author ： Empty bad uncle
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adopt ffmpeg Total time of reading video
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:%s\n", buf);
return false;
}
// Get stream
avformat_find_stream_info(ic, 0);
// Total duration of video acquisition
int totalms = ic->duration / (AV_TIME_BASE / 1000);
printf("Total Ms =%d\n", totalms);
return true;
}
function ：
XFFmpeg.h Add member variables totalms
#pragma once
struct AVFormatContext;
class XFFmpeg
{
public:
bool Open(const char *url);
XFFmpeg();
~XFFmpeg();
int totalms = 0;
protected:
AVFormatContext *ic = 0;
};
XFFmpeg.cpp Add setting member variables
#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:%s\n", buf);
return false;
}
// Get stream
avformat_find_stream_info(ic, 0);
// Total duration of video acquisition
this->totalms = ic->duration / (AV_TIME_BASE / 1000);
printf("Total Ms =%d\n", totalms);
return true;
}
XFFmpeg::XFFmpeg()
{
printf("Create XFFmpeg\n");
}
XFFmpeg::~XFFmpeg()
{
printf("Delete XFFmpeg\n");
}
PyFFmpeg.h add to GetTotalms function
#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);
// Property function get
static PyObject* GetTotalms(PyFFmpeg*self, void*closure);
};
PyFFmpeg.cpp Add implementation and registration
#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;
}
PyObject* PyFFmpeg::GetTotalms(PyFFmpeg*self, void*closure) {
return PyLong_FromLong(self->ff->totalms);
}
// 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;
static PyGetSetDef sets[] = {
{
"totalms", (getter)PyFFmpeg::GetTotalms, 0, 0,0 },
{
NULL }
};
type.tp_getset = sets;
// Initialization type
if (PyType_Ready(&type) < 0) {
return NULL;
}
PyModule_AddObject(m, "PyFFmpeg", (PyObject*)&type);
printf("Pyinit_pyffmpeg\n");
return m;
}
testmod.py Add a call to the extension library interface
# import pyffmpeg
from pyffmpeg import *
ff = PyFFmpeg()
ff.open("video.mp4")
print("in Python totalms = ", ff.totalms)
del ff
input()
You can see success in python Read in the .
In this paper, complete python Call the extension library to read video information .
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