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 *****************************************************************************/
32 #include "vlc_block.h"
34 /*****************************************************************************
36 *****************************************************************************/
41 size_t i_allocated_buffer;
42 uint8_t p_allocated_buffer[0];
46 static void BlockNoRelease( block_t *b )
48 fprintf( stderr, "block %p has no release callback! This is a bug!\n", b );
53 void block_Init( block_t *restrict b, void *buf, size_t size )
55 /* Fill all fields to their default */
56 b->p_next = b->p_prev = NULL;
58 b->i_pts = b->i_dts = b->i_length = 0;
63 b->pf_release = BlockNoRelease;
67 static void BlockRelease( block_t *p_block )
72 #define BLOCK_PADDING_SIZE 32
74 block_t *block_Alloc( size_t i_size )
76 /* We do only one malloc
77 * TODO bench if doing 2 malloc but keeping a pool of buffer is better
79 * 2 * BLOCK_PADDING_SIZE -> pre + post padding
81 const size_t i_alloc = i_size + 2 * BLOCK_PADDING_SIZE + 16;
82 block_sys_t *p_sys = malloc( sizeof( *p_sys ) + i_alloc );
87 /* Fill opaque data */
88 p_sys->i_allocated_buffer = i_alloc;
90 block_Init( &p_sys->self, p_sys->p_allocated_buffer + BLOCK_PADDING_SIZE
91 + 16 - ((uintptr_t)p_sys->p_allocated_buffer % 16 ), i_size );
92 p_sys->self.pf_release = BlockRelease;
97 block_t *block_Realloc( block_t *p_block, ssize_t i_prebody, size_t i_body )
99 block_sys_t *p_sys = (block_sys_t *)p_block;
100 ssize_t i_buffer_size;
102 if( p_block->pf_release != BlockRelease )
104 /* Special case when pf_release if overloaded
105 * TODO if used one day, them implement it in a smarter way */
106 block_t *p_dup = block_Duplicate( p_block );
107 block_Release( p_block );
114 i_buffer_size = i_prebody + i_body;
116 if( i_buffer_size <= 0 )
118 block_Release( p_block );
122 if( p_block->p_buffer - i_prebody > p_sys->p_allocated_buffer &&
123 p_block->p_buffer - i_prebody < p_sys->p_allocated_buffer +
124 p_sys->i_allocated_buffer )
126 p_block->p_buffer -= i_prebody;
127 p_block->i_buffer += i_prebody;
130 if( p_block->p_buffer + i_body < p_sys->p_allocated_buffer +
131 p_sys->i_allocated_buffer )
133 p_block->i_buffer = i_buffer_size;
137 if( i_body > 0 || i_prebody > 0 )
139 block_t *p_rea = block_New( NULL, i_buffer_size );
143 p_rea->i_dts = p_block->i_dts;
144 p_rea->i_pts = p_block->i_pts;
145 p_rea->i_flags = p_block->i_flags;
146 p_rea->i_length = p_block->i_length;
147 p_rea->i_rate = p_block->i_rate;
148 p_rea->i_samples = p_block->i_samples;
150 memcpy( p_rea->p_buffer + i_prebody, p_block->p_buffer,
151 __MIN( p_block->i_buffer, p_rea->i_buffer - i_prebody ) );
154 block_Release( p_block );
163 # include <sys/mman.h>
165 typedef struct block_mmap_t
172 static void block_mmap_Release (block_t *block)
174 block_mmap_t *p_sys = (block_mmap_t *)block;
176 munmap (p_sys->base_addr, p_sys->length);
180 block_t *block_mmap_Alloc (void *addr, size_t length)
182 if (addr == MAP_FAILED)
185 block_mmap_t *block = malloc (sizeof (*block));
188 munmap (addr, length);
192 block_Init (&block->self, (uint8_t *)addr, length);
193 block->self.pf_release = block_mmap_Release;
194 block->base_addr = addr;
195 block->length = length;
200 /*****************************************************************************
201 * block_fifo_t management
202 *****************************************************************************/
205 vlc_mutex_t lock; /* fifo data lock */
206 vlc_cond_t wait; /* fifo data conditional variable */
212 vlc_bool_t b_force_wake;
215 block_fifo_t *__block_FifoNew( vlc_object_t *p_obj )
219 block_fifo_t *p_fifo;
221 p_fifo = malloc( sizeof( block_fifo_t ) );
222 if( !p_fifo ) return NULL;
223 vlc_mutex_init( p_obj, &p_fifo->lock );
224 vlc_cond_init( p_obj, &p_fifo->wait );
225 p_fifo->p_first = NULL;
226 p_fifo->pp_last = &p_fifo->p_first;
227 p_fifo->i_depth = p_fifo->i_size = 0;
228 p_fifo->b_force_wake = VLC_FALSE;
233 void block_FifoRelease( block_fifo_t *p_fifo )
235 block_FifoEmpty( p_fifo );
236 vlc_cond_destroy( &p_fifo->wait );
237 vlc_mutex_destroy( &p_fifo->lock );
241 void block_FifoEmpty( block_fifo_t *p_fifo )
245 vlc_mutex_lock( &p_fifo->lock );
246 for( b = p_fifo->p_first; b != NULL; )
255 p_fifo->i_depth = p_fifo->i_size = 0;
256 p_fifo->p_first = NULL;
257 p_fifo->pp_last = &p_fifo->p_first;
258 vlc_mutex_unlock( &p_fifo->lock );
261 size_t block_FifoPut( block_fifo_t *p_fifo, block_t *p_block )
264 vlc_mutex_lock( &p_fifo->lock );
268 i_size += p_block->i_buffer;
270 *p_fifo->pp_last = p_block;
271 p_fifo->pp_last = &p_block->p_next;
273 p_fifo->i_size += p_block->i_buffer;
275 p_block = p_block->p_next;
279 /* warn there is data in this fifo */
280 vlc_cond_signal( &p_fifo->wait );
281 vlc_mutex_unlock( &p_fifo->lock );
286 void block_FifoWake( block_fifo_t *p_fifo )
288 vlc_mutex_lock( &p_fifo->lock );
289 if( p_fifo->p_first == NULL )
290 p_fifo->b_force_wake = VLC_TRUE;
291 vlc_cond_signal( &p_fifo->wait );
292 vlc_mutex_unlock( &p_fifo->lock );
295 block_t *block_FifoGet( block_fifo_t *p_fifo )
299 vlc_mutex_lock( &p_fifo->lock );
301 /* Remember vlc_cond_wait() may cause spurious wakeups
302 * (on both Win32 and POSIX) */
303 while( ( p_fifo->p_first == NULL ) && !p_fifo->b_force_wake )
305 vlc_cond_wait( &p_fifo->wait, &p_fifo->lock );
310 p_fifo->b_force_wake = VLC_FALSE;
314 vlc_mutex_unlock( &p_fifo->lock );
318 p_fifo->p_first = b->p_next;
320 p_fifo->i_size -= b->i_buffer;
322 if( p_fifo->p_first == NULL )
324 p_fifo->pp_last = &p_fifo->p_first;
327 vlc_mutex_unlock( &p_fifo->lock );
333 block_t *block_FifoShow( block_fifo_t *p_fifo )
337 vlc_mutex_lock( &p_fifo->lock );
339 if( p_fifo->p_first == NULL )
341 vlc_cond_wait( &p_fifo->wait, &p_fifo->lock );
346 vlc_mutex_unlock( &p_fifo->lock );
351 size_t block_FifoSize( const block_fifo_t *p_fifo )
353 return p_fifo->i_size;
356 size_t block_FifoCount( const block_fifo_t *p_fifo )
358 return p_fifo->i_depth;