Use get_bits_left() instead of size_in_bits - get_bits_count().

Originally committed as revision 20543 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/alsdec.c

@@ -380,7 +380,7 @@ static void parse_bs_info(const uint32_t bs_info, unsigned int n,
  */
 static int32_t decode_rice(GetBitContext *gb, unsigned int k)
 {
-    int max = gb->size_in_bits - get_bits_count(gb) - k;
+    int max = get_bits_left(gb) - k;
     int q   = get_unary(gb, 0, max);
     int r   = k ? get_bits1(gb) : !(q & 1);
 

libavcodec/h261dec.c

@@ -170,7 +170,7 @@ static int ff_h261_resync(H261Context *h){
         //OK, it is not where it is supposed to be ...
         s->gb= s->last_resync_gb;
         align_get_bits(&s->gb);
-        left= s->gb.size_in_bits - get_bits_count(&s->gb);
+        left= get_bits_left(&s->gb);
 
         for(;left>15+1+4+5; left-=8){
             if(show_bits(&s->gb, 15)==0){
@@ -444,7 +444,7 @@ static int h261_decode_picture_header(H261Context *h){
     int format, i;
     uint32_t startcode= 0;
 
-    for(i= s->gb.size_in_bits - get_bits_count(&s->gb); i>24; i-=1){
+    for(i= get_bits_left(&s->gb); i>24; i-=1){
         startcode = ((startcode << 1) | get_bits(&s->gb, 1)) & 0x000FFFFF;
 
         if(startcode == 0x10)

libavcodec/h263.c

@@ -2994,7 +2994,7 @@ static int h263_decode_gob_header(MpegEncContext *s)
 
         /* We have a GBSC probably with GSTUFF */
     skip_bits(&s->gb, 16); /* Drop the zeros */
-    left= s->gb.size_in_bits - get_bits_count(&s->gb);
+    left= get_bits_left(&s->gb);
     //MN: we must check the bits left or we might end in a infinite loop (or segfault)
     for(;left>13; left--){
         if(get_bits1(&s->gb)) break; /* Seek the '1' bit */
@@ -3329,7 +3329,7 @@ int ff_h263_resync(MpegEncContext *s){
     //OK, it's not where it is supposed to be ...
     s->gb= s->last_resync_gb;
     align_get_bits(&s->gb);
-    left= s->gb.size_in_bits - get_bits_count(&s->gb);
+    left= get_bits_left(&s->gb);
 
     for(;left>16+1+5+5; left-=8){
         if(show_bits(&s->gb, 16)==0){
@@ -3774,7 +3774,7 @@ static int mpeg4_decode_partitioned_mb(MpegEncContext *s, DCTELEM block[6][64])
     /* per-MB end of slice check */
 
     if(--s->mb_num_left <= 0){
-//printf("%06X %d\n", show_bits(&s->gb, 24), s->gb.size_in_bits - get_bits_count(&s->gb));
+//printf("%06X %d\n", show_bits(&s->gb, 24), get_bits_left(&s->gb));
         if(mpeg4_is_resync(s))
             return SLICE_END;
         else
@@ -5034,7 +5034,7 @@ int h263_decode_picture_header(MpegEncContext *s)
 
     startcode= get_bits(&s->gb, 22-8);
 
-    for(i= s->gb.size_in_bits - get_bits_count(&s->gb); i>24; i-=8) {
+    for(i= get_bits_left(&s->gb); i>24; i-=8) {
         startcode = ((startcode << 8) | get_bits(&s->gb, 8)) & 0x003FFFFF;
 
         if(startcode == 0x20)

libavcodec/h263dec.c

@@ -268,8 +268,8 @@ static int decode_slice(MpegEncContext *s){
     /* try to detect the padding bug */
     if(      s->codec_id==CODEC_ID_MPEG4
        &&   (s->workaround_bugs&FF_BUG_AUTODETECT)
-       &&    s->gb.size_in_bits - get_bits_count(&s->gb) >=0
+       &&    get_bits_left(&s->gb) >=0
-       &&    s->gb.size_in_bits - get_bits_count(&s->gb) < 48
+       &&    get_bits_left(&s->gb) < 48
 //       &&   !s->resync_marker
        &&   !s->data_partitioning){
 
@@ -300,7 +300,7 @@ static int decode_slice(MpegEncContext *s){
 
     // handle formats which don't have unique end markers
     if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
-        int left= s->gb.size_in_bits - get_bits_count(&s->gb);
+        int left= get_bits_left(&s->gb);
         int max_extra=7;
 
         /* no markers in M$ crap */
@@ -325,7 +325,7 @@ static int decode_slice(MpegEncContext *s){
     }
 
     av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
-            s->gb.size_in_bits - get_bits_count(&s->gb),
+            get_bits_left(&s->gb),
             show_bits(&s->gb, 24), s->padding_bug_score);
 
     ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_END|DC_END|MV_END)&part_mask);

libavcodec/h264.c

@@ -6692,7 +6692,7 @@ static int decode_slice(struct AVCodecContext *avctx, void *arg){
         ff_init_cabac_states( &h->cabac);
         ff_init_cabac_decoder( &h->cabac,
                                s->gb.buffer + get_bits_count(&s->gb)/8,
-                               ( s->gb.size_in_bits - get_bits_count(&s->gb) + 7)/8);
+                               (get_bits_left(&s->gb) + 7)/8);
         /* calculate pre-state */
         for( i= 0; i < 460; i++ ) {
             int pre;

libavcodec/huffyuv.c

@@ -693,7 +693,7 @@ static void decode_422_bitstream(HYuvContext *s, int count){
 
     count/=2;
 
-    if(count >= (s->gb.size_in_bits - get_bits_count(&s->gb))/(31*4)){
+    if(count >= (get_bits_left(&s->gb))/(31*4)){
         for(i=0; i<count && get_bits_count(&s->gb) < s->gb.size_in_bits; i++){
             READ_2PIX(s->temp[0][2*i  ], s->temp[1][i], 1);
             READ_2PIX(s->temp[0][2*i+1], s->temp[2][i], 2);
@@ -711,7 +711,7 @@ static void decode_gray_bitstream(HYuvContext *s, int count){
 
     count/=2;
 
-    if(count >= (s->gb.size_in_bits - get_bits_count(&s->gb))/(31*2)){
+    if(count >= (get_bits_left(&s->gb))/(31*2)){
         for(i=0; i<count && get_bits_count(&s->gb) < s->gb.size_in_bits; i++){
             READ_2PIX(s->temp[0][2*i  ], s->temp[0][2*i+1], 0);
         }

libavcodec/mpeg12.c

@@ -1818,7 +1818,7 @@ static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
             s->mb_y++;
 
             if(s->mb_y<<field_pic >= s->mb_height){
-                int left= s->gb.size_in_bits - get_bits_count(&s->gb);
+                int left= get_bits_left(&s->gb);
                 int is_d10= s->chroma_format==2 && s->pict_type==FF_I_TYPE && avctx->profile==0 && avctx->level==5
                             && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
                             && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;

libavcodec/mpeg4audio.c

@@ -32,7 +32,7 @@
  */
 static int parse_config_ALS(GetBitContext *gb, MPEG4AudioConfig *c)
 {
-    if (gb->size_in_bits - get_bits_count(gb) < 112)
+    if (get_bits_left(gb) < 112)
         return -1;
 
     if (get_bits_long(gb, 32) != MKBETAG('A','L','S','\0'))

libavcodec/mpegaudiodec.c

@@ -2162,7 +2162,7 @@ static int mp_decode_frame(MPADecodeContext *s,
         s->last_buf_size=0;
         if(s->in_gb.buffer){
             align_get_bits(&s->gb);
-            i= (s->gb.size_in_bits - get_bits_count(&s->gb))>>3;
+            i= get_bits_left(&s->gb)>>3;
             if(i >= 0 && i <= BACKSTEP_SIZE){
                 memmove(s->last_buf, s->gb.buffer + (get_bits_count(&s->gb)>>3), i);
                 s->last_buf_size=i;
@@ -2174,7 +2174,7 @@ static int mp_decode_frame(MPADecodeContext *s,
 
         align_get_bits(&s->gb);
         assert((get_bits_count(&s->gb) & 7) == 0);
-        i= (s->gb.size_in_bits - get_bits_count(&s->gb))>>3;
+        i= get_bits_left(&s->gb)>>3;
 
         if(i<0 || i > BACKSTEP_SIZE || nb_frames<0){
             if(i<0)

libavcodec/msmpeg4.c

@@ -1823,7 +1823,7 @@ int ff_msmpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
         if (i > 62){
             i-= 192;
             if(i&(~63)){
-                const int left= s->gb.size_in_bits - get_bits_count(&s->gb);
+                const int left= get_bits_left(&s->gb);
                 if(((i+192 == 64 && level/qmul==-1) || s->error_recognition<=1) && left>=0){
                     av_log(s->avctx, AV_LOG_ERROR, "ignoring overflow at %d %d\n", s->mb_x, s->mb_y);
                     break;

libavcodec/wavpack.c

@@ -378,7 +378,7 @@ static float wv_get_value_float(WavpackContext *s, uint32_t *crc, int S)
 
     if(s->got_extra_bits){
         const int max_bits = 1 + 23 + 8 + 1;
-        const int left_bits = s->gb_extra_bits.size_in_bits - get_bits_count(&s->gb_extra_bits);
+        const int left_bits = get_bits_left(&s->gb_extra_bits);
 
         if(left_bits + 8 * FF_INPUT_BUFFER_PADDING_SIZE < max_bits)
             return 0.0;
@@ -897,7 +897,7 @@ static int wavpack_decode_frame(AVCodecContext *avctx,
         return -1;
     }
     if(s->got_extra_bits && avctx->sample_fmt != SAMPLE_FMT_FLT){
-        const int size = s->gb_extra_bits.size_in_bits - get_bits_count(&s->gb_extra_bits);
+        const int size = get_bits_left(&s->gb_extra_bits);
         const int wanted = s->samples * s->extra_bits << s->stereo_in;
         if(size < wanted){
             av_log(avctx, AV_LOG_ERROR, "Too small EXTRABITS\n");