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authorMichael Niedermayer <michaelni@gmx.at>2012-10-13 15:35:05 +0200
committerMichael Niedermayer <michaelni@gmx.at>2012-10-13 15:35:05 +0200
commitc55bebe2cc7bd444f83a678babc1b287aa7a3da1 (patch)
tree3970c69732f54db67ee63ce33c2e456e19ce079c /libavcodec/rangecoder.c
parent85fe70b64c3d0c46ba5a8c7b501283e3b97e24e4 (diff)
parent90558e848a29ef1e85ecb1832ad9a26eebe958e0 (diff)
downloadffmpeg-c55bebe2cc7bd444f83a678babc1b287aa7a3da1.tar.gz
Merge commit '90558e848a29ef1e85ecb1832ad9a26eebe958e0'
* commit '90558e848a29ef1e85ecb1832ad9a26eebe958e0': rangecoder: K&R formatting cosmetics Conflicts: libavcodec/rangecoder.c libavcodec/rangecoder.h Merged-by: Michael Niedermayer <michaelni@gmx.at>
Diffstat (limited to 'libavcodec/rangecoder.c')
-rw-r--r--libavcodec/rangecoder.c110
1 files changed, 56 insertions, 54 deletions
diff --git a/libavcodec/rangecoder.c b/libavcodec/rangecoder.c
index 509d968592..f0084a9505 100644
--- a/libavcodec/rangecoder.c
+++ b/libavcodec/rangecoder.c
@@ -38,70 +38,72 @@
#include "rangecoder.h"
#include "bytestream.h"
-
-void ff_init_range_encoder(RangeCoder *c, uint8_t *buf, int buf_size){
- c->bytestream_start=
- c->bytestream= buf;
- c->bytestream_end= buf + buf_size;
-
- c->low= 0;
- c->range= 0xFF00;
- c->outstanding_count= 0;
- c->outstanding_byte= -1;
+void ff_init_range_encoder(RangeCoder *c, uint8_t *buf, int buf_size)
+{
+ c->bytestream_start =
+ c->bytestream = buf;
+ c->bytestream_end = buf + buf_size;
+ c->low = 0;
+ c->range = 0xFF00;
+ c->outstanding_count = 0;
+ c->outstanding_byte = -1;
}
-void ff_init_range_decoder(RangeCoder *c, const uint8_t *buf, int buf_size){
+void ff_init_range_decoder(RangeCoder *c, const uint8_t *buf, int buf_size)
+{
/* cast to avoid compiler warning */
- ff_init_range_encoder(c, (uint8_t *) buf, buf_size);
+ ff_init_range_encoder(c, (uint8_t *)buf, buf_size);
c->low = bytestream_get_be16((const uint8_t **)&c->bytestream);
}
-void ff_build_rac_states(RangeCoder *c, int factor, int max_p){
- const int64_t one= 1LL<<32;
+void ff_build_rac_states(RangeCoder *c, int factor, int max_p)
+{
+ const int64_t one = 1LL << 32;
int64_t p;
int last_p8, p8, i;
memset(c->zero_state, 0, sizeof(c->zero_state));
- memset(c-> one_state, 0, sizeof(c-> one_state));
-
- last_p8= 0;
- p= one/2;
- for(i=0; i<128; i++){
- p8= (256*p + one/2) >> 32; //FIXME try without the one
- if(p8 <= last_p8) p8= last_p8+1;
- if(last_p8 && last_p8<256 && p8<=max_p)
- c->one_state[last_p8]= p8;
-
- p+= ((one-p)*factor + one/2) >> 32;
- last_p8= p8;
+ memset(c->one_state, 0, sizeof(c->one_state));
+
+ last_p8 = 0;
+ p = one / 2;
+ for (i = 0; i < 128; i++) {
+ p8 = (256 * p + one / 2) >> 32; // FIXME: try without the one
+ if (p8 <= last_p8)
+ p8 = last_p8 + 1;
+ if (last_p8 && last_p8 < 256 && p8 <= max_p)
+ c->one_state[last_p8] = p8;
+
+ p += ((one - p) * factor + one / 2) >> 32;
+ last_p8 = p8;
}
- for(i=256-max_p; i<=max_p; i++){
- if(c->one_state[i])
+ for (i = 256 - max_p; i <= max_p; i++) {
+ if (c->one_state[i])
continue;
- p= (i*one + 128) >> 8;
- p+= ((one-p)*factor + one/2) >> 32;
- p8= (256*p + one/2) >> 32; //FIXME try without the one
- if(p8 <= i) p8= i+1;
- if(p8 > max_p) p8= max_p;
- c->one_state[ i]= p8;
+ p = (i * one + 128) >> 8;
+ p += ((one - p) * factor + one / 2) >> 32;
+ p8 = (256 * p + one / 2) >> 32; // FIXME: try without the one
+ if (p8 <= i)
+ p8 = i + 1;
+ if (p8 > max_p)
+ p8 = max_p;
+ c->one_state[i] = p8;
}
- for(i=1; i<255; i++)
- c->zero_state[i]= 256-c->one_state[256-i];
+ for (i = 1; i < 255; i++)
+ c->zero_state[i] = 256 - c->one_state[256 - i];
}
-/**
- *
- * @return the number of bytes written
- */
-int ff_rac_terminate(RangeCoder *c){
- c->range=0xFF;
- c->low +=0xFF;
+/* Return the number of bytes written. */
+int ff_rac_terminate(RangeCoder *c)
+{
+ c->range = 0xFF;
+ c->low += 0xFF;
renorm_encoder(c);
- c->range=0xFF;
+ c->range = 0xFF;
renorm_encoder(c);
av_assert1(c->low == 0);
@@ -115,10 +117,11 @@ int ff_rac_terminate(RangeCoder *c){
#include "libavutil/lfg.h"
-int main(void){
+int main(void)
+{
RangeCoder c;
- uint8_t b[9*SIZE];
- uint8_t r[9*SIZE];
+ uint8_t b[9 * SIZE];
+ uint8_t r[9 * SIZE];
int i;
uint8_t state[10];
AVLFG prng;
@@ -126,17 +129,16 @@ int main(void){
av_lfg_init(&prng, 1);
ff_init_range_encoder(&c, b, SIZE);
- ff_build_rac_states(&c, 0.05*(1LL<<32), 128+64+32+16);
+ ff_build_rac_states(&c, 0.05 * (1LL << 32), 128 + 64 + 32 + 16);
memset(state, 128, sizeof(state));
- for(i=0; i<SIZE; i++){
+ for (i = 0; i < SIZE; i++)
r[i] = av_lfg_get(&prng) % 7;
- }
- for(i=0; i<SIZE; i++){
+ for (i = 0; i < SIZE; i++) {
START_TIMER
- put_rac(&c, state, r[i]&1);
+ put_rac(&c, state, r[i] & 1);
STOP_TIMER("put_rac")
}
@@ -146,9 +148,9 @@ STOP_TIMER("put_rac")
memset(state, 128, sizeof(state));
- for(i=0; i<SIZE; i++){
+ for (i = 0; i < SIZE; i++) {
START_TIMER
- if( (r[i]&1) != get_rac(&c, state) )
+ if ((r[i] & 1) != get_rac(&c, state))
av_log(NULL, AV_LOG_ERROR, "rac failure at %d\n", i);
STOP_TIMER("get_rac")
}