/**
* decodes a residual block.
* @param n block index
* @param scantable scantable
* @param max_coeff number of coefficients in the block
* @return <0 if an error occurred
*/
public static int decode_residual(H264Context h, GetBitContext gb, short[] block_base, int block_offset
, int n, byte[] scantable_base, int scantable_offset, long[] qmul_base, int qmul_offset, int max_coeff)
{
// , int n, uint8_t *scantable, uint32_t *qmul, int max_coeff){
//MpegEncContext s = h.s;
int[/*17*/] coeff_token_table_index = { 0, 0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3 };
int[] level = new int[16];
int zeros_left, coeff_token, total_coeff, i, trailing_ones, run_before;
//FIXME put trailing_onex into the context
if (n >= H264Context.CHROMA_DC_BLOCK_INDEX)
{
coeff_token = gb.get_vlc2(
chroma_dc_coeff_token_vlc.table_base, chroma_dc_coeff_token_vlc.table_offset,
H264Context.CHROMA_DC_COEFF_TOKEN_VLC_BITS, 1, "coeff_token_CROMA_DC");
total_coeff = coeff_token >> 2;
//Console.WriteLine("get_vlc2(CHROMA_DC_COEFF_TOKEN) => total_coeff = " + total_coeff );
}
else
{
if (n == H264Context.LUMA_DC_BLOCK_INDEX)
{
total_coeff = pred_non_zero_count(h, 0);
//Console.WriteLine("Prediected Non-Zero count = "+total_coeff);
coeff_token = gb.get_vlc2(
coeff_token_vlc[coeff_token_table_index[total_coeff]].table_base,
coeff_token_vlc[coeff_token_table_index[total_coeff]].table_offset,
H264Context.COEFF_TOKEN_VLC_BITS, 2, "coeff_token_LUMA_DC");
total_coeff = coeff_token >> 2;
//Console.WriteLine("get_vlc2(LUMA_DC_COEFF_TOKEN) => total_coeff = " + total_coeff );
}
else
{
total_coeff = pred_non_zero_count(h, n);
// DebugTool.printDebugString("predicted non_zero_count("+n+") = "+total_coeff+"\n");
coeff_token = gb.get_vlc2(
coeff_token_vlc[coeff_token_table_index[total_coeff]].table_base,
coeff_token_vlc[coeff_token_table_index[total_coeff]].table_offset,
H264Context.COEFF_TOKEN_VLC_BITS, 2, "coeff_token_LUMA(2)_DC");
total_coeff = coeff_token >> 2;
// DebugTool.printDebugString("predicted non_zero_count-2 = "+total_coeff+"\n");
}
}
h.non_zero_count_cache[H264Context.scan8[n]] = total_coeff;
//FIXME set last_non_zero?
if (total_coeff == 0)
return 0;
if (total_coeff > /*(unsigned)*/max_coeff)
{
// av_log(h.s.avctx, AV_LOG_ERROR, "corrupted macroblock %d %d (total_coeff=%d)\n", s.mb_x, s.mb_y, total_coeff);
// DebugTool.printDebugString(" -------- Error type 1.0\n");
return -1;
}
trailing_ones = coeff_token & 3;
// tprintf(h.s.avctx, "trailing:%d, total:%d\n", trailing_ones, total_coeff);
//assert(total_coeff<=16);
// DebugTool.printDebugString(" - trailing_ones = "+trailing_ones+"\n");
i = (int)gb.show_bits(3);
gb.skip_bits(trailing_ones);
level[0] = 1 - ((i & 4) >> 1);
level[1] = 1 - ((i & 2));
level[2] = 1 - ((i & 1) << 1);
// DebugTool.printDebugString(" - i = "+i+"\n");
if (trailing_ones < total_coeff)
{
int mask, prefix;
int suffix_length = ((total_coeff > 10) ? 1 : 0) & ((trailing_ones < 3) ? 1 : 0);
int bitsi = (int)gb.show_bits(LEVEL_TAB_BITS);
int level_code = cavlc_level_tab[suffix_length][bitsi][0];
// DebugTool.printDebugString(" - bitsi = "+bitsi+", level_code = "+level_code+", skip_bit = "+cavlc_level_tab[suffix_length][bitsi][1]+"\n");
gb.skip_bits(cavlc_level_tab[suffix_length][bitsi][1]);
if (level_code >= 100)
{
prefix = level_code - 100;
if (prefix == LEVEL_TAB_BITS)
prefix += get_level_prefix(gb);
// DebugTool.printDebugString(" - prefix = "+prefix+"\n");
//first coefficient has suffix_length equal to 0 or 1
if (prefix < 14)
{ //FIXME try to build a large unified VLC table for all this
if (suffix_length != 0)
level_code = (int)((prefix << 1) + gb.get_bits1("level_code")); //part
else
level_code = prefix; //part
}
else if (prefix == 14)
{
if (suffix_length != 0)
level_code = (int)((prefix << 1) + gb.get_bits1("level_code")); //part
else
level_code = (int)(prefix + gb.get_bits(4, "level_code")); //part
}
else
{
// Nok: Prevent bug?? in ffmpeg that the decoder may overflow?
level_code = 30 + (int)(gb.get_bits(prefix - 3, "level_code")); //part
if (prefix >= 16)
{
if (prefix > 25 + 3)
{
// DebugTool.printDebugString(" -------- Error type 1.1\n");
//av_log(h.s.avctx, AV_LOG_ERROR, "Invalid level prefix\n");
return -1;
}
level_code += (1 << (prefix - 3)) - 4096;
}
}
if (trailing_ones < 3) level_code += 2;
// DebugTool.printDebugString(" - level_code(1) = "+level_code+"\n");
suffix_length = 2;
mask = -(level_code & 1);
level[trailing_ones] = (((2 + level_code) >> 1) ^ mask) - mask;
}
else
{
level_code += ((level_code >> 31) | 1) & -((trailing_ones < 3) ? 1 : 0);
// DebugTool.printDebugString(" - level_code(2) = "+level_code+"\n");
// Fix: for difference between JAVA and C, we need to convert signed to unsigned when we compare
// signed and unsigned number because, in C, such comparing will be done in common part.
// In which, common part in C in unsigned, while java is signed. -= Nok =-
suffix_length = 1 + (((0xffffffffL & (level_code + 3)) > 6) ? 1 : 0);
level[trailing_ones] = level_code;
}
// DebugTool.printDebugString(" - suffix_length(1) = "+suffix_length+"\n");
//remaining coefficients have suffix_length > 0
for (i = trailing_ones + 1; i < total_coeff; i++)
{
int[/*7*/] suffix_limit = { 0, 3, 6, 12, 24, 48, int.MaxValue };
bitsi = (int)gb.show_bits(LEVEL_TAB_BITS);
level_code = cavlc_level_tab[suffix_length][bitsi][0];
// DebugTool.printDebugString(" - cavlc_level_tab["+suffix_length+"]["+bitsi+"][0] = "+level_code+"\n");
gb.skip_bits(cavlc_level_tab[suffix_length][bitsi][1]);
if (level_code >= 100)
{
prefix = level_code - 100;
if (prefix == LEVEL_TAB_BITS)
{
prefix += get_level_prefix(gb);
}
if (prefix < 15)
{
level_code = (int)((prefix << suffix_length) + gb.get_bits(suffix_length, "level_code"));
}
else
{
level_code = (int)((15 << suffix_length) + gb.get_bits(prefix - 3, "level_code"));
if (prefix >= 16)
level_code += (1 << (prefix - 3)) - 4096;
}
mask = -(level_code & 1);
level_code = (((2 + level_code) >> 1) ^ mask) - mask;
}
level[i] = level_code;
// DebugTool.printDebugString(" - prefix(6) = "+level_code+"\n");
// Fix: for difference between JAVA and C, we need to convert signed to unsigned when we compare
// signed and unsigned number because, in C, such comparing will be done in common part.
// In which, common part in C in unsigned, while java is signed. -= Nok =-
suffix_length += (((0xffffffffL & (suffix_limit[suffix_length] + level_code)) > (2L * suffix_limit[suffix_length])) ? 1 : 0);
}
// DebugTool.printDebugString(" - suffix_length(2) = "+suffix_length+"\n");
}
if (total_coeff == max_coeff)
zeros_left = 0;
else
{
if (n >= H264Context.CHROMA_DC_BLOCK_INDEX)
{
zeros_left = gb.get_vlc2(chroma_dc_total_zeros_vlc[total_coeff - 1].table_base,
chroma_dc_total_zeros_vlc[total_coeff - 1].table_offset,
H264Context.CHROMA_DC_TOTAL_ZEROS_VLC_BITS, 1, "coeff_token_CROMA_DC_TOTAL_ZERO");
// DebugTool.printDebugString("get_vlc2(CHROMA_DC_ZERO_LEFT) => zeros_left = " + zeros_left +"\n");
}
else
{
zeros_left = gb.get_vlc2(total_zeros_vlc[total_coeff - 1].table_base,
total_zeros_vlc[total_coeff - 1].table_offset,
H264Context.TOTAL_ZEROS_VLC_BITS, 1, "coeff_token_TOTAL_ZEROS");
// DebugTool.printDebugString("get_vlc2(LUMA_DC_ZERO_LEFT) => zeros_left = " + zeros_left +"\n");
} // if
}
/*
// DebugTool.printDebugString("scantable_offset(before) = {"
+scantable_base[scantable_offset+0]+","
+scantable_base[scantable_offset+1]+","
+scantable_base[scantable_offset+2]+","
+scantable_base[scantable_offset+3]+","
+scantable_base[scantable_offset+4]
+"}\n");
*/
scantable_offset += zeros_left + total_coeff - 1;
/*
// DebugTool.printDebugString("scantable_offset(after) = {"
+scantable_base[scantable_offset+0]+","
+scantable_base[scantable_offset+1]+","
+scantable_base[scantable_offset+2]+","
+scantable_base[scantable_offset+3]+","
+scantable_base[scantable_offset+4]
+"}\n");
*/
//!!????????????????????????????????? Magic about array resizing??
if (scantable_offset < 0)
{
byte[] new_scantable_base = new byte[scantable_base.Length + (-scantable_offset)];
Array.Copy(scantable_base, 0, new_scantable_base, -scantable_offset, scantable_base.Length);
scantable_base = new_scantable_base;
scantable_offset = 0;
}
if (n >= H264Context.LUMA_DC_BLOCK_INDEX)
{
// DebugTool.printDebugString("****RESE-CASE 1\n");
block_base[block_offset + scantable_base[scantable_offset]] = (short)level[0];
for (i = 1; i < total_coeff && zeros_left > 0; i++)
{
if (zeros_left < 7)
{
//????????????????????????????????????????/
// run_before= gb.get_vlc2((run_vlc-1)[zeros_left].table, H264Context.RUN_VLC_BITS, 1);
run_before = gb.get_vlc2(run_vlc[zeros_left - 1].table_base, run_vlc[zeros_left - 1].table_offset, H264Context.RUN_VLC_BITS, 1, "RUN_VLC");
//Console.WriteLine("get_vlc2(LUMA_RUN_VLC) => run_before = " + run_before );
}
else
{
run_before = gb.get_vlc2(run7_vlc.table_base, run7_vlc.table_offset, H264Context.RUN7_VLC_BITS, 2, "RUN7_VLC");
//Console.WriteLine("get_vlc2(LUMA_RUN_VLC7) => run_before = " + run_before );
} // if
////Console.WriteLine("run_before = "+run_before);
zeros_left -= run_before;
scantable_offset -= 1 + run_before;
block_base[block_offset + scantable_base[scantable_offset]] = (short)level[i];
}
for (; i < total_coeff; i++)
{
scantable_offset--;
block_base[block_offset + scantable_base[scantable_offset]] = (short)level[i];
}
}
else
{
// DebugTool.printDebugString("****RESE-CASE 2\n");
block_base[block_offset + scantable_base[scantable_offset]] = (short)((level[0] * qmul_base[qmul_offset + scantable_base[scantable_offset]] + 32) >> 6);
for (i = 1; i < total_coeff && zeros_left > 0; i++)
{
if (zeros_left < 7)
{
run_before = gb.get_vlc2(run_vlc[zeros_left - 1].table_base, run_vlc[zeros_left - 1].table_offset, H264Context.RUN_VLC_BITS, 1, "RUN_VLC");
//Console.WriteLine("get_vlc2(CHROMA_RUN_VLC) => run_before = " + run_before );
}
else
{
run_before = gb.get_vlc2(run7_vlc.table_base, run7_vlc.table_offset, H264Context.RUN7_VLC_BITS, 2, "RUN7_VLC");
//Console.WriteLine("get_vlc2(CHROMA_RUN_VLC7) => run_before = " + run_before );
} // if
////Console.WriteLine("run_before = "+run_before);
zeros_left -= run_before;
scantable_offset -= (1 + run_before);
block_base[block_offset + scantable_base[scantable_offset]] = (short)((level[i] * qmul_base[qmul_offset + scantable_base[scantable_offset]] + 32) >> 6);
}
for (; i < total_coeff; i++)
{
scantable_offset--;
block_base[block_offset + scantable_base[scantable_offset]] = (short)((level[i] * qmul_base[qmul_offset + scantable_base[scantable_offset]] + 32) >> 6);
}
}
if (zeros_left < 0)
{
//av_log(h.s.avctx, AV_LOG_ERROR, "negative number of zero coeffs at %d %d\n", s.mb_x, s.mb_y);
// DebugTool.printDebugString(" -------- Error type 1.2\n");
return -1;
}
return 0;
}
