1 /*****************************************************************************
2 * vpar_pool.c : management of the pool of decoder threads
3 *****************************************************************************
4 * Copyright (C) 2001 VideoLAN
5 * $Id: vpar_pool.c,v 1.6 2002/03/19 12:48:01 gbazin 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() */
30 #include <videolan/vlc.h>
33 #include "video_output.h"
35 #include "stream_control.h"
36 #include "input_ext-dec.h"
38 #include "vdec_ext-plugins.h"
39 #include "vpar_pool.h"
40 #include "video_parser.h"
41 #include "video_decoder.h"
46 static void WaitDummy( vdec_pool_t * p_pool );
47 static void WaitPool( vdec_pool_t * p_pool );
48 static void FreeMacroblockDummy( vdec_pool_t * p_pool, macroblock_t * p_mb );
49 static void FreeMacroblockPool( vdec_pool_t * p_pool, macroblock_t * p_mb );
50 static macroblock_t * NewMacroblockDummy( vdec_pool_t * p_pool );
51 static macroblock_t * NewMacroblockPool( vdec_pool_t * p_pool );
52 static void DecodeMacroblockDummy( vdec_pool_t * p_pool, macroblock_t * p_mb );
53 static void DecodeMacroblockPool( vdec_pool_t * p_pool, macroblock_t * p_mb );
55 /*****************************************************************************
56 * vpar_InitPool: Initializes the pool structure
57 *****************************************************************************/
58 void vpar_InitPool( vpar_thread_t * p_vpar )
62 /* Initialize mutex and cond. */
63 vlc_mutex_init( &p_vpar->pool.lock );
64 vlc_cond_init( &p_vpar->pool.wait_empty );
65 vlc_cond_init( &p_vpar->pool.wait_undecoded );
67 /* Spawn optional video decoder threads. */
68 p_vpar->pool.i_smp = 0;
69 p_vpar->pool.pp_vdec = NULL;
70 p_vpar->pool.p_macroblocks = NULL;
71 p_vpar->pool.pp_empty_macroblocks = NULL;
72 p_vpar->pool.pp_new_macroblocks = NULL;
73 p_vpar->pool.p_vpar = p_vpar;
74 vpar_SpawnPool( p_vpar );
76 /* Initialize fake video decoder structure (used when
77 * decoder == parser). */
78 if ( (p_vpar->pool.p_vdec =
79 (vdec_thread_t *)malloc( sizeof(vdec_thread_t) )) == NULL )
81 intf_ErrMsg("vdec error: not enough memory for vdec_CreateThread() to create the new thread");
82 p_vpar->p_fifo->b_error = 1;
85 p_vpar->pool.p_vdec->b_die = 0;
86 p_vpar->pool.p_vdec->p_pool = &p_vpar->pool;
87 vdec_InitThread( p_vpar->pool.p_vdec );
89 for( j = 0; j < 12; j++ )
91 p_vpar->pool.mb.p_idcts[j].pi_block =
92 memalign( 16, 64 * sizeof(dctelem_t) );
96 /*****************************************************************************
97 * vpar_SpawnPool: Create and cancel video decoder threads at any time
98 *****************************************************************************
99 * This function is called on startup, and everytime the user changes the
100 * number of threads to launch. Please note that *all* decoder threads must
101 * be idle during this operation, which only happens at the end of
103 *****************************************************************************/
104 void vpar_SpawnPool( vpar_thread_t * p_vpar )
107 stream_ctrl_t * p_control;
109 p_control = p_vpar->p_config->p_stream_ctrl;
110 vlc_mutex_lock( &p_control->control_lock );
111 i_new_smp = p_control->i_smp;
112 vlc_mutex_unlock( &p_control->control_lock );
114 /* FIXME: No error check because I'm tired. Come back later... */
116 /* No need to lock p_vpar->pool, since decoders MUST be idle here. */
117 if( p_vpar->pool.i_smp != i_new_smp )
121 if( p_vpar->pool.i_smp > i_new_smp )
123 /* The user reduces the number of threads. */
125 for( i = p_vpar->pool.i_smp - 1; i >= i_new_smp; 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 );
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 memalign( 16, 64 * sizeof(dctelem_t) );
173 p_vpar->pool.pp_vdec[i] = vdec_CreateThread( &p_vpar->pool );
177 for( i = 0; i < i_new_smp; i++ )
179 p_vpar->pool.pp_empty_macroblocks[i] =
180 &p_vpar->pool.p_macroblocks[i];
182 p_vpar->pool.i_smp = i_new_smp;
187 /* We have at least one decoder thread. */
188 p_vpar->pool.pf_wait_pool = WaitPool;
189 p_vpar->pool.pf_new_mb = NewMacroblockPool;
190 p_vpar->pool.pf_free_mb = FreeMacroblockPool;
191 p_vpar->pool.pf_decode_mb = DecodeMacroblockPool;
195 /* No decoder pool. */
196 p_vpar->pool.pf_wait_pool = WaitDummy;
197 p_vpar->pool.pf_new_mb = NewMacroblockDummy;
198 p_vpar->pool.pf_free_mb = FreeMacroblockDummy;
199 p_vpar->pool.pf_decode_mb = DecodeMacroblockDummy;
203 /*****************************************************************************
204 * vpar_EndPool: Releases the pool structure
205 *****************************************************************************/
206 void vpar_EndPool( vpar_thread_t * p_vpar )
210 for( i = 0; i < 12; i++ )
212 free( p_vpar->pool.mb.p_idcts[i].pi_block );
215 for( i = 0; i < p_vpar->pool.i_smp; i++ )
219 vdec_DestroyThread( p_vpar->pool.pp_vdec[i] );
221 for( j = 0; j < 12; j++ )
223 free( p_vpar->pool.p_macroblocks[i].p_idcts[j].pi_block );
227 if( p_vpar->pool.i_smp )
229 free( p_vpar->pool.pp_vdec );
230 free( p_vpar->pool.p_macroblocks );
231 free( p_vpar->pool.pp_new_macroblocks );
234 /* Free fake video decoder (used when parser == decoder). */
235 vdec_EndThread( p_vpar->pool.p_vdec );
237 /* Destroy lock and cond. */
238 vlc_mutex_destroy( &p_vpar->pool.lock );
239 vlc_cond_destroy( &p_vpar->pool.wait_empty );
240 vlc_cond_destroy( &p_vpar->pool.wait_undecoded );
243 /*****************************************************************************
244 * WaitPool: Wait until all decoders are idle
245 *****************************************************************************/
246 static void WaitPool( vdec_pool_t * p_pool )
248 vlc_mutex_lock( &p_pool->lock );
249 while( p_pool->i_index_empty != p_pool->i_smp )
251 vlc_cond_wait( &p_pool->wait_empty, &p_pool->lock );
253 vlc_mutex_unlock( &p_pool->lock );
256 /*****************************************************************************
257 * WaitDummy: Placeholder used when parser == decoder
258 *****************************************************************************/
259 static void WaitDummy( vdec_pool_t * p_pool )
263 /*****************************************************************************
264 * NewMacroblockPool: Get an empty macroblock from the decoder pool
265 *****************************************************************************/
266 static macroblock_t * NewMacroblockPool( vdec_pool_t * p_pool )
270 vlc_mutex_lock( &p_pool->lock );
271 while( p_pool->i_index_empty == 0 )
273 vlc_cond_wait( &p_pool->wait_empty, &p_pool->lock );
275 p_mb = p_pool->pp_empty_macroblocks[ --p_pool->i_index_empty ];
276 vlc_mutex_unlock( &p_pool->lock );
280 /*****************************************************************************
281 * NewMacroblockDummy: Placeholder used when parser == decoder
282 *****************************************************************************/
283 static macroblock_t * NewMacroblockDummy( vdec_pool_t * p_pool )
285 return( &p_pool->mb );
288 /*****************************************************************************
289 * FreeMacroblockPool: Free a macroblock
290 *****************************************************************************/
291 static void FreeMacroblockPool( vdec_pool_t * p_pool, macroblock_t * p_mb )
293 vlc_mutex_lock( &p_pool->lock );
294 p_pool->pp_empty_macroblocks[ p_pool->i_index_empty++ ] = p_mb;
295 vlc_cond_signal( &p_pool->wait_empty );
296 vlc_mutex_unlock( &p_pool->lock );
299 /*****************************************************************************
300 * FreeMacroblockDummy: Placeholder used when parser == decoder
301 *****************************************************************************/
302 static void FreeMacroblockDummy( vdec_pool_t * p_pool, macroblock_t * p_mb )
306 /*****************************************************************************
307 * DecodeMacroblockPool: Send a macroblock to a vdec thread
308 *****************************************************************************/
309 static void DecodeMacroblockPool( vdec_pool_t * p_pool, macroblock_t * p_mb )
311 vlc_mutex_lock( &p_pool->lock );
312 /* The undecoded macroblock LIFO cannot be full, because
313 * #macroblocks == size of the LIFO */
314 p_pool->pp_new_macroblocks[ p_pool->i_index_new++ ] = p_mb;
315 vlc_cond_signal( &p_pool->wait_undecoded );
316 vlc_mutex_unlock( &p_pool->lock );
319 /*****************************************************************************
320 * DecodeMacroblockDummy: Placeholder used when parser == decoder
321 *****************************************************************************/
322 static void DecodeMacroblockDummy( vdec_pool_t * p_pool, macroblock_t * p_mb )
324 p_pool->pf_vdec_decode( p_pool->p_vdec, p_mb );