C / C++ / MFC

Cedric Moonen wrote:
And what are you trying to do here ? You are casting a function pointer into a pointer of type AVCodecContext*. That's logical that you will have some problems. You try to get a return from the function ? Then you need to put the exact function prototype in the typedef (with the return and the arguments of the function). Then, you can simply call it like another function and get the returned value.

RahulOP wrote:

AVCodecContext is defined in avcodec.h as struct.

typedef void (avcodec_alloc_context)();

typedef AVCodecContext* (avcodec_alloc_context)();

AVCodecContext *avctx = p4(); 

RahulOP wrote:

gave me a lot of linker errors LNK 2019 and LNK2001

VuNic wrote:

I think he's shooting in the dark!

AVCodec *codec;<br />
    AVCodecContext *c= NULL;<br />
    int frame_size, i, j, out_size, outbuf_size;<br />
    FILE *f;<br />
    short *samples;<br />
    float t, tincr;<br />
    uint8_t *outbuf;<br />
    /* find the MP2 encoder */<br />
    codec = avcodec_find_encoder(CODEC_ID_MP2);<br />
    c= avcodec_alloc_context();<br />
        /* put sample parameters */<br />
    c->bit_rate = 64000;<br />
    c->sample_rate = 44100;<br />
    c->channels = 2;

RahulOP wrote:

Would you mind giving me your e-mail address?

AVCodec *codec;<br />
 int i, out_size, size, x, y, outbuf_size;<br />
    FILE *f;    <br />
    uint8_t *outbuf, *picture_buf;<br />
<br />
<br />
HMODULE hDll3 = LoadLibrary("avcodec.dll");<br />
typedef void (avcodec_find_encoder)(int CODECID);<br />
avcodec_find_encoder* p3 = (avcodec_find_encoder*)GetProcAddress(hDll3, "avcodec_find_encoder");<br />
if(p3==NULL)<br />
AfxMessageBox("Failed loading3");<br />
p3(CODEC_ID_MPEG1VIDEO);<br />
if(p3==NULL)<br />
AfxMessageBox("Failed loading3");<br />
<br />
<br />
codec=(AVCodec *)p3;<br />
<br />
HMODULE hDll4 = LoadLibrary("avcodec.dll");<br />
//(hDll should not be NULL here)<br />
typedef AVCodecContext* (avcodec_alloc_context)();<br />
avcodec_alloc_context* p4 = (avcodec_alloc_context*)GetProcAddress(hDll4, "avcodec_alloc_context");<br />
if(p4==NULL)<br />
AfxMessageBox("Failed loading4");<br />
p4();<br />
if(p4==NULL)<br />
AfxMessageBox("Failed loading4");<br />
<br />
AVCodecContext *avctx = p4();<br />
<br />
    avctx->bit_rate=400000;<br />
    avctx->width = 352;  <br />
    avctx->height = 288;<br />
    /* frames per second */<br />
    avctx->frame_rate = 25;  <br />
    avctx->frame_rate_base= 1;<br />
    avctx->gop_size = 10; /* emit one intra frame every ten frames */<br />
    avctx->max_b_frames=1;<br />
<br />
HMODULE hDll2 = LoadLibrary("avcodec.dll");<br />
//(hDll should not be NULL here)<br />
typedef int (avcodec_open)(AVCodecContext *avctx, AVCodec *codec);<br />
avcodec_open* p2 = (avcodec_open*)GetProcAddress(hDll2, "avcodec_open");<br />
if(p2==NULL)<br />
AfxMessageBox("Failed loading2");<br />
p2((AVCodecContext *)p4,(AVCodec*)p3);<br />

codec=(AVCodec *)p3

HMODULE hDll3 = LoadLibrary("avcodec.dll");
typedef (AVCode*)(avcodec_find_encoder)(int CODECID);
avcodec_find_encoder* p3 = (avcodec_find_encoder*)GetProcAddress(hDll3, "avcodec_find_encoder");
if(p3==NULL)
AfxMessageBox("Failed loading3");
p3(CODEC_ID_MPEG1VIDEO);
if(p3==NULL)
AfxMessageBox("Failed loading3");

// Call the function and get the result:
AVCodec* codec = p3(...);

RahulOP wrote:

p2((AVCodecContext *)p4,(AVCodec*)p3);

AVCodecContext* pContext = p4();
AVCoded* pCoded = p3(...);    // Don't forget to pass a parameter

// You can modify pContext and pCodec before passing them to p2, of course

p2(pContext,pCoded);

RahulOP wrote:

avctx=(AVCodecContext *)p4;

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