1 /*****************************************************************************
2 * block.c: Data blocks management functions
3 *****************************************************************************
4 * Copyright (C) 2003-2004 the VideoLAN team
7 * Authors: Laurent Aimar <fenrir@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 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
28 #include "vlc_block.h"
30 /*****************************************************************************
32 *****************************************************************************/
37 size_t i_allocated_buffer;
38 uint8_t p_allocated_buffer[0];
41 #define BLOCK_PADDING_SIZE 32
42 static void BlockRelease( block_t * );
44 block_t *__block_New( vlc_object_t *p_obj, size_t i_size )
46 /* We do only one malloc
47 * TODO bench if doing 2 malloc but keeping a pool of buffer is better
49 * 2 * BLOCK_PADDING_SIZE -> pre + post padding
51 const size_t i_alloc = i_size + 2 * BLOCK_PADDING_SIZE + 16;
52 block_sys_t *p_sys = malloc( sizeof( *p_sys ) + i_alloc );
57 /* Fill opaque data */
58 p_sys->i_allocated_buffer = i_alloc;
61 p_sys->self.p_next = NULL;
62 p_sys->self.p_prev = NULL;
63 p_sys->self.i_flags = 0;
64 p_sys->self.i_pts = 0;
65 p_sys->self.i_dts = 0;
66 p_sys->self.i_length = 0;
67 p_sys->self.i_rate = 0;
68 p_sys->self.i_buffer = i_size;
69 p_sys->self.p_buffer =
70 &p_sys->p_allocated_buffer[BLOCK_PADDING_SIZE +
71 16 - ((uintptr_t)p_sys->p_allocated_buffer % 16 )];
72 p_sys->self.pf_release = BlockRelease;
77 block_t *block_Realloc( block_t *p_block, ssize_t i_prebody, size_t i_body )
79 block_sys_t *p_sys = (block_sys_t *)p_block;
80 ssize_t i_buffer_size;
82 if( p_block->pf_release != BlockRelease )
84 /* Special case when pf_release if overloaded
85 * TODO if used one day, them implement it in a smarter way */
86 block_t *p_dup = block_Duplicate( p_block );
87 block_Release( p_block );
94 i_buffer_size = i_prebody + i_body;
96 if( i_buffer_size <= 0 )
98 block_Release( p_block );
102 if( p_block->p_buffer - i_prebody > p_sys->p_allocated_buffer &&
103 p_block->p_buffer - i_prebody < p_sys->p_allocated_buffer +
104 p_sys->i_allocated_buffer )
106 p_block->p_buffer -= i_prebody;
107 p_block->i_buffer += i_prebody;
110 if( p_block->p_buffer + i_body < p_sys->p_allocated_buffer +
111 p_sys->i_allocated_buffer )
113 p_block->i_buffer = i_buffer_size;
117 if( i_body > 0 || i_prebody > 0 )
119 block_t *p_rea = block_New( NULL, i_buffer_size );
123 p_rea->i_dts = p_block->i_dts;
124 p_rea->i_pts = p_block->i_pts;
125 p_rea->i_flags = p_block->i_flags;
126 p_rea->i_length = p_block->i_length;
127 p_rea->i_rate = p_block->i_rate;
128 p_rea->i_samples = p_block->i_samples;
130 memcpy( p_rea->p_buffer + i_prebody, p_block->p_buffer,
131 __MIN( p_block->i_buffer, p_rea->i_buffer - i_prebody ) );
134 block_Release( p_block );
142 static void BlockRelease( block_t *p_block )
148 /*****************************************************************************
149 * block_fifo_t management
150 *****************************************************************************/
153 vlc_mutex_t lock; /* fifo data lock */
154 vlc_cond_t wait; /* fifo data conditional variable */
160 vlc_bool_t b_force_wake;
163 block_fifo_t *__block_FifoNew( vlc_object_t *p_obj )
165 block_fifo_t *p_fifo;
167 p_fifo = malloc( sizeof( block_fifo_t ) );
168 if( !p_fifo ) return NULL;
169 vlc_mutex_init( p_obj, &p_fifo->lock );
170 vlc_cond_init( p_obj, &p_fifo->wait );
171 p_fifo->p_first = NULL;
172 p_fifo->pp_last = &p_fifo->p_first;
173 p_fifo->i_depth = p_fifo->i_size = 0;
174 p_fifo->b_force_wake = VLC_FALSE;
179 void block_FifoRelease( block_fifo_t *p_fifo )
181 block_FifoEmpty( p_fifo );
182 vlc_cond_destroy( &p_fifo->wait );
183 vlc_mutex_destroy( &p_fifo->lock );
187 void block_FifoEmpty( block_fifo_t *p_fifo )
191 vlc_mutex_lock( &p_fifo->lock );
192 for( b = p_fifo->p_first; b != NULL; )
201 p_fifo->i_depth = p_fifo->i_size = 0;
202 p_fifo->p_first = NULL;
203 p_fifo->pp_last = &p_fifo->p_first;
204 vlc_mutex_unlock( &p_fifo->lock );
207 size_t block_FifoPut( block_fifo_t *p_fifo, block_t *p_block )
210 vlc_mutex_lock( &p_fifo->lock );
214 i_size += p_block->i_buffer;
216 *p_fifo->pp_last = p_block;
217 p_fifo->pp_last = &p_block->p_next;
219 p_fifo->i_size += p_block->i_buffer;
221 p_block = p_block->p_next;
225 /* warn there is data in this fifo */
226 vlc_cond_signal( &p_fifo->wait );
227 vlc_mutex_unlock( &p_fifo->lock );
232 void block_FifoWake( block_fifo_t *p_fifo )
234 vlc_mutex_lock( &p_fifo->lock );
235 if( p_fifo->p_first == NULL )
236 p_fifo->b_force_wake = VLC_TRUE;
237 vlc_cond_signal( &p_fifo->wait );
238 vlc_mutex_unlock( &p_fifo->lock );
241 block_t *block_FifoGet( block_fifo_t *p_fifo )
245 vlc_mutex_lock( &p_fifo->lock );
247 /* Remember vlc_cond_wait() may cause spurious wakeups
248 * (on both Win32 and POSIX) */
249 while( ( p_fifo->p_first == NULL ) && !p_fifo->b_force_wake )
251 vlc_cond_wait( &p_fifo->wait, &p_fifo->lock );
256 p_fifo->b_force_wake = VLC_FALSE;
260 vlc_mutex_unlock( &p_fifo->lock );
264 p_fifo->p_first = b->p_next;
266 p_fifo->i_size -= b->i_buffer;
268 if( p_fifo->p_first == NULL )
270 p_fifo->pp_last = &p_fifo->p_first;
273 vlc_mutex_unlock( &p_fifo->lock );
279 block_t *block_FifoShow( block_fifo_t *p_fifo )
283 vlc_mutex_lock( &p_fifo->lock );
285 if( p_fifo->p_first == NULL )
287 vlc_cond_wait( &p_fifo->wait, &p_fifo->lock );
292 vlc_mutex_unlock( &p_fifo->lock );
297 size_t block_FifoSize( const block_fifo_t *p_fifo )
299 return p_fifo->i_size;
302 size_t block_FifoCount( const block_fifo_t *p_fifo )
304 return p_fifo->i_depth;