Initial community commit

Src/h264dec/ldecod/src/meminput.c

@@ -0,0 +1,134 @@
+#include "global.h"
+#include "meminput.h"
+
+void malloc_mem_input(VideoParameters *p_Vid)
+{
+  if ( (p_Vid->mem_input = (memory_input_t *) calloc(1, sizeof(memory_input_t))) == NULL)
+  {
+    snprintf(errortext, ET_SIZE, "Memory allocation for memory input failed");
+    error(errortext,100);
+  }  
+}
+
+void free_mem_input(VideoParameters *p_Vid)
+{
+  free(p_Vid->mem_input);
+  p_Vid->mem_input = NULL;
+}
+
+/*!
+************************************************************************
+* \brief
+*    returns a byte from IO buffer
+************************************************************************
+*/
+static inline uint8_t getfbyte(memory_input_t *mem_input)
+{
+   return mem_input->user_buffer[mem_input->user_buffer_read++];
+}
+
+
+/*!
+ ************************************************************************
+ * \brief
+ *    returns if new start code is found at byte aligned position buf.
+ *    new-startcode is of form N 0x00 bytes, followed by a 0x01 byte.
+ *
+ *  \return
+ *     1 if start-code is found or                      \n
+ *     0, indicating that there is no start code
+ *
+ *  \param Buf
+ *     pointer to byte-stream
+ *  \param zeros_in_startcode
+ *     indicates number of 0x00 bytes in start-code.
+ ************************************************************************
+ */
+static inline int FindStartCode (unsigned char *Buf, int zeros_in_startcode)
+{
+  int i;
+
+  for (i = 0; i < zeros_in_startcode; i++)
+  {
+    if(*(Buf++) != 0)
+    {
+      return 0;
+    }
+  }
+
+  if(*Buf != 1)
+    return 0;
+
+  return 1;
+}
+
+
+/*!
+ ************************************************************************
+ * \brief
+ *    Returns the size of the NALU (bits between start codes in case of
+ *    Annex B.  nalu->buf and nalu->len are filled.  Other field in
+ *    nalu-> remain uninitialized (will be taken care of by NALUtoRBSP.
+ *
+ * \return
+ *     0 if there is nothing any more to read (EOF)
+ *    -1 in case of any error
+ *
+ *  \note Side-effect: Returns length of start-code in bytes.
+ *
+ * \note
+ *   GetAnnexbNALU expects start codes at byte aligned positions in the file
+ *
+ ************************************************************************
+ */
+int GetMemoryNALU (VideoParameters *p_Vid, NALU_t *nalu)
+{
+	memory_input_t *mem_input = p_Vid->mem_input;
+	if (!mem_input->user_buffer)
+		return 0;
+	nalu->len = mem_input->user_buffer_size;
+	memcpy(nalu->buf, mem_input->user_buffer, nalu->len);
+	memzero16(nalu->buf+nalu->len); // add some extra 0's to the end
+	nalu->forbidden_bit     = (*(nalu->buf) >> 7) & 1;
+	nalu->nal_reference_idc = (NalRefIdc) ((*(nalu->buf) >> 5) & 3);
+	nalu->nal_unit_type     = (NaluType) ((*(nalu->buf)) & 0x1f);
+	nalu->lost_packets = 0;
+	mem_input->user_buffer = 0;
+
+	if (mem_input->skip_b_frames && nalu->nal_reference_idc == NALU_PRIORITY_DISPOSABLE)
+		return 0;
+
+	if (mem_input->resetting && nalu->nal_unit_type != NALU_TYPE_IDR)
+		return 0;
+
+	mem_input->resetting = 0;
+
+	return 1;
+}
+
+
+/*!
+ ************************************************************************
+ * \brief
+ *    Opens the bit stream file named fn
+ * \return
+ *    none
+ ************************************************************************
+ */
+void OpenMemory(VideoParameters *p_Vid, const char *fn)
+{
+  memory_input_t *mem_input = p_Vid->mem_input;
+}
+
+
+/*!
+ ************************************************************************
+ * \brief
+ *    Closes the bit stream file
+ ************************************************************************
+ */
+void CloseMemory(VideoParameters *p_Vid)
+{
+    memory_input_t *mem_input = p_Vid->mem_input;
+}
+