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lavc/lpc: Add min_shift parameter in LPC

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The min_shift parameter is needed by the MLP encoder

Signed-off-by: Jai Luthra <me@jailuthra.in>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Jai Luthra 2016-08-23 02:32:04 +05:30 committed by Michael Niedermayer
parent 88bcdf109a
commit 0c023d181e
5 changed files with 15 additions and 9 deletions
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4
libavcodec/alacenc.c
View File

@ -38,6 +38,7 @@
#define DEFAULT_MAX_PRED_ORDER 6
#define DEFAULT_MIN_PRED_ORDER 4
#define ALAC_MAX_LPC_PRECISION 9
#define ALAC_MIN_LPC_SHIFT 0
#define ALAC_MAX_LPC_SHIFT 9
#define ALAC_CHMODE_LEFT_RIGHT 0
@ -171,7 +172,8 @@ static void calc_predictor_params(AlacEncodeContext *s, int ch)
s->max_prediction_order,
ALAC_MAX_LPC_PRECISION, coefs, shift,
FF_LPC_TYPE_LEVINSON, 0,
ORDER_METHOD_EST, ALAC_MAX_LPC_SHIFT, 1);
ORDER_METHOD_EST, ALAC_MIN_LPC_SHIFT,
ALAC_MAX_LPC_SHIFT, 1);
s->lpc[ch].lpc_order = opt_order;
s->lpc[ch].lpc_quant = shift[opt_order-1];

3
libavcodec/flacenc.c
View File

@ -44,6 +44,7 @@
#define MAX_PARTITION_ORDER 8
#define MAX_PARTITIONS (1 << MAX_PARTITION_ORDER)
#define MAX_LPC_PRECISION 15
#define MIN_LPC_SHIFT 0
#define MAX_LPC_SHIFT 15
enum CodingMode {
@ -884,7 +885,7 @@ static int encode_residual_ch(FlacEncodeContext *s, int ch)
opt_order = ff_lpc_calc_coefs(&s->lpc_ctx, smp, n, min_order, max_order,
s->options.lpc_coeff_precision, coefs, shift, s->options.lpc_type,
s->options.lpc_passes, omethod,
MAX_LPC_SHIFT, 0);
MIN_LPC_SHIFT, MAX_LPC_SHIFT, 0);
if (omethod == ORDER_METHOD_2LEVEL ||
omethod == ORDER_METHOD_4LEVEL ||

13
libavcodec/lpc.c
View File

@ -93,7 +93,8 @@ static void lpc_compute_autocorr_c(const double *data, int len, int lag,
* Quantize LPC coefficients
*/
static void quantize_lpc_coefs(double *lpc_in, int order, int precision,
int32_t *lpc_out, int *shift, int max_shift, int zero_shift)
int32_t *lpc_out, int *shift, int min_shift,
int max_shift, int zero_shift)
{
int i;
double cmax, error;
@ -118,7 +119,7 @@ static void quantize_lpc_coefs(double *lpc_in, int order, int precision,
/* calculate level shift which scales max coeff to available bits */
sh = max_shift;
while((cmax * (1 << sh) > qmax) && (sh > 0)) {
while((cmax * (1 << sh) > qmax) && (sh > min_shift)) {
sh--;
}
@ -201,7 +202,7 @@ int ff_lpc_calc_coefs(LPCContext *s,
int max_order, int precision,
int32_t coefs[][MAX_LPC_ORDER], int *shift,
enum FFLPCType lpc_type, int lpc_passes,
int omethod, int max_shift, int zero_shift)
int omethod, int min_shift, int max_shift, int zero_shift)
{
double autoc[MAX_LPC_ORDER+1];
double ref[MAX_LPC_ORDER] = { 0 };
@ -284,10 +285,12 @@ int ff_lpc_calc_coefs(LPCContext *s,
if(omethod == ORDER_METHOD_EST) {
opt_order = estimate_best_order(ref, min_order, max_order);
i = opt_order-1;
quantize_lpc_coefs(lpc[i], i+1, precision, coefs[i], &shift[i], max_shift, zero_shift);
quantize_lpc_coefs(lpc[i], i+1, precision, coefs[i], &shift[i],
min_shift, max_shift, zero_shift);
} else {
for(i=min_order-1; i<max_order; i++) {
quantize_lpc_coefs(lpc[i], i+1, precision, coefs[i], &shift[i], max_shift, zero_shift);
quantize_lpc_coefs(lpc[i], i+1, precision, coefs[i], &shift[i],
min_shift, max_shift, zero_shift);
}
}

2
libavcodec/lpc.h
View File

@ -95,7 +95,7 @@ int ff_lpc_calc_coefs(LPCContext *s,
int max_order, int precision,
int32_t coefs[][MAX_LPC_ORDER], int *shift,
enum FFLPCType lpc_type, int lpc_passes,
int omethod, int max_shift, int zero_shift);
int omethod, int min_shift, int max_shift, int zero_shift);
int ff_lpc_calc_ref_coefs(LPCContext *s,
const int32_t *samples, int order, double *ref);

2
libavcodec/ra144enc.c
View File

@ -475,7 +475,7 @@ static int ra144_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
ff_lpc_calc_coefs(&ractx->lpc_ctx, lpc_data, NBLOCKS * BLOCKSIZE, LPC_ORDER,
LPC_ORDER, 16, lpc_coefs, shift, FF_LPC_TYPE_LEVINSON,
0, ORDER_METHOD_EST, 12, 0);
0, ORDER_METHOD_EST, 0, 12, 0);
for (i = 0; i < LPC_ORDER; i++)
block_coefs[NBLOCKS - 1][i] = -(lpc_coefs[LPC_ORDER - 1][i] <<
(12 - shift[LPC_ORDER - 1]));