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-rwxr-xr-xmedia/libstagefright/codecs/on2/h264dec/source/h264bsd_cavlc.c916
1 files changed, 916 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/on2/h264dec/source/h264bsd_cavlc.c b/media/libstagefright/codecs/on2/h264dec/source/h264bsd_cavlc.c
new file mode 100755
index 0000000..91d78bd
--- /dev/null
+++ b/media/libstagefright/codecs/on2/h264dec/source/h264bsd_cavlc.c
@@ -0,0 +1,916 @@
+/*
+ * Copyright (C) 2009 The Android Open Source Project
+ *
+ * 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.
+ */
+
+/*------------------------------------------------------------------------------
+
+ Table of contents
+
+ 1. Include headers
+ 2. External compiler flags
+ 3. Module defines
+ 4. Local function prototypes
+ 5. Functions
+ DecodeCoeffToken
+ DecodeLevelPrefix
+ DecodeTotalZeros
+ DecodeRunBefore
+ DecodeResidualBlockCavlc
+
+------------------------------------------------------------------------------*/
+
+/*------------------------------------------------------------------------------
+ 1. Include headers
+------------------------------------------------------------------------------*/
+
+#include "h264bsd_cavlc.h"
+#include "h264bsd_util.h"
+
+/*------------------------------------------------------------------------------
+ 2. External compiler flags
+--------------------------------------------------------------------------------
+
+--------------------------------------------------------------------------------
+ 3. Module defines
+------------------------------------------------------------------------------*/
+
+/* Following descriptions use term "information field" to represent combination
+ * of certain decoded symbol value and the length of the corresponding variable
+ * length code word. For example, total_zeros information field consists of
+ * 4 bits symbol value (bits [4,7]) along with four bits to represent length
+ * of the VLC code word (bits [0,3]) */
+
+/* macro to obtain length of the coeff token information field, bits [0,4] */
+#define LENGTH_TC(vlc) ((vlc) & 0x1F)
+/* macro to obtain length of the other information fields, bits [0,3] */
+#define LENGTH(vlc) ((vlc) & 0xF)
+/* macro to obtain code word from the information fields, bits [4,7] */
+#define INFO(vlc) (((vlc) >> 4) & 0xF) /* 4 MSB bits contain information */
+/* macro to obtain trailing ones from the coeff token information word,
+ * bits [5,10] */
+#define TRAILING_ONES(coeffToken) ((coeffToken>>5) & 0x3F)
+/* macro to obtain total coeff from the coeff token information word,
+ * bits [11,15] */
+#define TOTAL_COEFF(coeffToken) (((coeffToken) >> 11) & 0x1F)
+
+#define VLC_NOT_FOUND 0xFFFFFFFEU
+
+/* VLC tables for coeff_token. Because of long codes (max. 16 bits) some of the
+ * tables have been splitted into multiple separate tables. Each array/table
+ * element has the following structure:
+ * [5 bits for tot.coeff.] [6 bits for tr.ones] [5 bits for VLC length]
+ * If there is a 0x0000 value, it means that there is not corresponding VLC
+ * codeword for that index. */
+
+/* VLC lengths up to 6 bits, 0 <= nC < 2 */
+static const u16 coeffToken0_0[32] = {
+ 0x0000,0x0000,0x0000,0x2066,0x1026,0x0806,0x1865,0x1865,
+ 0x1043,0x1043,0x1043,0x1043,0x1043,0x1043,0x1043,0x1043,
+ 0x0822,0x0822,0x0822,0x0822,0x0822,0x0822,0x0822,0x0822,
+ 0x0822,0x0822,0x0822,0x0822,0x0822,0x0822,0x0822,0x0822};
+
+/* VLC lengths up to 10 bits, 0 <= nC < 2 */
+static const u16 coeffToken0_1[48] = {
+ 0x0000,0x0000,0x0000,0x0000,0x406a,0x304a,0x282a,0x200a,
+ 0x3869,0x3869,0x2849,0x2849,0x2029,0x2029,0x1809,0x1809,
+ 0x3068,0x3068,0x3068,0x3068,0x2048,0x2048,0x2048,0x2048,
+ 0x1828,0x1828,0x1828,0x1828,0x1008,0x1008,0x1008,0x1008,
+ 0x2867,0x2867,0x2867,0x2867,0x2867,0x2867,0x2867,0x2867,
+ 0x1847,0x1847,0x1847,0x1847,0x1847,0x1847,0x1847,0x1847};
+
+/* VLC lengths up to 14 bits, 0 <= nC < 2 */
+static const u16 coeffToken0_2[56] = {
+ 0x606e,0x584e,0x502e,0x500e,0x586e,0x504e,0x482e,0x480e,
+ 0x400d,0x400d,0x484d,0x484d,0x402d,0x402d,0x380d,0x380d,
+ 0x506d,0x506d,0x404d,0x404d,0x382d,0x382d,0x300d,0x300d,
+ 0x486b,0x486b,0x486b,0x486b,0x486b,0x486b,0x486b,0x486b,
+ 0x384b,0x384b,0x384b,0x384b,0x384b,0x384b,0x384b,0x384b,
+ 0x302b,0x302b,0x302b,0x302b,0x302b,0x302b,0x302b,0x302b,
+ 0x280b,0x280b,0x280b,0x280b,0x280b,0x280b,0x280b,0x280b};
+
+/* VLC lengths up to 16 bits, 0 <= nC < 2 */
+static const u16 coeffToken0_3[32] = {
+ 0x0000,0x0000,0x682f,0x682f,0x8010,0x8050,0x8030,0x7810,
+ 0x8070,0x7850,0x7830,0x7010,0x7870,0x7050,0x7030,0x6810,
+ 0x706f,0x706f,0x684f,0x684f,0x602f,0x602f,0x600f,0x600f,
+ 0x686f,0x686f,0x604f,0x604f,0x582f,0x582f,0x580f,0x580f};
+
+/* VLC lengths up to 6 bits, 2 <= nC < 4 */
+static const u16 coeffToken2_0[32] = {
+ 0x0000,0x0000,0x0000,0x0000,0x3866,0x2046,0x2026,0x1006,
+ 0x3066,0x1846,0x1826,0x0806,0x2865,0x2865,0x1025,0x1025,
+ 0x2064,0x2064,0x2064,0x2064,0x1864,0x1864,0x1864,0x1864,
+ 0x1043,0x1043,0x1043,0x1043,0x1043,0x1043,0x1043,0x1043};
+
+/* VLC lengths up to 9 bits, 2 <= nC < 4 */
+static const u16 coeffToken2_1[32] = {
+ 0x0000,0x0000,0x0000,0x0000,0x4869,0x3849,0x3829,0x3009,
+ 0x2808,0x2808,0x3048,0x3048,0x3028,0x3028,0x2008,0x2008,
+ 0x4067,0x4067,0x4067,0x4067,0x2847,0x2847,0x2847,0x2847,
+ 0x2827,0x2827,0x2827,0x2827,0x1807,0x1807,0x1807,0x1807};
+
+/* VLC lengths up to 14 bits, 2 <= nC < 4 */
+static const u16 coeffToken2_2[128] = {
+ 0x0000,0x0000,0x786d,0x786d,0x806e,0x804e,0x802e,0x800e,
+ 0x782e,0x780e,0x784e,0x702e,0x704d,0x704d,0x700d,0x700d,
+ 0x706d,0x706d,0x684d,0x684d,0x682d,0x682d,0x680d,0x680d,
+ 0x686d,0x686d,0x604d,0x604d,0x602d,0x602d,0x600d,0x600d,
+ 0x580c,0x580c,0x580c,0x580c,0x584c,0x584c,0x584c,0x584c,
+ 0x582c,0x582c,0x582c,0x582c,0x500c,0x500c,0x500c,0x500c,
+ 0x606c,0x606c,0x606c,0x606c,0x504c,0x504c,0x504c,0x504c,
+ 0x502c,0x502c,0x502c,0x502c,0x480c,0x480c,0x480c,0x480c,
+ 0x586b,0x586b,0x586b,0x586b,0x586b,0x586b,0x586b,0x586b,
+ 0x484b,0x484b,0x484b,0x484b,0x484b,0x484b,0x484b,0x484b,
+ 0x482b,0x482b,0x482b,0x482b,0x482b,0x482b,0x482b,0x482b,
+ 0x400b,0x400b,0x400b,0x400b,0x400b,0x400b,0x400b,0x400b,
+ 0x506b,0x506b,0x506b,0x506b,0x506b,0x506b,0x506b,0x506b,
+ 0x404b,0x404b,0x404b,0x404b,0x404b,0x404b,0x404b,0x404b,
+ 0x402b,0x402b,0x402b,0x402b,0x402b,0x402b,0x402b,0x402b,
+ 0x380b,0x380b,0x380b,0x380b,0x380b,0x380b,0x380b,0x380b};
+
+/* VLC lengths up to 6 bits, 4 <= nC < 8 */
+static const u16 coeffToken4_0[64] = {
+ 0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,
+ 0x1806,0x3846,0x3826,0x1006,0x4866,0x3046,0x3026,0x0806,
+ 0x2825,0x2825,0x2845,0x2845,0x2025,0x2025,0x2045,0x2045,
+ 0x1825,0x1825,0x4065,0x4065,0x1845,0x1845,0x1025,0x1025,
+ 0x3864,0x3864,0x3864,0x3864,0x3064,0x3064,0x3064,0x3064,
+ 0x2864,0x2864,0x2864,0x2864,0x2064,0x2064,0x2064,0x2064,
+ 0x1864,0x1864,0x1864,0x1864,0x1044,0x1044,0x1044,0x1044,
+ 0x0824,0x0824,0x0824,0x0824,0x0004,0x0004,0x0004,0x0004};
+
+/* VLC lengths up to 10 bits, 4 <= nC < 8 */
+static const u16 coeffToken4_1[128] = {
+ 0x0000,0x800a,0x806a,0x804a,0x802a,0x780a,0x786a,0x784a,
+ 0x782a,0x700a,0x706a,0x704a,0x702a,0x680a,0x6829,0x6829,
+ 0x6009,0x6009,0x6849,0x6849,0x6029,0x6029,0x5809,0x5809,
+ 0x6869,0x6869,0x6049,0x6049,0x5829,0x5829,0x5009,0x5009,
+ 0x6068,0x6068,0x6068,0x6068,0x5848,0x5848,0x5848,0x5848,
+ 0x5028,0x5028,0x5028,0x5028,0x4808,0x4808,0x4808,0x4808,
+ 0x5868,0x5868,0x5868,0x5868,0x5048,0x5048,0x5048,0x5048,
+ 0x4828,0x4828,0x4828,0x4828,0x4008,0x4008,0x4008,0x4008,
+ 0x3807,0x3807,0x3807,0x3807,0x3807,0x3807,0x3807,0x3807,
+ 0x3007,0x3007,0x3007,0x3007,0x3007,0x3007,0x3007,0x3007,
+ 0x4847,0x4847,0x4847,0x4847,0x4847,0x4847,0x4847,0x4847,
+ 0x2807,0x2807,0x2807,0x2807,0x2807,0x2807,0x2807,0x2807,
+ 0x5067,0x5067,0x5067,0x5067,0x5067,0x5067,0x5067,0x5067,
+ 0x4047,0x4047,0x4047,0x4047,0x4047,0x4047,0x4047,0x4047,
+ 0x4027,0x4027,0x4027,0x4027,0x4027,0x4027,0x4027,0x4027,
+ 0x2007,0x2007,0x2007,0x2007,0x2007,0x2007,0x2007,0x2007};
+
+/* fixed 6 bit length VLC, nC <= 8 */
+static const u16 coeffToken8[64] = {
+ 0x0806,0x0826,0x0000,0x0006,0x1006,0x1026,0x1046,0x0000,
+ 0x1806,0x1826,0x1846,0x1866,0x2006,0x2026,0x2046,0x2066,
+ 0x2806,0x2826,0x2846,0x2866,0x3006,0x3026,0x3046,0x3066,
+ 0x3806,0x3826,0x3846,0x3866,0x4006,0x4026,0x4046,0x4066,
+ 0x4806,0x4826,0x4846,0x4866,0x5006,0x5026,0x5046,0x5066,
+ 0x5806,0x5826,0x5846,0x5866,0x6006,0x6026,0x6046,0x6066,
+ 0x6806,0x6826,0x6846,0x6866,0x7006,0x7026,0x7046,0x7066,
+ 0x7806,0x7826,0x7846,0x7866,0x8006,0x8026,0x8046,0x8066};
+
+/* VLC lengths up to 3 bits, nC == -1 */
+static const u16 coeffTokenMinus1_0[8] = {
+ 0x0000,0x1043,0x0002,0x0002,0x0821,0x0821,0x0821,0x0821};
+
+/* VLC lengths up to 8 bits, nC == -1 */
+static const u16 coeffTokenMinus1_1[32] = {
+ 0x2067,0x2067,0x2048,0x2028,0x1847,0x1847,0x1827,0x1827,
+ 0x2006,0x2006,0x2006,0x2006,0x1806,0x1806,0x1806,0x1806,
+ 0x1006,0x1006,0x1006,0x1006,0x1866,0x1866,0x1866,0x1866,
+ 0x1026,0x1026,0x1026,0x1026,0x0806,0x0806,0x0806,0x0806};
+
+/* VLC tables for total_zeros. One table containing longer code, totalZeros_1,
+ * has been broken into two separate tables. Table elements have the
+ * following structure:
+ * [4 bits for info] [4 bits for VLC length] */
+
+/* VLC lengths up to 5 bits */
+static const u8 totalZeros_1_0[32] = {
+ 0x00,0x00,0x65,0x55,0x44,0x44,0x34,0x34,
+ 0x23,0x23,0x23,0x23,0x13,0x13,0x13,0x13,
+ 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
+ 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01};
+
+/* VLC lengths up to 9 bits */
+static const u8 totalZeros_1_1[32] = {
+ 0x00,0xf9,0xe9,0xd9,0xc8,0xc8,0xb8,0xb8,
+ 0xa7,0xa7,0xa7,0xa7,0x97,0x97,0x97,0x97,
+ 0x86,0x86,0x86,0x86,0x86,0x86,0x86,0x86,
+ 0x76,0x76,0x76,0x76,0x76,0x76,0x76,0x76};
+
+static const u8 totalZeros_2[64] = {
+ 0xe6,0xd6,0xc6,0xb6,0xa5,0xa5,0x95,0x95,
+ 0x84,0x84,0x84,0x84,0x74,0x74,0x74,0x74,
+ 0x64,0x64,0x64,0x64,0x54,0x54,0x54,0x54,
+ 0x43,0x43,0x43,0x43,0x43,0x43,0x43,0x43,
+ 0x33,0x33,0x33,0x33,0x33,0x33,0x33,0x33,
+ 0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,
+ 0x13,0x13,0x13,0x13,0x13,0x13,0x13,0x13,
+ 0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03};
+
+static const u8 totalZeros_3[64] = {
+ 0xd6,0xb6,0xc5,0xc5,0xa5,0xa5,0x95,0x95,
+ 0x84,0x84,0x84,0x84,0x54,0x54,0x54,0x54,
+ 0x44,0x44,0x44,0x44,0x04,0x04,0x04,0x04,
+ 0x73,0x73,0x73,0x73,0x73,0x73,0x73,0x73,
+ 0x63,0x63,0x63,0x63,0x63,0x63,0x63,0x63,
+ 0x33,0x33,0x33,0x33,0x33,0x33,0x33,0x33,
+ 0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,
+ 0x13,0x13,0x13,0x13,0x13,0x13,0x13,0x13};
+
+static const u8 totalZeros_4[32] = {
+ 0xc5,0xb5,0xa5,0x05,0x94,0x94,0x74,0x74,
+ 0x34,0x34,0x24,0x24,0x83,0x83,0x83,0x83,
+ 0x63,0x63,0x63,0x63,0x53,0x53,0x53,0x53,
+ 0x43,0x43,0x43,0x43,0x13,0x13,0x13,0x13};
+
+static const u8 totalZeros_5[32] = {
+ 0xb5,0x95,0xa4,0xa4,0x84,0x84,0x24,0x24,
+ 0x14,0x14,0x04,0x04,0x73,0x73,0x73,0x73,
+ 0x63,0x63,0x63,0x63,0x53,0x53,0x53,0x53,
+ 0x43,0x43,0x43,0x43,0x33,0x33,0x33,0x33};
+
+static const u8 totalZeros_6[64] = {
+ 0xa6,0x06,0x15,0x15,0x84,0x84,0x84,0x84,
+ 0x93,0x93,0x93,0x93,0x93,0x93,0x93,0x93,
+ 0x73,0x73,0x73,0x73,0x73,0x73,0x73,0x73,
+ 0x63,0x63,0x63,0x63,0x63,0x63,0x63,0x63,
+ 0x53,0x53,0x53,0x53,0x53,0x53,0x53,0x53,
+ 0x43,0x43,0x43,0x43,0x43,0x43,0x43,0x43,
+ 0x33,0x33,0x33,0x33,0x33,0x33,0x33,0x33,
+ 0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23};
+
+static const u8 totalZeros_7[64] = {
+ 0x96,0x06,0x15,0x15,0x74,0x74,0x74,0x74,
+ 0x83,0x83,0x83,0x83,0x83,0x83,0x83,0x83,
+ 0x63,0x63,0x63,0x63,0x63,0x63,0x63,0x63,
+ 0x43,0x43,0x43,0x43,0x43,0x43,0x43,0x43,
+ 0x33,0x33,0x33,0x33,0x33,0x33,0x33,0x33,
+ 0x23,0x23,0x23,0x23,0x23,0x23,0x23,0x23,
+ 0x52,0x52,0x52,0x52,0x52,0x52,0x52,0x52,
+ 0x52,0x52,0x52,0x52,0x52,0x52,0x52,0x52};
+
+static const u8 totalZeros_8[64] = {
+ 0x86,0x06,0x25,0x25,0x14,0x14,0x14,0x14,
+ 0x73,0x73,0x73,0x73,0x73,0x73,0x73,0x73,
+ 0x63,0x63,0x63,0x63,0x63,0x63,0x63,0x63,
+ 0x33,0x33,0x33,0x33,0x33,0x33,0x33,0x33,
+ 0x52,0x52,0x52,0x52,0x52,0x52,0x52,0x52,
+ 0x52,0x52,0x52,0x52,0x52,0x52,0x52,0x52,
+ 0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,
+ 0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42};
+
+static const u8 totalZeros_9[64] = {
+ 0x16,0x06,0x75,0x75,0x24,0x24,0x24,0x24,
+ 0x53,0x53,0x53,0x53,0x53,0x53,0x53,0x53,
+ 0x62,0x62,0x62,0x62,0x62,0x62,0x62,0x62,
+ 0x62,0x62,0x62,0x62,0x62,0x62,0x62,0x62,
+ 0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,
+ 0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,
+ 0x32,0x32,0x32,0x32,0x32,0x32,0x32,0x32,
+ 0x32,0x32,0x32,0x32,0x32,0x32,0x32,0x32};
+
+static const u8 totalZeros_10[32] = {
+ 0x15,0x05,0x64,0x64,0x23,0x23,0x23,0x23,
+ 0x52,0x52,0x52,0x52,0x52,0x52,0x52,0x52,
+ 0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,
+ 0x32,0x32,0x32,0x32,0x32,0x32,0x32,0x32};
+
+static const u8 totalZeros_11[16] = {
+ 0x04,0x14,0x23,0x23,0x33,0x33,0x53,0x53,
+ 0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41};
+
+static const u8 totalZeros_12[16] = {
+ 0x04,0x14,0x43,0x43,0x22,0x22,0x22,0x22,
+ 0x31,0x31,0x31,0x31,0x31,0x31,0x31,0x31};
+
+static const u8 totalZeros_13[8] = {0x03,0x13,0x32,0x32,0x21,0x21,0x21,0x21};
+
+static const u8 totalZeros_14[4] = {0x02,0x12,0x21,0x21};
+
+/* VLC tables for run_before. Table elements have the following structure:
+ * [4 bits for info] [4bits for VLC length]
+ */
+
+static const u8 runBefore_6[8] = {0x13,0x23,0x43,0x33,0x63,0x53,0x02,0x02};
+
+static const u8 runBefore_5[8] = {0x53,0x43,0x33,0x23,0x12,0x12,0x02,0x02};
+
+static const u8 runBefore_4[8] = {0x43,0x33,0x22,0x22,0x12,0x12,0x02,0x02};
+
+static const u8 runBefore_3[4] = {0x32,0x22,0x12,0x02};
+
+static const u8 runBefore_2[4] = {0x22,0x12,0x01,0x01};
+
+static const u8 runBefore_1[2] = {0x11,0x01};
+
+/* following four macros are used to handle stream buffer "cache" in the CAVLC
+ * decoding function */
+
+/* macro to initialize stream buffer cache, fills the buffer (32 bits) */
+#define BUFFER_INIT(value, bits) \
+{ \
+ bits = 32; \
+ value = h264bsdShowBits32(pStrmData); \
+}
+
+/* macro to read numBits bits from the buffer, bits will be written to
+ * outVal. Refills the buffer if not enough bits left */
+#define BUFFER_SHOW(value, bits, outVal, numBits) \
+{ \
+ if (bits < (numBits)) \
+ { \
+ if(h264bsdFlushBits(pStrmData,32-bits) == END_OF_STREAM) \
+ return(HANTRO_NOK); \
+ value = h264bsdShowBits32(pStrmData); \
+ bits = 32; \
+ } \
+ (outVal) = value >> (32 - (numBits)); \
+}
+
+/* macro to flush numBits bits from the buffer */
+#define BUFFER_FLUSH(value, bits, numBits) \
+{ \
+ value <<= (numBits); \
+ bits -= (numBits); \
+}
+
+/* macro to read and flush numBits bits from the buffer, bits will be written
+ * to outVal. Refills the buffer if not enough bits left */
+#define BUFFER_GET(value, bits, outVal, numBits) \
+{ \
+ if (bits < (numBits)) \
+ { \
+ if(h264bsdFlushBits(pStrmData,32-bits) == END_OF_STREAM) \
+ return(HANTRO_NOK); \
+ value = h264bsdShowBits32(pStrmData); \
+ bits = 32; \
+ } \
+ (outVal) = value >> (32 - (numBits)); \
+ value <<= (numBits); \
+ bits -= (numBits); \
+}
+
+/*------------------------------------------------------------------------------
+ 4. Local function prototypes
+------------------------------------------------------------------------------*/
+
+static u32 DecodeCoeffToken(u32 bits, u32 nc);
+
+static u32 DecodeLevelPrefix(u32 bits);
+
+static u32 DecodeTotalZeros(u32 bits, u32 totalCoeff, u32 isChromaDC);
+
+static u32 DecodeRunBefore(u32 bits,u32 zerosLeft);
+
+/*------------------------------------------------------------------------------
+
+ Function: DecodeCoeffToken
+
+ Functional description:
+ Function to decode coeff_token information field from the stream.
+
+ Inputs:
+ u32 bits next 16 stream bits
+ u32 nc nC, see standard for details
+
+ Outputs:
+ u32 information field (11 bits for value, 5 bits for length)
+
+------------------------------------------------------------------------------*/
+
+u32 DecodeCoeffToken(u32 bits, u32 nc)
+{
+
+/* Variables */
+
+ u32 value;
+
+/* Code */
+
+ /* standard defines that nc for decoding of chroma dc coefficients is -1,
+ * represented by u32 here -> -1 maps to 2^32 - 1 */
+ ASSERT(nc <= 16 || nc == (u32)(-1));
+
+ if (nc < 2)
+ {
+ if (bits >= 0x8000)
+ {
+ value = 0x0001;
+ }
+ else if (bits >= 0x0C00)
+ value = coeffToken0_0[bits >> 10];
+ else if (bits >= 0x0100)
+ value = coeffToken0_1[bits >> 6];
+ else if (bits >= 0x0020)
+ value = coeffToken0_2[(bits>>2)-8];
+ else
+ value = coeffToken0_3[bits];
+ }
+ else if (nc < 4)
+ {
+ if (bits >= 0x8000)
+ {
+ value = bits & 0x4000 ? 0x0002 : 0x0822;
+ }
+ else if (bits >= 0x1000)
+ value = coeffToken2_0[bits >> 10];
+ else if (bits >= 0x0200)
+ value = coeffToken2_1[bits >> 7];
+ else
+ value = coeffToken2_2[bits>>2];
+ }
+ else if (nc < 8)
+ {
+ value = coeffToken4_0[bits >> 10];
+ if (!value)
+ value = coeffToken4_1[bits>>6];
+ }
+ else if (nc <= 16)
+ {
+ value = coeffToken8[bits>>10];
+ }
+ else
+ {
+ value = coeffTokenMinus1_0[bits >> 13];
+ if (!value)
+ value = coeffTokenMinus1_1[bits>>8];
+ }
+
+ return(value);
+
+}
+
+/*------------------------------------------------------------------------------
+
+ Function: DecodeLevelPrefix
+
+ Functional description:
+ Function to decode level_prefix information field from the stream
+
+ Inputs:
+ u32 bits next 16 stream bits
+
+ Outputs:
+ u32 level_prefix information field or VLC_NOT_FOUND
+
+------------------------------------------------------------------------------*/
+
+u32 DecodeLevelPrefix(u32 bits)
+{
+
+/* Variables */
+
+ u32 numZeros;
+
+/* Code */
+
+ if (bits >= 0x8000)
+ numZeros = 0;
+ else if (bits >= 0x4000)
+ numZeros = 1;
+ else if (bits >= 0x2000)
+ numZeros = 2;
+ else if (bits >= 0x1000)
+ numZeros = 3;
+ else if (bits >= 0x0800)
+ numZeros = 4;
+ else if (bits >= 0x0400)
+ numZeros = 5;
+ else if (bits >= 0x0200)
+ numZeros = 6;
+ else if (bits >= 0x0100)
+ numZeros = 7;
+ else if (bits >= 0x0080)
+ numZeros = 8;
+ else if (bits >= 0x0040)
+ numZeros = 9;
+ else if (bits >= 0x0020)
+ numZeros = 10;
+ else if (bits >= 0x0010)
+ numZeros = 11;
+ else if (bits >= 0x0008)
+ numZeros = 12;
+ else if (bits >= 0x0004)
+ numZeros = 13;
+ else if (bits >= 0x0002)
+ numZeros = 14;
+ else if (bits >= 0x0001)
+ numZeros = 15;
+ else /* more than 15 zeros encountered which is an error */
+ return(VLC_NOT_FOUND);
+
+ return(numZeros);
+
+}
+
+/*------------------------------------------------------------------------------
+
+ Function: DecodeTotalZeros
+
+ Functional description:
+ Function to decode total_zeros information field from the stream
+
+ Inputs:
+ u32 bits next 9 stream bits
+ u32 totalCoeff total number of coefficients for the block
+ being decoded
+ u32 isChromaDC flag to indicate chroma DC block
+
+ Outputs:
+ u32 information field (4 bits value, 4 bits length)
+
+------------------------------------------------------------------------------*/
+
+u32 DecodeTotalZeros(u32 bits, u32 totalCoeff, u32 isChromaDC)
+{
+
+/* Variables */
+
+ u32 value = 0x0;
+
+/* Code */
+
+ ASSERT(totalCoeff);
+
+ if (!isChromaDC)
+ {
+ ASSERT(totalCoeff < 16);
+ switch (totalCoeff)
+ {
+ case 1:
+ value = totalZeros_1_0[bits >> 4];
+ if (!value)
+ value = totalZeros_1_1[bits];
+ break;
+
+ case 2:
+ value = totalZeros_2[bits >> 3];
+ break;
+
+ case 3:
+ value = totalZeros_3[bits >> 3];
+ break;
+
+ case 4:
+ value = totalZeros_4[bits >> 4];
+ break;
+
+ case 5:
+ value = totalZeros_5[bits >> 4];
+ break;
+
+ case 6:
+ value = totalZeros_6[bits >> 3];
+ break;
+
+ case 7:
+ value = totalZeros_7[bits >> 3];
+ break;
+
+ case 8:
+ value = totalZeros_8[bits >> 3];
+ break;
+
+ case 9:
+ value = totalZeros_9[bits >> 3];
+ break;
+
+ case 10:
+ value = totalZeros_10[bits >> 4];
+ break;
+
+ case 11:
+ value = totalZeros_11[bits >> 5];
+ break;
+
+ case 12:
+ value = totalZeros_12[bits >> 5];
+ break;
+
+ case 13:
+ value = totalZeros_13[bits >> 6];
+ break;
+
+ case 14:
+ value = totalZeros_14[bits >> 7];
+ break;
+
+ default: /* case 15 */
+ value = (bits >> 8) ? 0x11 : 0x01;
+ break;
+ }
+ }
+ else
+ {
+ ASSERT(totalCoeff < 4);
+ bits >>= 6;
+ if (bits > 3)
+ value = 0x01;
+ else
+ {
+ if (totalCoeff == 3)
+ value = 0x11;
+ else if (bits > 1)
+ {
+ value = 0x12;
+ }
+ else if (totalCoeff == 2)
+ value = 0x22;
+ else if (bits)
+ value = 0x23;
+ else
+ value = 0x33;
+ }
+ }
+
+ return(value);
+
+}
+
+/*------------------------------------------------------------------------------
+
+ Function: DecodeRunBefore
+
+ Functional description:
+ Function to decode run_before information field from the stream
+
+ Inputs:
+ u32 bits next 11 stream bits
+ u32 zerosLeft number of zeros left for the current block
+
+ Outputs:
+ u32 information field (4 bits value, 4 bits length)
+
+------------------------------------------------------------------------------*/
+
+u32 DecodeRunBefore(u32 bits, u32 zerosLeft)
+{
+
+/* Variables */
+
+ u32 value = 0x0;
+
+/* Code */
+
+ switch (zerosLeft)
+ {
+ case 1:
+ value = runBefore_1[bits>>10];
+ break;
+
+ case 2:
+ value = runBefore_2[bits>>9];
+ break;
+
+ case 3:
+ value = runBefore_3[bits>>9];
+ break;
+
+ case 4:
+ value = runBefore_4[bits>>8];
+ break;
+
+ case 5:
+ value = runBefore_5[bits>>8];
+ break;
+
+ case 6:
+ value = runBefore_6[bits>>8];
+ break;
+
+ default:
+ if (bits >= 0x100)
+ value = ((7-(bits>>8))<<4)+0x3;
+ else if (bits >= 0x80)
+ value = 0x74;
+ else if (bits >= 0x40)
+ value = 0x85;
+ else if (bits >= 0x20)
+ value = 0x96;
+ else if (bits >= 0x10)
+ value = 0xa7;
+ else if (bits >= 0x8)
+ value = 0xb8;
+ else if (bits >= 0x4)
+ value = 0xc9;
+ else if (bits >= 0x2)
+ value = 0xdA;
+ else if (bits)
+ value = 0xeB;
+ if (INFO(value) > zerosLeft)
+ value = 0;
+ break;
+ }
+
+ return(value);
+
+}
+
+/*------------------------------------------------------------------------------
+
+ Function: DecodeResidualBlockCavlc
+
+ Functional description:
+ Function to decode one CAVLC coded block. This corresponds to
+ syntax elements residual_block_cavlc() in the standard.
+
+ Inputs:
+ pStrmData pointer to stream data structure
+ nc nC value
+ maxNumCoeff maximum number of residual coefficients
+
+ Outputs:
+ coeffLevel stores decoded coefficient levels
+
+ Returns:
+ numCoeffs on bits [4,11] if successful
+ coeffMap on bits [16,31] if successful, this is bit map
+ where each bit indicates if the corresponding
+ coefficient was zero (0) or non-zero (1)
+ HANTRO_NOK end of stream or error in stream
+
+------------------------------------------------------------------------------*/
+
+u32 h264bsdDecodeResidualBlockCavlc(
+ strmData_t *pStrmData,
+ i32 *coeffLevel,
+ i32 nc,
+ u32 maxNumCoeff)
+{
+
+/* Variables */
+
+ u32 i, tmp, totalCoeff, trailingOnes, suffixLength, levelPrefix;
+ u32 levelSuffix, zerosLeft, bit;
+ i32 level[16];
+ u32 run[16];
+ /* stream "cache" */
+ u32 bufferValue;
+ u32 bufferBits;
+
+/* Code */
+
+ ASSERT(pStrmData);
+ ASSERT(coeffLevel);
+ ASSERT(nc > -2);
+ ASSERT(maxNumCoeff == 4 || maxNumCoeff == 15 || maxNumCoeff == 16);
+ ASSERT(VLC_NOT_FOUND != END_OF_STREAM);
+
+ /* assume that coeffLevel array has been "cleaned" by caller */
+
+ BUFFER_INIT(bufferValue, bufferBits);
+
+ /*lint -e774 disable lint warning on always false comparison */
+ BUFFER_SHOW(bufferValue, bufferBits, bit, 16);
+ /*lint +e774 */
+ tmp = DecodeCoeffToken(bit, (u32)nc);
+ if (!tmp)
+ return(HANTRO_NOK);
+ BUFFER_FLUSH(bufferValue, bufferBits, LENGTH_TC(tmp));
+
+ totalCoeff = TOTAL_COEFF(tmp);
+ if (totalCoeff > maxNumCoeff)
+ return(HANTRO_NOK);
+ trailingOnes = TRAILING_ONES(tmp);
+
+ if (totalCoeff != 0)
+ {
+ i = 0;
+ /* nonzero coefficients: +/- 1 */
+ if (trailingOnes)
+ {
+ BUFFER_GET(bufferValue, bufferBits, bit, trailingOnes);
+ tmp = 1 << (trailingOnes - 1);
+ for (; tmp; i++)
+ {
+ level[i] = bit & tmp ? -1 : 1;
+ tmp >>= 1;
+ }
+ }
+
+ /* other levels */
+ if (totalCoeff > 10 && trailingOnes < 3)
+ suffixLength = 1;
+ else
+ suffixLength = 0;
+
+ for (; i < totalCoeff; i++)
+ {
+ BUFFER_SHOW(bufferValue, bufferBits, bit, 16);
+ levelPrefix = DecodeLevelPrefix(bit);
+ if (levelPrefix == VLC_NOT_FOUND)
+ return(HANTRO_NOK);
+ BUFFER_FLUSH(bufferValue, bufferBits, levelPrefix+1);
+
+ if (levelPrefix < 14)
+ tmp = suffixLength;
+ else if (levelPrefix == 14)
+ {
+ tmp = suffixLength ? suffixLength : 4;
+ }
+ else
+ {
+ /* setting suffixLength to 1 here corresponds to adding 15
+ * to levelCode value if levelPrefix == 15 and
+ * suffixLength == 0 */
+ if (!suffixLength)
+ suffixLength = 1;
+ tmp = 12;
+ }
+
+ if (suffixLength)
+ levelPrefix <<= suffixLength;
+
+ if (tmp)
+ {
+ BUFFER_GET(bufferValue, bufferBits, levelSuffix, tmp);
+ levelPrefix += levelSuffix;
+ }
+
+ tmp = levelPrefix;
+
+ if (i == trailingOnes && trailingOnes < 3)
+ tmp += 2;
+
+ level[i] = (tmp+2)>>1;
+
+ if (suffixLength == 0)
+ suffixLength = 1;
+
+ if ((level[i] > (3 << (suffixLength - 1))) && suffixLength < 6)
+ suffixLength++;
+
+ if (tmp & 0x1)
+ level[i] = -level[i];
+ }
+
+ /* zero runs */
+ if (totalCoeff < maxNumCoeff)
+ {
+ BUFFER_SHOW(bufferValue, bufferBits, bit,9);
+ zerosLeft = DecodeTotalZeros(bit, totalCoeff,
+ (u32)(maxNumCoeff == 4));
+ if (!zerosLeft)
+ return(HANTRO_NOK);
+ BUFFER_FLUSH(bufferValue, bufferBits, LENGTH(zerosLeft));
+ zerosLeft = INFO(zerosLeft);
+ }
+ else
+ zerosLeft = 0;
+
+ for (i = 0; i < totalCoeff - 1; i++)
+ {
+ if (zerosLeft > 0)
+ {
+ BUFFER_SHOW(bufferValue, bufferBits, bit,11);
+ tmp = DecodeRunBefore(bit, zerosLeft);
+ if (!tmp)
+ return(HANTRO_NOK);
+ BUFFER_FLUSH(bufferValue, bufferBits, LENGTH(tmp));
+ run[i] = INFO(tmp);
+ zerosLeft -= run[i]++;
+ }
+ else
+ {
+ run[i] = 1;
+ }
+ }
+
+ /* combining level and run, levelSuffix variable used to hold coeffMap,
+ * i.e. bit map indicating which coefficients had non-zero value. */
+
+ /*lint -esym(771,level,run) level and run are always initialized */
+ tmp = zerosLeft;
+ coeffLevel[tmp] = level[totalCoeff-1];
+ levelSuffix = 1 << tmp;
+ for (i = totalCoeff-1; i--;)
+ {
+ tmp += run[i];
+ levelSuffix |= 1 << tmp;
+ coeffLevel[tmp] = level[i];
+ }
+
+ }
+ else
+ levelSuffix = 0;
+
+ if (h264bsdFlushBits(pStrmData, 32-bufferBits) != HANTRO_OK)
+ return(HANTRO_NOK);
+
+ return((totalCoeff << 4) | (levelSuffix << 16));
+}
+
generated by cgit v1.1 at 2024-05-31 12:33:44 +0000