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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 "h264_utils.h"
#include "omx_vdec.h"
#include <string.h>
#include <stdlib.h>
/* =======================================================================
DEFINITIONS AND DECLARATIONS FOR MODULE
This section contains definitions for constants, macros, types, variables
and other items needed by this module.
========================================================================== */
#define SIZE_NAL_FIELD_MAX 4
#define BASELINE_PROFILE 66
#define MAIN_PROFILE 77
#define HIGH_PROFILE 100
#define MAX_SUPPORTED_LEVEL 32
RbspParser::RbspParser (const uint8 *_begin, const uint8 *_end)
: begin (_begin), end(_end), pos (- 1), bit (0),
cursor (0xFFFFFF), advanceNeeded (true)
{
}
// Destructor
/*lint -e{1540} Pointer member neither freed nor zeroed by destructor
* No problem
*/
RbspParser::~RbspParser () {}
// Return next RBSP byte as a word
uint32 RbspParser::next ()
{
if (advanceNeeded) advance ();
//return static_cast<uint32> (*pos);
return static_cast<uint32> (begin[pos]);
}
// Advance RBSP decoder to next byte
void RbspParser::advance ()
{
++pos;
//if (pos >= stop)
if (begin + pos == end)
{
/*lint -e{730} Boolean argument to function
* I don't see a problem here
*/
//throw false;
DEBUG_PRINT_LOW("H264Parser-->NEED TO THROW THE EXCEPTION...\n");
}
cursor <<= 8;
//cursor |= static_cast<uint32> (*pos);
cursor |= static_cast<uint32> (begin[pos]);
if ((cursor & 0xFFFFFF) == 0x000003)
{
advance ();
}
advanceNeeded = false;
}
// Decode unsigned integer
uint32 RbspParser::u (uint32 n)
{
uint32 i, s, x = 0;
for (i = 0; i < n; i += s)
{
s = static_cast<uint32>STD_MIN(static_cast<int>(8 - bit),
static_cast<int>(n - i));
x <<= s;
x |= ((next () >> ((8 - static_cast<uint32>(bit)) - s)) &
((1 << s) - 1));
bit = (bit + s) % 8;
if (!bit)
{
advanceNeeded = true;
}
}
return x;
}
// Decode unsigned integer Exp-Golomb-coded syntax element
uint32 RbspParser::ue ()
{
int leadingZeroBits = -1;
for (uint32 b = 0; !b; ++leadingZeroBits)
{
b = u (1);
}
return ((1 << leadingZeroBits) - 1) +
u (static_cast<uint32>(leadingZeroBits));
}
// Decode signed integer Exp-Golomb-coded syntax element
int32 RbspParser::se ()
{
const uint32 x = ue ();
if (!x) return 0;
else if (x & 1) return static_cast<int32> ((x >> 1) + 1);
else return - static_cast<int32> (x >> 1);
}
void H264_Utils::allocate_rbsp_buffer(uint32 inputBufferSize)
{
m_rbspBytes = (byte *) calloc(1,inputBufferSize);
m_prv_nalu.nal_ref_idc = 0;
m_prv_nalu.nalu_type = NALU_TYPE_UNSPECIFIED;
}
H264_Utils::H264_Utils(): m_height(0),
m_width(0),
m_rbspBytes(NULL),
m_au_data (false)
{
initialize_frame_checking_environment();
}
H264_Utils::~H264_Utils()
{
/* if(m_pbits)
{
delete(m_pbits);
m_pbits = NULL;
}
*/
if (m_rbspBytes)
{
free(m_rbspBytes);
m_rbspBytes = NULL;
}
}
/***********************************************************************/
/*
FUNCTION:
H264_Utils::initialize_frame_checking_environment
DESCRIPTION:
Extract RBSP data from a NAL
INPUT/OUTPUT PARAMETERS:
None
RETURN VALUE:
boolean
SIDE EFFECTS:
None.
*/
/***********************************************************************/
void H264_Utils::initialize_frame_checking_environment()
{
m_forceToStichNextNAL = false;
m_au_data = false;
m_prv_nalu.nal_ref_idc = 0;
m_prv_nalu.nalu_type = NALU_TYPE_UNSPECIFIED;
}
/***********************************************************************/
/*
FUNCTION:
H264_Utils::extract_rbsp
DESCRIPTION:
Extract RBSP data from a NAL
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>
rbsp_bistream : extracted RBSP bistream
rbsp_length : the length of the RBSP bitstream
nal_unit : decoded NAL header information
RETURN VALUE:
boolean
SIDE EFFECTS:
None.
*/
/***********************************************************************/
boolean H264_Utils::extract_rbsp(OMX_IN OMX_U8 *buffer,
OMX_IN OMX_U32 buffer_length,
OMX_IN OMX_U32 size_of_nal_length_field,
OMX_OUT OMX_U8 *rbsp_bistream,
OMX_OUT OMX_U32 *rbsp_length,
OMX_OUT NALU *nal_unit)
{
byte coef1, coef2, coef3;
uint32 pos = 0;
uint32 nal_len = buffer_length;
uint32 sizeofNalLengthField = 0;
uint32 zero_count;
boolean eRet = true;
boolean start_code = (size_of_nal_length_field==0)?true:false;
DEBUG_PRINT_LOW("extract_rbsp\n");
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 + 1 > (nal_len + sizeofNalLengthField))
{
DEBUG_PRINT_ERROR("ERROR: In %s() - line %d", __func__, __LINE__);
return false;
}
if (nal_unit->forbidden_zero_bit = (buffer[pos] & 0x80))
{
DEBUG_PRINT_ERROR("ERROR: In %s() - line %d", __func__, __LINE__);
}
nal_unit->nal_ref_idc = (buffer[pos] & 0x60) >> 5;
nal_unit->nalu_type = buffer[pos++] & 0x1f;
DEBUG_PRINT_LOW("\n@#@# Pos = %x NalType = %x buflen = %d",pos-1,nal_unit->nalu_type,buffer_length);
*rbsp_length = 0;
if( nal_unit->nalu_type == NALU_TYPE_EOSEQ ||
nal_unit->nalu_type == NALU_TYPE_EOSTREAM)
return (nal_len + sizeofNalLengthField);
zero_count = 0;
while (pos < (nal_len+sizeofNalLengthField)) //similar to for in p-42
{
if( zero_count == 2 ) {
if( buffer[pos] == 0x03 ) {
pos ++;
zero_count = 0;
continue;
}
if( buffer[pos] <= 0x01 ) {
if( start_code ) {
*rbsp_length -= 2;
pos -= 2;
return pos;
}
}
zero_count = 0;
}
zero_count ++;
if( buffer[pos] != 0 )
zero_count = 0;
rbsp_bistream[(*rbsp_length)++] = buffer[pos++];
}
return eRet;
}
/*===========================================================================
FUNCTION:
H264_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 H264_Utils::isNewFrame(OMX_IN OMX_U8 *buffer,
OMX_IN OMX_U32 buffer_length,
OMX_IN OMX_U32 size_of_nal_length_field,
OMX_OUT OMX_BOOL &isNewFrame)
{
NALU nal_unit;
uint16 first_mb_in_slice = 0;
uint32 numBytesInRBSP = 0;
bool eRet = true;
DEBUG_PRINT_LOW("get_h264_nal_type %p nal_length %d nal_length_field %d\n",
buffer, buffer_length, size_of_nal_length_field);
if ( false == extract_rbsp(buffer, buffer_length, size_of_nal_length_field,
m_rbspBytes, &numBytesInRBSP, &nal_unit) )
{
DEBUG_PRINT_ERROR("ERROR: In %s() - extract_rbsp() failed", __func__);
isNewFrame = OMX_FALSE;
eRet = false;
}
else
{
switch (nal_unit.nalu_type)
{
case NALU_TYPE_IDR:
case NALU_TYPE_NON_IDR:
{
DEBUG_PRINT_LOW("\n Found a AU Boundary %d ",nal_unit.nalu_type);
if (m_forceToStichNextNAL)
{
isNewFrame = OMX_FALSE;
}
else
{
RbspParser rbsp_parser(m_rbspBytes, (m_rbspBytes+numBytesInRBSP));
first_mb_in_slice = rbsp_parser.ue();
if((!first_mb_in_slice) || /*(slice.prv_frame_num != slice.frame_num ) ||*/
( (m_prv_nalu.nal_ref_idc != nal_unit.nal_ref_idc) && ( nal_unit.nal_ref_idc * m_prv_nalu.nal_ref_idc == 0 ) ) ||
/*( ((m_prv_nalu.nalu_type == NALU_TYPE_IDR) && (nal_unit.nalu_type == NALU_TYPE_IDR)) && (slice.idr_pic_id != slice.prv_idr_pic_id) ) || */
( (m_prv_nalu.nalu_type != nal_unit.nalu_type ) && ((m_prv_nalu.nalu_type == NALU_TYPE_IDR) || (nal_unit.nalu_type == NALU_TYPE_IDR)) ) )
{
//DEBUG_PRINT_LOW("Found a New Frame due to NALU_TYPE_IDR/NALU_TYPE_NON_IDR");
isNewFrame = OMX_TRUE;
}
else
{
isNewFrame = OMX_FALSE;
}
}
m_au_data = true;
m_forceToStichNextNAL = false;
break;
}
case NALU_TYPE_SPS:
case NALU_TYPE_PPS:
case NALU_TYPE_SEI:
case NALU_TYPE_UNSPECIFIED:
case NALU_TYPE_EOSEQ:
case NALU_TYPE_EOSTREAM:
{
DEBUG_PRINT_LOW("\n Non AU boundary NAL %d",nal_unit.nalu_type);
if(m_au_data)
{
isNewFrame = OMX_TRUE;
m_au_data = false;
}
else
{
isNewFrame = OMX_FALSE;
}
m_forceToStichNextNAL = true;
break;
}
case NALU_TYPE_ACCESS_DELIM:
default:
{
isNewFrame = OMX_FALSE;
// Do not update m_forceToStichNextNAL
break;
}
} // end of switch
} // end of if
m_prv_nalu = nal_unit;
DEBUG_PRINT_LOW("get_h264_nal_type - newFrame value %d\n",isNewFrame);
return eRet;
}