mm-video-v4l2/vidc/vdec/src/hevc_utils.cpp

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/*========================================================================

                      O p e n M M
         V i d e o   U t i l i t i e s

*//** @file VideoUtils.cpp
  This module contains utilities and helper routines.

@par EXTERNALIZED FUNCTIONS

@par INITIALIZATION AND SEQUENCING REQUIREMENTS
  (none)

*//*====================================================================== */

/* =======================================================================

                     INCLUDE FILES FOR MODULE

========================================================================== */
#include "hevc_utils.h"
#include "vidc_debug.h"
#include <string.h>
#include <stdlib.h>
#include <limits.h>
#include <sys/time.h>
#ifdef _ANDROID_
#include <cutils/properties.h>
#endif


/* =======================================================================

                DEFINITIONS AND DECLARATIONS FOR MODULE

This section contains definitions for constants, macros, types, variables
and other items needed by this module.

========================================================================== */

HEVC_Utils::HEVC_Utils()
{
    initialize_frame_checking_environment();
}

HEVC_Utils::~HEVC_Utils()
{
}

/***********************************************************************/
/*
FUNCTION:
HEVC_Utils::initialize_frame_checking_environment

DESCRIPTION:
Extract RBSP data from a NAL

INPUT/OUTPUT PARAMETERS:
None

RETURN VALUE:
boolean

SIDE EFFECTS:
None.
 */
/***********************************************************************/
void HEVC_Utils::initialize_frame_checking_environment()
{
    m_forceToStichNextNAL = false;
    m_au_data = false;
    nalu_type = NAL_UNIT_INVALID;
}

/*===========================================================================
FUNCTION:
HEVC_Utils::iSNewFrame

DESCRIPTION:
Returns true if NAL parsing successfull otherwise false.

INPUT/OUTPUT PARAMETERS:
<In>
buffer : buffer containing start code or nal length + NAL units
buffer_length : the length of the NAL buffer
start_code : If true, start code is detected,
otherwise size nal length is detected
size_of_nal_length_field: size of nal length field
<out>
isNewFrame: true if the NAL belongs to a differenet frame
false if the NAL belongs to a current frame

RETURN VALUE:
boolean  true, if nal parsing is successful
false, if the nal parsing has errors

SIDE EFFECTS:
None.
===========================================================================*/
bool HEVC_Utils::isNewFrame(OMX_BUFFERHEADERTYPE *p_buf_hdr,
        OMX_IN OMX_U32 size_of_nal_length_field,
        OMX_OUT OMX_BOOL &isNewFrame)
{
    OMX_IN OMX_U8 *buffer = p_buf_hdr->pBuffer;
    OMX_IN OMX_U32 buffer_length = p_buf_hdr->nFilledLen;
    byte bFirstSliceInPic = 0;

    byte coef1=1, coef2=0, coef3=0;
    uint32 pos = 0;
    uint32 nal_len = buffer_length;
    uint32 sizeofNalLengthField = 0;
    uint32 zero_count;
    boolean start_code = (size_of_nal_length_field==0)?true:false;

    if (start_code) {
        // Search start_code_prefix_one_3bytes (0x000001)
        coef2 = buffer[pos++];
        coef3 = buffer[pos++];

        do {
            if (pos >= buffer_length) {
                DEBUG_PRINT_ERROR("ERROR: In %s() - line %d", __func__, __LINE__);
                return false;
            }

            coef1 = coef2;
            coef2 = coef3;
            coef3 = buffer[pos++];
        } while (coef1 || coef2 || coef3 != 1);
    } else if (size_of_nal_length_field) {
        /* This is the case to play multiple NAL units inside each access unit*/
        /* Extract the NAL length depending on sizeOfNALength field */
        sizeofNalLengthField = size_of_nal_length_field;
        nal_len = 0;

        while (size_of_nal_length_field--) {
            nal_len |= buffer[pos++]<<(size_of_nal_length_field<<3);
        }

        if (nal_len >= buffer_length) {
            DEBUG_PRINT_ERROR("ERROR: In %s() - line %d", __func__, __LINE__);
            return false;
        }
    }

    if (nal_len > buffer_length) {
        DEBUG_PRINT_ERROR("ERROR: In %s() - line %d", __func__, __LINE__);
        return false;
    }

    if (pos + 2 > (nal_len + sizeofNalLengthField)) {
        DEBUG_PRINT_ERROR("ERROR: In %s() - line %d", __func__, __LINE__);
        return false;
    }

    nalu_type = (buffer[pos] & 0x7E)>>1 ;      //=== nal_unit_type

    DEBUG_PRINT_LOW("@#@# Pos = %x NalType = %x buflen = %u", pos-1, nalu_type, (unsigned int) buffer_length);

    isNewFrame =  OMX_FALSE;

    if (nalu_type == NAL_UNIT_VPS ||
            nalu_type == NAL_UNIT_SPS ||
            nalu_type == NAL_UNIT_PPS ||
            nalu_type == NAL_UNIT_SEI) {
        DEBUG_PRINT_LOW("Non-AU boundary with NAL type %d", nalu_type);

        if (m_au_data) {
            isNewFrame = OMX_TRUE;
            m_au_data = false;
        }

        m_forceToStichNextNAL = true;
    } else if (nalu_type <= NAL_UNIT_RESERVED_23) {
        DEBUG_PRINT_LOW("AU Boundary with NAL type %d ", nalu_type);

        if (!m_forceToStichNextNAL) {
            bFirstSliceInPic = ((buffer[pos+2] & 0x80)>>7);

            if (bFirstSliceInPic) {    //=== first_ctb_in_slice is only 1'b1  coded tree block
                DEBUG_PRINT_LOW("Found a New Frame due to 1st coded tree block");
                isNewFrame = OMX_TRUE;
            }
        }

        m_au_data = true;
        m_forceToStichNextNAL = false;
    }

    DEBUG_PRINT_LOW("get_HEVC_nal_type - newFrame value %d",isNewFrame);
    return true;
}