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dependencies/ih264d/decoder/ih264d_bitstrm.c

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+/******************************************************************************
+ *
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ *****************************************************************************
+ * Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore
+*/
+
+/*!
+ **************************************************************************
+ * \file ih264d_bitstrm.c
+ *
+ * \brief
+ *    Bitstream parsing routines
+ *
+ * \date
+ *    20/11/2002
+ *
+ * \author  AI
+ **************************************************************************
+ */
+
+#include <stdlib.h>
+#include "ih264_typedefs.h"
+#include "ih264_macros.h"
+#include "ih264_platform_macros.h"
+#include "ih264d_bitstrm.h"
+#include "ih264d_error_handler.h"
+
+#include "ih264d_debug.h"
+#include "ih264d_tables.h"
+#include "ih264d_structs.h"
+
+/*!
+ **************************************************************************
+ * \if Function name : ih264d_get_bit_h264 \endif
+ *
+ * \brief
+ *    Read one bit from the bitstream.
+ *
+ *   This is a Bitstream processing function. It reads the
+ *   bit currently pointed by the bit pointer in the
+ *   buffer and advances the pointer by one. It returns
+ *   the bit (0 or 1) in the form of an unsigned integer.
+ *
+ * \return
+ *    Returns the next bit (0 or 1) in the bitstream.
+ *
+ **************************************************************************
+ */
+UWORD8 ih264d_get_bit_h264(dec_bit_stream_t *ps_stream)
+{
+    UWORD32 u4_code;
+
+    GETBIT(u4_code, ps_stream->u4_ofst, ps_stream->pu4_buffer);
+    return (u4_code);
+}
+
+/*!
+ **************************************************************************
+ * \if Function name : ih264d_get_bits_h264 \endif
+ *
+ * \brief
+ *    Read specified number of bits from the bitstream.
+ *
+ *   This is a Bitstream processing function. It reads the
+ *   number specified number of bits from the current bit
+ *   position and advances the bit and byte pointers
+ *   appropriately.
+ *
+ * \return
+ *    An unsigned 32 bit integer with its least significant bits
+ *    containing the bits in order of their occurence in the bitstream.
+ *
+ **************************************************************************
+ */
+
+UWORD32 ih264d_get_bits_h264(dec_bit_stream_t *ps_bitstrm, UWORD32 u4_num_bits)
+{
+    UWORD32 u4_code = 0;
+    if(u4_num_bits)
+        GETBITS(u4_code, ps_bitstrm->u4_ofst, ps_bitstrm->pu4_buffer, u4_num_bits);
+    return (u4_code);
+}
+
+/*!
+ **************************************************************************
+ * \if Function name : ih264d_next_bits_h264 \endif
+ *
+ * \brief
+ *    Peek specified number of bits from the bitstream.
+ *
+ *   This is a Bitstream processing function. It gets the
+ *   specified number of bits from the buffer without
+ *   altering the current pointers. It is equivalent to
+ *   next_bits() function in the standard.
+ *
+ * \return
+ *    An unsigned 32 bit integer with its least significant bits
+ *    containing the bits in order of their occurence in the bitstream.
+ **************************************************************************
+ */
+UWORD32 ih264d_next_bits_h264(dec_bit_stream_t *ps_bitstrm, UWORD32 u4_num_bits)
+{
+    UWORD32 u4_word_off = (ps_bitstrm->u4_ofst >> 5);
+    UWORD32 u4_bit_off = ps_bitstrm->u4_ofst & 0x1F;
+    UWORD32 *pu4_bitstream = ps_bitstrm->pu4_buffer;
+    UWORD32 u4_bits = pu4_bitstream[u4_word_off++] << u4_bit_off;
+
+    /*************************************************************************/
+    /* Test if number of bits to be read exceeds the number of bits in the   */
+    /* current word. If yes, read from the next word of the buffer, The bits */
+    /* from both the words are concatenated to get next 32 bits in 'u4_bits' */
+    /*************************************************************************/
+    if(u4_bit_off > (INT_IN_BITS - u4_num_bits))
+        u4_bits |= (pu4_bitstream[u4_word_off] >> (INT_IN_BITS - u4_bit_off));
+
+    return ((u4_bits >> (INT_IN_BITS - u4_num_bits)));
+}
+
+/*!
+ **************************************************************************
+ * \if Function name : ih264d_flush_bits_h264 \endif
+ *
+ * \brief
+ *    Flush specified number of bits from the bitstream.
+ *
+ *   This function flushes the specified number of bits (marks
+ *   as read) from the buffer.
+ *
+ * \return
+ *     A 8 bit unsigned integer with value
+ *    '1' on successful flush
+ *    '0' on failure.
+ *
+ **************************************************************************
+ */
+WORD32 ih264d_flush_bits_h264(dec_bit_stream_t *ps_bitstrm, WORD32 u4_num_bits)
+{
+    ps_bitstrm->u4_ofst += u4_num_bits;
+
+    if(ps_bitstrm->u4_ofst > ps_bitstrm->u4_max_ofst)
+    {
+        return ERROR_EOB_FLUSHBITS_T;
+    }
+    return OK;
+}
+
+/*!
+ **************************************************************************
+ * \if Function name : ih264d_check_byte_aligned \endif
+ *
+ * \brief
+ *    Checks whether the bit ps_bitstrm u4_ofst is at byte boundary.
+ *
+ * \param ps_bitstrm : Pointer to bitstream
+ *
+ * \return
+ *    Returns 1 if bit ps_bitstrm u4_ofst is at byte alligned position else zero.
+ **************************************************************************
+ */
+
+UWORD8 ih264d_check_byte_aligned(dec_bit_stream_t * ps_bitstrm)
+{
+    if(ps_bitstrm->u4_ofst & 0x07)
+        return (0);
+    else
+        return (1);
+}