[Ffmpeg-devel] Problem with returned AVCodecContext

[Ahmad Zaidee bin Abu]

Hi all,

I'm quite beginner with ffmpeg. I have some problems with AVCodecContext.

I'm using C++ .Net with libavcodec/libavformat CVS 09/29/05.

In main() i do

//FFMPEG Initialization

// Register all formats and codecs

av_register_all();

avcodec_init();

avcodec_register_all();

(have to do avcodec_init & avcodec_register_all, otherwise codec not found)

AVCodecContext *CodecContext; //=NULL;

AVFrame *Picture;

CreateH263Decoder(CodecContext, Picture);

...

I used 3 functions as below:

int CreateH263Decoder(AVCodecContext *c, AVFrame *picture)

{

AVCodec *codec; 

/* find the h263 video decoder */

codec = avcodec_find_decoder(CODEC_ID_H263); 

if (!codec) {

// Codec NOT Found

return H263_NOT_FOUND; //my own error / success detection macro

}

c = avcodec_alloc_context();

picture= avcodec_alloc_frame();

if (!picture)

{

return H263_NO_MEMORY_FOR_BUFFERS; //my own error / success detection macro

}

/* open it */

if (avcodec_open(c, codec) < 0) {

//Open Failed!

return H263_OPEN_FAIL; //my own error / success detection macro

}

return H263_OK; // return ok if successful.

}

int DecodeH263(AVCodecContext *c, AVFrame *picture, unsigned char *videobuffer, int buffsize)

{

int got_picture, len;

len = avcodec_decode_video(c, picture, &got_picture, videobuffer, buffsize);

if (got_picture)

{

return H263_OK;

}

else

{

return H263_FRAMEDECOMPRESS_FAIL;

}

}

void DestroyH263Decoder(AVCodecContext *c, AVFrame *picture) {

//Close & free context and free picture (frame)

avcodec_close(c);

av_free(c);

av_free(picture);

}

When I call CreateH263Decoder, AVCodecContext reurn NULL (0). When i trace inside the function,

the value of "c" before return H263_OK;  are as expected, but value of "CodecContext" in main are not as I expected.

What could be the problem? Did I miss anything.

Thank you.

 


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