[Ffmpeg-devel] Re: How to convert a RGB buffer to AVFrame?

[Zinetz Victor]

Tran Huu Tri wrote:
> Hi,
> 
> I need to write the program that capture buffer from webcam
> in RGB format and use ffmpeg codecs library to convert to
> mpeg video file with the codecs as CODEC_ID_MPEG1VIDEO or
> CODEC_ID_H263,?
> 
>  
> 
> But I don?t know how to convert RGB buffer to AVFrame
> structure.
> 

delphi code:

const
   in_fmt: PIX_FMT_YUV420P;
var
   YUVframe, RGBframe, ENCframe: PAVFrame;
   YUVbuf,
   RGBbuf: pointer;
   size: integer;
   dwWidth, dwHeight: integer;

   codec_ctx: PAVCodecContext;
   codec: PAVCodec;

...

   YUVframe := avcodec_alloc_frame ();
   size := avpicture_get_size (in_fmt, dwWidth, dwHeight);
   YUVbuf := AllocMem (size);
   avpicture_fill (PAVPicture (YUVframe), YUVbuf, in_fmt, dwWidth, 
dwHeight);

   RGBframe := avcodec_alloc_frame ();
   size := avpicture_get_size (PIX_FMT_RGBA32, dwWidth, dwHeight);
   RGBbuf := AllocMem (size);
   avpicture_fill (PAVPicture (RGBframe), RGBbuf, PIX_FMT_RGBA32, 
dwWidth, dwHeight);

   codec_ctx := avcodec_alloc_context ();

   codec_ctx.codec_type := CODEC_TYPE_VIDEO;
   codec_ctx.codec_id := CODEC_ID_XVID;

   codec_ctx.bit_rate := 100000;
   codec_ctx.time_base.num := 25;
   codec_ctx.time_base.den := 1;
   codec_ctx.pix_fmt := in_fmt;

   codec := avcodec_find_encoder (codec_ctx.codec_id);
   avcodec_open (codec_ctx, codec);

...
getting data in RGBbuf
...

    img_convert (PAVPicture (YuvFrame), in_fmt,
                 PAVPicture (RgbFrame), PIX_FMT_RGBA32,
                 dwWidth, dwHeight);
    avcodec_encode_video (codec_ctx, EncodedBuf, 100000, YuvFrame);