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/*****************************************************************************
* packetizer.h: Packetizer helpers
*****************************************************************************
* Copyright (C) 2009 Laurent Aimar
* $Id: b46b4657fcfb1fe16f15aaf4f861bffaa375b5cb $
*
* Authors: Laurent Aimar <fenrir _AT_ videolan _DOT_ org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
#ifndef _PACKETIZER_H
#define _PACKETIZER_H 1
#include <vlc_block.h>
enum
{
STATE_NOSYNC,
STATE_NEXT_SYNC
};
typedef void (*packetizer_reset_t)( void *p_private, bool b_broken );
typedef block_t *(*packetizer_parse_t)( void *p_private, bool *pb_ts_used, block_t * );
typedef int (*packetizer_validate_t)( void *p_private, block_t * );
typedef struct
{
int i_state;
block_bytestream_t bytestream;
size_t i_offset;
bool b_flushing;
int i_startcode;
const uint8_t *p_startcode;
int i_au_prepend;
const uint8_t *p_au_prepend;
unsigned i_au_min_size;
void *p_private;
packetizer_reset_t pf_reset;
packetizer_parse_t pf_parse;
packetizer_validate_t pf_validate;
} packetizer_t;
static inline void packetizer_Init( packetizer_t *p_pack,
const uint8_t *p_startcode, int i_startcode,
const uint8_t *p_au_prepend, int i_au_prepend,
unsigned i_au_min_size,
packetizer_reset_t pf_reset,
packetizer_parse_t pf_parse,
packetizer_validate_t pf_validate,
void *p_private )
{
p_pack->i_state = STATE_NOSYNC;
p_pack->bytestream = block_BytestreamInit();
p_pack->i_offset = 0;
p_pack->b_flushing = false;
p_pack->i_au_prepend = i_au_prepend;
p_pack->p_au_prepend = p_au_prepend;
p_pack->i_au_min_size = i_au_min_size;
p_pack->i_startcode = i_startcode;
p_pack->p_startcode = p_startcode;
p_pack->pf_reset = pf_reset;
p_pack->pf_parse = pf_parse;
p_pack->pf_validate = pf_validate;
p_pack->p_private = p_private;
}
static inline void packetizer_Clean( packetizer_t *p_pack )
{
block_BytestreamRelease( &p_pack->bytestream );
}
static inline block_t *packetizer_Packetize( packetizer_t *p_pack, block_t **pp_block )
{
if( !pp_block || !*pp_block )
return NULL;
if( (*pp_block)->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
{
const bool b_broken = ( (*pp_block)->i_flags&BLOCK_FLAG_CORRUPTED ) != 0;
if( b_broken )
{
p_pack->i_state = STATE_NOSYNC;
block_BytestreamEmpty( &p_pack->bytestream );
p_pack->i_offset = 0;
}
p_pack->pf_reset( p_pack->p_private, b_broken );
block_Release( *pp_block );
return NULL;
}
block_BytestreamPush( &p_pack->bytestream, *pp_block );
for( ;; )
{
bool b_used_ts;
block_t *p_pic;
switch( p_pack->i_state )
{
case STATE_NOSYNC:
/* Find a startcode */
if( !block_FindStartcodeFromOffset( &p_pack->bytestream, &p_pack->i_offset,
p_pack->p_startcode, p_pack->i_startcode ) )
p_pack->i_state = STATE_NEXT_SYNC;
if( p_pack->i_offset )
{
block_SkipBytes( &p_pack->bytestream, p_pack->i_offset );
p_pack->i_offset = 0;
block_BytestreamFlush( &p_pack->bytestream );
}
if( p_pack->i_state != STATE_NEXT_SYNC )
return NULL; /* Need more data */
p_pack->i_offset = 1; /* To find next startcode */
case STATE_NEXT_SYNC:
/* Find the next startcode */
if( block_FindStartcodeFromOffset( &p_pack->bytestream, &p_pack->i_offset,
p_pack->p_startcode, p_pack->i_startcode ) )
{
if( !p_pack->b_flushing || !p_pack->bytestream.p_chain )
return NULL; /* Need more data */
/* When flusing and we don't find a startcode, suppose that
* the data extend up to the end */
block_ChainProperties( p_pack->bytestream.p_chain,
NULL, &p_pack->i_offset, NULL );
p_pack->i_offset -= p_pack->bytestream .i_offset;
if( p_pack->i_offset <= (size_t)p_pack->i_startcode )
return NULL;
}
block_BytestreamFlush( &p_pack->bytestream );
/* Get the new fragment and set the pts/dts */
block_t *p_block_bytestream = p_pack->bytestream.p_block;
p_pic = block_New( p_dec, p_pack->i_offset + p_pack->i_au_prepend );
p_pic->i_pts = p_block_bytestream->i_pts;
p_pic->i_dts = p_block_bytestream->i_dts;
block_GetBytes( &p_pack->bytestream, &p_pic->p_buffer[p_pack->i_au_prepend],
p_pic->i_buffer - p_pack->i_au_prepend );
if( p_pack->i_au_prepend > 0 )
memcpy( p_pic->p_buffer, p_pack->p_au_prepend, p_pack->i_au_prepend );
p_pack->i_offset = 0;
/* Parse the NAL */
if( p_pic->i_buffer < p_pack->i_au_min_size )
{
block_Release( p_pic );
p_pic = NULL;
}
else
{
p_pic = p_pack->pf_parse( p_pack->p_private, &b_used_ts, p_pic );
if( b_used_ts )
{
p_block_bytestream->i_dts = VLC_TS_INVALID;
p_block_bytestream->i_pts = VLC_TS_INVALID;
}
}
if( !p_pic )
{
p_pack->i_state = STATE_NOSYNC;
break;
}
if( p_pack->pf_validate( p_pack->p_private, p_pic ) )
{
p_pack->i_state = STATE_NOSYNC;
block_Release( p_pic );
break;
}
/* So p_block doesn't get re-added several times */
*pp_block = block_BytestreamPop( &p_pack->bytestream );
p_pack->i_state = STATE_NOSYNC;
return p_pic;
}
}
}
static inline void packetizer_Header( packetizer_t *p_pack,
const uint8_t *p_header, int i_header )
{
block_t *p_init = block_Alloc( i_header );
if( !p_init )
return;
memcpy( p_init->p_buffer, p_header, i_header );
p_pack->b_flushing = true;
block_t *p_pic;
while( ( p_pic = packetizer_Packetize( p_pack, &p_init ) ) )
block_Release( p_pic ); /* Should not happen (only sequence header) */
p_pack->i_state = STATE_NOSYNC;
block_BytestreamEmpty( &p_pack->bytestream );
p_pack->i_offset = 0;
p_pack->b_flushing = false;
}
#endif
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