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Python & c++ mixed call programming comprehensive practice -27 create xffmpeg classes and import ffmpeg related libraries

編輯：Python

author ： Empty bad uncle
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establish XFFmpeg Class import ffmpeg Correlation Library

One 、 add to open function

PyFFmpeg.h add to ：

 static PyObject* Open(PyFFmpeg*self, PyObject*args);

PyFFmpeg.cpp add to ：

#include "PyFFmpeg.h"
// Open to python
PyObject *PyFFmpeg::Create(PyTypeObject *type, PyObject *args, PyObject *kw) {

printf("PyFFmpeg::Create\n");
return type->tp_alloc(type, 0);
}
int PyFFmpeg::Init(PyFFmpeg*self, PyObject *args, PyObject *kw)
{

printf("PyFFmpeg::Init\n");
return 0;
}
void PyFFmpeg::Close(PyFFmpeg*self)
{

printf("PyFFmpeg::Close\n");
Py_TYPE(self)->tp_free(self);
}
PyObject* PyFFmpeg::Open(PyFFmpeg*self, PyObject*args)
{

const char *url = NULL;
if (!PyArg_ParseTuple(atgs, "s", &url))
return NULL;
printf("PyFFmpeg::Open %s\n", url);
Py_RETURN_TRUE;
}
// Module entry Module name pyffmpeg
PyMODINIT_FUNC PyInit_pyffmpeg(void)
{

PyObject *m = NULL;
static PyModuleDef ffmod = {

PyModuleDef_HEAD_INIT,
"pyffmpeg",
"", -1, 0
};
m = PyModule_Create(&ffmod);
// add to PyFFmpeg_python class 
static PyTypeObject type;
memset(&type, 0, sizeof(PyFFmpeg));
type.ob_base = {
 PyObject_HEAD_INIT(NULL) 0 };
type.tp_name = "";
type.tp_basicsize = sizeof(PyFFmpeg);
type.tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE;
type.tp_new = PyFFmpeg::Create;
type.tp_init = (initproc)PyFFmpeg::Init;
type.tp_dealloc = (destructor)PyFFmpeg::Close;
static PyMethodDef ffmeth[] = {

{
"open", (PyCFunction)PyFFmpeg::Open, METH_VARARGS, ""},
{
NULL}
}
type.tp_methods = ffmeth;
// Initialization type 
if (PyType_Ready(&type) < 0) {

return NULL;
}
PyModule_AddObject(m, "PyFFmpeg", (PyObject*)&type);
printf("Pyinit_pyffmpeg\n");
return m;
}

testmod.py Add call ：

ff = PyFFmpeg()
ff.open("video.mp4")
del ff

function ：

Two 、 Add the class XFFmpeg For encapsulation ffmpeg Call to

Add the class XFFmpeg

XFFmpeg.h The code is as follows ：

#pragma once
class XFFmpeg
{

public:
bool Open(const char *url);
XFFmpeg();
~XFFmpeg();
};

XFFmpeg.cpp The code is as follows ：

#include "XFFmpeg.h"
#include <stdio.h>
bool XFFmpeg::Open(const char *url)
{

printf("XFFmpeg::open %s\n", url);
return true;
}
XFFmpeg::XFFmpeg()
{

printf("Create XFFmpeg\n");
}
XFFmpeg::~XFFmpeg()
{

printf("Delete XFFmpeg\n");
}

PyFFmpeg.h The code is as follows ：

#pragma once
#include<Python.h>
class XFFmpeg;
class PyFFmpeg
{

public:
PyObject_HEAD
XFFmpeg *ff;
// Open to python Function of 
public:
static PyObject *Create(PyTypeObject *type, PyObject *args, PyObject *kw);
static int Init(PyFFmpeg*self, PyObject *args, PyObject *kw);
static void Close(PyFFmpeg*self);
static PyObject* Open(PyFFmpeg*self, PyObject*args);
};

PyFFmpeg.cpp The code is as follows ：

#include "PyFFmpeg.h"
#include "XFFmpeg.h"
// Open to python
PyObject *PyFFmpeg::Create(PyTypeObject *type, PyObject *args, PyObject *kw) {

printf("PyFFmpeg::Create\n");
PyFFmpeg*f = (PyFFmpeg*)type->tp_alloc(type, 0);
f->ff = new XFFmpeg();
return (PyObject *)f;
}
int PyFFmpeg::Init(PyFFmpeg*self, PyObject *args, PyObject *kw)
{

printf("PyFFmpeg::Init\n");
return 0;
}
void PyFFmpeg::Close(PyFFmpeg*self)
{

printf("PyFFmpeg::Close\n");
delete self->ff;
Py_TYPE(self)->tp_free(self);
}
PyObject* PyFFmpeg::Open(PyFFmpeg*self, PyObject*args)
{

const char *url = NULL;
if (!PyArg_ParseTuple(args, "s", &url))
return NULL;
printf("PyFFmpeg::Open %s\n", url);
if (self->ff->Open(url))
Py_RETURN_TRUE;
Py_RETURN_FALSE;
}
// Module entry Module name pyffmpeg
PyMODINIT_FUNC PyInit_pyffmpeg(void)
{

PyObject *m = NULL;
static PyModuleDef ffmod = {

PyModuleDef_HEAD_INIT,
"pyffmpeg",
"", -1, 0
};
m = PyModule_Create(&ffmod);
// add to PyFFmpeg_python class 
static PyTypeObject type;
memset(&type, 0, sizeof(PyFFmpeg));
type.ob_base = {
 PyObject_HEAD_INIT(NULL) 0 };
type.tp_name = "";
type.tp_basicsize = sizeof(PyFFmpeg);
type.tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE;
type.tp_new = PyFFmpeg::Create;
type.tp_init = (initproc)PyFFmpeg::Init;
type.tp_dealloc = (destructor)PyFFmpeg::Close;
static PyMethodDef ffmeth[] = {

{
 "open", (PyCFunction)PyFFmpeg::Open, METH_VARARGS, "" },
{
 NULL }
};
type.tp_methods = ffmeth;
// Initialization type 
if (PyType_Ready(&type) < 0) {

return NULL;
}
PyModule_AddObject(m, "PyFFmpeg", (PyObject*)&type);
printf("Pyinit_pyffmpeg\n");
return m;
}

3、 ... and 、 introduce ffmpeg Library to project

Download the file for class

Copy include、 lib Catalog ：

lib Library chairs only copy 32 position ：

Direct copy dll To project directory ：

Additional include directory add .\include

Additional Library Directory ：

Add additional dependent libraries avformat.lib

avformat.lib
avutil.lib
avcodec.lib

Open the video decapsulation

xxFFmpeg.h as follows ：

#pragma once
struct AVFormatContext;
class XFFmpeg
{

public:
bool Open(const char *url);
XFFmpeg();
~XFFmpeg();
protected:
AVFormatContext *ic = 0;
};

xFFmpeg.cpp as follows

#include "XFFmpeg.h"
#include <stdio.h>
extern "C" {
#include "libavformat\avformat.h"
}
bool XFFmpeg::Open(const char *url)
{
printf("XFFmpeg::open %s\n", url);
// Open the video decapsulation
int re =avformat_open_input(&ic, url, 0, 0);
if (re != 0)
{
char buf[1024] = { 0 };
av_strerror(re, buf, 1023);
printf("avformat open fail", buf);
return false;
}
return true;
}
XFFmpeg::XFFmpeg()
{
printf("Create XFFmpeg\n");
}
XFFmpeg::~XFFmpeg()
{
printf("Delete XFFmpeg\n");
}

Compiler error ：

Need to adjust ： senior -》 The image has a secure exception handler

function ：

Prompt no files

take video.mp4 Put it in , The next lesson will be played normally .

Four 、 summary

This article uses to create XFFmpeg Class import ffmpeg Related libraries into the project .
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