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];
42 static void BlockNoRelease( block_t *b )
44 fprintf( stderr, "block %p has no release callback! This is a bug!\n", b );
49 void block_Init( block_t *restrict b, void *buf, size_t size )
51 /* Fill all fields to their default */
52 b->p_next = b->p_prev = NULL;
54 b->i_pts = b->i_dts = b->i_length = 0;
59 b->pf_release = BlockNoRelease;
63 static void BlockRelease( block_t *p_block )
68 #define BLOCK_PADDING_SIZE 32
70 block_t *block_Alloc( size_t i_size )
72 /* We do only one malloc
73 * TODO bench if doing 2 malloc but keeping a pool of buffer is better
75 * 2 * BLOCK_PADDING_SIZE -> pre + post padding
77 const size_t i_alloc = i_size + 2 * BLOCK_PADDING_SIZE + 16;
78 block_sys_t *p_sys = malloc( sizeof( *p_sys ) + i_alloc );
83 /* Fill opaque data */
84 p_sys->i_allocated_buffer = i_alloc;
86 block_Init( &p_sys->self, p_sys->p_allocated_buffer + BLOCK_PADDING_SIZE
87 + 16 - ((uintptr_t)p_sys->p_allocated_buffer % 16 ), i_size );
88 p_sys->self.pf_release = BlockRelease;
93 block_t *block_Realloc( block_t *p_block, ssize_t i_prebody, size_t i_body )
95 block_sys_t *p_sys = (block_sys_t *)p_block;
96 ssize_t i_buffer_size;
98 if( p_block->pf_release != BlockRelease )
100 /* Special case when pf_release if overloaded
101 * TODO if used one day, them implement it in a smarter way */
102 block_t *p_dup = block_Duplicate( p_block );
103 block_Release( p_block );
110 i_buffer_size = i_prebody + i_body;
112 if( i_buffer_size <= 0 )
114 block_Release( p_block );
118 if( p_block->p_buffer - i_prebody > p_sys->p_allocated_buffer &&
119 p_block->p_buffer - i_prebody < p_sys->p_allocated_buffer +
120 p_sys->i_allocated_buffer )
122 p_block->p_buffer -= i_prebody;
123 p_block->i_buffer += i_prebody;
126 if( p_block->p_buffer + i_body < p_sys->p_allocated_buffer +
127 p_sys->i_allocated_buffer )
129 p_block->i_buffer = i_buffer_size;
133 if( i_body > 0 || i_prebody > 0 )
135 block_t *p_rea = block_New( NULL, i_buffer_size );
139 p_rea->i_dts = p_block->i_dts;
140 p_rea->i_pts = p_block->i_pts;
141 p_rea->i_flags = p_block->i_flags;
142 p_rea->i_length = p_block->i_length;
143 p_rea->i_rate = p_block->i_rate;
144 p_rea->i_samples = p_block->i_samples;
146 memcpy( p_rea->p_buffer + i_prebody, p_block->p_buffer,
147 __MIN( p_block->i_buffer, p_rea->i_buffer - i_prebody ) );
150 block_Release( p_block );
158 /*****************************************************************************
159 * block_fifo_t management
160 *****************************************************************************/
163 vlc_mutex_t lock; /* fifo data lock */
164 vlc_cond_t wait; /* fifo data conditional variable */
170 vlc_bool_t b_force_wake;
173 block_fifo_t *__block_FifoNew( vlc_object_t *p_obj )
175 block_fifo_t *p_fifo;
177 p_fifo = malloc( sizeof( block_fifo_t ) );
178 if( !p_fifo ) return NULL;
179 vlc_mutex_init( p_obj, &p_fifo->lock );
180 vlc_cond_init( p_obj, &p_fifo->wait );
181 p_fifo->p_first = NULL;
182 p_fifo->pp_last = &p_fifo->p_first;
183 p_fifo->i_depth = p_fifo->i_size = 0;
184 p_fifo->b_force_wake = VLC_FALSE;
189 void block_FifoRelease( block_fifo_t *p_fifo )
191 block_FifoEmpty( p_fifo );
192 vlc_cond_destroy( &p_fifo->wait );
193 vlc_mutex_destroy( &p_fifo->lock );
197 void block_FifoEmpty( block_fifo_t *p_fifo )
201 vlc_mutex_lock( &p_fifo->lock );
202 for( b = p_fifo->p_first; b != NULL; )
211 p_fifo->i_depth = p_fifo->i_size = 0;
212 p_fifo->p_first = NULL;
213 p_fifo->pp_last = &p_fifo->p_first;
214 vlc_mutex_unlock( &p_fifo->lock );
217 size_t block_FifoPut( block_fifo_t *p_fifo, block_t *p_block )
220 vlc_mutex_lock( &p_fifo->lock );
224 i_size += p_block->i_buffer;
226 *p_fifo->pp_last = p_block;
227 p_fifo->pp_last = &p_block->p_next;
229 p_fifo->i_size += p_block->i_buffer;
231 p_block = p_block->p_next;
235 /* warn there is data in this fifo */
236 vlc_cond_signal( &p_fifo->wait );
237 vlc_mutex_unlock( &p_fifo->lock );
242 void block_FifoWake( block_fifo_t *p_fifo )
244 vlc_mutex_lock( &p_fifo->lock );
245 if( p_fifo->p_first == NULL )
246 p_fifo->b_force_wake = VLC_TRUE;
247 vlc_cond_signal( &p_fifo->wait );
248 vlc_mutex_unlock( &p_fifo->lock );
251 block_t *block_FifoGet( block_fifo_t *p_fifo )
255 vlc_mutex_lock( &p_fifo->lock );
257 /* Remember vlc_cond_wait() may cause spurious wakeups
258 * (on both Win32 and POSIX) */
259 while( ( p_fifo->p_first == NULL ) && !p_fifo->b_force_wake )
261 vlc_cond_wait( &p_fifo->wait, &p_fifo->lock );
266 p_fifo->b_force_wake = VLC_FALSE;
270 vlc_mutex_unlock( &p_fifo->lock );
274 p_fifo->p_first = b->p_next;
276 p_fifo->i_size -= b->i_buffer;
278 if( p_fifo->p_first == NULL )
280 p_fifo->pp_last = &p_fifo->p_first;
283 vlc_mutex_unlock( &p_fifo->lock );
289 block_t *block_FifoShow( block_fifo_t *p_fifo )
293 vlc_mutex_lock( &p_fifo->lock );
295 if( p_fifo->p_first == NULL )
297 vlc_cond_wait( &p_fifo->wait, &p_fifo->lock );
302 vlc_mutex_unlock( &p_fifo->lock );
307 size_t block_FifoSize( const block_fifo_t *p_fifo )
309 return p_fifo->i_size;
312 size_t block_FifoCount( const block_fifo_t *p_fifo )
314 return p_fifo->i_depth;