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-rwxr-xr-xasdcplib/src/MPEG.cpp295
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diff --git a/asdcplib/src/MPEG.cpp b/asdcplib/src/MPEG.cpp
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-/*
-Copyright (c) 2005-2009, John Hurst
-All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions
-are met:
-1. Redistributions of source code must retain the above copyright
- notice, this list of conditions and the following disclaimer.
-2. Redistributions in binary form must reproduce the above copyright
- notice, this list of conditions and the following disclaimer in the
- documentation and/or other materials provided with the distribution.
-3. The name of the author may not be used to endorse or promote products
- derived from this software without specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
-IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
-OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
-IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
-INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
-NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
-THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-*/
-/*! \file MPEG.cpp
- \version $Id: MPEG.cpp,v 1.4 2009/04/09 19:16:49 msheby Exp $
- \brief MPEG2 VES parser
-*/
-
-#include <MPEG.h>
-#include <KM_log.h>
-using Kumu::DefaultLogSink;
-
-// walk a buffer stopping at the end of the buffer or the end of a VES
-// start code '00 00 01'. If successful, returns address of first byte
-// of start code
-ASDCP::Result_t
-ASDCP::MPEG2::FindVESStartCode(const byte_t* buf, ui32_t buf_len, StartCode_t* sc, const byte_t** new_pos)
-{
- ASDCP_TEST_NULL(buf);
- ASDCP_TEST_NULL(new_pos);
-
- ui32_t zero_i = 0;
- const byte_t* p = buf;
- const byte_t* end_p = buf + buf_len;
-
- for ( ; p < end_p; p++ )
- {
- if ( *p == 0 )
- zero_i++;
-
- else if ( *p == 1 && zero_i > 1 )
- {
- // 2 or more 0 bytes followed by a 1, start code is next
- if ( ++p == end_p )
- return RESULT_FAIL;
-
- *new_pos = p - 3;
- *sc = (StartCode_t)*p;
- return RESULT_OK;
- }
- else
- zero_i = 0;
- }
-
- *new_pos = buf + buf_len;
- return RESULT_FAIL;
-}
-
-
-//------------------------------------------------------------------------------------------
-
-//
-ASDCP::Rational
-ASDCP::MPEG2::Accessor::Sequence::AspectRatio()
-{
- switch ( m_p[3] & 0xf0 )
- {
- case 0x10: return Rational(1,1);
- case 0x20: return Rational(4,3);
- case 0x30: return Rational(16,9);
- case 0x40: return Rational(221,100);
- }
-
- DefaultLogSink().Error("Unknown AspectRatio value: %02x\n", m_p[3]);
- return Rational(0,0);
-}
-
-//------------------------------------------------------------------------------------------
-
-enum State_t {
- ST_IDLE,
- ST_START_HEADER,
- ST_IN_HEADER,
-};
-
-
-//
-class ASDCP::MPEG2::VESParser::h__StreamState
-{
-public:
- State_t m_State;
- h__StreamState() : m_State(ST_IDLE) {}
- ~h__StreamState() {}
-
- void Goto_START_HEADER() { m_State = ST_START_HEADER; }
- void Goto_IN_HEADER() { m_State = ST_IN_HEADER; }
- void Goto_IDLE() { m_State = ST_IDLE; }
- bool Test_IDLE() { return m_State == ST_IDLE; }
- bool Test_START_HEADER() { return m_State == ST_START_HEADER; }
- bool Test_IN_HEADER() { return m_State == ST_IN_HEADER; }
-};
-
-//------------------------------------------------------------------------------------------
-
-
-ASDCP::MPEG2::VESParser::VESParser() :
- m_Delegate(0), m_HBufLen(0), m_ZeroCount(0)
-{
- m_State = new h__StreamState;
-}
-
-ASDCP::MPEG2::VESParser::~VESParser()
-{
-}
-
-
-//
-void
-ASDCP::MPEG2::VESParser::SetDelegate(VESParserDelegate* Delegate)
-{
- m_Delegate = Delegate;
-}
-
-//
-void
-ASDCP::MPEG2::VESParser::Reset()
-{
- m_State->Goto_IDLE();
- m_HBufLen = 0;
- m_ZeroCount = 0;
-}
-
-//
-ASDCP::Result_t
-ASDCP::MPEG2::VESParser::Parse(const byte_t* buf, ui32_t buf_len)
-{
- ASDCP_TEST_NULL(buf);
- ASDCP_TEST_NULL(m_Delegate);
-
- Result_t result = RESULT_OK;
- register const byte_t* end_p = buf + buf_len;
- register const byte_t* run_pos = buf; // track runs of uninteresting data using a position and count
- register ui32_t run_len = 0;
-
- // search for MPEG2 headers
- // copy interesting data to a buffer and pass to delegate for processing
- for ( register const byte_t* p = buf; p < end_p; p++ )
- {
- if ( m_State->Test_IN_HEADER() )
- {
- assert(run_len==0);
- m_HBuf[m_HBufLen++] = *p;
- assert(m_HBufLen < VESHeaderBufSize);
- }
- else
- {
- run_len++;
- }
-
- if ( m_State->Test_START_HEADER() ) // *p is a start code
- {
- if ( m_HBufLen == 0) // not already collecting a header
- {
- m_HBuf[0] = m_HBuf[1] = 0; m_HBuf[2] = 1; m_HBuf[3] = *p;
-
- // is this one we want?
- if ( *p == PIC_START || *p == SEQ_START || *p == EXT_START || *p == GOP_START )
- {
- m_HBufLen = 4;
- m_State->Goto_IN_HEADER();
-
- switch ( run_len )
- {
- case 1: // we suppressed writing 001 when exiting from the last call
- case 4: // we have exactly 001x
- break;
- case 2: // we have 1x
- case 3: // we have 01x
- m_Delegate->Data(this, run_pos, (run_len == 2 ? -2 : -1));
- break;
-
- default:
- m_Delegate->Data(this, run_pos, run_len - 4);
- }
-
- run_len = 0;
- }
- else
- {
- m_State->Goto_IDLE();
-
- if ( run_len == 1 ) // did we suppress writing 001 when exiting from the last call?
- {
- m_Delegate->Data(this, m_HBuf, 4);
- run_len = 0;
- }
- }
- }
- else // currently collecting a header, requires a flush before handling
- {
- m_HBufLen -= 3; // remove the current partial start code
-
- // let the delegate handle the header
- switch( m_HBuf[3] )
- {
- case PIC_START: result = m_Delegate->Picture(this, m_HBuf, m_HBufLen); break;
- case EXT_START: result = m_Delegate->Extension(this, m_HBuf, m_HBufLen); break;
- case SEQ_START: result = m_Delegate->Sequence(this, m_HBuf, m_HBufLen); break;
- case GOP_START: result = m_Delegate->GOP(this, m_HBuf, m_HBufLen); break;
-
- default:
- DefaultLogSink().Error("Unexpected start code: %02x at byte %u\n",
- m_HBuf[3], (ui32_t)(p - buf));
- result = RESULT_RAW_FORMAT;
- }
-
- // Parser handlers return RESULT_FALSE to teriminate without error
- if ( result != RESULT_OK )
- {
- m_State->Goto_IDLE();
- return result;
- }
-
- m_HBuf[0] = m_HBuf[1] = 0; m_HBuf[2] = 1; m_HBuf[3] = *p; // 001x
- run_len = 0;
-
- // is this a header we want?
- if ( *p == PIC_START || *p == SEQ_START || *p == EXT_START || *p == GOP_START )
- {
- m_HBufLen = 4;
- m_State->Goto_IN_HEADER();
- }
- else
- {
- m_HBufLen = 0;
- m_State->Goto_IDLE();
-
- if ( *p >= FIRST_SLICE && *p <= LAST_SLICE )
- {
- result = m_Delegate->Slice(this, *p);
-
- if ( result != RESULT_OK )
- return result;
- }
-
- m_Delegate->Data(this, m_HBuf, 4);
- run_pos = p+1;
- }
- }
- }
- else if ( *p == 0 )
- {
- m_ZeroCount++;
- }
- else
- {
- if ( *p == 1 && m_ZeroCount > 1 )
- m_State->Goto_START_HEADER();
-
- m_ZeroCount = 0;
- }
- }
-
- if ( run_len > 0 )
- {
- if ( m_State->Test_START_HEADER() && run_len != 0 )
- {
- assert(run_len > 2);
- run_len -= 3;
- }
-
- // flush the current run
- m_Delegate->Data(this, run_pos, run_len);
- }
-
- return RESULT_OK;
-}
-
-
-//
-// end MPEG.cpp
-//
generated by cgit v1.2.3 (git 2.46.0) at 2026-04-08 17:10:49 +0000