X-Git-Url: http://git.maemo.org/git/?p=mardrone;a=blobdiff_plain;f=mardrone%2FARDrone_SDK_Version_1_8_20110726%2FARDroneLib%2FVLIB%2FP264%2Fp264.c;fp=mardrone%2FARDrone_SDK_Version_1_8_20110726%2FARDroneLib%2FVLIB%2FP264%2Fp264.c;h=c5accad3ce8db9d9349307593d2f4b73c36ee117;hp=0000000000000000000000000000000000000000;hb=9ec9bc13b75d30bc45535c54a652934debfcea92;hpb=ae0a3c2dc0898400aca0dd6b439c5db8044db7b2

diff --git a/mardrone/ARDrone_SDK_Version_1_8_20110726/ARDroneLib/VLIB/P264/p264.c b/mardrone/ARDrone_SDK_Version_1_8_20110726/ARDroneLib/VLIB/P264/p264.c
new file mode 100644
index 0000000..c5accad
--- /dev/null
+++ b/mardrone/ARDrone_SDK_Version_1_8_20110726/ARDroneLib/VLIB/P264/p264.c
@@ -0,0 +1,249 @@
+#include <VLIB/Platform/video_utils.h>
+#include <VLIB/video_packetizer.h>
+
+#include <VP_Os/vp_os_assert.h>
+
+#include <VP_Os/vp_os_types.h>
+
+#include <VLIB/P264/p264.h>
+
+#ifndef HAS_P264_ENCODE
+//TODO: rename this file and this function (something like p264_entropic.c)
+
+#define PACK_BITS( bits_out, length_out, bits_in, length_in ) \
+  bits_out  <<= length_in;                                    \
+  length_out += length_in;                                    \
+  bits_out   |= bits_in;
+
+void p264_encode_int(video_stream_t* const stream, int32_t code)
+{
+  int32_t sign, length, data, value_code, value_length;
+
+  value_code = 0;
+  value_length = 0;
+  /// Encode level
+  data = code;
+
+  if (data != 0)
+  {
+    // sign handling
+    sign = 0;
+    if( data < 0 )
+    {
+      data = -data;
+      sign = 1;
+    }
+
+    // TODO Check saturation & if level == -128
+    length = 32 - clz(data);  // number of bits used in level ( = length of level )
+    if( length > 1 )
+    {
+      data   -= 1 << (length - 1);
+      length += 1;
+    }
+
+    PACK_BITS( value_code, value_length, 1, length );
+
+    length -= 2;
+    if(length > 0)
+    {
+      PACK_BITS( value_code, value_length, data, length );
+    }
+
+    PACK_BITS( value_code, value_length, sign, 1 );
+
+    /// Write output
+    video_write_data( stream, value_code, value_length );
+  }
+  else
+  {
+     video_write_data( stream, 0x01, 2 );
+  }
+}
+
+void p264_decode_int(video_stream_t* const stream, int32_t *code)
+{
+  uint32_t stream_code, stream_length;
+  int32_t r = 0, z, sign;
+
+  stream_code = stream_length = 0;
+
+  // Peek 32 bits from stream because we know our datas fit in
+  video_peek_data( stream, &stream_code, 32 );
+
+  /// Decode level / last
+  z = clz(stream_code);
+
+  stream_code  <<= z + 1; // Skip all zeros & 1
+  stream_length += z + 1;
+
+  if( z == 1 )
+  {
+    *code = 0;
+  }
+  else
+  {
+    if( z == 0 )
+    {
+      z = 1;
+      r = 1;
+    }
+
+    stream_length  += z;
+
+    stream_code >>= (32 - z);
+    sign = stream_code & 1;
+
+    if( z != 0 )
+    {
+      r  = stream_code >> 1;
+      r += 1 << (z-1);
+    }
+
+    *code = sign ? -r : r;
+  }
+
+  // Do the real Read in stream to consume what we used
+  video_read_data( stream, &stream_code, stream_length );
+
+}
+
+void p264_encode( video_stream_t* const stream, int32_t level, int32_t run, int32_t not_last )
+{
+  int32_t sign, length, data, value_code, value_length;
+
+  /// Encode number of zeros
+  data = run;
+
+  length      = 0;
+  value_code  = 1;
+
+  if( data > 0 )
+  {
+    length = 32 - clz(data);      // compute number of bits used in run ( = length of run )
+    data  -= 1 << ( length - 1 ); // compute value of run
+  }
+
+  value_length  = length + 1;
+
+  length -= 1;
+  if( length > 0 )
+  {
+    PACK_BITS( value_code, value_length, data, length );
+  }
+
+  /// Encode level
+  data = level;
+
+  // sign handling
+  sign = 0;
+  if( data < 0 )
+  {
+    data = -data;
+    sign = 1;
+  }
+
+  // TODO Check saturation & if level == -128
+  length = 32 - clz(data);  // number of bits used in level ( = length of level )
+  if( length > 1 )
+  {
+    data   -= 1 << (length - 1);
+    length += 1;
+  }
+
+  PACK_BITS( value_code, value_length, 1, length );
+
+  VP_OS_ASSERT( length != 2 );
+
+  length -= 2;
+  if(length > 0)
+  {
+    PACK_BITS( value_code, value_length, data, length );
+  }
+
+  PACK_BITS( value_code, value_length, sign, 1 );
+
+  /// Encode last
+  // add sequence for end of block if required
+  if( not_last == 0 )
+  {
+    PACK_BITS( value_code, value_length, 0x5, 3 );
+  }
+
+  /// Write output
+  video_write_data( stream, value_code, value_length );
+}
+
+#endif // HAS_UVLC_ENCODE
+
+C_RESULT p264_decode( video_stream_t* const stream, int32_t* run, uint32_t* level, int32_t* last)
+{
+  uint32_t stream_code, stream_length;
+  int32_t r = 0, z, sign;
+
+  stream_code = stream_length = 0;
+
+  // Peek 32 bits from stream because we know our datas fit in
+  video_peek_data( stream, &stream_code, 32 );
+
+
+  /// Decode number of zeros
+  z = clz(stream_code);
+
+  stream_code  <<= z + 1; // Skip all zeros & 1
+  stream_length += z + 1;
+
+  if( z > 1 )
+  {
+    r = stream_code >> (32 - (z-1));
+
+    stream_code   <<= (z-1);
+    stream_length  += (z-1);
+
+    *run = r + (1 << (z-1));
+  }
+  else
+  {
+    *run = z;
+  }
+
+
+  /// Decode level / last
+  z = clz(stream_code);
+
+  stream_code  <<= z + 1; // Skip all zeros & 1
+  stream_length += z + 1;
+
+  if( z == 1 )
+  {
+    *run  = 0;
+    *last = 1;
+  }
+  else
+  {
+    if( z == 0 )
+    {
+      z = 1;
+      r = 1;
+    }
+
+    stream_length  += z;
+
+    stream_code >>= (32 - z);
+    sign = stream_code & 1;
+
+    if( z != 0 )
+    {
+      r  = stream_code >> 1;
+      r += 1 << (z-1);
+    }
+
+    *level = sign ? -r : r;
+    *last  = 0;
+  }
+
+  // Do the real Read in stream to consume what we used
+  video_read_data( stream, &stream_code, stream_length );
+
+  return C_OK;
+}