ffmpeg / libavcodec / w32thread.c @ 5509bffa
History | View | Annotate | Download (3.79 KB)
1 |
/*
|
---|---|
2 |
* Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
|
3 |
*
|
4 |
* This library is free software; you can redistribute it and/or
|
5 |
* modify it under the terms of the GNU Lesser General Public
|
6 |
* License as published by the Free Software Foundation; either
|
7 |
* version 2 of the License, or (at your option) any later version.
|
8 |
*
|
9 |
* This library is distributed in the hope that it will be useful,
|
10 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
11 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
12 |
* Lesser General Public License for more details.
|
13 |
*
|
14 |
* You should have received a copy of the GNU Lesser General Public
|
15 |
* License along with this library; if not, write to the Free Software
|
16 |
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
17 |
*
|
18 |
*/
|
19 |
//#define DEBUG
|
20 |
|
21 |
#include "avcodec.h" |
22 |
#include "common.h" |
23 |
|
24 |
#define WIN32_LEAN_AND_MEAN
|
25 |
#include <windows.h> |
26 |
#include <process.h> |
27 |
|
28 |
typedef struct ThreadContext{ |
29 |
AVCodecContext *avctx; |
30 |
HANDLE thread; |
31 |
HANDLE work_sem; |
32 |
HANDLE done_sem; |
33 |
int (*func)(AVCodecContext *c, void *arg); |
34 |
void *arg;
|
35 |
int ret;
|
36 |
}ThreadContext; |
37 |
|
38 |
|
39 |
static unsigned __stdcall thread_func(void *v){ |
40 |
ThreadContext *c= v; |
41 |
|
42 |
for(;;){
|
43 |
//printf("thread_func %X enter wait\n", (int)v); fflush(stdout);
|
44 |
WaitForSingleObject(c->work_sem, INFINITE); |
45 |
//printf("thread_func %X after wait (func=%X)\n", (int)v, (int)c->func); fflush(stdout);
|
46 |
if(c->func)
|
47 |
c->ret= c->func(c->avctx, c->arg); |
48 |
else
|
49 |
return 0; |
50 |
//printf("thread_func %X signal complete\n", (int)v); fflush(stdout);
|
51 |
ReleaseSemaphore(c->done_sem, 1, 0); |
52 |
} |
53 |
|
54 |
return 0; |
55 |
} |
56 |
|
57 |
/**
|
58 |
* free what has been allocated by avcodec_thread_init().
|
59 |
* must be called after decoding has finished, especially dont call while avcodec_thread_execute() is running
|
60 |
*/
|
61 |
void avcodec_thread_free(AVCodecContext *s){
|
62 |
ThreadContext *c= s->thread_opaque; |
63 |
int i;
|
64 |
|
65 |
for(i=0; i<s->thread_count; i++){ |
66 |
|
67 |
c[i].func= NULL;
|
68 |
ReleaseSemaphore(c[i].work_sem, 1, 0); |
69 |
WaitForSingleObject(c[i].thread, INFINITE); |
70 |
if(c[i].work_sem) CloseHandle(c[i].work_sem);
|
71 |
if(c[i].done_sem) CloseHandle(c[i].done_sem);
|
72 |
} |
73 |
|
74 |
av_freep(&s->thread_opaque); |
75 |
} |
76 |
|
77 |
int avcodec_thread_execute(AVCodecContext *s, int (*func)(AVCodecContext *c2, void *arg2),void **arg, int *ret, int count){ |
78 |
ThreadContext *c= s->thread_opaque; |
79 |
int i;
|
80 |
|
81 |
assert(s == c->avctx); |
82 |
assert(count <= s->thread_count); |
83 |
|
84 |
/* note, we can be certain that this is not called with the same AVCodecContext by different threads at the same time */
|
85 |
|
86 |
for(i=0; i<count; i++){ |
87 |
c[i].arg= arg[i]; |
88 |
c[i].func= func; |
89 |
c[i].ret= 12345;
|
90 |
|
91 |
ReleaseSemaphore(c[i].work_sem, 1, 0); |
92 |
} |
93 |
for(i=0; i<count; i++){ |
94 |
WaitForSingleObject(c[i].done_sem, INFINITE); |
95 |
|
96 |
c[i].func= NULL;
|
97 |
if(ret) ret[i]= c[i].ret;
|
98 |
} |
99 |
return 0; |
100 |
} |
101 |
|
102 |
int avcodec_thread_init(AVCodecContext *s, int thread_count){ |
103 |
int i;
|
104 |
ThreadContext *c; |
105 |
uint32_t threadid; |
106 |
|
107 |
s->thread_count= thread_count; |
108 |
|
109 |
assert(!s->thread_opaque); |
110 |
c= av_mallocz(sizeof(ThreadContext)*thread_count);
|
111 |
s->thread_opaque= c; |
112 |
|
113 |
for(i=0; i<thread_count; i++){ |
114 |
//printf("init semaphors %d\n", i); fflush(stdout);
|
115 |
c[i].avctx= s; |
116 |
|
117 |
if(!(c[i].work_sem = CreateSemaphore(NULL, 0, s->thread_count, NULL))) |
118 |
goto fail;
|
119 |
if(!(c[i].done_sem = CreateSemaphore(NULL, 0, s->thread_count, NULL))) |
120 |
goto fail;
|
121 |
|
122 |
//printf("create thread %d\n", i); fflush(stdout);
|
123 |
c[i].thread = (HANDLE)_beginthreadex(NULL, 0, thread_func, &c[i], 0, &threadid ); |
124 |
if( !c[i].thread ) goto fail; |
125 |
} |
126 |
//printf("init done\n"); fflush(stdout);
|
127 |
|
128 |
s->execute= avcodec_thread_execute; |
129 |
|
130 |
return 0; |
131 |
fail:
|
132 |
avcodec_thread_free(s); |
133 |
return -1; |
134 |
} |