int n, sample_size, v;
int n;
static int adpcm_encode_frame(AVCodecContext *avctx,			    unsigned char *frame, int buf_size, void *data){    int n, sample_size, v;    short *samples;    unsigned char *dst;    switch(avctx->codec->id) {    default:        return -1;    }    avctx->key_frame = 1;    //avctx->frame_size = (dst - frame) / (sample_size * avctx->channels);    return dst - frame;}