1 /*****************************************************************************
2 * vpar_pool.c : management of the pool of decoder threads
3 *****************************************************************************
4 * Copyright (C) 2001 VideoLAN
5 * $Id: vpar_pool.c,v 1.13 2002/07/31 20:56:52 sam Exp $
7 * Authors: Christophe Massiot <massiot@via.ecp.fr>
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., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
27 #include <string.h> /* memcpy(), memset() */
28 #include <stdlib.h> /* realloc() */
32 #include <vlc/decoder.h>
34 #include "vdec_ext-plugins.h"
35 #include "video_decoder.h"
36 #include "vpar_pool.h"
37 #include "video_parser.h"
42 static void WaitDummy( vdec_pool_t * p_pool );
43 static void WaitPool( vdec_pool_t * p_pool );
44 static void FreeMacroblockDummy( vdec_pool_t * p_pool, macroblock_t * p_mb );
45 static void FreeMacroblockPool( vdec_pool_t * p_pool, macroblock_t * p_mb );
46 static macroblock_t * NewMacroblockDummy( vdec_pool_t * p_pool );
47 static macroblock_t * NewMacroblockPool( vdec_pool_t * p_pool );
48 static void DecodeMacroblockDummy( vdec_pool_t * p_pool, macroblock_t * p_mb );
49 static void DecodeMacroblockPool( vdec_pool_t * p_pool, macroblock_t * p_mb );
51 /*****************************************************************************
52 * vpar_InitPool: Initializes the pool structure
53 *****************************************************************************/
54 void vpar_InitPool( vpar_thread_t * p_vpar )
58 /* Initialize mutex and cond. */
59 vlc_mutex_init( p_vpar->p_fifo, &p_vpar->pool.lock );
60 vlc_cond_init( p_vpar->p_fifo, &p_vpar->pool.wait_empty );
61 vlc_cond_init( p_vpar->p_fifo, &p_vpar->pool.wait_undecoded );
63 /* Spawn optional video decoder threads. */
64 p_vpar->pool.i_smp = 0;
65 p_vpar->pool.pp_vdec = NULL;
66 p_vpar->pool.p_macroblocks = NULL;
67 p_vpar->pool.pp_empty_macroblocks = NULL;
68 p_vpar->pool.pp_new_macroblocks = NULL;
69 p_vpar->pool.p_vpar = p_vpar;
70 vpar_SpawnPool( p_vpar );
72 /* Initialize fake video decoder structure (used when
73 * decoder == parser). */
74 p_vpar->pool.p_vdec = vlc_object_create( p_vpar->p_fifo,
75 sizeof(vdec_thread_t) );
76 if ( p_vpar->pool.p_vdec == NULL )
78 msg_Err( p_vpar->p_fifo, "out of memory" );
79 p_vpar->p_fifo->b_error = 1;
82 p_vpar->pool.p_vdec->p_pool = &p_vpar->pool;
83 vdec_InitThread( p_vpar->pool.p_vdec );
85 vlc_object_attach( p_vpar->pool.p_vdec, p_vpar->p_fifo );
87 for( j = 0; j < 12; j++ )
89 p_vpar->pool.mb.p_idcts[j].pi_block =
90 vlc_memalign( &p_vpar->pool.mb.p_idcts[j].pi_block_orig,
91 16, 64 * sizeof(dctelem_t) );
95 /*****************************************************************************
96 * vpar_SpawnPool: Create and cancel video decoder threads at any time
97 *****************************************************************************
98 * This function is called on startup, and everytime the user changes the
99 * number of threads to launch. Please note that *all* decoder threads must
100 * be idle during this operation, which only happens at the end of
102 *****************************************************************************/
103 void vpar_SpawnPool( vpar_thread_t * p_vpar )
106 stream_ctrl_t * p_control;
108 p_control = p_vpar->p_fifo->p_stream_ctrl;
109 vlc_mutex_lock( &p_control->control_lock );
110 i_new_smp = config_GetInt( p_vpar->p_fifo, "vdec-smp" );
111 vlc_mutex_unlock( &p_control->control_lock );
113 /* FIXME: No error check because I'm tired. Come back later... */
115 /* No need to lock p_vpar->pool, since decoders MUST be idle here. */
116 if( p_vpar->pool.i_smp != i_new_smp )
120 if( p_vpar->pool.i_smp > i_new_smp )
122 /* The user reduces the number of threads. */
124 for( i = p_vpar->pool.i_smp - 1; i >= i_new_smp; i-- )
128 vlc_object_detach_all( p_vpar->pool.pp_vdec[i] );
129 vdec_DestroyThread( p_vpar->pool.pp_vdec[i] );
131 for( j = 0; j < 12; j++ )
133 free( p_vpar->pool.p_macroblocks[i].p_idcts[j].pi_block_orig );
137 p_vpar->pool.pp_vdec = realloc( p_vpar->pool.pp_vdec,
138 i_new_smp * sizeof(vdec_thread_t *) );
139 p_vpar->pool.p_macroblocks = realloc( p_vpar->pool.p_macroblocks,
140 i_new_smp * sizeof(macroblock_t) );
141 p_vpar->pool.pp_empty_macroblocks = realloc( p_vpar->pool.pp_empty_macroblocks,
142 i_new_smp * sizeof(macroblock_t *) );
143 p_vpar->pool.i_index_empty = i_new_smp;
144 p_vpar->pool.pp_new_macroblocks = realloc( p_vpar->pool.pp_new_macroblocks,
145 i_new_smp * sizeof(macroblock_t *) );
146 p_vpar->pool.i_index_new = 0;
150 /* The user raises the number of threads. */
152 p_vpar->pool.pp_vdec = realloc( p_vpar->pool.pp_vdec,
153 i_new_smp * sizeof(vdec_thread_t *) );
154 p_vpar->pool.p_macroblocks = realloc( p_vpar->pool.p_macroblocks,
155 i_new_smp * sizeof(macroblock_t) );
156 p_vpar->pool.pp_empty_macroblocks = realloc( p_vpar->pool.pp_empty_macroblocks,
157 i_new_smp * sizeof(macroblock_t *) );
158 p_vpar->pool.i_index_empty = i_new_smp;
159 p_vpar->pool.pp_new_macroblocks = realloc( p_vpar->pool.pp_new_macroblocks,
160 i_new_smp * sizeof(macroblock_t *) );
161 p_vpar->pool.i_index_new = 0;
163 for( i = p_vpar->pool.i_smp; i < i_new_smp ; i++ )
167 for( j = 0; j < 12; j++ )
169 p_vpar->pool.p_macroblocks[i].p_idcts[j].pi_block =
170 vlc_memalign( &p_vpar->pool.p_macroblocks[i].p_idcts[j].pi_block_orig,
171 16, 64 * sizeof(dctelem_t) );
174 p_vpar->pool.pp_vdec[i] = vdec_CreateThread( &p_vpar->pool );
175 vlc_object_attach( p_vpar->pool.pp_vdec[i], p_vpar->p_fifo );
179 for( i = 0; i < i_new_smp; i++ )
181 p_vpar->pool.pp_empty_macroblocks[i] =
182 &p_vpar->pool.p_macroblocks[i];
184 p_vpar->pool.i_smp = i_new_smp;
189 /* We have at least one decoder thread. */
190 p_vpar->pool.pf_wait_pool = WaitPool;
191 p_vpar->pool.pf_new_mb = NewMacroblockPool;
192 p_vpar->pool.pf_free_mb = FreeMacroblockPool;
193 p_vpar->pool.pf_decode_mb = DecodeMacroblockPool;
197 /* No decoder pool. */
198 p_vpar->pool.pf_wait_pool = WaitDummy;
199 p_vpar->pool.pf_new_mb = NewMacroblockDummy;
200 p_vpar->pool.pf_free_mb = FreeMacroblockDummy;
201 p_vpar->pool.pf_decode_mb = DecodeMacroblockDummy;
205 /*****************************************************************************
206 * vpar_EndPool: Releases the pool structure
207 *****************************************************************************/
208 void vpar_EndPool( vpar_thread_t * p_vpar )
212 for( i = 0; i < 12; i++ )
214 free( p_vpar->pool.mb.p_idcts[i].pi_block_orig );
217 for( i = 0; i < p_vpar->pool.i_smp; i++ )
221 vlc_object_detach_all( p_vpar->pool.pp_vdec[i] );
222 vdec_DestroyThread( p_vpar->pool.pp_vdec[i] );
224 for( j = 0; j < 12; j++ )
226 free( p_vpar->pool.p_macroblocks[i].p_idcts[j].pi_block_orig );
230 if( p_vpar->pool.i_smp )
232 free( p_vpar->pool.pp_vdec );
233 free( p_vpar->pool.p_macroblocks );
234 free( p_vpar->pool.pp_new_macroblocks );
237 /* Free fake video decoder (used when parser == decoder). */
238 vlc_object_detach_all( p_vpar->pool.p_vdec );
239 vdec_EndThread( p_vpar->pool.p_vdec );
240 vlc_object_destroy( p_vpar->pool.p_vdec );
242 /* Destroy lock and cond. */
243 vlc_mutex_destroy( &p_vpar->pool.lock );
244 vlc_cond_destroy( &p_vpar->pool.wait_empty );
245 vlc_cond_destroy( &p_vpar->pool.wait_undecoded );
248 /*****************************************************************************
249 * WaitPool: Wait until all decoders are idle
250 *****************************************************************************/
251 static void WaitPool( vdec_pool_t * p_pool )
253 vlc_mutex_lock( &p_pool->lock );
254 while( p_pool->i_index_empty != p_pool->i_smp )
256 vlc_cond_wait( &p_pool->wait_empty, &p_pool->lock );
258 vlc_mutex_unlock( &p_pool->lock );
261 /*****************************************************************************
262 * WaitDummy: Placeholder used when parser == decoder
263 *****************************************************************************/
264 static void WaitDummy( vdec_pool_t * p_pool )
268 /*****************************************************************************
269 * NewMacroblockPool: Get an empty macroblock from the decoder pool
270 *****************************************************************************/
271 static macroblock_t * NewMacroblockPool( vdec_pool_t * p_pool )
275 vlc_mutex_lock( &p_pool->lock );
276 while( p_pool->i_index_empty == 0 )
278 vlc_cond_wait( &p_pool->wait_empty, &p_pool->lock );
280 p_mb = p_pool->pp_empty_macroblocks[ --p_pool->i_index_empty ];
281 vlc_mutex_unlock( &p_pool->lock );
285 /*****************************************************************************
286 * NewMacroblockDummy: Placeholder used when parser == decoder
287 *****************************************************************************/
288 static macroblock_t * NewMacroblockDummy( vdec_pool_t * p_pool )
290 return( &p_pool->mb );
293 /*****************************************************************************
294 * FreeMacroblockPool: Free a macroblock
295 *****************************************************************************/
296 static void FreeMacroblockPool( vdec_pool_t * p_pool, macroblock_t * p_mb )
298 vlc_mutex_lock( &p_pool->lock );
299 p_pool->pp_empty_macroblocks[ p_pool->i_index_empty++ ] = p_mb;
300 vlc_cond_signal( &p_pool->wait_empty );
301 vlc_mutex_unlock( &p_pool->lock );
304 /*****************************************************************************
305 * FreeMacroblockDummy: Placeholder used when parser == decoder
306 *****************************************************************************/
307 static void FreeMacroblockDummy( vdec_pool_t * p_pool, macroblock_t * p_mb )
311 /*****************************************************************************
312 * DecodeMacroblockPool: Send a macroblock to a vdec thread
313 *****************************************************************************/
314 static void DecodeMacroblockPool( vdec_pool_t * p_pool, macroblock_t * p_mb )
316 vlc_mutex_lock( &p_pool->lock );
317 /* The undecoded macroblock LIFO cannot be full, because
318 * #macroblocks == size of the LIFO */
319 p_pool->pp_new_macroblocks[ p_pool->i_index_new++ ] = p_mb;
320 vlc_cond_signal( &p_pool->wait_undecoded );
321 vlc_mutex_unlock( &p_pool->lock );
324 /*****************************************************************************
325 * DecodeMacroblockDummy: Placeholder used when parser == decoder
326 *****************************************************************************/
327 static void DecodeMacroblockDummy( vdec_pool_t * p_pool, macroblock_t * p_mb )
329 p_pool->pf_vdec_decode( p_pool->p_vdec, p_mb );