static int64_t dv_frame_offset(AVFormatContext *s, DVDemuxContext *c, int64_t timestamp, int flags) { // FIXME: sys may be wrong if last dv_read_packet() failed (buffer is junk) const AVDVProfile *sys = av_dv_codec_profile2(c->vst->codec->width, c->vst->codec->height, c->vst->codec->pix_fmt, c->vst->codec->time_base); int64_t offset; int64_t size = avio_size(s->pb) - s->internal->data_offset; int64_t max_offset = ((size - 1) / sys->frame_size) * sys->frame_size; offset = sys->frame_size * timestamp; if (size >= 0 && offset > max_offset) offset = max_offset; else if (offset < 0) offset = 0; return offset + s->internal->data_offset; }