1 files changed, 127 insertions, 0 deletions
diff --git a/src/video_dec/libvdpau/alterh264_bits_reader.h b/src/video_dec/libvdpau/alterh264_bits_reader.h
new file mode 100644
index 000000000..47a26aca1
--- /dev/null
+++ b/src/video_dec/libvdpau/alterh264_bits_reader.h
@@ -0,0 +1,127 @@
+/* kate: tab-indent on; indent-width 4; mixedindent off; indent-mode cstyle; remove-trailing-space on; */
+#ifndef ALTERH264_BITS_READER_H
+#define ALTERH264_BITS_READER_H
+#include <sys/types.h>
+#include <inttypes.h>
+#include <stdio.h>
+
+
+
+typedef struct {
+  uint8_t *buffer, *start;
+  int offbits, length, oflow;
+} bits_reader_t;
+
+
+
+static void
+bits_reader_set (bits_reader_t * br, uint8_t * buf, int len)
+{
+  br->buffer = br->start = buf;
+  br->offbits = 0;
+  br->length = len;
+  br->oflow = 0;
+}
+
+
+
+static inline uint32_t
+more_rbsp_data (bits_reader_t * br)
+{
+  uint8_t val[8] = { 0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01 };
+  uint8_t *buf = br->start + br->length;
+  int bit;
+
+  while (--buf >= br->buffer)
+  {
+    for (bit = 7; bit > -1; bit--)
+      if (*buf & val[bit])
+	return ((buf - br->buffer) * 8) - br->offbits + bit;
+  }
+  return 0;
+}
+
+
+
+static inline uint8_t
+bits_reader_shift (bits_reader_t * br)
+{
+  br->offbits = 0;
+  if ((br->buffer + 1) > (br->start + br->length - 1))
+  {
+    br->oflow = 1;
+    //printf("!!!!! buffer overflow !!!!!\n");
+    return 0;
+  }
+  ++br->buffer;
+  if ((*(br->buffer) == 3) && ((br->buffer - br->start) > 2)
+      && (*(br->buffer - 2) == 0) && (*(br->buffer - 1) == 0))
+  {
+    if ((br->buffer + 1) > (br->start + br->length - 1))
+    {
+      br->oflow = 1;
+      //printf("!!!!! buffer overflow !!!!!\n");
+      return 0;
+    }
+    ++br->buffer;
+  }
+  return 1;
+}
+
+
+
+static inline uint32_t
+read_bits (bits_reader_t * br, int nbits)
+{
+  uint8_t val[8] = { 0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01 };
+  uint32_t res = 0;
+
+  while (nbits)
+  {
+    res = (res << 1) + ((*br->buffer & val[br->offbits]) ? 1 : 0);
+    --nbits;
+    ++br->offbits;
+    if (br->offbits > 7)
+      if (!bits_reader_shift (br))
+	return 1;
+  }
+  return res;
+}
+
+
+
+static inline void
+skip_bits (bits_reader_t * br, int nbits)
+{
+  while (nbits)
+  {
+    --nbits;
+    ++br->offbits;
+    if (br->offbits > 7)
+      bits_reader_shift (br);
+  }
+}
+
+
+
+static inline uint32_t
+read_exp_ue (bits_reader_t * br)
+{
+  int leading = -1;
+  uint8_t b;
+
+  for (b = 0; !b; leading++)
+    b = read_bits (br, 1);
+
+  return (1 << leading) - 1 + read_bits (br, leading);
+}
+
+
+
+static inline int32_t
+read_exp_se (bits_reader_t * br)
+{
+  uint32_t res = read_exp_ue (br);
+  return (res & 0x01) ? (res + 1) / 2 : -(res / 2);
+}
+#endif /* ALTERH264_BITS_READER_H */