source: svn/trunk/newcon3bcm2_21bu/BSEAV/lib/mpeg2_ts_parse/psip_eit.c

/***************************************************************************
 *     Copyright (c) 2003, Broadcom Corporation
 *     All Rights Reserved
 *     Confidential Property of Broadcom Corporation
 *
 *  THIS SOFTWARE MAY ONLY BE USED SUBJECT TO AN EXECUTED SOFTWARE LICENSE
 *  AGREEMENT  BETWEEN THE USER AND BROADCOM.  YOU HAVE NO RIGHT TO USE OR
 *  EXPLOIT THIS MATERIAL EXCEPT SUBJECT TO THE TERMS OF SUCH AN AGREEMENT.
 *
 * $brcm_Workfile: psip_eit.c $
 * $brcm_Revision: 1 $
 * $brcm_Date: 2/7/05 11:25p $
 *
 * [File Description:]
 *
 * Revision History:
 *
 * $brcm_Log: /BSEAV/lib/mpeg2_ts_parse/psip_eit.c $
 * 
 * 1   2/7/05 11:25p dlwin
 * Merge down for release 2005_REFSW_MERGETOMAIN:
 * 
 * Irvine_BSEAVSW_Devel/2   2/4/04 9:56a erickson
 * PR9217: converted BDBG_ASSERT calls to CHECK calls. Don't assert on bad
 * data.
 * 
 * Irvine_BSEAVSW_Devel/1   8/29/03 5:03p marcusk
 * Initial Version.
 *
 ***************************************************************************/
#include "bstd.h"
#include "psip_priv.h"
#include "psip_eit.h"
BDBG_MODULE(psip_eit);

#define TITLE_LENGTH_BYTE_OFFSET                (byteOffset+9)
#define DESCRIPTOR_LENGTH_BYTE_OFFSET   (TITLE_LENGTH_BYTE_OFFSET+1+buf[TITLE_LENGTH_BYTE_OFFSET])

static int PSIP_EIT_P_getEventByteOffset( const uint8_t *buf, int eventNum )
{
        uint8_t i;
        int byteOffset = PSIP_TABLE_DATA_OFFSET + 1;

        if( eventNum == -1 )
        {
                eventNum = buf[PSIP_TABLE_DATA_OFFSET];
        }

        /* Jump to correct table (or first byte after last table) */
        for( i = 0; i < eventNum; i++ )
        {
                byteOffset += 12 + buf[TITLE_LENGTH_BYTE_OFFSET] + (TS_READ_16(&buf[DESCRIPTOR_LENGTH_BYTE_OFFSET]) & 0x0FFF);

                CHECK( byteOffset <= TS_PSI_MAX_BYTE_OFFSET(buf) );
        }

        return byteOffset;
}


uint8_t PSIP_EIT_getNumEvents( const uint8_t *buf )
{
        return buf[PSIP_TABLE_DATA_OFFSET];
}

BERR_Code PSIP_EIT_getEvent( const uint8_t *buf, int eventNum, PSIP_EIT_event *p_event )
{
        int byteOffset;

        if( eventNum >= buf[PSIP_TABLE_DATA_OFFSET] )
        {
                return BERR_INVALID_PARAMETER;
        }

        byteOffset = PSIP_EIT_P_getEventByteOffset( buf, eventNum );

        p_event->event_id = (uint16_t)(TS_READ_16( &buf[byteOffset] ) & 0x3FFF);
        p_event->start_time = TS_READ_32( &buf[byteOffset+2] );
        p_event->ETM_location = (buf[byteOffset+6]>>4)&3;
        p_event->length_in_seconds = (TS_READ_32(&buf[byteOffset+6])>>8)&0x000FFFFF;
        p_event->p_title_text = &buf[TITLE_LENGTH_BYTE_OFFSET+1];

        return BERR_SUCCESS;
}

TS_PSI_descriptor PSIP_EIT_getEventDescriptor( const uint8_t *buf, int eventNum, int descriptorNum )
{
        int byteOffset;

        if( eventNum >= buf[PSIP_TABLE_DATA_OFFSET] )
        {
                return NULL;
        }

        byteOffset = PSIP_EIT_P_getEventByteOffset( buf, eventNum );

        return TS_P_getDescriptor( &buf[DESCRIPTOR_LENGTH_BYTE_OFFSET+2], (TS_READ_16(&buf[DESCRIPTOR_LENGTH_BYTE_OFFSET]) & 0xFFF), descriptorNum );
}