1 /*****************************************************************************
2 * stream_memory.c: stream_t wrapper around memory buffer
3 *****************************************************************************
4 * Copyright (C) 1999-2008 the VideoLAN team
7 * Authors: Sigmund Augdal Helberg <dnumgis@videolan.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 *****************************************************************************/
32 bool i_preserve_memory;
33 int64_t i_pos; /* Current reading offset */
39 static int Read ( stream_t *, void *p_read, unsigned int i_read );
40 static int Peek ( stream_t *, const uint8_t **pp_peek, unsigned int i_read );
41 static int Control( stream_t *, int i_query, va_list );
42 static void Delete ( stream_t * );
45 * Create a stream from a memory buffer
47 * \param p_this the calling vlc_object
48 * \param p_buffer the memory buffer for the stream
49 * \param i_buffer the size of the buffer
50 * \param i_preserve_memory if this is set to false the memory buffer
51 * pointed to by p_buffer is freed on stream_Destroy
53 stream_t *__stream_MemoryNew( vlc_object_t *p_this, uint8_t *p_buffer,
54 int64_t i_size, bool i_preserve_memory )
56 stream_t *s = stream_CommonNew( p_this );
62 s->psz_path = strdup( "" ); /* N/A */
63 s->p_sys = p_sys = malloc( sizeof( stream_sys_t ) );
64 if( !s->psz_path || !s->p_sys )
66 stream_CommonDelete( s );
70 p_sys->i_size = i_size;
71 p_sys->p_buffer = p_buffer;
72 p_sys->i_preserve_memory = i_preserve_memory;
76 s->pf_control = Control;
77 s->pf_destroy = Delete;
79 vlc_object_attach( s, p_this );
84 static void Delete( stream_t *s )
86 if( !s->p_sys->i_preserve_memory ) free( s->p_sys->p_buffer );
88 vlc_object_detach( s );
89 stream_CommonDelete( s );
92 /****************************************************************************
94 ****************************************************************************/
95 static int Control( stream_t *s, int i_query, va_list args )
97 stream_sys_t *p_sys = s->p_sys;
100 int64_t *pi_64, i_64;
105 case STREAM_GET_SIZE:
106 pi_64 = (int64_t*)va_arg( args, int64_t * );
107 *pi_64 = p_sys->i_size;
110 case STREAM_CAN_SEEK:
111 p_bool = (bool*)va_arg( args, bool * );
115 case STREAM_CAN_FASTSEEK:
116 p_bool = (bool*)va_arg( args, bool * );
120 case STREAM_GET_POSITION:
121 pi_64 = (int64_t*)va_arg( args, int64_t * );
122 *pi_64 = p_sys->i_pos;
125 case STREAM_SET_POSITION:
126 i_64 = (int64_t)va_arg( args, int64_t );
127 i_64 = __MAX( i_64, 0 );
128 i_64 = __MIN( i_64, s->p_sys->i_size );
132 case STREAM_GET_CONTENT_TYPE:
135 case STREAM_CONTROL_ACCESS:
136 i_int = (int) va_arg( args, int );
137 msg_Err( s, "Hey, what are you thinking ?"
138 "DON'T USE STREAM_CONTROL_ACCESS !!!" );
142 msg_Err( s, "invalid stream_vaControl query=0x%x", i_query );
148 static int Read( stream_t *s, void *p_read, unsigned int i_read )
150 stream_sys_t *p_sys = s->p_sys;
151 int i_res = __MIN( i_read, p_sys->i_size - p_sys->i_pos );
152 memcpy( p_read, p_sys->p_buffer + p_sys->i_pos, i_res );
153 p_sys->i_pos += i_res;
157 static int Peek( stream_t *s, const uint8_t **pp_peek, unsigned int i_read )
159 stream_sys_t *p_sys = s->p_sys;
160 int i_res = __MIN( i_read, p_sys->i_size - p_sys->i_pos );
161 *pp_peek = p_sys->p_buffer + p_sys->i_pos;