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mlp: Simplify adressing of state and coeffs arrays for both filters by making 

the arrays sequential.

Originally committed as revision 18841 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Ramiro Polla 2009-05-15 15:34:22 +00:00
parent 42e64bf874
commit 13bd2044d3
4 changed files with 17 additions and 12 deletions
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4
libavcodec/dsputil.h
View File

@ -476,8 +476,8 @@ typedef struct DSPContext {
void (*shrink[4])(uint8_t *dst, int dst_wrap, const uint8_t *src, int src_wrap, int width, int height);
/* mlp/truehd functions */
void (*mlp_filter_channel)(int32_t *firbuf, const int32_t *fircoeff, int firorder,
int32_t *iirbuf, const int32_t *iircoeff, int iirorder,
void (*mlp_filter_channel)(int32_t *state, const int32_t *coeff,
int firorder, int iirorder,
unsigned int filter_shift, int32_t mask, int blocksize,
int32_t *sample_buffer);

2
libavcodec/mlp.h
View File

@ -73,13 +73,13 @@ typedef struct {
uint8_t order; ///< number of taps in filter
uint8_t shift; ///< Right shift to apply to output of filter.
int32_t coeff[MAX_FIR_ORDER];
int32_t state[MAX_FIR_ORDER];
} FilterParams;
/** sample data coding information */
typedef struct {
FilterParams filter_params[NUM_FILTERS];
int32_t coeff[NUM_FILTERS][MAX_FIR_ORDER];
int16_t huff_offset; ///< Offset to apply to residual values.
int32_t sign_huff_offset; ///< sign/rounding-corrected version of huff_offset

15
libavcodec/mlpdec.c
View File

@ -495,6 +495,7 @@ static int read_filter_params(MLPDecodeContext *m, GetBitContext *gbp,
fp->order = order;
if (order > 0) {
int32_t *fcoeff = m->channel_params[channel].coeff[filter];
int coeff_bits, coeff_shift;
fp->shift = get_bits(gbp, 4);
@ -515,7 +516,7 @@ static int read_filter_params(MLPDecodeContext *m, GetBitContext *gbp,
}
for (i = 0; i < order; i++)
fp->coeff[i] = get_sbits(gbp, coeff_bits) << coeff_shift;
fcoeff[i] = get_sbits(gbp, coeff_bits) << coeff_shift;
if (get_bits1(gbp)) {
int state_bits, state_shift;
@ -718,10 +719,10 @@ static void filter_channel(MLPDecodeContext *m, unsigned int substr,
unsigned int channel)
{
SubStream *s = &m->substream[substr];
int32_t fir_state_buffer[MAX_BLOCKSIZE + MAX_FIR_ORDER];
int32_t iir_state_buffer[MAX_BLOCKSIZE + MAX_IIR_ORDER];
int32_t *firbuf = fir_state_buffer + MAX_BLOCKSIZE;
int32_t *iirbuf = iir_state_buffer + MAX_BLOCKSIZE;
const int32_t *fircoeff = m->channel_params[channel].coeff[FIR];
int32_t state_buffer[NUM_FILTERS][MAX_BLOCKSIZE + MAX_FIR_ORDER];
int32_t *firbuf = state_buffer[FIR] + MAX_BLOCKSIZE;
int32_t *iirbuf = state_buffer[IIR] + MAX_BLOCKSIZE;
FilterParams *fir = &m->channel_params[channel].filter_params[FIR];
FilterParams *iir = &m->channel_params[channel].filter_params[IIR];
unsigned int filter_shift = fir->shift;
@ -730,8 +731,8 @@ static void filter_channel(MLPDecodeContext *m, unsigned int substr,
memcpy(firbuf, fir->state, MAX_FIR_ORDER * sizeof(int32_t));
memcpy(iirbuf, iir->state, MAX_IIR_ORDER * sizeof(int32_t));
m->dsp.mlp_filter_channel(firbuf, fir->coeff, fir->order,
iirbuf, iir->coeff, iir->order,
m->dsp.mlp_filter_channel(firbuf, fircoeff,
fir->order, iir->order,
filter_shift, mask, s->blocksize,
&m->sample_buffer[s->blockpos][channel]);

8
libavcodec/mlpdsp.c
View File

@ -22,11 +22,15 @@
#include "libavcodec/mlp.h"
#include "dsputil.h"
static void ff_mlp_filter_channel(int32_t *firbuf, const int32_t *fircoeff, int firorder,
int32_t *iirbuf, const int32_t *iircoeff, int iirorder,
static void ff_mlp_filter_channel(int32_t *state, const int32_t *coeff,
int firorder, int iirorder,
unsigned int filter_shift, int32_t mask, int blocksize,
int32_t *sample_buffer)
{
int32_t *firbuf = state;
int32_t *iirbuf = state + MAX_BLOCKSIZE + MAX_FIR_ORDER;
const int32_t *fircoeff = coeff;
const int32_t *iircoeff = coeff + MAX_FIR_ORDER;
int i;
for (i = 0; i < blocksize; i++) {