1/*
2 * Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20//#define DEBUG
21
22// Ported by Vlad Stelmahovsky
23
24#include "avcodec.h"
25
26#define INCL_DOS
27#define INCL_DOSERRORS
28#define INCL_DOSDEVIOCTL
29#include <os2.h>
30
31typedef struct ThreadContext{
32    AVCodecContext *avctx;
33    int thread;
34    HEV work_sem;
35    HEV done_sem;
36    int (*func)(AVCodecContext *c, void *arg);
37    void *arg;
38    int ret;
39}ThreadContext;
40
41
42static void attribute_align_arg thread_func(void *v){
43    ThreadContext *c= v;
44
45    for(;;){
46        //printf("thread_func %X enter wait\n", (int)v); fflush(stdout);
47        DosWaitEventSem(c->work_sem, SEM_INDEFINITE_WAIT);
48//        WaitForSingleObject(c->work_sem, INFINITE);
49//printf("thread_func %X after wait (func=%X)\n", (int)v, (int)c->func); fflush(stdout);
50        if(c->func)
51            c->ret= c->func(c->avctx, c->arg);
52        else
53            return;
54        //printf("thread_func %X signal complete\n", (int)v); fflush(stdout);
55        DosPostEventSem(c->done_sem);
56//        ReleaseSemaphore(c->done_sem, 1, 0);
57    }
58
59    return;
60}
61
62/**
63 * free what has been allocated by avcodec_thread_init().
64 * must be called after decoding has finished, especially do not call while avcodec_thread_execute() is running
65 */
66void avcodec_thread_free(AVCodecContext *s){
67    ThreadContext *c= s->thread_opaque;
68    int i;
69
70    for(i=0; i<s->thread_count; i++){
71
72        c[i].func= NULL;
73        DosPostEventSem(c[i].work_sem);
74        //        ReleaseSemaphore(c[i].work_sem, 1, 0);
75        DosWaitThread((PTID)&c[i].thread,DCWW_WAIT);
76//        WaitForSingleObject(c[i].thread, INFINITE);
77        if(c[i].work_sem) DosCloseEventSem(c[i].work_sem);//CloseHandle(c[i].work_sem);
78        if(c[i].done_sem) DosCloseEventSem(c[i].done_sem);//CloseHandle(c[i].done_sem);
79    }
80
81    av_freep(&s->thread_opaque);
82}
83
84static int avcodec_thread_execute(AVCodecContext *s, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size){
85    ThreadContext *c= s->thread_opaque;
86    int i;
87
88    assert(s == c->avctx);
89    assert(count <= s->thread_count);
90
91    /* note, we can be certain that this is not called with the same AVCodecContext by different threads at the same time */
92
93    for(i=0; i<count; i++){
94
95        c[i].arg= (char*)arg + i*size;
96        c[i].func= func;
97        c[i].ret= 12345;
98
99        DosPostEventSem(c[i].work_sem);
100//        ReleaseSemaphore(c[i].work_sem, 1, 0);
101    }
102    for(i=0; i<count; i++){
103        DosWaitEventSem(c[i].done_sem,SEM_INDEFINITE_WAIT);
104//        WaitForSingleObject(c[i].done_sem, INFINITE);
105
106        c[i].func= NULL;
107        if(ret) ret[i]= c[i].ret;
108    }
109    return 0;
110}
111
112int avcodec_thread_init(AVCodecContext *s, int thread_count){
113    int i;
114    ThreadContext *c;
115    uint32_t threadid;
116
117    s->thread_count= thread_count;
118
119    if (thread_count <= 1)
120        return 0;
121
122    assert(!s->thread_opaque);
123    c= av_mallocz(sizeof(ThreadContext)*thread_count);
124    s->thread_opaque= c;
125
126    for(i=0; i<thread_count; i++){
127//printf("init semaphors %d\n", i); fflush(stdout);
128        c[i].avctx= s;
129
130        if (DosCreateEventSem(NULL,&c[i].work_sem,DC_SEM_SHARED,0))
131            goto fail;
132        if (DosCreateEventSem(NULL,&c[i].done_sem,DC_SEM_SHARED,0))
133            goto fail;
134
135//printf("create thread %d\n", i); fflush(stdout);
136//        c[i].thread = (HANDLE)_beginthreadex(NULL, 0, thread_func, &c[i], 0, &threadid );
137        c[i].thread = _beginthread(thread_func, NULL, 0x10000, &c[i]);
138        if( c[i].thread <= 0 ) goto fail;
139    }
140//printf("init done\n"); fflush(stdout);
141
142    s->execute= avcodec_thread_execute;
143
144    return 0;
145fail:
146    avcodec_thread_free(s);
147    return -1;
148}
149