1 /*****************************************************************************
2 * stream_memory.c: stream_t wrapper around memory buffer
3 *****************************************************************************
4 * Copyright (C) 1999-2008 VLC authors and VideoLAN
7 * Authors: Sigmund Augdal Helberg <dnumgis@videolan.org>
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU Lesser General Public License as published by
11 * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public License
20 * along with this program; if not, write to the Free Software Foundation,
21 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
32 bool i_preserve_memory;
33 uint64_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 * );
44 #undef stream_MemoryNew
46 * Create a stream from a memory buffer
48 * \param p_this the calling vlc_object
49 * \param p_buffer the memory buffer for the stream
50 * \param i_buffer the size of the buffer
51 * \param i_preserve_memory if this is set to false the memory buffer
52 * pointed to by p_buffer is freed on stream_Destroy
54 stream_t *stream_MemoryNew( vlc_object_t *p_this, uint8_t *p_buffer,
55 uint64_t i_size, bool i_preserve_memory )
57 stream_t *s = stream_CommonNew( p_this );
63 s->psz_path = strdup( "" ); /* N/A */
64 s->p_sys = p_sys = malloc( sizeof( stream_sys_t ) );
65 if( !s->psz_path || !s->p_sys )
67 stream_CommonDelete( s );
71 p_sys->i_size = i_size;
72 p_sys->p_buffer = p_buffer;
73 p_sys->i_preserve_memory = i_preserve_memory;
77 s->pf_control = Control;
78 s->pf_destroy = Delete;
84 static void Delete( stream_t *s )
86 if( !s->p_sys->i_preserve_memory ) free( s->p_sys->p_buffer );
88 stream_CommonDelete( s );
91 /****************************************************************************
93 ****************************************************************************/
94 static int Control( stream_t *s, int i_query, va_list args )
96 stream_sys_t *p_sys = s->p_sys;
98 uint64_t *pi_64, i_64;
102 case STREAM_GET_SIZE:
103 pi_64 = va_arg( args, uint64_t * );
104 *pi_64 = p_sys->i_size;
107 case STREAM_CAN_SEEK:
108 case STREAM_CAN_FASTSEEK:
109 case STREAM_CAN_PAUSE:
110 case STREAM_CAN_CONTROL_PACE:
111 *va_arg( args, bool * ) = true;
114 case STREAM_GET_POSITION:
115 pi_64 = va_arg( args, uint64_t * );
116 *pi_64 = p_sys->i_pos;
119 case STREAM_SET_POSITION:
120 i_64 = va_arg( args, uint64_t );
121 i_64 = __MIN( i_64, s->p_sys->i_size );
125 case STREAM_GET_PTS_DELAY:
126 *va_arg( args, int64_t * ) = 0;
129 case STREAM_GET_TITLE_INFO:
130 case STREAM_GET_TITLE:
131 case STREAM_GET_SEEKPOINT:
132 case STREAM_GET_META:
133 case STREAM_GET_CONTENT_TYPE:
134 case STREAM_GET_SIGNAL:
135 case STREAM_SET_TITLE:
136 case STREAM_SET_SEEKPOINT:
139 case STREAM_SET_PAUSE_STATE:
140 break; /* nothing to do */
142 case STREAM_SET_PRIVATE_ID_STATE:
143 case STREAM_SET_PRIVATE_ID_CA:
144 case STREAM_GET_PRIVATE_ID_STATE:
145 msg_Err( s, "Hey, what are you thinking? "
146 "DO NOT USE PRIVATE STREAM CONTROLS!!!" );
150 msg_Err( s, "invalid stream_vaControl query=0x%x", i_query );
156 static int Read( stream_t *s, void *p_read, unsigned int i_read )
158 stream_sys_t *p_sys = s->p_sys;
159 int i_res = __MIN( i_read, p_sys->i_size - p_sys->i_pos );
160 memcpy( p_read, p_sys->p_buffer + p_sys->i_pos, i_res );
161 p_sys->i_pos += i_res;
165 static int Peek( stream_t *s, const uint8_t **pp_peek, unsigned int i_read )
167 stream_sys_t *p_sys = s->p_sys;
168 int i_res = __MIN( i_read, p_sys->i_size - p_sys->i_pos );
169 *pp_peek = p_sys->p_buffer + p_sys->i_pos;