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-rw-r--r--media/libstagefright/codecs/avc/dec/src/vlc.cpp815
1 files changed, 815 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/avc/dec/src/vlc.cpp b/media/libstagefright/codecs/avc/dec/src/vlc.cpp
new file mode 100644
index 0000000..f531249
--- /dev/null
+++ b/media/libstagefright/codecs/avc/dec/src/vlc.cpp
@@ -0,0 +1,815 @@
+/* ------------------------------------------------------------------
+ * Copyright (C) 1998-2009 PacketVideo
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
+ * express or implied.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ * -------------------------------------------------------------------
+ */
+#include "avcdec_lib.h"
+#include "avcdec_bitstream.h"
+
+//#define PV_ARM_V5
+#ifdef PV_ARM_V5
+#define PV_CLZ(A,B) __asm{CLZ (A),(B)} \
+ A -= 16;
+#else
+#define PV_CLZ(A,B) while (((B) & 0x8000) == 0) {(B) <<=1; A++;}
+#endif
+
+
+#define PV_NO_CLZ
+
+#ifndef PV_NO_CLZ
+typedef struct tagVLCNumCoeffTrail
+{
+ int trailing;
+ int total_coeff;
+ int length;
+} VLCNumCoeffTrail;
+
+typedef struct tagShiftOffset
+{
+ int shift;
+ int offset;
+} ShiftOffset;
+
+const VLCNumCoeffTrail NumCoeffTrailOnes[3][67] =
+{
+ {{0, 0, 1}, {1, 1, 2}, {2, 2, 3}, {1, 2, 6}, {0, 1, 6}, {3, 3, 5}, {3, 3, 5}, {3, 5, 7},
+ {2, 3, 7}, {3, 4, 6}, {3, 4, 6}, {3, 6, 8}, {2, 4, 8}, {1, 3, 8}, {0, 2, 8}, {3, 7, 9},
+ {2, 5, 9}, {1, 4, 9}, {0, 3, 9}, {3, 8, 10}, {2, 6, 10}, {1, 5, 10}, {0, 4, 10}, {3, 9, 11},
+ {2, 7, 11}, {1, 6, 11}, {0, 5, 11}, {0, 8, 13}, {2, 9, 13}, {1, 8, 13}, {0, 7, 13}, {3, 10, 13},
+ {2, 8, 13}, {1, 7, 13}, {0, 6, 13}, {3, 12, 14}, {2, 11, 14}, {1, 10, 14}, {0, 10, 14}, {3, 11, 14},
+ {2, 10, 14}, {1, 9, 14}, {0, 9, 14}, {3, 14, 15}, {2, 13, 15}, {1, 12, 15}, {0, 12, 15}, {3, 13, 15},
+ {2, 12, 15}, {1, 11, 15}, {0, 11, 15}, {3, 16, 16}, {2, 15, 16}, {1, 15, 16}, {0, 14, 16}, {3, 15, 16},
+ {2, 14, 16}, {1, 14, 16}, {0, 13, 16}, {0, 16, 16}, {2, 16, 16}, {1, 16, 16}, {0, 15, 16}, {1, 13, 15},
+ { -1, -1, -1}, { -1, -1, -1}, { -1, -1, -1}},
+
+ {{1, 1, 2}, {0, 0, 2}, {3, 4, 4}, {3, 3, 4}, {2, 2, 3}, {2, 2, 3}, {3, 6, 6}, {2, 3, 6},
+ {1, 3, 6}, {0, 1, 6}, {3, 5, 5}, {3, 5, 5}, {1, 2, 5}, {1, 2, 5}, {3, 7, 6}, {2, 4, 6},
+ {1, 4, 6}, {0, 2, 6}, {3, 8, 7}, {2, 5, 7}, {1, 5, 7}, {0, 3, 7}, {0, 5, 8}, {2, 6, 8},
+ {1, 6, 8}, {0, 4, 8}, {3, 9, 9}, {2, 7, 9}, {1, 7, 9}, {0, 6, 9}, {3, 11, 11}, {2, 9, 11},
+ {1, 9, 11}, {0, 8, 11}, {3, 10, 11}, {2, 8, 11}, {1, 8, 11}, {0, 7, 11}, {0, 11, 12}, {2, 11, 12},
+ {1, 11, 12}, {0, 10, 12}, {3, 12, 12}, {2, 10, 12}, {1, 10, 12}, {0, 9, 12}, {3, 14, 13}, {2, 13, 13},
+ {1, 13, 13}, {0, 13, 13}, {3, 13, 13}, {2, 12, 13}, {1, 12, 13}, {0, 12, 13}, {1, 15, 14}, {0, 15, 14},
+ {2, 15, 14}, {1, 14, 14}, {2, 14, 13}, {2, 14, 13}, {0, 14, 13}, {0, 14, 13}, {3, 16, 14}, {2, 16, 14},
+ {1, 16, 14}, {0, 16, 14}, {3, 15, 13}},
+
+ {{3, 7, 4}, {3, 6, 4}, {3, 5, 4}, {3, 4, 4}, {3, 3, 4}, {2, 2, 4}, {1, 1, 4}, {0, 0, 4},
+ {1, 5, 5}, {2, 5, 5}, {1, 4, 5}, {2, 4, 5}, {1, 3, 5}, {3, 8, 5}, {2, 3, 5}, {1, 2, 5},
+ {0, 3, 6}, {2, 7, 6}, {1, 7, 6}, {0, 2, 6}, {3, 9, 6}, {2, 6, 6}, {1, 6, 6}, {0, 1, 6},
+ {0, 7, 7}, {0, 6, 7}, {2, 9, 7}, {0, 5, 7}, {3, 10, 7}, {2, 8, 7}, {1, 8, 7}, {0, 4, 7},
+ {3, 12, 8}, {2, 11, 8}, {1, 10, 8}, {0, 9, 8}, {3, 11, 8}, {2, 10, 8}, {1, 9, 8}, {0, 8, 8},
+ {0, 12, 9}, {2, 13, 9}, {1, 12, 9}, {0, 11, 9}, {3, 13, 9}, {2, 12, 9}, {1, 11, 9}, {0, 10, 9},
+ {1, 15, 10}, {0, 14, 10}, {3, 14, 10}, {2, 14, 10}, {1, 14, 10}, {0, 13, 10}, {1, 13, 9}, {1, 13, 9},
+ {1, 16, 10}, {0, 15, 10}, {3, 15, 10}, {2, 15, 10}, {3, 16, 10}, {2, 16, 10}, {0, 16, 10}, { -1, -1, -1},
+ { -1, -1, -1}, { -1, -1, -1}, { -1, -1, -1}}
+};
+
+
+const ShiftOffset NumCoeffTrailOnes_indx[3][15] =
+{
+ {{15, -1}, {14, 0}, {13, 1}, {10, -1}, {9, 3}, {8, 7}, {7, 11}, {6, 15},
+ {5, 19}, {3, 19}, {2, 27}, {1, 35}, {0, 43}, {0, 55}, {1, 62}},
+
+ {{14, -2}, {12, -2}, {10, -2}, {10, 10}, {9, 14}, {8, 18}, {7, 22}, {5, 22},
+ {4, 30}, {3, 38}, {2, 46}, {2, 58}, {3, 65}, {16, 0}, {16, 0}},
+
+ {{12, -8}, {11, 0}, {10, 8}, {9, 16}, {8, 24}, {7, 32}, {6, 40}, {6, 52},
+ {6, 58}, {6, 61}, {16, 0}, {16, 0}, {16, 0}, {16, 0}, {16, 0}}
+};
+
+const static int nC_table[8] = {0, 0, 1, 1, 2, 2, 2, 2};
+
+#endif
+/**
+See algorithm in subclause 9.1, Table 9-1, Table 9-2. */
+AVCDec_Status ue_v(AVCDecBitstream *bitstream, uint *codeNum)
+{
+ uint temp, tmp_cnt;
+ int leading_zeros = 0;
+ BitstreamShowBits(bitstream, 16, &temp);
+ tmp_cnt = temp | 0x1;
+
+ PV_CLZ(leading_zeros, tmp_cnt)
+
+ if (leading_zeros < 8)
+ {
+ *codeNum = (temp >> (15 - (leading_zeros << 1))) - 1;
+ BitstreamFlushBits(bitstream, (leading_zeros << 1) + 1);
+ }
+ else
+ {
+ BitstreamReadBits(bitstream, (leading_zeros << 1) + 1, &temp);
+ *codeNum = temp - 1;
+ }
+
+ return AVCDEC_SUCCESS;
+}
+
+/**
+See subclause 9.1.1, Table 9-3 */
+AVCDec_Status se_v(AVCDecBitstream *bitstream, int *value)
+{
+ uint temp, tmp_cnt;
+ int leading_zeros = 0;
+ BitstreamShowBits(bitstream, 16, &temp);
+ tmp_cnt = temp | 0x1;
+
+ PV_CLZ(leading_zeros, tmp_cnt)
+
+ if (leading_zeros < 8)
+ {
+ temp >>= (15 - (leading_zeros << 1));
+ BitstreamFlushBits(bitstream, (leading_zeros << 1) + 1);
+ }
+ else
+ {
+ BitstreamReadBits(bitstream, (leading_zeros << 1) + 1, &temp);
+ }
+
+ *value = temp >> 1;
+
+ if (temp & 0x01) // lsb is signed bit
+ *value = -(*value);
+
+// leading_zeros = temp >> 1;
+// *value = leading_zeros - (leading_zeros*2*(temp&1));
+
+ return AVCDEC_SUCCESS;
+}
+
+AVCDec_Status se_v32bit(AVCDecBitstream *bitstream, int32 *value)
+{
+ int leadingZeros;
+ uint32 infobits;
+ uint32 codeNum;
+
+ if (AVCDEC_SUCCESS != GetEGBitstring32bit(bitstream, &leadingZeros, &infobits))
+ return AVCDEC_FAIL;
+
+ codeNum = (1 << leadingZeros) - 1 + infobits;
+
+ *value = (codeNum + 1) / 2;
+
+ if ((codeNum & 0x01) == 0) // lsb is signed bit
+ *value = -(*value);
+
+ return AVCDEC_SUCCESS;
+}
+
+
+AVCDec_Status te_v(AVCDecBitstream *bitstream, uint *value, uint range)
+{
+ if (range > 1)
+ {
+ ue_v(bitstream, value);
+ }
+ else
+ {
+ BitstreamRead1Bit(bitstream, value);
+ *value = 1 - (*value);
+ }
+ return AVCDEC_SUCCESS;
+}
+
+
+
+/* This function is only used for syntax with range from -2^31 to 2^31-1 */
+/* only a few of them in the SPS and PPS */
+AVCDec_Status GetEGBitstring32bit(AVCDecBitstream *bitstream, int *leadingZeros, uint32 *infobits)
+{
+ int bit_value;
+ uint info_temp;
+
+ *leadingZeros = 0;
+
+ BitstreamRead1Bit(bitstream, (uint*)&bit_value);
+
+ while (!bit_value)
+ {
+ (*leadingZeros)++;
+ BitstreamRead1Bit(bitstream, (uint*)&bit_value);
+ }
+
+ if (*leadingZeros > 0)
+ {
+ if (sizeof(uint) == 4) /* 32 bit machine */
+ {
+ BitstreamReadBits(bitstream, *leadingZeros, (uint*)&info_temp);
+ *infobits = (uint32)info_temp;
+ }
+ else if (sizeof(uint) == 2) /* 16 bit machine */
+ {
+ *infobits = 0;
+ if (*leadingZeros > 16)
+ {
+ BitstreamReadBits(bitstream, 16, (uint*)&info_temp);
+ (*leadingZeros) -= 16;
+ *infobits = ((uint32)info_temp) << (*leadingZeros);
+ }
+
+ BitstreamReadBits(bitstream, *leadingZeros, (uint*)&info_temp);
+ *infobits |= (uint32)info_temp ;
+ }
+ }
+ else
+ *infobits = 0;
+
+ return AVCDEC_SUCCESS;
+}
+
+/* see Table 9-4 assignment of codeNum to values of coded_block_pattern. */
+const static uint8 MapCBP[48][2] =
+{
+ {47, 0}, {31, 16}, {15, 1}, { 0, 2}, {23, 4}, {27, 8}, {29, 32}, {30, 3}, { 7, 5}, {11, 10}, {13, 12}, {14, 15},
+ {39, 47}, {43, 7}, {45, 11}, {46, 13}, {16, 14}, { 3, 6}, { 5, 9}, {10, 31}, {12, 35}, {19, 37}, {21, 42}, {26, 44},
+ {28, 33}, {35, 34}, {37, 36}, {42, 40}, {44, 39}, { 1, 43}, { 2, 45}, { 4, 46}, { 8, 17}, {17, 18}, {18, 20}, {20, 24},
+ {24, 19}, { 6, 21}, { 9, 26}, {22, 28}, {25, 23}, {32, 27}, {33, 29}, {34, 30}, {36, 22}, {40, 25}, {38, 38}, {41, 41},
+};
+
+AVCDec_Status DecodeCBP(AVCMacroblock *currMB, AVCDecBitstream *stream)
+{
+ uint codeNum;
+ uint coded_block_pattern;
+
+ ue_v(stream, &codeNum);
+
+ if (codeNum > 47)
+ {
+ return AVCDEC_FAIL;
+ }
+
+ /* can get rid of the if _OPTIMIZE */
+ if (currMB->mbMode == AVC_I4)
+ {
+ coded_block_pattern = MapCBP[codeNum][0];
+ }
+ else
+ {
+ coded_block_pattern = MapCBP[codeNum][1];
+ }
+
+// currMB->cbpL = coded_block_pattern&0xF; /* modulo 16 */
+// currMB->cbpC = coded_block_pattern>>4; /* divide 16 */
+ currMB->CBP = coded_block_pattern;
+
+ return AVCDEC_SUCCESS;
+}
+
+
+/* TO BE OPTIMIZED !!!!! */
+AVCDec_Status ce_TotalCoeffTrailingOnes(AVCDecBitstream *stream, int *TrailingOnes, int *TotalCoeff, int nC)
+{
+#ifdef PV_NO_CLZ
+ const static uint8 TotCofNTrail1[75][3] = {{0, 0, 16}/*error */, {0, 0, 16}/*error */, {1, 13, 15}, {1, 13, 15}, {0, 16, 16}, {2, 16, 16}, {1, 16, 16}, {0, 15, 16},
+ {3, 16, 16}, {2, 15, 16}, {1, 15, 16}, {0, 14, 16}, {3, 15, 16}, {2, 14, 16}, {1, 14, 16}, {0, 13, 16},
+ {3, 14, 15}, {2, 13, 15}, {1, 12, 15}, {0, 12, 15}, {3, 13, 15}, {2, 12, 15}, {1, 11, 15}, {0, 11, 15},
+ {3, 12, 14}, {2, 11, 14}, {1, 10, 14}, {0, 10, 14}, {3, 11, 14}, {2, 10, 14}, {1, 9, 14}, {0, 9, 14},
+ {0, 8, 13}, {2, 9, 13}, {1, 8, 13}, {0, 7, 13}, {3, 10, 13}, {2, 8, 13}, {1, 7, 13}, {0, 6, 13},
+ {3, 9, 11}, {2, 7, 11}, {1, 6, 11}, {0, 5, 11}, {3, 8, 10},
+ {2, 6, 10}, {1, 5, 10}, {0, 4, 10}, {3, 7, 9}, {2, 5, 9}, {1, 4, 9}, {0, 3, 9}, {3, 6, 8},
+ {2, 4, 8}, {1, 3, 8}, {0, 2, 8}, {3, 5, 7}, {2, 3, 7}, {3, 4, 6}, {3, 4, 6}, {1, 2, 6},
+ {1, 2, 6}, {0, 1, 6}, {0, 1, 6}, {3, 3, 5}, {3, 3, 5}, {3, 3, 5}, {3, 3, 5}, {2, 2, 3},
+ {1, 1, 2}, {1, 1, 2}, {0, 0, 1}, {0, 0, 1}, {0, 0, 1}, {0, 0, 1}
+ };
+
+ const static uint8 TotCofNTrail2[84][3] = {{0, 0, 14 /* error */}, {0, 0, 14/*error */}, {3, 15, 13}, {3, 15, 13}, {3, 16, 14}, {2, 16, 14}, {1, 16, 14}, {0, 16, 14},
+ {1, 15, 14}, {0, 15, 14}, {2, 15, 14}, {1, 14, 14}, {2, 14, 13}, {2, 14, 13}, {0, 14, 13}, {0, 14, 13},
+ {3, 14, 13}, {2, 13, 13}, {1, 13, 13}, {0, 13, 13}, {3, 13, 13}, {2, 12, 13}, {1, 12, 13}, {0, 12, 13},
+ {0, 11, 12}, {2, 11, 12}, {1, 11, 12}, {0, 10, 12}, {3, 12, 12}, {2, 10, 12}, {1, 10, 12}, {0, 9, 12},
+ {3, 11, 11}, {2, 9, 11}, {1, 9, 11}, {0, 8, 11}, {3, 10, 11}, {2, 8, 11}, {1, 8, 11}, {0, 7, 11},
+ {3, 9, 9}, {2, 7, 9}, {1, 7, 9}, {0, 6, 9}, {0, 5, 8}, {0, 5, 8}, {2, 6, 8}, {2, 6, 8},
+ {1, 6, 8}, {1, 6, 8}, {0, 4, 8}, {0, 4, 8}, {3, 8, 7}, {2, 5, 7}, {1, 5, 7}, {0, 3, 7},
+ {3, 7, 6}, {3, 7, 6}, {2, 4, 6}, {2, 4, 6}, {1, 4, 6}, {1, 4, 6}, {0, 2, 6}, {0, 2, 6},
+ {3, 6, 6}, {2, 3, 6}, {1, 3, 6}, {0, 1, 6}, {3, 5, 5}, {3, 5, 5}, {1, 2, 5}, {1, 2, 5},
+ {3, 4, 4}, {3, 3, 4}, {2, 2, 3}, {2, 2, 3}, {1, 1, 2}, {1, 1, 2}, {1, 1, 2}, {1, 1, 2},
+ {0, 0, 2}, {0, 0, 2}, {0, 0, 2}, {0, 0, 2}
+ };
+
+ const static uint8 TotCofNTrail3[64][3] = {{0, 0, 10/*error*/}, {0, 16, 10}, {3, 16, 10}, {2, 16, 10}, {1, 16, 10}, {0, 15, 10}, {3, 15, 10},
+ {2, 15, 10}, {1, 15, 10}, {0, 14, 10}, {3, 14, 10}, {2, 14, 10}, {1, 14, 10}, {0, 13, 10}, {1, 13, 9},
+ {1, 13, 9}, {0, 12, 9}, {2, 13, 9}, {1, 12, 9}, {0, 11, 9}, {3, 13, 9}, {2, 12, 9}, {1, 11, 9},
+ {0, 10, 9}, {3, 12, 8}, {2, 11, 8}, {1, 10, 8}, {0, 9, 8}, {3, 11, 8}, {2, 10, 8}, {1, 9, 8},
+ {0, 8, 8}, {0, 7, 7}, {0, 6, 7}, {2, 9, 7}, {0, 5, 7}, {3, 10, 7}, {2, 8, 7}, {1, 8, 7},
+ {0, 4, 7}, {0, 3, 6}, {2, 7, 6}, {1, 7, 6}, {0, 2, 6}, {3, 9, 6}, {2, 6, 6}, {1, 6, 6},
+ {0, 1, 6}, {1, 5, 5}, {2, 5, 5}, {1, 4, 5}, {2, 4, 5}, {1, 3, 5}, {3, 8, 5}, {2, 3, 5},
+ {1, 2, 5}, {3, 7, 4}, {3, 6, 4}, {3, 5, 4}, {3, 4, 4}, {3, 3, 4}, {2, 2, 4}, {1, 1, 4},
+ {0, 0, 4}
+ };
+#endif
+ uint code;
+
+#ifdef PV_NO_CLZ
+ uint8 *pcode;
+ if (nC < 2)
+ {
+ BitstreamShowBits(stream, 16, &code);
+
+ if (code >= 8192)
+ {
+ pcode = (uint8*) & (TotCofNTrail1[(code>>13)+65+2][0]);
+ }
+ else if (code >= 2048)
+ {
+ pcode = (uint8*) & (TotCofNTrail1[(code>>9)+50+2][0]);
+ }
+ else if (code >= 1024)
+ {
+ pcode = (uint8*) & (TotCofNTrail1[(code>>8)+46+2][0]);
+ }
+ else if (code >= 512)
+ {
+ pcode = (uint8*) & (TotCofNTrail1[(code>>7)+42+2][0]);
+ }
+ else if (code >= 256)
+ {
+ pcode = (uint8*) & (TotCofNTrail1[(code>>6)+38+2][0]);
+ }
+ else if (code >= 128)
+ {
+ pcode = (uint8*) & (TotCofNTrail1[(code>>5)+34+2][0]);
+ }
+ else if (code >= 64)
+ {
+ pcode = (uint8*) & (TotCofNTrail1[(code>>3)+22+2][0]);
+ }
+ else if (code >= 32)
+ {
+ pcode = (uint8*) & (TotCofNTrail1[(code>>2)+14+2][0]);
+ }
+ else if (code >= 16)
+ {
+ pcode = (uint8*) & (TotCofNTrail1[(code>>1)+6+2][0]);
+ }
+ else
+ {
+ pcode = (uint8*) & (TotCofNTrail1[(code-2)+2][0]);
+ }
+
+ *TrailingOnes = pcode[0];
+ *TotalCoeff = pcode[1];
+
+ BitstreamFlushBits(stream, pcode[2]);
+ }
+ else if (nC < 4)
+ {
+ BitstreamShowBits(stream, 14, &code);
+
+ if (code >= 4096)
+ {
+ pcode = (uint8*) & (TotCofNTrail2[(code>>10)+66+2][0]);
+ }
+ else if (code >= 2048)
+ {
+ pcode = (uint8*) & (TotCofNTrail2[(code>>8)+54+2][0]);
+ }
+ else if (code >= 512)
+ {
+ pcode = (uint8*) & (TotCofNTrail2[(code>>7)+46+2][0]);
+ }
+ else if (code >= 128)
+ {
+ pcode = (uint8*) & (TotCofNTrail2[(code>>5)+34+2][0]);
+ }
+ else if (code >= 64)
+ {
+ pcode = (uint8*) & (TotCofNTrail2[(code>>3)+22+2][0]);
+ }
+ else if (code >= 32)
+ {
+ pcode = (uint8*) & (TotCofNTrail2[(code>>2)+14+2][0]);
+ }
+ else if (code >= 16)
+ {
+ pcode = (uint8*) & (TotCofNTrail2[(code>>1)+6+2][0]);
+ }
+ else
+ {
+ pcode = (uint8*) & (TotCofNTrail2[code-2+2][0]);
+ }
+ *TrailingOnes = pcode[0];
+ *TotalCoeff = pcode[1];
+
+ BitstreamFlushBits(stream, pcode[2]);
+ }
+ else if (nC < 8)
+ {
+ BitstreamShowBits(stream, 10, &code);
+
+ if (code >= 512)
+ {
+ pcode = (uint8*) & (TotCofNTrail3[(code>>6)+47+1][0]);
+ }
+ else if (code >= 256)
+ {
+ pcode = (uint8*) & (TotCofNTrail3[(code>>5)+39+1][0]);
+ }
+ else if (code >= 128)
+ {
+ pcode = (uint8*) & (TotCofNTrail3[(code>>4)+31+1][0]);
+ }
+ else if (code >= 64)
+ {
+ pcode = (uint8*) & (TotCofNTrail3[(code>>3)+23+1][0]);
+ }
+ else if (code >= 32)
+ {
+ pcode = (uint8*) & (TotCofNTrail3[(code>>2)+15+1][0]);
+ }
+ else if (code >= 16)
+ {
+ pcode = (uint8*) & (TotCofNTrail3[(code>>1)+7+1][0]);
+ }
+ else
+ {
+ pcode = (uint8*) & (TotCofNTrail3[code-1+1][0]);
+ }
+ *TrailingOnes = pcode[0];
+ *TotalCoeff = pcode[1];
+
+ BitstreamFlushBits(stream, pcode[2]);
+ }
+ else
+ {
+ /* read 6 bit FLC */
+ BitstreamReadBits(stream, 6, &code);
+
+
+ *TrailingOnes = code & 3;
+ *TotalCoeff = (code >> 2) + 1;
+
+ if (*TotalCoeff > 16)
+ {
+ *TotalCoeff = 16; // _ERROR
+ }
+
+ if (code == 3)
+ {
+ *TrailingOnes = 0;
+ (*TotalCoeff)--;
+ }
+ }
+#else
+ const VLCNumCoeffTrail *ptr;
+ const ShiftOffset *ptr_indx;
+ uint temp, leading_zeros = 0;
+
+ if (nC < 8)
+ {
+
+ BitstreamShowBits(stream, 16, &code);
+ temp = code | 1;
+
+ PV_CLZ(leading_zeros, temp)
+
+ temp = nC_table[nC];
+ ptr_indx = &NumCoeffTrailOnes_indx[temp][leading_zeros];
+ ptr = &NumCoeffTrailOnes[temp][(code >> ptr_indx->shift) + ptr_indx->offset];
+ *TrailingOnes = ptr->trailing;
+ *TotalCoeff = ptr->total_coeff;
+ BitstreamFlushBits(stream, ptr->length);
+ }
+ else
+ {
+ /* read 6 bit FLC */
+ BitstreamReadBits(stream, 6, &code);
+
+
+ *TrailingOnes = code & 3;
+ *TotalCoeff = (code >> 2) + 1;
+
+ if (*TotalCoeff > 16)
+ {
+ *TotalCoeff = 16; // _ERROR
+ }
+
+ if (code == 3)
+ {
+ *TrailingOnes = 0;
+ (*TotalCoeff)--;
+ }
+ }
+#endif
+ return AVCDEC_SUCCESS;
+}
+
+/* TO BE OPTIMIZED !!!!! */
+AVCDec_Status ce_TotalCoeffTrailingOnesChromaDC(AVCDecBitstream *stream, int *TrailingOnes, int *TotalCoeff)
+{
+ AVCDec_Status status;
+
+ const static uint8 TotCofNTrail5[21][3] =
+ {
+ {3, 4, 7}, {3, 4, 7}, {2, 4, 8}, {1, 4, 8}, {2, 3, 7}, {2, 3, 7}, {1, 3, 7},
+ {1, 3, 7}, {0, 4, 6}, {0, 3, 6}, {0, 2, 6}, {3, 3, 6}, {1, 2, 6}, {0, 1, 6},
+ {2, 2, 3}, {0, 0, 2}, {0, 0, 2}, {1, 1, 1}, {1, 1, 1}, {1, 1, 1}, {1, 1, 1}
+ };
+
+ uint code;
+ uint8 *pcode;
+
+ status = BitstreamShowBits(stream, 8, &code);
+
+ if (code >= 32)
+ {
+ pcode = (uint8*) & (TotCofNTrail5[(code>>5)+13][0]);
+ }
+ else if (code >= 8)
+ {
+ pcode = (uint8*) & (TotCofNTrail5[(code>>2)+6][0]);
+ }
+ else
+ {
+ pcode = (uint8*) & (TotCofNTrail5[code][0]);
+ }
+
+ *TrailingOnes = pcode[0];
+ *TotalCoeff = pcode[1];
+
+ BitstreamFlushBits(stream, pcode[2]);
+
+ return status;
+}
+
+/* see Table 9-6 */
+AVCDec_Status ce_LevelPrefix(AVCDecBitstream *stream, uint *code)
+{
+ uint temp;
+ uint leading_zeros = 0;
+ BitstreamShowBits(stream, 16, &temp);
+ temp |= 1 ;
+
+ PV_CLZ(leading_zeros, temp)
+
+ BitstreamFlushBits(stream, leading_zeros + 1);
+ *code = leading_zeros;
+ return AVCDEC_SUCCESS;
+}
+
+/* see Table 9-7 and 9-8 */
+AVCDec_Status ce_TotalZeros(AVCDecBitstream *stream, int *code, int TotalCoeff)
+{
+ const static uint8 TotZero1[28][2] = {{15, 9}, {14, 9}, {13, 9}, {12, 8},
+ {12, 8}, {11, 8}, {11, 8}, {10, 7}, {9, 7}, {8, 6}, {8, 6}, {7, 6}, {7, 6}, {6, 5}, {6, 5},
+ {6, 5}, {6, 5}, {5, 5}, {5, 5}, {5, 5}, {5, 5}, {4, 4}, {3, 4},
+ {2, 3}, {2, 3}, {1, 3}, {1, 3}, {0, 1}
+ };
+
+ const static uint8 TotZero2n3[2][18][2] = {{{14, 6}, {13, 6}, {12, 6}, {11, 6},
+ {10, 5}, {10, 5}, {9, 5}, {9, 5}, {8, 4}, {7, 4}, {6, 4}, {5, 4}, {4, 3}, {4, 3},
+ {3, 3}, {2, 3}, {1, 3}, {0, 3}},
+
+ /*const static uint8 TotZero3[18][2]=*/{{13, 6}, {11, 6}, {12, 5}, {12, 5}, {10, 5},
+ {10, 5}, {9, 5}, {9, 5}, {8, 4}, {5, 4}, {4, 4}, {0, 4}, {7, 3}, {7, 3}, {6, 3}, {3, 3},
+ {2, 3}, {1, 3}}
+ };
+
+ const static uint8 TotZero4[17][2] = {{12, 5}, {11, 5}, {10, 5}, {0, 5}, {9, 4},
+ {9, 4}, {7, 4}, {7, 4}, {3, 4}, {3, 4}, {2, 4}, {2, 4}, {8, 3}, {6, 3}, {5, 3}, {4, 3}, {1, 3}
+ };
+
+ const static uint8 TotZero5[13][2] = {{11, 5}, {9, 5}, {10, 4}, {8, 4}, {2, 4},
+ {1, 4}, {0, 4}, {7, 3}, {7, 3}, {6, 3}, {5, 3}, {4, 3}, {3, 3}
+ };
+
+ const static uint8 TotZero6to10[5][15][2] = {{{10, 6}, {0, 6}, {1, 5}, {1, 5}, {8, 4},
+ {8, 4}, {8, 4}, {8, 4}, {9, 3}, {7, 3}, {6, 3}, {5, 3}, {4, 3}, {3, 3}, {2, 3}},
+
+ /*const static uint8 TotZero7[15][2]=*/{{9, 6}, {0, 6}, {1, 5}, {1, 5}, {7, 4},
+ {7, 4}, {7, 4}, {7, 4}, {8, 3}, {6, 3}, {4, 3}, {3, 3}, {2, 3}, {5, 2}, {5, 2}},
+
+ /*const static uint8 TotZero8[15][2]=*/{{8, 6}, {0, 6}, {2, 5}, {2, 5}, {1, 4},
+ {1, 4}, {1, 4}, {1, 4}, {7, 3}, {6, 3}, {3, 3}, {5, 2}, {5, 2}, {4, 2}, {4, 2}},
+
+ /*const static uint8 TotZero9[15][2]=*/{{1, 6}, {0, 6}, {7, 5}, {7, 5}, {2, 4},
+ {2, 4}, {2, 4}, {2, 4}, {5, 3}, {6, 2}, {6, 2}, {4, 2}, {4, 2}, {3, 2}, {3, 2}},
+
+ /*const static uint8 TotZero10[11][2]=*/{{1, 5}, {0, 5}, {6, 4}, {6, 4}, {2, 3},
+ {2, 3}, {2, 3}, {2, 3}, {5, 2}, {4, 2}, {3, 2}, {0, 0}, {0, 0}, {0, 0}, {0, 0}}
+ };
+
+ const static uint8 TotZero11[7][2] = {{0, 4}, {1, 4}, {2, 3}, {2, 3}, {3, 3}, {5, 3}, {4, 1}};
+
+ const static uint8 TotZero12to15[4][5][2] =
+ {
+ {{3, 1}, {2, 2}, {4, 3}, {1, 4}, {0, 4}},
+ {{2, 1}, {3, 2}, {1, 3}, {0, 3}, {0, 0}},
+ {{2, 1}, {1, 2}, {0, 2}, {0, 0}, {0, 0}},
+ {{1, 1}, {0, 1}, {0, 0}, {0, 0}, {0, 0}}
+ };
+
+ uint temp, mask;
+ int indx;
+ uint8 *pcode;
+
+ if (TotalCoeff == 1)
+ {
+ BitstreamShowBits(stream, 9, &temp);
+
+ if (temp >= 256)
+ {
+ pcode = (uint8*) & (TotZero1[27][0]);
+ }
+ else if (temp >= 64)
+ {
+ pcode = (uint8*) & (TotZero1[(temp>>5)+19][0]);
+ }
+ else if (temp >= 8)
+ {
+ pcode = (uint8*) & (TotZero1[(temp>>2)+5][0]);
+ }
+ else
+ {
+ pcode = (uint8*) & (TotZero1[temp-1][0]);
+ }
+
+ }
+ else if (TotalCoeff == 2 || TotalCoeff == 3)
+ {
+ BitstreamShowBits(stream, 6, &temp);
+
+ if (temp >= 32)
+ {
+ pcode = (uint8*) & (TotZero2n3[TotalCoeff-2][(temp>>3)+10][0]);
+ }
+ else if (temp >= 8)
+ {
+ pcode = (uint8*) & (TotZero2n3[TotalCoeff-2][(temp>>2)+6][0]);
+ }
+ else
+ {
+ pcode = (uint8*) & (TotZero2n3[TotalCoeff-2][temp][0]);
+ }
+ }
+ else if (TotalCoeff == 4)
+ {
+ BitstreamShowBits(stream, 5, &temp);
+
+ if (temp >= 12)
+ {
+ pcode = (uint8*) & (TotZero4[(temp>>2)+9][0]);
+ }
+ else
+ {
+ pcode = (uint8*) & (TotZero4[temp][0]);
+ }
+ }
+ else if (TotalCoeff == 5)
+ {
+ BitstreamShowBits(stream, 5, &temp);
+
+ if (temp >= 16)
+ {
+ pcode = (uint8*) & (TotZero5[(temp>>2)+5][0]);
+ }
+ else if (temp >= 2)
+ {
+ pcode = (uint8*) & (TotZero5[(temp>>1)+1][0]);
+ }
+ else
+ {
+ pcode = (uint8*) & (TotZero5[temp][0]);
+ }
+ }
+ else if (TotalCoeff >= 6 && TotalCoeff <= 10)
+ {
+ if (TotalCoeff == 10)
+ {
+ BitstreamShowBits(stream, 5, &temp);
+ }
+ else
+ {
+ BitstreamShowBits(stream, 6, &temp);
+ }
+
+
+ if (temp >= 8)
+ {
+ pcode = (uint8*) & (TotZero6to10[TotalCoeff-6][(temp>>3)+7][0]);
+ }
+ else
+ {
+ pcode = (uint8*) & (TotZero6to10[TotalCoeff-6][temp][0]);
+ }
+ }
+ else if (TotalCoeff == 11)
+ {
+ BitstreamShowBits(stream, 4, &temp);
+
+
+ if (temp >= 8)
+ {
+ pcode = (uint8*) & (TotZero11[6][0]);
+ }
+ else if (temp >= 4)
+ {
+ pcode = (uint8*) & (TotZero11[(temp>>1)+2][0]);
+ }
+ else
+ {
+ pcode = (uint8*) & (TotZero11[temp][0]);
+ }
+ }
+ else
+ {
+ BitstreamShowBits(stream, (16 - TotalCoeff), &temp);
+ mask = 1 << (15 - TotalCoeff);
+ indx = 0;
+ while ((temp&mask) == 0 && indx < (16 - TotalCoeff)) /* search location of 1 bit */
+ {
+ mask >>= 1;
+ indx++;
+ }
+
+ pcode = (uint8*) & (TotZero12to15[TotalCoeff-12][indx]);
+ }
+
+ *code = pcode[0];
+ BitstreamFlushBits(stream, pcode[1]);
+
+ return AVCDEC_SUCCESS;
+}
+
+/* see Table 9-9 */
+AVCDec_Status ce_TotalZerosChromaDC(AVCDecBitstream *stream, int *code, int TotalCoeff)
+{
+ const static uint8 TotZeroChrom1to3[3][8][2] =
+ {
+ {{3, 3}, {2, 3}, {1, 2}, {1, 2}, {0, 1}, {0, 1}, {0, 1}, {0, 1}},
+ {{2, 2}, {2, 2}, {1, 2}, {1, 2}, {0, 1}, {0, 1}, {0, 1}, {0, 1}},
+ {{1, 1}, {1, 1}, {1, 1}, {1, 1}, {0, 1}, {0, 1}, {0, 1}, {0, 1}},
+ };
+
+
+ uint temp;
+ uint8 *pcode;
+
+ BitstreamShowBits(stream, 3, &temp);
+ pcode = (uint8*) & (TotZeroChrom1to3[TotalCoeff-1][temp]);
+
+ *code = pcode[0];
+
+ BitstreamFlushBits(stream, pcode[1]);
+
+ return AVCDEC_SUCCESS;
+}
+
+/* see Table 9-10 */
+AVCDec_Status ce_RunBefore(AVCDecBitstream *stream, int *code, int zerosLeft)
+{
+ const static int codlen[6] = {1, 2, 2, 3, 3, 3}; /* num bits to read */
+ const static uint8 RunBeforeTab[6][8][2] = {{{1, 1}, {0, 1}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}},
+ /*const static int RunBefore2[4][2]=*/{{2, 2}, {1, 2}, {0, 1}, {0, 1}, {0, 0}, {0, 0}, {0, 0}, {0, 0}},
+ /*const static int RunBefore3[4][2]=*/{{3, 2}, {2, 2}, {1, 2}, {0, 2}, {0, 0}, {0, 0}, {0, 0}, {0, 0}},
+ /*const static int RunBefore4[7][2]=*/{{4, 3}, {3, 3}, {2, 2}, {2, 2}, {1, 2}, {1, 2}, {0, 2}, {0, 2}},
+ /*const static int RunBefore5[7][2]=*/{{5, 3}, {4, 3}, {3, 3}, {2, 3}, {1, 2}, {1, 2}, {0, 2}, {0, 2}},
+ /*const static int RunBefore6[7][2]=*/{{1, 3}, {2, 3}, {4, 3}, {3, 3}, {6, 3}, {5, 3}, {0, 2}, {0, 2}}
+ };
+
+ uint temp;
+ uint8 *pcode;
+ int indx;
+
+ if (zerosLeft <= 6)
+ {
+ BitstreamShowBits(stream, codlen[zerosLeft-1], &temp);
+
+ pcode = (uint8*) & (RunBeforeTab[zerosLeft-1][temp][0]);
+
+ *code = pcode[0];
+
+ BitstreamFlushBits(stream, pcode[1]);
+ }
+ else
+ {
+ BitstreamReadBits(stream, 3, &temp);
+ if (temp)
+ {
+ *code = 7 - temp;
+ }
+ else
+ {
+ BitstreamShowBits(stream, 9, &temp);
+ temp <<= 7;
+ temp |= 1;
+ indx = 0;
+ PV_CLZ(indx, temp)
+ *code = 7 + indx;
+ BitstreamFlushBits(stream, indx + 1);
+ }
+ }
+
+
+ return AVCDEC_SUCCESS;
+}
generated by cgit v1.1 at 2024-08-02 09:52:07 +0000