1 /*****************************************************************************
2 * packetizer.h: Packetizer helpers
3 *****************************************************************************
4 * Copyright (C) 2009 Laurent Aimar
7 * Authors: Laurent Aimar <fenrir _AT_ videolan _DOT_ org>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
25 #define _PACKETIZER_H 1
27 #include <vlc_block.h>
35 typedef void (*packetizer_reset_t)( void *p_private, bool b_broken );
36 typedef block_t *(*packetizer_parse_t)( void *p_private, bool *pb_ts_used, block_t * );
37 typedef int (*packetizer_validate_t)( void *p_private, block_t * );
42 block_bytestream_t bytestream;
46 const uint8_t *p_startcode;
49 const uint8_t *p_au_prepend;
52 packetizer_reset_t pf_reset;
53 packetizer_parse_t pf_parse;
54 packetizer_validate_t pf_validate;
58 static inline void packetizer_Init( packetizer_t *p_pack,
59 const uint8_t *p_startcode, int i_startcode,
60 const uint8_t *p_au_prepend, int i_au_prepend,
61 packetizer_reset_t pf_reset,
62 packetizer_parse_t pf_parse,
63 packetizer_validate_t pf_validate,
66 p_pack->i_state = STATE_NOSYNC;
67 p_pack->bytestream = block_BytestreamInit();
70 p_pack->i_au_prepend = i_au_prepend;
71 p_pack->p_au_prepend = p_au_prepend;
73 p_pack->i_startcode = i_startcode;
74 p_pack->p_startcode = p_startcode;
75 p_pack->pf_reset = pf_reset;
76 p_pack->pf_parse = pf_parse;
77 p_pack->pf_validate = pf_validate;
78 p_pack->p_private = p_private;
81 static inline void packetizer_Clean( packetizer_t *p_pack )
83 block_BytestreamRelease( &p_pack->bytestream );
86 static inline block_t *packetizer_Packetize( packetizer_t *p_pack, block_t **pp_block )
88 if( !pp_block || !*pp_block )
91 if( (*pp_block)->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
93 const bool b_broken = ( (*pp_block)->i_flags&BLOCK_FLAG_CORRUPTED ) != 0;
96 p_pack->i_state = STATE_NOSYNC;
97 block_BytestreamEmpty( &p_pack->bytestream );
100 p_pack->pf_reset( p_pack->p_private, b_broken );
102 block_Release( *pp_block );
106 block_BytestreamPush( &p_pack->bytestream, *pp_block );
113 switch( p_pack->i_state )
116 /* Find a startcode */
117 if( !block_FindStartcodeFromOffset( &p_pack->bytestream, &p_pack->i_offset,
118 p_pack->p_startcode, p_pack->i_startcode ) )
119 p_pack->i_state = STATE_NEXT_SYNC;
121 if( p_pack->i_offset )
123 block_SkipBytes( &p_pack->bytestream, p_pack->i_offset );
124 p_pack->i_offset = 0;
125 block_BytestreamFlush( &p_pack->bytestream );
128 if( p_pack->i_state != STATE_NEXT_SYNC )
129 return NULL; /* Need more data */
131 p_pack->i_offset = 1; /* To find next startcode */
133 case STATE_NEXT_SYNC:
134 /* Find the next startcode */
135 if( block_FindStartcodeFromOffset( &p_pack->bytestream, &p_pack->i_offset,
136 p_pack->p_startcode, p_pack->i_startcode ) )
137 return NULL; /* Need more data */
139 block_BytestreamFlush( &p_pack->bytestream );
141 /* Get the new fragment and set the pts/dts */
142 block_t *p_block_bytestream = p_pack->bytestream.p_block;
144 p_pic = block_New( p_dec, p_pack->i_offset + p_pack->i_au_prepend );
145 p_pic->i_pts = p_block_bytestream->i_pts;
146 p_pic->i_dts = p_block_bytestream->i_dts;
148 block_GetBytes( &p_pack->bytestream, &p_pic->p_buffer[p_pack->i_au_prepend],
149 p_pic->i_buffer - p_pack->i_au_prepend );
150 if( p_pack->i_au_prepend > 0 )
151 memcpy( p_pic->p_buffer, p_pack->p_au_prepend, p_pack->i_au_prepend );
153 p_pack->i_offset = 0;
156 p_pic = p_pack->pf_parse( p_pack->p_private, &b_used_ts, p_pic );
159 p_block_bytestream->i_dts = -1;
160 p_block_bytestream->i_pts = -1;
165 p_pack->i_state = STATE_NOSYNC;
168 if( p_pack->pf_validate( p_pack->p_private, p_pic ) )
170 p_pack->i_state = STATE_NOSYNC;
171 block_Release( p_pic );
175 /* So p_block doesn't get re-added several times */
176 *pp_block = block_BytestreamPop( &p_pack->bytestream );
178 p_pack->i_state = STATE_NOSYNC;
185 static inline void packetizer_Header( packetizer_t *p_pack,
186 const uint8_t *p_header, int i_header )
188 block_t *p_init = block_Alloc( i_header );
192 memcpy( p_init->p_buffer, p_header, i_header );
195 while( ( p_pic = packetizer_Packetize( p_pack, &p_init ) ) )
196 block_Release( p_pic ); /* Should not happen (only sequence header) */