static int adx_decode_header(AVCodecContext *avctx, const uint8_t *buf, int bufsize) { int offset; if (buf[0] != 0x80) return 0; offset = (AV_RB32(buf) ^ 0x80000000) + 4; if (bufsize < offset || memcmp(buf + offset - 6, "(c)CRI", 6)) return 0; avctx->channels = buf[7]; avctx->sample_rate = AV_RB32(buf + 8); avctx->bit_rate = avctx->sample_rate * avctx->channels * 18 * 8 / 32; return offset; }