c++ - how to put a raw char * to AVPacket -

i have compressed image stored in char * , want put avpacket can put ffmpeg decoder. can show how this? sample or tutorial appreciated.

thanks in advance

i show sample code related ffmpeg encoder.

static int encode_frame(avcodeccontext *avctx, avpacket *pkt,                         const avframe *pict, int *got_packet) {     unsigned char *buf;     int ret, buflen;     int64_t maxsize;      // store image data buf variable.     buf = ....     // calculate buf length.     buflen = ....      // allocate avpacket.     maxsize = ff_min_buffer_size + avctx->width * avctx->height * 9;     if ((ret = ff_alloc_packet2(avctx, pkt, maxsize)) < 0)         return ret;      // copy buf avpacket.     memcpy(pkt->data, buf, buflen);     pkt->size = buflen;      *got_packet = 1;      return 0; }