1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
|
/*
* Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
//#define DEBUG
#include "avcodec.h"
#include "thread.h"
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <process.h>
typedef struct ThreadContext{
AVCodecContext *avctx;
HANDLE thread;
HANDLE work_sem;
HANDLE job_sem;
HANDLE done_sem;
int (*func)(AVCodecContext *c, void *arg);
int (*func2)(AVCodecContext *c, void *arg, int, int);
void *arg;
int argsize;
int *jobnr;
int *ret;
int threadnr;
}ThreadContext;
static unsigned WINAPI attribute_align_arg thread_func(void *v){
ThreadContext *c= v;
for(;;){
int ret, jobnr;
//printf("thread_func %X enter wait\n", (int)v); fflush(stdout);
WaitForSingleObject(c->work_sem, INFINITE);
// avoid trying to access jobnr if we should quit
if (!c->func && !c->func2)
break;
WaitForSingleObject(c->job_sem, INFINITE);
jobnr = (*c->jobnr)++;
ReleaseSemaphore(c->job_sem, 1, 0);
//printf("thread_func %X after wait (func=%X)\n", (int)v, (int)c->func); fflush(stdout);
if(c->func)
ret= c->func(c->avctx, (uint8_t *)c->arg + jobnr*c->argsize);
else
ret= c->func2(c->avctx, c->arg, jobnr, c->threadnr);
if (c->ret)
c->ret[jobnr] = ret;
//printf("thread_func %X signal complete\n", (int)v); fflush(stdout);
ReleaseSemaphore(c->done_sem, 1, 0);
}
return 0;
}
/**
* Free what has been allocated by ff_thread_init().
* Must be called after decoding has finished, especially do not call while avcodec_thread_execute() is running.
*/
void ff_thread_free(AVCodecContext *s){
ThreadContext *c= s->thread_opaque;
int i;
for(i=0; i<s->thread_count; i++){
c[i].func= NULL;
c[i].func2= NULL;
}
ReleaseSemaphore(c[0].work_sem, s->thread_count, 0);
for(i=0; i<s->thread_count; i++){
WaitForSingleObject(c[i].thread, INFINITE);
if(c[i].thread) CloseHandle(c[i].thread);
}
if(c[0].work_sem) CloseHandle(c[0].work_sem);
if(c[0].job_sem) CloseHandle(c[0].job_sem);
if(c[0].done_sem) CloseHandle(c[0].done_sem);
av_freep(&s->thread_opaque);
}
static int avcodec_thread_execute(AVCodecContext *s, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size){
ThreadContext *c= s->thread_opaque;
int i;
int jobnr = 0;
assert(s == c->avctx);
/* note, we can be certain that this is not called with the same AVCodecContext by different threads at the same time */
for(i=0; i<s->thread_count; i++){
c[i].arg= arg;
c[i].argsize= size;
c[i].func= func;
c[i].ret= ret;
c[i].jobnr = &jobnr;
}
ReleaseSemaphore(c[0].work_sem, count, 0);
for(i=0; i<count; i++)
WaitForSingleObject(c[0].done_sem, INFINITE);
return 0;
}
static int avcodec_thread_execute2(AVCodecContext *s, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count){
ThreadContext *c= s->thread_opaque;
int i;
for(i=0; i<s->thread_count; i++)
c[i].func2 = func;
avcodec_thread_execute(s, NULL, arg, ret, count, 0);
}
int ff_thread_init(AVCodecContext *s){
int i;
ThreadContext *c;
uint32_t threadid;
if(!(s->thread_type & FF_THREAD_SLICE)){
av_log(s, AV_LOG_WARNING, "The requested thread algorithm is not supported with this thread library.\n");
return 0;
}
s->active_thread_type= FF_THREAD_SLICE;
if (thread_count <= 1)
return 0;
assert(!s->thread_opaque);
c= av_mallocz(sizeof(ThreadContext)*thread_count);
s->thread_opaque= c;
if(!(c[0].work_sem = CreateSemaphore(NULL, 0, INT_MAX, NULL)))
goto fail;
if(!(c[0].job_sem = CreateSemaphore(NULL, 1, 1, NULL)))
goto fail;
if(!(c[0].done_sem = CreateSemaphore(NULL, 0, INT_MAX, NULL)))
goto fail;
for(i=0; i<thread_count; i++){
//printf("init semaphors %d\n", i); fflush(stdout);
c[i].avctx= s;
c[i].work_sem = c[0].work_sem;
c[i].job_sem = c[0].job_sem;
c[i].done_sem = c[0].done_sem;
c[i].threadnr = i;
//printf("create thread %d\n", i); fflush(stdout);
c[i].thread = (HANDLE)_beginthreadex(NULL, 0, thread_func, &c[i], 0, &threadid );
if( !c[i].thread ) goto fail;
}
//printf("init done\n"); fflush(stdout);
s->execute= avcodec_thread_execute;
s->execute2= avcodec_thread_execute2;
return 0;
fail:
ff_thread_free(s);
return -1;
}
|
