avcodec/get_bits: add BITS_LEFT() for finding the bits left with an opened reader

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 5 insertions, 0 deletions

diff --git a/libavcodec/get_bits.h b/libavcodec/get_bits.h
index fd32535d2a..90235e319b 100644
--- a/libavcodec/get_bits.h
+++ b/libavcodec/get_bits.h
@@ -113,6 +113,9 @@ typedef struct RL_VLC_ELEM {
  * LAST_SKIP_BITS(name, gb, num)
  *   Like SKIP_BITS, to be used if next call is UPDATE_CACHE or CLOSE_READER.
  *
+ * BITS_LEFT(name, gb)
+ *   Return the number of bits left
+ *
  * For examples see get_bits, show_bits, skip_bits, get_vlc.
  */
 
@@ -179,6 +182,8 @@ typedef struct RL_VLC_ELEM {
     name ## _index = FFMIN(name ## _size_plus8, name ## _index + (num))
 #endif
 
+#define BITS_LEFT(name, gb) ((int)((gb)->size_in_bits - name ## _index))
+
 #define SKIP_BITS(name, gb, num)                \
     do {                                        \
         SKIP_CACHE(name, gb, num);              \