avcodec/cabac: Move encoder related stuff to libavcodec/tests/cabac.c

(This is actually the second time the encoder stuff is removed;
the first was in 8b4119187b62d6932e07aded11d33d3b24e1b42f.)

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

1 files changed, 59 insertions, 34 deletions

diff --git a/libavcodec/tests/cabac.c b/libavcodec/tests/cabac.c
index affe4eb141..a8bd131c95 100644
--- a/libavcodec/tests/cabac.c
+++ b/libavcodec/tests/cabac.c
@@ -24,41 +24,51 @@
 
 #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];
     }
 
@@ -68,21 +78,22 @@ static void put_cabac(CABACContext *c, uint8_t * const state, int bit){
 /**
  * @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;
     }
 }
 
@@ -90,20 +101,21 @@ static void put_cabac_bypass(CABACContext *c, int bit){
  *
  * @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
     }
@@ -111,8 +123,21 @@ static int put_cabac_terminate(CABACContext *c, int bit){
     return (put_bits_count(&c->pb)+7)>>3;
 }
 
+/**
+ * @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;
@@ -120,7 +145,7 @@ int main(void){
     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;
@@ -139,24 +164,24 @@ int main(void){
     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;
     }