public unsafe static void vp8_start_encode(ref BOOL_CODER bc, byte[] source, int length)
{
fixed(byte *pSrc = source)
{
vp8_start_encode(ref bc, pSrc, pSrc + length);
}
}
public static void vp8_encode_value(ref BOOL_CODER bc, int data, int bits)
{
int bit;
for (bit = bits - 1; bit >= 0; bit--)
{
vp8_encode_bool(ref bc, (1 & (data >> bit)), 0x80);
}
}
public static void vp8_stop_encode(ref BOOL_CODER bc)
{
int i;
for (i = 0; i < 32; ++i)
{
vp8_encode_bool(ref bc, 0, 128);
}
}
public unsafe static void vp8_start_encode(ref BOOL_CODER bc, byte *source, byte *source_end)
{
bc.lowvalue = 0;
bc.range = 255;
bc.count = -24;
bc.buffer = source;
bc.buffer_end = source_end;
bc.pos = 0;
}
public unsafe void TestBitIO()
{
Random rnd = new Random();
for (int method = 0; method <= 7; ++method)
{ // we generate various proba
const int kBitsToTest = 1000;
byte[] probas = new byte[kBitsToTest];
for (int i = 0; i < kBitsToTest; ++i)
{
int parity = i & 1;
probas[i] = (byte)(
(method == 0) ? 0 : (method == 1) ? 255 :
(method == 2) ? 128 :
(method == 3) ? rnd.Next(0, 256) :
(method == 4) ? (parity > 0 ? 0 : 255) :
// alternate between low and high proba:
(method == 5) ? (parity > 0 ? rnd.Next(0, 128) : 255 - rnd.Next(0, 128)) :
(method == 6) ?
(parity > 0 ? rnd.Next(0, 64) : 255 - rnd.Next(0, 64)) :
(parity > 0 ? rnd.Next(0, 32) : 255 - rnd.Next(0, 32)));
}
for (int bit_method = 0; bit_method <= 3; ++bit_method)
{
const int random_seed = 6432;
const int kBufferSize = 10000;
rnd = new Random(random_seed);
BOOL_CODER bw = new BOOL_CODER();
byte[] bw_buffer = new byte[kBufferSize];
boolhuff.vp8_start_encode(ref bw, bw_buffer, kBufferSize);
int bit = (bit_method == 0) ? 0 : (bit_method == 1) ? 1 : 0;
for (int i = 0; i < kBitsToTest; ++i)
{
if (bit_method == 2)
{
bit = (i & 1);
}
else if (bit_method == 3)
{
bit = rnd.Next(0, 1);
}
boolhuff.vp8_encode_bool(ref bw, bit, probas[i]);
}
boolhuff.vp8_stop_encode(ref bw);
// vp8dx_bool_decoder_fill() may read into uninitialized data that
// isn't used meaningfully, but may trigger an MSan warning.
//memset(bw_buffer + bw.pos, 0, sizeof(VP8_BD_VALUE) - 1);
for (int i = (int)bw.pos; i < dboolhuff.VP8_BD_VALUE_SIZE; i++)
{
bw_buffer[i] = 0;
}
BOOL_DECODER br = new BOOL_DECODER();
//encrypt_buffer(bw_buffer, kBufferSize);
//vp8dx_start_decode(&br, bw_buffer, kBufferSize, test_decrypt_cb,
// reinterpret_cast<void*>(bw_buffer));
dboolhuff.vp8dx_start_decode(ref br, bw_buffer, kBufferSize);
//bit_rnd.Reset(random_seed);
rnd = new Random(random_seed);
for (int i = 0; i < kBitsToTest; ++i)
{
if (bit_method == 2)
{
bit = (i & 1);
}
else if (bit_method == 3)
{
bit = rnd.Next(0, 1);
}
/*GTEST_ASSERT_EQ(vp8dx_decode_bool(&br, probas[i]), bit)
* << "pos: " << i << " / " << kBitsToTest
* << " bit_method: " << bit_method << " method: " << method;*/
Assert.Equal(dboolhuff.vp8dx_decode_bool(ref br, probas[i]), bit);
}
}
}
}