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avcodec/vp3: spin off get_eob_run and get_coeff coeff functions 

these reoutines are shared by vp3 and vp4.
This commit is contained in:
Peter Ross 2019-06-08 10:55:51 +10:00
parent 442375fee7
commit a212c8da48
1 changed files with 26 additions and 13 deletions
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39
libavcodec/vp3.c
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@ -931,6 +931,30 @@ static int unpack_block_qpis(Vp3DecodeContext *s, GetBitContext *gb)
return 0;
}
static inline int get_eob_run(GetBitContext *gb, int token)
{
int v = eob_run_table[token].base;
if (eob_run_table[token].bits)
v += get_bits(gb, eob_run_table[token].bits);
return v;
}
static inline int get_coeff(GetBitContext *gb, int token, int16_t *coeff)
{
int bits_to_get, zero_run;
bits_to_get = coeff_get_bits[token];
if (bits_to_get)
bits_to_get = get_bits(gb, bits_to_get);
*coeff = coeff_tables[token][bits_to_get];
zero_run = zero_run_base[token];
if (zero_run_get_bits[token])
zero_run += get_bits(gb, zero_run_get_bits[token]);
return zero_run;
}
/*
* This function is called by unpack_dct_coeffs() to extract the VLCs from
* the bitstream. The VLCs encode tokens which are used to unpack DCT
@ -952,7 +976,6 @@ static int unpack_vlcs(Vp3DecodeContext *s, GetBitContext *gb,
int token;
int zero_run = 0;
int16_t coeff = 0;
int bits_to_get;
int blocks_ended;
int coeff_i = 0;
int num_coeffs = s->num_coded_frags[plane][coeff_index];
@ -988,10 +1011,7 @@ static int unpack_vlcs(Vp3DecodeContext *s, GetBitContext *gb,
token = get_vlc2(gb, vlc_table, 11, 3);
/* use the token to get a zero run, a coefficient, and an eob run */
if ((unsigned) token <= 6U) {
eob_run = eob_run_table[token].base;
if (eob_run_table[token].bits)
eob_run += get_bits(gb, eob_run_table[token].bits);
eob_run = get_eob_run(gb, token);
if (!eob_run)
eob_run = INT_MAX;
@ -1009,14 +1029,7 @@ static int unpack_vlcs(Vp3DecodeContext *s, GetBitContext *gb,
eob_run = 0;
}
} else if (token >= 0) {
bits_to_get = coeff_get_bits[token];
if (bits_to_get)
bits_to_get = get_bits(gb, bits_to_get);
coeff = coeff_tables[token][bits_to_get];
zero_run = zero_run_base[token];
if (zero_run_get_bits[token])
zero_run += get_bits(gb, zero_run_get_bits[token]);
zero_run = get_coeff(gb, token, &coeff);
if (zero_run) {
dct_tokens[j++] = TOKEN_ZERO_RUN(coeff, zero_run);