[FFmpeg-devel] question for ff_extract_extradata_bsf

[Yufei He]

Hi

I want to use   ff_extract_extradata_bsf to get extradata from a h.264 frame.

Here is the code.

AVPacket *avpkt; // There is valid data.
AVBSFContext *ctx = NULL;
ret = av_bsf_alloc(&ff_extract_extradata_bsf, &ctx);
ret = ff_extract_extradata_bsf.init(ctx);
ret = ff_extract_extradata_bsf.filter(ctx, avpkt);

ff_extract_extradata_bsf.filter failed on calling ff_bsf_get_packet_ref because  ctx->internal->buffer_pkt->data is NULL.

int ff_bsf_get_packet_ref(AVBSFContext *ctx, AVPacket *pkt)
{
AVBSFInternal *in = ctx->internal;
if (in->eof)
return AVERROR_EOF;
if (!ctx->internal->buffer_pkt->data &&
!ctx->internal->buffer_pkt->side_data_elems)
return AVERROR(EAGAIN);

...
}


How should ctx->internal->buffer+pkt->data be set?

Thanks.

Yufei.