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