/*
*build next skb from buffer cache
*/
char *prep_next_skb(file_cache_t *fct,u_int32_t *pktlen)
{
if (fct == NULL) {
printf("<1>no file buffer cache \n");return NULL;
}
/* if end */
if (fct->offset == fct->size)
fct->offset = sizeof(pf_hdr_t);
/*set packet data and hdr pointer,? no copy*/
p_hdr_t *hdr = (p_hdr_t*)(fct->fcache + fct->offset);
u_int32_t caplen = hdr->ncl_len;
FOFFSET(sizeof(p_hdr_t));
char *pktdata = fct->fcache + fct->offset;
FOFFSET(hdr->ncl_len);
if (fct->offset > fct->size) {
printf("<1>pcap file is not integrated\n");
return NULL;
}
*pktlen = caplen;
return pktdata;
}
int check_pcap(file_cache_t *fct)
{
u_int32_t magic;
memcpy(&magic, fct->fcache + fct->offset, sizeof(magic));
FOFFSET(sizeof(magic));
if (magic != TCPDUMP_MAGIC) {
printf("<1> not a tcpdump file\n");
return 0;
}
fct->hdr.magic = magic;
memcpy(&(fct->hdr)+sizeof(magic), fct->fcache+fct->offset, sizeof(fct->hdr)-sizeof(magic));
FOFFSET(sizeof(fct->hdr) - sizeof(magic));
if (fct->offset >= fct->size) {
printf("<1> not a complete pcap file\n");
return 0;
}
return 1;
}
dest->subtitle_header_size = 0;
dest->extradata_size = 0;
av_opt_free(dest);
return AVERROR(ENOMEM);
}
#endif
const AVClass *avcodec_get_class(void)
{
return &av_codec_context_class;
}
#define FOFFSET(x) offsetof(AVFrame,x)
static const AVOption frame_options[]={
{"best_effort_timestamp", "", FOFFSET(best_effort_timestamp), AV_OPT_TYPE_INT64, {.i64 = AV_NOPTS_VALUE }, INT64_MIN, INT64_MAX, 0},
{"pkt_pos", "", FOFFSET(pkt_pos), AV_OPT_TYPE_INT64, {.i64 = -1 }, INT64_MIN, INT64_MAX, 0},
{"pkt_size", "", FOFFSET(pkt_size), AV_OPT_TYPE_INT64, {.i64 = -1 }, INT64_MIN, INT64_MAX, 0},
{"sample_aspect_ratio", "", FOFFSET(sample_aspect_ratio), AV_OPT_TYPE_RATIONAL, {.dbl = 0 }, 0, INT_MAX, 0},
{"width", "", FOFFSET(width), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
{"height", "", FOFFSET(height), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
{"format", "", FOFFSET(format), AV_OPT_TYPE_INT, {.i64 = -1 }, 0, INT_MAX, 0},
{"channel_layout", "", FOFFSET(channel_layout), AV_OPT_TYPE_INT64, {.i64 = 0 }, 0, INT64_MAX, 0},
{"sample_rate", "", FOFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, 0},
{NULL},
};
static const AVClass av_frame_class = {
.class_name = "AVFrame",
.item_name = NULL,
.option = frame_options,