+/*****************************************************************************
+ * packetizer.h: Packetizer helpers
+ *****************************************************************************
+ * Copyright (C) 2009 Laurent Aimar
+ * $Id$
+ *
+ * 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;
+
+ int i_startcode;
+ const uint8_t *p_startcode;
+
+ int i_au_prepend;
+ const uint8_t *p_au_prepend;
+
+ 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,
+ 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->i_au_prepend = i_au_prepend;
+ p_pack->p_au_prepend = p_au_prepend;
+
+ 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 ) )
+ return NULL; /* Need more data */
+
+ 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 */
+ p_pic = p_pack->pf_parse( p_pack->p_private, &b_used_ts, p_pic );
+ if( b_used_ts )
+ {
+ p_block_bytestream->i_dts = -1;
+ p_block_bytestream->i_pts = -1;
+ }
+
+ 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;
+ }
+ }
+}
+
+#endif
+