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Move the scale factor and word length indexes to the stack.

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Originally committed as revision 19951 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Benjamin Larsson 2009-09-21 20:49:08 +00:00
parent 523ef55119
commit b6a237025d
1 changed files with 7 additions and 7 deletions
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14
libavcodec/atrac1.c
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@ -57,8 +57,6 @@
typedef struct {
int log2_block_count[AT1_QMF_BANDS]; ///< log2 number of blocks in a band
int num_bfus; ///< number of Block Floating Units
int idwls[AT1_MAX_BFU]; ///< the word length indexes for each BFU
int idsfs[AT1_MAX_BFU]; ///< the scalefactor indexes for each BFU
float* spectrum[2];
DECLARE_ALIGNED_16(float, spec1[AT1_SU_SAMPLES]); ///< mdct buffer
DECLARE_ALIGNED_16(float, spec2[AT1_SU_SAMPLES]); ///< mdct buffer
@ -197,6 +195,8 @@ static int at1_unpack_dequant(GetBitContext* gb, AT1SUCtx* su,
float spec[AT1_SU_SAMPLES])
{
int bits_used, band_num, bfu_num, i;
uint8_t idwls[AT1_MAX_BFU]; ///< the word length indexes for each BFU
uint8_t idsfs[AT1_MAX_BFU]; ///< the scalefactor indexes for each BFU
/* parse the info byte (2nd byte) telling how much BFUs were coded */
su->num_bfus = bfu_amount_tab1[get_bits(gb, 3)];
@ -210,15 +210,15 @@ static int at1_unpack_dequant(GetBitContext* gb, AT1SUCtx* su,
/* get word length index (idwl) for each BFU */
for (i = 0; i < su->num_bfus; i++)
su->idwls[i] = get_bits(gb, 4);
idwls[i] = get_bits(gb, 4);
/* get scalefactor index (idsf) for each BFU */
for (i = 0; i < su->num_bfus; i++)
su->idsfs[i] = get_bits(gb, 6);
idsfs[i] = get_bits(gb, 6);
/* zero idwl/idsf for empty BFUs */
for (i = su->num_bfus; i < AT1_MAX_BFU; i++)
su->idwls[i] = su->idsfs[i] = 0;
idwls[i] = idsfs[i] = 0;
/* read in the spectral data and reconstruct MDCT spectrum of this channel */
for (band_num = 0; band_num < AT1_QMF_BANDS; band_num++) {
@ -226,8 +226,8 @@ static int at1_unpack_dequant(GetBitContext* gb, AT1SUCtx* su,
int pos;
int num_specs = specs_per_bfu[bfu_num];
int word_len = !!su->idwls[bfu_num] + su->idwls[bfu_num];
float scale_factor = sf_table[su->idsfs[bfu_num]];
int word_len = !!idwls[bfu_num] + idwls[bfu_num];
float scale_factor = sf_table[idsfs[bfu_num]];
bits_used += word_len * num_specs; /* add number of bits consumed by current BFU */
/* check for bitstream overflow */