#include "libavutil/lfg.h"
#include "libavcodec/avcodec.h"
+#include "libavcodec/put_bits.h"
-static inline void put_cabac_bit(CABACContext *c, int b){
+typedef struct CABACTestContext {
+ CABACContext dec;
+ int outstanding_count;
+ PutBitContext pb;
+} CABACTestContext;
+
+static inline void put_cabac_bit(CABACTestContext *c, int b)
+{
put_bits(&c->pb, 1, b);
for(;c->outstanding_count; c->outstanding_count--){
put_bits(&c->pb, 1, 1-b);
}
}
-static inline void renorm_cabac_encoder(CABACContext *c){
- while(c->range < 0x100){
+static inline void renorm_cabac_encoder(CABACTestContext *c)
+{
+ while (c->dec.range < 0x100) {
//FIXME optimize
- if(c->low<0x100){
+ if (c->dec.low < 0x100) {
put_cabac_bit(c, 0);
- }else if(c->low<0x200){
+ } else if (c->dec.low < 0x200) {
c->outstanding_count++;
- c->low -= 0x100;
+ c->dec.low -= 0x100;
}else{
put_cabac_bit(c, 1);
- c->low -= 0x200;
+ c->dec.low -= 0x200;
}
- c->range+= c->range;
- c->low += c->low;
+ c->dec.range += c->dec.range;
+ c->dec.low += c->dec.low;
}
}
-static void put_cabac(CABACContext *c, uint8_t * const state, int bit){
- int RangeLPS= ff_h264_lps_range[2*(c->range&0xC0) + *state];
+static void put_cabac(CABACTestContext *c, uint8_t * const state, int bit)
+{
+ int RangeLPS = ff_h264_lps_range[2 * (c->dec.range & 0xC0) + *state];
if(bit == ((*state)&1)){
- c->range -= RangeLPS;
+ c->dec.range -= RangeLPS;
*state = ff_h264_mlps_state[128 + *state];
}else{
- c->low += c->range - RangeLPS;
- c->range = RangeLPS;
+ c->dec.low += c->dec.range - RangeLPS;
+ c->dec.range = RangeLPS;
*state= ff_h264_mlps_state[127 - *state];
}
/**
* @param bit 0 -> write zero bit, !=0 write one bit
*/
-static void put_cabac_bypass(CABACContext *c, int bit){
- c->low += c->low;
+static void put_cabac_bypass(CABACTestContext *c, int bit)
+{
+ c->dec.low += c->dec.low;
if(bit){
- c->low += c->range;
+ c->dec.low += c->dec.range;
}
//FIXME optimize
- if(c->low<0x200){
+ if (c->dec.low < 0x200) {
put_cabac_bit(c, 0);
- }else if(c->low<0x400){
+ } else if (c->dec.low < 0x400) {
c->outstanding_count++;
- c->low -= 0x200;
+ c->dec.low -= 0x200;
}else{
put_cabac_bit(c, 1);
- c->low -= 0x400;
+ c->dec.low -= 0x400;
}
}
*
* @return the number of bytes written
*/
-static int put_cabac_terminate(CABACContext *c, int bit){
- c->range -= 2;
+static int put_cabac_terminate(CABACTestContext *c, int bit)
+{
+ c->dec.range -= 2;
if(!bit){
renorm_cabac_encoder(c);
}else{
- c->low += c->range;
- c->range= 2;
+ c->dec.low += c->dec.range;
+ c->dec.range = 2;
renorm_cabac_encoder(c);
- av_assert0(c->low <= 0x1FF);
- put_cabac_bit(c, c->low>>9);
- put_bits(&c->pb, 2, ((c->low>>7)&3)|1);
+ av_assert0(c->dec.low <= 0x1FF);
+ put_cabac_bit(c, c->dec.low >> 9);
+ put_bits(&c->pb, 2, ((c->dec.low >> 7) & 3) | 1);
flush_put_bits(&c->pb); //FIXME FIXME FIXME XXX wrong
}
- return (put_bits_count(&c->pb)+7)>>3;
+ return put_bytes_count(&c->pb, 1);
+}
+
+/**
+ * @param buf_size size of buf in bits
+ */
+static void init_cabac_encoder(CABACTestContext *c, uint8_t *buf, int buf_size)
+{
+ init_put_bits(&c->pb, buf, buf_size);
+
+ c->dec.low = 0;
+ c->dec.range = 0x1FE;
+ c->outstanding_count = 0;
+ c->pb.bit_left++; //avoids firstBitFlag
}
int main(void){
- CABACContext c;
+ CABACTestContext c;
uint8_t b[9*SIZE];
uint8_t r[9*SIZE];
int i, ret = 0;
AVLFG prng;
av_lfg_init(&prng, 1);
- ff_init_cabac_encoder(&c, b, SIZE);
+ init_cabac_encoder(&c, b, SIZE);
for(i=0; i<SIZE; i++){
if(2*i<SIZE) r[i] = av_lfg_get(&prng) % 7;
b[i++] = av_lfg_get(&prng);
b[i ] = av_lfg_get(&prng);
- ff_init_cabac_decoder(&c, b, SIZE);
+ ff_init_cabac_decoder(&c.dec, b, SIZE);
memset(state, 0, sizeof(state));
for(i=0; i<SIZE; i++){
- if( (r[i]&1) != get_cabac_bypass(&c) ) {
+ if ((r[i] & 1) != get_cabac_bypass(&c.dec)) {
av_log(NULL, AV_LOG_ERROR, "CABAC bypass failure at %d\n", i);
ret = 1;
}
}
for(i=0; i<SIZE; i++){
- if( (r[i]&1) != get_cabac_noinline(&c, state) ) {
+ if ((r[i] & 1) != get_cabac_noinline(&c.dec, state)) {
av_log(NULL, AV_LOG_ERROR, "CABAC failure at %d\n", i);
ret = 1;
}
}
- if(!get_cabac_terminate(&c)) {
+ if (!get_cabac_terminate(&c.dec)) {
av_log(NULL, AV_LOG_ERROR, "where's the Terminator?\n");
ret = 1;
}