png: check bit depth for PAL8/Y400A pixel formats.

[ffmpeg] / libavcodec / get_bits.h

diff --git a/libavcodec/get_bits.h b/libavcodec/get_bits.h
index 4aa5da86bb47d411c83d02127036f58d23137b56..64393bc9d9ead92dfd8c3797422a75bf44c0551e 100644 (file)
--- a/libavcodec/get_bits.h
+++ b/libavcodec/get_bits.h
@@ -49,8 +49,6 @@
 #define UNCHECKED_BITSTREAM_READER !CONFIG_SAFE_BITSTREAM_READER
 #endif
 
-/* bit input */
-/* buffer, buffer_end and size_in_bits must be present and used by every reader */
 typedef struct GetBitContext {
     const uint8_t *buffer, *buffer_end;
     int index;
@@ -110,11 +108,8 @@ SKIP_CACHE(name, gb, num)
 SKIP_COUNTER(name, gb, num)
     will increment the internal bit counter (see SKIP_CACHE & SKIP_BITS)
 
-LAST_SKIP_CACHE(name, gb, num)
-    will remove the next num bits from the cache if it is needed for UPDATE_CACHE otherwise it will do nothing
-
 LAST_SKIP_BITS(name, gb, num)
-    is equivalent to LAST_SKIP_CACHE; SKIP_COUNTER
+    like SKIP_BITS, to be used if next call is UPDATE_CACHE or CLOSE_READER
 
 for examples see get_bits, show_bits, skip_bits, get_vlc
 */
@@ -125,13 +120,26 @@ for examples see get_bits, show_bits, skip_bits, get_vlc
 #   define MIN_CACHE_BITS 25
 #endif
 
+#if UNCHECKED_BITSTREAM_READER
 #define OPEN_READER(name, gb)                   \
     unsigned int name##_index = (gb)->index;    \
     unsigned int av_unused name##_cache = 0
 
+#define HAVE_BITS_REMAINING(name, gb) 1
+#else
+#define OPEN_READER(name, gb)                   \
+    unsigned int name##_index = (gb)->index;    \
+    unsigned int av_unused name##_cache = 0;    \
+    unsigned int av_unused name##_size_plus8 =  \
+                (gb)->size_in_bits_plus8
+
+#define HAVE_BITS_REMAINING(name, gb)           \
+    name##_index < name##_size_plus8
+#endif
+
 #define CLOSE_READER(name, gb) (gb)->index = name##_index
 
-#ifdef ALT_BITSTREAM_READER_LE
+#ifdef BITSTREAM_READER_LE
 
 # ifdef LONG_BITSTREAM_READER
 #   define UPDATE_CACHE(name, gb) name##_cache = \
@@ -157,12 +165,11 @@ for examples see get_bits, show_bits, skip_bits, get_vlc
 
 #endif
 
-// FIXME name?
 #if UNCHECKED_BITSTREAM_READER
 #   define SKIP_COUNTER(name, gb, num) name##_index += (num)
 #else
 #   define SKIP_COUNTER(name, gb, num) \
-    name##_index = FFMIN((gb)->size_in_bits_plus8, name##_index + (num))
+    name##_index = FFMIN(name##_size_plus8, name##_index + (num))
 #endif
 
 #define SKIP_BITS(name, gb, num) do {           \
@@ -171,9 +178,8 @@ for examples see get_bits, show_bits, skip_bits, get_vlc
     } while (0)
 
 #define LAST_SKIP_BITS(name, gb, num) SKIP_COUNTER(name, gb, num)
-#define LAST_SKIP_CACHE(name, gb, num)
 
-#ifdef ALT_BITSTREAM_READER_LE
+#ifdef BITSTREAM_READER_LE
 #   define SHOW_UBITS(name, gb, num) zero_extend(name##_cache, num)
 #   define SHOW_SBITS(name, gb, num) sign_extend(name##_cache, num)
 #else
@@ -200,7 +206,6 @@ static inline void skip_bits_long(GetBitContext *s, int n){
  * read mpeg1 dc style vlc (sign bit + mantisse with no MSB).
  * if MSB not set it is negative
  * @param n length in bits
- * @author BERO
  */
 static inline int get_xbits(GetBitContext *s, int n)
 {
@@ -254,7 +259,6 @@ static inline unsigned int show_bits(GetBitContext *s, int n)
 
 static inline void skip_bits(GetBitContext *s, int n)
 {
- //Note gcc seems to optimize this to s->index+=n for the ALT_READER :))
     OPEN_READER(re, s);
     UPDATE_CACHE(re, s);
     LAST_SKIP_BITS(re, s, n);
@@ -265,7 +269,7 @@ static inline unsigned int get_bits1(GetBitContext *s)
 {
     unsigned int index = s->index;
     uint8_t result = s->buffer[index>>3];
-#ifdef ALT_BITSTREAM_READER_LE
+#ifdef BITSTREAM_READER_LE
     result >>= index & 7;
     result &= 1;
 #else
@@ -299,7 +303,7 @@ static inline unsigned int get_bits_long(GetBitContext *s, int n)
     if (n <= MIN_CACHE_BITS)
         return get_bits(s, n);
     else {
-#ifdef ALT_BITSTREAM_READER_LE
+#ifdef BITSTREAM_READER_LE
         int ret = get_bits(s, 16);
         return ret | (get_bits(s, n-16) << 16);
 #else
@@ -344,9 +348,6 @@ static inline int check_marker(GetBitContext *s, const char *msg)
  * @param buffer bitstream buffer, must be FF_INPUT_BUFFER_PADDING_SIZE bytes larger than the actual read bits
  * because some optimized bitstream readers read 32 or 64 bit at once and could read over the end
  * @param bit_size the size of the buffer in bits
- *
- * While GetBitContext stores the buffer size, for performance reasons you are
- * responsible for checking for the buffer end yourself (take advantage of the padding)!
  */
 static inline void init_get_bits(GetBitContext *s, const uint8_t *buffer,
                                  int bit_size)
@@ -376,19 +377,19 @@ static inline void align_get_bits(GetBitContext *s)
                  bits, bits_wrap, bits_size,            \
                  codes, codes_wrap, codes_size,         \
                  flags)                                 \
-        init_vlc_sparse(vlc, nb_bits, nb_codes,         \
-                        bits, bits_wrap, bits_size,     \
-                        codes, codes_wrap, codes_size,  \
-                        NULL, 0, 0, flags)
+        ff_init_vlc_sparse(vlc, nb_bits, nb_codes,         \
+                           bits, bits_wrap, bits_size,     \
+                           codes, codes_wrap, codes_size,  \
+                           NULL, 0, 0, flags)
 
-int init_vlc_sparse(VLC *vlc, int nb_bits, int nb_codes,
+int ff_init_vlc_sparse(VLC *vlc, int nb_bits, int nb_codes,
              const void *bits, int bits_wrap, int bits_size,
              const void *codes, int codes_wrap, int codes_size,
              const void *symbols, int symbols_wrap, int symbols_size,
              int flags);
 #define INIT_VLC_LE         2
 #define INIT_VLC_USE_NEW_STATIC 4
-void free_vlc(VLC *vlc);
+void ff_free_vlc(VLC *vlc);
 
 #define INIT_VLC_STATIC(vlc, bits, a,b,c,d,e,f,g, static_size) do {     \
         static VLC_TYPE table[static_size][2];                          \
@@ -462,7 +463,7 @@ void free_vlc(VLC *vlc);
 
 
 /**
- * Parse a vlc code, faster than get_vlc().
+ * Parse a vlc code.
  * @param bits is the number of bits which will be read at once, must be
  *             identical to nb_bits in init_vlc()
  * @param max_depth is the number of times bits bits must be read to completely