMsg = "FPU-enabled build on non-FPU device";
isCompatible = false;
return false;
}
}
errorMsg = null;
isCompatible = true;
// Store into MachineSpecs
machineSpecs = new MachineSpecs();
machineSpecs.hasArmV6 = hasArmV6;
machineSpecs.hasArmV7 = hasArmV7;
machineSpecs.hasFpu = hasFpu;
machineSpecs.hasMips = hasMips;
machineSpecs.hasNeon = hasNeon;
machineSpecs.hasX86 = hasX86;
machineSpecs.bogoMIPS = bogoMIPS;
machineSpecs.processors = processors;
return true;
}
public static MachineSpecs getMachineSpecs()
{
return machineSpecs;
}
private static MachineSpecs machineSpecs = null;
public static class MachineSpecs
{
public boolean hasNeon;
public boolean hasFpu;
public boolean hasArmV6;
public boolean hasArmV7;
public boolean hasMips;
public boolean hasX86;
public float bogoMIPS;
public int processors;
}
private static final int EM_386 = 3;
private static final int EM_MIPS = 8;
private static final int EM_ARM = 40;
private static final int ELF_HEADER_SIZE = 52;
private static final int SECTION_HEADER_SIZE = 40;
private static final int SHT_ARM_ATTRIBUTES = 0x70000003;
private static class ElfData
{
ByteOrder order;
int e_machine;
int e_shoff;
int e_shnum;
int sh_offset;
int sh_size;
String att_arch;
boolean att_fpu;
}
/** '*' prefix means it's unsupported */
private static String[] CPU_archs = {"*Pre-v4", "*v4", "*v4T", "v5T", "v5TE", "v5TEJ", "v6",
"v6KZ", "v6T2", "v6K", "v7", "*v6-M", "*v6S-M", "*v7E-M", "*v8"};
private static ElfData readLib(String path)
{
File file = new File(path);
if(!file.exists() || !file.canRead()) return null;
RandomAccessFile in = null;
try
{
in = new RandomAccessFile(file, "r");
ElfData elf = new ElfData();
if(!readHeader(in, elf)) return null;
switch(elf.e_machine)
{
case EM_386:
case EM_MIPS:
return elf;
case EM_ARM:
in.close();
in = new RandomAccessFile(file, "r");
if(!readSection(in, elf)) return null;
in.close();
in = new RandomAccessFile(file, "r");
if(!readArmAttributes(in, elf)) return null;
break;
default:
return null;
}
return elf;
}
catch(FileNotFoundException e)
{
e.printStackTrace();
}
catch(IOException e)
{
e.printStackTrace();
}
finally
{
try
{
if(in != null) in.close();
}
catch(IOException e)
{
}
}
return null;
}
private static boolean readHeader(RandomAccessFile in, ElfData elf) throws IOException
{
// http://www.sco.com/developers/gabi/1998-04-29/ch4.eheader.html
byte[] bytes = new byte[ELF_HEADER_SIZE];
in.readFully(bytes);
if(bytes[0] != 127 || bytes[1] != 'E' || bytes[2] != 'L' || bytes[3] != 'F' || bytes[4]
!= 1)
{ // ELFCLASS32, Only 32bit header is supported
return false;
}
elf.order = bytes[5] == 1 ? ByteOrder.LITTLE_ENDIAN // ELFDATA2LSB
: ByteOrder.BIG_ENDIAN; // ELFDATA2MSB
// wrap bytes in a ByteBuffer to force endianess
ByteBuffer buffer = ByteBuffer.wrap(bytes);
buffer.order(elf.order);
elf.e_machine = buffer.getShort(18); /* Architecture */
elf.e_shoff = buffer.getInt(32); /* Section header table file offset */
elf.e_shnum = buffer.getShort(48); /* Section header table entry count */
return true;
}
private static boolean readSection(RandomAccessFile in, ElfData elf) throws IOException
{
byte[] bytes = new byte[SECTION_HEADER_SIZE];
in.seek(elf.e_shoff);
for(int i = 0; i < elf.e_shnum; ++i)
{
in.readFully(bytes);
// wrap bytes in a ByteBuffer to force endianess
ByteBuffer buffer = ByteBuffer.wrap(bytes);
buffer.order(elf.order);
int sh_type = buffer.getInt(4); /* Section type */
if(sh_type != SHT_ARM_ATTRIBUTES) continue;
elf.sh_offset = buffer.getInt(16); /* Section file offset */
elf.sh_size = buffer.getInt(20); /* Section size in bytes */
return true;
}
return false;
}
private static boolean readArmAttributes(RandomAccessFile in, ElfData elf) throws IOException
{
byte[] bytes = new byte[elf.sh_size];
in.seek(elf.sh_offset);
in.readFully(bytes);
// wrap bytes in a ByteBuffer to force endianess
ByteBuffer buffer = ByteBuffer.wrap(bytes);
buffer.order(elf.order);
// http://infocenter.arm.com/help/topic/com.arm.doc.ihi0044e/IHI0044E_aaelf.pdf
// http://infocenter.arm.com/help/topic/com.arm.doc.ihi0045d/IHI0045D_ABI_addenda.pdf
if(buffer.get() != 'A') // format-version
return false;
// sub-sections loop
while(buffer.remaining() > 0)
{
int start_section = buffer.position();
int length = buffer.getInt();
String vendor = getString(buffer);
if(vendor.equals("aeabi"))
{
// tags loop
while(buffer.position() < start_section + length)
{
int start = buffer.position();
int tag = buffer.get();
int size = buffer.getInt();
// skip if not Tag_File, we don't care about others
if(tag != 1)
{
buffer.position(start + size);
continue;
}
// attributes loop
while(buffer.position() < start + size)
{
tag = getUleb128(buffer);
if(tag == 6)
{ // CPU_arch
int arch = getUleb128(buffer);
elf.att_arch = CPU_archs[arch];
}
else if(tag == 27)
{ // ABI_HardFP_use
getUleb128(buffer);
elf.att_fpu = true;
}
else
{
// string for 4=CPU_raw_name / 5=CPU_name /
// 32=compatibility
// string for >32 && odd tags
// uleb128 for other
tag %= 128;
if(tag == 4 || tag == 5 || tag == 32 || (tag > 32 && (tag & 1) != 0))
getString(buffer);
else getUleb128(buffer);
}
}
}
break;
}
}
return true;
}
private static String getString(ByteBuffer buffer)
{
StringBuilder sb = new StringBuilder(buffer.limit());
while(buffer.remaining() > 0)
{
char c = (char) buffer.get();
if(c == 0) break;
sb.append(c);
}
return sb.toString();
}
private static int getUleb128(ByteBuffer buffer)
{
int ret = 0;
int c;
do
{
ret <<= 7;
c = buffer.get();
ret |= c & 0x7f;
} while((c & 0x80) > 0);
return ret;
}
}