/*****************************************************************************
* LibVlcUtil.java
*****************************************************************************
* Copyright © 2011-2013 VLC authors and VideoLAN
*
* 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.
*
* 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.
*
* 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 com.sxit.dreamiya.utils.video.libvlc;
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;
import android.content.Context;
import android.os.Build;
import android.util.Log;
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;
}
private static String errorMsg = null;
private static boolean isCompatible = false;
public static String getErrorMsg() {
return errorMsg;
}
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;
}
}