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log prediction order search method

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Originally committed as revision 5763 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer
2006-07-16 15:46:45 +00:00
parent 26053bdcc8
commit dbb45a3bb7
1 changed files with 24 additions and 1 deletions
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25
libavcodec/flacenc.c
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@@ -43,6 +43,7 @@
#define ORDER_METHOD_4LEVEL 2
#define ORDER_METHOD_8LEVEL 3
#define ORDER_METHOD_SEARCH 4
#define ORDER_METHOD_LOG 5
#define FLAC_STREAMINFO_SIZE 34
@@ -291,7 +292,7 @@ static int flac_encode_init(AVCodecContext *avctx)
s->options.min_prediction_order, s->options.max_prediction_order);
if(avctx->prediction_order_method >= 0) {
if(avctx->prediction_order_method > ORDER_METHOD_SEARCH) {
if(avctx->prediction_order_method > ORDER_METHOD_LOG) {
av_log(avctx, AV_LOG_ERROR, "invalid prediction order method: %d\n",
avctx->prediction_order_method);
return -1;
@@ -309,6 +310,8 @@ static int flac_encode_init(AVCodecContext *avctx)
"8-level"); break;
case ORDER_METHOD_SEARCH: av_log(avctx, AV_LOG_DEBUG, " order method: %s\n",
"full search"); break;
case ORDER_METHOD_LOG: av_log(avctx, AV_LOG_DEBUG, " order method: %s\n",
"log search"); break;
}
if(avctx->min_partition_order >= 0) {
@@ -951,6 +954,26 @@ static int encode_residual(FlacEncodeContext *ctx, int ch)
}
}
opt_order++;
} else if(omethod == ORDER_METHOD_LOG) {
uint32_t bits[MAX_LPC_ORDER];
int step;
opt_order= min_order - 1 + (max_order-min_order)/3;
memset(bits, -1, sizeof(bits));
for(step=16 ;step; step>>=1){
int last= opt_order;
for(i=last-step; i<=last+step; i+= step){
if(i<min_order-1 || i>=max_order || bits[i] < UINT32_MAX)
continue;
encode_residual_lpc(res, smp, n, i+1, coefs[i], shift[i]);
bits[i] = calc_rice_params_lpc(&sub->rc, min_porder, max_porder,
res, n, i+1, sub->obits, precision);
if(bits[i] < bits[opt_order])
opt_order= i;
}
}
opt_order++;
}
sub->order = opt_order;